/*
 * AVDemkin.ru - Vibe Coding Platform
 * MULTI-THEME SYSTEM: MS-DOS | SCI-FI | CYBERPUNK
 * ══════════════════════════════════════════════════
 */

/* === FONTS === */
@import url('https://fonts.googleapis.com/css2?family=VT323&family=Press+Start+2P&family=Orbitron:wght@400;500;600;700;800;900&family=Rajdhani:wght@400;500;600;700&family=Share+Tech+Mono&display=swap');

/* === RESET & BASE === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ═══════════════════════════════════════════════════════════
   THEME: MS-DOS (Default)
   ═══════════════════════════════════════════════════════════ */
:root,
[data-theme="dos"] {
  /* DOS Color Palette */
  --bg-primary: #0000AA;
  --bg-secondary: #000000;
  --bg-card: #000080;
  --bg-card-hover: #0000CC;
  --text-primary: #FFFFFF;
  --text-secondary: #AAAAAA;
  --text-muted: #555555;
  --accent: #55FFFF;
  --accent-hover: #FFFF55;
  --accent-glow: rgba(85, 255, 255, 0.3);
  --success: #55FF55;
  --warning: #FFFF55;
  --danger: #FF5555;
  --border: #5555FF;
  --border-light: #AAAAAA;

  /* Typography */
  --font-heading: 'Press Start 2P', cursive;
  --font-body: 'VT323', 'Courier New', monospace;
  --font-size-base: 22px;
  --font-size-h1: 24px;
  --font-size-h2: 18px;
  --font-size-h3: 14px;

  /* Effects */
  --border-radius: 0px;
  --box-shadow: 4px 4px 0 var(--bg-secondary);
  --card-border: 2px solid var(--border-light);
  --btn-transform: translate(2px, 2px);
  --glow-effect: none;
  --scanlines: repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.15), rgba(0, 0, 0, 0.15) 1px, transparent 1px, transparent 2px);
  --crt-effect: radial-gradient(ellipse at center, transparent 0%, rgba(0,0,0,0.3) 100%);

  /* Theme-specific */
  --theme-decoration: '░';
  --theme-cursor: '█';
  --theme-arrow: '>';
  --header-bg: var(--bg-primary);
}

/* ═══════════════════════════════════════════════════════════
   THEME: SCI-FI FUTURISM
   ═══════════════════════════════════════════════════════════ */
[data-theme="scifi"] {
  /* Sci-Fi Color Palette */
  --bg-primary: #0a0a1a;
  --bg-secondary: #050510;
  --bg-card: linear-gradient(135deg, rgba(20, 30, 60, 0.9) 0%, rgba(10, 15, 30, 0.95) 100%);
  --bg-card-hover: linear-gradient(135deg, rgba(30, 45, 80, 0.9) 0%, rgba(15, 20, 40, 0.95) 100%);
  --text-primary: #e0f0ff;
  --text-secondary: #8090b0;
  --text-muted: #4a5570;
  --accent: #00d4ff;
  --accent-hover: #00ffcc;
  --accent-glow: rgba(0, 212, 255, 0.4);
  --success: #00ff88;
  --warning: #ffcc00;
  --danger: #ff3366;
  --border: rgba(0, 212, 255, 0.3);
  --border-light: rgba(0, 212, 255, 0.5);

  /* Typography */
  --font-heading: 'Orbitron', sans-serif;
  --font-body: 'Rajdhani', sans-serif;
  --font-size-base: 18px;
  --font-size-h1: 42px;
  --font-size-h2: 32px;
  --font-size-h3: 24px;

  /* Effects */
  --border-radius: 8px;
  --box-shadow: 0 10px 40px rgba(0, 212, 255, 0.15), 0 0 1px rgba(0, 212, 255, 0.5);
  --card-border: 1px solid var(--border);
  --btn-transform: translateY(-3px);
  --glow-effect: 0 0 30px var(--accent-glow);
  --scanlines: none;
  --crt-effect: none;

  /* Theme-specific */
  --theme-decoration: '◇';
  --theme-cursor: '▸';
  --theme-arrow: '→';
  --header-bg: rgba(10, 10, 26, 0.95);
}

/* ═══════════════════════════════════════════════════════════
   THEME: CYBERPUNK 80s
   ═══════════════════════════════════════════════════════════ */
[data-theme="cyberpunk"] {
  /* Cyberpunk Color Palette */
  --bg-primary: #0d0221;
  --bg-secondary: #1a0a2e;
  --bg-card: linear-gradient(180deg, rgba(30, 10, 60, 0.9) 0%, rgba(15, 5, 35, 0.95) 100%);
  --bg-card-hover: linear-gradient(180deg, rgba(50, 15, 80, 0.9) 0%, rgba(25, 8, 50, 0.95) 100%);
  --text-primary: #fff0f5;
  --text-secondary: #cc99cc;
  --text-muted: #665577;
  --accent: #ff00ff;
  --accent-hover: #00ffff;
  --accent-glow: rgba(255, 0, 255, 0.4);
  --success: #39ff14;
  --warning: #ffff00;
  --danger: #ff0055;
  --border: rgba(255, 0, 255, 0.4);
  --border-light: rgba(255, 0, 255, 0.6);

  /* Typography */
  --font-heading: 'Orbitron', sans-serif;
  --font-body: 'Share Tech Mono', monospace;
  --font-size-base: 17px;
  --font-size-h1: 38px;
  --font-size-h2: 28px;
  --font-size-h3: 20px;

  /* Effects */
  --border-radius: 4px;
  --box-shadow: 0 0 20px rgba(255, 0, 255, 0.3), 0 0 60px rgba(255, 0, 255, 0.1);
  --card-border: 2px solid var(--border);
  --btn-transform: translateY(-2px) scale(1.02);
  --glow-effect: 0 0 40px var(--accent-glow), 0 0 80px rgba(0, 255, 255, 0.2);
  --scanlines: repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.1) 1px, transparent 1px, transparent 3px);
  --crt-effect: none;

  /* Theme-specific */
  --theme-decoration: '//';
  --theme-cursor: '_';
  --theme-arrow: '»';
  --header-bg: rgba(13, 2, 33, 0.95);
}

/* ═══════════════════════════════════════════════════════════
   THEME: CODE / TERMINAL (Tech Style)
   ═══════════════════════════════════════════════════════════ */
[data-theme="code"] {
  /* Terminal / Matrix Color Palette */
  --bg-primary: #0a0a0a;
  --bg-secondary: #050505;
  --bg-card: linear-gradient(180deg, rgba(10, 20, 15, 0.95) 0%, rgba(5, 10, 8, 0.98) 100%);
  --bg-card-hover: linear-gradient(180deg, rgba(15, 30, 20, 0.95) 0%, rgba(10, 20, 15, 0.98) 100%);
  --text-primary: #00ff88;
  --text-secondary: #00ffcc;
  --text-muted: #00aa66;
  --accent: #00ff88;
  --accent-hover: #00ffcc;
  --accent-glow: rgba(0, 255, 136, 0.5);
  --success: #00ff88;
  --warning: #ffff00;
  --danger: #ff3333;
  --border: rgba(0, 255, 136, 0.3);
  --border-light: rgba(0, 255, 136, 0.5);

  /* Syntax colors - Neon Tech */
  --code-keyword: #ff00ff;
  --code-string: #ffcc00;
  --code-number: #00ffff;
  --code-comment: #00aa66;
  --code-function: #00ff88;
  --code-variable: #00ffcc;
  --code-class: #ff00ff;
  --code-operator: #ffffff;

  /* Typography */
  --font-heading: 'Share Tech Mono', 'JetBrains Mono', monospace;
  --font-body: 'Share Tech Mono', 'JetBrains Mono', 'Consolas', monospace;
  --font-size-base: 16px;
  --font-size-h1: 36px;
  --font-size-h2: 26px;
  --font-size-h3: 18px;

  /* Effects */
  --border-radius: 2px;
  --box-shadow: 0 0 30px rgba(0, 255, 136, 0.2), 0 0 60px rgba(0, 255, 136, 0.1), inset 0 0 20px rgba(0, 255, 136, 0.05);
  --card-border: 1px solid rgba(0, 255, 136, 0.3);
  --btn-transform: translateY(-2px);
  --glow-effect: 0 0 20px var(--accent-glow), 0 0 40px rgba(0, 255, 136, 0.3);
  --scanlines: repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.1) 1px, transparent 1px, transparent 2px);
  --crt-effect: none;

  /* Theme-specific */
  --theme-decoration: '>';
  --theme-cursor: '█';
  --theme-arrow: '$';
  --header-bg: rgba(5, 5, 5, 0.98);
}

/* ═══════════════════════════════════════════════════════════
   COMMON STYLES
   ═══════════════════════════════════════════════════════════ */

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  background: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  position: relative;
}

/* Scanlines Effect (DOS & Cyberpunk) */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--scanlines);
  pointer-events: none;
  z-index: 9999;
}

/* CRT Effect (DOS only) */
[data-theme="dos"] body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--crt-effect);
  pointer-events: none;
  z-index: 9998;
}

/* Cyberpunk Grid Background */
[data-theme="cyberpunk"] body {
  background:
    linear-gradient(90deg, rgba(255,0,255,0.03) 1px, transparent 1px),
    linear-gradient(rgba(255,0,255,0.03) 1px, transparent 1px),
    var(--bg-secondary);
  background-size: 50px 50px;
}

/* Sci-Fi Stars Background */
[data-theme="scifi"] body {
  background:
    radial-gradient(2px 2px at 20px 30px, rgba(0,212,255,0.3), transparent),
    radial-gradient(2px 2px at 40px 70px, rgba(0,255,200,0.2), transparent),
    radial-gradient(1px 1px at 90px 40px, rgba(255,255,255,0.3), transparent),
    radial-gradient(2px 2px at 130px 80px, rgba(0,212,255,0.2), transparent),
    radial-gradient(1px 1px at 160px 120px, rgba(255,255,255,0.4), transparent),
    var(--bg-secondary);
  background-size: 200px 200px;
}

/* CODE Theme - Terminal/Matrix Background */
[data-theme="code"] body {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(0, 255, 136, 0.08) 0%, transparent 50%),
    var(--bg-secondary);
  position: relative;
}

[data-theme="code"] body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    linear-gradient(90deg, rgba(0, 255, 136, 0.03) 1px, transparent 1px),
    linear-gradient(rgba(0, 255, 136, 0.03) 1px, transparent 1px);
  background-size: 30px 30px;
  pointer-events: none;
  z-index: 0;
  animation: gridPulse 4s ease-in-out infinite;
}

@keyframes gridPulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* Code Rain Animation Container */
.code-rain {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.5s ease;
}

[data-theme="code"] .code-rain {
  opacity: 1;
}

.code-line {
  position: absolute;
  font-family: 'Share Tech Mono', 'JetBrains Mono', monospace;
  font-size: 11px;
  white-space: nowrap;
  opacity: 0;
  animation: codeFloat 12s linear infinite;
  text-shadow: 0 0 10px currentColor;
}

.code-line:nth-child(1) { left: 3%; animation-delay: 0s; color: #00ff88; }
.code-line:nth-child(2) { left: 12%; animation-delay: 1.5s; color: #ff00ff; }
.code-line:nth-child(3) { left: 22%; animation-delay: 3s; color: #00ffcc; }
.code-line:nth-child(4) { left: 32%; animation-delay: 0.8s; color: #ffcc00; }
.code-line:nth-child(5) { left: 42%; animation-delay: 2.2s; color: #00ff88; }
.code-line:nth-child(6) { left: 52%; animation-delay: 4s; color: #00aa66; }
.code-line:nth-child(7) { left: 62%; animation-delay: 1.8s; color: #ff00ff; }
.code-line:nth-child(8) { left: 72%; animation-delay: 3.5s; color: #00ffff; }
.code-line:nth-child(9) { left: 82%; animation-delay: 1s; color: #00ff88; }
.code-line:nth-child(10) { left: 92%; animation-delay: 2.8s; color: #00ffcc; }

@keyframes codeFloat {
  0% {
    transform: translateY(-100%);
    opacity: 0;
  }
  3% {
    opacity: 0.25;
  }
  97% {
    opacity: 0.25;
  }
  100% {
    transform: translateY(100vh);
    opacity: 0;
  }
}

/* Typing cursor animation for code theme */
[data-theme="code"] .hero-badge::after {
  content: '█';
  animation: blink 0.8s step-end infinite;
  margin-left: 4px;
  color: var(--accent);
  text-shadow: 0 0 10px var(--accent);
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* Code theme specific card styling */
[data-theme="code"] .card {
  position: relative;
  overflow: hidden;
}

[data-theme="code"] .card::before {
  content: '> _';
  position: absolute;
  top: 10px;
  right: 14px;
  font-size: 12px;
  color: var(--accent);
  font-family: var(--font-body);
  text-shadow: 0 0 10px var(--accent);
  animation: terminalBlink 1.5s ease-in-out infinite;
}

@keyframes terminalBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* Glowing border effect for cards in CODE theme */
[data-theme="code"] .card {
  border: 1px solid rgba(0, 255, 136, 0.2);
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.1), inset 0 0 30px rgba(0, 255, 136, 0.02);
}

[data-theme="code"] .card:hover {
  border-color: rgba(0, 255, 136, 0.5);
  box-shadow: 0 0 30px rgba(0, 255, 136, 0.2), inset 0 0 30px rgba(0, 255, 136, 0.05);
}

/* Hide terminal cursor on course cards (they have their own badge) */
[data-theme="code"] .course-card::before {
  content: none;
}

/* Line numbers effect for code theme */
[data-theme="code"] .card-title::before {
  content: '01 ';
  color: rgba(255, 255, 255, 0.2);
  font-size: 0.8em;
}

/* No line numbers on course cards */
[data-theme="code"] .course-card .card-title::before {
  content: none;
}

/* Syntax highlighting on buttons */
[data-theme="code"] .btn-primary {
  background: linear-gradient(135deg, var(--code-keyword) 0%, #9b5de5 100%);
}

[data-theme="code"] .btn-secondary {
  border-color: var(--code-function);
  color: var(--code-function);
}

[data-theme="code"] .btn-secondary:hover {
  background: var(--code-function);
  color: var(--bg-primary);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover {
  color: var(--accent-hover);
  text-shadow: var(--glow-effect);
}

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

::selection {
  background: var(--accent);
  color: var(--bg-secondary);
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  text-transform: uppercase;
  letter-spacing: 1px;
}

h1 { font-size: var(--font-size-h1); margin-bottom: 20px; }
h2 { font-size: var(--font-size-h2); margin-bottom: 16px; }
h3 { font-size: var(--font-size-h3); margin-bottom: 12px; }
h4 { font-size: calc(var(--font-size-h3) - 2px); margin-bottom: 10px; }

.text-gradient {
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-hover) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

[data-theme="dos"] .text-gradient {
  background: none;
  -webkit-text-fill-color: var(--accent);
  text-shadow: 2px 2px 0 var(--danger);
}

.text-mono {
  font-family: var(--font-body);
}

/* Blinking Cursor */
.cursor::after {
  content: var(--theme-cursor);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* === LAYOUT === */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

[data-theme="dos"] .section {
  padding: 60px 0;
}

.section-sm {
  padding: 50px 0;
}

/* === HEADER / NAV === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--header-bg);
  border-bottom: var(--card-border);
  backdrop-filter: blur(20px);
}

[data-theme="dos"] .header {
  backdrop-filter: none;
  box-shadow: 0 4px 0 var(--bg-secondary);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

[data-theme="dos"] .nav {
  height: 60px;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 18px;
  color: var(--accent);
  font-weight: 700;
}

[data-theme="dos"] .nav-logo {
  font-size: 14px;
  color: var(--warning);
  text-shadow: 2px 2px 0 #AA5500;
}

.nav-logo:hover {
  color: var(--accent-hover);
  text-shadow: var(--glow-effect);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 35px;
  list-style: none;
}

.nav-link {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  text-transform: uppercase;
  position: relative;
  font-weight: 500;
}

.nav-link::before {
  content: var(--theme-arrow);
  position: absolute;
  left: -18px;
  opacity: 0;
  color: var(--accent);
  transition: all 0.3s;
}

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

.nav-link:hover::before {
  opacity: 1;
}

[data-theme="dos"] .nav-link:hover::before {
  animation: arrow-blink 0.5s step-end infinite;
}

@keyframes arrow-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

/* === THEME SWITCHER === */
.theme-switcher {
  display: flex;
  gap: 8px;
  padding: 4px;
  background: rgba(0,0,0,0.3);
  border-radius: var(--border-radius);
  border: 1px solid var(--border);
}

.theme-btn {
  padding: 6px 12px;
  font-family: var(--font-body);
  font-size: 14px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--border-radius);
  transition: all 0.3s;
  text-transform: uppercase;
}

.theme-btn:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.1);
}

.theme-btn.active {
  background: var(--accent);
  color: var(--bg-secondary);
  font-weight: 600;
}

[data-theme="dos"] .theme-btn {
  font-family: 'VT323', monospace;
  font-size: 16px;
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-transform: uppercase;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

[data-theme="dos"] .btn {
  background: var(--border-light);
  color: var(--bg-secondary);
  box-shadow:
    inset 2px 2px 0 var(--text-primary),
    inset -2px -2px 0 var(--text-muted),
    4px 4px 0 var(--bg-secondary);
}

[data-theme="dos"] .btn:hover {
  background: var(--text-primary);
}

[data-theme="dos"] .btn:active {
  box-shadow:
    inset -2px -2px 0 var(--text-primary),
    inset 2px 2px 0 var(--text-muted);
  transform: var(--btn-transform);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  color: var(--bg-secondary);
  box-shadow: var(--glow-effect);
}

[data-theme="dos"] .btn-primary {
  background: var(--success);
  box-shadow:
    inset 2px 2px 0 var(--text-primary),
    inset -2px -2px 0 var(--text-muted),
    4px 4px 0 var(--bg-secondary);
}

.btn-primary:hover {
  transform: var(--btn-transform);
  box-shadow: var(--glow-effect), 0 10px 30px rgba(0,0,0,0.3);
  color: var(--bg-secondary);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
}

.btn-secondary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-secondary);
  transform: var(--btn-transform);
}

[data-theme="dos"] .btn-secondary {
  background: var(--text-muted);
  color: var(--text-primary);
  border: none;
}

.btn-ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid transparent;
}

.btn-ghost:hover {
  border-color: var(--accent);
  background: rgba(255,255,255,0.05);
  color: var(--accent-hover);
}

[data-theme="dos"] .btn-ghost {
  box-shadow: none;
  border: 2px solid var(--accent);
}

.btn-danger {
  background: var(--danger);
  color: var(--text-primary);
}

.btn-danger:hover {
  background: var(--warning);
  color: var(--bg-secondary);
}

.btn-sm {
  padding: 8px 16px;
  font-size: calc(var(--font-size-base) - 2px);
}

.btn-lg {
  padding: 16px 32px;
  font-size: calc(var(--font-size-base) + 2px);
}

.btn-block {
  width: 100%;
}

/* === CARDS === */
.card {
  background: var(--bg-card);
  border: var(--card-border);
  border-radius: var(--border-radius);
  padding: 28px;
  box-shadow: var(--box-shadow);
  transition: all 0.3s ease;
}

.card:hover {
  background: var(--bg-card-hover);
  box-shadow: var(--glow-effect);
  transform: translateY(-4px);
}

[data-theme="dos"] .card {
  box-shadow:
    inset 2px 2px 0 var(--border),
    inset -2px -2px 0 var(--text-muted),
    6px 6px 0 var(--bg-secondary);
}

[data-theme="dos"] .card:hover {
  transform: none;
}

.card-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-h3);
  color: var(--accent);
  margin-bottom: 12px;
  text-transform: uppercase;
}

[data-theme="dos"] .card-title {
  font-size: 12px;
  color: var(--warning);
}

.card-text {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

/* === HERO === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 70px;
  background: var(--bg-primary);
  position: relative;
  overflow: hidden;
}

/* Theme-specific hero backgrounds */
[data-theme="dos"] .hero::before {
  content: '░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░';
  position: absolute;
  top: 0;
  left: 0;
  width: 200%;
  height: 200%;
  font-family: var(--font-body);
  font-size: 30px;
  color: rgba(85, 85, 255, 0.3);
  line-height: 1;
  pointer-events: none;
  animation: scroll-bg 20s linear infinite;
}

[data-theme="scifi"] .hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 20% 80%, rgba(0, 212, 255, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(0, 255, 200, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

[data-theme="cyberpunk"] .hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    linear-gradient(45deg, rgba(255,0,255,0.1) 0%, transparent 50%),
    linear-gradient(-45deg, rgba(0,255,255,0.1) 0%, transparent 50%);
  pointer-events: none;
  animation: cyber-pulse 4s ease-in-out infinite;
}

@keyframes scroll-bg {
  0% { transform: translate(0, 0); }
  100% { transform: translate(-50%, -50%); }
}

@keyframes cyber-pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: calc(var(--font-size-base) - 4px);
  color: var(--text-secondary);
  margin-bottom: 30px;
  backdrop-filter: blur(10px);
}

[data-theme="dos"] .hero-badge {
  border-radius: 0;
  backdrop-filter: none;
  border: 2px solid var(--success);
  color: var(--success);
}

.hero-badge-dot {
  width: 10px;
  height: 10px;
  background: var(--success);
  border-radius: 50%;
  animation: blink 2s infinite;
}

[data-theme="dos"] .hero-badge-dot {
  border-radius: 0;
  animation: blink 1s step-end infinite;
}

.hero h1 {
  margin-bottom: 24px;
}

[data-theme="dos"] .hero h1 {
  text-shadow:
    4px 4px 0 var(--danger),
    -2px -2px 0 var(--accent);
}

[data-theme="scifi"] .hero h1,
[data-theme="cyberpunk"] .hero h1 {
  text-shadow: var(--glow-effect);
}

.hero-desc {
  font-size: calc(var(--font-size-base) + 4px);
  color: var(--text-secondary);
  margin-bottom: 35px;
  max-width: 650px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

/* === FEATURE GRID === */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.feature-card {
  padding: 32px;
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 24px;
  color: var(--accent);
}

[data-theme="dos"] .feature-icon {
  width: 50px;
  height: 50px;
  font-family: var(--font-body);
}

/* === FORMS === */
.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--accent);
  text-transform: uppercase;
}

[data-theme="dos"] .form-label::before {
  content: '> ';
  color: var(--warning);
}

.form-input {
  width: 100%;
  padding: 14px 18px;
  background: rgba(0,0,0,0.4);
  border: 2px solid var(--border);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  transition: all 0.3s;
}

[data-theme="dos"] .form-input {
  background: var(--bg-secondary);
  color: var(--success);
  caret-color: var(--success);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--glow-effect);
}

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

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='%2355FFFF' viewBox='0 0 24 24'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 20px;
  padding-right: 45px;
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}

.form-checkbox input {
  width: 22px;
  height: 22px;
  accent-color: var(--accent);
}

.form-error {
  color: var(--danger);
  font-size: calc(var(--font-size-base) - 2px);
  margin-top: 8px;
}

[data-theme="dos"] .form-error::before {
  content: '! ERROR: ';
  color: var(--warning);
}

/* === AUTH FORMS === */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--bg-primary);
}

.auth-card {
  width: 100%;
  max-width: 450px;
  padding: 40px;
}

.auth-title {
  text-align: center;
  margin-bottom: 10px;
  color: var(--accent);
}

.auth-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 30px;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 24px 0;
  color: var(--text-muted);
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.auth-footer {
  text-align: center;
  margin-top: 28px;
  color: var(--text-secondary);
}

/* === ALERTS / FLASH === */
.flash {
  padding: 16px 24px;
  border-radius: var(--border-radius);
  margin-bottom: 24px;
  border: 1px solid;
  font-size: var(--font-size-base);
}

.flash-notice {
  background: rgba(0, 255, 100, 0.1);
  border-color: var(--success);
  color: var(--success);
}

.flash-alert {
  background: rgba(255, 50, 100, 0.1);
  border-color: var(--danger);
  color: var(--danger);
}

[data-theme="dos"] .flash {
  border-radius: 0;
  border-width: 2px;
  background: var(--bg-secondary);
}

/* === COURSE CARDS === */
.course-card {
  position: relative;
  overflow: hidden;
}

/* Space for badge in all themes */
.course-card .card-title {
  padding-right: 100px;
}

.course-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 4px 12px;
  background: var(--accent);
  color: var(--bg-secondary);
  font-family: var(--font-heading);
  font-size: 10px;
  font-weight: 700;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  z-index: 10;
  line-height: 1.4;
}

[data-theme="dos"] .course-badge {
  border-radius: 0;
  border: 2px solid var(--text-primary);
  padding: 4px 10px;
}

[data-theme="scifi"] .course-badge,
[data-theme="cyberpunk"] .course-badge {
  box-shadow: var(--glow-effect);
}

[data-theme="code"] .course-badge {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  text-shadow: 0 0 10px var(--accent);
  box-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
}

.course-price {
  font-family: var(--font-heading);
  font-size: 24px;
  color: var(--success);
}

[data-theme="dos"] .course-price {
  font-size: 16px;
}

.course-price::before {
  content: var(--theme-decoration);
  margin-right: 8px;
  color: var(--accent);
}

.course-meta {
  display: flex;
  gap: 20px;
  color: var(--text-muted);
  font-size: calc(var(--font-size-base) - 2px);
  margin-top: 16px;
}

/* === LESSONS === */
.lessons-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.lesson-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 24px;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  transition: all 0.3s;
}

.lesson-item:hover {
  border-color: var(--accent);
  background: rgba(0,0,0,0.5);
  box-shadow: var(--glow-effect);
}

[data-theme="dos"] .lesson-item {
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: 0;
}

.lesson-number {
  width: 40px;
  height: 40px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 14px;
  color: var(--bg-secondary);
  font-weight: 700;
}

[data-theme="dos"] .lesson-number {
  border-radius: 0;
  font-size: 10px;
}

.lesson-title {
  flex: 1;
  font-weight: 500;
}

.lesson-duration {
  color: var(--text-muted);
  font-size: calc(var(--font-size-base) - 2px);
}

/* === DASHBOARD === */
.dashboard {
  padding-top: 100px;
  min-height: 100vh;
  background: var(--bg-primary);
}

.dashboard-header {
  margin-bottom: 40px;
}

.dashboard-greeting {
  font-size: var(--font-size-base);
  color: var(--accent);
  margin-bottom: 10px;
}

[data-theme="dos"] .dashboard-greeting::before {
  content: 'C:\\USERS\\> ';
  color: var(--warning);
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.stat-card {
  padding: 28px;
  text-align: center;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 48px;
  color: var(--accent);
  margin-bottom: 8px;
}

[data-theme="dos"] .stat-value {
  font-size: 36px;
  color: var(--success);
}

.stat-label {
  color: var(--text-secondary);
  text-transform: uppercase;
  font-weight: 500;
}

/* === KNOWLEDGE BASE === */
.kb-categories {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.kb-category {
  padding: 10px 20px;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  border-radius: 50px;
  color: var(--text-secondary);
  font-size: calc(var(--font-size-base) - 2px);
  text-transform: uppercase;
  transition: all 0.3s;
}

[data-theme="dos"] .kb-category {
  border-radius: 0;
  border-width: 2px;
}

.kb-category:hover,
.kb-category.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-secondary);
}

.kb-article {
  padding: 24px;
  margin-bottom: 16px;
}

.kb-article-title {
  margin-bottom: 10px;
  color: var(--accent);
}

.kb-article-meta {
  display: flex;
  gap: 20px;
  color: var(--text-muted);
  font-size: calc(var(--font-size-base) - 2px);
}

/* === CONTENT (Markdown) === */
.content {
  max-width: 800px;
}

.content h1, .content h2, .content h3 {
  margin: 35px 0 18px;
  color: var(--accent);
}

.content p {
  margin-bottom: 20px;
  line-height: 1.7;
}

.content ul, .content ol {
  margin-bottom: 20px;
  padding-left: 30px;
}

.content li {
  margin-bottom: 10px;
}

.content li::marker {
  color: var(--accent);
}

.content code {
  font-family: 'Share Tech Mono', monospace;
  background: rgba(0,0,0,0.4);
  color: var(--success);
  padding: 4px 10px;
  border-radius: var(--border-radius);
  border: 1px solid var(--border);
}

[data-theme="dos"] .content code {
  font-family: var(--font-body);
  border-radius: 0;
}

.content pre {
  background: rgba(0,0,0,0.5);
  padding: 24px;
  border-radius: var(--border-radius);
  border: 1px solid var(--border);
  overflow-x: auto;
  margin-bottom: 24px;
}

.content pre code {
  background: none;
  padding: 0;
  border: none;
}

/* === ADMIN === */
.admin-layout {
  display: flex;
  min-height: 100vh;
  background: var(--bg-primary);
}

.admin-sidebar {
  background: var(--bg-secondary);
  border-right: var(--card-border);
  padding: 24px 0;
  position: fixed;
  top: 0;
  left: 0;
  width: 240px;
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
  display: flex;
  flex-direction: column;
}

[data-theme="dos"] .admin-sidebar {
  width: 220px;
  border-right: 4px solid var(--border);
}

.admin-sidebar-header {
  padding: 0 24px 24px;
  border-bottom: var(--card-border);
  margin-bottom: 24px;
}

.admin-sidebar-title {
  font-family: var(--font-heading);
  font-size: 16px;
  color: var(--accent);
}

[data-theme="dos"] .admin-sidebar-title {
  font-size: 12px;
  color: var(--warning);
}

.admin-nav {
  list-style: none;
}

.admin-nav-item {
  display: block;
  padding: 14px 24px;
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  border-left: 3px solid transparent;
  transition: all 0.3s;
}

[data-theme="dos"] .admin-nav-item::before {
  content: '├─ ';
  color: var(--border);
}

.admin-nav-item:hover,
.admin-nav-item.active {
  background: rgba(255,255,255,0.05);
  color: var(--accent);
  border-left-color: var(--accent);
}

[data-theme="dos"] .admin-nav-item.active::before {
  content: '►─ ';
  color: var(--warning);
}

.admin-main {
  margin-left: 240px;
  padding: 32px;
  min-width: 0;
  width: calc(100% - 240px);
}

[data-theme="dos"] .admin-main {
  margin-left: 220px;
  width: calc(100% - 220px);
}

/* Admin content should fill available width */
.admin-main > .card {
  width: 100%;
}

.admin-main .table-wrapper {
  width: 100%;
}

.admin-main .table {
  min-width: 600px;
}

.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: var(--card-border);
}

/* Admin-specific grid fixes */
.admin-main .dashboard-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.admin-main .features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

@media (max-width: 1200px) {
  .admin-main .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .admin-main .dashboard-grid {
    grid-template-columns: 1fr;
  }
  .admin-main .features-grid {
    grid-template-columns: 1fr;
  }
}

/* === TABLES === */
.table-wrapper {
  overflow-x: auto;
  background: rgba(0,0,0,0.3);
  border: var(--card-border);
  border-radius: var(--border-radius);
}

[data-theme="dos"] .table-wrapper {
  border-radius: 0;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.table th {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--accent);
  background: rgba(0,0,0,0.3);
  text-transform: uppercase;
}

.table tbody tr {
  transition: background 0.2s ease;
}

.table tbody tr:hover td {
  background: rgba(255,255,255,0.05);
}

[data-theme="dos"] .table tbody tr:hover td {
  background: rgba(85, 85, 255, 0.2);
}

.table-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  white-space: nowrap;
}

.table-actions .btn {
  flex-shrink: 0;
}

/* Make action column not too wide */
.table th:last-child,
.table td:last-child {
  text-align: right;
}

/* === BADGES === */
.badge {
  display: inline-flex;
  padding: 5px 12px;
  font-family: var(--font-body);
  font-size: calc(var(--font-size-base) - 4px);
  font-weight: 600;
  text-transform: uppercase;
  border-radius: 50px;
  border: 1px solid;
}

[data-theme="dos"] .badge {
  border-radius: 0;
  border-width: 2px;
}

.badge-success {
  background: rgba(0, 255, 100, 0.1);
  border-color: var(--success);
  color: var(--success);
}

.badge-warning {
  background: rgba(255, 200, 0, 0.1);
  border-color: var(--warning);
  color: var(--warning);
}

.badge-danger {
  background: rgba(255, 50, 100, 0.1);
  border-color: var(--danger);
  color: var(--danger);
}

.badge-info {
  background: rgba(0, 200, 255, 0.1);
  border-color: var(--accent);
  color: var(--accent);
}

/* === PAGINATION === */
.pagination {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 40px;
}

.pagination a,
.pagination span {
  padding: 10px 16px;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  transition: all 0.3s;
}

.pagination a:hover {
  background: rgba(255,255,255,0.1);
  color: var(--accent);
  border-color: var(--accent);
}

.pagination .current {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-secondary);
}

/* === FOOTER === */
.footer {
  padding: 60px 0 30px;
  border-top: var(--card-border);
  margin-top: 80px;
  background: var(--bg-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 50px;
  margin-bottom: 50px;
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--accent);
  margin-bottom: 18px;
}

[data-theme="dos"] .footer-brand {
  font-size: 14px;
  color: var(--warning);
}

.footer-desc {
  color: var(--text-secondary);
  max-width: 320px;
  line-height: 1.6;
}

.footer-title {
  font-family: var(--font-heading);
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 18px;
  text-transform: uppercase;
}

[data-theme="dos"] .footer-title {
  font-size: 10px;
}

[data-theme="dos"] .footer-title::before {
  content: '┌─ ';
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

[data-theme="dos"] .footer-links li::before {
  content: '│  ';
  color: var(--border);
}

.footer-links a {
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-bottom {
  text-align: center;
  color: var(--text-muted);
  padding-top: 30px;
  border-top: var(--card-border);
}

/* === UTILITY === */
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-secondary); }

.flex { display: flex; }
.flex-center { justify-content: center; align-items: center; }
.flex-between { justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }

.hidden { display: none; }

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .theme-switcher {
    display: none;
  }

  .hero h1 {
    font-size: calc(var(--font-size-h1) * 0.7);
  }

  .hero-actions {
    flex-direction: column;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 35px;
  }

  .admin-layout {
    grid-template-columns: 1fr;
  }

  .admin-sidebar {
    display: none;
  }

  .admin-main {
    margin-left: 0;
  }
}

/* ═══════════════════════════════════════════════════════════
   BRAIN UPLOAD ANIMATION (Hero)
   ═══════════════════════════════════════════════════════════ */

.brain-upload-container {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  width: 400px;
  height: 400px;
  pointer-events: none;
}

@media (max-width: 1200px) {
  .brain-upload-container {
    display: none;
  }
}

.brain-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 120px;
  opacity: 0.8;
  filter: drop-shadow(0 0 30px var(--accent-glow));
  animation: brain-pulse 3s ease-in-out infinite;
}

@keyframes brain-pulse {
  0%, 100% {
    transform: translate(-50%, -50%) scale(1);
    filter: drop-shadow(0 0 30px var(--accent-glow));
  }
  50% {
    transform: translate(-50%, -50%) scale(1.05);
    filter: drop-shadow(0 0 50px var(--accent-glow));
  }
}

/* Data streams flowing into brain */
.data-stream {
  position: absolute;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--accent);
  white-space: nowrap;
  opacity: 0;
  text-shadow: 0 0 10px var(--accent-glow);
}

.data-stream-1 { top: 10%; left: 0; animation: stream-flow 4s linear infinite; }
.data-stream-2 { top: 25%; left: -10%; animation: stream-flow 3.5s linear infinite 0.5s; }
.data-stream-3 { top: 40%; left: -5%; animation: stream-flow 4.5s linear infinite 1s; }
.data-stream-4 { top: 55%; left: -8%; animation: stream-flow 3.8s linear infinite 1.5s; }
.data-stream-5 { top: 70%; left: 0; animation: stream-flow 4.2s linear infinite 2s; }
.data-stream-6 { top: 85%; left: -3%; animation: stream-flow 3.6s linear infinite 2.5s; }

@keyframes stream-flow {
  0% {
    transform: translateX(-100px);
    opacity: 0;
  }
  20% {
    opacity: 1;
  }
  80% {
    opacity: 1;
  }
  100% {
    transform: translateX(200px);
    opacity: 0;
  }
}

/* Binary rain effect */
.binary-rain {
  position: absolute;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  opacity: 0.3;
}

.binary-column {
  position: absolute;
  top: -100%;
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--success);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  animation: binary-fall linear infinite;
  text-shadow: 0 0 8px var(--success);
}

.binary-column:nth-child(1) { left: 5%; animation-duration: 8s; }
.binary-column:nth-child(2) { left: 15%; animation-duration: 10s; animation-delay: 1s; }
.binary-column:nth-child(3) { left: 25%; animation-duration: 7s; animation-delay: 2s; }
.binary-column:nth-child(4) { left: 35%; animation-duration: 9s; animation-delay: 0.5s; }
.binary-column:nth-child(5) { left: 45%; animation-duration: 11s; animation-delay: 1.5s; }
.binary-column:nth-child(6) { left: 55%; animation-duration: 8.5s; animation-delay: 3s; }
.binary-column:nth-child(7) { left: 65%; animation-duration: 9.5s; animation-delay: 2.5s; }
.binary-column:nth-child(8) { left: 75%; animation-duration: 7.5s; animation-delay: 0.8s; }
.binary-column:nth-child(9) { left: 85%; animation-duration: 10.5s; animation-delay: 1.8s; }
.binary-column:nth-child(10) { left: 95%; animation-duration: 8.2s; animation-delay: 2.2s; }

@keyframes binary-fall {
  0% { transform: translateY(0); }
  100% { transform: translateY(200%); }
}

/* Circuit lines */
.circuit-line {
  position: absolute;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: circuit-pulse 2s ease-in-out infinite;
}

.circuit-line-1 { top: 20%; left: 10%; width: 80%; animation-delay: 0s; }
.circuit-line-2 { top: 40%; left: 5%; width: 70%; animation-delay: 0.5s; }
.circuit-line-3 { top: 60%; left: 15%; width: 75%; animation-delay: 1s; }
.circuit-line-4 { top: 80%; left: 8%; width: 85%; animation-delay: 1.5s; }

@keyframes circuit-pulse {
  0%, 100% { opacity: 0.2; }
  50% { opacity: 0.8; }
}

/* ═══════════════════════════════════════════════════════════
   CONSULTATION QUIZ / CUSTDEV FORM
   ═══════════════════════════════════════════════════════════ */

.quiz-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.quiz-overlay.active {
  opacity: 1;
  visibility: visible;
}

.quiz-container {
  width: 100%;
  max-width: 600px;
  padding: 24px;
}

.quiz-card {
  background: var(--bg-card);
  border: var(--card-border);
  border-radius: var(--border-radius);
  padding: 48px;
  box-shadow: var(--glow-effect);
  position: relative;
  overflow: hidden;
}

.quiz-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 24px;
  cursor: pointer;
  transition: color 0.3s;
}

.quiz-close:hover {
  color: var(--danger);
}

.quiz-progress {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
}

.quiz-progress-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: all 0.3s;
}

.quiz-progress-dot.active {
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
}

.quiz-progress-dot.completed {
  background: var(--success);
}

.quiz-step {
  display: none;
  animation: fadeIn 0.5s ease;
}

.quiz-step.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.quiz-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-h2);
  color: var(--accent);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.quiz-subtitle {
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: calc(var(--font-size-base) + 2px);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: rgba(0,0,0,0.3);
  border: 2px solid var(--border);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.3s;
}

.quiz-option:hover {
  border-color: var(--accent);
  background: rgba(0,0,0,0.5);
}

.quiz-option.selected {
  border-color: var(--accent);
  background: rgba(85, 255, 255, 0.1);
}

.quiz-option-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  font-size: 24px;
}

.quiz-option-text {
  flex: 1;
}

.quiz-option-title {
  font-weight: 600;
  margin-bottom: 4px;
}

.quiz-option-desc {
  font-size: calc(var(--font-size-base) - 2px);
  color: var(--text-muted);
}

.quiz-actions {
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.quiz-input {
  width: 100%;
  padding: 16px 20px;
  background: rgba(0,0,0,0.4);
  border: 2px solid var(--border);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  margin-bottom: 16px;
}

.quiz-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--glow-effect);
}

.quiz-textarea {
  min-height: 120px;
  resize: vertical;
}

.quiz-success {
  text-align: center;
  padding: 40px 0;
}

.quiz-success-icon {
  font-size: 64px;
  margin-bottom: 24px;
  animation: success-bounce 0.6s ease;
}

@keyframes success-bounce {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.2); }
}

.quiz-success-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-h2);
  color: var(--success);
  margin-bottom: 16px;
}

.quiz-success-text {
  color: var(--text-secondary);
  margin-bottom: 32px;
}