/* ============================================================
   Tech Docs Theme — Light + Dark
   ============================================================ */

:root[data-theme="light"] {
  --bg:           #ffffff;
  --bg-alt:       #f6f8fa;
  --bg-sidebar:   #fafbfc;
  --text:         #1f2328;
  --text-muted:   #57606a;
  --border:       #d0d7de;
  --accent:       #0969da;
  --accent-hover: #0860c7;
  --accent-soft:  rgba(9, 105, 218, 0.08);
  --code-bg:      #f6f8fa;
  --shadow:       rgba(0,0,0,0.08);
}

:root[data-theme="dark"] {
  --bg:           #0d1117;
  --bg-alt:       #161b22;
  --bg-sidebar:   #010409;
  --text:         #e6edf3;
  --text-muted:   #8b949e;
  --border:       #30363d;
  --accent:       #2f81f7;
  --accent-hover: #58a6ff;
  --accent-soft:  rgba(47, 129, 247, 0.15);
  --code-bg:      #161b22;
  --shadow:       rgba(0,0,0,0.5);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
               "Sarabun", "Noto Sans Thai", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

/* ----- Topbar ----- */
.topbar {
  position: sticky; top: 0; z-index: 100;
  height: 56px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1400px;
  margin: 0 auto;
  height: 100%;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.brand {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 17px; color: var(--text);
}
.brand:hover { text-decoration: none; color: var(--text); }
.brand-icon {
  width: 28px;
  height: 28px;
  object-fit: contain;
  border-radius: 4px;
  flex-shrink: 0;
}

.mobile-toggle {
  display: none;
  background: transparent; border: none; color: var(--text);
  font-size: 22px; cursor: pointer; padding: 4px 8px;
}

.search-wrap { flex: 1; max-width: 520px; position: relative; }
#search {
  width: 100%;
  padding: 8px 36px 8px 12px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
#search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.search-kbd {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  font-size: 11px; font-family: inherit;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-alt);
  color: var(--text-muted);
  pointer-events: none;
}
.search-results {
  display: none;
  position: absolute; top: calc(100% + 6px); left: 0; right: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 24px var(--shadow);
  max-height: 420px;
  overflow-y: auto;
}
.search-item {
  display: block;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.search-item:hover { background: var(--accent-soft); text-decoration: none; }
.search-item:last-child { border-bottom: none; }
.search-cat {
  font-size: 11px; color: var(--text-muted); text-transform: uppercase;
  letter-spacing: 0.05em; margin-bottom: 2px;
}
.search-title { font-weight: 600; margin-bottom: 4px; }
.search-snippet { font-size: 13px; color: var(--text-muted); line-height: 1.5; }
.search-snippet mark {
  background: var(--accent-soft); color: var(--accent-hover);
  padding: 0 2px; border-radius: 2px;
}
.search-empty { padding: 16px; color: var(--text-muted); text-align: center; }

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 16px;
  color: var(--text);
  transition: border-color .15s;
}
.theme-toggle:hover { border-color: var(--accent); }

/* ----- Layout ----- */
.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  max-width: 1400px;
  margin: 0 auto;
  min-height: calc(100vh - 56px);
}

/* ----- Sidebar ----- */
.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 24px 12px;
  position: sticky; top: 56px;
  height: calc(100vh - 56px);
  overflow-y: auto;
}
.sidebar-nav { font-size: 14px; }
.nav-group { margin-bottom: 20px; }
.nav-group-title {
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--text-muted);
  padding: 4px 12px 6px;
}
.nav-list { list-style: none; padding: 0; margin: 0; }
.nav-list li a {
  display: block;
  padding: 6px 12px;
  color: var(--text-muted);
  border-radius: 4px;
  margin-bottom: 1px;
  border-left: 2px solid transparent;
}
.nav-list li a:hover {
  background: var(--accent-soft); color: var(--text);
  text-decoration: none;
}
.nav-list li a.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  border-left-color: var(--accent);
}

/* ----- Main content ----- */
.main { padding: 32px 48px; max-width: 100%; overflow-x: hidden; }
.content { max-width: 820px; }
.breadcrumb {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.content h1 {
  font-size: 32px; line-height: 1.3;
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.content h2 {
  font-size: 22px; margin: 36px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.content h3 { font-size: 18px; margin: 28px 0 10px; }
.content h4 { font-size: 15px; margin: 20px 0 8px; }
.content p { margin: 0 0 14px; }
.content ul, .content ol { margin: 0 0 14px; padding-left: 24px; }
.content li { margin-bottom: 4px; }

.content table {
  border-collapse: collapse;
  margin: 16px 0;
  width: 100%;
  font-size: 14px;
  display: block;
  overflow-x: auto;
}
.content th, .content td {
  border: 1px solid var(--border);
  padding: 8px 12px; text-align: left;
}
.content th { background: var(--bg-alt); font-weight: 600; }
.content tr:nth-child(even) td { background: var(--bg-alt); }

.content blockquote {
  border-left: 4px solid var(--accent);
  margin: 16px 0;
  padding: 10px 16px;
  background: var(--accent-soft);
  color: var(--text);
  border-radius: 0 6px 6px 0;
}
.content blockquote p:last-child { margin-bottom: 0; }

/* ----- Images ----- */
.content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 20px auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 2px 8px var(--shadow);
}
/* Caption: italic ใต้รูปทันที (ใช้ *...* ใน markdown หลังบรรทัดรูป) */
.content p > img + br + em,
.content p:has(> img) + p > em:only-child {
  display: block;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}
.content p:has(> img:only-child) {
  text-align: center;
}
/* Stand-alone caption paragraph: italic + center */
.content p > em:only-child {
  display: block;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: -12px;
  margin-bottom: 24px;
}

/* ----- Collapsible (details/summary) ----- */
.content details {
  margin: 14px 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-alt);
  overflow: hidden;
}
.content details > summary {
  padding: 10px 14px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background 0.15s;
}
.content details > summary::-webkit-details-marker { display: none; }
.content details > summary::before {
  content: "▶";
  font-size: 9px;
  transition: transform 0.15s;
  flex-shrink: 0;
}
.content details[open] > summary::before { transform: rotate(90deg); }
.content details > summary:hover {
  background: var(--accent-soft);
  color: var(--text);
}
.content details[open] > summary {
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.content details > *:not(summary) {
  margin: 0;
}
.content details > pre {
  margin: 0;
  border-radius: 0;
  border: none;
}
.content details > .codehilite {
  margin: 0;
}
.content details > .codehilite > pre {
  border-radius: 0;
  border: none;
  margin: 0;
}

/* ----- Code ----- */
.content :not(pre) > code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;
  color: var(--accent-hover);
  border: 1px solid var(--border);
}
.content pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px;
  overflow-x: auto;
  margin: 16px 0;
  position: relative;
}
.content pre code {
  background: transparent;
  padding: 0;
  font-size: 13px;
  line-height: 1.6;
  font-family: "JetBrains Mono", Menlo, Consolas, monospace;
  color: var(--text);
}
.copy-btn {
  position: absolute; top: 8px; right: 8px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  opacity: 0;
  transition: opacity .15s, background .15s;
}
.content pre:hover .copy-btn { opacity: 1; }
.copy-btn:hover { background: var(--accent); color: white; border-color: var(--accent); }
.copy-btn.copied { background: #2da44e; color: white; border-color: #2da44e; opacity: 1; }

/* Light theme: switch hljs CSS via JS — fallback colors */
:root[data-theme="light"] .content pre code { color: #24292e; }

/* ----- Mobile ----- */
@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    top: 56px; left: 0;
    width: 280px; height: calc(100vh - 56px);
    transform: translateX(-100%);
    transition: transform .25s;
    z-index: 90;
    border-right: 1px solid var(--border);
  }
  .sidebar.open { transform: translateX(0); }
  .mobile-toggle { display: block; }
  .main { padding: 24px 18px; }
  .brand-text { display: none; }
  .search-kbd { display: none; }
}