/* ISOLeaf docs — palette mirrors frontend/isohub/src/styles/globals.css.
   Logo accent (#DC3C3B) is reused for the smoky horizontal/vertical separators
   so the brand colour subtly frames the layout. */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f8f7;
  --bg-tertiary: #f1efe8;
  --bg-input: #f8f8f7;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.18);
  --brand-soft: rgba(192, 57, 43, 0.15);
  --brand: #c0392b;
  --text-primary: #1a1a1a;
  --text-secondary: #555;
  --text-tertiary: #888;
  --text-mono: #185fa5;
  --accent: #185fa5;
  --accent-bg: #e6f1fb;
  --accent-text: #0c447c;
  --success: #1d9e75;
  --success-bg: #e1f5ee;
  --success-text: #0f6e56;
  --warning: #ba7517;
  --warning-bg: #faeeda;
  --warning-text: #633806;
  --danger: #c0392b;
  --danger-bg: #fbeae8;
  --danger-text: #7a1f15;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --header-h: 60px;
  --sidebar-w: 280px;
  --content-max: 880px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font-family: inherit; }

/* ── Top header ───────────────────────────────────────────────────────── */
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 16px;
  height: var(--header-h);
  padding: 0 24px;
  background: var(--bg-primary);
  border-bottom: 2px solid var(--brand-soft);
}
.brand-link { display: flex; align-items: center; gap: 10px; color: inherit; }
.brand-link:hover { text-decoration: none; }
.brand-link img { height: 32px; width: auto; display: block; }
.brand-text { line-height: 1.1; }
.brand-name { font-weight: 700; font-size: 15px; letter-spacing: -0.01em; }
.brand-sub { font-size: 11px; color: var(--text-tertiary); }

.search { position: relative; flex: 1; max-width: 460px; margin: 0 auto 0 24px; }
.search-input {
  width: 100%; height: 36px; padding: 0 30px 0 34px;
  font-family: inherit; font-size: 13px;
  background: var(--bg-secondary); color: var(--text-primary);
  border: 1px solid var(--border); border-radius: 8px;
  outline: none; transition: border-color 0.15s, background 0.15s;
}
.search-input:focus { border-color: var(--accent); background: var(--bg-primary); }
.search-icon {
  position: absolute; left: 11px; top: 50%; transform: translateY(-50%);
  font-size: 13px; color: var(--text-tertiary); pointer-events: none;
}
.search-clear {
  position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  width: 20px; height: 20px; border: 0; background: transparent;
  color: var(--text-tertiary); cursor: pointer; border-radius: 4px;
  display: none; align-items: center; justify-content: center; padding: 0;
  font-size: 13px;
}
.search-input:not(:placeholder-shown) ~ .search-clear { display: flex; }
.search-results {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0;
  max-height: 60vh; overflow-y: auto;
  background: var(--bg-primary); border: 1px solid var(--border);
  border-radius: 10px; box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
  display: none; z-index: 40;
}
.search-results.open { display: block; }
.search-empty, .search-hint {
  padding: 14px 16px; color: var(--text-tertiary); font-size: 12px;
}
.search-result {
  display: block; padding: 10px 14px; color: inherit;
  border-bottom: 1px solid var(--border); cursor: pointer;
}
.search-result:last-child { border-bottom: 0; }
.search-result:hover, .search-result.active { background: var(--accent-bg); text-decoration: none; }
.search-result-section {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--accent-text); font-weight: 600; margin-bottom: 2px;
}
.search-result-snippet { font-size: 12.5px; color: var(--text-secondary); line-height: 1.45; }
.search-result-snippet mark { background: rgba(192, 57, 43, 0.18); color: inherit; padding: 0 2px; border-radius: 2px; }

.lang-switch { display: flex; gap: 2px; padding: 2px; background: var(--bg-secondary); border-radius: 8px; }
.lang-btn {
  padding: 5px 12px; font-size: 12px; font-weight: 600;
  color: var(--text-tertiary); border-radius: 6px; line-height: 1;
}
.lang-btn:hover { text-decoration: none; color: var(--text-primary); }
.lang-btn.active { background: var(--brand); color: #fff; }
.back-app {
  font-size: 12.5px; color: var(--text-secondary);
  padding: 6px 10px; border-radius: 6px;
}
.back-app:hover { background: var(--bg-secondary); text-decoration: none; color: var(--text-primary); }

.menu-toggle {
  display: none; width: 36px; height: 36px;
  border: 1px solid var(--border); background: var(--bg-primary);
  border-radius: 8px; cursor: pointer; padding: 0;
  align-items: center; justify-content: center;
  color: var(--text-secondary);
}

/* ── Shell ────────────────────────────────────────────────────────────── */
.shell { display: grid; grid-template-columns: var(--sidebar-w) 1fr; align-items: start; }
.sidebar {
  position: sticky; top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  background: var(--bg-primary);
  border-right: 1px solid var(--brand-soft);
  padding: 18px 0;
}
.nav-section-title {
  padding: 4px 22px 10px; font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--text-tertiary); font-weight: 700;
}
.nav { padding: 0 10px; }
.nav-item {
  display: flex; align-items: center; gap: 6px;
  width: 100%; padding: 8px 12px;
  border: 0; background: transparent; cursor: pointer;
  border-radius: 6px; color: var(--text-secondary);
  font-size: 13.5px; line-height: 1.3; text-align: left;
  font-family: inherit; font-weight: 500;
  transition: background 0.15s, color 0.15s;
}
.nav-item:hover { background: var(--bg-secondary); color: var(--text-primary); }
.nav-item.active { background: var(--accent-bg); color: var(--accent-text); font-weight: 600; }
.nav-caret {
  width: 14px; flex-shrink: 0; color: var(--text-tertiary);
  font-size: 10px; transition: transform 0.18s;
}
.nav-item.expanded .nav-caret { transform: rotate(90deg); }
.nav-item-label { flex: 1; }

.subnav {
  display: none;
  padding: 4px 0 10px 28px;
  border-left: 1px solid var(--border);
  margin: 0 0 4px 22px;
}
.subnav.open { display: block; }
.sub-item {
  display: block; padding: 5px 10px;
  font-size: 12.5px; color: var(--text-tertiary);
  border-radius: 4px; line-height: 1.35;
}
.sub-item:hover { background: var(--bg-secondary); color: var(--text-primary); text-decoration: none; }
.sub-item.active { color: var(--accent-text); font-weight: 600; background: var(--accent-bg); }
.sub-item.level-3 { padding-left: 22px; font-size: 12px; }

/* ── Main + DocBlocks ─────────────────────────────────────────────────── */
.main { padding: 32px 40px 80px; min-width: 0; }
.content { max-width: var(--content-max); margin: 0 auto; }
.crumbs { font-size: 12px; color: var(--text-tertiary); margin-bottom: 18px; }
.crumbs a { color: var(--text-tertiary); }
.page-title { font-size: 28px; font-weight: 700; margin: 0 0 6px; letter-spacing: -0.01em; }
.page-sub { color: var(--text-secondary); margin-bottom: 28px; font-size: 14px; }

.db { margin: 0 0 18px; }
.db-h1 { font-size: 26px; font-weight: 700; margin: 32px 0 12px; letter-spacing: -0.01em; }
.db-h2 { font-size: 20px; font-weight: 700; margin: 30px 0 10px; padding-top: 4px; scroll-margin-top: calc(var(--header-h) + 16px); }
.db-h3 { font-size: 16px; font-weight: 600; margin: 22px 0 8px; scroll-margin-top: calc(var(--header-h) + 16px); }
.db-h4 { font-size: 14px; font-weight: 600; margin: 18px 0 6px; scroll-margin-top: calc(var(--header-h) + 16px); }
.db-heading-wrap { margin: 28px 0 12px; }
.db-heading-wrap > h2, .db-heading-wrap > h3, .db-heading-wrap > h4 { margin: 0 0 4px; }
.db-heading-sub { font-size: 13px; color: var(--text-tertiary); font-style: italic; margin: 0 0 6px; }
.db-p { margin: 0 0 14px; color: var(--text-primary); }
.db-p code, .db-list code, .db-table code, .db-callout code {
  font-family: var(--mono); font-size: 12.5px;
  background: var(--bg-tertiary); padding: 1px 6px; border-radius: 4px;
  color: var(--text-mono);
}
.db-list { margin: 0 0 14px; padding-left: 22px; }
.db-list li { margin: 4px 0; }
.db-code {
  background: #1a1a1a; color: #e6e6e6;
  border-radius: 8px; padding: 14px 16px; margin: 0 0 18px;
  font-family: var(--mono); font-size: 12.5px; line-height: 1.55;
  overflow-x: auto; white-space: pre;
}
.db-code .lang {
  display: inline-block; font-size: 10px; text-transform: uppercase;
  color: #999; margin-bottom: 8px; letter-spacing: 0.05em;
}
.db-diagram-ascii {
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: 8px; padding: 12px 14px; margin: 0 0 18px;
  font-family: var(--mono); font-size: 11px; line-height: 1.3;
  color: var(--text-mono); overflow-x: auto; white-space: pre;
}
.db-callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-bg); color: var(--accent-text);
  padding: 12px 14px; border-radius: 6px; margin: 0 0 18px;
}
.db-callout[data-tone="warning"] { border-color: var(--warning); background: var(--warning-bg); color: var(--warning-text); }
.db-callout[data-tone="success"] { border-color: var(--success); background: var(--success-bg); color: var(--success-text); }
.db-callout[data-tone="danger"]  { border-color: var(--danger);  background: var(--danger-bg);  color: var(--danger-text); }
.db-callout[data-tone="note"]    { border-color: var(--border-strong); background: var(--bg-tertiary); color: var(--text-secondary); }
.db-callout-title { font-weight: 600; margin: 0 0 4px; }
.db-table-wrap { overflow-x: auto; margin: 0 0 18px; border: 1px solid var(--border); border-radius: 8px; }
.db-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.db-table th, .db-table td { padding: 8px 12px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.db-table thead th { background: var(--bg-secondary); font-weight: 600; font-size: 12px; color: var(--text-secondary); }
.db-table tbody tr:last-child td { border-bottom: 0; }
.td-mono { font-family: var(--mono); color: var(--text-mono); font-size: 12.5px; }
.db-svg, .db-diagram {
  background: var(--bg-primary); border: 1px solid var(--border);
  border-radius: 8px; padding: 18px; margin: 0 0 18px; overflow-x: auto;
  display: flex; justify-content: center;
}
.db-svg svg, .db-diagram svg { max-width: 100%; height: auto; }
.db-image { margin: 0 0 18px; }
.db-image img { max-width: 100%; height: auto; border-radius: 8px; border: 1px solid var(--border); }
.db-image-caption { font-size: 12px; color: var(--text-tertiary); margin-top: 6px; }
.db-divider { border: 0; border-top: 1px solid var(--border); margin: 28px 0; }

/* ── Search match highlight in main content ───────────────────────────── */
.match-flash {
  animation: matchFlash 1.6s ease-out;
}
@keyframes matchFlash {
  0% { background: rgba(192, 57, 43, 0.18); }
  100% { background: transparent; }
}

/* ── Mobile ───────────────────────────────────────────────────────────── */
.scrim {
  display: none; position: fixed; inset: var(--header-h) 0 0 0;
  background: rgba(0, 0, 0, 0.4); z-index: 20;
}
.scrim.open { display: block; }
@media (max-width: 880px) {
  .topbar { padding: 0 14px; gap: 10px; }
  .search { margin-left: 8px; max-width: none; }
  .brand-sub { display: none; }
  .back-app { display: none; }
  .menu-toggle { display: inline-flex; }
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; top: var(--header-h); left: 0;
    width: 84vw; max-width: 320px;
    z-index: 25;
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    border-right: 1px solid var(--brand-soft);
    box-shadow: 0 0 24px rgba(0, 0, 0, 0.08);
  }
  .sidebar.open { transform: translateX(0); }
  .main { padding: 22px 18px 60px; }
}