/* ===== CSS Variables ===== */
:root {
  --primary: #0f172a;
  --primary-light: #1e293b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #334155;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 25px rgba(0,0,0,0.12);
  --radius: 10px;
  --transition: all 0.2s ease;
  --nav-height: 70px;
  --container-max: 1200px;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 0.95rem;
}

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; height: auto; }

/* ===== Header ===== */
.header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--nav-height);
}

.header-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.logo-area img { height: 40px; }
.site-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
}
.site-title span { color: var(--accent); }

/* ===== Desktop Nav ===== */
.main-nav { display: flex; align-items: center; gap: 0.5rem; }
.nav-item {
  padding: 0.6rem 1rem;
  border-radius: 6px;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text);
  position: relative;
}
.nav-item:hover, .nav-item.active {
  background: rgba(59,130,246,0.1);
  color: var(--accent);
}

/* Dropdown */
.nav-item.parent { cursor: pointer; }
.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-hover);
  min-width: 200px;
  padding: 0.5rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: var(--transition);
  z-index: 100;
}
.nav-item.parent:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown a {
  display: block;
  padding: 0.5rem 1.25rem;
  font-size: 0.9rem;
  color: var(--text);
}
.dropdown a:hover {
  background: rgba(59,130,246,0.08);
  color: var(--accent);
  padding-left: 1.5rem;
}

/* ===== Mobile Menu Toggle ===== */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.3rem;
  color: var(--primary);
  cursor: pointer;
  padding: 0.5rem;
}

/* ===== Mobile Offcanvas Menu ===== */
.offcanvas {
  position: fixed;
  top: 0;
  left: -100%;
  width: 280px;
  height: 100vh;
  background: var(--primary);
  color: #f1f5f9;
  z-index: 2000;
  transition: left 0.3s ease;
  padding: 1.5rem;
  overflow-y: auto;
}
.offcanvas.open { left: 0; }
.offcanvas-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 1rem;
}
.offcanvas-close {
  background: none;
  border: none;
  color: #f1f5f9;
  font-size: 1.2rem;
  cursor: pointer;
}
.offcanvas-nav a {
  display: block;
  padding: 0.75rem 0;
  color: #cbd5e1;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  font-size: 0.95rem;
}
.offcanvas-nav a:hover { color: #fff; padding-left: 0.5rem; }
.offcanvas-sub {
  padding-left: 1rem;
  margin: 0.5rem 0;
  display: none;
}
.offcanvas-parent.active + .offcanvas-sub { display: block; }
.offcanvas-sub a {
  font-size: 0.9rem;
  padding: 0.4rem 0;
  border: none;
  color: #94a3b8;
}

/* ===== Page Header Bar ===== */
.page-header-bar {
  background: var(--primary);
  color: #f1f5f9;
  padding: 1.5rem 0;
  margin-bottom: 2rem;
}
.page-header-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.page-header-bar h1 {
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ===== Content Container ===== */
.content-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

/* ===== Quick Start Banner ===== */
.quickstart-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #f1f5f9;
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  align-items: center;
}
.quickstart-banner h3 {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 1.05rem; margin-bottom: 0.5rem;
}
.qs-step { font-size: 0.9rem; opacity: 0.95; margin: 0.25rem 0; }
.qs-step code {
  background: rgba(255,255,255,0.15);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-family: 'Fira Code', monospace;
  font-size: 0.85rem;
}

/* ===== Card Grid ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1.5rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent);
}
.card i {
  font-size: 1.4rem;
  color: var(--accent);
}
.card h3 {
  font-size: 1.05rem;
  color: var(--primary);
  font-weight: 600;
}
.card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ===== Section Cards (Tables, Reference) ===== */
.section-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1.5rem;
  border: 1px solid var(--border);
  margin-bottom: 1.5rem;
}
.section-card h2 {
  font-size: 1.15rem;
  color: var(--primary);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ===== Tables ===== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 0.5rem 0;
}
.data-table th, .data-table td {
  padding: 0.7rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.data-table th {
  background: #f8fafc;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.85rem;
  width: 40%;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table code {
  background: #f1f5f9;
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  font-family: 'Fira Code', monospace;
  font-size: 0.85em;
  color: #dc2626;
}

/* ===== Callouts ===== */
.callout {
  padding: 0.85rem 1rem;
  border-radius: 0 8px 8px 0;
  border-left: 3px solid;
  font-size: 0.9rem;
  margin: 1rem 0;
}
.callout.tip { background: #f0fdf4; border-color: #22c55e; color: #166534; }
.callout.warn { background: #fff1f2; border-color: #ef4444; color: #991b1b; }
.callout.info { background: #eff6ff; border-color: var(--accent); color: #1e40af; }

/* ===== Support Grid ===== */
.support-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}
.support-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.support-item i {
  color: var(--accent);
  font-size: 1.1rem;
  margin-top: 3px;
}

/* ===== Footer ===== */
.footer-bar {
  background: var(--primary);
  color: #cbd5e1;
  padding: 2rem 0 1.5rem;
  margin-top: 3rem;
}
.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}
.footer-card h3 {
  color: #f1f5f9;
  font-size: 1rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-card ul { list-style: none; }
.footer-card li { margin: 0.4rem 0; }
.footer-card a { color: #94a3b8; }
.footer-card a:hover { color: #fff; }
.footer-bottom {
  text-align: center;
  padding-top: 1.5rem;
  margin-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.85rem;
  color: #64748b;
}

/* ===== Dividers ===== */
.divider { height: 1px; background: var(--border); margin: 2rem 0; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .main-nav { display: none; }
  .menu-toggle { display: block; }
  .header-container { padding: 0 1rem; }
  .content-container, .page-header-container, .footer-container {
    padding: 0 1rem;
  }
  .quickstart-banner { grid-template-columns: 1fr; text-align: center; }
  .data-table th { width: 45%; }
}

@media (max-width: 480px) {
  .card-grid { grid-template-columns: 1fr; }
  .support-grid { grid-template-columns: 1fr; }
  .footer-container { grid-template-columns: 1fr; text-align: center; }
  .support-item { justify-content: center; }
}