/* ==========================================================================
   Bukaake Landing Page — Design System & Stylesheet
   Ultra-Clean Crystal Glass System · Stroke-Free Philosophy
   Deep Obsidian Dark & Soft Slate Light Theme Engine
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens (Directly Aligned with Bukaake tokens.css)
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette (Deep Obsidian Dark Default) */
  --bg-core: #06070a;
  --bg-deep: #090c13;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --bg-island: rgba(14, 18, 27, 0.92);
  --bg-pill: rgba(255, 255, 255, 0.07);
  --bg-pill-hover: rgba(255, 255, 255, 0.12);

  /* Cyan & Electric Highlights */
  --accent-cyan: #00e5ff;
  --accent-cyan-glow: rgba(0, 229, 255, 0.25);
  --accent-indigo: #6366f1;
  --accent-danger: #ef4444;

  /* Typography */
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-dark-btn: #090c13;

  /* Zero-Stroke Frosted Glass Shadows */
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.65);
  --shadow-cyan: 0 0 24px rgba(0, 229, 255, 0.20), 0 10px 30px rgba(0, 0, 0, 0.45);

  /* Ambient Canvas Radial Lighting */
  --body-radial-1: #111726;
  --body-radial-2: #0d1222;
  --body-bloom: rgba(0, 229, 255, 0.08);

  /* Unified Buttons */
  --btn-primary-bg: #ffffff;
  --btn-primary-text: #090c13;
  --btn-primary-hover: #f8fafc;
  --btn-primary-shadow: var(--shadow-cyan);

  --btn-secondary-bg: rgba(255, 255, 255, 0.08);
  --btn-secondary-text: #ffffff;
  --btn-secondary-hover: rgba(255, 255, 255, 0.14);

  /* Comparison Section Inner Boxes */
  --trash-box-bg: rgba(239, 68, 68, 0.08);
  --trash-desc-color: #cbd5e1;
  --bukaake-box-bg: rgba(0, 229, 255, 0.07);

  /* Keyboard Shortcuts & Dividers */
  --kbd-bg: rgba(255, 255, 255, 0.10);
  --kbd-text: #ffffff;
  --border-subtle: rgba(255, 255, 255, 0.06);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 9999px;

  /* Transitions */
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.18s var(--ease-smooth);
  --transition-normal: 0.28s var(--ease-smooth);

  /* Layout */
  --container-max: 1180px;
}

/* --------------------------------------------------------------------------
   Light Theme Tokens (Pillar 2: Frosted Slate · Strict Zero Pure Black)
   -------------------------------------------------------------------------- */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg-core: #f5f7fa;
    --bg-deep: #ebf0f5;
    --bg-card: rgba(255, 255, 255, 0.88);
    --bg-card-hover: rgba(255, 255, 255, 0.98);
    --bg-island: rgba(255, 255, 255, 0.94);
    --bg-pill: rgba(26, 32, 44, 0.06);
    --bg-pill-hover: rgba(26, 32, 44, 0.11);

    --accent-cyan: #0284c7;
    --accent-cyan-glow: rgba(2, 132, 199, 0.18);
    --accent-indigo: #4f46e5;
    --accent-danger: #dc2626;

    --text-main: #242938;
    --text-muted: #535c73;
    --text-dim: #7e879f;
    --text-dark-btn: #ffffff;

    --shadow-sm: 0 4px 14px rgba(26, 32, 44, 0.04);
    --shadow-md: 0 8px 24px rgba(26, 32, 44, 0.06);
    --shadow-lg: 0 14px 36px rgba(26, 32, 44, 0.10);
    --shadow-cyan: 0 0 20px rgba(2, 132, 199, 0.16), 0 8px 24px rgba(26, 32, 44, 0.08);

    --body-radial-1: #e9eef5;
    --body-radial-2: #e2e8f0;
    --body-bloom: rgba(2, 132, 199, 0.06);

    --btn-primary-bg: #242938;
    --btn-primary-text: #ffffff;
    --btn-primary-hover: #32394d;
    --btn-primary-shadow: 0 4px 14px rgba(36, 41, 56, 0.25);

    --btn-secondary-bg: rgba(26, 32, 44, 0.06);
    --btn-secondary-text: #242938;
    --btn-secondary-hover: rgba(26, 32, 44, 0.10);

    --trash-box-bg: rgba(239, 68, 68, 0.07);
    --trash-desc-color: #4b5563;
    --bukaake-box-bg: rgba(2, 132, 199, 0.07);

    --kbd-bg: rgba(26, 32, 44, 0.08);
    --kbd-text: #242938;

    --border-subtle: rgba(26, 32, 44, 0.08);
  }
}

html[data-theme="light"] {
  --bg-core: #f5f7fa;
  --bg-deep: #ebf0f5;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-island: rgba(255, 255, 255, 0.94);
  --bg-pill: rgba(26, 32, 44, 0.06);
  --bg-pill-hover: rgba(26, 32, 44, 0.11);

  --accent-cyan: #0284c7;
  --accent-cyan-glow: rgba(2, 132, 199, 0.18);
  --accent-indigo: #4f46e5;
  --accent-danger: #dc2626;

  --text-main: #242938;
  --text-muted: #535c73;
  --text-dim: #7e879f;
  --text-dark-btn: #ffffff;

  --shadow-sm: 0 4px 14px rgba(26, 32, 44, 0.04);
  --shadow-md: 0 8px 24px rgba(26, 32, 44, 0.06);
  --shadow-lg: 0 14px 36px rgba(26, 32, 44, 0.10);
  --shadow-cyan: 0 0 20px rgba(2, 132, 199, 0.16), 0 8px 24px rgba(26, 32, 44, 0.08);

  --body-radial-1: #e9eef5;
  --body-radial-2: #e2e8f0;
  --body-bloom: rgba(2, 132, 199, 0.06);

  --btn-primary-bg: #242938;
  --btn-primary-text: #ffffff;
  --btn-primary-hover: #32394d;
  --btn-primary-shadow: 0 4px 14px rgba(36, 41, 56, 0.25);

  --btn-secondary-bg: rgba(26, 32, 44, 0.06);
  --btn-secondary-text: #242938;
  --btn-secondary-hover: rgba(26, 32, 44, 0.10);

  --trash-box-bg: rgba(239, 68, 68, 0.07);
  --trash-desc-color: #4b5563;
  --bukaake-box-bg: rgba(2, 132, 199, 0.07);

  --kbd-bg: rgba(26, 32, 44, 0.08);
  --kbd-text: #242938;

  --border-subtle: rgba(26, 32, 44, 0.08);
}

html[data-theme="dark"] {
  --bg-core: #06070a;
  --bg-deep: #090c13;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --bg-island: rgba(14, 18, 27, 0.92);
  --bg-pill: rgba(255, 255, 255, 0.07);
  --bg-pill-hover: rgba(255, 255, 255, 0.12);

  --accent-cyan: #00e5ff;
  --accent-cyan-glow: rgba(0, 229, 255, 0.25);
  --accent-indigo: #6366f1;
  --accent-danger: #ef4444;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-dark-btn: #090c13;

  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.65);
  --shadow-cyan: 0 0 24px rgba(0, 229, 255, 0.20), 0 10px 30px rgba(0, 0, 0, 0.45);

  --body-radial-1: #111726;
  --body-radial-2: #0d1222;
  --body-bloom: rgba(0, 229, 255, 0.08);

  --btn-primary-bg: #ffffff;
  --btn-primary-text: #090c13;
  --btn-primary-hover: #f8fafc;
  --btn-primary-shadow: var(--shadow-cyan);

  --btn-secondary-bg: rgba(255, 255, 255, 0.08);
  --btn-secondary-text: #ffffff;
  --btn-secondary-hover: rgba(255, 255, 255, 0.14);

  --trash-box-bg: rgba(239, 68, 68, 0.08);
  --trash-desc-color: #cbd5e1;
  --bukaake-box-bg: rgba(0, 229, 255, 0.07);

  --kbd-bg: rgba(255, 255, 255, 0.10);
  --kbd-text: #ffffff;
  --border-subtle: rgba(255, 255, 255, 0.06);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", Helvetica, Arial, sans-serif;
  background-color: var(--bg-core);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: clip;
}

body {
  background: radial-gradient(circle at 50% 0%, var(--body-radial-1) 0%, var(--bg-core) 60%),
              radial-gradient(circle at 10% 80%, var(--body-radial-2) 0%, var(--bg-core) 50%);
  background-attachment: fixed;
  color: var(--text-main);
  overflow-x: clip;
  position: relative;
  min-height: 100vh;
  transition: background var(--transition-normal);
}

/* Subtle background illumination */
body::before {
  content: "";
  position: fixed;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 450px;
  background: radial-gradient(ellipse, var(--body-bloom), transparent 70%);
  pointer-events: none;
  z-index: 0;
  transition: background var(--transition-normal);
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
}

/* Zero focus ring outline policy */
button:focus,
a:focus,
input:focus {
  outline: none !important;
}

.mono {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

/* --------------------------------------------------------------------------
   3. Header & Floating Glass Navbar
   -------------------------------------------------------------------------- */
.header-nav {
  position: sticky;
  top: 16px;
  z-index: 100;
  padding: 0 16px;
  display: flex;
  justify-content: center;
  transition: transform var(--transition-normal);
}

.nav-island {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  max-width: 1060px;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--bg-island);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: var(--shadow-lg);
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: contain;
  transition: transform var(--transition-fast);
}

.brand-wrapper:hover .brand-icon {
  transform: scale(1.06);
}

.brand-text {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-tag {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 2px 7px;
  border-radius: var(--radius-pill);
  background: var(--bukaake-box-bg);
  color: var(--accent-cyan);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-main);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  background: var(--bg-pill);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--bg-pill-hover);
  color: var(--text-main);
  transform: scale(1.05);
}

/* Icon visibility logic */
.theme-icon-sun {
  display: none;
}
.theme-icon-moon {
  display: block;
}

/* When Light Theme is active, show Moon icon to switch to dark */
html[data-theme="light"] .theme-icon-sun {
  display: block;
}
html[data-theme="light"] .theme-icon-moon {
  display: none;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .theme-icon-sun {
    display: block;
  }
  :root:not([data-theme="dark"]) .theme-icon-moon {
    display: none;
  }
}

.nav-github-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  background: var(--bg-pill);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.nav-github-link:hover {
  background: var(--bg-pill-hover);
  color: var(--text-main);
}

.btn-nav-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  font-size: 0.88rem;
  font-weight: 600;
  box-shadow: var(--btn-primary-shadow);
  transition: all var(--transition-fast);
}

.btn-nav-download:hover {
  background: var(--btn-primary-hover);
  transform: translateY(-1px);
}

/* Mobile Nav Toggle Button (Hidden on Desktop) */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  background: var(--bg-pill);
  color: var(--text-muted);
  transition: all var(--transition-fast);
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle:hover {
  background: var(--bg-pill-hover);
  color: var(--text-main);
  transform: scale(1.05);
}

.nav-toggle .icon-close {
  display: none;
}

.nav-toggle.is-active .icon-menu {
  display: none;
}

.nav-toggle.is-active .icon-close {
  display: block;
}

/* --------------------------------------------------------------------------
   4. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: 80px;
  padding-bottom: 70px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 20px;
  border-radius: var(--radius-pill);
  background: var(--bg-pill);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
  cursor: default;
  transition: all var(--transition-fast);
}

.hero-pill-badge:hover {
  background: var(--bg-pill-hover);
  transform: translateY(-1px);
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
}

.badge-text {
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-muted);
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.12;
  margin-bottom: 22px;
  max-width: 900px;
}

.text-gradient {
  background: linear-gradient(135deg, var(--text-main) 40%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-cyan {
  color: var(--accent-cyan);
  -webkit-text-fill-color: var(--accent-cyan);
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 700px;
  margin-bottom: 38px;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  font-size: 1rem;
  font-weight: 700;
  box-shadow: var(--btn-primary-shadow);
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  background: var(--btn-primary-hover);
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: var(--radius-pill);
  background: var(--btn-secondary-bg);
  backdrop-filter: blur(14px);
  color: var(--btn-secondary-text);
  font-size: 1rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--btn-secondary-hover);
  transform: translateY(-2px);
}

.hero-meta-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  color: var(--text-dim);
  font-size: 0.84rem;
  margin-bottom: 50px;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* --------------------------------------------------------------------------
   5. Hero Showcase / Mockup Stage
   -------------------------------------------------------------------------- */
.hero-mockup-wrapper {
  width: 100%;
  max-width: 1060px;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 60px rgba(0, 229, 255, 0.12);
  background: var(--bg-deep);
  transition: transform var(--transition-normal);
}

.hero-mockup-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-lg);
}

/* --------------------------------------------------------------------------
   6. Javanese Linguistic Trivia Callout
   -------------------------------------------------------------------------- */
.trivia-container {
  margin-top: 50px;
  margin-bottom: 70px;
}

.trivia-card {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 28px 32px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.trivia-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-indigo));
}

.trivia-icon-box {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: var(--bukaake-box-bg);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
}

.trivia-content {
  flex: 1;
}

.trivia-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 6px;
}

.trivia-heading {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.trivia-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.trivia-text strong {
  color: var(--text-main);
}

/* --------------------------------------------------------------------------
   7. "Why Most Image Viewers Are Trash" Section
   (Equalized Inner Box Heights per User Request)
   -------------------------------------------------------------------------- */
.comparison-section {
  padding-top: 60px;
  padding-bottom: 90px;
}

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 3.8vw, 2.9rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.comp-card {
  padding: 24px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.comp-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.comp-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-dim);
  line-height: 1.2;
}

/* Equalized Trash & Bukaake Inner Boxes - Exactly identical heights across ALL cards with zero text clipping */
.comp-side-trash,
.comp-side-bukaake {
  min-height: 175px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  box-sizing: border-box;
}

.comp-side-trash {
  background: var(--trash-box-bg);
}

.comp-side-trash .side-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-danger);
  margin-bottom: 8px;
  flex-shrink: 0;
}

.comp-side-trash .side-desc {
  font-size: 0.88rem;
  color: var(--trash-desc-color);
  line-height: 1.55;
  margin: 0;
}

.comp-side-bukaake {
  background: var(--bukaake-box-bg);
}

.comp-side-bukaake .side-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 8px;
  flex-shrink: 0;
}

.comp-side-bukaake .side-desc {
  font-size: 0.9rem;
  color: var(--text-main);
  line-height: 1.55;
  margin: 0;
}

/* --------------------------------------------------------------------------
   8. Video Demo Showcase Section
   -------------------------------------------------------------------------- */
.video-section {
  padding-top: 50px;
  padding-bottom: 80px;
}

.video-frame-container {
  max-width: 940px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 50px rgba(0, 229, 255, 0.15);
  background: #000000;
  position: relative;
  aspect-ratio: 16 / 9;
}

.video-frame-container iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

.video-caption {
  text-align: center;
  margin-top: 18px;
  font-size: 0.88rem;
  color: var(--text-dim);
}

/* --------------------------------------------------------------------------
   9. Features Deep Dive Grid
   -------------------------------------------------------------------------- */
.features-section {
  padding-top: 60px;
  padding-bottom: 90px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.feature-card {
  padding: 32px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.feature-card-full {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
}

@media (max-width: 900px) {
  .feature-card-full {
    grid-template-columns: 1fr;
  }
}

.feature-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--bg-pill);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
  color: var(--text-main);
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

.feature-img-wrapper {
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-top: auto;
  box-shadow: var(--shadow-sm);
  background: var(--bg-deep);
}

.feature-img {
  width: 100%;
  height: auto;
  display: block;
}

.feature-pills-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-tag-pill {
  font-size: 0.78rem;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: var(--bg-pill);
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   10. Keyboard Shortcuts Interactive Cheatsheet
   -------------------------------------------------------------------------- */
.shortcuts-section {
  padding-top: 60px;
  padding-bottom: 90px;
}

.shortcuts-table-wrapper {
  background: var(--bg-card);
  backdrop-filter: blur(18px);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-md);
  overflow-x: auto;
}

.shortcuts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.shortcut-category-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.shortcut-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.shortcut-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.9rem;
}

.shortcut-desc {
  color: var(--text-muted);
}

.kbd-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 6px;
  background: var(--kbd-bg);
  color: var(--kbd-text);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
  font-weight: 600;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   11. Download Matrix & System Specs
   -------------------------------------------------------------------------- */
.download-section {
  padding-top: 70px;
  padding-bottom: 100px;
  text-align: center;
}

.download-cards-row {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  justify-content: center;
  gap: 24px;
  margin-top: 40px;
  margin-bottom: 40px;
}

.download-card {
  flex: 1;
  min-width: 290px;
  max-width: 420px;
  padding: 36px 30px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.download-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.download-card.primary-download {
  background: var(--bukaake-box-bg);
  box-shadow: 0 0 30px var(--accent-cyan-glow), var(--shadow-md);
}

.download-card.primary-download:hover {
  box-shadow: 0 0 40px var(--accent-cyan-glow), var(--shadow-lg);
}

.dl-arch-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: var(--bg-pill);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.dl-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-main);
}

.dl-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.dl-specs-list {
  list-style: none;
  font-size: 0.86rem;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 28px;
}

.btn-download-card {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 20px;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
  font-weight: 700;
  transition: all var(--transition-fast);
}

.btn-download-card.btn-dl-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  box-shadow: var(--btn-primary-shadow);
}

.btn-download-card.btn-dl-primary:hover {
  background: var(--btn-primary-hover);
  transform: translateY(-1px);
}

.btn-download-card.btn-dl-secondary {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
}

.btn-download-card.btn-dl-secondary:hover {
  background: var(--btn-secondary-hover);
  transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   12. Minimalist Footer
   -------------------------------------------------------------------------- */
.footer-section {
  padding-top: 50px;
  padding-bottom: 60px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  color: var(--text-dim);
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-icon {
  width: 24px;
  height: 24px;
  border-radius: 6px;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.footer-link {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--text-main);
}

.footer-author-link {
  color: var(--text-main);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.footer-author-link:hover {
  color: var(--accent-cyan);
}

/* --------------------------------------------------------------------------
   13. Responsive Breakpoints
   -------------------------------------------------------------------------- */

/* Desktop Squeeze (961px to 1100px) - Tighten spacing to fit on a single line */
@media (max-width: 1100px) and (min-width: 961px) {
  .nav-island {
    padding: 8px 16px;
    gap: 12px;
  }

  .brand-text {
    font-size: 1.05rem;
  }

  .nav-links {
    gap: 12px;
  }

  .nav-link {
    font-size: 0.84rem;
  }

  .nav-actions {
    gap: 8px;
  }

  .btn-nav-download {
    padding: 7px 14px;
    font-size: 0.82rem;
    gap: 6px;
  }
}

/* Tablet & Mobile Navigation (<= 960px) - Sleek Pill + Glassmorphic Drawer */
@media (max-width: 960px) {
  .header-nav {
    top: 12px;
    padding: 0 12px;
  }

  .nav-island {
    position: relative;
    padding: 8px 16px;
    gap: 12px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  /* Dropdown glassmorphic drawer */
  .nav-links {
    display: none;
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 12px;
    background: var(--bg-island);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg), 0 0 24px rgba(0, 229, 255, 0.08);
    border: 1px solid var(--border-subtle);
    gap: 4px;
    z-index: 101;
  }

  .nav-links.is-active {
    display: flex;
    animation: nav-drop 0.22s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  }

  @keyframes nav-drop {
    from {
      opacity: 0;
      transform: translateY(-8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .nav-links li {
    width: 100%;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
    color: var(--text-muted);
    transition: all var(--transition-fast);
  }

  .nav-link:hover {
    background: var(--bg-pill);
    color: var(--accent-cyan);
    padding-left: 18px;
  }
}

@media (max-width: 820px) {
  .hero-section {
    padding-top: 50px;
  }

  .trivia-card {
    flex-direction: column;
    gap: 16px;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: 16px;
  }
}

/* Compact Mobile Fine-Tuning (< 520px) */
@media (max-width: 520px) {
  .brand-tag {
    display: none;
  }

  .brand-text {
    font-size: 1.05rem;
  }

  .nav-island {
    padding: 8px 12px;
  }

  .btn-nav-download {
    padding: 7px 12px;
    font-size: 0.8rem;
  }
}

/* Extra-small screens (< 400px) */
@media (max-width: 400px) {
  .btn-nav-download span {
    display: none;
  }

  .btn-nav-download {
    padding: 8px 10px;
  }

  .nav-actions {
    gap: 6px;
  }
}

/* --------------------------------------------------------------------------
   14. Corner-to-Corner View Transition Reveal Animation
   -------------------------------------------------------------------------- */
::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

::view-transition-old(root) {
  z-index: 1;
}

::view-transition-new(root) {
  z-index: 99999;
}