/* ==========================================================================
   FlaskArchitect.com - Skeuomorphic Precision Design System
   "Building Intelligent Web Applications with Python & Flask"
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties & Variables
   -------------------------------------------------------------------------- */
:root {
  /* Core Amber & Warm Palette */
  --amber-50: #FFFBEB;
  --amber-100: #FEF3C7;
  --amber-200: #FDE68A;
  --amber-300: #FCD34D;
  --amber-400: #FBBF24;
  --amber-500: #F59E0B; /* Primary Accent */
  --amber-600: #D97706;
  --amber-700: #B45309;
  --amber-800: #92400E;
  --amber-900: #78350F;
  --amber-glow: rgba(245, 158, 11, 0.45);
  --amber-glow-strong: 0 0 20px rgba(245, 158, 11, 0.65), 0 0 40px rgba(245, 158, 11, 0.25);

  /* Status Colors */
  --color-emerald: #10B981;
  --color-emerald-glow: rgba(16, 185, 129, 0.4);
  --color-cyan: #06B6D4;
  --color-purple: #A855F7;
  --color-ruby: #EF4444;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, Menlo, Monaco, monospace;

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Default Dark Mode (Warm Dark #1C1917) */
  --bg-primary: #1C1917;
  --bg-secondary: #161412;
  --bg-tertiary: #24201D;
  --bg-elevated: #2B2622;
  --bg-inset: #0F0E0D;
  
  --border-subtle: #38322D;
  --border-highlight: #4A423B;
  --border-active: #F59E0B;

  --text-primary: #F5F5F4;
  --text-secondary: #D6D3D1;
  --text-muted: #A8A29E;
  --text-dim: #78716C;

  /* Skeuomorphic Shadows & Gradients (Dark) */
  --chassis-gradient: linear-gradient(180deg, #2D2723 0%, #1E1A18 100%);
  --plate-gradient: linear-gradient(145deg, #282320, #1B1816);
  --inset-shadow: inset 2px 2px 5px rgba(0, 0, 0, 0.8), inset -1px -1px 3px rgba(255, 255, 255, 0.05);
  --screen-inset: inset 0 3px 8px rgba(0, 0, 0, 0.95), inset 0 0 15px rgba(0, 0, 0, 0.9);
  --btn-raised-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.15), inset 0 -2px 0 rgba(0, 0, 0, 0.4);
  --btn-amber-shadow: 0 4px 12px rgba(245, 158, 11, 0.35), 0 2px 4px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.4), inset 0 -2px 0 rgba(0, 0, 0, 0.3);
  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.7), 0 8px 10px -6px rgba(0, 0, 0, 0.7), inset 0 1px 1px rgba(255, 255, 255, 0.08);
  --dial-shadow: 0 6px 14px rgba(0,0,0,0.6), inset 0 2px 3px rgba(255,255,255,0.15), inset 0 -3px 4px rgba(0,0,0,0.6);
  
  --nav-blur-bg: rgba(28, 25, 23, 0.88);
  --badge-bg: #28231E;
}

/* --------------------------------------------------------------------------
   2. Light Mode Override (Tactile Brushed Aluminum / Precision Cream)
   -------------------------------------------------------------------------- */
[data-theme="light"] {
  --bg-primary: #EBE8E4;
  --bg-secondary: #DFDBD5;
  --bg-tertiary: #F5F3F0;
  --bg-elevated: #FAF9F7;
  --bg-inset: #D3CEC8;

  --border-subtle: #C8C2BA;
  --border-highlight: #FFFFFF;
  --border-active: #D97706;

  --text-primary: #1C1917;
  --text-secondary: #44403C;
  --text-muted: #78716C;
  --text-dim: #A8A29E;

  --chassis-gradient: linear-gradient(180deg, #F5F3F0 0%, #DFDBD5 100%);
  --plate-gradient: linear-gradient(145deg, #FAF8F5, #E5E1DC);
  --inset-shadow: inset 2px 2px 5px rgba(0, 0, 0, 0.18), inset -1px -1px 3px rgba(255, 255, 255, 0.9);
  --screen-inset: inset 0 3px 8px rgba(0, 0, 0, 0.25), inset 0 0 15px rgba(0, 0, 0, 0.15);
  --btn-raised-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.12), 0 2px 4px -2px rgba(0, 0, 0, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.8), inset 0 -2px 0 rgba(0, 0, 0, 0.15);
  --btn-amber-shadow: 0 4px 12px rgba(217, 119, 6, 0.35), 0 2px 4px rgba(0, 0, 0, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.5), inset 0 -2px 0 rgba(0, 0, 0, 0.2);
  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.08), inset 0 1px 1px rgba(255, 255, 255, 0.8);
  --dial-shadow: 0 6px 14px rgba(0,0,0,0.15), inset 0 2px 3px rgba(255,255,255,0.9), inset 0 -3px 4px rgba(0,0,0,0.15);

  --nav-blur-bg: rgba(235, 232, 228, 0.92);
  --badge-bg: #E3DDD6;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  background-image: radial-gradient(rgba(245, 158, 11, 0.04) 1px, transparent 0);
  background-size: 28px 28px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-highlight);
  border-radius: 5px;
  border: 2px solid var(--bg-secondary);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--amber-500);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

img, svg {
  display: block;
  max-width: 100%;
}

code, pre {
  font-family: var(--font-mono);
}

/* --------------------------------------------------------------------------
   4. Skeuomorphic Core UI Components
   -------------------------------------------------------------------------- */

/* Hardware Plates & Panels */
.skeuo-panel {
  background: var(--plate-gradient);
  border: 1px solid var(--border-subtle);
  border-top-color: var(--border-highlight);
  border-radius: 16px;
  box-shadow: var(--card-shadow);
  position: relative;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.skeuo-panel:hover {
  border-color: rgba(245, 158, 11, 0.4);
}

/* Bezel Screws */
.screw {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #78716C, #292524);
  box-shadow: inset 0 1px 1px rgba(0,0,0,0.8), 0 1px 0 rgba(255,255,255,0.2);
  position: absolute;
}
.screw-tl { top: 10px; left: 10px; }
.screw-tr { top: 10px; right: 10px; }
.screw-bl { bottom: 10px; left: 10px; }
.screw-br { bottom: 10px; right: 10px; }

/* Inset Screens / Debossed Wells */
.skeuo-screen {
  background: var(--bg-inset);
  box-shadow: var(--screen-inset);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  position: relative;
  overflow: hidden;
}

.skeuo-screen::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(rgba(18, 16, 14, 0) 50%, rgba(0, 0, 0, 0.25) 50%);
  background-size: 100% 4px;
  pointer-events: none;
  opacity: 0.35;
  z-index: 1;
}

/* Tactile Push Buttons */
.skeuo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 10px;
  cursor: pointer;
  border: 1px solid var(--border-subtle);
  background: var(--plate-gradient);
  color: var(--text-primary);
  box-shadow: var(--btn-raised-shadow);
  transition: all var(--transition-fast);
  user-select: none;
  text-decoration: none;
}

.skeuo-btn:hover {
  border-color: var(--border-highlight);
  transform: translateY(-1px);
}

.skeuo-btn:active {
  transform: translateY(2px);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.6), 0 1px 0 rgba(255, 255, 255, 0.1);
}

/* Primary Amber Button */
.skeuo-btn-amber {
  background: linear-gradient(180deg, #FBBF24 0%, #F59E0B 45%, #D97706 100%);
  color: #1A1308;
  border-color: #B45309;
  border-top-color: #FDE68A;
  box-shadow: var(--btn-amber-shadow);
  font-weight: 700;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
}

.skeuo-btn-amber:hover {
  background: linear-gradient(180deg, #FDE68A 0%, #FBBF24 45%, #D97706 100%);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.7);
  color: #0F0C05;
  transform: translateY(-2px);
}

.skeuo-btn-amber:active {
  transform: translateY(2px);
  box-shadow: inset 0 3px 6px rgba(0, 0, 0, 0.5), 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* Small / Icon Buttons */
.skeuo-btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
  border-radius: 8px;
}

.skeuo-btn-icon {
  width: 42px;
  height: 42px;
  padding: 0;
  border-radius: 10px;
}

/* Glowing LED Indicators */
.led-indicator {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  position: relative;
}

.led-amber {
  background: radial-gradient(circle at 35% 35%, #FFFBEB, #F59E0B 60%, #92400E 100%);
  box-shadow: 0 0 8px rgba(245, 158, 11, 0.9), 0 0 16px rgba(245, 158, 11, 0.5);
  animation: ledPulse 2.5s infinite alternate;
}

.led-emerald {
  background: radial-gradient(circle at 35% 35%, #ECFDF5, #10B981 60%, #065F46 100%);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.9), 0 0 16px rgba(16, 185, 129, 0.5);
  animation: ledPulse 2s infinite alternate;
}

.led-ruby {
  background: radial-gradient(circle at 35% 35%, #FEF2F2, #EF4444 60%, #991B1B 100%);
  box-shadow: 0 0 8px rgba(239, 68, 68, 0.9);
}

@keyframes ledPulse {
  0% { opacity: 0.75; transform: scale(0.96); }
  100% { opacity: 1; transform: scale(1.04); }
}

/* Skeuomorphic Badges */
.skeuo-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-radius: 20px;
  background: var(--badge-bg);
  border: 1px solid var(--border-subtle);
  box-shadow: inset 1px 1px 2px rgba(0, 0, 0, 0.3), 0 1px 0 rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
}

.skeuo-badge-amber {
  color: var(--amber-400);
  border-color: rgba(245, 158, 11, 0.35);
  background: rgba(245, 158, 11, 0.1);
}

.skeuo-badge-emerald {
  color: var(--color-emerald);
  border-color: rgba(16, 185, 129, 0.35);
  background: rgba(16, 185, 129, 0.1);
}

/* --------------------------------------------------------------------------
   5. Navigation Bar
   -------------------------------------------------------------------------- */
.navbar-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: var(--nav-blur-bg);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  transition: all var(--transition-normal);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-logo {
  width: 38px;
  height: 38px;
  filter: drop-shadow(0 2px 6px rgba(245, 158, 11, 0.4));
  transition: transform var(--transition-bounce);
}

.brand-link:hover .brand-logo {
  transform: rotate(-8deg) scale(1.05);
}

.brand-accent {
  color: var(--amber-500);
  text-shadow: 0 0 12px rgba(245, 158, 11, 0.5);
}

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

.nav-item-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: 8px;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.nav-item-link:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border-color: var(--border-subtle);
}

.nav-item-link.active {
  color: var(--amber-400);
  background: var(--bg-tertiary);
  border-color: rgba(245, 158, 11, 0.4);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.4);
}

.nav-item-link.active .nav-dot {
  background: var(--amber-400);
  box-shadow: 0 0 6px var(--amber-400);
}

.nav-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: all var(--transition-fast);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Tactile Theme Toggle Switch */
.theme-switch-btn {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  border: 1px solid var(--border-subtle);
  background: var(--plate-gradient);
  box-shadow: var(--btn-raised-shadow);
  transition: all var(--transition-fast);
}

.theme-switch-btn:hover {
  color: var(--amber-400);
  border-color: var(--amber-500);
}

.theme-switch-btn:active {
  transform: translateY(2px);
  box-shadow: var(--inset-shadow);
}

/* Sound Switch Button */
.sound-toggle-btn {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  border: 1px solid var(--border-subtle);
  background: var(--plate-gradient);
  box-shadow: var(--btn-raised-shadow);
  transition: all var(--transition-fast);
}
.sound-toggle-btn.sound-on {
  color: var(--amber-400);
  border-color: rgba(245, 158, 11, 0.4);
}

/* Mobile Hamburger Button */
.mobile-menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-subtle);
  background: var(--plate-gradient);
  color: var(--text-primary);
  cursor: pointer;
  box-shadow: var(--btn-raised-shadow);
}

.mobile-drawer {
  display: none;
  padding: 16px 24px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

.mobile-drawer.is-open {
  display: block;
}

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

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  font-weight: 600;
  border-radius: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.mobile-nav-link.active {
  border-color: var(--amber-500);
  color: var(--amber-400);
}

/* --------------------------------------------------------------------------
   6. Layout Containers & Section Styling
   -------------------------------------------------------------------------- */
.main-wrapper {
  flex: 1;
  margin-top: 75px;
}

.section-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 24px;
}

.section-container-sm {
  max-width: 960px;
  margin: 0 auto;
  padding: 80px 24px;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   7. Split Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 60px 24px 80px;
  max-width: 1280px;
  margin: 0 auto;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-status-pill {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  background: var(--plate-gradient);
  border: 1px solid var(--border-subtle);
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  box-shadow: var(--btn-raised-shadow);
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.1;
  color: var(--text-primary);
}

.hero-title .text-gradient {
  background: linear-gradient(135deg, #FDE68A 0%, #F59E0B 50%, #D97706 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline;
}

.hero-description {
  font-size: 1.18rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 8px;
}

.hero-metrics-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.metric-dial {
  text-align: left;
}

.metric-dial-val {
  font-size: 1.5rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--amber-400);
}

.metric-dial-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* --------------------------------------------------------------------------
   8. Skeuomorphic Hero Console Device
   -------------------------------------------------------------------------- */
.hero-device-wrapper {
  perspective: 1000px;
}

.hero-device {
  background: var(--chassis-gradient);
  border: 2px solid var(--border-highlight);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.85), 0 0 0 1px rgba(0, 0, 0, 0.9), inset 0 2px 2px rgba(255, 255, 255, 0.15);
  position: relative;
  transform: rotateY(-3deg) rotateX(2deg);
  transition: transform 0.4s ease;
}

.hero-device:hover {
  transform: rotateY(0deg) rotateX(0deg);
}

.device-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 16px;
}

.device-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.device-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.device-telemetry-leds {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Cathode / Frequency Meter Visualizer */
.vu-meter-rack {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 4px;
  height: 20px;
  background: var(--bg-inset);
  padding: 4px;
  border-radius: 6px;
  margin-bottom: 16px;
  box-shadow: var(--inset-shadow);
}

.vu-bar {
  background: #38322D;
  border-radius: 2px;
  transition: background var(--transition-fast), height var(--transition-fast);
}

.vu-bar.active-low { background: var(--color-emerald); box-shadow: 0 0 4px var(--color-emerald); }
.vu-bar.active-mid { background: var(--amber-500); box-shadow: 0 0 4px var(--amber-500); }
.vu-bar.active-high { background: var(--color-ruby); box-shadow: 0 0 4px var(--color-ruby); }

/* Interactive Terminal Screen */
.terminal-screen {
  background: #0D0B0A;
  border: 1px solid #2B2520;
  border-radius: 8px;
  padding: 16px;
  min-height: 220px;
  box-shadow: inset 0 3px 10px rgba(0,0,0,0.95);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #D4D4D4;
  line-height: 1.6;
  position: relative;
  overflow: hidden;
}

.terminal-line {
  display: flex;
  gap: 10px;
  margin-bottom: 4px;
}

.terminal-prompt {
  color: var(--amber-500);
  font-weight: 700;
}

.terminal-cursor {
  display: inline-block;
  width: 8px;
  height: 15px;
  background: var(--amber-400);
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* Console Route Buttons */
.device-controls-rack {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 16px;
}

.device-route-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--plate-gradient);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-secondary);
  cursor: pointer;
  box-shadow: var(--btn-raised-shadow);
  transition: all var(--transition-fast);
}

.device-route-btn:hover {
  color: var(--amber-400);
  border-color: rgba(245, 158, 11, 0.4);
}

.device-route-btn:active {
  transform: translateY(1px);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.6);
}

/* --------------------------------------------------------------------------
   9. Card-Based Content Grid Layout
   -------------------------------------------------------------------------- */
.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.cards-grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.cards-grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.project-card {
  display: flex;
  flex-direction: column;
  border-radius: 16px;
  overflow: hidden;
}

.card-media-wrapper {
  position: relative;
  height: 220px;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-inset);
}

.card-media-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover .card-media-img {
  transform: scale(1.05);
}

.card-badge-overlay {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
}

.card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.card-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.card-description p {
  margin-bottom: 0.6rem;
}

.card-description p:last-child {
  margin-bottom: 0;
}

.card-description strong {
  color: var(--text-primary);
  font-weight: 700;
}

.card-description em {
  color: var(--amber-300);
}

.card-description code {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(245, 158, 11, 0.25);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--amber-400);
}

.card-description pre {
  background: #060a12;
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: 6px;
  padding: 10px 12px;
  margin: 8px 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #e2e8f0;
}

.card-description pre code {
  background: transparent;
  border: none;
  padding: 0;
}

.card-description a {
  color: var(--amber-400);
  text-decoration: underline;
}

.card-description ul {
  margin: 6px 0 6px 18px;
}

.card-description li {
  margin-bottom: 4px;
}

.card-description blockquote {
  border-left: 3px solid var(--amber-500);
  padding-left: 10px;
  color: var(--text-muted);
  margin: 8px 0;
  font-style: italic;
}

.card-metrics-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  padding: 12px;
  background: var(--bg-inset);
  border-radius: 8px;
  box-shadow: var(--inset-shadow);
}

.metric-unit-item {
  font-size: 0.8rem;
}

.metric-unit-val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--amber-400);
}

.metric-unit-lbl {
  color: var(--text-muted);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.tags-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-tag {
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: 6px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.card-footer {
  padding: 16px 24px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
}

/* --------------------------------------------------------------------------
   10. Interactive AI Generator Playground Widget
   -------------------------------------------------------------------------- */
.playground-chassis {
  background: var(--chassis-gradient);
  border: 2px solid var(--border-highlight);
  border-radius: 20px;
  padding: 32px;
  box-shadow: var(--card-shadow);
  margin: 40px 0;
}

.playground-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 32px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.form-label {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.skeuo-input, .skeuo-select, .skeuo-textarea {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  background: var(--bg-inset);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  color: var(--text-primary);
  box-shadow: var(--inset-shadow);
  transition: all var(--transition-fast);
  outline: none;
}

.skeuo-input:focus, .skeuo-select:focus, .skeuo-textarea:focus {
  border-color: var(--amber-500);
  box-shadow: inset 2px 2px 5px rgba(0,0,0,0.8), 0 0 10px rgba(245, 158, 11, 0.35);
}

.tactile-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 5px;
  background: var(--bg-inset);
  box-shadow: var(--inset-shadow);
  outline: none;
}

.tactile-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #FFFBEB, #F59E0B 60%, #92400E 100%);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.7), 0 0 8px rgba(245, 158, 11, 0.6);
  border: 1px solid #78350F;
}

/* --------------------------------------------------------------------------
   11. Parallax Depth Architecture Blueprint
   -------------------------------------------------------------------------- */
.blueprint-section {
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at center, #26221E 0%, #171412 100%);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  padding: 60px 40px;
  box-shadow: var(--card-shadow);
  margin: 60px 0;
}

.blueprint-grid-bg {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: 
    linear-gradient(to right, rgba(245, 158, 11, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(245, 158, 11, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.architecture-flow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  z-index: 2;
  gap: 20px;
  flex-wrap: wrap;
}

.flow-node {
  flex: 1;
  min-width: 180px;
  background: var(--plate-gradient);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition-normal);
}

.flow-node:hover {
  transform: translateY(-4px);
  border-color: var(--amber-500);
}

.flow-node-icon {
  font-size: 1.8rem;
  color: var(--amber-400);
  margin-bottom: 12px;
  text-shadow: 0 0 10px rgba(245, 158, 11, 0.4);
}

.flow-node-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.flow-node-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.flow-arrow {
  color: var(--amber-500);
  font-size: 1.4rem;
  animation: pulseArrow 2s infinite ease-in-out;
}

@keyframes pulseArrow {
  0%, 100% { opacity: 0.4; transform: translateX(0); }
  50% { opacity: 1; transform: translateX(4px); }
}

/* --------------------------------------------------------------------------
   12. Gallery Filmstrip & Lightbox
   -------------------------------------------------------------------------- */
.filter-bar {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-pill {
  padding: 8px 20px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: 20px;
  border: 1px solid var(--border-subtle);
  background: var(--plate-gradient);
  color: var(--text-secondary);
  cursor: pointer;
  box-shadow: var(--btn-raised-shadow);
  transition: all var(--transition-fast);
}

.filter-pill:hover {
  color: var(--text-primary);
  border-color: var(--border-highlight);
}

.filter-pill.active {
  background: var(--amber-500);
  color: #1A1308;
  border-color: var(--amber-400);
  font-weight: 700;
  box-shadow: 0 0 14px rgba(245, 158, 11, 0.45);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.gallery-item {
  border-radius: 16px;
  overflow: hidden;
  cursor: pointer;
}

.gallery-media-box {
  position: relative;
  height: 240px;
  overflow: hidden;
  background: var(--bg-inset);
}

.gallery-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-item:hover .gallery-img {
  transform: scale(1.06);
}

.gallery-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(to top, rgba(18, 16, 14, 0.95) 0%, rgba(18, 16, 14, 0.2) 60%, transparent 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 20px;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.gallery-item:hover .gallery-overlay {
  opacity: 1;
}

.gallery-item-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #FFFFFF;
}

.gallery-item-model {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--amber-400);
}

/* Lightbox Modal */
.lightbox-modal {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 2000;
  background: rgba(10, 9, 8, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.lightbox-modal.is-open {
  display: flex;
}

.lightbox-dialog {
  max-width: 1000px;
  width: 100%;
  background: var(--chassis-gradient);
  border: 2px solid var(--border-highlight);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.9);
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
}

.lightbox-img-box {
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
}

.lightbox-img {
  max-width: 100%;
  max-height: 520px;
  object-fit: contain;
}

.lightbox-details {
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.lightbox-close-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--plate-gradient);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--btn-raised-shadow);
  z-index: 10;
}

/* --------------------------------------------------------------------------
   13. Interactive Skills Matrix & Telemetry
   -------------------------------------------------------------------------- */
.skill-bar-row {
  margin-bottom: 20px;
}

.skill-info {
  display: flex;
  justify-content: space-between;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 8px;
}

.skill-meter-track {
  height: 12px;
  background: var(--bg-inset);
  border-radius: 6px;
  box-shadow: var(--inset-shadow);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  position: relative;
}

.skill-meter-fill {
  height: 100%;
  background: linear-gradient(90deg, #D97706, #F59E0B, #FDE68A);
  border-radius: 6px;
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.6);
  transition: width 1.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* --------------------------------------------------------------------------
   14. Toast Notification System
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 12px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  min-width: 300px;
  max-width: 420px;
  padding: 16px 20px;
  background: var(--plate-gradient);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  box-shadow: var(--card-shadow);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  transform: translateY(20px);
  opacity: 0;
  transition: all var(--transition-bounce);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-icon {
  font-size: 1.2rem;
  color: var(--amber-400);
}

.toast-success { border-color: var(--color-emerald); }
.toast-success .toast-icon { color: var(--color-emerald); }
.toast-error { border-color: var(--color-ruby); }
.toast-error .toast-icon { color: var(--color-ruby); }

/* --------------------------------------------------------------------------
   15. Multi-Column Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 70px 24px 32px;
  margin-top: auto;
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 50px;
}

.footer-brand-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.footer-brand-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 340px;
}

.footer-col-title {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--amber-500);
  margin-bottom: 20px;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-link-item a {
  font-size: 0.92rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-link-item a:hover {
  color: var(--amber-400);
  padding-left: 4px;
}

.footer-status-card {
  background: var(--bg-inset);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--inset-shadow);
}

.footer-social-strip {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.footer-bottom-bar {
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 16px;
}

/* --------------------------------------------------------------------------
   16. Back to Top Floating Button
   -------------------------------------------------------------------------- */
.back-to-top-btn {
  position: fixed;
  bottom: 24px;
  left: 24px;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--plate-gradient);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--btn-raised-shadow);
  transition: all var(--transition-fast);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
}

.back-to-top-btn.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top-btn:hover {
  color: var(--amber-400);
  border-color: var(--amber-500);
  transform: translateY(-2px);
}

.back-to-top-btn:active {
  transform: translateY(2px);
}

/* --------------------------------------------------------------------------
   17. Scroll-Triggered Fade & Parallax Utilities
   -------------------------------------------------------------------------- */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   18. Responsive Media Queries (Tablets, Phones & Ultra-Compact Screens)
   -------------------------------------------------------------------------- */

/* Tablets & Small Laptops (max-width: 1024px) */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 35px;
  }
  .hero-title {
    font-size: 2.6rem;
  }
  .hero-device {
    transform: none;
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
  .lightbox-dialog {
    grid-template-columns: 1fr;
  }
  .playground-grid {
    grid-template-columns: 1fr;
  }
}

/* Medium Tablets & Large Phones (max-width: 768px) */
@media (max-width: 768px) {
  /* Navigation */
  .nav-container {
    padding: 10px 18px;
  }
  .nav-links, .nav-actions .skeuo-btn {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .mobile-drawer {
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
  }

  /* Typography & Headings */
  .hero-title {
    font-size: 2.1rem;
    line-height: 1.25;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .section-container {
    padding: 50px 18px;
  }

  /* Hero Section */
  .hero-actions {
    display: flex;
    flex-direction: column;
    width: 100%;
    gap: 10px;
  }
  .hero-actions .skeuo-btn {
    width: 100%;
    justify-content: center;
  }
  .hero-metrics-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  /* Grids & Cards */
  .cards-grid-2, .cards-grid-3, .gallery-grid, .playground-grid, .features-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  /* Interactive Console */
  .hero-device {
    padding: 16px;
  }
  .device-controls-rack {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  /* Architecture Diagram Flow */
  .architecture-flow {
    flex-direction: column;
    gap: 12px;
  }
  .flow-arrow {
    transform: rotate(90deg);
  }

  /* Footer */
  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .footer-bottom-bar {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }
}

/* Phones & Small Screens (max-width: 480px) */
@media (max-width: 480px) {
  /* Navigation Bar */
  .nav-container {
    padding: 8px 12px;
  }
  .brand-link {
    font-size: 1.1rem;
    gap: 8px;
  }
  .brand-logo {
    width: 30px;
    height: 30px;
  }
  .theme-switch-btn, .sound-toggle-btn, .mobile-menu-btn {
    width: 36px;
    height: 36px;
    font-size: 0.85rem;
  }
  .nav-actions {
    gap: 8px;
  }

  /* Section Spacing */
  .section-container {
    padding: 35px 12px;
  }
  .hero-section {
    padding: 25px 12px 20px;
  }

  /* Hero Elements */
  .hero-status-pill {
    font-size: 0.68rem;
    padding: 3px 8px;
    margin-bottom: 10px;
  }
  .hero-title {
    font-size: 1.65rem;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
  }
  .hero-description {
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 18px;
  }
  .hero-metrics-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    padding: 10px;
  }
  .metric-dial {
    padding: 10px 8px;
  }
  .metric-dial-val {
    font-size: 1.25rem;
  }
  .metric-dial-label {
    font-size: 0.65rem;
  }

  /* Console & Terminal */
  .hero-device {
    padding: 12px;
    border-radius: 12px;
  }
  .device-title {
    font-size: 0.72rem;
  }
  .vu-meter-rack {
    height: 28px;
    gap: 2px;
    margin-bottom: 8px;
  }
  .terminal-screen {
    min-height: 120px;
    padding: 10px;
    font-size: 0.72rem;
  }
  .device-route-btn {
    padding: 8px 10px;
    font-size: 0.72rem;
  }

  /* Filter Pills & Scrollable Bars */
  .filter-controls, .tab-nav {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 6px;
    scrollbar-width: none;
  }
  .filter-controls::-webkit-scrollbar, .tab-nav::-webkit-scrollbar {
    display: none;
  }
  .filter-pill {
    padding: 6px 12px;
    font-size: 0.78rem;
    flex-shrink: 0;
  }

  /* Cards & Panels */
  .skeuo-panel {
    padding: 14px;
    border-radius: 12px;
  }
  .card-img-wrap {
    height: 180px;
  }
  .card-title {
    font-size: 1.1rem;
  }
  .card-desc {
    font-size: 0.85rem;
  }

  /* Forms & Touch Targets (Prevent iOS Zoom) */
  input, select, textarea {
    font-size: 16px !important;
  }
  .form-group input, .form-group select, .form-group textarea {
    padding: 10px 12px;
  }
  .form-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* Lightbox Modal */
  .lightbox-modal {
    padding: 8px;
  }
  .lightbox-dialog {
    padding: 12px;
    border-radius: 12px;
  }
  .lightbox-img-box {
    max-height: 220px;
  }
  .lightbox-details h3 {
    font-size: 1.15rem;
  }

  /* Floating UI Elements */
  .back-to-top-btn {
    bottom: 16px;
    left: 16px;
    width: 40px;
    height: 40px;
  }
  .toast-container {
    bottom: 16px;
    right: 16px;
    left: 16px;
  }
  .toast {
    min-width: unset;
    width: 100%;
    padding: 12px 14px;
    font-size: 0.82rem;
  }
}