:root {
  --ds-bg: #ffffff;
  --ds-bg-alt: #f8fafc;
  --ds-border: #e5e7eb;
  --ds-text: #0f172a;
  --ds-muted: #64748b;
  --ds-accent: #3b82f6;
  --ds-accent-bg: #eff6ff;
  --ds-accent-line: #bfdbfe;
  --ds-amber: #f59e0b;
  --ds-amber-bg: #fef3e2;
  --ds-top-h: 64px;
  --ds-side-w: 260px;
}

[data-theme="dark"] {
  --ds-bg: #0b0f19;
  --ds-bg-alt: #111827;
  --ds-border: #1f2937;
  --ds-text: #e5e7eb;
  --ds-muted: #9ca3af;
  --ds-accent: #60a5fa;
  --ds-accent-bg: rgba(96, 165, 250, 0.12);
  --ds-accent-line: rgba(96, 165, 250, 0.35);
  --ds-amber-bg: rgba(245, 158, 11, 0.14);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--ds-bg);
  color: var(--ds-text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--ds-accent); outline-offset: 2px; }
.ds-muted { color: var(--ds-muted); font-size: 14px; }

/* ---------- buttons ---------- */

.ds-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: none;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}

.ds-btn-primary { background: var(--ds-accent); color: #fff; font-weight: 600; }
.ds-btn-primary:hover { filter: brightness(1.06); }
.ds-btn-outline { border-color: var(--ds-accent); color: var(--ds-accent); font-weight: 600; }
.ds-btn-outline:hover { background: var(--ds-accent-bg); }
.ds-btn-ghost { width: 100%; border-color: var(--ds-border); color: var(--ds-muted); }
.ds-btn-ghost:hover { background: var(--ds-bg-alt); }

/* ---------- top bar ---------- */

.ds-topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--ds-top-h);
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 24px;
  background: var(--ds-bg);
  border-bottom: 1px solid var(--ds-border);
}

.ds-logo { display: flex; align-items: center; gap: 8px; font-size: 17px; font-weight: 700; white-space: nowrap; }
.ds-logo-mark { display: inline-flex; color: var(--ds-accent); }
.ds-logo-suffix { color: var(--ds-accent); font-weight: 600; }

.ds-search-trigger {
  flex: 1;
  max-width: 380px;
  height: 42px;
  margin-left: 10px;
  padding: 0 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--ds-border);
  border-radius: 10px;
  background: var(--ds-bg);
  color: var(--ds-muted);
  font-size: 14px;
  text-align: left;
}

.ds-search-trigger span { flex: 1; }

.ds-search-trigger kbd {
  padding: 2px 8px;
  border: 1px solid var(--ds-border);
  border-radius: 6px;
  background: var(--ds-bg-alt);
  font: 12px ui-monospace, SFMono-Regular, Menlo, monospace;
}

.ds-nav { display: flex; gap: 26px; margin-left: auto; padding-right: 8px; }
.ds-nav a { font-size: 15px; color: var(--ds-muted); }
.ds-nav a:hover, .ds-nav a.is-current { color: var(--ds-text); }

.ds-icon-btn {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--ds-border);
  border-radius: 10px;
  background: var(--ds-bg);
}
.ds-icon-btn:hover { background: var(--ds-bg-alt); }
.ds-menu-toggle { display: none; }

.ds-lang {
  height: 42px;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--ds-border);
  border-radius: 10px;
  background: var(--ds-bg);
}
.ds-lang select { border: 0; background: transparent; font: inherit; font-size: 14px; color: var(--ds-text); cursor: pointer; }
.ds-lang select option { color: #0f172a; }
.ds-cta { height: 42px; }

/* ---------- layout ---------- */

.ds-body { display: flex; align-items: flex-start; }
.ds-main { flex: 1; min-width: 0; padding: 48px 56px 96px 64px; }
.ds-overlay { display: none; }

/* ---------- sidebar ---------- */

.ds-sidebar {
  position: sticky;
  top: var(--ds-top-h);
  flex: 0 0 var(--ds-side-w);
  width: var(--ds-side-w);
  height: calc(100vh - var(--ds-top-h));
  display: flex;
  flex-direction: column;
  background: var(--ds-bg);
  border-right: 1px solid var(--ds-border);
}

.ds-sidebar-scroll { flex: 1; overflow-y: auto; padding: 24px 12px 16px 16px; }

.ds-side-title {
  margin: 0 0 12px;
  padding: 0 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ds-muted);
}

.ds-side-help {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 16px;
  border-top: 1px solid var(--ds-border);
  font-size: 13px;
  color: var(--ds-muted);
}
.ds-side-help strong { font-size: 15px; color: var(--ds-text); }
.ds-side-help .ds-btn { margin-top: 8px; }

.ds-tree, .ds-tree-children { list-style: none; margin: 0; padding: 0; }

.ds-tree-children {
  display: none;
  margin-left: 14px;
  padding-left: 8px;
  border-left: 1px solid var(--ds-border);
}
.ds-tree-item.ds-open > .ds-tree-children { display: block; }

.ds-tree-row { display: flex; align-items: center; margin: 1px 0; border-radius: 8px; }
.ds-tree-row:hover { background: var(--ds-bg-alt); }
.ds-tree-row.ds-active { background: var(--ds-accent-bg); }

.ds-tree-link {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 1px 10px 5px 24px;
  font-size: 15px;
  color: var(--ds-muted);
}
.ds-tree-row:hover .ds-tree-link { color: var(--ds-text); }
.ds-tree-row.ds-active .ds-tree-link { color: var(--ds-accent); font-weight: 600; }
.ds-tree-label { flex: 1; }

.ds-tree-caret {
  display: inline-flex;
  padding: 8px;
  border: 0;
  background: none;
  color: var(--ds-muted);
  transition: transform 0.15s ease;
}
.ds-tree-item.ds-open > .ds-tree-row .ds-tree-caret { transform: rotate(90deg); }

/* ---------- home ---------- */

.ds-home { display: flex; align-items: flex-start; gap: 48px; }
.ds-home-main { flex: 1; min-width: 0; }

.ds-pill {
  display: inline-block;
  padding: 10px 18px;
  border: 1px solid var(--ds-accent-line);
  border-radius: 999px;
  background: var(--ds-accent-bg);
  color: var(--ds-accent);
  font-size: 15px;
  font-weight: 500;
}

.ds-home-title {
  margin: 44px 0 0;
  font-size: clamp(40px, 5vw, 60px);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.ds-home-sub { max-width: 620px; margin: 32px 0 0; font-size: 20px; line-height: 1.6; color: var(--ds-muted); }
.ds-home-h2 { margin: 56px 0 24px; font-size: 24px; font-weight: 700; letter-spacing: -0.01em; }

.ds-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 340px)); gap: 20px; }

.ds-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 28px 30px;
  border: 1px solid var(--ds-border);
  border-radius: 18px;
  background: var(--ds-bg);
  transition: border-color 0.15s ease;
}
.ds-card:hover { border-color: var(--ds-accent); }

.ds-card-icon, .ds-promo-icon {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
}
.ds-card-icon { background: var(--ds-accent-bg); color: var(--ds-accent); }
.ds-card-title { font-size: 19px; font-weight: 600; }
.ds-card-foot { display: flex; justify-content: space-between; gap: 12px; font-size: 15px; color: var(--ds-muted); }

.ds-promo {
  flex: 0 0 340px;
  padding: 32px;
  border: 1px solid var(--ds-border);
  border-radius: 18px;
  background: radial-gradient(circle at 100% 0%, var(--ds-accent-bg), transparent 55%), var(--ds-bg);
}
.ds-promo-icon { background: var(--ds-amber-bg); color: var(--ds-amber); }
.ds-promo h3 { margin: 22px 0 14px; font-size: 22px; line-height: 1.35; font-weight: 700; }
.ds-promo p { margin: 0 0 26px; font-size: 16px; line-height: 1.6; color: var(--ds-muted); }

/* ---------- doc page ---------- */

.ds-doc-wrap { display: flex; align-items: flex-start; gap: 48px; }
.ds-article { flex: 1; min-width: 0; max-width: 780px; }
.ds-doc-title { margin: 0 0 24px; font-size: 38px; line-height: 1.15; font-weight: 800; letter-spacing: -0.02em; }
.ds-state { max-width: 560px; padding: 24px 0; }
.ds-state .ds-btn { margin-top: 12px; }

.ds-prose { font-size: 16px; line-height: 1.75; }
.ds-prose h2 { margin: 40px 0 12px; font-size: 25px; letter-spacing: -0.01em; scroll-margin-top: calc(var(--ds-top-h) + 16px); }
.ds-prose h3 { margin: 28px 0 10px; font-size: 19px; scroll-margin-top: calc(var(--ds-top-h) + 16px); }
.ds-prose p { margin: 0 0 16px; }
.ds-prose a { color: var(--ds-accent); text-decoration: underline; text-underline-offset: 3px; }
.ds-prose img { max-width: 100%; height: auto; border-radius: 10px; }
.ds-prose ul, .ds-prose ol { margin: 0 0 16px; padding-left: 24px; }

.ds-prose pre {
  overflow-x: auto;
  padding: 16px;
  border: 1px solid var(--ds-border);
  border-radius: 10px;
  background: var(--ds-bg-alt);
  font-size: 13.5px;
  line-height: 1.6;
}
.ds-prose code { padding: 2px 6px; border-radius: 6px; background: var(--ds-bg-alt); font-size: 0.9em; }
.ds-prose pre code { padding: 0; background: none; }
.ds-prose blockquote { margin: 16px 0; padding: 4px 18px; border-left: 3px solid var(--ds-accent); color: var(--ds-muted); }
.ds-prose table { display: block; overflow-x: auto; margin: 18px 0; border-collapse: collapse; font-size: 14.5px; }
.ds-prose th, .ds-prose td { padding: 9px 12px; border: 1px solid var(--ds-border); text-align: left; }
.ds-prose th { background: var(--ds-bg-alt); }

/* ---------- "On this page" ---------- */

.ds-toc { position: sticky; top: calc(var(--ds-top-h) + 32px); flex: 0 0 210px; font-size: 14px; }
.ds-toc:empty { display: none; }
.ds-toc ul { list-style: none; margin: 0; padding: 0; }
.ds-toc a { display: block; padding: 5px 0 5px 12px; border-left: 2px solid var(--ds-border); color: var(--ds-muted); }
.ds-toc li.is-sub a { padding-left: 26px; font-size: 13px; }
.ds-toc a:hover { color: var(--ds-text); }
.ds-toc a.is-active { color: var(--ds-accent); border-left-color: var(--ds-accent); }

/* ---------- search modal ---------- */

.ds-modal { display: none; position: fixed; inset: 0; z-index: 100; padding: 12vh 16px 0; background: rgba(15, 23, 42, 0.5); }
.ds-modal.ds-open { display: block; }

.ds-modal-box {
  max-width: 580px;
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid var(--ds-border);
  border-radius: 14px;
  background: var(--ds-bg);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.25);
}

.ds-modal-input { display: flex; align-items: center; gap: 10px; padding: 0 16px; border-bottom: 1px solid var(--ds-border); color: var(--ds-muted); }
.ds-modal-input input {
  flex: 1;
  padding: 18px 0;
  border: 0;
  outline: none;
  background: transparent;
  font: inherit;
  font-size: 16px;
  color: var(--ds-text);
}

.ds-modal-results { max-height: 50vh; overflow-y: auto; }

.ds-result { display: flex; flex-direction: column; gap: 2px; padding: 12px 16px; border-bottom: 1px solid var(--ds-border); }
.ds-result:last-child { border-bottom: 0; }
.ds-result.is-active, .ds-result:hover { background: var(--ds-accent-bg); }
.ds-result-title { font-size: 15px; font-weight: 600; }
.ds-result-path { font-size: 12.5px; color: var(--ds-muted); }
.ds-search-empty { padding: 24px 16px; text-align: center; font-size: 14px; color: var(--ds-muted); }

/* ---------- responsive ---------- */

@media (max-width: 1200px) {
  .ds-toc { display: none; }
  .ds-promo { flex-basis: 300px; }
}

@media (max-width: 1000px) {
  .ds-nav { display: none; }
  .ds-search-trigger { margin-left: auto; }
  .ds-home { flex-direction: column-reverse; }
  .ds-promo { flex: none; width: 100%; max-width: 420px; }
}

@media (max-width: 820px) {
  .ds-topbar { gap: 10px; padding: 0 14px; }
  .ds-menu-toggle { display: inline-flex; }
  .ds-cta, .ds-lang { display: none; }
  .ds-logo { margin-right: auto; }

  .ds-search-trigger { flex: none; width: 42px; max-width: none; padding: 0; justify-content: center; }
  .ds-search-trigger span, .ds-search-trigger kbd { display: none; }

  .ds-sidebar {
    position: fixed;
    top: var(--ds-top-h);
    left: 0;
    bottom: 0;
    z-index: 60;
    height: auto;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }
  body.ds-sidebar-open .ds-sidebar { transform: translateX(0); }

  .ds-overlay { position: fixed; inset: var(--ds-top-h) 0 0 0; z-index: 50; background: rgba(15, 23, 42, 0.4); }
  body.ds-sidebar-open .ds-overlay { display: block; }

  .ds-main { padding: 28px 18px 72px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}
.ds-logo-mark {
    width: 42px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ds-logo-image {
    width: 42px;
    height: 32px;
    object-fit: contain;
    display: block;
}

.ds-doc-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 36px;

  width: 100%;
  max-width: none;
  margin: 0;
  padding: 32px 40px;
  box-sizing: border-box;
  align-items: start;
}

.ds-article {
  min-width: 0;
  width: 100%;
  max-width: none;
}

.ds-toc {
  min-width: 0;
  width: 100%;
  position: sticky;
  top: 90px;
}

@media (max-width: 900px) {
  .ds-doc-wrap {
    grid-template-columns: minmax(0, 1fr);
    padding: 24px;
  }

  .ds-toc {
    display: none;
  }
}