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

:root {
  --primary:      #6366f1;
  --primary-dark: #4f46e5;
  --primary-pale: #f0efff;
  --primary-rgb:  99,102,241;
  --violet:       #8b5cf6;
  --navy:         #0f172a;
  --navy-mid:     #1e293b;
  --slate:        #64748b;
  --border:       #e2e8f0;
  --bg:           #f8f7ff;
  --white:        #ffffff;
  --radius:       8px;
  --font:         -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, sans-serif;
  --font-mono:    'SF Mono', 'Fira Code', Consolas, monospace;

  --sidebar-w:    260px;
  --toc-w:        220px;
  --topbar-h:     52px;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--navy);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ─────────────────────────────────────────────────── */
#docs-topbar {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  background: var(--white);
  border-bottom: 1px solid var(--border);
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  z-index: 200;
}

#docs-layout {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ────────────────────────────────────────────────── */
#docs-sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  padding-bottom: 32px;
}

#sidebar-head {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border);
}

#sidebar-brand {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  margin-bottom: 8px;
}

.brand-iw {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, #6366f1, #a855f7, #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.brand-iw-fire {
  font-size: 16px;
  -webkit-text-fill-color: initial;
  background: none;
  color: #f97316;
}
.brand-docs {
  font-size: 12px;
  font-weight: 600;
  color: var(--slate);
  padding: 2px 7px;
  background: rgba(99,102,241,0.1);
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: 6px;
  letter-spacing: 0.02em;
}

#sidebar-back-link {
  font-size: 12px;
  color: var(--slate);
  text-decoration: none;
  display: block;
  transition: color 0.15s;
}
#sidebar-back-link:hover { color: var(--primary); }

#sidebar-lang {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
#sidebar-lang label { font-size: 12px; color: var(--slate); white-space: nowrap; }
#docs-lang-select {
  flex: 1;
  font-size: 12px;
  border: 1.5px solid rgba(99,102,241,0.2);
  border-radius: 20px;
  padding: 5px 10px;
  background: var(--white);
  color: var(--navy);
  cursor: pointer;
  transition: border-color 0.15s;
  font-family: var(--font);
}
#docs-lang-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb),0.12);
}

#docs-nav {
  padding: 12px 0;
  flex: 1;
}

/* Nav groups */
.nav-group-label {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--slate);
  padding: 12px 20px 4px;
}

.nav-item {
  display: block;
  font-size: 13.5px;
  color: var(--navy-mid);
  text-decoration: none;
  padding: 6px 20px;
  transition: background 0.1s, color 0.1s;
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  border-left: 2px solid transparent;
}
.nav-item:hover  { background: rgba(99,102,241,0.06); color: var(--navy); border-left-color: rgba(99,102,241,0.2); }
.nav-item.active { background: var(--primary-pale); color: var(--primary); font-weight: 600; border-left-color: var(--primary); }

.nav-children { padding-left: 12px; }
.nav-children .nav-item { font-size: 13px; padding: 5px 20px 5px 8px; }

/* Overlay */
#sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  backdrop-filter: blur(2px);
  z-index: 150;
}

/* ── Main content ───────────────────────────────────────────── */
#docs-main {
  flex: 1;
  min-width: 0;
  display: flex;
  gap: 0;
}

#docs-article {
  flex: 1;
  min-width: 0;
  max-width: 760px;
  padding: 48px 44px 96px;
}

#docs-loading {
  color: var(--slate);
  font-size: 14px;
}

/* ── On-page TOC ────────────────────────────────────────────── */
#docs-toc {
  width: var(--toc-w);
  flex-shrink: 0;
  padding: 48px 0 48px 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.toc-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--slate);
  padding: 0 16px 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}
#toc-list { list-style: none; padding: 0; }
#toc-list li a {
  display: block;
  font-size: 12.5px;
  color: var(--slate);
  text-decoration: none;
  padding: 4px 16px;
  border-left: 2px solid transparent;
  transition: color 0.1s, border-color 0.1s;
}
#toc-list li a:hover   { color: var(--navy); }
#toc-list li a.active  { color: var(--primary); border-left-color: var(--primary); }
#toc-list li.toc-h3 a  { padding-left: 28px; font-size: 12px; }
#docs-toc:empty, #docs-toc:not(:has(#toc-list li)) { display: none; }

/* ── Markdown typography ────────────────────────────────────── */
#docs-article h1 {
  font-size: 30px;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: -0.025em;
  margin-bottom: 12px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}
#docs-article h2 {
  font-size: 21px;
  font-weight: 700;
  color: var(--navy);
  margin-top: 44px;
  margin-bottom: 12px;
  padding-top: 8px;
  letter-spacing: -0.015em;
}
#docs-article h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--navy);
  margin-top: 30px;
  margin-bottom: 8px;
}
#docs-article h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--navy-mid);
  margin-top: 22px;
  margin-bottom: 6px;
}

#docs-article p  { margin-bottom: 16px; font-size: 15px; line-height: 1.75; color: var(--navy-mid); }
#docs-article li { font-size: 15px; line-height: 1.75; color: var(--navy-mid); }
#docs-article ul, #docs-article ol { margin: 0 0 16px 24px; }
#docs-article li + li { margin-top: 4px; }

#docs-article a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; transition: color 0.15s; }
#docs-article a:hover { color: var(--primary-dark); }

#docs-article strong { font-weight: 600; color: var(--navy); }
#docs-article em     { font-style: italic; }

/* Inline code */
#docs-article code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: rgba(99,102,241,0.07);
  border: 1px solid rgba(99,102,241,0.15);
  border-radius: 5px;
  padding: 2px 6px;
  color: #5b21b6;
}

/* Code blocks */
#docs-article pre {
  background: #0f0a1e;
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: var(--radius);
  padding: 18px 22px;
  overflow-x: auto;
  margin-bottom: 20px;
  box-shadow: 0 4px 16px rgba(99,102,241,0.08);
}
#docs-article pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 13.5px;
  color: #e2e8f0;
  border-radius: 0;
}

/* Blockquotes */
#docs-article blockquote {
  border-left: 3px solid var(--primary);
  background: var(--primary-pale);
  padding: 12px 16px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 16px;
}
#docs-article blockquote p { margin-bottom: 0; color: var(--navy-mid); font-size: 14px; }

/* Tables */
#docs-article table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
  font-size: 14px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}
#docs-article th {
  background: var(--bg);
  font-weight: 700;
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1.5px solid rgba(99,102,241,0.15);
  color: var(--navy);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
#docs-article td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--navy-mid);
  vertical-align: top;
}
#docs-article tr:last-child td { border-bottom: none; }
#docs-article tr:hover td { background: rgba(99,102,241,0.03); }

/* Horizontal rule */
#docs-article hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 36px 0;
}

/* Images */
#docs-article img {
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin: 8px 0 16px;
}

/* Not-found / error state */
.docs-not-found { text-align: center; padding: 80px 0; color: var(--slate); }
.docs-not-found h2 { font-size: 20px; margin-bottom: 8px; color: var(--navy); }
.docs-not-found p  { font-size: 14px; }

/* Lang fallback banner */
.lang-fallback-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #fffbeb;
  border: 1px solid #fcd34d;
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 13px;
  color: #92400e;
  margin-bottom: 24px;
}

/* ── Mobile topbar elements ─────────────────────────────────── */
#sidebar-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
#sidebar-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}
#topbar-brand {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  flex: 1;
}
#topbar-back { font-size: 12px; color: var(--slate); text-decoration: none; transition: color 0.15s; }
#topbar-back:hover { color: var(--primary); }

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

@media (max-width: 768px) {
  #docs-topbar { display: flex; }
  #docs-layout { padding-top: var(--topbar-h); }

  #docs-sidebar {
    position: fixed;
    top: 0; left: 0;
    height: 100%;
    z-index: 160;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    width: min(var(--sidebar-w), 85vw);
  }
  #docs-sidebar.open { transform: translateX(0); }
  #sidebar-overlay.open { display: block; }

  #docs-article { padding: 24px 20px 60px; max-width: 100%; }
}