/* ─── Design tokens ───────────────────────────────────────────────────── */
:root {
  --tt-primary: #2563eb;
  --tt-primary-deep: #1d4ed8;
  --tt-bg: #ffffff;
  --tt-bg-soft: #f6f5f3;
  --tt-bg-code: #f6f5f3;
  --tt-text: #0c0a09;
  --tt-text-soft: #52525b;
  --tt-text-muted: #71717a;
  --tt-text-faint: #a1a1aa;
  --tt-border: #e7e5e4;
  --tt-border-soft: #f0efed;
  --tt-shadow-sm: 0 1px 2px rgba(15,23,42,.05);
  --tt-shadow-md: 0 4px 12px rgba(15,23,42,.08);
  --tt-radius: 8px;
  --tt-radius-sm: 6px;
  --tt-radius-lg: 12px;
  --tt-header-h: 56px;
  --tt-sidebar-w: 268px;
  --tt-toc-w: 200px;
  --tt-content-max: 760px;
  --tt-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --tt-font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
}
html.dark {
  --tt-bg: #09090b;
  --tt-bg-soft: #0c0a09;
  --tt-bg-code: #18181b;
  --tt-text: #fafaf9;
  --tt-text-soft: #d4d4d8;
  --tt-text-muted: #a1a1aa;
  --tt-text-faint: #71717a;
  --tt-border: #27272a;
  --tt-border-soft: #1f1f23;
  --tt-shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --tt-shadow-md: 0 8px 24px rgba(0,0,0,.5);
  --tt-primary: #3b82f6;
  --tt-primary-deep: #2563eb;
}

/* ─── Reset ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-padding-top: calc(var(--tt-header-h) + 16px); }
body {
  font-family: var(--tt-font);
  font-size: 15px;
  line-height: 1.65;
  color: var(--tt-text);
  background: var(--tt-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--tt-primary); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }
button { font-family: inherit; cursor: pointer; }
kbd {
  font-family: var(--tt-font-mono);
  font-size: 11px;
  padding: 2px 5px;
  border: 1px solid var(--tt-border);
  border-radius: 4px;
  background: var(--tt-bg-soft);
  color: var(--tt-text-soft);
  box-shadow: 0 1px 0 var(--tt-border);
}
::selection { background: rgba(37, 99, 235, .2); }

/* ─── Header ─────────────────────────────────────────────────────────── */
.tt-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--tt-border);
}
html.dark .tt-header { background: rgba(9,9,11,.85); }

.tt-header-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  height: var(--tt-header-h);
  padding: 0 16px;
  max-width: 1440px;
  margin: 0 auto;
}
.tt-nav-toggle {
  display: none;
  background: none;
  border: 0;
  color: var(--tt-text);
  padding: 8px;
  border-radius: var(--tt-radius-sm);
}
.tt-nav-toggle:hover { background: var(--tt-bg-soft); }

.tt-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.015em;
  color: var(--tt-text);
}
.tt-brand:hover { text-decoration: none; }
.tt-brand-text { color: var(--tt-text); }
.tt-brand-dot { color: var(--tt-primary); }
.tt-brand-suffix {
  font-size: 12px;
  font-weight: 500;
  color: var(--tt-text-muted);
  padding-left: 8px;
  border-left: 1px solid var(--tt-border);
}

.tt-search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  max-width: 320px;
  padding: 7px 10px;
  background: var(--tt-bg-soft);
  border: 1px solid var(--tt-border);
  border-radius: var(--tt-radius-sm);
  color: var(--tt-text-muted);
  font-size: 13px;
  margin-left: 24px;
}
.tt-search-trigger:hover { border-color: var(--tt-text-faint); }
.tt-search-trigger span { flex: 1; text-align: left; }
.tt-search-trigger kbd { font-size: 10px; }

.tt-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}
.tt-theme-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: none;
  border: 0;
  color: var(--tt-text-soft);
  border-radius: var(--tt-radius-sm);
}
.tt-theme-btn:hover { background: var(--tt-bg-soft); color: var(--tt-text); }
.tt-theme-btn .tt-icon-sun { display: none; }
.tt-theme-btn .tt-icon-moon { display: block; }
html.dark .tt-theme-btn .tt-icon-sun { display: block; }
html.dark .tt-theme-btn .tt-icon-moon { display: none; }

.tt-console-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  font-weight: 600;
  padding: 7px 12px;
  background: var(--tt-text);
  color: var(--tt-bg);
  border-radius: var(--tt-radius-sm);
}
.tt-console-link:hover { text-decoration: none; opacity: 0.9; }

/* ─── Shell layout ───────────────────────────────────────────────────── */
.tt-shell {
  display: grid;
  grid-template-columns: var(--tt-sidebar-w) minmax(0, 1fr) var(--tt-toc-w);
  max-width: 1440px;
  margin: 0 auto;
  min-height: calc(100vh - var(--tt-header-h));
}

/* ─── Sidebar ────────────────────────────────────────────────────────── */
.tt-sidebar {
  position: sticky;
  top: var(--tt-header-h);
  height: calc(100vh - var(--tt-header-h));
  overflow-y: auto;
  padding: 24px 12px;
  border-right: 1px solid var(--tt-border);
  background: var(--tt-bg);
}
.tt-sidebar::-webkit-scrollbar { width: 6px; }
.tt-sidebar::-webkit-scrollbar-thumb { background: var(--tt-border); border-radius: 3px; }
.tt-sidebar-backdrop { display: none; }

.tt-nav-section { margin-bottom: 18px; }
.tt-nav-section-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--tt-text-muted);
  padding: 0 12px;
  margin: 0 0 6px 0;
}

.tt-nav-item {
  position: relative;
}
.tt-nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: var(--tt-radius-sm);
  font-size: 13.5px;
  color: var(--tt-text-soft);
  line-height: 1.4;
  cursor: pointer;
}
.tt-nav-link:hover { background: var(--tt-bg-soft); color: var(--tt-text); text-decoration: none; }
.tt-nav-link.active {
  background: rgba(37, 99, 235, .08);
  color: var(--tt-primary);
  font-weight: 600;
}
html.dark .tt-nav-link.active { background: rgba(59, 130, 246, .15); }
.tt-nav-link-icon { flex-shrink: 0; opacity: 0.8; }
.tt-nav-link-text { flex: 1; }
.tt-nav-link-chevron { transition: transform .15s; opacity: 0.5; }
.tt-nav-item.expanded > .tt-nav-link .tt-nav-link-chevron { transform: rotate(90deg); }

.tt-nav-badge {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 2px 5px;
  background: rgba(37, 99, 235, .12);
  color: var(--tt-primary);
  border-radius: 4px;
}
.tt-nav-soon {
  font-size: 10px;
  color: var(--tt-text-faint);
  font-style: italic;
}

.tt-nav-sublist {
  list-style: none;
  margin: 0;
  padding: 0 0 4px 14px;
  border-left: 1px solid var(--tt-border-soft);
  margin-left: 20px;
  display: none;
}
.tt-nav-item.expanded > .tt-nav-sublist { display: block; }
.tt-nav-sublist .tt-nav-link { font-size: 13px; padding: 5px 10px; }

/* ─── Main content ───────────────────────────────────────────────────── */
.tt-main {
  padding: 32px 48px 64px 48px;
  min-width: 0;
}
.tt-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--tt-text-muted);
  margin-bottom: 16px;
}
.tt-breadcrumbs a { color: var(--tt-text-muted); }
.tt-breadcrumbs a:hover { color: var(--tt-text); text-decoration: none; }
.tt-breadcrumbs .sep { opacity: 0.4; }

.tt-article {
  max-width: var(--tt-content-max);
  color: var(--tt-text);
}
.tt-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 80px 0;
  color: var(--tt-text-muted);
  font-size: 13px;
}
.tt-loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--tt-border);
  border-top-color: var(--tt-primary);
  border-radius: 50%;
  animation: tt-spin 0.8s linear infinite;
}
@keyframes tt-spin { to { transform: rotate(360deg); } }

/* ─── Article typography (markdown rendered) ──────────────────────── */
.tt-article h1 {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 8px 0;
  color: var(--tt-text);
}
.tt-article h1 + p { font-size: 16px; color: var(--tt-text-soft); margin-top: 0; }
.tt-article h2 {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin: 40px 0 12px 0;
  padding-top: 4px;
  scroll-margin-top: calc(var(--tt-header-h) + 16px);
  color: var(--tt-text);
}
.tt-article h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 28px 0 8px 0;
  scroll-margin-top: calc(var(--tt-header-h) + 16px);
  color: var(--tt-text);
}
.tt-article h4 {
  font-size: 15px;
  font-weight: 700;
  margin: 20px 0 6px 0;
  color: var(--tt-text);
}
.tt-article p { margin: 0 0 14px 0; }
.tt-article ul, .tt-article ol { margin: 0 0 14px 0; padding-left: 24px; }
.tt-article li { margin-bottom: 4px; }
.tt-article hr {
  border: 0;
  border-top: 1px solid var(--tt-border);
  margin: 32px 0;
}
.tt-article blockquote {
  margin: 16px 0;
  padding: 12px 16px;
  border-left: 3px solid var(--tt-primary);
  background: var(--tt-bg-soft);
  border-radius: 0 var(--tt-radius-sm) var(--tt-radius-sm) 0;
  font-size: 14px;
  color: var(--tt-text-soft);
}
.tt-article blockquote p { margin: 0; }

/* Inline code */
.tt-article code:not([class*="language-"]) {
  font-family: var(--tt-font-mono);
  font-size: 0.875em;
  padding: 2px 6px;
  background: var(--tt-bg-code);
  border: 1px solid var(--tt-border);
  border-radius: 4px;
  color: var(--tt-primary);
}

/* Code blocks */
.tt-article pre {
  position: relative;
  background: var(--tt-bg-code) !important;
  border: 1px solid var(--tt-border);
  border-radius: var(--tt-radius);
  padding: 14px 16px !important;
  margin: 12px 0 18px 0;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.55;
}
html.dark .tt-article pre { background: #18181b !important; }
.tt-article pre code {
  font-family: var(--tt-font-mono) !important;
  background: transparent !important;
  padding: 0 !important;
  border: 0 !important;
  border-radius: 0 !important;
  color: var(--tt-text) !important;
}
.tt-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--tt-bg);
  border: 1px solid var(--tt-border);
  color: var(--tt-text-muted);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 4px;
  opacity: 0;
  transition: opacity .15s;
}
.tt-article pre:hover .tt-copy-btn { opacity: 1; }
.tt-copy-btn:hover { color: var(--tt-text); }
.tt-copy-btn.copied { color: #16a34a; }

/* Tables */
.tt-article table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}
.tt-article th, .tt-article td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--tt-border-soft);
}
.tt-article th {
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--tt-text-muted);
  background: var(--tt-bg-soft);
  border-bottom: 1px solid var(--tt-border);
}
.tt-article tbody tr:hover { background: var(--tt-bg-soft); }

/* Callouts (rendered via marked extension or naked HTML) */
.tt-callout {
  display: flex;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--tt-radius);
  border: 1px solid var(--tt-border);
  background: var(--tt-bg-soft);
  margin: 16px 0;
  font-size: 14px;
}
.tt-callout.info { border-color: rgba(37,99,235,.3); background: rgba(37,99,235,.06); }
.tt-callout.warn { border-color: rgba(217,119,6,.3); background: rgba(217,119,6,.07); }
.tt-callout.danger { border-color: rgba(220,38,38,.3); background: rgba(220,38,38,.07); }
.tt-callout-icon { flex-shrink: 0; padding-top: 1px; }
.tt-callout-body { flex: 1; }
.tt-callout-body :first-child { margin-top: 0; }
.tt-callout-body :last-child { margin-bottom: 0; }

/* Pager */
.tt-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  max-width: var(--tt-content-max);
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--tt-border);
}
.tt-pager-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--tt-border);
  border-radius: var(--tt-radius);
  color: var(--tt-text);
  transition: border-color .15s;
}
.tt-pager-link:hover { border-color: var(--tt-primary); text-decoration: none; }
.tt-pager-link.next { text-align: right; }
.tt-pager-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--tt-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.tt-pager-title {
  font-size: 14px;
  font-weight: 600;
}
.tt-pager-empty { /* keep grid cell so the next link still right-aligns */ }

.tt-foot {
  max-width: var(--tt-content-max);
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--tt-border-soft);
  font-size: 12px;
  color: var(--tt-text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}
.tt-foot a { color: var(--tt-text-muted); }
.tt-foot a:hover { color: var(--tt-text); text-decoration: none; }
.tt-foot-sep { color: var(--tt-text-faint); }

/* ─── Right TOC rail ─────────────────────────────────────────────────── */
.tt-toc {
  position: sticky;
  top: var(--tt-header-h);
  height: calc(100vh - var(--tt-header-h));
  overflow-y: auto;
  padding: 32px 24px 32px 16px;
  font-size: 13px;
}
.tt-toc-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--tt-text-muted);
  margin-bottom: 10px;
}
.tt-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--tt-border-soft);
}
.tt-toc-list li { line-height: 1.5; }
.tt-toc-list a {
  display: block;
  padding: 4px 10px;
  margin-left: -1px;
  font-size: 12.5px;
  color: var(--tt-text-muted);
  border-left: 1px solid transparent;
}
.tt-toc-list a:hover { color: var(--tt-text); text-decoration: none; }
.tt-toc-list a.active {
  color: var(--tt-primary);
  border-left-color: var(--tt-primary);
}
.tt-toc-list .h3 { padding-left: 22px; }

/* ─── Search modal ───────────────────────────────────────────────────── */
.tt-search-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 96px;
}
.tt-search-modal[hidden] { display: none; }
.tt-search-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15,23,42,.5);
  backdrop-filter: blur(4px);
}
html.dark .tt-search-backdrop { background: rgba(0,0,0,.7); }
.tt-search-panel {
  position: relative;
  width: 100%;
  max-width: 560px;
  margin: 0 16px;
  background: var(--tt-bg);
  border: 1px solid var(--tt-border);
  border-radius: var(--tt-radius-lg);
  box-shadow: var(--tt-shadow-md);
  overflow: hidden;
}
.tt-search-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--tt-border);
}
.tt-search-input-row svg { flex-shrink: 0; color: var(--tt-text-muted); }
.tt-search-input-row input {
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  font-family: inherit;
  font-size: 15px;
  color: var(--tt-text);
}
.tt-search-input-row input::placeholder { color: var(--tt-text-muted); }
.tt-search-results { max-height: 380px; overflow-y: auto; padding: 6px; }
.tt-search-result {
  display: block;
  padding: 8px 12px;
  border-radius: var(--tt-radius-sm);
  color: var(--tt-text);
  cursor: pointer;
}
.tt-search-result.active, .tt-search-result:hover {
  background: var(--tt-bg-soft);
  text-decoration: none;
}
.tt-search-result-title { font-size: 14px; font-weight: 600; }
.tt-search-result-path { font-size: 11px; color: var(--tt-text-muted); margin-top: 1px; }
.tt-search-empty { padding: 24px; text-align: center; color: var(--tt-text-muted); font-size: 13px; }
.tt-search-foot {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 14px;
  border-top: 1px solid var(--tt-border);
  background: var(--tt-bg-soft);
  font-size: 11px;
  color: var(--tt-text-muted);
}
.tt-search-foot kbd { margin-right: 4px; font-size: 9px; }

/* ─── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .tt-shell { grid-template-columns: var(--tt-sidebar-w) minmax(0, 1fr); }
  .tt-toc { display: none; }
}
@media (max-width: 820px) {
  .tt-nav-toggle { display: inline-flex; }
  .tt-shell { grid-template-columns: 1fr; }
  .tt-sidebar {
    position: fixed;
    top: var(--tt-header-h);
    left: 0;
    width: 288px;
    height: calc(100vh - var(--tt-header-h));
    z-index: 60;
    transform: translateX(-100%);
    transition: transform .25s ease;
    box-shadow: var(--tt-shadow-md);
  }
  body.nav-open .tt-sidebar { transform: translateX(0); }
  body.nav-open .tt-sidebar-backdrop {
    display: block;
    position: fixed;
    inset: var(--tt-header-h) 0 0 0;
    background: rgba(15,23,42,.4);
    z-index: 55;
  }
  .tt-search-trigger { display: none; }
  .tt-main { padding: 24px 20px 48px 20px; }
  .tt-article h1 { font-size: 26px; }
  .tt-article h2 { font-size: 19px; }
  .tt-console-link { padding: 6px 10px; font-size: 12px; }
  .tt-console-link svg { display: none; }
}

/* ─── Print ──────────────────────────────────────────────────────────── */
@media print {
  .tt-header, .tt-sidebar, .tt-toc, .tt-pager, .tt-foot, .tt-copy-btn { display: none !important; }
  .tt-shell { display: block; }
  .tt-main { padding: 0; }
}