* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: var(--c-white);
  color: var(--c-zinc-950);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
}
a { text-decoration: none; color: inherit; }

/* ── Header ── */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-zinc-200);
  padding: 0 32px; height: 54px;
  display: flex; align-items: center; justify-content: space-between;
}
.header-logo { font-size: 15px; font-weight: 700; color: var(--c-zinc-950); letter-spacing: -0.02em; }
.header-nav { display: flex; align-items: center; gap: 20px; }
.header-nav a { font-size: 13px; color: var(--c-zinc-500); transition: color 0.15s; }
.header-nav a:hover { color: var(--c-zinc-950); }

/* ── Layout ── */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 32px 80px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
}
.page-label {
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--c-zinc-400); font-weight: 600; margin-bottom: 12px;
}
.page-title {
  font-size: 30px; font-weight: 800; letter-spacing: -0.025em;
  color: var(--c-zinc-950); margin-bottom: 8px;
}
.page-lead {
  font-size: 14px; color: var(--c-zinc-500); margin-bottom: 28px; line-height: 1.7;
}

/* ── Sidebar (TOC) ── */
.toc {
  position: sticky; top: 78px;
  align-self: start;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  padding-right: 8px;
}
.toc-heading {
  font-size: 11px; font-weight: 700; color: var(--c-zinc-950);
  letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 10px;
}
.toc-list { list-style: none; }
.toc-list li { margin: 0; }
.toc-list a {
  display: block; font-size: 13px; color: var(--c-zinc-500);
  padding: 6px 10px; border-radius: 6px; line-height: 1.4;
  transition: background 0.12s, color 0.12s;
}
.toc-list a:hover { background: var(--c-zinc-100); color: var(--c-zinc-950); }
.toc-list a.active { background: var(--c-zinc-950); color: var(--c-white); }

/* ── Search ── */
.search-box {
  margin-bottom: 16px;
}
.search-field {
  position: relative;
}
.search-input {
  width: 100%;
  border: 1px solid var(--c-zinc-200);
  border-radius: 8px;
  padding: 9px 32px 9px 34px;
  font-size: 13px;
  font-family: inherit;
  outline: none;
  background: var(--c-white);
  transition: border-color 0.12s, box-shadow 0.12s;
  line-height: 20px;
}
.search-input:focus {
  border-color: var(--c-zinc-950);
  box-shadow: 0 0 0 3px rgba(9,9,11,0.06);
}
.search-icon {
  position: absolute; left: 11px; top: 50%; transform: translateY(-50%);
  width: 14px; height: 14px; color: var(--c-zinc-400); pointer-events: none;
}
.search-clear {
  position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  width: 22px; height: 22px; border: none; background: transparent;
  color: var(--c-zinc-400); cursor: pointer; border-radius: 4px; display: none;
  align-items: center; justify-content: center; font-size: 16px;
  line-height: 1; padding: 0;
}
.search-clear.show { display: flex; }
.search-clear:hover { background: var(--c-zinc-100); color: var(--c-zinc-950); }
.search-meta {
  font-size: 11px; color: var(--c-zinc-400); margin-top: 6px; min-height: 14px;
}

/* ── Content ── */
.content { min-width: 0; }
.section {
  scroll-margin-top: 78px;
  margin-top: 40px;
  padding-top: 4px;
}
.section:first-of-type { margin-top: 0; }
.section h2 {
  font-size: 22px; font-weight: 700; letter-spacing: -0.02em;
  color: var(--c-zinc-950); margin-bottom: 14px;
}
.section h3 {
  font-size: 15px; font-weight: 700; color: var(--c-zinc-950);
  margin: 24px 0 8px;
}
.section p, .section li {
  font-size: 14px; color: var(--c-zinc-700);
}
.section p { margin-bottom: 10px; }
.section ul, .section ol {
  padding-left: 22px; margin-bottom: 12px;
}
.section li { margin-bottom: 6px; }
.section strong { color: var(--c-zinc-950); font-weight: 700; }
.section code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px;
  background: var(--c-zinc-100);
  color: var(--c-zinc-950);
  padding: 1px 6px;
  border-radius: 4px;
}
.section .callout {
  border: 1px solid var(--c-zinc-200);
  background: var(--c-zinc-50);
  border-radius: 10px;
  padding: 14px 16px;
  margin: 14px 0;
  font-size: 13.5px;
  color: var(--c-zinc-700);
}
.section .callout strong { display: block; margin-bottom: 4px; color: var(--c-zinc-950); }
.section .kbd {
  display: inline-block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11.5px;
  padding: 1px 6px;
  background: var(--c-white);
  border: 1px solid var(--c-zinc-300);
  border-bottom-width: 2px;
  border-radius: 4px;
  color: var(--c-zinc-950);
}
.section .table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  margin: 8px 0 14px;
}
.section .table th, .section .table td {
  text-align: left; vertical-align: top;
  padding: 10px 12px; border-bottom: 1px solid var(--c-zinc-100);
}
.section .table th {
  width: 28%; font-weight: 600; color: var(--c-zinc-950); background: var(--c-zinc-50);
}
.section .table td { color: var(--c-zinc-700); }

/* ── Search highlight & filtered states ── */
mark.search-hit {
  background: #fef08a;
  color: var(--c-zinc-950);
  padding: 0 2px;
  border-radius: 2px;
}
.section.is-hidden { display: none; }
.toc-list li.is-hidden { display: none; }
.empty-state {
  margin-top: 24px;
  padding: 24px;
  border: 1px dashed var(--c-zinc-200);
  border-radius: 10px;
  color: var(--c-zinc-500);
  font-size: 13.5px;
  text-align: center;
  display: none;
}
.empty-state.show { display: block; }

@media (max-width: 880px) {
  .container { grid-template-columns: 1fr; gap: 24px; padding: 32px 20px 60px; }
  .toc { position: static; max-height: none; padding-right: 0; }
  .toc-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2px; }
  .page-title { font-size: 26px; }
}