:root,
html[data-theme="dark"] {
  /* High-Contrast Dark Slate + VIET HAN Deep Navy Palette (Default) */
  --bg-canvas: #080a0f;
  --bg-surface: #0e121b;
  --bg-surface-elevated: #141a27;
  --bg-glass: rgba(14, 18, 27, 0.85);

  --navy-viethan: #1d3564;
  --navy-accent: #2b4c8c;
  --gray-viethan: #404040;

  /* Precision Hairline Borders */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.2);
  --border-highlight: rgba(56, 189, 248, 0.45);

  /* Text Hierarchy */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Vibrant Status & Tag Accents */
  --accent-emerald: #10b981;
  --accent-emerald-bg: rgba(16, 185, 129, 0.12);
  --accent-amber: #f59e0b;
  --accent-amber-bg: rgba(245, 158, 11, 0.12);
  --accent-purple: #a855f7;
  --accent-purple-bg: rgba(168, 85, 247, 0.12);
  --accent-cyan: #38bdf8;
  --accent-cyan-bg: rgba(56, 189, 248, 0.12);
  --accent-orange: #f97316;

  /* Body background gradients */
  --radial-bg-1: radial-gradient(ellipse 80% 50% at 50% -15%, rgba(29, 53, 100, 0.55), transparent);
  --radial-bg-2: radial-gradient(circle at 85% 20%, rgba(56, 189, 248, 0.07), transparent 40%);
  --grid-line-color: rgba(255, 255, 255, 0.025);
  --card-bg-gradient: linear-gradient(180deg, rgba(20, 26, 39, 0.85) 0%, rgba(12, 16, 24, 0.95) 100%);
  --card-shadow-inner: inset 0 1px 0 0 rgba(255, 255, 255, 0.08);
  --card-shadow-hover: inset 0 1px 0 0 rgba(255, 255, 255, 0.16), 0 20px 40px -15px rgba(0, 0, 0, 0.7);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --container-max: 1240px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --transition: 220ms cubic-bezier(0.16, 1, 0.3, 1);
}

html[data-theme="light"] {
  /* Light Crisp Corporate Slate Palette */
  --bg-canvas: #f4f6fa;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f8fafc;
  --bg-glass: rgba(255, 255, 255, 0.92);

  --navy-viethan: #1d3564;
  --navy-accent: #2b4c8c;
  --gray-viethan: #475569;

  --border-subtle: rgba(29, 53, 100, 0.12);
  --border-hover: rgba(29, 53, 100, 0.28);
  --border-highlight: rgba(29, 53, 100, 0.6);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;

  --accent-emerald: #059669;
  --accent-emerald-bg: rgba(5, 150, 105, 0.1);
  --accent-amber: #d97706;
  --accent-amber-bg: rgba(217, 119, 6, 0.1);
  --accent-purple: #9333ea;
  --accent-purple-bg: rgba(147, 51, 234, 0.1);
  --accent-cyan: #0284c7;
  --accent-cyan-bg: rgba(2, 132, 199, 0.1);
  --accent-orange: #ea580c;

  --radial-bg-1: radial-gradient(ellipse 80% 50% at 50% -15%, rgba(29, 53, 100, 0.12), transparent);
  --radial-bg-2: radial-gradient(circle at 85% 20%, rgba(56, 189, 248, 0.12), transparent 45%);
  --grid-line-color: rgba(29, 53, 100, 0.04);
  --card-bg-gradient: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  --card-shadow-inner: 0 4px 20px rgba(0, 0, 0, 0.04);
  --card-shadow-hover: 0 16px 36px -10px rgba(29, 53, 100, 0.14);
}

html[data-theme="navy"] {
  /* Deep Navy Classic Palette */
  --bg-canvas: #091224;
  --bg-surface: #101e38;
  --bg-surface-elevated: #162a4d;
  --bg-glass: rgba(16, 30, 56, 0.88);

  --navy-viethan: #254580;
  --navy-accent: #38bdf8;
  --gray-viethan: #64748b;

  --border-subtle: rgba(56, 189, 248, 0.15);
  --border-hover: rgba(56, 189, 248, 0.35);
  --border-highlight: rgba(56, 189, 248, 0.65);

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;

  --radial-bg-1: radial-gradient(ellipse 80% 50% at 50% -15%, rgba(43, 76, 140, 0.6), transparent);
  --radial-bg-2: radial-gradient(circle at 85% 20%, rgba(56, 189, 248, 0.12), transparent 40%);
  --grid-line-color: rgba(255, 255, 255, 0.035);
  --card-bg-gradient: linear-gradient(180deg, rgba(22, 42, 77, 0.9) 0%, rgba(13, 24, 46, 0.95) 100%);
  --card-shadow-inner: inset 0 1px 0 0 rgba(255, 255, 255, 0.12);
  --card-shadow-hover: inset 0 1px 0 0 rgba(56, 189, 248, 0.25), 0 20px 40px -15px rgba(0, 0, 0, 0.7);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  background-color: var(--bg-canvas);
  background-image: var(--radial-bg-1), var(--radial-bg-2);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

/* Precision Engineering Dot/Grid Matrix */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--grid-line-color) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line-color) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 75% 60% at 50% 15%, black 30%, transparent 85%);
  pointer-events: none;
  z-index: 0;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ==========================================
   NAVIGATION BAR (Linear / Raycast Style)
   ========================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition), border-color var(--transition);
}

/* Theme Switcher in Navigation */
.theme-switcher {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  padding: 3px;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.theme-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.74rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.theme-btn:hover {
  color: var(--text-primary);
}

.theme-btn.active {
  background: var(--navy-viethan);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

.nav-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.viethan-logo-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #f8fafc;
  padding: 5px 11px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.35);
  transition: transform var(--transition);
}

.brand-logo:hover .viethan-logo-box {
  transform: translateY(-1px);
}

.viethan-logo-img {
  height: 26px;
  width: auto;
  display: block;
}

.brand-divider {
  width: 1px;
  height: 24px;
  background: var(--border-subtle);
}

.brand-meta {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-title {
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--accent-cyan);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 7px 14px;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-link .num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

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

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

.btn-version-switch {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.03);
  transition: all var(--transition);
}

.btn-version-switch:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 9px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
}

.btn-primary {
  background: #f8fafc;
  color: #090b10;
  box-shadow: 0 4px 18px rgba(248, 250, 252, 0.16);
}

.btn-primary:hover {
  background: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(248, 250, 252, 0.24);
}

.btn-navy {
  background: linear-gradient(135deg, var(--navy-viethan) 0%, #254580 100%);
  color: #ffffff;
  border-color: rgba(56, 189, 248, 0.35);
  box-shadow: 0 4px 16px rgba(29, 53, 100, 0.45);
}

.btn-navy:hover {
  transform: translateY(-1px);
  border-color: var(--accent-cyan);
  filter: brightness(1.08);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.mobile-menu-btn {
  display: none;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: 8px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* ==========================================
   SECTION HEADER INDICATOR ("01/", "02/", "03/")
   ========================================== */
.section-index-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.index-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: var(--accent-cyan-bg);
  border: 1px solid rgba(56, 189, 248, 0.28);
  padding: 3px 10px;
  border-radius: 6px;
}

.index-label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.index-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border-subtle), transparent);
}

/* ==========================================
   01/ HERO SECTION
   ========================================== */
.hero {
  padding: 76px 0 64px;
  text-align: center;
}

.hero-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(29, 53, 100, 0.45);
  border: 1px solid rgba(56, 189, 248, 0.25);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #e2e8f0;
  margin-bottom: 26px;
}

.hero-badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
}

.hero-title {
  font-size: clamp(2rem, 3.8vw, 3.25rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  background: linear-gradient(180deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-title .accent {
  background: linear-gradient(135deg, #60a5fa 0%, #38bdf8 50%, #f97316 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-tagline {
  font-size: clamp(1.05rem, 1.45vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 660px;
  margin-bottom: 34px;
  font-weight: 400;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

/* Supported Platforms Bar in Hero */
.hero-platforms {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 12px;
  background: rgba(14, 18, 27, 0.85);
  border: 1px solid var(--border-subtle);
}

.hero-platforms-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  padding-right: 8px;
  border-right: 1px solid var(--border-subtle);
}

.platform-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.03);
}

/* ==========================================
   02/ GRID LINEUP (Equal-Sized 2x2 Bento Grid)
   ========================================== */
.lineup-section {
  padding: 36px 0 88px;
}

.section-header-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 32px;
}

.section-heading {
  font-size: clamp(1.75rem, 2.8vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  background: var(--bg-surface);
  padding: 5px;
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
}

.filter-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 6px 13px;
  border-radius: 7px;
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover {
  color: var(--text-primary);
}

.filter-btn.active {
  background: var(--navy-viethan);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(29, 53, 100, 0.5);
}

/* Strictly Equal-Sized 2x2 Product Grid */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-auto-rows: 1fr;
  gap: 24px;
  align-items: stretch;
}

.bento-card {
  position: relative;
  height: 100%;
  background: var(--card-bg-gradient);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  box-shadow: var(--card-shadow-inner);
  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition),
    background var(--transition);
}

.bento-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    480px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
    rgba(56, 189, 248, 0.09),
    transparent 40%
  );
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.bento-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-highlight);
  box-shadow: var(--card-shadow-hover);
}

.bento-card:hover::before {
  opacity: 1;
}

/* Card Header: Index Number + App Icon + Status Tag */
.card-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.card-identity {
  display: flex;
  align-items: center;
  gap: 12px;
}

.product-index {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
}

.app-icon-box {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--navy-viethan) 0%, #162038 100%);
  border: 1px solid rgba(255, 255, 255, 0.14);
  display: grid;
  place-items: center;
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* Status Tags ("Production", "Early Alpha", "In Development") */
.status-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}

.status-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.status-live {
  color: var(--accent-emerald);
  background: var(--accent-emerald-bg);
  border: 1px solid rgba(16, 185, 129, 0.35);
}
.status-live::before {
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
}

.status-alpha {
  color: var(--accent-amber);
  background: var(--accent-amber-bg);
  border: 1px solid rgba(245, 158, 11, 0.35);
}
.status-alpha::before {
  background: var(--accent-amber);
}

.status-dev {
  color: var(--accent-purple);
  background: var(--accent-purple-bg);
  border: 1px solid rgba(168, 85, 247, 0.35);
}
.status-dev::before {
  background: var(--accent-purple);
}

/* App Title & Equal-Height Description */
.card-meta {
  margin-bottom: 16px;
}

.app-title {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.app-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  min-height: 2.95rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* App Window UI Preview Frame inside Card */
.app-window-preview {
  position: relative;
  width: 100%;
  height: 215px;
  border-radius: var(--radius-md);
  background: #070a12;
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  margin-bottom: 18px;
  display: block;
  text-decoration: none;
}

.app-window-preview svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 350ms cubic-bezier(0.16, 1, 0.3, 1);
}

.bento-card:hover .app-window-preview svg {
  transform: scale(1.025);
}

/* Card Footer: Platform Badges + Action Buttons */
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.platform-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.platform-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  padding: 3px 9px;
  border-radius: 6px;
}

.card-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-card {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--text-primary);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-card:hover {
  background: var(--navy-viethan);
  border-color: var(--accent-cyan);
}

.btn-card-primary {
  background: var(--navy-viethan);
  border-color: rgba(56, 189, 248, 0.38);
  color: #ffffff;
}

.btn-card-primary:hover {
  background: var(--navy-accent);
  border-color: var(--accent-cyan);
}

/* ==========================================
   03/ PRINCIPLES & FEATURES SECTION
   ========================================== */
.principles-section {
  padding: 20px 0 96px;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  margin-top: 28px;
}

.principle-card {
  background: var(--card-bg-gradient);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--card-shadow-inner);
  transition: border-color var(--transition), transform var(--transition), background var(--transition), box-shadow var(--transition);
}

.principle-card:hover {
  border-color: rgba(56, 189, 248, 0.35);
  transform: translateY(-3px);
}

.principle-num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--accent-cyan);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.principle-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.principle-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.principle-list li {
  position: relative;
  padding-left: 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.principle-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-weight: 700;
}

/* ==========================================
   MODAL
   ========================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(5, 8, 15, 0.8);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-panel {
  width: 100%;
  max-width: 540px;
  background: #111726;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.modal-close {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 32px;
  height: 32px;
  border-radius: 8px;
  cursor: pointer;
}

.cli-snippet {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  background: #080b12;
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.copy-btn {
  background: var(--navy-viethan);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 5px 10px;
  border-radius: 6px;
  cursor: pointer;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 36px 0;
  background: var(--bg-surface);
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: background var(--transition), border-color var(--transition);
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-credit-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: #ffffff;
  background: linear-gradient(135deg, var(--navy-viethan) 0%, var(--gray-viethan) 100%);
  border: 1px solid rgba(56, 189, 248, 0.35);
  padding: 6px 14px;
  border-radius: 999px;
}

/* ==========================================
   RESPONSIVE BREAKPOINTS
   ========================================== */
@media (max-width: 1024px) {
  .principles-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: #0e121b;
    padding: 16px;
    border-bottom: 1px solid var(--border-subtle);
  }

  .nav-links.mobile-open {
    display: flex;
  }

  .mobile-menu-btn {
    display: inline-flex;
  }

  .bento-grid,
  .principles-grid {
    grid-template-columns: 1fr;
  }
}