/* ���─ Variables ────────────────────────────────────────────────────────────��─ */
:root {
  --sidebar-bg: #1e2228;
  --sidebar-text: #cdd6f4;
  --sidebar-active-bg: rgba(61,126,255,0.15);
  --sidebar-active-border: #3d7eff;
  --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: #3d7eff;
  --toc-text: #6e7681;
  --toc-active: #3d7eff;
  --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: #ffffff;
  text-decoration: none;
  display: block;
  letter-spacing: -0.01em;
}
.sidebar-logo:hover { color: #e6edf3; }

.sidebar-version {
  display: inline-block;
  margin-top: 6px;
  padding: 2px 8px;
  background: rgba(61,126,255,0.2);
  color: #79c0ff;
  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 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%, #3d7eff 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(61,126,255,0.12);
}

.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;
}

/* ── 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; }

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

/* ── Hamburger (hidden on desktop) ──────────────────────────────────────── */
.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); }

@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; }
  pre { font-size: 0.8rem; }
  .hero h1 { font-size: 1.6rem; }
  .hero-buttons { flex-wrap: wrap; }
  .feature-grid { grid-template-columns: 1fr; }
}

/* ── Method/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;
}

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

/* ── Labels / 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-green { background: #dcfce7; color: #166534; }
.badge-orange { background: #ffedd5; color: #9a3412; }
.badge-gray { background: #f3f4f6; color: #374151; }