/* ==========================================================================
   BEGINTHINGS OS — 2026 GROUND-UP DESIGN SYSTEM
   Benchmark: thelist.design · arcteryx.com/system0 · grids.obys.agency · linear.app
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=JetBrains+Mono:wght@400;500;600&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

/* CSS Custom Properties & Liquid Glass Conic Rotation */
@property --liquid-angle {
  syntax: '<angle>';
  initial-value: 0deg;
  inherits: false;
}

:root {
  /* Chromatic Palette */
  --bt-canvas: #07080b;
  --bt-canvas-alt: #0b0d13;
  --bt-surface: rgba(16, 20, 29, 0.72);
  --bt-surface-solid: #10141d;
  --bt-surface-hover: rgba(26, 32, 46, 0.85);
  --bt-surface-elevated: rgba(22, 28, 41, 0.88);
  
  /* Hairline Borders */
  --bt-border: rgba(255, 255, 255, 0.08);
  --bt-border-subtle: rgba(255, 255, 255, 0.04);
  --bt-border-bright: rgba(255, 255, 255, 0.16);
  --bt-border-accent: rgba(99, 102, 241, 0.35);

  /* Typography Colors */
  --bt-text-primary: #f8fafc;
  --bt-text-secondary: #cbd5e1;
  --bt-text-muted: #64748b;
  --bt-text-dim: #475569;

  /* Signal Accents */
  --bt-accent-blue: #3b82f6;
  --bt-accent-indigo: #6366f1;
  --bt-accent-violet: #8b5cf6;
  --bt-accent-cyan: #06b6d4;
  --bt-accent-emerald: #10b981;
  --bt-accent-amber: #f59e0b;
  --bt-accent-rose: #f43f5e;

  /* Typography Scales */
  --bt-font-display: 'Instrument Serif', Georgia, serif;
  --bt-font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --bt-font-mono: 'JetBrains Mono', monospace;

  /* Layout Constants */
  --bt-max-width: 1360px;
  --bt-header-h: 72px;
  --bt-radius-sm: 8px;
  --bt-radius-md: 14px;
  --bt-radius-lg: 20px;
  --bt-radius-xl: 28px;
}

/* Global Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--bt-font-sans);
  background-color: var(--bt-canvas);
  color: var(--bt-text-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  overflow-x: hidden;
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
.bt-skip-link {
  position: absolute;
  top: -100px;
  left: 1.5rem;
  background: var(--bt-accent-blue);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 10000;
  border-radius: var(--bt-radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  transition: top 0.2s ease;
  text-decoration: none;
}
.bt-skip-link:focus {
  top: 1rem;
}

/* Background Atmosphere & Grid Texture */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 50% -10%, rgba(99, 102, 241, 0.12) 0%, transparent 60%),
    radial-gradient(circle at 10% 40%, rgba(6, 182, 212, 0.05) 0%, transparent 45%),
    radial-gradient(circle at 90% 70%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  pointer-events: none;
  z-index: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

:focus-visible {
  outline: 2px solid var(--bt-accent-blue);
  outline-offset: 2px;
}

/* Layout Utilities */
.bt-container {
  width: 100%;
  max-width: var(--bt-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1.25rem, 4vw, 2.5rem);
  padding-right: clamp(1.25rem, 4vw, 2.5rem);
  position: relative;
  z-index: 1;
}

.bt-section {
  padding-top: clamp(3.5rem, 6vw, 5rem);
  padding-bottom: clamp(3.5rem, 6vw, 5rem);
  position: relative;
  z-index: 1;
}

.bt-section-border-top {
  border-top: 1px solid var(--bt-border-subtle);
}

/* ==========================================================================
   LIQUID GLASS ENGINE (Conic Glow & Ambient Halo)
   ========================================================================== */
@keyframes liquidRotate {
  0% { --liquid-angle: 0deg; }
  100% { --liquid-angle: 360deg; }
}

.bt-liquid-glass {
  position: relative;
  background: var(--bt-surface);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-radius: var(--bt-radius-lg);
  border: 1px solid var(--bt-border);
  box-shadow: 
    0 10px 30px -10px rgba(0, 0, 0, 0.6),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}

.bt-liquid-glass-glow {
  position: relative;
  background: var(--bt-surface-elevated);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-radius: var(--bt-radius-lg);
  z-index: 1;
}

.bt-liquid-glass-glow::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: calc(var(--bt-radius-lg) + 2px);
  padding: 2px;
  background: conic-gradient(
    from var(--liquid-angle),
    #3b82f6,
    #8b5cf6 25%,
    #f43f5e 50%,
    #f59e0b 75%,
    #3b82f6 100%
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: liquidRotate 2.4s linear infinite;
  pointer-events: none;
  z-index: -1;
  opacity: 0.85;
}

.bt-liquid-glass-glow::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: calc(var(--bt-radius-lg) + 4px);
  background: conic-gradient(
    from var(--liquid-angle),
    #3b82f6,
    #8b5cf6 25%,
    #f43f5e 50%,
    #f59e0b 75%,
    #3b82f6 100%
  );
  filter: blur(28px);
  animation: liquidRotate 2.4s linear infinite;
  pointer-events: none;
  z-index: -2;
  opacity: 0.35;
}

/* ==========================================================================
   NAVIGATION CONTROL DOCK
   ========================================================================== */
.bt-header-dock,
.bt-nav-dock {
  position: fixed;
  top: 1rem;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  justify-content: center;
  padding: 0 1rem;
  pointer-events: none;
}

.bt-header-inner,
.bt-nav-inner {
  pointer-events: auto;
  width: 100%;
  max-width: var(--bt-max-width);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 1.25rem;
  background: rgba(10, 14, 23, 0.82);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 9999px;
  box-shadow: 
    0 20px 40px -15px rgba(0, 0, 0, 0.7),
    0 0 0 1px rgba(255, 255, 255, 0.05);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.bt-logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--bt-text-primary);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.bt-logo-link:hover .bt-logo-svg {
  transform: scale(1.06);
}

.bt-logo-svg {
  transition: transform 0.2s ease;
}

.bt-brand-text {
  font-weight: 700;
  font-size: 1.05rem;
  color: #fff;
  letter-spacing: -0.02em;
}

.bt-nav-menu,
.bt-nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.bt-nav-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.bt-btn-pill-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 1rem;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  color: #fff;
  font-weight: 600;
  font-size: 0.82rem;
  border-radius: 9999px;
  text-decoration: none;
  border: 1px solid rgba(96, 165, 250, 0.4);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
  transition: all 0.2s ease;
}

.bt-btn-pill-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
  border-color: rgba(96, 165, 250, 0.8);
}

@media (max-width: 960px) {
  .bt-nav-menu {
    display: none !important;
  }
  .bt-header-inner {
    padding: 0.45rem 1rem;
  }
}

@media (max-width: 640px) {
  .bt-header-dock {
    top: 0.6rem;
    padding: 0 0.6rem;
  }
  .bt-header-inner {
    padding: 0.35rem 0.8rem;
  }
  .bt-logo-link {
    gap: 0.5rem;
  }
  .bt-logo-svg {
    width: 28px;
    height: 28px;
  }
  .bt-brand-text {
    font-size: 0.92rem;
  }
  .bt-nav-actions #headerEnquireBtn,
  .bt-nav-actions .bt-enquiry-trigger {
    display: none !important;
  }
  .bt-btn-pill-cta {
    padding: 0.35rem 0.75rem;
    font-size: 0.76rem;
  }
}

.bt-nav-inner {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.5vw, 1.5rem);
  padding: 0.6rem 0.8rem 0.6rem 1.2rem;
  background: rgba(11, 14, 21, 0.78);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--bt-border-bright);
  border-radius: 9999px;
  box-shadow: 
    0 20px 40px -15px rgba(0, 0, 0, 0.7),
    0 0 0 1px rgba(255, 255, 255, 0.05);
}

.bt-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--bt-text-primary);
}

.bt-brand-logo {
  width: 30px;
  height: 30px;
  object-fit: contain;
  display: block;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), filter 0.25s ease;
}

.bt-brand:hover .bt-brand-logo {
  transform: scale(1.08);
}

.bt-brand-symbol {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--bt-accent-blue), var(--bt-accent-violet));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--bt-font-mono);
  font-size: 0.75rem;
  font-weight: 800;
  color: #fff;
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.4);
}

.bt-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: 9999px;
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  color: #34d399;
}

.bt-pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 8px #34d399;
  animation: pulseDot 2s ease-in-out infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.bt-nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.bt-nav-link {
  padding: 0.4rem 0.75rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--bt-text-secondary);
  border-radius: 9999px;
  transition: all 0.2s ease;
}

.bt-nav-link:hover {
  color: var(--bt-text-primary);
  background: rgba(255, 255, 255, 0.06);
}

/* 432Hz Synthesizer Toggle in Nav */
.bt-audio-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.75rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--bt-border);
  border-radius: 9999px;
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  color: var(--bt-text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.bt-audio-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--bt-border-bright);
}

.bt-audio-toggle.active {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.4);
  color: #c7d2fe;
}

.bt-audio-bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 12px;
}

.bt-audio-bars span {
  width: 2px;
  height: 4px;
  background: currentColor;
  border-radius: 1px;
}

.bt-audio-toggle.active .bt-audio-bars span:nth-child(1) { animation: barDance 0.8s ease-in-out infinite alternate; }
.bt-audio-toggle.active .bt-audio-bars span:nth-child(2) { animation: barDance 1.1s ease-in-out infinite alternate 0.2s; }
.bt-audio-toggle.active .bt-audio-bars span:nth-child(3) { animation: barDance 0.9s ease-in-out infinite alternate 0.4s; }

@keyframes barDance {
  0% { height: 3px; }
  100% { height: 12px; }
}

.bt-nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 1rem;
  background: #ffffff;
  color: #07080b;
  font-weight: 600;
  font-size: 0.82rem;
  border-radius: 9999px;
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.bt-nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(255, 255, 255, 0.35);
}

/* ==========================================================================
   ACT 1: THE HERO ANCHOR
   ========================================================================== */
.bt-hero {
  padding-top: calc(var(--bt-header-h) + clamp(3rem, 6vw, 5rem));
  padding-bottom: clamp(4rem, 8vw, 6rem);
  position: relative;
  overflow: hidden;
}

.bt-hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: center;
}

.bt-hero-eyebrow-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0.85rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--bt-border-bright);
  border-radius: 9999px;
  margin-bottom: 1.5rem;
}

.bt-hero-tag {
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: #94a3b8;
  text-transform: uppercase;
}

.bt-hero-tag-accent {
  color: #38bdf8;
  font-weight: 700;
}

.bt-hero-headline {
  font-size: clamp(2.75rem, 5.5vw, 4.75rem);
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: -0.035em;
  color: var(--bt-text-primary);
  margin-bottom: 1.5rem;
}

.bt-hero-headline-italic {
  font-family: var(--bt-font-display);
  font-style: italic;
  font-weight: 400;
  color: #e2e8f0;
  display: block;
}

.bt-hero-headline-highlight {
  background: linear-gradient(135deg, #60a5fa, #c084fc 50%, #f472b6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.bt-hero-desc {
  font-size: clamp(1rem, 1.3vw, 1.2rem);
  line-height: 1.65;
  color: var(--bt-text-secondary);
  max-width: 580px;
  margin-bottom: 2rem;
}

/* Command Bar (Raycast Style) */
.bt-command-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.8rem 0.6rem 1.1rem;
  background: rgba(16, 20, 29, 0.85);
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  margin-bottom: 1.5rem;
  max-width: 540px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.bt-command-bar:focus-within {
  border-color: var(--bt-accent-blue);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2), 0 12px 30px rgba(0, 0, 0, 0.5);
}

.bt-command-icon {
  color: var(--bt-text-muted);
  flex-shrink: 0;
}

.bt-command-input {
  width: 100%;
  color: var(--bt-text-primary);
  font-size: 0.92rem;
  font-weight: 500;
}

.bt-command-input::placeholder {
  color: var(--bt-text-muted);
}

.bt-command-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 4px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 4px;
  font-family: var(--bt-font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--bt-text-muted);
}

/* Quick Tool Filter Chips */
.bt-hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.bt-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--bt-border);
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--bt-text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.bt-chip:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--bt-border-bright);
  color: var(--bt-text-primary);
  transform: translateY(-1px);
}

.bt-chip-accent {
  background: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.3);
  color: #93c5fd;
}

/* Dual Primary Action Buttons */
.bt-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.bt-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.65rem;
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--bt-radius-md);
  box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.5);
  cursor: pointer;
  transition: all 0.25s ease;
}

.bt-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px -5px rgba(59, 130, 246, 0.65);
}

.bt-btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.65rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--bt-border-bright);
  color: var(--bt-text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--bt-radius-md);
  cursor: pointer;
  transition: all 0.25s ease;
}

.bt-btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

/* Hero Trust Strip */
.bt-hero-trust {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.82rem;
  color: var(--bt-text-muted);
}

.bt-hero-trust span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.bt-hero-trust svg {
  color: var(--bt-accent-emerald);
}

/* Hero Right Stage: 3D Workstation Preview Viewport */
.bt-hero-stage-wrap {
  position: relative;
}

.bt-workstation-viewport {
  position: relative;
  background: #090c13;
  border-radius: var(--bt-radius-xl);
  border: 1px solid var(--bt-border-bright);
  overflow: hidden;
  box-shadow: 
    0 25px 50px -12px rgba(0, 0, 0, 0.8),
    0 0 0 1px rgba(255, 255, 255, 0.05);
}

.bt-stage-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: rgba(16, 20, 29, 0.9);
  border-bottom: 1px solid var(--bt-border);
}

.bt-window-controls {
  display: flex;
  gap: 6px;
}

.bt-window-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.bt-dot-red { background: #ef4444; }
.bt-dot-yellow { background: #f59e0b; }
.bt-dot-green { background: #10b981; }

.bt-stage-title {
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--bt-text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.bt-stage-canvas-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: #07090e;
  overflow: hidden;
}

.bt-stage-canvas-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.bt-workstation-viewport:hover .bt-stage-canvas-wrap img {
  transform: scale(1.03);
}

/* Floating HUD telemetry tags */
.bt-stage-hud {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 2;
}

.bt-hud-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.65rem;
  background: rgba(11, 14, 21, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-sm);
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  color: #38bdf8;
}

.bt-stage-overlay-bottom {
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  right: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: rgba(11, 14, 21, 0.85);
  backdrop-filter: blur(16px);
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius-md);
  z-index: 2;
}

.bt-stage-caption {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--bt-text-secondary);
}

.bt-stage-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.85rem;
  background: #ffffff;
  color: #07080b;
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: 9999px;
  transition: transform 0.2s ease;
}

.bt-stage-btn:hover {
  transform: translateY(-1px);
}

/* ==========================================================================
   ACT 2: PHYSICAL REALITY & CREATOR ARCHITYPES (PHOTO + LIQUID GLASS TENSION)
   ========================================================================== */
.bt-sec-header {
  text-align: center;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: clamp(3rem, 6vw, 4.5rem);
}

.bt-sec-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bt-accent-cyan);
  margin-bottom: 0.75rem;
}

.bt-sec-title {
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--bt-text-primary);
  margin-bottom: 1rem;
}

.bt-sec-title-serif {
  font-family: var(--bt-font-display);
  font-style: italic;
  font-weight: 400;
}

.bt-sec-desc {
  font-size: clamp(0.95rem, 1.2vw, 1.1rem);
  line-height: 1.65;
  color: var(--bt-text-secondary);
}

.bt-architypes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 2.5vw, 2.5rem);
}

.bt-architype-card {
  position: relative;
  height: 520px;
  border-radius: var(--bt-radius-xl);
  overflow: hidden;
  border: 1px solid var(--bt-border);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.75rem;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.35s ease;
}

.bt-architype-card:hover {
  transform: translateY(-4px);
  border-color: var(--bt-border-bright);
}

.bt-architype-photo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.65) contrast(1.1);
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1), filter 0.6s ease;
  z-index: 0;
}

.bt-architype-card:hover .bt-architype-photo {
  transform: scale(1.05);
  filter: brightness(0.72) contrast(1.15);
}

.bt-architype-gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(7, 8, 11, 0.2) 0%,
    rgba(7, 8, 11, 0.6) 50%,
    rgba(7, 8, 11, 0.95) 100%
  );
  z-index: 1;
}

.bt-architype-hud {
  position: relative;
  z-index: 2;
  background: rgba(11, 14, 21, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-lg);
  padding: 1.5rem;
}

.bt-architype-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--bt-accent-blue);
  margin-bottom: 0.5rem;
}

.bt-architype-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.bt-architype-desc {
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--bt-text-secondary);
  margin-bottom: 1.25rem;
}

.bt-architype-telemetry,
.bt-architype-highlights {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 1.25rem;
}

.bt-highlight-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: #cbd5e1;
}

.bt-highlight-item svg {
  color: #34d399;
  flex-shrink: 0;
}

.bt-telem-row {
  display: flex;
  justify-content: space-between;
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
}

.bt-telem-label {
  color: var(--bt-text-muted);
}

.bt-telem-val {
  font-weight: 600;
  color: #38bdf8;
}

.bt-architype-btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.65rem 1rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  color: #ffffff;
  transition: all 0.2s ease;
}

.bt-architype-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
}

/* ==========================================================================
   ACT 3: BEGINROOMS 3D SPATIAL THINKING STUDIO (INTERACTIVE CANVAS & SPACES)
   ========================================================================== */
.bt-rooms-workspace-stage {
  border-radius: var(--bt-radius-xl);
  background: #080a0f;
  border: 1px solid var(--bt-border-bright);
  overflow: hidden;
  box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.8);
}

.bt-rooms-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.5rem;
  background: rgba(16, 20, 29, 0.95);
  border-bottom: 1px solid var(--bt-border);
  flex-wrap: wrap;
  gap: 1rem;
}

.bt-room-pills {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
}

.bt-room-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--bt-border);
  border-radius: 9999px;
  font-family: var(--bt-font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--bt-text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.bt-room-pill:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
}

.bt-room-pill.active {
  background: rgba(99, 102, 241, 0.18);
  border-color: rgba(99, 102, 241, 0.5);
  color: #c7d2fe;
}

.bt-room-tools-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.bt-viewport-split {
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  min-height: 480px;
}

.bt-spatial-canvas-area {
  position: relative;
  background: radial-gradient(circle at center, #111624 0%, #06080d 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.bt-spatial-canvas-area img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bt-spatial-details-col {
  padding: 2.5rem 2rem;
  background: rgba(11, 14, 21, 0.95);
  border-left: 1px solid var(--bt-border);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.bt-spatial-room-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.bt-spatial-room-desc {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--bt-text-secondary);
  margin-bottom: 1.75rem;
}

.bt-spatial-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.bt-spatial-features-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--bt-text-secondary);
}

.bt-spatial-features-list svg {
  color: var(--bt-accent-cyan);
  flex-shrink: 0;
  margin-top: 2px;
}

/* 3 Pillars of Spatial Architecture */
.bt-pillars-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.bt-pillar-item {
  padding: 1.75rem;
  background: var(--bt-surface);
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius-lg);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.bt-pillar-item:hover {
  transform: translateY(-3px);
  border-color: var(--bt-border-bright);
}

.bt-pillar-index {
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--bt-accent-blue);
  margin-bottom: 0.5rem;
  display: block;
}

.bt-pillar-head {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.5rem;
}

.bt-pillar-text {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--bt-text-muted);
}

/* ==========================================================================
   ACT 4: THE UTILITY MATRIX (LIVE SANDBOX TOOLS + 48-TOOL DECK)
   ========================================================================== */
.bt-sandbox-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.bt-sandbox-widget {
  padding: 1.75rem;
  background: var(--bt-surface-elevated);
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-xl);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.bt-widget-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--bt-accent-emerald);
  margin-bottom: 0.5rem;
}

.bt-widget-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.4rem;
}

.bt-widget-desc {
  font-size: 0.85rem;
  color: var(--bt-text-muted);
  margin-bottom: 1.25rem;
}

/* Dropzone Interactive Box */
.bt-dropzone-box {
  padding: 1.5rem 1rem;
  border: 2px dashed rgba(255, 255, 255, 0.15);
  border-radius: var(--bt-radius-md);
  text-align: center;
  background: rgba(0, 0, 0, 0.25);
  margin-bottom: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.bt-dropzone-box:hover {
  border-color: var(--bt-accent-blue);
  background: rgba(59, 130, 246, 0.05);
}

.bt-dropzone-icon {
  color: var(--bt-text-muted);
  margin-bottom: 0.5rem;
}

.bt-dropzone-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--bt-text-secondary);
}

.bt-dropzone-sub {
  font-size: 0.72rem;
  color: var(--bt-text-muted);
}

/* Calculator Slider Input */
.bt-slider-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.bt-slider-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
}

.bt-slider-val {
  font-family: var(--bt-font-mono);
  font-weight: 700;
  color: var(--bt-accent-amber);
}

.bt-range-input {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  outline: none;
  -webkit-appearance: none;
}

.bt-range-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #f59e0b;
  cursor: pointer;
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.5);
}

/* 48-Tool Filter Tabs Bar */
.bt-filter-deck-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: rgba(16, 20, 29, 0.8);
  backdrop-filter: blur(20px);
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-lg);
  margin-bottom: 2rem;
}

.bt-filter-pills-wrap {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
}

.bt-filter-pill {
  padding: 0.45rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--bt-text-secondary);
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.bt-filter-pill:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.06);
}

.bt-filter-pill.active {
  background: #ffffff;
  color: #07080b;
}

/* 48 Tool Dynamic Grid */
.bt-tools-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.bt-tool-card {
  padding: 1.25rem;
  background: rgba(16, 20, 29, 0.65);
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius-md);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 160px;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.bt-tool-card:hover {
  background: rgba(26, 32, 46, 0.85);
  border-color: var(--bt-border-bright);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.5);
}

.bt-tool-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.bt-tool-idx {
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  color: var(--bt-text-muted);
}

.bt-tool-badge {
  font-family: var(--bt-font-mono);
  font-size: 0.64rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 4px;
  color: var(--bt-accent-cyan);
}

.bt-tool-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.35rem;
  line-height: 1.3;
}

.bt-tool-desc {
  font-size: 0.8rem;
  line-height: 1.45;
  color: var(--bt-text-muted);
}

.bt-tool-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 0.75rem;
}

.bt-tool-cat {
  font-size: 0.72rem;
  color: var(--bt-text-muted);
  text-transform: capitalize;
}

.bt-tool-launch {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--bt-accent-blue);
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
}

/* ==========================================================================
   ACT 5: COMMERCIAL MONETIZATION SUITE & REVENUE ARMOR
   ========================================================================== */
.bt-commerce-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: center;
  margin-bottom: 5rem;
}

.bt-playbook-showcase {
  padding: 2.5rem;
  background: var(--bt-surface-elevated);
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-xl);
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 2rem;
  align-items: center;
}

.bt-playbook-cover {
  border-radius: var(--bt-radius-md);
  overflow: hidden;
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.bt-playbook-cover img {
  width: 100%;
  height: auto;
}

.bt-playbook-info h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 0.6rem;
  letter-spacing: -0.02em;
}

.bt-playbook-info p {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--bt-text-secondary);
  margin-bottom: 1.25rem;
}

.bt-check-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.bt-check-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--bt-text-secondary);
}

.bt-check-list svg {
  color: var(--bt-accent-amber);
  flex-shrink: 0;
}

.bt-btn-gold {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #000000;
  font-weight: 700;
  box-shadow: 0 10px 25px -5px rgba(245, 158, 11, 0.4);
}

.bt-btn-gold:hover {
  box-shadow: 0 14px 30px -5px rgba(245, 158, 11, 0.6);
}

/* ==========================================================================
   ACT 6: TRANSPARENT PRICING
   ========================================================================== */
.bt-pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.bt-price-card {
  padding: 2rem 1.5rem;
  background: var(--bt-surface);
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius-lg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.bt-price-card:hover {
  transform: translateY(-3px);
  border-color: var(--bt-border-bright);
}

.bt-price-card.featured {
  background: rgba(26, 32, 48, 0.9);
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 0 15px 35px -10px rgba(99, 102, 241, 0.25);
  position: relative;
}

.bt-price-card.featured::before {
  content: 'MOST POPULAR';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.2rem 0.65rem;
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  color: #ffffff;
  font-family: var(--bt-font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  border-radius: 9999px;
  letter-spacing: 0.05em;
}

.bt-price-tier {
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--bt-accent-blue);
  margin-bottom: 0.5rem;
}

.bt-price-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 0.4rem;
}

.bt-price-desc {
  font-size: 0.82rem;
  color: var(--bt-text-muted);
  min-height: 40px;
  margin-bottom: 1.25rem;
}

.bt-price-val {
  font-size: 2.25rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1;
  margin-bottom: 1.5rem;
}

.bt-price-val small {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--bt-text-muted);
}

.bt-price-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 1.25rem;
}

.bt-price-features li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--bt-text-secondary);
}

.bt-price-features svg {
  color: var(--bt-accent-emerald);
  flex-shrink: 0;
}

.bt-btn-block {
  width: 100%;
  text-align: center;
}

/* ==========================================================================
   ACT 7: NOTE FROM THE MAKER (EDITORIAL FOUNDER LETTER)
   ========================================================================== */
.bt-founder-letter-wrap {
  max-width: 820px;
  margin: 0 auto;
}

.bt-founder-letter-card {
  padding: clamp(2.5rem, 5vw, 4.25rem);
  background: linear-gradient(180deg, rgba(16, 22, 34, 0.75) 0%, rgba(9, 12, 18, 0.85) 100%);
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-2xl);
  box-shadow: 0 30px 70px -20px rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(24px) saturate(180%);
  position: relative;
  overflow: hidden;
}

.bt-founder-letter-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 15%;
  right: 15%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.6), rgba(99, 102, 241, 0.4), transparent);
}

.bt-founder-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 2rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.bt-founder-avatar-wrap {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
  flex-shrink: 0;
}

.bt-founder-avatar-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bt-founder-meta-header {
  display: flex;
  flex-direction: column;
}

.bt-founder-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.01em;
}

.bt-founder-role {
  font-size: 0.85rem;
  color: #93c5fd;
  margin-top: 0.15rem;
  font-weight: 500;
}

.bt-founder-letter-title {
  font-family: var(--bt-font-display);
  font-style: italic;
  font-size: clamp(1.85rem, 3.5vw, 2.75rem);
  font-weight: 400;
  color: #ffffff;
  line-height: 1.25;
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
}

.bt-founder-body p {
  font-size: 1rem;
  line-height: 1.75;
  color: #cbd5e1;
  margin-bottom: 1.25rem;
}

.bt-founder-body p.lead {
  font-size: 1.15rem;
  line-height: 1.7;
  color: #f1f5f9;
  font-weight: 450;
}

.bt-founder-footer {
  margin-top: 2.25rem;
  padding-top: 1.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.bt-founder-contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--bt-radius-md);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.88rem;
  transition: all 0.2s ease;
}

.bt-founder-contact-btn:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

.bt-founder-legal-note {
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  color: var(--bt-text-muted);
  line-height: 1.5;
}

/* Backwards compatibility for manifesto box */
.bt-manifesto-box {
  padding: clamp(2.5rem, 5vw, 4rem);
  background: var(--bt-surface);
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-xl);
}

/* ==========================================================================
   MEGA FOOTER
   ========================================================================== */
.bt-footer {
  padding-top: 5rem;
  padding-bottom: 3rem;
  background: #040508;
  border-top: 1px solid var(--bt-border);
}

.bt-footer-grid {
  display: grid;
  grid-template-columns: 1.3fr repeat(3, 0.9fr);
  gap: clamp(2rem, 4vw, 3.5rem);
  margin-bottom: 4rem;
}

.bt-footer-brand-col p {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--bt-text-muted);
  margin-top: 1rem;
  margin-bottom: 1.25rem;
  max-width: 320px;
}

.bt-footer-title {
  font-family: var(--bt-font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #ffffff;
  margin-bottom: 1.25rem;
}

.bt-footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.bt-footer-links a {
  font-size: 0.82rem;
  color: var(--bt-text-muted);
  transition: color 0.2s ease;
}

.bt-footer-links a:hover {
  color: #ffffff;
}

.bt-footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.78rem;
  color: var(--bt-text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

.bt-footer-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.bt-footer-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--bt-accent-emerald);
  box-shadow: 0 0 6px var(--bt-accent-emerald);
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES
   ========================================================================== */
@media (max-width: 1024px) {
  .bt-hero-grid {
    grid-template-columns: 1fr;
  }
  .bt-architypes-grid {
    grid-template-columns: 1fr;
  }
  .bt-architype-card {
    height: 480px;
  }
  .bt-viewport-split {
    grid-template-columns: 1fr;
  }
  .bt-spatial-details-col {
    border-left: none;
    border-top: 1px solid var(--bt-border);
  }
  .bt-pillars-row {
    grid-template-columns: 1fr;
  }
  .bt-sandbox-grid {
    grid-template-columns: 1fr;
  }
  .bt-tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .bt-commerce-grid {
    grid-template-columns: 1fr;
  }
  .bt-playbook-showcase {
    grid-template-columns: 1fr;
  }
  .bt-pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .bt-manifesto-box {
    grid-template-columns: 1fr;
  }
  .bt-footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .bt-nav-dock {
    top: 0.75rem;
  }
  .bt-nav-links {
    display: none;
  }
  .bt-tools-grid {
    grid-template-columns: 1fr;
  }
  .bt-pricing-grid {
    grid-template-columns: 1fr;
  }
  .bt-footer-grid {
    grid-template-columns: 1fr;
  }
  .bt-hero-trust {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

/* ==========================================================================
   2026 EXPANDED PRODUCT SUITE, CAROUSEL, VIDEO STAGE & ENQUIRY MODAL STYLES
   ========================================================================== */

/* Brand Logo Vector */
.bt-brand-logo {
  height: 34px !important;
  width: auto !important;
  display: block;
  object-fit: contain;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}
.bt-brand:hover .bt-brand-logo {
  transform: scale(1.05);
}

/* Hero Media Switcher & Video Frame */
.bt-hero-preview-stage {
  position: relative;
  background: #090b10;
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-lg);
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8), 0 0 40px rgba(99, 102, 241, 0.15);
}
.bt-hero-preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: rgba(16, 20, 29, 0.95);
  border-bottom: 1px solid var(--bt-border);
  flex-wrap: wrap;
  gap: 0.75rem;
}
.bt-hero-window-dots {
  display: flex;
  gap: 6px;
}
.bt-hero-window-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.bt-dot-red { background: #ef4444; }
.bt-dot-yellow { background: #f59e0b; }
.bt-dot-green { background: #10b981; }

.bt-hero-media-tabs {
  display: flex;
  gap: 0.35rem;
}
.bt-hero-media-tab {
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-family: var(--bt-font-mono);
  font-weight: 600;
  color: var(--bt-text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--bt-border);
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-hero-media-tab:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}
.bt-hero-media-tab.active {
  background: rgba(99, 102, 241, 0.25);
  border-color: rgba(99, 102, 241, 0.6);
  color: #c7d2fe;
}
.bt-hero-media-viewport {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: #000;
  overflow: hidden;
}
.bt-hero-media-viewport video,
.bt-hero-media-viewport img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.bt-hero-video-badge {
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.75rem;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 9999px;
  font-family: var(--bt-font-mono);
  font-size: 0.7rem;
  color: #a7f3d0;
  font-weight: 600;
}

/* Unobstructed Professional Market Cards (Act 2) */
.bt-role-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}
.bt-role-card {
  background: var(--bt-surface);
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}
.bt-role-card:hover {
  transform: translateY(-4px);
  border-color: var(--bt-border-bright);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6);
}
.bt-role-img-wrap {
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: #111520;
}
.bt-role-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.bt-role-card:hover .bt-role-img-wrap img {
  transform: scale(1.04);
}
.bt-role-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.bt-role-kicker {
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #38bdf8;
  margin-bottom: 0.5rem;
}
.bt-role-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.65rem;
}
.bt-role-desc {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--bt-text-secondary);
  margin-bottom: 1.25rem;
}
.bt-role-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  margin-top: auto;
}
.bt-role-features li {
  font-size: 0.82rem;
  color: #94a3b8;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.bt-role-features li svg {
  color: #10b981;
  flex-shrink: 0;
}
.bt-role-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1rem;
  border-radius: var(--bt-radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--bt-border);
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  transition: all 0.2s ease;
}
.bt-role-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--bt-border-bright);
}

/* Dedicated Product Showcases (FormulaMapper, Cash Lock Kit) */
.bt-dedicated-product-card {
  background: linear-gradient(135deg, rgba(16, 20, 29, 0.95), rgba(11, 14, 21, 0.95));
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-xl);
  overflow: hidden;
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.8);
  margin-bottom: 3.5rem;
}
.bt-dedicated-product-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 2.5rem;
  padding: clamp(2rem, 4vw, 3.5rem);
}
.bt-prod-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #f59e0b;
  margin-bottom: 0.85rem;
}
.bt-prod-title {
  font-size: clamp(1.85rem, 3.2vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: #fff;
  margin-bottom: 0.85rem;
  line-height: 1.15;
}
.bt-prod-desc {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--bt-text-secondary);
  margin-bottom: 1.75rem;
}
.bt-prod-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2rem;
}
.bt-prod-bullets li {
  font-size: 0.88rem;
  color: #cbd5e1;
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}
.bt-prod-bullets li svg {
  color: #38bdf8;
  flex-shrink: 0;
  margin-top: 3px;
}
.bt-prod-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.85rem;
}
.bt-btn-buy-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #07080b;
  font-weight: 800;
  font-size: 0.92rem;
  border-radius: var(--bt-radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}
.bt-btn-buy-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(245, 158, 11, 0.5);
}
.bt-btn-paypal {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.85rem 1.3rem;
  background: #0070ba;
  color: #fff;
  font-weight: 700;
  font-size: 0.88rem;
  border-radius: var(--bt-radius-sm);
  transition: opacity 0.2s ease;
}
.bt-btn-paypal:hover {
  opacity: 0.9;
}
.bt-btn-details-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.85rem 1.2rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--bt-border);
  color: var(--bt-text-secondary);
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: var(--bt-radius-sm);
  transition: all 0.2s ease;
}
.bt-btn-details-link:hover {
  color: #fff;
  border-color: var(--bt-border-bright);
}

/* Dedicated Product Preview Media Window */
.bt-prod-preview-media {
  position: relative;
  background: #090b10;
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}
.bt-prod-preview-media video,
.bt-prod-preview-media img {
  width: 100%;
  height: auto;
  display: block;
}

/* 48 Tools Carousel Deck */
.bt-tools-carousel-container {
  position: relative;
  margin-top: 2rem;
}
.bt-carousel-header-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.bt-category-tabs-wrap {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  overflow-x: auto;
  padding-bottom: 4px;
}
.bt-category-tab {
  padding: 0.45rem 0.9rem;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--bt-border);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--bt-text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}
.bt-category-tab:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}
.bt-category-tab.active {
  background: rgba(59, 130, 246, 0.15);
  border-color: rgba(59, 130, 246, 0.5);
  color: #93c5fd;
}
.bt-carousel-arrows {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.bt-carousel-arrow-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--bt-border);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-carousel-arrow-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--bt-border-bright);
}

.bt-tools-carousel-track {
  display: flex;
  gap: 1.25rem;
  overflow-x: auto;
  scroll-behavior: smooth;
  padding: 0.5rem 0 1.5rem;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}
.bt-tools-carousel-track::-webkit-scrollbar {
  height: 6px;
}
.bt-tools-carousel-track::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 3px;
}
.bt-tools-carousel-track .bt-tool-card {
  flex: 0 0 300px;
  max-width: 300px;
  background: var(--bt-surface);
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius-md);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
}
.bt-tools-carousel-track .bt-tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--bt-border-bright);
}
.bt-tool-card-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}
.bt-tool-card-cat {
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #38bdf8;
  margin-bottom: 0.35rem;
}
.bt-tool-card-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}
.bt-tool-card-desc {
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--bt-text-secondary);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}
.bt-tool-card-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: auto;
}
.bt-tool-btn-try {
  flex: 1;
  padding: 0.5rem;
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.35);
  color: #c7d2fe;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 6px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-tool-btn-try:hover {
  background: rgba(99, 102, 241, 0.3);
}
.bt-tool-btn-open {
  padding: 0.5rem 0.65rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--bt-border);
  color: var(--bt-text-muted);
  font-size: 0.75rem;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}
.bt-tool-btn-open:hover {
  color: #fff;
  border-color: var(--bt-border-bright);
}

/* Tool Live Sandbox Stage */
.bt-tool-sandbox-stage {
  margin-top: 2rem;
  background: #090b10;
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-lg);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}
.bt-sandbox-nav-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--bt-border);
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.bt-sandbox-tab {
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--bt-text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--bt-border);
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-sandbox-tab:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}
.bt-sandbox-tab.active {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.4);
  color: #6ee7b7;
}
.bt-sandbox-panel {
  display: none;
}
.bt-sandbox-panel.active {
  display: block;
}

/* Founder Note & LinkedIn Button */
.bt-founder-card {
  background: linear-gradient(135deg, rgba(16, 20, 29, 0.9), rgba(11, 14, 21, 0.95));
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-xl);
  padding: clamp(2rem, 4vw, 3.5rem);
  box-shadow: 0 25px 50px -15px rgba(0, 0, 0, 0.8);
}
.bt-founder-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: center;
}
.bt-founder-photo-col {
  text-align: center;
}
.bt-founder-photo-wrap {
  width: 200px;
  height: 200px;
  margin: 0 auto 1.25rem;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.6);
}
.bt-founder-photo-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.bt-founder-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.25rem;
}
.bt-founder-role {
  font-size: 0.82rem;
  color: var(--bt-text-muted);
  font-family: var(--bt-font-mono);
}
.bt-founder-letter h2 {
  font-family: var(--bt-font-display);
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  color: #fff;
  margin-bottom: 1.25rem;
  line-height: 1.15;
}
.bt-founder-letter p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--bt-text-secondary);
  margin-bottom: 1.25rem;
}
.bt-founder-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--bt-border);
}
.bt-linkedin-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  background: #0077b5;
  color: #fff;
  font-weight: 700;
  font-size: 0.88rem;
  border-radius: var(--bt-radius-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 15px rgba(0, 119, 181, 0.35);
}
.bt-linkedin-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 119, 181, 0.5);
  color: #fff;
}
.bt-enquiry-trigger-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--bt-border-bright);
  color: #fff;
  font-weight: 600;
  font-size: 0.88rem;
  border-radius: var(--bt-radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-enquiry-trigger-btn:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* Direct Enquiry Modal */
.bt-modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99999;
  background: rgba(6, 8, 13, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}
.bt-modal-backdrop.active {
  display: flex;
}
.bt-modal-card {
  background: #10141d;
  border: 1px solid var(--bt-border-bright);
  border-radius: var(--bt-radius-lg);
  max-width: 520px;
  width: 100%;
  padding: 2rem;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8);
  position: relative;
  animation: modalScaleIn 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes modalScaleIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.bt-modal-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: transparent;
  border: none;
  color: var(--bt-text-muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: color 0.15s ease;
}
.bt-modal-close:hover {
  color: #fff;
}
.bt-modal-kicker {
  font-family: var(--bt-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #38bdf8;
  margin-bottom: 0.35rem;
  display: block;
}
.bt-modal-header h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.35rem;
}
.bt-modal-header p {
  font-size: 0.85rem;
  color: var(--bt-text-secondary);
  margin-bottom: 1.5rem;
}
.bt-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.bt-form-field {
  margin-bottom: 1rem;
  text-align: left;
}
.bt-form-field label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: #cbd5e1;
  margin-bottom: 0.35rem;
}
.bt-form-field input,
.bt-form-field select,
.bt-form-field textarea {
  width: 100%;
  background: #07090e;
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius-sm);
  padding: 0.65rem 0.85rem;
  color: #fff;
  font-size: 0.88rem;
  transition: border-color 0.2s ease;
}
.bt-form-field input:focus,
.bt-form-field select:focus,
.bt-form-field textarea:focus {
  border-color: #3b82f6;
  outline: none;
}
.bt-modal-submit-btn {
  width: 100%;
  padding: 0.85rem;
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  color: #fff;
  font-weight: 700;
  font-size: 0.92rem;
  border-radius: var(--bt-radius-sm);
  cursor: pointer;
  margin-top: 0.5rem;
  transition: all 0.2s ease;
}
.bt-modal-submit-btn:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}
.bt-modal-submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.bt-form-status {
  font-size: 0.82rem;
  margin-top: 0.75rem;
  text-align: center;
}

@media (max-width: 900px) {
  .bt-role-grid {
    grid-template-columns: 1fr;
  }
  .bt-dedicated-product-grid {
    grid-template-columns: 1fr;
  }
  .bt-rooms-showcase-grid {
    grid-template-columns: 1fr !important;
  }
  .bt-vaults-grid {
    grid-template-columns: 1fr !important;
  }
  .bt-founder-grid {
    grid-template-columns: 1fr;
  }
  .bt-form-row {
    grid-template-columns: 1fr;
  }
  .bt-sandbox-form-grid {
    grid-template-columns: 1fr !important;
  }
}

/* ==========================================================================
   2026 PRECISION DESIGN ARCHITECTURE (REWORKED & POLISHED)
   ========================================================================== */

/* Nav Enquiry Button */
.bt-nav-enquiry-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.45rem 1rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff !important;
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  margin-right: 0.5rem;
  transition: all 0.2s ease;
}
.bt-nav-enquiry-btn:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.35);
}

/* Ambient Section Lighting */
.bt-hero {
  position: relative;
  background: radial-gradient(circle at 50% -20%, rgba(59, 130, 246, 0.18), transparent 70%),
              radial-gradient(circle at 85% 25%, rgba(139, 92, 246, 0.12), transparent 50%),
              #07090e;
  overflow: hidden;
}
.bt-hero::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(56, 189, 248, 0.3), transparent);
}

.bt-hero-glow-text {
  display: block;
  font-style: normal !important;
  font-family: var(--bt-font-sans) !important;
  font-weight: 800;
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-top: 0.35rem;
}

/* Hero Stage & Telemetry Dock */
.bt-stage-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: rgba(12, 16, 24, 0.95);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.bt-stage-status-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #38bdf8;
}
.bt-stage-telemetry {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  color: #94a3b8;
}
.bt-stage-telemetry strong {
  color: #ffffff;
}

/* Professional Role Cards (Act 2) */
.bt-role-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  margin-top: 2.5rem;
}
.bt-role-card {
  background: linear-gradient(180deg, rgba(20, 26, 38, 0.85) 0%, rgba(11, 15, 23, 0.95) 100%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.bt-role-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 25px 50px -12px rgba(14, 165, 233, 0.25);
}
.bt-role-img-wrap {
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #000;
  position: relative;
}
.bt-role-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.bt-role-card:hover .bt-role-img-wrap img {
  transform: scale(1.04);
}
.bt-role-body {
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.bt-role-kicker {
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #38bdf8;
  margin-bottom: 0.5rem;
}
.bt-role-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.6rem;
}
.bt-role-desc {
  font-size: 0.85rem;
  color: var(--bt-text-secondary);
  line-height: 1.55;
  margin-bottom: 1.25rem;
}
.bt-role-features {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.bt-role-features li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.82rem;
  color: #cbd5e1;
}
.bt-role-features li svg {
  color: #10b981;
  flex-shrink: 0;
}
.bt-role-btn {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: #38bdf8;
  text-decoration: none;
  transition: gap 0.2s ease;
}
.bt-role-btn:hover {
  gap: 0.75rem;
  color: #60a5fa;
}

/* Dedicated Paid Products (FormulaMapper & Freelancer Kit) */
.bt-dedicated-product-card {
  background: linear-gradient(180deg, rgba(18, 24, 38, 0.9) 0%, rgba(10, 14, 22, 0.96) 100%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 3rem 2.5rem;
  box-shadow: 0 25px 50px -15px rgba(0, 0, 0, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  position: relative;
  overflow: hidden;
}
.bt-dedicated-product-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 3rem;
  align-items: center;
}
.bt-prod-kicker {
  display: inline-block;
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #38bdf8;
  margin-bottom: 0.75rem;
}
.bt-prod-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.25;
  margin-bottom: 1rem;
}
.bt-prod-desc {
  font-size: 0.95rem;
  color: var(--bt-text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}
.bt-prod-bullets {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}
.bt-prod-bullets li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.88rem;
  line-height: 1.5;
  color: #cbd5e1;
}
.bt-prod-bullets li svg {
  flex-shrink: 0;
  margin-top: 0.2rem;
}
.bt-prod-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.bt-btn-buy-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 1.6rem;
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: #ffffff !important;
  font-weight: 700;
  font-size: 0.92rem;
  border-radius: var(--bt-radius-sm);
  border: none;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.4);
  transition: all 0.2s ease;
}
.bt-btn-buy-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 30px -5px rgba(59, 130, 246, 0.6);
}

.bt-prod-media-frame {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.7);
  background: #0c1017;
}
.bt-prod-media-frame img {
  width: 100%;
  height: auto;
  display: block;
}
.bt-media-status-badge {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #38bdf8;
}

/* BeginRooms 3D Spatial Grid & 4-Mode Selectors */
.bt-rooms-showcase-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 2rem;
  align-items: stretch;
}
.bt-rooms-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.bt-room-nav-btn {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.15rem 1.25rem;
  background: var(--bt-surface);
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius-md);
  text-align: left;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  width: 100%;
}
.bt-room-nav-btn:hover {
  border-color: var(--bt-border-bright);
  background: rgba(255, 255, 255, 0.04);
}
.bt-room-nav-btn.active {
  background: rgba(59, 130, 246, 0.12);
  border-color: #3b82f6;
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.25);
}
.bt-room-num {
  font-family: var(--bt-font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: #38bdf8;
  padding-top: 2px;
}
.bt-room-btn-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: #fff;
  margin: 0 0 0.25rem 0;
}
.bt-room-btn-desc {
  font-size: 0.8rem;
  color: var(--bt-text-secondary);
  margin: 0;
  line-height: 1.4;
}

/* Commercial Growth Vaults Deck */
.bt-vaults-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  margin-top: 2.5rem;
}
.bt-vault-card {
  background: linear-gradient(180deg, rgba(20, 26, 38, 0.85) 0%, rgba(11, 15, 23, 0.95) 100%);
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius-lg);
  padding: 2.25rem 2rem;
  display: flex;
  flex-direction: column;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6);
}
.bt-vault-card:hover {
  transform: translateY(-4px);
  border-color: var(--bt-border-bright);
  box-shadow: 0 25px 50px -15px rgba(0, 0, 0, 0.8);
}
.bt-vault-card.bt-vault-highlight {
  border-color: rgba(245, 158, 11, 0.5);
  background: linear-gradient(180deg, rgba(245, 158, 11, 0.08), rgba(11, 14, 21, 0.95));
  box-shadow: 0 20px 40px -15px rgba(245, 158, 11, 0.2);
}
.bt-vault-pill {
  display: inline-block;
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #38bdf8;
  margin-bottom: 0.75rem;
}
.bt-vault-pill.bt-pill-amber {
  color: #f59e0b;
}
.bt-vault-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}
.bt-vault-desc {
  font-size: 0.85rem;
  color: var(--bt-text-secondary);
  line-height: 1.55;
  margin-bottom: 1.75rem;
  flex-grow: 1;
}
.bt-vault-price {
  font-size: 1.85rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}
.bt-vault-usd {
  font-size: 0.85rem;
  color: var(--bt-text-muted);
  font-weight: 500;
}
.bt-btn-buy-vault {
  width: 100%;
  padding: 0.85rem 1rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--bt-border-bright);
  color: #fff;
  font-weight: 600;
  font-size: 0.88rem;
  border-radius: var(--bt-radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-btn-buy-vault:hover {
  background: #3b82f6;
  border-color: #3b82f6;
}
.bt-vault-highlight .bt-btn-buy-vault {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #000;
  border: none;
  font-weight: 700;
}

/* ==========================================================================
   ACT 4: 48 TOOLS PAGINATED SHOWCASE & CAROUSEL
   ========================================================================== */
.bt-carousel-header-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 2rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.bt-category-tabs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.bt-category-tab {
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 9999px;
  color: var(--bt-text-secondary);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-category-tab:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}
.bt-category-tab.active {
  background: rgba(56, 189, 248, 0.15);
  border-color: #38bdf8;
  color: #38bdf8;
}

.bt-carousel-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.bt-page-indicator {
  font-family: var(--bt-font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: #94a3b8;
}
.bt-pagination-dots {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.bt-dot {
  width: 7px;
  height: 7px;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-dot.active {
  width: 18px;
  background: #38bdf8;
  border-radius: 4px;
}
.bt-carousel-arrow-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-carousel-arrow-btn:hover:not(:disabled) {
  background: #38bdf8;
  border-color: #38bdf8;
  color: #000;
}
.bt-carousel-arrow-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* The Tools Deck Viewport (6 cards per page) */
.bt-tools-deck-viewport {
  position: relative;
  min-height: 420px;
}
.bt-tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

/* Master Tool Card Styling */
.bt-tool-card {
  background: linear-gradient(180deg, rgba(22, 28, 42, 0.85) 0%, rgba(13, 17, 26, 0.95) 100%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 1.35rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 180px;
  text-decoration: none;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}
.bt-tool-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.45);
  background: linear-gradient(180deg, rgba(28, 36, 54, 0.9) 0%, rgba(16, 21, 33, 0.96) 100%);
  box-shadow: 0 16px 35px -8px rgba(14, 165, 233, 0.3);
}

.bt-tool-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}
.bt-tool-cat-pill {
  font-family: var(--bt-font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 9999px;
}
.cat-finance {
  background: rgba(245, 158, 11, 0.15);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.3);
}
.cat-media {
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.3);
}
.cat-web {
  background: rgba(14, 165, 233, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(14, 165, 233, 0.3);
}
.cat-privacy {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}
.cat-productivity {
  background: rgba(244, 63, 94, 0.15);
  color: #fb7185;
  border: 1px solid rgba(244, 63, 94, 0.3);
}

.bt-tool-wasm-pill {
  font-family: var(--bt-font-mono);
  font-size: 0.65rem;
  color: #94a3b8;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}
.bt-tool-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  margin: 0 0 0.4rem 0;
  line-height: 1.3;
}
.bt-tool-desc {
  font-size: 0.82rem;
  line-height: 1.5;
  color: #94a3b8;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.bt-tool-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  margin-top: 0.85rem;
}
.bt-tool-subtag {
  font-family: var(--bt-font-mono);
  font-size: 0.7rem;
  color: #64748b;
}
.bt-tool-launch-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: #38bdf8;
  transition: transform 0.2s ease;
}
.bt-tool-card:hover .bt-tool-launch-btn {
  transform: translateX(3px);
  color: #60a5fa;
}

/* ==========================================================================
   SILICON LAB INTERACTIVE PLAYGROUND
   ========================================================================== */
.bt-sandbox-wrap {
  background: linear-gradient(180deg, rgba(18, 23, 35, 0.9) 0%, rgba(10, 14, 21, 0.96) 100%);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 20px 50px -15px rgba(0, 0, 0, 0.7), 0 0 30px rgba(56, 189, 248, 0.08);
}
.bt-sandbox-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: rgba(12, 16, 25, 0.95);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  flex-wrap: wrap;
  gap: 1rem;
}
.bt-sandbox-header-info {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}
.bt-sandbox-badge {
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: #38bdf8;
  letter-spacing: 0.06em;
}
.bt-sandbox-subbadge {
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  color: #64748b;
  border-left: 1px solid rgba(255, 255, 255, 0.1);
  padding-left: 0.75rem;
}
.bt-sandbox-tabs {
  display: flex;
  gap: 0.4rem;
}
.bt-sandbox-tab {
  padding: 0.45rem 0.9rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  color: #cbd5e1;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-sandbox-tab:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}
.bt-sandbox-tab.active {
  background: #3b82f6;
  border-color: #3b82f6;
  color: #fff;
}

.bt-sandbox-body {
  padding: 2rem 2.25rem;
}
.bt-sandbox-panel {
  display: none;
}
.bt-sandbox-panel.active {
  display: block;
}
.bt-sandbox-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.5rem;
  align-items: start;
}
.bt-sandbox-field-label {
  display: block;
  font-family: var(--bt-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #94a3b8;
  margin-bottom: 0.5rem;
}
.bt-sandbox-input, .bt-sandbox-select {
  width: 100%;
  background: #080c14;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  color: #fff;
  font-size: 0.88rem;
  transition: all 0.2s ease;
}
.bt-sandbox-input:focus, .bt-sandbox-select:focus {
  border-color: #38bdf8;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.25);
  outline: none;
}
.bt-sandbox-presets {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.65rem;
  flex-wrap: wrap;
}
.bt-preset-label {
  font-size: 0.75rem;
  color: #64748b;
}
.bt-preset-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  color: #cbd5e1;
  font-size: 0.72rem;
  cursor: pointer;
  transition: all 0.15s ease;
}
.bt-preset-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}
.bt-sandbox-execute-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  background: linear-gradient(135deg, #38bdf8, #2563eb);
  color: #000;
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  margin-top: 1.25rem;
  transition: all 0.2s ease;
}
.bt-sandbox-execute-btn:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}

/* Output Console */
.bt-sandbox-output-col {
  display: flex;
  flex-direction: column;
}
.bt-sandbox-terminal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}
.bt-terminal-title {
  font-family: var(--bt-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: #38bdf8;
}
.bt-terminal-status {
  font-family: var(--bt-font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: #10b981;
}
.bt-sandbox-output-box {
  background: #060910;
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 8px;
  padding: 1.1rem 1.25rem;
  font-family: var(--bt-font-mono);
  font-size: 0.85rem;
  color: #38bdf8;
  word-break: break-all;
  min-height: 56px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.6);
}
.bt-tax-breakdown-box {
  gap: 0.4rem;
}
.bt-tax-line {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #94a3b8;
}
.bt-tax-line strong {
  color: #fff;
}
.bt-tax-total {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 0.5rem;
  margin-top: 0.25rem;
  font-size: 1rem;
  color: #38bdf8 !important;
}
.bt-tax-total strong {
  color: #38bdf8 !important;
  font-size: 1.1rem;
}

.bt-sandbox-output-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}
.bt-sandbox-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.65rem 1.15rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-sandbox-copy-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
}
.bt-sandbox-copy-btn.copied {
  background: #059669 !important;
  border-color: #059669 !important;
  color: #fff !important;
}
.bt-sandbox-direct-link {
  font-size: 0.82rem;
  color: #38bdf8;
  text-decoration: none;
}
.bt-sandbox-direct-link:hover {
  text-decoration: underline;
}

.bt-sandbox-qr-container {
  background: #ffffff;
  padding: 1.25rem;
  border-radius: 12px;
  display: inline-block;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
}
.bt-sandbox-qr-box {
  width: 140px;
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.bt-sandbox-qr-box svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* ==========================================================================
   ACT 5: FOUNDER & ABOUT SECTION
   ========================================================================== */
.bt-founder-card {
  background: linear-gradient(180deg, rgba(20, 26, 38, 0.85) 0%, rgba(11, 15, 23, 0.95) 100%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 3rem 2.5rem;
  box-shadow: 0 25px 50px -15px rgba(0, 0, 0, 0.7);
}
.bt-founder-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 3rem;
  align-items: start;
}
.bt-founder-avatar-col {
  text-align: center;
}
.bt-founder-avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(56, 189, 248, 0.4);
  box-shadow: 0 0 25px rgba(56, 189, 248, 0.2);
  margin-bottom: 1rem;
}
.bt-founder-meta {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.bt-founder-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}
.bt-founder-role {
  font-size: 0.82rem;
  color: #38bdf8;
  font-family: var(--bt-font-mono);
}
.bt-founder-loc {
  font-size: 0.78rem;
  color: #64748b;
}
.bt-founder-letter {
  display: flex;
  flex-direction: column;
}
.bt-founder-kicker {
  font-family: var(--bt-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #38bdf8;
  margin-bottom: 0.5rem;
}
.bt-founder-headline {
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.35;
  margin-bottom: 1.25rem;
}
.bt-founder-letter p {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--bt-text-secondary);
  margin-bottom: 1rem;
}
.bt-founder-letter p strong {
  color: #fff;
}
.bt-founder-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}
.bt-founder-linkedin-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.5rem;
  background: #0a66c2;
  color: #fff !important;
  font-weight: 700;
  font-size: 0.92rem;
  border-radius: var(--bt-radius-sm);
  transition: all 0.2s ease;
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(10, 102, 194, 0.4);
}
.bt-founder-linkedin-btn:hover {
  background: #084e96;
  transform: translateY(-1px);
}
.bt-founder-enquiry-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.5rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--bt-border-bright);
  color: #fff;
  font-weight: 600;
  font-size: 0.92rem;
  border-radius: var(--bt-radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-founder-enquiry-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.4);
}
.bt-founder-legal-note {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.78rem;
  color: #64748b;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .bt-role-grid {
    grid-template-columns: 1fr;
  }
  .bt-dedicated-product-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .bt-rooms-showcase-grid {
    grid-template-columns: 1fr !important;
  }
  .bt-vaults-grid {
    grid-template-columns: 1fr !important;
  }
  .bt-founder-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .bt-sandbox-grid {
    grid-template-columns: 1fr !important;
    gap: 2rem;
  }
  .bt-tools-grid {
    grid-template-columns: repeat(2, 1fr) !important;
  }
}

@media (max-width: 640px) {
  .bt-tools-grid {
    grid-template-columns: 1fr !important;
  }
  .bt-prod-title {
    font-size: 1.6rem;
  }
  .bt-founder-headline {
    font-size: 1.3rem;
  }
}


/* Hero Stage Header Refinements */
.bt-stage-header {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  padding: 0.65rem 1rem !important;
  background: rgba(12, 16, 24, 0.96) !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08) !important;
  gap: 0.75rem !important;
}
.bt-window-controls {
  display: flex !important;
  gap: 6px !important;
  flex-shrink: 0 !important;
}
.bt-stage-status-bar {
  display: flex !important;
  align-items: center !important;
  gap: 0.45rem !important;
  font-family: var(--bt-font-mono) !important;
  font-size: 0.68rem !important;
  font-weight: 700 !important;
  letter-spacing: 0.06em !important;
  color: #38bdf8 !important;
  overflow: hidden !important;
  white-space: nowrap !important;
  text-overflow: ellipsis !important;
}
.bt-media-tabs {
  display: flex !important;
  gap: 0.35rem !important;
  flex-shrink: 0 !important;
}
.bt-media-tab {
  padding: 0.3rem 0.65rem !important;
  background: rgba(255, 255, 255, 0.06) !important;
  border: 1px solid rgba(255, 255, 255, 0.1) !important;
  border-radius: 4px !important;
  color: #cbd5e1 !important;
  font-size: 0.72rem !important;
  font-weight: 600 !important;
  cursor: pointer !important;
  transition: all 0.2s ease !important;
}
.bt-media-tab:hover {
  background: rgba(255, 255, 255, 0.12) !important;
  color: #fff !important;
}
.bt-media-tab.active {
  background: #3b82f6 !important;
  border-color: #3b82f6 !important;
  color: #fff !important;
}
.bt-stage-overlay {
  position: absolute !important;
  bottom: 0 !important;
  left: 0 !important;
  right: 0 !important;
  padding: 0.85rem 1.25rem !important;
  background: linear-gradient(180deg, transparent 0%, rgba(8, 12, 18, 0.92) 50%, rgba(8, 12, 18, 0.98) 100%) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  border-top: 1px solid rgba(255, 255, 255, 0.08) !important;
  gap: 1rem !important;
}
.bt-stage-enter-btn {
  display: inline-flex !important;
  align-items: center !important;
  gap: 0.4rem !important;
  padding: 0.45rem 0.9rem !important;
  background: #3b82f6 !important;
  color: #fff !important;
  font-size: 0.78rem !important;
  font-weight: 700 !important;
  border-radius: 4px !important;
  text-decoration: none !important;
  flex-shrink: 0 !important;
}
.bt-btn-demo {
  display: inline-flex !important;
  align-items: center !important;
  gap: 0.5rem !important;
  padding: 0.85rem 1.4rem !important;
  background: rgba(255, 255, 255, 0.08) !important;
  border: 1px solid rgba(255, 255, 255, 0.2) !important;
  color: #ffffff !important;
  font-weight: 600 !important;
  font-size: 0.88rem !important;
  border-radius: var(--bt-radius-sm) !important;
  cursor: pointer !important;
  text-decoration: none !important;
  transition: all 0.2s ease !important;
}
.bt-btn-demo:hover {
  background: rgba(255, 255, 255, 0.16) !important;
  border-color: rgba(255, 255, 255, 0.4) !important;
}

/* ==========================================================================
   2026 10/10 MASTERPIECE EXTENSIONS:
   INTERACTIVE PRODUCT DEMOS, SLIDING 3-CARD SHOWCASE & VIDEO STAGE
   ========================================================================== */

/* Google Fonts & Typographic Hierarchy */
body, button, input, select, textarea {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif !important;
}
h1, h2, h3, h4, h5, h6, .bt-hero-headline, .bt-section-title, .bt-prod-title, .bt-role-title, .bt-vault-title {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif !important;
  letter-spacing: -0.025em;
}
code, pre, .bt-font-mono, .bt-terminal-title, .bt-fm-bar-expr, .bt-clk-notice-text, .bt-pulse-dot + span {
  font-family: 'JetBrains Mono', monospace !important;
}

/* --------------------------------------------------------------------------
   A. FormulaMapper Live Precedent Audit Simulator
   -------------------------------------------------------------------------- */
.bt-fm-simulator {
  background: #080c14;
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--bt-radius-lg);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8), 0 0 35px -5px rgba(56, 189, 248, 0.15);
  overflow: hidden;
  position: relative;
}
.bt-fm-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: rgba(15, 23, 42, 0.7);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.bt-fm-status-pill {
  font-family: var(--bt-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: #38bdf8;
  letter-spacing: 0.08em;
  background: rgba(56, 189, 248, 0.1);
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
  border: 1px solid rgba(56, 189, 248, 0.25);
}

/* Formula Bar */
.bt-fm-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 1.25rem;
  background: #0d1322;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.bt-fm-fx-icon {
  font-family: var(--bt-font-mono);
  font-weight: 800;
  font-style: italic;
  color: #94a3b8;
  font-size: 0.9rem;
  padding: 0.2rem 0.45rem;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 4px;
}
.bt-fm-cell-tag {
  font-family: var(--bt-font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  color: #38bdf8;
  padding: 0.25rem 0.6rem;
  background: rgba(56, 189, 248, 0.12);
  border-radius: 4px;
  border: 1px solid rgba(56, 189, 248, 0.3);
}
.bt-fm-bar-expr {
  font-family: var(--bt-font-mono);
  font-size: 0.84rem;
  color: #f8fafc;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.bt-fm-bar-expr .fn { color: #60a5fa; font-weight: 700; }
.bt-fm-bar-expr .ref { color: #34d399; }
.bt-fm-bar-expr .op { color: #f59e0b; }

/* Interactive Cells Selector Buttons */
.bt-fm-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: rgba(13, 19, 34, 0.5);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.bt-fm-preset-btn {
  font-family: var(--bt-font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #cbd5e1;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.bt-fm-preset-btn:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.3);
  color: #38bdf8;
}
.bt-fm-preset-btn.active {
  background: #38bdf8;
  color: #020617;
  font-weight: 700;
  border-color: #38bdf8;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

/* Mini Spreadsheet Sheet Grid */
.bt-fm-sheet-wrap {
  padding: 1rem 1.25rem;
  overflow-x: auto;
}
.bt-fm-sheet {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--bt-font-mono);
  font-size: 0.78rem;
}
.bt-fm-sheet th, .bt-fm-sheet td {
  padding: 0.5rem 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.06);
  text-align: right;
  white-space: nowrap;
}
.bt-fm-sheet th {
  background: rgba(255, 255, 255, 0.03);
  color: #64748b;
  font-weight: 600;
  text-align: center;
}
.bt-fm-sheet td.col-header {
  text-align: left;
  color: #94a3b8;
}
.bt-fm-sheet td.cell-clickable {
  cursor: pointer;
  transition: all 0.15s ease;
  color: #f1f5f9;
}
.bt-fm-sheet td.cell-clickable:hover {
  background: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
}
.bt-fm-sheet td.cell-active {
  background: rgba(56, 189, 248, 0.22) !important;
  color: #38bdf8 !important;
  font-weight: 700;
  box-shadow: inset 0 0 0 1.5px #38bdf8, 0 0 12px rgba(56, 189, 248, 0.35);
}
.bt-fm-sheet td.cell-precedent {
  background: rgba(16, 185, 129, 0.15) !important;
  color: #34d399 !important;
  box-shadow: inset 0 0 0 1px #10b981;
}
.bt-fm-sheet td.cell-danger {
  background: rgba(239, 68, 68, 0.2) !important;
  color: #f87171 !important;
  box-shadow: inset 0 0 0 1.5px #ef4444;
}

/* Precedent Tree Visualizer Box */
.bt-fm-tree-stage {
  padding: 1rem 1.25rem;
  background: rgba(6, 10, 18, 0.85);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.bt-fm-tree-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}
.bt-fm-tree-title span {
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: #94a3b8;
  letter-spacing: 0.06em;
}
.bt-fm-tree-nodes {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
  padding: 0.85rem;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
}
.bt-fm-node {
  padding: 0.45rem 0.8rem;
  border-radius: 6px;
  font-family: var(--bt-font-mono);
  font-size: 0.76rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.bt-fm-node-source {
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34d399;
}
.bt-fm-node-fn {
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #38bdf8;
}
.bt-fm-node-target {
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.4);
  color: #818cf8;
  font-weight: 700;
}
.bt-fm-node-danger {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.4);
  color: #f87171;
}
.bt-fm-arrow {
  color: #64748b;
  font-size: 1rem;
}

/* Audit Telemetry Strip */
.bt-fm-telemetry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.25rem;
  background: #070a10;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-family: var(--bt-font-mono);
  font-size: 0.74rem;
}
.bt-fm-score-good {
  color: #10b981;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.bt-fm-score-warn {
  color: #ef4444;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* --------------------------------------------------------------------------
   B. Freelancer Cash Lock Kit Interactive Scope & Penalty Calculator
   -------------------------------------------------------------------------- */
.bt-clk-calc-wrap {
  background: #0a0d16;
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--bt-radius-lg);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8), 0 0 35px -5px rgba(245, 158, 11, 0.15);
  overflow: hidden;
  padding: 1.75rem;
}
.bt-clk-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
@media (max-width: 860px) {
  .bt-clk-grid {
    grid-template-columns: 1fr;
  }
}

/* Inputs & Sliders Column */
.bt-clk-input-col {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.bt-clk-slider-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.5rem;
}
.bt-clk-label {
  font-family: var(--bt-font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  color: #f59e0b;
  letter-spacing: 0.06em;
}
.bt-clk-val {
  font-family: var(--bt-font-mono);
  font-size: 1.05rem;
  font-weight: 800;
  color: #ffffff;
}
.bt-clk-range-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 9999px;
  outline: none;
  transition: all 0.2s;
}
.bt-clk-range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #f59e0b;
  cursor: pointer;
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.6);
  border: 2px solid #fff;
}
.bt-clk-range-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #f59e0b;
  cursor: pointer;
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.6);
  border: 2px solid #fff;
}

/* Toggle Checkboxes */
.bt-clk-toggle-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  background: rgba(255, 255, 255, 0.03);
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}
.bt-clk-checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  cursor: pointer;
  font-size: 0.82rem;
  color: #cbd5e1;
  line-height: 1.4;
  user-select: none;
}
.bt-clk-checkbox-label input[type="checkbox"] {
  accent-color: #f59e0b;
  width: 16px;
  height: 16px;
  margin-top: 0.15rem;
  cursor: pointer;
}

/* Tally & Live Letter Output Column */
.bt-clk-output-col {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.bt-clk-tally-card {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: 12px;
  padding: 1.25rem;
}
.bt-clk-tally-line {
  display: flex;
  justify-content: space-between;
  font-size: 0.84rem;
  color: #cbd5e1;
  margin-bottom: 0.45rem;
}
.bt-clk-tally-line strong {
  font-family: var(--bt-font-mono);
  color: #ffffff;
}
.bt-clk-tally-total {
  border-top: 1px solid rgba(245, 158, 11, 0.25);
  padding-top: 0.75rem;
  margin-top: 0.5rem;
  font-size: 1rem;
  font-weight: 700;
  color: #f59e0b;
}
.bt-clk-tally-total strong {
  font-family: var(--bt-font-mono);
  font-size: 1.4rem;
  color: #f59e0b;
}

/* Formal Statutory Letter Preview */
.bt-clk-notice-box {
  background: #06080e;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.bt-clk-notice-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.bt-clk-notice-tag {
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: #f59e0b;
  letter-spacing: 0.08em;
}
.bt-clk-notice-text {
  font-family: var(--bt-font-mono);
  font-size: 0.74rem;
  line-height: 1.55;
  color: #94a3b8;
  background: rgba(0, 0, 0, 0.4);
  padding: 0.85rem;
  border-radius: 6px;
  max-height: 160px;
  overflow-y: auto;
  white-space: pre-wrap;
  border: 1px solid rgba(255, 255, 255, 0.04);
}
.bt-clk-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.85rem;
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.35);
  border-radius: 6px;
  color: #f59e0b;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  align-self: flex-start;
}
.bt-clk-copy-btn:hover {
  background: #f59e0b;
  color: #000;
}

/* --------------------------------------------------------------------------
   C. 3-Card Sliding Showcase Carousel Deck
   -------------------------------------------------------------------------- */
.bt-tools-deck-viewport {
  position: relative;
  overflow: hidden;
  width: 100%;
  margin-top: 1.5rem;
}
.bt-tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  transition: opacity 0.25s ease, transform 0.25s ease;
}
@media (max-width: 1080px) {
  .bt-tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 640px) {
  .bt-tools-grid {
    grid-template-columns: 1fr;
  }
}

.bt-tool-card {
  display: flex;
  flex-direction: column;
  background: rgba(16, 22, 34, 0.75);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--bt-radius-md);
  padding: 1.4rem;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  position: relative;
  overflow: hidden;
}
.bt-tool-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.4);
  background: rgba(22, 30, 48, 0.85);
  box-shadow: 0 20px 40px -10px rgba(56, 189, 248, 0.18);
}
.bt-tool-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.85rem;
}
.bt-tool-cat-pill {
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
  border: 1px solid transparent;
}
.cat-finance { background: rgba(245, 158, 11, 0.12); color: #f59e0b; border-color: rgba(245, 158, 11, 0.25); }
.cat-media { background: rgba(236, 72, 153, 0.12); color: #f472b6; border-color: rgba(236, 72, 153, 0.25); }
.cat-web { background: rgba(59, 130, 246, 0.12); color: #60a5fa; border-color: rgba(59, 130, 246, 0.25); }
.cat-privacy { background: rgba(16, 185, 129, 0.12); color: #34d399; border-color: rgba(16, 185, 129, 0.25); }
.cat-productivity { background: rgba(168, 85, 247, 0.12); color: #c084fc; border-color: rgba(168, 85, 247, 0.25); }

.bt-tool-wasm-pill {
  font-family: var(--bt-font-mono);
  font-size: 0.68rem;
  color: #38bdf8;
  font-weight: 600;
}

/* Micro UI Graphic on Tool Card */
.bt-tool-micro-ui {
  height: 64px;
  background: rgba(10, 14, 22, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  color: #94a3b8;
  position: relative;
  overflow: hidden;
}
.bt-tool-micro-ui svg {
  stroke: #38bdf8;
  opacity: 0.8;
}

.bt-tool-card-body {
  flex: 1;
  margin-bottom: 1.25rem;
}
.bt-tool-name {
  font-size: 1.12rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.45rem;
  line-height: 1.35;
}
.bt-tool-desc {
  font-size: 0.85rem;
  color: var(--bt-text-secondary);
  line-height: 1.5;
}

.bt-tool-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.bt-tool-subtag {
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  color: #64748b;
}
.bt-tool-launch-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: #38bdf8;
  transition: gap 0.2s ease;
}
.bt-tool-card:hover .bt-tool-launch-btn {
  gap: 0.6rem;
  color: #60a5fa;
}

/* Dots & Controls */
.bt-carousel-header-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}
.bt-pagination-dots {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}
.bt-dot {
  width: 8px;
  height: 8px;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: all 0.2s;
}
.bt-dot.active {
  width: 24px;
  background: #38bdf8;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.5);
}
.bt-carousel-arrows {
  display: flex;
  gap: 0.5rem;
}
.bt-carousel-arrow-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}
.bt-carousel-arrow-btn:hover:not(:disabled) {
  background: rgba(56, 189, 248, 0.2);
  border-color: #38bdf8;
  color: #38bdf8;
}
.bt-carousel-arrow-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* --------------------------------------------------------------------------
   D. Video Stage Extensions in Hero
   -------------------------------------------------------------------------- */
#btHeroVideo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: none;
}
#btHeroVideo.active {
  display: block;
}
.bt-video-controls-overlay {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: flex;
  gap: 0.5rem;
  z-index: 5;
}
.bt-video-ctrl-btn {
  padding: 0.35rem 0.65rem;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  color: #fff;
  font-size: 0.72rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.bt-video-ctrl-btn:hover {
  background: rgba(0, 0, 0, 0.9);
  border-color: #38bdf8;
}

/* ==========================================================================
   E. AMBIENT DYNAMIC BACKGROUND LAYER (Fluid Spatial Energy)
   ========================================================================== */
.bt-ambient-backdrop {
  position: fixed;
  inset: 0;
  z-index: -10;
  pointer-events: none;
  overflow: hidden;
  background: #070a12;
}

.bt-ambient-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  object-fit: cover;
  opacity: 0.20;
  filter: blur(14px) brightness(0.65) saturate(1.4);
  transform: scale(1.10);
}

.bt-ambient-mesh {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle 850px at 12% 18%, rgba(56, 189, 248, 0.18), transparent 70%),
    radial-gradient(circle 950px at 88% 32%, rgba(139, 92, 246, 0.18), transparent 70%),
    radial-gradient(circle 800px at 50% 75%, rgba(16, 185, 129, 0.12), transparent 70%),
    radial-gradient(circle 650px at 82% 85%, rgba(59, 130, 246, 0.16), transparent 70%);
  animation: btMeshDrift 20s ease-in-out infinite alternate;
}

@keyframes btMeshDrift {
  0% { transform: scale(1) translateY(0); filter: hue-rotate(0deg); }
  50% { transform: scale(1.06) translateY(-24px); filter: hue-rotate(20deg); }
  100% { transform: scale(1.02) translateY(18px); filter: hue-rotate(-15deg); }
}

.bt-ambient-grid {
  position: absolute;
  inset: 0;
  opacity: 0.28;
  background-image: radial-gradient(rgba(255, 255, 255, 0.14) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, black 45%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, black 45%, transparent 100%);
}

.bt-section-seam {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(56, 189, 248, 0.3) 25%, rgba(139, 92, 246, 0.3) 75%, transparent 100%);
  margin: 0 auto;
  max-width: var(--bt-max-width);
  opacity: 0.7;
}

/* ==========================================================================
   F. HERO LIFESTYLE & SPATIAL STAGE CAROUSEL
   ========================================================================== */
.bt-hero-stage-container {
  position: relative;
  width: 100%;
  border-radius: var(--bt-radius-lg);
  overflow: hidden;
  background: rgba(13, 18, 32, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 24px 60px -12px rgba(0, 0, 0, 0.7), 0 0 40px rgba(56, 189, 248, 0.12);
  backdrop-filter: blur(20px);
}

.bt-hero-stage-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.1rem;
  background: rgba(10, 14, 24, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.bt-hero-tabs-strip {
  display: flex;
  gap: 0.35rem;
  overflow-x: auto;
}

.bt-hero-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  background: transparent;
  border: 1px solid transparent;
  color: #94a3b8;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.bt-hero-tab-btn:hover {
  color: #f8fafc;
  background: rgba(255, 255, 255, 0.06);
}

.bt-hero-tab-btn.active {
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.35);
}

.bt-hero-viewport {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  min-height: 340px;
  background: #090d16;
  overflow: hidden;
}

.bt-hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.45s ease, visibility 0.45s ease;
}

.bt-hero-slide.active {
  opacity: 1;
  visibility: visible;
  z-index: 2;
}

.bt-hero-slide img, .bt-hero-slide video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.bt-hero-slide-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 0.35rem 0.75rem;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: #38bdf8;
  letter-spacing: 0.05em;
  z-index: 3;
}

.bt-hero-stage-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.1rem;
  background: rgba(10, 14, 24, 0.95);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* ==========================================================================
   G. TOOL CAROUSEL VISUAL THUMBNAILS & DOCK CONTROLS
   ========================================================================== */
.bt-tool-card-thumb {
  position: relative;
  width: 100%;
  height: 124px;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 0.85rem;
  background: #0a0e1a;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.bt-tool-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.bt-tool-card:hover .bt-tool-card-thumb img {
  transform: scale(1.06);
}

.bt-tool-thumb-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  font-family: var(--bt-font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  background: rgba(10, 15, 28, 0.88);
  backdrop-filter: blur(8px);
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #38bdf8;
}

.bt-tool-selector-wrap {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.bt-tool-selector-label {
  font-family: var(--bt-font-mono);
  font-size: 0.72rem;
  color: #94a3b8;
  white-space: nowrap;
}

.bt-tool-select-dropdown {
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(56, 189, 248, 0.4);
  border-radius: 8px;
  color: #f8fafc;
  padding: 0.45rem 0.85rem;
  font-size: 0.82rem;
  font-family: var(--bt-font-mono);
  outline: none;
  cursor: pointer;
  max-width: 340px;
  transition: all 0.2s ease;
}

.bt-tool-select-dropdown:hover, .bt-tool-select-dropdown:focus {
  border-color: #38bdf8;
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.3);
}

.bt-tool-preview-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  color: #cbd5e1;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.bt-tool-preview-btn:hover {
  background: rgba(56, 189, 248, 0.18);
  border-color: #38bdf8;
  color: #38bdf8;
}

/* ==========================================================================
   H. MULTI-TOOL RUNNER WIDGETS
   ========================================================================== */
.bt-runner-widget {
  display: none;
}

.bt-runner-widget.active {
  display: block;
}

.bt-calc-row {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.bt-calc-btn-group {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.bt-calc-slab-btn {
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #cbd5e1;
  font-family: var(--bt-font-mono);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.bt-calc-slab-btn:hover {
  background: rgba(255, 255, 255, 0.12);
}

.bt-calc-slab-btn.active {
  background: rgba(245, 158, 11, 0.2);
  border-color: #f59e0b;
  color: #f59e0b;
  font-weight: 700;
}

.bt-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.bt-stat-box {
  background: rgba(10, 15, 28, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 0.75rem;
  text-align: center;
}

.bt-stat-num {
  font-family: var(--bt-font-mono);
  font-size: 1.35rem;
  font-weight: 800;
  color: #38bdf8;
  display: block;
}

.bt-stat-label {
  font-size: 0.72rem;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   I. GROWTH KITS PRODUCT MOCKUP COVERS
   ========================================================================== */
.bt-vault-cover-wrap {
  position: relative;
  width: 100%;
  height: 180px;
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 1.25rem;
  background: #090d16;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.bt-vault-cover-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.bt-vault-card:hover .bt-vault-cover-wrap img {
  transform: scale(1.05);
}

.bt-vault-check-list {
  list-style: none;
  padding: 0;
  margin: 1.1rem 0 1.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.bt-vault-check-item {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  font-size: 0.85rem;
  color: #cbd5e1;
  line-height: 1.45;
}

.bt-vault-check-item svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: #10b981;
}

/* Stabilized anti-jitter styling for Freelancer Cash Lock Calculator */
.bt-clk-calc-wrap, .bt-clk-input-col, .bt-clk-output-col, .bt-clk-tally-card {
  contain: layout;
}

.bt-clk-val, .bt-clk-tally-line strong, .bt-clk-tally-total strong {
  font-variant-numeric: tabular-nums;
}

.bt-clk-notice-text {
  height: 160px;
  min-height: 160px;
  max-height: 160px;
  box-sizing: border-box;
}