/* TopAds Documentation Portal — v4.2.2 */
:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --bg-code: #f4f5f7;
  --border: #e5e7eb;
  --text: #0f172a;
  --text-soft: #475569;
  --text-mute: #64748b;
  --primary: #4f46e5;
  --primary-soft: #eef2ff;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 4px 12px rgba(15, 23, 42, .04);
  --sidebar-w: 280px;
  --toc-w: 220px;
  --header-h: 60px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

[data-theme="dark"] {
  --bg: #0b1220;
  --bg-soft: #0f172a;
  --bg-code: #111827;
  --border: #1f2937;
  --text: #e5e7eb;
  --text-soft: #cbd5e1;
  --text-mute: #94a3b8;
  --primary: #818cf8;
  --primary-soft: #1e1b4b;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 12px rgba(0,0,0,.3);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--primary); color: #fff; padding: 8px 12px; border-radius: 4px;
}
.skip:focus { left: 12px; top: 12px; z-index: 1000; }

/* ---------- Topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  display: flex; align-items: center; gap: 16px;
  padding: 0 20px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(180%) blur(10px);
}
.menu-btn {
  display: none;
  background: transparent; border: 1px solid var(--border);
  width: 36px; height: 36px; border-radius: var(--radius);
  color: var(--text); cursor: pointer; font-size: 18px;
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand .logo {
  width: 34px; height: 34px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  color: #fff; font-weight: 700;
  display: grid; place-items: center; font-size: 16px;
}
.brand-name { font-weight: 700; font-size: 15px; line-height: 1; }
.brand-ver { font-size: 11px; color: var(--text-mute); margin-top: 3px; }
.search { flex: 1; max-width: 520px; margin: 0 auto; }
.search input {
  width: 100%; height: 38px; padding: 0 14px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-soft); color: var(--text); font-size: 14px;
  font-family: inherit;
}
.search input:focus { outline: 2px solid var(--primary); outline-offset: -1px; }
.topbar-actions { display: flex; gap: 8px; }
.ghost {
  background: transparent; border: 1px solid var(--border);
  height: 36px; padding: 0 12px; border-radius: var(--radius);
  color: var(--text); cursor: pointer; font-size: 14px;
}
.ghost:hover { background: var(--bg-soft); }

/* ---------- Layout ---------- */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--toc-w);
  gap: 0;
  max-width: 1440px;
  margin: 0 auto;
}
.sidebar, .toc {
  position: sticky; top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 24px 16px;
  border-right: 1px solid var(--border);
}
.toc { border-right: none; border-left: 1px solid var(--border); }
.content { padding: 32px 40px 80px; min-width: 0; }

/* ---------- Sidebar Nav ---------- */
.nav-group { margin-bottom: 18px; }
.nav-group h4 {
  margin: 0 8px 6px; padding: 4px 8px;
  font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-mute);
}
.nav-group ul { list-style: none; margin: 0; padding: 0; }
.nav-group li a {
  display: block; padding: 6px 12px;
  border-radius: 6px;
  color: var(--text-soft); font-size: 14px;
  text-decoration: none;
  border-left: 2px solid transparent;
}
.nav-group li a:hover { background: var(--bg-soft); color: var(--text); }
.nav-group li a.active {
  background: var(--primary-soft); color: var(--primary);
  border-left-color: var(--primary); font-weight: 500;
}

/* ---------- Content Typography ---------- */
.content h1 {
  font-size: 32px; margin: 0 0 8px; line-height: 1.2;
  letter-spacing: -0.02em;
}
.content h2 {
  font-size: 24px; margin: 48px 0 12px;
  padding-top: 16px; border-top: 1px solid var(--border);
  letter-spacing: -0.01em;
}
.content section:first-of-type h2 { border-top: none; padding-top: 0; margin-top: 32px; }
.content h3 { font-size: 18px; margin: 28px 0 10px; }
.content h4 { font-size: 15px; margin: 20px 0 8px; color: var(--text-soft); }
.content p { margin: 0 0 14px; color: var(--text-soft); }
.content ul, .content ol { padding-left: 22px; color: var(--text-soft); }
.content li { margin-bottom: 6px; }
.content strong { color: var(--text); }

.lead { font-size: 17px; color: var(--text-soft); margin-bottom: 24px; }

/* Badges */
.badge {
  display: inline-block; padding: 2px 10px;
  border-radius: 999px; font-size: 12px; font-weight: 500;
  background: var(--primary-soft); color: var(--primary);
  margin-right: 6px;
}
.badge.success { background: rgba(22,163,74,.12); color: var(--success); }
.badge.warning { background: rgba(217,119,6,.12); color: var(--warning); }
.badge.danger  { background: rgba(220,38,38,.12); color: var(--danger); }

/* Cards / grid */
.grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  margin: 16px 0 24px;
}
.card {
  padding: 16px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg); box-shadow: var(--shadow);
}
.card h4 { margin: 0 0 4px; color: var(--text); }
.card p { margin: 0; font-size: 13px; color: var(--text-mute); }

/* Callouts */
.callout {
  border: 1px solid var(--border); border-left: 4px solid var(--primary);
  background: var(--bg-soft);
  padding: 12px 16px; margin: 16px 0; border-radius: var(--radius);
}
.callout.info    { border-left-color: var(--primary); }
.callout.success { border-left-color: var(--success); }
.callout.warning { border-left-color: var(--warning); }
.callout.danger  { border-left-color: var(--danger); }
.callout p:last-child { margin-bottom: 0; }
.callout .title { font-weight: 600; color: var(--text); margin-bottom: 4px; }

/* Code */
code {
  font-family: var(--mono); font-size: 13px;
  background: var(--bg-code); padding: 2px 6px; border-radius: 4px;
  color: var(--text);
}
pre {
  margin: 12px 0 20px; padding: 0;
  background: var(--bg-code); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
pre code {
  display: block; padding: 14px 16px;
  background: transparent; border-radius: 0;
  font-size: 13px; line-height: 1.6;
  overflow-x: auto;
}

/* Tables */
.tbl {
  width: 100%; border-collapse: collapse; margin: 12px 0 20px;
  font-size: 14px;
}
.tbl th, .tbl td {
  text-align: left; padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.tbl th {
  background: var(--bg-soft); font-weight: 600;
  color: var(--text); font-size: 13px;
}
.tbl code { font-size: 12px; }

/* Imported markdown content tables & blocks */
.content section table {
  width: 100%; border-collapse: collapse; margin: 12px 0 20px;
  font-size: 14px; display: block; overflow-x: auto;
}
.content section th, .content section td {
  text-align: left; padding: 10px 12px;
  border-bottom: 1px solid var(--border); vertical-align: top;
}
.content section th { background: var(--bg-soft); font-weight: 600; font-size: 13px; }
.content section blockquote {
  margin: 12px 0 20px; padding: 10px 16px;
  border-left: 3px solid var(--border);
  background: var(--bg-soft); border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-mute);
}
.content section blockquote p:last-child { margin-bottom: 0; }
.content section img { max-width: 100%; height: auto; border-radius: var(--radius); }
.content section hr { border: 0; border-top: 1px solid var(--border); margin: 28px 0; }
.content section input[type="checkbox"] { margin-right: 6px; }


/* TOC */
.toc h5 {
  margin: 0 0 10px; font-size: 11px;
  text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-mute); font-weight: 600;
}
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 0; }
.toc a {
  display: block; padding: 4px 10px;
  font-size: 13px; color: var(--text-mute);
  border-left: 2px solid transparent;
}
.toc a:hover { color: var(--text); text-decoration: none; }
.toc a.active { color: var(--primary); border-left-color: var(--primary); }

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  margin-top: 64px; padding-top: 24px;
  color: var(--text-mute); font-size: 13px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.footer a { color: var(--primary); font-weight: 500; }

/* Search results */
.search-empty {
  padding: 40px; text-align: center; color: var(--text-mute);
}
.hidden { display: none !important; }
mark { background: #fef08a; color: #422006; padding: 0 2px; border-radius: 2px; }
[data-theme="dark"] mark { background: #7c2d12; color: #fef3c7; }

/* Backdrop for mobile */
.backdrop {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.4); z-index: 40;
}
.backdrop.show { display: block; }

/* Responsive */
@media (max-width: 1100px) {
  .layout { grid-template-columns: var(--sidebar-w) 1fr; }
  .toc { display: none; }
}
@media (max-width: 780px) {
  :root { --sidebar-w: 260px; }
  .menu-btn { display: block; }
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; top: var(--header-h); left: 0;
    width: var(--sidebar-w); height: calc(100vh - var(--header-h));
    background: var(--bg); z-index: 45;
    transform: translateX(-100%); transition: transform .2s ease;
    box-shadow: var(--shadow);
  }
  .sidebar.open { transform: translateX(0); }
  .content { padding: 24px 20px 60px; }
  .content h1 { font-size: 26px; }
  .content h2 { font-size: 20px; }
  .search { max-width: none; }
  .brand-ver { display: none; }
}

/* Download / call-to-action button */
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.55rem .95rem;border-radius:.5rem;
  background:#D81C20;color:#fff;font-weight:600;font-size:.9rem;text-decoration:none;
  border:1px solid #b8171b;transition:filter .15s ease}
.btn:hover{filter:brightness(1.08);text-decoration:none}

/* ---------- Topic pagination ---------- */
.content section.pg-hidden { display: none; }

.pager { margin: 32px 0 28px; border-top: 1px solid var(--border); padding-top: 20px; }
.pager.hidden { display: none; }
.pager-progress {
  height: 4px; width: 100%; background: var(--bg-soft);
  border-radius: 999px; overflow: hidden; margin-bottom: 14px;
}
.pager-progress span {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--primary), #7c3aed);
  transition: width .3s ease;
}
.pager-meta {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; font-size: 12px; color: var(--text-mute); margin-bottom: 14px;
}
.pager-hint kbd {
  font-family: var(--mono); font-size: 11px; padding: 1px 5px;
  border: 1px solid var(--border); border-bottom-width: 2px;
  border-radius: 4px; background: var(--bg-soft); color: var(--text-soft);
}
.pager-links { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.pager-link {
  display: flex; flex-direction: column; gap: 4px;
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px 14px; background: var(--bg); color: var(--text);
  transition: border-color .15s ease, background .15s ease, transform .15s ease;
  min-width: 0;
}
.pager-link:hover { border-color: var(--primary); background: var(--bg-soft); transform: translateY(-1px); }
.pager-link.next { text-align: right; align-items: flex-end; }
.pager-link.disabled { opacity: .45; pointer-events: none; }
.pager-dir { font-size: 11px; text-transform: uppercase; letter-spacing: .04em; color: var(--text-mute); }
.pager-title {
  font-size: 14px; font-weight: 600; color: var(--text);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 100%;
}
.pager-top {
  margin: 16px auto 0; display: block;
  background: transparent; border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text-soft); font-size: 12px; padding: 7px 14px; cursor: pointer;
}
.pager-top:hover { border-color: var(--primary); color: var(--primary); }

@media (max-width: 620px) {
  .pager-links { grid-template-columns: 1fr; }
  .pager-link.next { text-align: left; align-items: flex-start; }
}

/* ---------- Topic filter (sidebar) ---------- */
.nav-filter {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-soft);
  padding: 10px;
  margin: 0 0 18px;
}
.nav-filter.active { border-color: var(--primary); }
.nav-filter-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.nav-filter-head h4 {
  margin: 0; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--text-mute);
}
.nav-filter-clear {
  background: transparent; border: 0; cursor: pointer; padding: 2px 4px;
  font-size: 11px; color: var(--primary);
}
.nav-filter-clear:hover { text-decoration: underline; }
.nav-filter-label {
  display: block; margin: 10px 0 4px; font-size: 11px; color: var(--text-mute);
}
.nav-filter-select {
  width: 100%; padding: 6px 8px; font: inherit; font-size: 13px;
  color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 6px;
}
.nav-filter-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag-chip {
  cursor: pointer; font: inherit; font-size: 11px; line-height: 1;
  padding: 5px 8px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text-soft);
}
.tag-chip:hover { border-color: var(--primary); color: var(--text); }
.tag-chip.on { background: var(--primary); border-color: var(--primary); color: #fff; }
.nav-filter-count { margin-top: 10px; font-size: 11px; color: var(--text-mute); }
.nav-hidden { display: none !important; }