:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-card-hover: rgba(30, 41, 59, 0.95);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-primary: #10b981;
  --accent-secondary: #3b82f6;
  --accent-warning: #f59e0b;
  --accent-danger: #ef4444;
  --accent-purple: #8b5cf6;
  --border-color: rgba(148, 163, 184, 0.15);
  --code-bg: #090d16;
  --shadow-lg: 0 10px 30px -5px rgba(0, 0, 0, 0.5);
  --radius-md: 12px;
  --radius-lg: 16px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border-color: rgba(15, 23, 42, 0.12);
  --code-bg: #1e293b;
  --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
}

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

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;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(16, 185, 129, 0.08) 0%, transparent 35%),
    radial-gradient(circle at 85% 80%, rgba(59, 130, 246, 0.08) 0%, transparent 35%);
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(11, 15, 25, 0.8);
  border-bottom: 1px solid var(--border-color);
  padding: 0.9rem 2rem;
}

[data-theme="light"] .navbar {
  background: rgba(248, 250, 252, 0.85);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.2rem;
}

.brand img {
  width: 36px;
  height: 36px;
}

.brand-badge {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-primary);
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(148, 163, 184, 0.12);
}

.nav-links a.active {
  color: var(--accent-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  text-decoration: none;
  font-family: inherit;
}

.btn-primary {
  background: var(--accent-primary);
  color: #06281e;
}

.btn-primary:hover {
  background: #34d399;
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  border-color: var(--accent-primary);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.25);
}

.btn-icon {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
}

/* Main Container */
.container {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem;
  flex: 1;
}

/* Hero Section */
.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2.5rem;
  align-items: center;
  padding: 2.5rem 0 3rem;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-primary);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  margin-bottom: 1.2rem;
}

.hero h1 {
  font-size: 2.8rem;
  line-height: 1.15;
  margin-bottom: 1.2rem;
  letter-spacing: -0.02em;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 1.8rem;
  max-width: 600px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Cards & Grids */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  border-color: rgba(16, 185, 129, 0.35);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.section-header {
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 1rem;
}

.section-header h2 {
  font-size: 1.75rem;
  letter-spacing: -0.01em;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Status Badges */
.badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  font-weight: 600;
}

.badge-success {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  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);
}

.badge-danger {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

/* Code / Terminal Blocks */
.code-window {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  color: #e2e8f0;
}

.code-header {
  background: rgba(255, 255, 255, 0.04);
  padding: 0.6rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #94a3b8;
}

.window-dots {
  display: flex;
  gap: 6px;
}

.dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

pre.code-content {
  padding: 1.2rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.65;
  color: #e2e8f0;
}

/* Interactive Controls & Checkboxes */
.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.toggle-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.85rem;
  border-radius: 10px;
  background: rgba(148, 163, 184, 0.05);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: background 0.2s ease;
}

.toggle-item:hover {
  background: rgba(148, 163, 184, 0.1);
}

.toggle-item input[type="checkbox"] {
  accent-color: var(--accent-primary);
  width: 18px;
  height: 18px;
  margin-top: 0.2rem;
  cursor: pointer;
}

.toggle-info strong {
  display: block;
  font-size: 0.95rem;
}

.toggle-info span {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
}

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

table.data-table th,
table.data-table td {
  text-align: left;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

table.data-table th {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

table.data-table td.mono {
  font-family: var(--font-mono);
  font-size: 0.84rem;
}

/* Metrics KPI */
.kpi-value {
  font-size: 2.1rem;
  font-weight: 800;
  font-family: var(--font-mono);
  margin: 0.4rem 0;
}

.kpi-sub {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Checklist Progress */
.progress-bar-bg {
  width: 100%;
  height: 10px;
  background: rgba(148, 163, 184, 0.15);
  border-radius: 999px;
  overflow: hidden;
  margin: 0.75rem 0 1.25rem;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  width: 0%;
  transition: width 0.3s ease;
}

/* Error Pages (404 / 50x) */
.error-page {
  text-align: center;
  max-width: 640px;
  margin: 4rem auto;
  padding: 2.5rem;
}

.error-code {
  font-size: 6rem;
  font-weight: 900;
  font-family: var(--font-mono);
  line-height: 1;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 2rem;
  margin-top: 3rem;
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.footer-content {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
}