/* Variables & Themes */
:root {
  --font-title: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', Courier, monospace;

  /* Premium Dark Palette */
  --bg-primary: #0b0f19;
  --bg-secondary: #131b2e;
  --bg-card: #1c2742;
  --border-color: rgba(255, 255, 255, 0.08);
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --primary: #6366f1;
  --primary-glow: rgba(99, 102, 241, 0.15);
  --accent: #a855f7;
  --accent-glow: rgba(168, 85, 247, 0.15);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.1);
  --code-bg: #090c15;
}

.light-theme {
  /* Premium Light Palette */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #f1f5f9;
  --border-color: rgba(0, 0, 0, 0.06);
  --text-main: #0f172a;
  --text-muted: #64748b;
  --primary: #4f46e5;
  --primary-glow: rgba(79, 70, 229, 0.08);
  --accent: #8b5cf6;
  --accent-glow: rgba(139, 92, 246, 0.08);
  --success: #059669;
  --success-glow: rgba(5, 150, 105, 0.08);
  --code-bg: #0f172a;
}

/* Global Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  transition: background-color 0.3s ease, border-color 0.3s ease, color 0.2s ease;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Header Styling */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  background-color: rgba(19, 27, 46, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 30px;
  z-index: 100;
}

.light-theme .top-nav {
  background-color: rgba(255, 255, 255, 0.85);
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  font-size: 24px;
}

.logo-text {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 20px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-badge {
  background: var(--primary-glow);
  color: var(--primary);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 20px;
  font-weight: 600;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.search-container input {
  width: 320px;
  padding: 10px 16px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  color: var(--text-main);
  font-size: 14px;
  outline: none;
}

.search-container input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

#theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 20px;
  color: var(--text-main);
}

.github-link {
  color: var(--text-main);
  opacity: 0.8;
}

.github-link:hover {
  opacity: 1;
}

/* Sidebar Styling */
.container {
  display: flex;
  margin-top: 70px;
  min-height: calc(100vh - 70px);
}

.sidebar {
  width: 280px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  position: fixed;
  top: 70px;
  bottom: 0;
  left: 0;
  overflow-y: auto;
  padding: 30px 20px;
  z-index: 90;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.nav-section h3 {
  font-family: var(--font-title);
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.nav-section ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav-item {
  display: block;
  padding: 8px 12px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  border-radius: 8px;
}

.nav-item:hover {
  color: var(--text-main);
  background-color: var(--border-color);
}

.nav-item.active {
  color: var(--text-main);
  background-color: var(--primary-glow);
  font-weight: 500;
  border-left: 3px solid var(--primary);
}

/* Content Area */
.content-area {
  margin-left: 280px;
  flex: 1;
  padding: 50px 80px;
  max-width: 1000px;
  overflow-y: auto;
}

.doc-section {
  display: none;
}

.doc-section.active-section {
  display: block;
  animation: fadeIn 0.4s ease-out;
}

/* Headings */
h1 {
  font-family: var(--font-title);
  font-size: 40px;
  font-weight: 800;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text-main), var(--text-muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-family: var(--font-title);
  font-size: 26px;
  font-weight: 700;
  margin-top: 40px;
  margin-bottom: 15px;
}

h3 {
  font-family: var(--font-title);
  font-size: 18px;
  font-weight: 600;
  margin-top: 25px;
  margin-bottom: 10px;
}

p {
  color: var(--text-muted);
  margin-bottom: 20px;
  font-size: 16px;
}

p.lead {
  font-size: 18px;
  color: var(--text-main);
}

/* Code Blocks */
pre {
  background-color: var(--code-bg);
  border-radius: 12px;
  padding: 20px;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  margin-bottom: 25px;
}

code {
  font-family: var(--font-mono);
  font-size: 14px;
  color: #a5b4fc;
}

/* Alerts */
.alert {
  padding: 16px 20px;
  border-radius: 12px;
  margin: 25px 0;
  border-left: 4px solid var(--primary);
  background-color: var(--primary-glow);
}

.alert.tip {
  border-left-color: var(--accent);
  background-color: var(--accent-glow);
}

.alert.note {
  border-left-color: var(--success);
  background-color: var(--success-glow);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.feature-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
}

.feature-card h4 {
  font-family: var(--font-title);
  font-size: 16px;
  margin-bottom: 10px;
  color: var(--text-main);
}

.feature-card p {
  font-size: 13px;
  margin-bottom: 0;
}

/* Tables */
.api-table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
}

.api-table th, .api-table td {
  border-bottom: 1px solid var(--border-color);
  padding: 12px 16px;
  text-align: left;
  font-size: 14px;
}

.api-table th {
  font-family: var(--font-title);
  color: var(--text-main);
  background-color: var(--bg-secondary);
  font-weight: 600;
}

.api-table td code {
  color: var(--accent);
}

/* Diagrams */
.architecture-diagram pre {
  background-color: var(--bg-secondary);
  color: var(--text-main);
  border-color: var(--border-color);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.3;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive design */
@media(max-width: 900px) {
  .sidebar { width: 0; display: none; }
  .content-area { margin-left: 0; padding: 30px; }
  .search-container { display: none; }
}