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

:root {
  --bg: #0a0a0a;
  --bg-card: #141414;
  --bg-hover: #1a1a1a;
  --border: #2a2a2a;
  --text: #e0e0e0;
  --text-dim: #888;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --white: #f5f5f5;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}

/* Auth Gate */
.auth-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 48px;
  max-width: 420px;
  width: 90%;
  text-align: center;
}

.auth-card h1 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 8px;
}

.auth-card p {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin-bottom: 32px;
}

.auth-card input {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--white);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
  margin-bottom: 16px;
}

.auth-card input:focus {
  border-color: var(--accent);
}

.auth-card button {
  width: 100%;
  padding: 14px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.auth-card button:hover {
  background: var(--accent-hover);
}

.auth-error {
  color: #ef4444;
  font-size: 0.875rem;
  margin-top: 12px;
  display: none;
}

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-brand {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--white);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 16px;
  margin-left: auto;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
}

/* Landing Page */
.landing {
  max-width: 900px;
  margin: 0 auto;
  padding: 80px 24px;
}

.landing h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
}

.landing .subtitle {
  color: var(--text-dim);
  font-size: 1.15rem;
  margin-bottom: 60px;
}

.doc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 32px;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
  display: block;
}

.doc-card:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.doc-card .label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 16px;
}

.doc-card h2 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 10px;
}

.doc-card p {
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.6;
}

.doc-card .arrow {
  display: inline-block;
  margin-top: 16px;
  color: var(--accent);
  font-size: 0.9rem;
}

/* Document Pages */
.doc-layout {
  display: flex;
  max-width: 1200px;
  margin: 0 auto;
}

.doc-sidebar {
  position: sticky;
  top: 56px;
  width: 260px;
  min-width: 260px;
  height: calc(100vh - 56px);
  overflow-y: auto;
  padding: 32px 24px;
  border-right: 1px solid var(--border);
}

.doc-sidebar h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.doc-sidebar ul {
  list-style: none;
}

.doc-sidebar li {
  margin-bottom: 6px;
}

.doc-sidebar a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.85rem;
  display: block;
  padding: 4px 0;
  transition: color 0.2s;
}

.doc-sidebar a:hover {
  color: var(--white);
}

.doc-content {
  flex: 1;
  min-width: 0;
  padding: 48px 48px 120px;
}

.doc-content h1 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
  line-height: 1.3;
}

.doc-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--white);
  margin-top: 48px;
  margin-bottom: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.doc-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--white);
  margin-top: 32px;
  margin-bottom: 12px;
}

.doc-content h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
  margin-top: 24px;
  margin-bottom: 8px;
}

.doc-content p {
  margin-bottom: 16px;
}

.doc-content ul, .doc-content ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.doc-content li {
  margin-bottom: 6px;
}

.doc-content strong {
  color: var(--white);
}

.doc-content a {
  color: var(--accent);
  text-decoration: none;
}

.doc-content a:hover {
  text-decoration: underline;
}

.doc-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 12px 20px;
  margin: 24px 0;
  background: rgba(59, 130, 246, 0.05);
  border-radius: 0 8px 8px 0;
}

.doc-content code {
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: 'SF Mono', 'Fira Code', monospace;
}

.doc-content pre {
  background: #111;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  overflow-x: auto;
  margin: 24px 0;
}

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

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.9rem;
}

.doc-content th {
  text-align: left;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--white);
  font-weight: 600;
}

.doc-content td {
  padding: 10px 16px;
  border: 1px solid var(--border);
}

.doc-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}

.doc-meta {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-bottom: 40px;
}

/* Mobile */
@media (max-width: 768px) {
  .landing h1 {
    font-size: 1.8rem;
  }
  .doc-grid {
    grid-template-columns: 1fr;
  }
  .doc-sidebar {
    display: none;
  }
  .doc-content {
    padding: 24px 16px 80px;
  }
  .doc-content h1 {
    font-size: 1.6rem;
  }
  .doc-content h2 {
    font-size: 1.25rem;
  }
  .auth-card {
    padding: 32px 24px;
  }
  .nav {
    padding: 12px 16px;
  }
}