@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=JetBrains+Mono:wght@400;500&family=Syne:wght@600;700;800&display=swap');

:root {
  --bg: #0b0f14;
  --bg-elev: #121820;
  --bg-sidebar: #0e131a;
  --line: rgba(148, 183, 210, 0.12);
  --text: #e8eef5;
  --muted: #8b9bb0;
  --accent: #5ec8ff;
  --accent-dim: rgba(94, 200, 255, 0.12);
  --accent-2: #7dffa8;
  --warn: #ffc857;
  --code-bg: #0a1018;
  --tip-bg: rgba(94, 200, 255, 0.08);
  --tip-border: rgba(94, 200, 255, 0.35);
  --radius: 10px;
  --sidebar-w: 280px;
  --font: 'DM Sans', system-ui, sans-serif;
  --display: 'Syne', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; min-height: 100%; }
body {
  font-family: var(--font);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(94, 200, 255, 0.14), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(125, 255, 168, 0.07), transparent 50%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  background: linear-gradient(180deg, var(--bg-sidebar), #0a0e14 90%);
  border-right: 1px solid var(--line);
  padding: 1.25rem 1rem 2rem;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.35rem 0.55rem 1.1rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 1rem;
}
.brand-name {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.55rem;
  letter-spacing: -0.03em;
  background: linear-gradient(120deg, #fff 20%, var(--accent) 80%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand-sub {
  color: var(--muted);
  font-size: 0.78rem;
}

.search {
  width: 100%;
  margin-bottom: 1rem;
  padding: 0.65rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--text);
  font: inherit;
  outline: none;
}
.search:focus { border-color: rgba(94, 200, 255, 0.45); box-shadow: 0 0 0 3px var(--accent-dim); }

.nav-section { margin-bottom: 1rem; }
.nav-title {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding: 0.35rem 0.55rem;
  font-weight: 600;
}
.nav-link {
  display: block;
  padding: 0.42rem 0.6rem;
  border-radius: 7px;
  color: var(--text);
  font-size: 0.9rem;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}
.nav-link:hover {
  background: var(--accent-dim);
  text-decoration: none;
  transform: translateX(2px);
}
.nav-link.active {
  background: var(--accent-dim);
  color: var(--accent);
  font-weight: 600;
}

.main {
  padding: 2rem 2.5rem 4rem;
  max-width: 920px;
}

.hero {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
  animation: rise 0.45s ease both;
}
.hero h1 {
  font-family: var(--display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin: 0 0 0.5rem;
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 58ch;
}

.page { animation: rise 0.35s ease both; }
.page h1 {
  font-family: var(--display);
  font-size: 2rem;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}
.page h2 {
  font-family: var(--display);
  font-size: 1.25rem;
  margin: 2rem 0 0.75rem;
  letter-spacing: -0.01em;
}
.page h3 {
  font-size: 1.02rem;
  margin: 1.5rem 0 0.5rem;
  color: var(--accent);
}
.page p { color: #c9d4e1; }
.page ul { padding-left: 1.2rem; color: #c9d4e1; }
.page li { margin: 0.35rem 0; }

.tip {
  margin: 1.25rem 0;
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  background: var(--tip-bg);
  border: 1px solid var(--tip-border);
}
.tip strong {
  display: block;
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}
.tip p { margin: 0; color: var(--text); font-size: 0.95rem; }

.warn {
  margin: 1.25rem 0;
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  background: rgba(255, 200, 87, 0.08);
  border: 1px solid rgba(255, 200, 87, 0.35);
}
.warn strong {
  display: block;
  color: var(--warn);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0 1.25rem;
}
.chip {
  font-size: 0.75rem;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
}

.syntax {
  margin: 1rem 0;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  background: var(--code-bg);
  border: 1px solid var(--line);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.86rem;
  color: #d7e7f7;
  line-height: 1.55;
}
.syntax .kw { color: #7dffa8; }
.syntax .tok { color: var(--accent); }
.syntax .str { color: #ffc857; }
.syntax .cm { color: #6b7c90; }

.explain {
  color: #c9d4e1;
  font-size: 1.02rem;
  max-width: 68ch;
  margin: 0.35rem 0 1rem;
}

.topbar-actions {
  display: flex;
  gap: 0.5rem;
  margin: 0 0 0.85rem;
  padding: 0 0.15rem;
}

.lang-btn {
  flex: 1;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(94,200,255,0.12), rgba(94,200,255,0.04));
  color: var(--text);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.lang-btn:hover {
  border-color: rgba(94, 200, 255, 0.5);
  transform: translateY(-1px);
}

html[dir="rtl"] .nav-link:hover { transform: translateX(-2px); }
html[dir="rtl"] .sidebar { border-right: none; border-left: 1px solid var(--line); }
html[dir="rtl"] .app { direction: rtl; }

.param {
  margin: 0.85rem 0;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--line);
}
.param code {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.88rem;
}
.param .type {
  color: var(--accent-2);
  font-family: var(--mono);
  font-size: 0.78rem;
  margin-left: 0.35rem;
}
.param p { margin: 0.35rem 0 0; font-size: 0.92rem; }

.fn-card {
  margin: 1.5rem 0;
  padding-top: 0.25rem;
  scroll-margin-top: 1.5rem;
}
.fn-card + .fn-card {
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}

.grid-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
  margin-top: 1.25rem;
}
.grid-links a {
  display: block;
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--line);
  color: var(--text);
  transition: border-color 0.15s ease, transform 0.15s ease, background 0.15s ease;
}
.grid-links a:hover {
  border-color: rgba(94, 200, 255, 0.4);
  background: var(--accent-dim);
  text-decoration: none;
  transform: translateY(-2px);
}
.grid-links strong { display: block; color: var(--accent); margin-bottom: 0.25rem; }
.grid-links span { color: var(--muted); font-size: 0.85rem; }

.footer-note {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.menu-btn {
  display: none;
  position: fixed;
  top: 0.85rem;
  left: 0.85rem;
  z-index: 40;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--text);
  border-radius: 8px;
  padding: 0.55rem 0.75rem;
  font: inherit;
  cursor: pointer;
}

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(86vw, var(--sidebar-w));
    z-index: 30;
    transform: translateX(-105%);
    transition: transform 0.25s ease;
    box-shadow: 20px 0 60px rgba(0,0,0,0.45);
  }
  .sidebar.open { transform: translateX(0); }
  .menu-btn { display: inline-flex; }
  .main { padding: 4.5rem 1.15rem 3rem; }
}