/* ===========================
   CSS Reset & Base
   =========================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #a5b4fc;
  --bg: #ffffff;
  --bg-subtle: #f8fafc;
  --bg-muted: #f1f5f9;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --sidebar-width: 260px;
  --topbar-height: 52px;
  --code-bg: #1e1e2e;
  --code-text: #cdd6f4;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06);
}

html { font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  min-height: 100vh;
}

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

.hidden { display: none !important; }

/* ===========================
   Landing Page
   =========================== */
.landing { min-height: 100vh; display: flex; flex-direction: column; }

.landing-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 64px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.landing-brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}

.brand-icon { width: 32px; height: 32px; }
.brand-icon-sm { width: 28px; height: 28px; }

.landing-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: .95rem;
}

.landing-nav a { color: var(--text-muted); font-weight: 500; }
.landing-nav a:hover { color: var(--text); text-decoration: none; }

.btn-outline {
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: .35rem .85rem;
  color: var(--text) !important;
  transition: border-color .15s, background .15s;
}

.btn-outline:hover { border-color: var(--primary); background: var(--bg-subtle); }

/* Hero */
.landing-main { flex: 1; }

.hero {
  text-align: center;
  padding: 5rem 1.5rem 3.5rem;
  max-width: 680px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  background: #ede9fe;
  color: var(--primary-dark);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: .3rem .75rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.02em;
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 2.25rem;
  line-height: 1.7;
}

.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

.btn-primary {
  background: var(--primary);
  color: #fff !important;
  font-weight: 600;
  padding: .65rem 1.5rem;
  border-radius: var(--radius);
  transition: background .15s;
  text-decoration: none !important;
}

.btn-primary:hover { background: var(--primary-dark); }

.btn-secondary {
  display: flex;
  align-items: center;
  gap: .4rem;
  color: var(--text) !important;
  background: var(--bg-subtle);
  border: 1.5px solid var(--border);
  font-weight: 600;
  padding: .65rem 1.5rem;
  border-radius: var(--radius);
  transition: border-color .15s;
  text-decoration: none !important;
}

.btn-secondary:hover { border-color: var(--primary); }

/* Feature Cards */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  max-width: 980px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 5rem;
}

.feature-card {
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  cursor: pointer;
  transition: border-color .15s, box-shadow .15s, transform .15s;
}

.feature-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon { font-size: 1.75rem; margin-bottom: .75rem; }
.feature-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: .4rem; }
.feature-card p { font-size: .9rem; color: var(--text-muted); line-height: 1.5; }

/* ===========================
   Docs Portal
   =========================== */
.docs-portal { display: flex; height: 100vh; overflow: hidden; }

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-subtle);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform .25s ease;
  z-index: 100;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  height: var(--topbar-height);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-weight: 700;
  font-size: .9rem;
  color: var(--text);
  text-decoration: none;
}

.sidebar-brand:hover { text-decoration: none; }

.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1rem;
  padding: .25rem;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: .75rem 0 1rem;
}

.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.nav-section { margin-bottom: .25rem; }

.nav-section-title {
  display: block;
  padding: .35rem 1rem .2rem;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-light);
  user-select: none;
}

.nav-link {
  display: block;
  padding: .4rem 1rem .4rem 1.25rem;
  font-size: .875rem;
  color: var(--text-muted);
  border-radius: 0;
  transition: background .12s, color .12s;
  cursor: pointer;
  text-decoration: none;
  border-left: 2px solid transparent;
}

.nav-link:hover { background: var(--bg-muted); color: var(--text); text-decoration: none; }
.nav-link.active {
  color: var(--primary);
  border-left-color: var(--primary);
  background: #ede9fe55;
  font-weight: 600;
}

.nav-group { margin-bottom: .1rem; }

.nav-group-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .4rem 1rem .4rem 1.25rem;
  font-size: .875rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  transition: background .12s;
  border-radius: 0;
}

.nav-group-title:hover { background: var(--bg-muted); color: var(--text); }

.nav-group-title .chevron {
  transition: transform .2s;
  font-size: .65rem;
  color: var(--text-light);
}

.nav-group.open .chevron { transform: rotate(90deg); }

.nav-group-items { display: none; }
.nav-group.open .nav-group-items { display: block; }

.nav-group-items .nav-link { padding-left: 2rem; }

/* Docs Main */
.docs-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

.docs-topbar {
  height: var(--topbar-height);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  flex-shrink: 0;
}

.menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: .25rem;
}

.menu-btn:hover { color: var(--text); }

.topbar-actions { display: flex; gap: 1rem; align-items: center; }

.topbar-link {
  display: flex;
  align-items: center;
  gap: .35rem;
  font-size: .85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.topbar-link:hover { color: var(--primary); text-decoration: none; }

.content-area {
  flex: 1;
  overflow-y: auto;
  padding: 2.5rem 3rem;
}

.content-area::-webkit-scrollbar { width: 6px; }
.content-area::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ===========================
   Markdown Body
   =========================== */
.markdown-body { max-width: 760px; }

.markdown-body h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -.025em;
  margin-bottom: .75rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--border);
}

.markdown-body h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: .75rem;
  padding-bottom: .35rem;
  border-bottom: 1px solid var(--border);
}

.markdown-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-top: 1.75rem;
  margin-bottom: .5rem;
}

.markdown-body p { margin-bottom: 1rem; color: var(--text); }

.markdown-body ul, .markdown-body ol {
  margin: .75rem 0 1rem 1.5rem;
}

.markdown-body li { margin-bottom: .25rem; }

.markdown-body a { color: var(--primary); }

/* Code */
.markdown-body code {
  background: var(--bg-muted);
  color: #7c3aed;
  padding: .15em .4em;
  border-radius: 4px;
  font-size: .875em;
  font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
}

.markdown-body pre {
  background: var(--code-bg);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1rem 0 1.5rem;
  box-shadow: var(--shadow);
}

.markdown-body pre code {
  background: none;
  color: var(--code-text);
  padding: 0;
  font-size: .875rem;
  line-height: 1.7;
}

/* Tables */
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: .9rem;
}

.markdown-body th {
  background: var(--bg-subtle);
  font-weight: 700;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-muted);
  padding: .6rem 1rem;
  text-align: left;
  border: 1px solid var(--border);
}

.markdown-body td {
  padding: .6rem 1rem;
  border: 1px solid var(--border);
  color: var(--text);
}

.markdown-body tr:hover td { background: var(--bg-subtle); }

.markdown-body td code {
  background: var(--bg-muted);
  color: #7c3aed;
}

/* Blockquote */
.markdown-body blockquote {
  border-left: 3px solid var(--primary);
  padding: .75rem 1rem;
  background: #ede9fe22;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1rem 0;
  color: var(--text-muted);
}

/* Mermaid */
.mermaid {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  margin: 1rem 0 1.5rem;
  overflow-x: auto;
}

/* Constants Cards */
.constants-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: .75rem;
  margin: 1rem 0 1.5rem;
}

.const-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .75rem 1rem;
  font-size: .875rem;
}

.const-card-name {
  font-weight: 700;
  color: var(--primary);
  font-family: 'Fira Code', 'Cascadia Code', monospace;
  font-size: .8rem;
}

.const-card-desc { color: var(--text-muted); font-size: .8rem; margin-top: .2rem; }

/* Loading & Error */
#content.loading::after {
  content: 'Loading…';
  display: block;
  color: var(--text-muted);
  padding: 2rem 0;
}

.load-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  color: #dc2626;
  font-size: .9rem;
}

/* Overlay for mobile */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 50;
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
  }

  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow-md); }
  .sidebar-toggle { display: block; }
  .menu-btn { display: block; }
  .sidebar-overlay.visible { display: block; }

  .content-area { padding: 1.5rem 1.25rem; }

  .markdown-body h1 { font-size: 1.6rem; }
  .markdown-body h2 { font-size: 1.15rem; }

  .features { grid-template-columns: 1fr; padding: 1rem 1rem 3rem; }
  .hero { padding: 3rem 1rem 2rem; }
}