/* ═══════════════════════════════════════════════════════════════════════════ */
/* Vrata Documentation — Custom Theme                                        */
/* Palette: #0b2545 (dark), #13678a (mid), #45b7d1 (accent), #bee9e8 (teal) */
/* ═══════════════════════════════════════════════════════════════════════════ */

:root {
  --color-dark: #0b2545;
  --color-mid: #13678a;
  --color-accent: #45b7d1;
  --color-teal: #bee9e8;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafb;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-code-bg: #0d1b2a;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --sidebar-width: 280px;
  --content-max: 860px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
}

a { color: var(--color-mid); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-accent); }

/* ─── Header / Navbar ──────────────────────────────────────────────────── */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-dark);
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px solid var(--color-mid);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.navbar-brand img { height: 32px; }

.navbar-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.navbar-links a {
  color: var(--color-teal);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.navbar-links a:hover { color: #fff; }
.navbar-links a.active { color: #fff; border-bottom: 2px solid var(--color-accent); padding-bottom: 2px; }

/* ─── Layout: Sidebar + Content ────────────────────────────────────────── */

.docs-layout {
  display: flex;
  min-height: calc(100vh - 60px);
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--color-bg-alt);
  border-right: 1px solid var(--color-border);
  padding: 1.5rem 1rem;
  position: sticky;
  top: 60px;
  height: calc(100vh - 60px);
  overflow-y: auto;
  flex-shrink: 0;
}

.sidebar h3 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-text-muted);
  margin: 1.5rem 0 0.5rem 0;
}

.sidebar h3:first-child { margin-top: 0; }

.sidebar ul { list-style: none; }

.sidebar li a {
  display: block;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-size: 0.88rem;
  color: var(--color-text);
  transition: all 0.15s;
}

.sidebar li a:hover { background: var(--color-border); color: var(--color-mid); }
.sidebar li a.active { background: var(--color-mid); color: #fff; }

/* ─── Collapsible sidebar tree ─────────────────────────────────────────── */

.sidebar-section { margin-bottom: 0.25rem; }

.sidebar-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.15s;
  text-decoration: none;
}

.sidebar-heading a {
  color: inherit;
  text-decoration: none;
  flex: 1;
}

.sidebar-heading:hover { background: var(--color-border); color: var(--color-mid); }
.sidebar-heading.active { color: var(--color-mid); }
.sidebar-heading.active a { color: var(--color-mid); }

.sidebar-arrow {
  font-size: 0.75rem;
  transition: transform 0.2s;
  color: var(--color-text-muted);
}

.sidebar-section.open > .sidebar-heading .sidebar-arrow { transform: rotate(90deg); }

.sidebar-children {
  display: none;
  padding-left: 0.5rem;
  margin-top: 0.15rem;
}

.sidebar-section.open > .sidebar-children { display: block; }

.sidebar-children > li > a {
  display: block;
  padding: 0.3rem 0.75rem;
  border-radius: 6px;
  font-size: 0.86rem;
  color: var(--color-text);
  transition: all 0.15s;
}

.sidebar-children > li > a:hover { background: var(--color-border); color: var(--color-mid); }
.sidebar-children > li > a.active { background: var(--color-mid); color: #fff; }

/* Sub-subsection (e.g. Destinations > Endpoint Balancing) */

.sidebar-subsection { margin-bottom: 0.1rem; }

.sidebar-subheading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.3rem 0.75rem;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.15s;
  text-decoration: none;
}

.sidebar-subheading a {
  color: inherit;
  text-decoration: none;
  flex: 1;
}

.sidebar-subheading:hover { background: var(--color-border); color: var(--color-mid); }
.sidebar-subheading:hover a { color: inherit; }
.sidebar-subheading.active { background: var(--color-mid); color: #fff; }
.sidebar-subheading.active a { color: #fff; }

.sidebar-subsection .sidebar-arrow { font-size: 0.65rem; }
.sidebar-subsection.open > .sidebar-subheading .sidebar-arrow { transform: rotate(90deg); }

.sidebar-grandchildren {
  display: none;
  padding-left: 0.75rem;
  margin-top: 0.1rem;
}

.sidebar-subsection.open > .sidebar-grandchildren { display: block; }

.sidebar-grandchildren li a {
  display: block;
  padding: 0.25rem 0.75rem;
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  transition: all 0.15s;
}

.sidebar-grandchildren li a:hover { background: var(--color-border); color: var(--color-mid); }
.sidebar-grandchildren li a.active { background: var(--color-mid); color: #fff; }

.content {
  flex: 1;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 2.5rem 3rem;
}

/* ─── Typography ───────────────────────────────────────────────────────── */

.content h1 { font-size: 2.2rem; font-weight: 800; color: var(--color-dark); margin-bottom: 1rem; line-height: 1.2; }
.content h2 { font-size: 1.6rem; font-weight: 700; color: var(--color-dark); margin: 2.5rem 0 0.75rem; padding-bottom: 0.3rem; border-bottom: 2px solid var(--color-teal); }
.content h3 { font-size: 1.25rem; font-weight: 600; color: var(--color-mid); margin: 2rem 0 0.5rem; }
.content h4 { font-size: 1.05rem; font-weight: 600; color: var(--color-text); margin: 1.5rem 0 0.5rem; }

.content p { margin-bottom: 1rem; }
.content ul, .content ol { margin: 0 0 1rem 1.5rem; }
.content li { margin-bottom: 0.3rem; }

.content blockquote {
  border-left: 4px solid var(--color-accent);
  background: var(--color-bg-alt);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 8px 8px 0;
  color: var(--color-text-muted);
}

/* ─── Code blocks ──────────────────────────────────────────────────────── */

.content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-bg-alt);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--color-border);
}

.content pre {
  background: var(--color-code-bg);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid #1b3a5c;
}

.content pre code {
  background: none;
  border: none;
  padding: 0;
  color: #e2e8f0;
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ─── Tables ───────────────────────────────────────────────────────────── */

.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.content th {
  background: var(--color-dark);
  color: #fff;
  padding: 0.6rem 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.85rem;
}

.content td {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--color-border);
}

.content tr:nth-child(even) { background: var(--color-bg-alt); }

/* ─── Landing page ─────────────────────────────────────────────────────── */

.hero {
  background: var(--color-dark);
  color: #fff;
  text-align: center;
  padding: 5rem 2rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 600px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(69,183,209,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero img { height: 120px; margin-bottom: 1.5rem; filter: drop-shadow(0 4px 20px rgba(69,183,209,0.3)); }
.hero h1 { font-size: 3.5rem; font-weight: 800; letter-spacing: 2px; margin-bottom: 0.5rem; }
.hero .tagline { font-size: 1.15rem; color: var(--color-teal); font-weight: 300; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 2rem; }

.hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.hero-cta a {
  padding: 0.75rem 2rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
}
.btn-primary { background: var(--color-accent); color: var(--color-dark); }
.btn-primary:hover { background: #5cc8e0; color: var(--color-dark); transform: translateY(-2px); box-shadow: 0 4px 15px rgba(69,183,209,0.4); }
.btn-secondary { background: transparent; color: var(--color-teal); border: 2px solid var(--color-teal); }
.btn-secondary:hover { background: var(--color-teal); color: var(--color-dark); transform: translateY(-2px); }

/* ─── Feature grid ─────────────────────────────────────────────────────── */

.features {
  padding: 4rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.features h2 { text-align: center; font-size: 2rem; color: var(--color-dark); margin-bottom: 0.5rem; }
.features .subtitle { text-align: center; color: var(--color-text-muted); margin-bottom: 3rem; font-size: 1.05rem; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.75rem;
  transition: all 0.25s;
}

.feature-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 8px 25px rgba(69,183,209,0.12);
  transform: translateY(-4px);
}

.feature-card h3 { color: var(--color-mid); font-size: 1.1rem; margin-bottom: 0.5rem; }
.feature-card p { color: var(--color-text-muted); font-size: 0.92rem; line-height: 1.6; }

/* ─── Comparison section ───────────────────────────────────────────────── */

.comparison {
  background: var(--color-bg-alt);
  padding: 4rem 2rem;
}

.comparison-inner {
  max-width: 900px;
  margin: 0 auto;
}

.comparison h2 { text-align: center; font-size: 2rem; color: var(--color-dark); margin-bottom: 2rem; }

/* ─── Architecture section ─────────────────────────────────────────────── */

.architecture {
  padding: 4rem 2rem;
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.architecture h2 { font-size: 2rem; color: var(--color-dark); margin-bottom: 1rem; }
.architecture p { color: var(--color-text-muted); margin-bottom: 2rem; }

/* ─── Footer ───────────────────────────────────────────────────────────── */

.footer {
  background: var(--color-dark);
  color: var(--color-teal);
  text-align: center;
  padding: 2rem;
  font-size: 0.85rem;
  border-top: 2px solid var(--color-mid);
}

.footer a { color: var(--color-accent); }
.footer a:hover { color: #fff; }

/* ─── Scroll animations ───────────────────────────────────────────────── */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Responsive ───────────────────────────────────────────────────────── */

@media (max-width: 900px) {
  .sidebar { display: none; }
  .content { padding: 1.5rem; }
  .hero h1 { font-size: 2.5rem; }
  .feature-grid { grid-template-columns: 1fr; }
}