/* ── Variables ───────────────────────────────────────────────────────────── */
:root {
  --sidebar-bg: #1e2228;
  --sidebar-text: #cdd6f4;
  --sidebar-active-bg: rgba(0,188,212,0.15);
  --sidebar-active-border: #00bcd4;
  --sidebar-hover-bg: rgba(255,255,255,0.06);
  --body-bg: #0d1117;
  --content-bg: #0d1117;
  --card-bg: #ffffff;
  --card-text: #24292f;
  --heading-border: #d0d7de;
  --code-bg: #282c34;
  --note-bg: #dbeafe;
  --note-border: #3b82f6;
  --tip-bg: #dcfce7;
  --tip-border: #22c55e;
  --warning-bg: #ffedd5;
  --warning-border: #f97316;
  --link-color: #0284c7;
  --toc-text: #6e7681;
  --toc-active: #0284c7;
  --topbar-bg: #161b22;
  --topbar-border: #30363d;
  --sidebar-width: 260px;
  --toc-width: 220px;
}

/* ── Reset ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--body-bg);
  color: var(--card-text);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ── Top bar ─────────────────────────────────────────────────────────────── */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 48px;
  background: var(--topbar-bg);
  border-bottom: 1px solid var(--topbar-border);
  display: flex;
  align-items: center;
  padding: 0 16px 0 calc(var(--sidebar-width) + 16px);
  z-index: 100;
  gap: 8px;
  font-size: 0.85rem;
  color: #8b949e;
}
.topbar-home { color: var(--link-color); text-decoration: none; font-weight: 600; }
.topbar-home:hover { text-decoration: underline; }
.topbar-sep { color: #444d56; }
.topbar-current { color: #c9d1d9; }

/* ── Sidebar ─────────────────────────────────────────────────────────────── */
.sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  overflow-y: auto;
  z-index: 200;
  display: flex;
  flex-direction: column;
  padding-bottom: 24px;
}

.sidebar-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: #00bcd4;
  text-decoration: none;
  display: block;
  letter-spacing: -0.01em;
}
.sidebar-logo:hover { color: #4dd0e1; }

.sidebar-tagline {
  display: block;
  margin-top: 4px;
  font-size: 0.72rem;
  color: rgba(205,214,244,0.45);
  line-height: 1.4;
}

.sidebar-version {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 8px;
  background: rgba(0,188,212,0.2);
  color: #4dd0e1;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.sidebar-nav { padding: 16px 0; flex: 1; }

.nav-group { margin-bottom: 4px; }

.nav-group-label {
  padding: 6px 20px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(205,214,244,0.45);
  user-select: none;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  padding: 7px 20px;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 0.875rem;
  border-left: 3px solid transparent;
  transition: background 0.1s, color 0.1s;
  opacity: 0.85;
}
.sidebar-nav a:hover { background: var(--sidebar-hover-bg); opacity: 1; }
.sidebar-nav a.active {
  background: var(--sidebar-active-bg);
  border-left-color: var(--sidebar-active-border);
  color: #ffffff;
  font-weight: 600;
  opacity: 1;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.sidebar-footer a {
  color: rgba(205,214,244,0.55);
  text-decoration: none;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 6px;
}
.sidebar-footer a:hover { color: var(--sidebar-text); }

/* ── Main layout ─────────────────────────────────────────────────────────── */
.layout {
  margin-left: var(--sidebar-width);
  margin-top: 48px;
  display: flex;
  min-height: calc(100vh - 48px);
}

.content { flex: 1; min-width: 0; padding: 32px 24px; }

.content-card {
  background: var(--card-bg);
  color: var(--card-text);
  border-radius: 8px;
  padding: 40px 48px;
  width: 100%;
  box-shadow: 0 1px 3px rgba(0,0,0,0.25), 0 4px 16px rgba(0,0,0,0.1);
}

/* ── TOC sidebar ─────────────────────────────────────────────────────────── */
.toc-sidebar {
  width: var(--toc-width);
  flex-shrink: 0;
  padding: 32px 0;
}

.toc-inner {
  position: sticky;
  top: 72px;
  padding: 0 16px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}

.toc-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #8b949e;
  margin-bottom: 12px;
}

#toc { display: flex; flex-direction: column; gap: 0; }

#toc a {
  display: block;
  padding: 4px 8px;
  color: var(--toc-text);
  text-decoration: none;
  font-size: 0.8rem;
  border-left: 2px solid transparent;
  line-height: 1.4;
  transition: color 0.1s, border-color 0.1s;
}
#toc a.toc-h3 { padding-left: 20px; font-size: 0.76rem; opacity: 0.8; }
#toc a:hover { color: var(--toc-active); }
#toc a.active { color: var(--toc-active); border-left-color: var(--toc-active); font-weight: 500; }

/* ── Typography ──────────────────────────────────────────────────────────── */
.content-card h1 {
  font-size: 2rem;
  font-weight: 700;
  color: #1a1f2e;
  margin-bottom: 12px;
  line-height: 1.2;
}

.content-card h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: #1a1f2e;
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--heading-border);
  position: relative;
}

.content-card h2 .anchor-icon {
  visibility: hidden;
  font-size: 0.9rem;
  margin-left: 8px;
  color: var(--link-color);
  text-decoration: none;
}
.content-card h2:hover .anchor-icon { visibility: visible; }

.content-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: #24292f;
  margin-top: 28px;
  margin-bottom: 10px;
}

.content-card h4 {
  font-size: 1rem;
  font-weight: 600;
  color: #24292f;
  margin-top: 20px;
  margin-bottom: 8px;
}

.content-card p { margin-bottom: 14px; color: #374151; line-height: 1.7; }

.content-card a:not(.btn) { color: var(--link-color); text-decoration: none; }
.content-card a:not(.btn):hover { text-decoration: underline; }

.content-card ul, .content-card ol { margin: 0 0 16px 24px; color: #374151; }
.content-card li { margin-bottom: 5px; line-height: 1.6; }

.content-card code:not(pre code) {
  background: #f0f2f5;
  color: #c7254e;
  padding: 2px 5px;
  border-radius: 4px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.87em;
}

/* ── Code blocks ─────────────────────────────────────────────────────────── */
.content-card pre {
  position: relative;
  margin: 0 0 20px;
  border-radius: 8px;
  overflow: visible;
}

.content-card pre code {
  display: block;
  padding: 20px 20px 16px;
  border-radius: 8px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  overflow-x: auto;
}

.lang-badge {
  position: absolute;
  top: -10px;
  right: 48px;
  background: #3d4451;
  color: #a0a8b8;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 4px;
  font-family: system-ui, sans-serif;
  pointer-events: none;
  z-index: 2;
}

.copy-btn {
  position: absolute;
  top: 8px; right: 10px;
  width: 30px; height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.08);
  color: #8b949e;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 5px;
  padding: 0;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  z-index: 3;
  line-height: 1;
}
.copy-btn:hover { background: rgba(255,255,255,0.15); color: #e6edf3; }
.copy-btn.copied {
  color: #3fb950;
  border-color: rgba(63,185,80,0.3);
  background: rgba(63,185,80,0.1);
}

/* ── Tables ──────────────────────────────────────────────────────────────── */
.content-card table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
  font-size: 0.9rem;
  overflow-x: auto;
  display: block;
}
.content-card th {
  background: #f6f8fa;
  color: #24292f;
  font-weight: 600;
  text-align: left;
  padding: 10px 16px;
  border-bottom: 2px solid #d0d7de;
  white-space: nowrap;
}
.content-card td { padding: 9px 16px; border-bottom: 1px solid #e1e5ea; vertical-align: top; }
.content-card tr:nth-child(even) td { background: #f9fafb; }
.content-card tr:hover td { background: #f0f4f8; }

/* ── Callout boxes ───────────────────────────────────────────────────────── */
.callout {
  padding: 14px 18px;
  border-radius: 6px;
  margin-bottom: 20px;
  font-size: 0.9rem;
  line-height: 1.6;
}
.callout p:last-child { margin-bottom: 0; }
.callout-note { background: var(--note-bg); border-left: 4px solid var(--note-border); color: #1e40af; }
.callout-tip  { background: var(--tip-bg);  border-left: 4px solid var(--tip-border);  color: #166534; }
.callout-warning { background: var(--warning-bg); border-left: 4px solid var(--warning-border); color: #9a3412; }
.callout strong { display: block; margin-bottom: 4px; font-weight: 700; }

/* ── Hero section ────────────────────────────────────────────────────────── */
.hero {
  padding: 32px 0 24px;
  border-bottom: 1px solid var(--heading-border);
  margin-bottom: 32px;
}
.hero h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #1a1f2e 0%, #0284c7 60%, #00bcd4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p { font-size: 1.05rem; color: #4b5563; max-width: 620px; line-height: 1.7; }
.hero-buttons { display: flex; gap: 12px; margin-top: 20px; }

.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: opacity 0.15s, transform 0.1s;
}
.btn:hover { opacity: 0.88; transform: translateY(-1px); text-decoration: none; }
.btn-primary { background: var(--link-color); color: #ffffff; }
.btn-secondary { background: #f0f2f5; color: #24292f; border: 1px solid #d0d7de; }

/* ── Feature grid ────────────────────────────────────────────────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 24px;
}
.feature-card {
  background: #f6f8fa;
  border: 1px solid #e1e5ea;
  border-radius: 8px;
  padding: 18px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.feature-card:hover {
  border-color: var(--link-color);
  box-shadow: 0 2px 8px rgba(2,132,199,0.12);
}
.feature-card h3 { font-size: 0.95rem; margin-top: 0; margin-bottom: 6px; color: #1a1f2e; }
.feature-card p { font-size: 0.83rem; color: #6b7280; margin-bottom: 0; line-height: 1.5; }
.feature-icon { font-size: 1.4rem; margin-bottom: 8px; display: block; }

/* ── Screenshots ─────────────────────────────────────────────────────────── */
.screenshot-wrap {
  border: 1px solid #e1e5ea;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 20px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.1);
}
.screenshot-wrap img { display: block; width: 100%; height: auto; }
.screenshot-caption {
  background: #f6f8fa;
  border-top: 1px solid #e1e5ea;
  padding: 8px 14px;
  font-size: 0.82rem;
  color: #6b7280;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

/* ── Schema diagram ──────────────────────────────────────────────────────── */
.schema-table {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.83rem;
  border: 1px solid #e1e5ea;
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 20px;
}
.schema-table-header {
  background: #00bcd4;
  color: #fff;
  font-weight: 700;
  padding: 6px 14px;
  font-size: 0.85rem;
}
.schema-table-body { background: #1e2228; padding: 8px 0; }
.schema-row {
  display: flex;
  justify-content: space-between;
  padding: 3px 14px;
  color: #cdd6f4;
  font-size: 0.78rem;
}
.schema-row:nth-child(even) { background: rgba(255,255,255,0.03); }
.schema-col-fk { color: #00bcd4; font-weight: 600; }
.schema-col-type { color: #a0a8b8; }

/* ── Relationship diagram ────────────────────────────────────────────────── */
.rel-diagram {
  background: #f6f8fa;
  border: 1px solid #e1e5ea;
  border-radius: 8px;
  padding: 20px 24px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.82rem;
  color: #374151;
  line-height: 2;
  margin-bottom: 20px;
  overflow-x: auto;
  white-space: pre;
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
footer {
  margin-top: 48px;
  padding: 20px 0;
  border-top: 1px solid var(--heading-border);
  text-align: center;
  font-size: 0.8rem;
  color: #6b7280;
}
footer a { color: var(--link-color); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* ── Dividers ────────────────────────────────────────────────────────────── */
.content-card hr { border: none; border-top: 1px solid var(--heading-border); margin: 32px 0; }

/* ── Badges ──────────────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.badge-blue   { background: #dbeafe; color: #1d4ed8; }
.badge-cyan   { background: #cffafe; color: #0e7490; }
.badge-green  { background: #dcfce7; color: #166534; }
.badge-orange { background: #ffedd5; color: #9a3412; }
.badge-gray   { background: #f3f4f6; color: #374151; }

/* ── API tables ──────────────────────────────────────────────────────────── */
.api-table { font-size: 0.85rem; }
.api-table td:first-child {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.8rem;
  color: #c7254e;
  white-space: nowrap;
  background: #fdf7f7;
}

/* ── Step list ───────────────────────────────────────────────────────────── */
.step-list { counter-reset: steps; list-style: none; margin-left: 0; padding: 0; }
.step-list li {
  counter-increment: steps;
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  align-items: flex-start;
}
.step-list li::before {
  content: counter(steps);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  background: var(--link-color);
  color: white;
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}
.step-list li > div { flex: 1; }
.step-list li strong { display: block; margin-bottom: 4px; }

/* ── Hamburger ───────────────────────────────────────────────────────────── */
.hamburger {
  display: none;
  background: none;
  border: none;
  color: #8b949e;
  font-size: 1.25rem;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 4px;
  line-height: 1;
  flex-shrink: 0;
}
.hamburger:hover { color: #c9d1d9; background: rgba(255,255,255,0.06); }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 1100px) { .toc-sidebar { display: none; } }

@media (max-width: 768px) {
  .hamburger { display: flex; align-items: center; }
  .sidebar { transform: translateX(-100%); transition: transform 0.25s ease; }
  .sidebar.open { transform: translateX(0); }
  .layout { margin-left: 0; }
  .topbar { padding-left: 16px; }
  .content-card { padding: 24px 20px; }
  .content { padding: 16px 12px; }
  .hero h1 { font-size: 1.6rem; }
  .hero-buttons { flex-wrap: wrap; }
  .feature-grid { grid-template-columns: 1fr; }
  .screenshot-grid { grid-template-columns: 1fr; }
}