@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Tourney:wght@400;700;900&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --black: #0a0a0a;
  --white: #f5f5f5;
  --gray-100: #e8e8e8;
  --gray-200: #d0d0d0;
  --gray-400: #888888;
  --gray-600: #444444;
  --gray-800: #1c1c1c;
  --blue: #2563eb;
  --blue-dim: #1e40af;
  --blue-light: #3b82f6;
  --blue-pale: #dbeafe;
  --border: 1px solid #2a2a2a;
  --border-light: 1px solid #e0e0e0;
  --font-main: 'Space Grotesk', sans-serif;
  --font-display: 'Tourney', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --sidebar-w: 260px;
  --header-h: 56px;
  --radius: 0px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 15px;
}

body {
  font-family: var(--font-main);
  background: var(--black);
  color: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--blue-light);
  text-decoration: none;
}

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

::selection {
  background: var(--blue);
  color: var(--white);
}

::-webkit-scrollbar {
  width: 4px;
  height: 4px;
}
::-webkit-scrollbar-track {
  background: var(--black);
}
::-webkit-scrollbar-thumb {
  background: var(--gray-600);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--blue);
}

#top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: var(--black);
  border-bottom: var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 1000;
}

#top-bar .logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--white);
  display: flex;
  align-items: center;
  gap: 8px;
}

#top-bar .logo span {
  color: var(--blue-light);
}

#top-bar nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

#top-bar nav a {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--gray-400);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 6px 12px;
  border: var(--border);
  transition: all 0.15s;
}

#top-bar nav a:hover,
#top-bar nav a.active {
  color: var(--white);
  border-color: var(--blue);
  background: rgba(37, 99, 235, 0.08);
}

#top-bar .github-link {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--white);
  background: var(--blue);
  padding: 7px 14px;
  letter-spacing: 0.04em;
  transition: background 0.15s;
}

#top-bar .github-link:hover {
  background: var(--blue-light);
  color: var(--white);
}

#hamburger {
  display: none;
  background: none;
  border: var(--border);
  color: var(--white);
  width: 36px;
  height: 36px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

#hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--white);
  transition: all 0.2s;
}

#hamburger.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
#hamburger.open span:nth-child(2) {
  opacity: 0;
}
#hamburger.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

#layout {
  display: flex;
  min-height: 100vh;
  padding-top: var(--header-h);
}

#sidebar {
  position: fixed;
  top: var(--header-h);
  left: 0;
  width: var(--sidebar-w);
  height: calc(100vh - var(--header-h));
  background: var(--black);
  border-right: var(--border);
  overflow-y: auto;
  z-index: 900;
  padding: 24px 0 40px;
}

#sidebar .sidebar-section {
  margin-bottom: 4px;
}

#sidebar .sidebar-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray-600);
  padding: 16px 20px 6px;
  display: block;
}

#sidebar a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 20px;
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--gray-400);
  border-left: 2px solid transparent;
  transition: all 0.12s;
  line-height: 1.3;
}

#sidebar a:hover {
  color: var(--white);
  border-left-color: var(--gray-600);
  background: rgba(255,255,255,0.03);
}

#sidebar a.active {
  color: var(--blue-light);
  border-left-color: var(--blue);
  background: rgba(37, 99, 235, 0.06);
  font-weight: 500;
}

#sidebar a .dot {
  width: 4px;
  height: 4px;
  border-radius: 0;
  background: currentColor;
  flex-shrink: 0;
}

#main {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-width: 0;
}

#content {
  max-width: 860px;
  margin: 0 auto;
  padding: 56px 48px 100px;
}

.section {
  padding-top: 64px;
  margin-top: -20px;
}

.section + .section {
  border-top: var(--border);
}

.hero {
  padding: 72px 0 56px;
  border-bottom: var(--border);
  margin-bottom: 0;
}

.hero-tag {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blue-light);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-tag::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 1px;
  background: var(--blue-light);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.05;
  color: var(--white);
  margin-bottom: 20px;
}

.hero h1 em {
  font-style: normal;
  color: var(--blue-light);
}

.hero p {
  font-size: 1rem;
  color: var(--gray-400);
  max-width: 520px;
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.badge {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 10px;
  border: var(--border);
  color: var(--gray-400);
}

.badge.blue {
  border-color: var(--blue);
  color: var(--blue-light);
  background: rgba(37,99,235,0.06);
}

.badge.green {
  border-color: #16a34a;
  color: #4ade80;
  background: rgba(22,163,74,0.06);
}

.hero-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  font-family: var(--font-main);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
  text-decoration: none;
}

.btn-primary {
  background: var(--blue);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--blue-light);
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--gray-200);
  border: var(--border);
}

.btn-outline:hover {
  border-color: var(--gray-400);
  color: var(--white);
}

h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
  margin-bottom: 20px;
  margin-top: 48px;
  display: flex;
  align-items: center;
  gap: 10px;
}

h2:first-child {
  margin-top: 0;
}

h2::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 18px;
  background: var(--blue);
  flex-shrink: 0;
}

h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 12px;
  margin-top: 28px;
  letter-spacing: 0.01em;
}

p {
  color: var(--gray-200);
  margin-bottom: 16px;
  font-size: 0.9rem;
  line-height: 1.72;
}

ul, ol {
  color: var(--gray-200);
  font-size: 0.9rem;
  padding-left: 20px;
  margin-bottom: 16px;
}

li {
  margin-bottom: 6px;
  line-height: 1.65;
}

code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--gray-800);
  color: var(--blue-light);
  padding: 2px 6px;
  border: 1px solid #2a2a2a;
}

pre {
  background: #111111;
  border: var(--border);
  border-left: 3px solid var(--blue);
  padding: 20px 22px;
  overflow-x: auto;
  margin: 16px 0 24px;
  position: relative;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--gray-100);
  font-size: 0.8rem;
  line-height: 1.7;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--gray-800);
  border: var(--border);
  color: var(--gray-400);
  font-size: 0.68rem;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  cursor: pointer;
  text-transform: uppercase;
  transition: all 0.15s;
}

.copy-btn:hover {
  color: var(--white);
  border-color: var(--blue);
}

.copy-btn.copied {
  color: #4ade80;
  border-color: #16a34a;
}

.table-wrap {
  overflow-x: auto;
  margin: 16px 0 24px;
  border: var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

thead tr {
  background: #111;
  border-bottom: var(--border);
}

thead th {
  padding: 10px 16px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray-400);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid #1a1a1a;
  transition: background 0.1s;
}

tbody tr:last-child {
  border-bottom: none;
}

tbody tr:hover {
  background: rgba(255,255,255,0.02);
}

td {
  padding: 10px 16px;
  color: var(--gray-200);
  vertical-align: top;
  line-height: 1.5;
}

td:first-child {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--blue-light);
  white-space: nowrap;
}

td:last-child {
  color: var(--gray-400);
  font-size: 0.82rem;
}

.callout {
  border: var(--border);
  border-left: 3px solid var(--blue);
  background: rgba(37,99,235,0.04);
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 0.85rem;
  color: var(--gray-200);
  line-height: 1.6;
}

.callout.warn {
  border-left-color: #f59e0b;
  background: rgba(245,158,11,0.04);
}

.callout strong {
  color: var(--white);
  font-weight: 600;
}

.method-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 12px 0 24px;
}

.method-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 8px 12px;
  border: var(--border);
  background: #0e0e0e;
  font-size: 0.82rem;
  transition: border-color 0.12s;
}

.method-item:hover {
  border-color: var(--blue);
}

.method-item .method-name {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--blue-light);
  min-width: 180px;
  flex-shrink: 0;
}

.method-item .method-desc {
  color: var(--gray-400);
  font-size: 0.82rem;
}

.section-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  margin: 16px 0 24px;
}

.grid-card {
  background: #0e0e0e;
  border: var(--border);
  padding: 18px;
  transition: border-color 0.12s;
}

.grid-card:hover {
  border-color: var(--blue);
}

.grid-card h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--blue-light);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.grid-card p {
  font-size: 0.8rem;
  color: var(--gray-400);
  margin: 0;
  line-height: 1.55;
}

#toc-mobile {
  display: none;
}

.toc-toggle {
  width: 100%;
  background: #111;
  border: var(--border);
  border-left: 3px solid var(--blue);
  color: var(--white);
  font-family: var(--font-main);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 12px 16px;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.toc-body {
  display: none;
  background: #0e0e0e;
  border: var(--border);
  border-top: none;
  padding: 12px 0;
  margin-bottom: 24px;
}

.toc-body.open {
  display: block;
}

.toc-body a {
  display: block;
  padding: 6px 16px;
  font-size: 0.8rem;
  color: var(--gray-400);
}

.toc-body a:hover {
  color: var(--blue-light);
}

#progress-bar {
  position: fixed;
  top: var(--header-h);
  left: 0;
  height: 2px;
  background: var(--blue);
  z-index: 2000;
  width: 0%;
  transition: width 0.1s linear;
}

footer {
  border-top: var(--border);
  padding: 32px 48px;
  margin-left: var(--sidebar-w);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

footer .footer-left {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--gray-600);
  letter-spacing: 0.04em;
}

footer .footer-left span {
  color: var(--blue-light);
}

footer .footer-right {
  font-size: 0.75rem;
  color: var(--gray-600);
  letter-spacing: 0.04em;
}

footer .footer-right a {
  color: var(--gray-400);
}

footer .footer-right a:hover {
  color: var(--blue-light);
}

.token-keyword { color: #93c5fd; }
.token-type    { color: #86efac; }
.token-string  { color: #fde68a; }
.token-comment { color: #555; font-style: italic; }
.token-method  { color: #f9a8d4; }

@media (max-width: 1024px) {
  #content {
    padding: 40px 32px 80px;
  }
}

@media (max-width: 768px) {
  :root {
    --sidebar-w: 0px;
  }

  #sidebar {
    left: -260px;
    width: 260px;
    transition: left 0.2s ease;
    z-index: 950;
  }

  #sidebar.open {
    left: 0;
    box-shadow: 4px 0 20px rgba(0,0,0,0.5);
  }

  #sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 940;
  }

  #sidebar-overlay.visible {
    display: block;
  }

  #main {
    margin-left: 0;
  }

  footer {
    margin-left: 0;
    padding: 24px;
  }

  #hamburger {
    display: flex;
  }

  #top-bar nav {
    display: none;
  }

  #content {
    padding: 32px 20px 80px;
  }

  #toc-mobile {
    display: block;
  }

  .section-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  pre {
    font-size: 0.73rem;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .method-item {
    flex-direction: column;
    gap: 4px;
  }

  .method-item .method-name {
    min-width: auto;
  }

  thead th, td {
    padding: 8px 12px;
  }
}