:root {
  --paper: oklch(0.975 0.008 80);
  --ink: oklch(0.22 0.01 60);
  --ink-2: oklch(0.48 0.012 60);
  --rule: oklch(0.86 0.012 70);
  --hover: oklch(0.945 0.014 75);
  --accent: oklch(0.6 0.19 35);
  /* 结果色：计算结果、可复制的值（规则见 tools/DESIGN.md） */
  --result: oklch(0.52 0.2 262);
  --result-hover: oklch(0.44 0.2 262);
  --ok: oklch(0.55 0.15 150);
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: oklch(0.18 0.008 60);
    --ink: oklch(0.93 0.01 80);
    --ink-2: oklch(0.68 0.012 70);
    --rule: oklch(0.32 0.01 60);
    --hover: oklch(0.225 0.01 60);
    --accent: oklch(0.7 0.17 38);
    --result: oklch(0.74 0.14 255);
    --result-hover: oklch(0.82 0.11 255);
    --ok: oklch(0.75 0.15 150);
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font: 15px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
::selection { background: var(--accent); color: var(--paper); }

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: clamp(40px, 9vh, 96px) clamp(16px, 5vw, 48px) 40px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ---------- masthead ---------- */
.kicker {
  margin: 0;
  font: 500 13px/1 var(--mono);
  color: var(--ink-2);
  letter-spacing: .02em;
}
.kicker a { text-decoration: none; }
.kicker a:hover { color: var(--accent); }
.kicker .sep { color: var(--accent); margin: 0 4px; }

.mark {
  margin: 18px 0 0;
  font: 700 clamp(64px, 12vw, 128px)/0.9 var(--mono);
  letter-spacing: -0.06em;
  display: flex;
  align-items: flex-end;
}
.mark .slash { color: var(--accent); }
.caret {
  display: inline-block;
  width: 0.08em;
  height: 0.78em;
  margin-left: 0.08em;
  margin-bottom: 0.04em;
  background: var(--ink);
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.lede {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: 16px;
  color: var(--ink-2);
}

/* ---------- index ---------- */
.index { margin-top: clamp(48px, 10vh, 96px); }
.index-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink);
}
.index-head h2 {
  margin: 0;
  font: 600 12px/1 var(--mono);
  letter-spacing: .18em;
}
.tally { font: 12px/1 var(--mono); color: var(--ink-2); }

.page.wide { max-width: 1280px; }
.mark.small { font-size: clamp(52px, 10vw, 96px); }

/* ---------- 首页：搜索 ---------- */
.search { margin-top: clamp(32px, 6vh, 56px); }
.search-box {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 4px 12px;
  border-bottom: 2px solid var(--ink);
  cursor: text;
}
.search-box .prompt { font: 700 28px/1 var(--mono); color: var(--accent); }
.search-box input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--ink);
  font: 500 clamp(18px, 2.4vw, 24px)/1.3 var(--mono);
  padding: 6px 0;
}
.search-box input::placeholder { color: var(--ink-2); opacity: .6; }
.search-box input::-webkit-search-cancel-button { display: none; }
.search-box:focus-within { border-bottom-color: var(--accent); }

/* ---------- 首页：分类目录 ---------- */
.catalog {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(320px, 100%), 1fr));
  gap: 40px 40px;
  margin-top: 40px;
}
.cat-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--ink);
}
.cat-head h2 { margin: 0; font: 600 12px/1 var(--mono); letter-spacing: .14em; }
.cat-count { font: 12px/1 var(--mono); color: var(--ink-2); }

.item {
  display: grid;
  grid-template-columns: 34px 1fr 20px;
  align-items: center;
  gap: 10px;
  padding: 12px 6px;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  transition: background-color .2s var(--ease), transform .12s var(--ease);
}
.item:hover { background: var(--hover); }
.item:active { transform: scale(0.99); }
.item:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.item .no { font: 500 12px/1 var(--mono); color: var(--ink-2); transition: color .2s var(--ease); }
.item .body { min-width: 0; }
.item .name { display: block; font-size: 16px; font-weight: 600; line-height: 1.3; }
.item .desc {
  display: block;
  margin-top: 2px;
  font-size: 12.5px;
  color: var(--ink-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.item .go {
  font: 16px/1 var(--mono);
  color: var(--ink-2);
  opacity: 0;
  transition: transform .35s var(--ease), opacity .2s var(--ease), color .2s var(--ease);
}
.item:hover .no, .item:hover .go { color: var(--accent); }
.item:hover .go { opacity: 1; transform: translateX(4px); }
.empty { margin: 40px 0 0; font: 14px var(--mono); color: var(--ink-2); }

/* ---------- footer ---------- */
.foot {
  margin-top: auto;
  padding-top: 64px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font: 12px/1 var(--mono);
  color: var(--ink-2);
}

@media (max-width: 560px) {
  .foot { flex-direction: column; gap: 8px; }
  .item .go { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .caret { animation: none; }
  .item, .item .go, .item .no { transition: none; }
}