/* ==============================================================================
   THẾ GIỚI KEYCAP — UNIFIED HTML DOCUMENTATION STYLESHEET
   Dual-Purpose Design: Optimized for Human Readers & AI Agent Parsing
   ============================================================================== */

:root {
  --bg-primary: #121316;
  --bg-secondary: #1a1c23;
  --bg-surface: #1e212b;
  --bg-hover: #292d3a;
  --border-color: #2e3342;
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  /* Brand Coral Theme */
  --accent-color: #ed5d47;
  --accent-hover: #d94b36;
  --accent-soft: rgba(237, 93, 71, 0.12);
  
  --cyan-color: #38bdf8;
  --cyan-soft: rgba(56, 189, 248, 0.12);
  --success-color: #10b981;
  --success-soft: rgba(16, 185, 129, 0.12);
  --warning-color: #f59e0b;
  --warning-soft: rgba(245, 158, 11, 0.12);
  --danger-color: #ef4444;
  --danger-soft: rgba(239, 68, 68, 0.12);
  --code-bg: #090a0d;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sidebar-width: 300px;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-hover: #f1f5f9;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent-color: #ed5d47;
  --accent-hover: #d94b36;
  --accent-soft: rgba(237, 93, 71, 0.08);
  --cyan-color: #0284c7;
  --cyan-soft: rgba(2, 132, 199, 0.08);
  --code-bg: #f1f5f9;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 15px;
}

/* HEADER */
.doc-header {
  height: 60px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.doc-logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.doc-logo-area a {
  font-size: 1.05rem;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.doc-badge {
  font-size: 0.75rem;
  padding: 0.15rem 0.55rem;
  border-radius: 9999px;
  background-color: var(--accent-soft);
  color: var(--accent-color);
  font-weight: 700;
  border: 1px solid rgba(237, 93, 71, 0.3);
}

.doc-nav-links {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.doc-nav-links a {
  padding: 0.4rem 0.75rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.15s ease;
  font-weight: 500;
}

.doc-nav-links a:hover,
.doc-nav-links a.active {
  color: #fff;
  background-color: var(--bg-hover);
}

.doc-nav-links a.active {
  color: var(--accent-color);
  font-weight: 700;
}

.btn-icon {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.15s ease;
  margin-left: 0.5rem;
}

.btn-icon:hover {
  background-color: var(--bg-hover);
  border-color: var(--accent-color);
}

/* LAYOUT */
.doc-layout {
  display: flex;
  max-width: 1600px;
  margin: 0 auto;
}

.doc-sidebar {
  width: var(--sidebar-width);
  height: calc(100vh - 60px);
  position: sticky;
  top: 60px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 1.25rem;
  flex-shrink: 0;
}

.sidebar-search {
  margin-bottom: 1.25rem;
}

.sidebar-search input {
  width: 100%;
  padding: 0.55rem 0.85rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.15s;
}

.sidebar-search input:focus {
  border-color: var(--accent-color);
}

.sidebar-group {
  margin-bottom: 1.5rem;
}

.sidebar-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 0.5rem;
  padding-left: 0.5rem;
}

.sidebar-nav-list {
  list-style: none;
}

.sidebar-nav-item a {
  display: block;
  padding: 0.35rem 0.65rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 5px;
  line-height: 1.35;
  transition: all 0.15s ease;
}

.sidebar-nav-item a:hover {
  color: var(--text-primary);
  background-color: var(--bg-hover);
}

.sidebar-nav-item a.active {
  color: var(--accent-color);
  background-color: var(--accent-soft);
  font-weight: 600;
}

.sidebar-nav-item.level-3 a {
  padding-left: 1.4rem;
  font-size: 0.82rem;
}

/* MAIN CONTENT */
.doc-main {
  flex: 1;
  min-width: 0;
  padding: 2.5rem 3.5rem 4rem;
  max-width: 980px;
}

article h1 {
  font-size: 2.2rem;
  line-height: 1.25;
  margin-bottom: 1.25rem;
  color: #fff;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.75rem;
}

article h2 {
  font-size: 1.5rem;
  margin-top: 2.75rem;
  margin-bottom: 1rem;
  color: #fff;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.4rem;
}

article h3 {
  font-size: 1.2rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--accent-color);
}

article h4 {
  font-size: 1.05rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

article p {
  margin-bottom: 1.15rem;
  color: var(--text-primary);
}

article ul, article ol {
  margin-bottom: 1.25rem;
  padding-left: 1.6rem;
}

article li {
  margin-bottom: 0.4rem;
}

/* TABLES */
article table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0 2rem;
  background-color: var(--bg-surface);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  font-size: 0.9rem;
}

article th, article td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  text-align: left;
  vertical-align: top;
}

article th {
  background-color: var(--bg-secondary);
  color: var(--accent-color);
  font-weight: 700;
}

article tr:hover td {
  background-color: var(--bg-hover);
}

/* CODE */
article code {
  font-family: var(--font-mono);
  background-color: var(--code-bg);
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  font-size: 0.88em;
  color: #fca5a5;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

article pre {
  position: relative;
  background-color: var(--code-bg);
  padding: 1.1rem 1.25rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.25rem 0 1.75rem;
  border: 1px solid var(--border-color);
}

article pre code {
  background: none;
  padding: 0;
  border: none;
  color: #e5e7eb;
  font-size: 0.88rem;
  line-height: 1.55;
}

.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.25rem 0.55rem;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.copy-btn:hover {
  color: #fff;
  border-color: var(--accent-color);
}

/* BLOCKQUOTE / CALLOUT */
article blockquote {
  border-left: 4px solid var(--accent-color);
  background: var(--accent-soft);
  padding: 0.9rem 1.25rem;
  margin: 1.25rem 0;
  border-radius: 0 6px 6px 0;
  color: var(--text-primary);
}

article blockquote p:last-child {
  margin-bottom: 0;
}

/* HUB CARDS GRID */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0 3.5rem;
}

.hub-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.hub-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-color);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.hub-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.hub-card-icon {
  font-size: 1.6rem;
}

.hub-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.45rem;
}

.hub-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  flex: 1;
}

.hub-card-footer {
  margin-top: 1.25rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* RESPONSIVE */
@media (max-width: 960px) {
  .doc-layout {
    flex-direction: column;
  }
  .doc-sidebar {
    width: 100%;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  .doc-main {
    padding: 1.5rem 1rem 3rem;
  }
  .doc-nav-links {
    display: none;
  }
}