/* ===== STUDYHUB GLOBAL CYBER THEME ===== */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* ===== CSS VARIABLES ===== */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #0d1220;
  --bg-card: rgba(13, 18, 32, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.03);

  --neon-cyan: #00fff5;
  --neon-green: #39ff14;
  --electric-blue: #3b82f6;
  --purple: #a855f7;
  --neon-pink: #ff006e;
  --orange: #f97316;

  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #475569;

  --border-glass: rgba(0, 255, 245, 0.1);
  --border-neon: rgba(0, 255, 245, 0.3);

  --glow-cyan: 0 0 20px rgba(0, 255, 245, 0.4);
  --glow-green: 0 0 20px rgba(57, 255, 20, 0.4);
  --glow-blue: 0 0 20px rgba(59, 130, 246, 0.4);
  --glow-purple: 0 0 20px rgba(168, 85, 247, 0.4);

  --font-code: 'JetBrains Mono', monospace;
  --font-body: 'Inter', sans-serif;
  --font-display: 'Plus Jakarta Sans', sans-serif;

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
}

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

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* ===== MATRIX RAIN CANVAS ===== */
#matrix-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.04;
  pointer-events: none;
}

/* ===== SCANLINE EFFECT ===== */
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.03) 2px,
    rgba(0, 0, 0, 0.03) 4px
  );
  pointer-events: none;
  z-index: 1;
}

/* ===== MAIN WRAPPER ===== */
.wrapper {
  position: relative;
  z-index: 2;
  min-height: 100vh;
}

/* ===== SIDEBAR ===== */
.sidebar {
  position: fixed;
  left: 0; top: 0;
  width: 260px;
  height: 100vh;
  background: rgba(10, 14, 23, 0.95);
  border-right: 1px solid var(--border-glass);
  backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: var(--transition);
  overflow-y: auto;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border-neon); border-radius: 2px; }

.sidebar-logo {
  padding: 24px 20px;
  border-bottom: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-logo .logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--neon-cyan), var(--electric-blue));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: var(--glow-cyan);
  animation: pulse-logo 3s ease-in-out infinite;
}

@keyframes pulse-logo {
  0%, 100% { box-shadow: 0 0 10px rgba(0, 255, 245, 0.4); }
  50% { box-shadow: 0 0 25px rgba(0, 255, 245, 0.8), 0 0 50px rgba(0, 255, 245, 0.3); }
}

.sidebar-logo .logo-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--neon-cyan);
  letter-spacing: -0.5px;
}

.sidebar-logo .logo-sub {
  font-family: var(--font-code);
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 1px;
  display: block;
}

.sidebar-section {
  padding: 16px 12px 8px;
}

.sidebar-section-title {
  font-family: var(--font-code);
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 0 8px;
  margin-bottom: 8px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition-fast);
  position: relative;
  margin-bottom: 2px;
}

.nav-link:hover {
  background: rgba(0, 255, 245, 0.06);
  color: var(--neon-cyan);
  transform: translateX(4px);
}

.nav-link.active {
  background: rgba(0, 255, 245, 0.1);
  color: var(--neon-cyan);
  border-left: 2px solid var(--neon-cyan);
}

.nav-link .nav-icon {
  font-size: 16px;
  width: 20px;
  text-align: center;
}

.nav-link .nav-badge {
  margin-left: auto;
  background: rgba(0, 255, 245, 0.15);
  color: var(--neon-cyan);
  font-family: var(--font-code);
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid rgba(0, 255, 245, 0.2);
}

.sidebar-footer {
  margin-top: auto;
  padding: 16px;
  border-top: 1px solid var(--border-glass);
}

.system-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-code);
  font-size: 11px;
  color: var(--text-muted);
}

.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--neon-green);
  animation: blink 2s ease-in-out infinite;
  box-shadow: 0 0 6px var(--neon-green);
}

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

/* ===== MAIN CONTENT ===== */
.main-content {
  margin-left: 260px;
  min-height: 100vh;
  padding: 0;
}

/* ===== TOP BAR ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 14, 23, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  padding: 12px 32px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-code);
  font-size: 13px;
  color: var(--text-muted);
  flex: 1;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition-fast);
}

.breadcrumb a:hover { color: var(--neon-cyan); }
.breadcrumb .sep { color: var(--text-muted); opacity: 0.5; }
.breadcrumb .current { color: var(--neon-cyan); }

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

/* ===== SEARCH BAR ===== */
.search-box {
  position: relative;
}

.search-input {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 8px 16px 8px 36px;
  color: var(--text-primary);
  font-family: var(--font-code);
  font-size: 13px;
  width: 240px;
  transition: var(--transition);
  outline: none;
}

.search-input::placeholder { color: var(--text-muted); }
.search-input:focus {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 0 2px rgba(0, 255, 245, 0.1);
  width: 280px;
}

.search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 14px;
}

/* ===== PAGE CONTENT ===== */
.page-content {
  padding: 32px;
}

/* ===== HERO HEADER ===== */
.hero-header {
  text-align: center;
  padding: 48px 0 32px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 255, 245, 0.08);
  border: 1px solid rgba(0, 255, 245, 0.2);
  border-radius: 100px;
  padding: 6px 16px;
  font-family: var(--font-code);
  font-size: 12px;
  color: var(--neon-cyan);
  letter-spacing: 1px;
  margin-bottom: 20px;
}

.hero-tag .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--neon-green);
  animation: blink 1.5s ease-in-out infinite;
  box-shadow: 0 0 6px var(--neon-green);
}

/* ===== GLITCH TEXT ===== */
.glitch-text {
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 800;
  color: var(--text-primary);
  position: relative;
  letter-spacing: -2px;
  line-height: 1.1;
}

.glitch-text .highlight {
  color: var(--neon-cyan);
  text-shadow: 0 0 30px rgba(0, 255, 245, 0.6);
}

.glitch-text::before,
.glitch-text::after {
  content: attr(data-text);
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
}

.glitch-text::before {
  color: var(--neon-cyan);
  animation: glitch1 4s infinite;
  clip-path: polygon(0 0, 100% 0, 100% 35%, 0 35%);
  transform: translateX(-3px);
  opacity: 0;
}

.glitch-text::after {
  color: var(--purple);
  animation: glitch2 4s infinite;
  clip-path: polygon(0 65%, 100% 65%, 100% 100%, 0 100%);
  transform: translateX(3px);
  opacity: 0;
}

@keyframes glitch1 {
  0%, 90%, 100% { opacity: 0; transform: translateX(-3px); }
  91%, 93% { opacity: 0.8; transform: translateX(-8px) skewX(-2deg); }
  92%, 94% { opacity: 0; transform: translateX(3px); }
}

@keyframes glitch2 {
  0%, 92%, 100% { opacity: 0; transform: translateX(3px); }
  93%, 95% { opacity: 0.8; transform: translateX(8px) skewX(2deg); }
  94%, 96% { opacity: 0; transform: translateX(-3px); }
}

/* ===== TYPING ANIMATION ===== */
.typing-text {
  font-family: var(--font-code);
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.typing-text .cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--neon-cyan);
  animation: cursor-blink 1s step-end infinite;
  margin-left: 2px;
}

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

/* ===== STATS BAR ===== */
.stats-bar {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 28px 0;
}

.stat-item {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 16px 24px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: var(--transition);
  min-width: 120px;
}

.stat-item:hover {
  border-color: var(--neon-cyan);
  box-shadow: var(--glow-cyan);
  transform: translateY(-2px);
}

.stat-value {
  font-family: var(--font-code);
  font-size: 28px;
  font-weight: 700;
  color: var(--neon-cyan);
  line-height: 1;
  display: block;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ===== COUNTDOWN ===== */
.countdown-stat .stat-value {
  color: var(--neon-green);
  font-size: 22px;
}

/* ===== GRID ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }

/* ===== CARDS ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(20px);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
  opacity: 0;
  transition: var(--transition);
}

.card:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 30px rgba(0, 255, 245, 0.1), 0 20px 40px rgba(0, 0, 0, 0.4);
  transform: translateY(-4px);
}

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

/* ===== MATKUL CARDS ===== */
.matkul-card {
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.card-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 16px;
}

.card-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.card-icon.cyan { background: rgba(0, 255, 245, 0.1); border: 1px solid rgba(0, 255, 245, 0.2); }
.card-icon.green { background: rgba(57, 255, 20, 0.1); border: 1px solid rgba(57, 255, 20, 0.2); }
.card-icon.blue { background: rgba(59, 130, 246, 0.1); border: 1px solid rgba(59, 130, 246, 0.2); }
.card-icon.purple { background: rgba(168, 85, 247, 0.1); border: 1px solid rgba(168, 85, 247, 0.2); }
.card-icon.orange { background: rgba(249, 115, 22, 0.1); border: 1px solid rgba(249, 115, 22, 0.2); }

.card-meta {
  flex: 1;
}

.card-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.card-subtitle {
  font-family: var(--font-code);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 100px;
  font-family: var(--font-code);
  font-size: 11px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.tag.cyan { background: rgba(0, 255, 245, 0.08); border-color: rgba(0, 255, 245, 0.2); color: var(--neon-cyan); }
.tag.green { background: rgba(57, 255, 20, 0.08); border-color: rgba(57, 255, 20, 0.2); color: var(--neon-green); }
.tag.blue { background: rgba(59, 130, 246, 0.08); border-color: rgba(59, 130, 246, 0.2); color: var(--electric-blue); }
.tag.purple { background: rgba(168, 85, 247, 0.08); border-color: rgba(168, 85, 247, 0.2); color: var(--purple); }
.tag.orange { background: rgba(249, 115, 22, 0.08); border-color: rgba(249, 115, 22, 0.2); color: var(--orange); }

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

.progress-bar-wrap {
  flex: 1;
  margin-right: 12px;
}

.progress-label {
  font-family: var(--font-code);
  font-size: 10px;
  color: var(--text-muted);
  margin-bottom: 4px;
  display: flex;
  justify-content: space-between;
}

.progress-bar {
  height: 4px;
  background: rgba(255,255,255,0.06);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--neon-cyan), var(--electric-blue));
  transition: width 1s ease;
  box-shadow: 0 0 8px var(--neon-cyan);
}

.btn-arrow {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: rgba(0, 255, 245, 0.08);
  border: 1px solid rgba(0, 255, 245, 0.2);
  color: var(--neon-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: var(--transition-fast);
  flex-shrink: 0;
}

.matkul-card:hover .btn-arrow {
  background: var(--neon-cyan);
  color: var(--bg-primary);
  box-shadow: var(--glow-cyan);
}

/* ===== SECTION HEADING ===== */
.section-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.section-heading h2 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

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

.section-heading .badge {
  font-family: var(--font-code);
  font-size: 11px;
  color: var(--neon-cyan);
  background: rgba(0, 255, 245, 0.08);
  border: 1px solid rgba(0, 255, 245, 0.2);
  padding: 3px 10px;
  border-radius: 100px;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  border: none;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--neon-cyan), var(--electric-blue));
  color: var(--bg-primary);
  box-shadow: 0 4px 15px rgba(0, 255, 245, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 255, 245, 0.5);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-neon);
  color: var(--neon-cyan);
}

.btn-outline:hover {
  background: rgba(0, 255, 245, 0.08);
  box-shadow: var(--glow-cyan);
}

.btn-sm { padding: 6px 14px; font-size: 12px; }

/* ===== CODE BLOCKS ===== */
.code-block {
  position: relative;
  margin: 16px 0;
  border-radius: var(--radius);
  overflow: hidden;
}

.code-header {
  background: rgba(255,255,255,0.04);
  padding: 8px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-glass);
}

.code-lang {
  font-family: var(--font-code);
  font-size: 11px;
  color: var(--neon-cyan);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border-glass);
  border-radius: 4px;
  padding: 3px 10px;
  color: var(--text-muted);
  font-family: var(--font-code);
  font-size: 11px;
  cursor: pointer;
  transition: var(--transition-fast);
}

.copy-btn:hover { border-color: var(--neon-cyan); color: var(--neon-cyan); }
.copy-btn.copied { color: var(--neon-green); border-color: var(--neon-green); }

pre code { font-family: var(--font-code) !important; font-size: 13px !important; }

/* ===== TABLE ===== */
.cyber-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-code);
  font-size: 13px;
  margin: 12px 0;
}

.cyber-table th {
  background: rgba(0, 255, 245, 0.08);
  color: var(--neon-cyan);
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  border: 1px solid var(--border-glass);
  font-size: 12px;
  letter-spacing: 0.5px;
}

.cyber-table td {
  padding: 10px 14px;
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  vertical-align: top;
}

.cyber-table tr:hover td { background: rgba(0, 255, 245, 0.03); }
.cyber-table code {
  background: rgba(0, 255, 245, 0.1);
  color: var(--neon-cyan);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12px;
}

/* ===== SECTION / MATERI ===== */
.materi-section {
  margin-bottom: 48px;
}

.materi-section h2 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  gap: 10px;
}

.materi-section h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 20px 0 12px;
}

.materi-section h4 {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--neon-cyan);
  margin: 14px 0 8px;
  letter-spacing: 0.3px;
}

.materi-section p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 12px;
}

.materi-section ul, .materi-section ol {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
  padding-left: 20px;
  margin-bottom: 12px;
}

.materi-section li { margin-bottom: 4px; }

.highlight-box {
  background: rgba(0, 255, 245, 0.05);
  border: 1px solid rgba(0, 255, 245, 0.15);
  border-left: 3px solid var(--neon-cyan);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin: 16px 0;
}

.highlight-box.green {
  background: rgba(57, 255, 20, 0.05);
  border-color: rgba(57, 255, 20, 0.15);
  border-left-color: var(--neon-green);
}

.highlight-box.purple {
  background: rgba(168, 85, 247, 0.05);
  border-color: rgba(168, 85, 247, 0.15);
  border-left-color: var(--purple);
}

.highlight-box.orange {
  background: rgba(249, 115, 22, 0.05);
  border-color: rgba(249, 115, 22, 0.15);
  border-left-color: var(--orange);
}

.highlight-box h4 {
  margin: 0 0 8px 0;
  font-size: 13px;
  font-weight: 600;
}

.highlight-box p, .highlight-box ul {
  margin: 0;
  font-size: 13px;
}

/* ===== TABS ===== */
.tab-nav {
  display: flex;
  gap: 4px;
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius);
  padding: 4px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.tab-btn {
  flex: 1;
  min-width: 120px;
  padding: 10px 16px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active {
  background: rgba(0, 255, 245, 0.1);
  color: var(--neon-cyan);
  border: 1px solid rgba(0, 255, 245, 0.2);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ===== QUIZ STUFF ===== */
.quiz-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(20px);
  margin-bottom: 20px;
}

.quiz-number {
  font-family: var(--font-code);
  font-size: 11px;
  color: var(--neon-cyan);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.quiz-question {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  line-height: 1.5;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-glass);
  cursor: pointer;
  transition: var(--transition-fast);
  font-size: 14px;
  color: var(--text-secondary);
}

.quiz-option:hover {
  border-color: var(--neon-cyan);
  background: rgba(0, 255, 245, 0.05);
  color: var(--text-primary);
}

.quiz-option.selected {
  border-color: var(--neon-cyan);
  background: rgba(0, 255, 245, 0.1);
  color: var(--neon-cyan);
}

.quiz-option.correct {
  border-color: var(--neon-green);
  background: rgba(57, 255, 20, 0.1);
  color: var(--neon-green);
}

.quiz-option.wrong {
  border-color: var(--neon-pink);
  background: rgba(255, 0, 110, 0.1);
  color: var(--neon-pink);
}

.option-label {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-code);
  font-size: 11px;
  flex-shrink: 0;
}

/* ===== SCROLL TO TOP ===== */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: rgba(0, 255, 245, 0.1);
  border: 1px solid rgba(0, 255, 245, 0.3);
  color: var(--neon-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  cursor: pointer;
  z-index: 200;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(10px);
}

.scroll-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.scroll-top:hover {
  background: var(--neon-cyan);
  color: var(--bg-primary);
  box-shadow: var(--glow-cyan);
}

/* ===== FOOTER ===== */
.site-footer {
  margin-left: 260px;
  background: rgba(10, 14, 23, 0.9);
  border-top: 1px solid var(--border-glass);
  padding: 20px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-code);
  font-size: 12px;
  color: var(--text-muted);
}

.site-footer .footer-brand {
  color: var(--neon-cyan);
}

/* ===== SOAL LATIHAN ===== */
.soal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(20px);
  margin-bottom: 24px;
}

.soal-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-glass);
}

.soal-number {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: rgba(0, 255, 245, 0.1);
  border: 1px solid rgba(0, 255, 245, 0.3);
  color: var(--neon-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-code);
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}

.soal-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.soal-sub {
  font-family: var(--font-code);
  font-size: 11px;
  color: var(--text-muted);
}

.toggle-answer {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  background: rgba(57, 255, 20, 0.08);
  border: 1px solid rgba(57, 255, 20, 0.2);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  color: var(--neon-green);
  font-family: var(--font-code);
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition-fast);
}

.toggle-answer:hover {
  background: rgba(57, 255, 20, 0.15);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.2);
}

.answer-section {
  display: none;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-glass);
}

.answer-section.visible { display: block; }

/* ===== STACK MEMORY TABLE ===== */
.stack-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-code);
  font-size: 12px;
  margin: 12px 0;
}

.stack-table th {
  background: rgba(168, 85, 247, 0.1);
  color: var(--purple);
  padding: 8px 12px;
  border: 1px solid rgba(168, 85, 247, 0.2);
  text-align: left;
  font-size: 11px;
  letter-spacing: 0.5px;
}

.stack-table td {
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
}

.stack-table tr.active td {
  background: rgba(0, 255, 245, 0.05);
  color: var(--neon-cyan);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .site-footer { margin-left: 0; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .page-content { padding: 16px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .grid-auto { grid-template-columns: 1fr; }
  .stats-bar { flex-direction: column; align-items: center; }
  .topbar { padding: 12px 16px; }
  .search-input { width: 160px; }
  .search-input:focus { width: 200px; }
  .scroll-top { right: 16px; bottom: 16px; }
}

/* ===== PRINT ===== */
@media print {
  .sidebar, .topbar, .scroll-top, .site-footer { display: none !important; }
  .main-content { margin-left: 0 !important; }
  body { background: white !important; color: black !important; }
  .card { border: 1px solid #ccc !important; box-shadow: none !important; }
  .glitch-text { color: black !important; text-shadow: none !important; }
  .glitch-text .highlight { color: #0066cc !important; }
}

/* ===== MOBILE MENU TOGGLE ===== */
.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-glass);
  border-radius: 8px;
  padding: 8px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 18px;
}

@media (max-width: 1024px) {
  .menu-toggle { display: flex; align-items: center; }
  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 99;
    backdrop-filter: blur(4px);
  }
  .sidebar-overlay.visible { display: block; }
}

/* ===== CASE STUDY CARDS ===== */
.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(20px);
  margin-bottom: 20px;
}

.case-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
}

.case-number {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: rgba(249, 115, 22, 0.1);
  border: 1px solid rgba(249, 115, 22, 0.3);
  color: var(--orange);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-code);
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}

.case-title { font-family: var(--font-display); font-size: 16px; font-weight: 700; color: var(--text-primary); }
.case-type { font-family: var(--font-code); font-size: 11px; color: var(--text-muted); letter-spacing: 1px; }

.step-list { list-style: none; padding: 0; }
.step-list li {
  display: flex;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  font-size: 13px;
  color: var(--text-secondary);
}
.step-list li:last-child { border-bottom: none; }
.step-num {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: rgba(0, 255, 245, 0.1);
  color: var(--neon-cyan);
  font-family: var(--font-code);
  font-size: 10px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ===== PROGRESS CHECK ===== */
.progress-check {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.02);
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  user-select: none;
}

.progress-check:hover {
  background: rgba(57, 255, 20, 0.05);
  border-color: rgba(57, 255, 20, 0.15);
}

.progress-check input[type="checkbox"] {
  width: 16px; height: 16px;
  accent-color: var(--neon-green);
  cursor: pointer;
}

.progress-check.done {
  color: var(--neon-green);
  background: rgba(57, 255, 20, 0.05);
  border-color: rgba(57, 255, 20, 0.15);
  text-decoration: line-through;
  text-decoration-color: rgba(57, 255, 20, 0.4);
}