:root {
  --bg-base: #0a0d14;
  --bg-surface: #111726;
  --bg-card: #161f33;
  --bg-card-hover: #1c2742;
  --border-color: #263352;
  --border-focus: #3b82f6;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-primary: #38bdf8;
  --accent-primary-hover: #0284c7;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --code-bg: #090d16;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -4px rgba(0, 0, 0, 0.6);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

body.theme-alt {
  --accent-primary: #a855f7;
  --accent-primary-hover: #9333ea;
  --border-focus: #a855f7;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  background-color: rgba(17, 23, 38, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 14px 0;
}

.header-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.logo-icon {
  font-size: 24px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(16, 185, 129, 0.2));
  border: 1px solid rgba(56, 189, 248, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.status-indicator {
  font-size: 0.82rem;
  color: var(--accent-emerald);
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

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

.btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.btn-outline:hover {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--text-secondary);
}

/* Badges */
.badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-primary {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-primary);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.badge-success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-accent {
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-info {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

/* Hero Section */
.hero-section {
  padding: 48px 0 32px 0;
}

.hero-tag {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #ffffff;
  line-height: 1.2;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 800px;
  margin-bottom: 28px;
}

.specs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.spec-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, border-color 0.2s;
}

.spec-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
}

.spec-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.spec-val {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.spec-val code {
  font-family: var(--font-mono);
  color: var(--accent-primary);
  font-size: 0.95rem;
}

/* Alert Box */
.alert {
  display: flex;
  gap: 14px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin-bottom: 32px;
  font-size: 0.92rem;
  line-height: 1.5;
}

.alert-info {
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: #bae6fd;
}

.alert-icon {
  font-size: 1.25rem;
}

.alert code {
  font-family: var(--font-mono);
  background: rgba(0, 0, 0, 0.3);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent-primary);
}

/* Tabs */
.nav-tabs-wrapper {
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
}

.nav-tabs {
  display: flex;
  gap: 8px;
  min-width: max-content;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 12px 18px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.02);
}

.tab-btn.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
  background: rgba(56, 189, 248, 0.04);
}

/* Tab Content */
.tab-panel {
  display: none;
  animation: fadeIn 0.25s ease-in-out;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
}

.panel-header h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
}

.section-intro {
  color: var(--text-secondary);
  font-size: 0.98rem;
  margin-bottom: 24px;
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-md);
}

.card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.grid-2col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

/* Lists */
.step-list, .numbered-steps {
  padding-left: 20px;
  color: var(--text-secondary);
}

.step-list li, .numbered-steps li {
  margin-bottom: 12px;
  line-height: 1.6;
}

.step-list li strong, .numbered-steps li strong {
  color: var(--text-primary);
}

.numbered-steps ul {
  margin-top: 8px;
  padding-left: 20px;
}

/* Code Blocks */
.code-block-container {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin: 16px 0;
  overflow: hidden;
}

.code-header {
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-color);
  padding: 8px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.copy-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.copy-btn:hover {
  background: var(--accent-primary);
  color: #000;
  border-color: var(--accent-primary);
}

pre {
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.5;
  color: #e2e8f0;
}

code .highlight {
  color: #38bdf8;
  font-weight: 700;
}

code .comment {
  color: #64748b;
  font-style: italic;
}

code .text-error {
  color: #f43f5e;
  font-weight: 600;
}

/* Key Combo Box */
.key-combo-box {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 16px;
}

.combo-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.keys {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.key {
  background: #1e293b;
  color: #f8fafc;
  border: 1px solid #475569;
  border-bottom: 3px solid #334155;
  padding: 4px 10px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

.combo-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.menu-simulator {
  background: #000;
  border: 2px solid #334155;
  border-radius: var(--radius-md);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
}

.menu-screen .active-line {
  color: #38bdf8;
  font-weight: 700;
}

.menu-screen .text-dim {
  color: #64748b;
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border-color);
}

.timeline-item {
  position: relative;
  margin-bottom: 24px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-step {
  position: absolute;
  left: -32px;
  top: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 2px solid var(--accent-primary);
  color: var(--accent-primary);
  font-size: 0.78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.timeline-content h5 {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}

.timeline-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Comparison Table */
.comparison-section {
  margin: 48px 0;
}

.comparison-section h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}

.table-responsive {
  overflow-x: auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

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

.data-table th {
  background: var(--bg-surface);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
}

.tag-yes {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
}

.tag-no {
  background: rgba(244, 63, 94, 0.15);
  color: var(--accent-rose);
}

.rate-high {
  color: var(--accent-emerald);
  font-weight: 700;
}

.rate-med {
  color: var(--accent-amber);
  font-weight: 700;
}

.rate-low {
  color: var(--accent-rose);
  font-weight: 700;
}

/* Checklist Section */
.checklist-section {
  margin: 32px 0 48px 0;
}

.checklist-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.checklist-items {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
  padding: 10px 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.check-item:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.check-item input {
  margin-top: 4px;
  cursor: pointer;
}

.check-item.completed {
  text-decoration: line-through;
  opacity: 0.6;
}

/* Footer */
.site-footer {
  margin-top: auto;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 32px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

.footer-note {
  max-width: 700px;
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 1.75rem;
  }
  .specs-grid {
    grid-template-columns: 1fr 1fr;
  }
  .grid-2col {
    grid-template-columns: 1fr;
  }
}