:root {
  color-scheme: light;
  --bg: #f7f7f5;
  --paper: #ffffff;
  --paper-soft: #f1f1ee;
  --ink: #151515;
  --muted: #5f625e;
  --faint: #8f938d;
  --line: rgba(20, 20, 18, 0.1);
  --line-strong: rgba(20, 20, 18, 0.18);
  --accent: #3a8fc2;
  --accent-soft: rgba(58, 143, 194, 0.1);
  --shadow: 0 24px 70px rgba(29, 31, 28, 0.08);
  --serif: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
  --sans: "Inter", "Avenir Next", "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #10110f;
  --paper: #171815;
  --paper-soft: #20211d;
  --ink: #edeee8;
  --muted: #a4a79d;
  --faint: #73776d;
  --line: rgba(237, 238, 232, 0.1);
  --line-strong: rgba(237, 238, 232, 0.18);
  --accent: #7cc4e8;
  --accent-soft: rgba(124, 196, 232, 0.12);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; min-height: 100vh; overflow-x: hidden;
  background: var(--bg);
  color: var(--ink); font-family: var(--sans); font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { cursor: pointer; }

/* ── Site: rail + content ── */
.site {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  grid-template-rows: auto 1fr;
}

/* ── Rail (full height) ── */
.rail {
  grid-column: 1; grid-row: 1 / -1;
  position: sticky; top: 0; z-index: 10;
  padding: 28px 0;
  display: flex; flex-direction: column; align-items: center;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(20px);
}
.rail-mark {
  width: 42px; height: 42px;
  border: 1px solid var(--line-strong); border-radius: 50%;
  display: grid; place-items: center;
  background: var(--paper); color: var(--ink);
  font-family: var(--serif); font-size: 20px;
  transition: border-color 160ms;
}
.rail-mark:hover { border-color: var(--accent); }
.rail-nav {
  margin-top: 32px;
  display: flex; flex-direction: column; gap: 10px;
}
.rail-nav a, .rail-action {
  position: relative; width: 42px; height: 42px;
  border: 1px solid transparent;
  display: grid; place-items: center;
  background: transparent; color: var(--faint);
  transition: color 160ms, background 160ms, border-color 160ms;
}
.rail-nav a:hover, .rail-action:hover {
  color: var(--ink); background: var(--paper); border-color: var(--line);
}
.rail-nav svg, .rail-action svg {
  width: 18px; height: 18px; fill: none; stroke: currentColor;
  stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
}
.rail-nav span, .rail-action span {
  position: absolute; left: 50px; top: 50%; transform: translateY(-50%);
  padding: 6px 10px; border: 1px solid var(--line);
  background: var(--paper); color: var(--muted);
  font-size: 12px; white-space: nowrap;
  opacity: 0; pointer-events: none; box-shadow: var(--shadow);
  transition: opacity 160ms;
}
.rail-nav a:hover span, .rail-action:hover span { opacity: 1; }

/* ── Theme pull-cord ── */
.theme-pull {
  position: fixed; top: 0; right: 12px; z-index: 60;
  width: 42px; height: 86px; border: 0; padding: 0;
  display: grid; justify-items: center; align-content: start;
  background: transparent;
  appearance: none;
  cursor: pointer;
  pointer-events: auto;
}
.theme-pull * { pointer-events: none; }
.pull-cord { width: 1px; height: 56px; background: color-mix(in srgb, var(--ink) 36%, transparent); }
.pull-knob {
  width: 20px; height: 20px;
  border: 1px solid var(--line-strong); border-radius: 50%;
  background: var(--paper);
  transition: transform 180ms, border-color 180ms;
}
.theme-pull:hover .pull-knob { transform: translateY(3px); border-color: var(--accent); }

/* ── Mobile ── */
.mobile-top { display: none; }
.mobile-actions { display: flex; align-items: center; gap: 8px; }
.mobile-search, .mobile-admin {
  min-height: 36px; border: 1px solid var(--line-strong);
  padding: 0 12px; font-size: 12px;
  letter-spacing: 0.04em; text-transform: uppercase;
}
.mobile-search { background: var(--paper); color: var(--ink); }
.mobile-admin { background: transparent; color: var(--muted); display: grid; place-items: center; }

.content {
  grid-column: 2; grid-row: 1;
  position: relative;
  --pad-x: clamp(18px, 2.8vw, 42px);
  min-width: 0;
  padding: 0 var(--pad-x);
  border-left: 1px solid var(--line);
  background:
    radial-gradient(circle at 70% 6%, var(--accent-soft), transparent 20rem),
    linear-gradient(180deg, var(--paper-soft), var(--bg) 16rem);
}
.content::after {
  content: "";
  position: absolute;
  bottom: 0; left: -74px; right: 0;
  height: 1px;
  background: var(--line-strong);
  z-index: 11;
}

/* ── Hero ── */
.hero {
  position: relative; overflow: hidden;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  box-shadow: var(--shadow);
  margin-top: clamp(12px, 1.6vw, 20px);
}
.hero-cover {
  position: absolute; inset: 0; overflow: hidden;
  background:
    linear-gradient(130deg, rgba(58, 143, 194, 0.12), transparent 38%),
    var(--paper-soft);
}
.cover-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 34px 34px; opacity: 0.42;
}
.cover-line { display: none; }
.cover-stamp {
  position: absolute; left: 20px; top: 14px;
  padding: 4px 7px; border: 1px solid var(--line-strong);
  background: color-mix(in srgb, var(--paper) 78%, transparent);
  color: var(--muted); font-family: var(--mono);
  font-size: 9px; text-transform: uppercase;
}
.cover-signal {
  position: absolute; right: 5%; top: 10%;
  width: 76px; height: 76px;
  border: 1px solid var(--line-strong); border-radius: 50%;
}
.cover-signal::before, .cover-signal::after {
  content: ""; position: absolute; inset: 18px;
  border: 1px solid var(--line); border-radius: 50%;
}
.cover-signal::after { inset: 32px; background: color-mix(in srgb, var(--ink) 24%, transparent); }

.hero-body {
  position: relative; z-index: 1;
  display: flex; align-items: center; gap: clamp(14px, 1.8vw, 24px);
  padding: clamp(20px, 2.4vw, 32px) clamp(24px, 2.6vw, 38px);
}
.avatar-wrap {
  flex-shrink: 0; width: 68px; height: 68px;
  border: 1px solid var(--line-strong);
  display: grid; place-items: center; background: var(--paper);
}
.avatar-mark {
  width: 44px; height: 44px; border: 1px solid var(--line);
  display: grid; place-items: center;
  font-family: var(--serif); font-size: 19px;
}
.hero-text { min-width: 0; }
.identity-kicker, .section-code {
  margin: 0 0 3px; color: var(--faint);
  font-family: var(--mono); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.06em;
}
.hero-text h1 {
  margin: 0; font-family: var(--serif);
  font-size: clamp(20px, 2.4vw, 30px);
  font-weight: 400; line-height: 1.15;
}
.identity-copy {
  margin: 5px 0 0; color: var(--muted);
  font-size: 12px; line-height: 1.6; max-width: 52ch;
}

/* ── Search (inside hero, bottom) ── */
.hero-search-wrap {
  position: relative; z-index: 1;
  display: flex; justify-content: center;
  padding: 0 clamp(24px, 2.6vw, 38px) clamp(14px, 1.6vw, 20px);
}
.hero-search {
  width: min(100%, 580px);
  display: grid; grid-template-columns: minmax(0, 1fr) auto auto;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}
.hero-search .search-field { min-width: 0; }
.hero-search .search-field input {
  width: 100%; height: 40px; border: 0; outline: 0;
  padding: 0 14px; background: transparent;
  color: var(--ink); font-size: 13px;
}
.hero-search .search-field input::placeholder { color: var(--faint); }
.search-btn {
  border: 0; border-left: 1px solid var(--line);
  padding: 0 16px; font-size: 12px;
  transition: background 160ms, color 160ms;
}
.search-btn-site { background: var(--paper-soft); color: var(--ink); }
.search-btn-site:hover { background: var(--accent-soft); color: var(--accent); }
.search-btn-web { background: var(--accent); color: var(--paper); }
.search-btn-web:hover { background: color-mix(in srgb, var(--accent) 80%, var(--ink)); }

/* ══════════════════════════════
   Desk: sidebar + cards
   Below the search, inside content
   ══════════════════════════════ */
.desk {
  grid-column: 1 / -1; grid-row: 2;
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  min-height: 50vh;
}

.desk-sidebar {
  position: sticky; top: 0; align-self: start;
  border-right: 0;
  padding: 16px 0;
}
.cat-link {
  width: 100%; min-height: 34px; border: 0;
  background: transparent; color: var(--muted);
  padding: 6px 16px;
  display: flex; align-items: center; gap: 7px;
  text-align: left; font-size: 13px;
  transition: color 160ms, background 160ms;
}
.cat-link:hover { color: var(--ink); background: var(--accent-soft); }
.cat-link.is-active {
  color: var(--accent); font-weight: 600;
  background: var(--accent-soft);
  box-shadow: inset 3px 0 0 var(--accent);
}
.cat-link svg {
  width: 14px; height: 14px; flex-shrink: 0;
  fill: none; stroke: currentColor;
  stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round;
}

.desk-cards {
  padding: 20px clamp(18px, 2.4vw, 32px);
}

/* ── Card grid ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(156px, 1fr));
  gap: 8px;
}
.nav-card {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 12px;
  display: flex; align-items: center; gap: 10px;
  transition: border-color 160ms, box-shadow 160ms, transform 160ms;
}
.nav-card:hover {
  border-color: var(--accent);
  box-shadow: 0 6px 22px rgba(0, 0, 0, 0.06);
  transform: translateY(-1px);
}
.card-icon {
  width: 32px; height: 32px; flex-shrink: 0;
  border: 1px solid var(--line-strong); border-radius: 50%;
  display: grid; place-items: center;
  background: var(--paper-soft); color: var(--accent);
  font-family: var(--serif); font-size: 15px;
  transition: background 160ms;
}
.nav-card:hover .card-icon { background: var(--paper); }
.card-copy { min-width: 0; }
.card-copy strong {
  display: block; font-size: 13px; font-weight: 600; line-height: 1.3;
  overflow: hidden; white-space: nowrap; text-overflow: ellipsis;
}
.card-copy small {
  display: block; color: var(--muted); font-size: 11px; line-height: 1.35;
  overflow: hidden; white-space: nowrap; text-overflow: ellipsis;
}
.empty-state {
  grid-column: 1 / -1;
  border: 1px dashed var(--line-strong); padding: 18px;
  color: var(--muted);
}

/* ── Search dialog ── */
.search-dialog[hidden] { display: none; }
.search-dialog {
  position: fixed; inset: 0; z-index: 40;
  display: grid; place-items: start center; padding: 9vh 24px 24px;
}
.search-backdrop {
  position: absolute; inset: 0;
  background: rgba(12, 13, 12, 0.36); backdrop-filter: blur(6px);
}
.search-panel {
  position: relative; z-index: 1; width: min(680px, 100%);
  max-height: 82vh; overflow: auto;
  border: 1px solid var(--line-strong); background: var(--paper);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.2); padding: 24px;
}
.search-head {
  display: flex; justify-content: space-between;
  align-items: start; gap: 18px; margin-bottom: 18px;
}
.search-head h2 { margin: 0; font-family: var(--serif); font-size: 30px; font-weight: 400; }
.search-close {
  border: 1px solid var(--line-strong); background: transparent;
  color: var(--ink); padding: 8px 12px; font-size: 12px;
  letter-spacing: 0.04em; text-transform: uppercase;
}
.search-box { display: grid; gap: 8px; margin-bottom: 18px; }
.search-box span { color: var(--faint); font-family: var(--mono); font-size: 12px; text-transform: uppercase; }
.search-box input {
  width: 100%; border: 0; border-bottom: 1px solid var(--line-strong);
  border-radius: 0; padding: 10px 0; outline: 0;
  background: transparent; color: var(--ink); font-size: 16px;
}
.search-box input:focus { border-color: var(--accent); }
.search-results { display: grid; }
.search-result {
  display: grid; grid-template-columns: 76px minmax(0, 1fr);
  gap: 6px 14px; align-items: baseline;
  border-top: 1px solid var(--line); padding: 14px 0;
  transition: color 160ms;
}
.search-result:hover { color: var(--accent); }
.search-result span { color: var(--accent); font-family: var(--mono); font-size: 12px; text-transform: uppercase; }
.search-result strong { font-family: var(--serif); font-size: 18px; font-weight: 400; }
.search-result small { grid-column: 2; color: var(--faint); line-height: 1.5; }
.empty-result { margin: 0; color: var(--muted); padding: 18px 0; }

/* ── Utilities ── */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}

@media (max-width: 980px) {
  .card-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
}

@media (max-width: 760px) {
  .site { display: block; }
  .rail, .theme-pull { display: none; }
  .mobile-top {
    position: sticky; top: 0; z-index: 20;
    display: flex; align-items: center;
    gap: 12px; padding: 10px 16px;
    border-bottom: 1px solid var(--line);
    background: color-mix(in srgb, var(--bg) 92%, transparent);
    backdrop-filter: blur(18px);
  }
  .mobile-top > a { font-family: var(--serif); font-size: 17px; }
  .mobile-actions { margin-left: auto; }
  .content { padding: 0 16px; }
  .hero { min-height: 110px; margin-top: 12px; }
  .hero-body { padding: 16px 18px; gap: 10px; }
  .avatar-wrap { width: 48px; height: 48px; }
  .avatar-mark { width: 32px; height: 32px; font-size: 14px; }
  .hero-text h1 { font-size: 18px; }
  .identity-copy { font-size: 11px; }
  .cover-line-b, .cover-signal { display: none; }
  .search-section { padding: 12px 0; }
  .hero-search { width: 100%; }
  .search-btn { padding: 0 10px; font-size: 11px; }
  .desk { grid-template-columns: 1fr; }
  .desk-sidebar {
    position: static; border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 8px 12px;
    display: flex; flex-wrap: wrap; gap: 6px;
  }
  .cat-link {
    min-height: 30px; padding: 4px 12px;
    font-size: 12px; box-shadow: none !important;
  }
  .cat-link.is-active { background: var(--accent); color: var(--paper); }
  .desk-cards { padding: 14px 0; }
  .card-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .nav-card { padding: 10px; gap: 8px; }
  .card-icon { width: 28px; height: 28px; font-size: 13px; }
  .card-copy strong { font-size: 12px; }
  .card-copy small { font-size: 10px; }
}