/* ============ 设计变量（与时间轴视图 stage.css 统一） ============ */
:root {
  --bg: #ecebe8;
  --bg-2: #e2e1dd;
  --card: #ffffff;
  --ink: #141414;
  --ink-2: #555;
  --ink-3: #8a8a8a;
  --line: #d4d3cf;
  --edge: #1a1a1a;     /* 卡片描边 */
  --spine: #1a1a1a;
  --accent: #1f9d74;
  --grid: rgba(0, 0, 0, .055);

  --paper: #2f6bd8;   /* 论文 */
  --closed: #141414;  /* 闭源 */
  --open: #1f9d74;    /* 开源 */
  --infra: #c77a12;   /* 工具/协议 */
  --event: #c2410c;   /* 事件 */

  --sans: "Inter", "Noto Sans SC", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --serif: var(--sans);
  --mono: "Site Mono", ui-monospace, Consolas, monospace;
  --shadow: 0 0 0 5px var(--card), 0 0 0 7px var(--edge), 0 16px 26px -18px rgba(0,0,0,.35);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111213; --bg-2: #1b1c1e; --card: #1f2023; --ink: #f1f1ee; --ink-2: #b4b4b0; --ink-3: #7c7c78;
    --line: #333; --edge: #e8e8e4; --spine: #e8e8e4; --accent: #3cc79a; --grid: rgba(255,255,255,.05);
    --paper: #6a9bff; --closed: #f1f1ee; --open: #3cc79a; --infra: #f0a23a; --event: #fb8a5c;
  }
}
:root[data-theme="dark"] {
  --bg: #111213; --bg-2: #1b1c1e; --card: #1f2023; --ink: #f1f1ee; --ink-2: #b4b4b0; --ink-3: #7c7c78;
  --line: #333; --edge: #e8e8e4; --spine: #e8e8e4; --accent: #3cc79a; --grid: rgba(255,255,255,.05);
  --paper: #6a9bff; --closed: #f1f1ee; --open: #3cc79a; --infra: #f0a23a; --event: #fb8a5c;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 150px; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.7 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
code { font-family: var(--mono); font-size: .9em; background: var(--bg-2); padding: 1px 6px; border-radius: 4px; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ============ Hero ============ */
.hero {
  position: relative; border-bottom: 1px solid var(--line);
  background:
    radial-gradient(1200px 400px at 85% -10%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 70%),
    var(--bg);
}
.hero-inner { max-width: 1080px; margin: 0 auto; padding: 28px 24px 56px; }
.tracks { display: flex; gap: 6px; margin-bottom: 64px; }
.track {
  font-size: 14px; padding: 6px 14px; border-radius: 999px; text-decoration: none;
  border: 1px solid var(--line); color: var(--ink-2);
}
.track.is-active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.track.is-soon { opacity: .6; cursor: default; }
.track small { font-size: 11px; margin-left: 4px; }
.kicker { font-family: var(--mono); font-size: 13px; letter-spacing: .12em; color: var(--accent); margin: 0 0 12px; }
.hero h1 {
  font-family: var(--serif); font-weight: 900; font-size: clamp(44px, 8vw, 96px);
  line-height: 1.02; margin: 0 0 24px; letter-spacing: -.01em;
}
.hero h1 span { color: var(--ink-3); font-weight: 700; }
.lede { font-size: 18px; color: var(--ink-2); max-width: 36em; margin: 0 0 40px; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 40px; margin: 0; }
.hero-stats div { border-left: 2px solid var(--ink); padding-left: 14px; }
.hero-stats dt { font-size: 13px; color: var(--ink-3); }
.hero-stats dd { margin: 0; font-family: var(--serif); font-size: 30px; font-weight: 700; line-height: 1.2; }
.theme-toggle {
  position: absolute; top: 24px; right: 24px; width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid var(--line); background: var(--card); color: var(--ink); font-size: 18px; cursor: pointer;
}

/* ============ 工具栏 ============ */
.toolbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.toolbar-inner { max-width: 1080px; margin: 0 auto; padding: 10px 24px; display: grid; gap: 8px; }
.era-nav { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.era-nav::-webkit-scrollbar { display: none; }
.era-link {
  flex: none; font-size: 13px; padding: 4px 10px; border-radius: 6px; text-decoration: none;
  color: var(--ink-2); white-space: nowrap;
}
.era-link b { font-family: var(--mono); font-weight: 600; color: var(--ink-3); margin-right: 6px; font-size: 11px; }
.era-link:hover { background: var(--bg-2); }
.era-link.is-current { background: var(--ink); color: var(--bg); }
.era-link.is-current b { color: inherit; opacity: .7; }
.filters { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; justify-content: space-between; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font: 13px var(--sans); padding: 4px 12px 4px 10px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line); background: var(--card); color: var(--ink-2);
  display: inline-flex; align-items: center; gap: 6px;
}
.chip i { width: 8px; height: 8px; border-radius: 50%; background: var(--c); }
.chip[aria-pressed="false"] { opacity: .45; text-decoration: line-through; }
.chip .n { font-family: var(--mono); font-size: 11px; color: var(--ink-3); }
.search input {
  width: 240px; max-width: 100%; font: 14px var(--sans); color: var(--ink);
  padding: 6px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--card);
}
.search input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.progress { height: 2px; background: var(--accent); width: 0; transition: width .1s linear; }

/* ============ 时间线 ============ */
.timeline { max-width: 1080px; margin: 0 auto; padding: 24px 24px 80px; }
.era { padding-top: 56px; }
.era-head { display: grid; grid-template-columns: 140px 1fr; gap: 0 32px; margin-bottom: 28px; align-items: end; }
.era-no { font-family: var(--mono); font-size: 13px; color: var(--accent); letter-spacing: .1em; }
.era-no span { display: block; color: var(--ink-3); margin-top: 2px; }
.era-title h2 { font-family: var(--serif); font-size: clamp(30px, 4.5vw, 48px); font-weight: 900; margin: 0; line-height: 1.15; }
.era-title p { margin: 6px 0 0; color: var(--ink-2); font-size: 16px; }

.items { list-style: none; margin: 0; padding: 0; position: relative; }
.items::before {
  content: ""; position: absolute; left: 140px; top: 0; bottom: 0; width: 2px;
  background: var(--spine); transform: translateX(15px);
}
.item { display: grid; grid-template-columns: 140px 1fr; gap: 0 32px; position: relative; padding-bottom: 18px; }
.item-date { text-align: right; padding-top: 18px; font-family: var(--mono); }
.item-date .y { display: block; font-size: 20px; font-weight: 600; line-height: 1.1; }
.item-date .md { font-size: 13px; color: var(--ink-3); }
.item::after {
  content: ""; position: absolute; left: 140px; top: 24px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg); border: 3px solid var(--c); transform: translateX(9px);
}
.item.is-major::after { background: var(--c); width: 18px; height: 18px; transform: translateX(7px); top: 22px; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 20px; box-shadow: var(--shadow); position: relative;
  transition: border-color .2s, transform .2s;
  border-left: 3px solid var(--c);
}
.card:hover { border-color: var(--c); }
.item.is-flash .card { animation: flash 1.6s ease; }
@keyframes flash { 0%,40% { box-shadow: 0 0 0 4px color-mix(in srgb, var(--c) 35%, transparent); } 100% { box-shadow: var(--shadow); } }

.meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 12px; margin-bottom: 4px; }
.badge { color: var(--c); font-weight: 600; letter-spacing: .04em; }
.org { color: var(--ink-3); }
.org::before { content: "·"; margin-right: 8px; }
.card h3 { font-family: var(--serif); font-size: 21px; font-weight: 700; margin: 0 0 6px; line-height: 1.35; }
.card h3 a { text-decoration: none; }
.card h3 a:hover { text-decoration: underline; text-underline-offset: 3px; }
.summary { margin: 0; color: var(--ink-2); }

.row { display: flex; gap: 20px; align-items: flex-start; }
.row .text { flex: 1; min-width: 0; }
.stat { flex: none; max-width: 170px; text-align: right; padding-top: 18px; }
.stat b { display: block; font-family: var(--serif); font-size: 26px; font-weight: 900; color: var(--c); line-height: 1.1; }
.stat small { display: block; font-size: 12px; color: var(--ink-3); line-height: 1.4; margin-top: 4px; }

.more {
  margin-top: 10px; font: 13px var(--sans); color: var(--ink-3); background: none; border: 0;
  padding: 2px 0; cursor: pointer;
}
.more:hover { color: var(--ink); }
.detail { display: grid; gap: 10px; margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--line); }
.detail[hidden] { display: none; }
.detail h4 { font-size: 12px; color: var(--ink-3); margin: 0 0 2px; letter-spacing: .08em; font-weight: 600; }
.detail p { margin: 0; font-size: 15px; }
.detail .cost p { color: var(--ink-2); }
.links { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; font-size: 13px; }
.links .lbl { color: var(--ink-3); margin-right: 2px; }
.jump {
  font: 13px var(--sans); border: 1px solid var(--line); background: var(--bg); color: var(--ink);
  border-radius: 6px; padding: 2px 8px; cursor: pointer; text-decoration: none;
}
.jump:hover { border-color: var(--ink); }
.ext { color: var(--accent); text-decoration: none; font-size: 13px; }
.ext:hover { text-decoration: underline; }

.empty { text-align: center; color: var(--ink-3); padding: 40px 24px; }
.footer { border-top: 1px solid var(--line); text-align: center; color: var(--ink-3); font-size: 13px; padding: 32px 24px 48px; }
.footer p { margin: 4px 0; }

[data-type="paper"]  { --c: var(--paper); }
[data-type="closed"] { --c: var(--closed); }
[data-type="open"]   { --c: var(--open); }
[data-type="infra"]  { --c: var(--infra); }

/* ============ 手机 ============ */
@media (max-width: 720px) {
  html { scroll-padding-top: 170px; }
  .hero-inner { padding: 20px 16px 40px; }
  .tracks { margin-bottom: 40px; }
  .theme-toggle { top: 18px; right: 16px; }
  .hero-stats { gap: 20px 28px; }
  .hero-stats dd { font-size: 24px; }
  .toolbar-inner { padding: 8px 16px; }
  .search, .search input { width: 100%; }
  .chips { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; width: 100%; }
  .chips::-webkit-scrollbar { display: none; }
  .chip { flex: none; }
  .timeline { padding: 8px 16px 60px; }
  .era-head { grid-template-columns: 1fr; gap: 6px; }
  .items::before { left: 6px; transform: none; }
  .item { grid-template-columns: 1fr; padding-left: 28px; }
  .item::after { left: 0; top: 4px; transform: none; }
  .item.is-major::after { left: -2px; top: 2px; transform: none; }
  .item-date { text-align: left; padding: 0 0 6px; display: flex; gap: 8px; align-items: baseline; }
  .item-date .y { font-size: 16px; }
  .row { flex-direction: column; gap: 8px; }
  .stat { text-align: left; padding-top: 0; max-width: none; }
  .card { padding: 14px 16px; }
}

/* 英文模式 */

.lang-en .hero h1 { letter-spacing: -.02em; font-weight: 700; }
button.track { background: none; cursor: pointer; font: inherit; font-size: 14px; }

[data-type="event"]  { --c: var(--event); }
:root[data-theme="dark"] { --event: #fb8a5c; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --event: #fb8a5c; } }

/* 出处核实状态 */
.verify { margin: 0; padding: 6px 10px; border-radius: 6px; font-size: 13px; color: var(--ink-2); background: color-mix(in srgb, var(--infra) 12%, transparent); }
.verify::before { content: "⚠ "; color: var(--infra); }
.verify.is-secondary { background: var(--bg-2); }
.verify.is-secondary::before { content: "ⓘ "; color: var(--ink-3); }

/* 手机：筛选按钮横向滚动，搜索框占满一行，避免页面横向溢出 */
@media (max-width: 720px) {
  .toolbar-inner, .filters { min-width: 0; max-width: 100%; }
  .filters { flex-direction: column; align-items: stretch; }
  .search { width: 100%; }
  .search input { width: 100%; box-sizing: border-box; }
  .tracks { flex-wrap: wrap; }
}

/* ============ 统一风格：网格底、粗描边卡片、等宽标签 ============ */
body {
  background-color: var(--bg);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 40px 40px;
}
.hero { background: radial-gradient(900px 360px at 85% -10%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 70%); border-bottom: 1px solid var(--line); }
.hero h1 { font-weight: 900; letter-spacing: -.02em; }
.hero h1 span { color: var(--ink-3); font-weight: 800; }
.kicker { color: var(--accent); }
.hero-stats div { border-left-color: var(--accent); }
.hero-stats dd { font-weight: 900; }
.track.is-active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.toolbar { background: color-mix(in srgb, var(--bg) 86%, transparent); }
.progress { background: var(--accent); }
.era-no { color: var(--accent); }
.era-title h2 { font-weight: 900; letter-spacing: -.01em; }
.card { border: 2.5px solid var(--edge); border-left: 6px solid var(--c); border-radius: 14px; box-shadow: var(--shadow); margin: 6px 6px 0 6px; }
.card:hover { border-color: var(--edge); border-left-color: var(--c); }
.card h3 { font-weight: 800; letter-spacing: -.01em; }
.badge { font-family: var(--mono); letter-spacing: .06em; }
.stat b { font-weight: 900; }
[data-type="closed"] .stat b { color: var(--ink); }
.item::after { box-shadow: 0 0 0 4px var(--bg); }
.chip { font-weight: 600; }
.ext { color: var(--accent); }
.jump:hover { border-color: var(--accent); color: var(--accent); }
.search input:focus { outline-color: var(--accent); }
.footer { border-top-color: var(--line); }

/* ============ 反馈弹窗 ============ */
.fb { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 16px; }
.fb[hidden] { display: none; }
.fb-scrim { position: absolute; inset: 0; background: rgba(10,10,12,.45); backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px); }
.fb-box {
  position: relative; width: min(520px, 100%); max-height: calc(100vh - 32px); overflow-y: auto;
  background: var(--card); color: var(--ink); border: 2.5px solid var(--line, var(--edge)); border-radius: 18px;
  box-shadow: 0 30px 60px -20px rgba(0,0,0,.45); padding: 26px 26px 22px; font: 15px/1.5 var(--sans);
}
.fb-box h2 { margin: 0 0 14px; font: 900 24px/1.2 var(--sans); }
.fb-x { position: absolute; top: 14px; right: 14px; width: 34px; height: 34px; border-radius: 50%; border: 0; background: transparent; color: var(--ink-3); font-size: 22px; cursor: pointer; }
.fb-x:hover { color: var(--ink); }
.fb-types { display: flex; gap: 6px; flex-wrap: wrap; }
.fb-type input { position: absolute; opacity: 0; pointer-events: none; }
.fb-type span { display: inline-block; padding: 7px 14px; border-radius: 999px; border: 1.5px solid var(--ink-3); font-weight: 700; font-size: 14px; cursor: pointer; }
.fb-type input:checked + span { background: var(--ink); color: var(--card); border-color: var(--ink); }
.fb-type input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }
.fb-hint { margin: 10px 0 14px; color: var(--ink-2); font-size: 14px; }
.fb-row { display: block; margin-bottom: 12px; }
.fb-row[hidden], .fb-two[hidden] { display: none; }
.fb-row > span { display: block; font-size: 13px; font-weight: 600; color: var(--ink-3); margin-bottom: 4px; }
.fb-two { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
.fb input:not([type=radio]), .fb select, .fb textarea {
  width: 100%; box-sizing: border-box; font: 15px/1.45 var(--sans); color: var(--ink);
  background: var(--bg, var(--paper)); border: 1.5px solid var(--ink-3); border-radius: 10px; padding: 9px 11px;
}
.fb textarea { resize: vertical; min-height: 110px; }
.fb input:focus, .fb select:focus, .fb textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
.fb-trap { position: absolute !important; left: -9999px; width: 1px; height: 1px; }
.fb-status { margin: 2px 0 10px; font-size: 14px; min-height: 1em; }
.fb-status.is-err { color: var(--event); }
.fb-status.is-ok { color: var(--accent); font-weight: 600; }
.fb-actions { display: flex; justify-content: flex-end; }
.fb-send { border: 0; border-radius: 10px; padding: 10px 22px; background: var(--ink); color: var(--card); font: 700 15px var(--sans); cursor: pointer; }
.fb-send:disabled { opacity: .6; cursor: wait; }
@media (max-width: 520px) { .fb-two { grid-template-columns: 1fr; } .fb-box { padding: 22px 18px 18px; } }

.report { border: 0; background: none; padding: 0; color: var(--ink-3); font: 600 13px var(--sans); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.report:hover { color: var(--ink); }
.foot-biz { margin-top: 10px; border: 1.5px solid var(--ink); background: none; color: var(--ink); border-radius: 999px; padding: 7px 16px; font: 700 14px var(--sans); cursor: pointer; }
.foot-biz:hover { background: var(--ink); color: var(--bg); }

/* ============ 隐私政策页 ============ */
.legal-top { max-width: 760px; margin: 0 auto; padding: 28px 24px 0; }
.legal { max-width: 760px; margin: 0 auto; padding: 24px 24px 80px; }
.legal article { background: var(--card); border: 2.5px solid var(--edge); border-radius: 16px; padding: 36px 40px 40px; box-shadow: var(--shadow); }
.legal h1 { margin: 0; font: 900 40px/1.15 var(--sans); letter-spacing: -.02em; }
.legal-date { margin: 6px 0 24px; font: 500 13px var(--mono); color: var(--ink-3); }
.legal h2 { margin: 32px 0 8px; font: 800 20px/1.3 var(--sans); }
.legal h3 { margin: 18px 0 4px; font: 700 16px/1.4 var(--sans); }
.legal p, .legal li { font-size: 15.5px; line-height: 1.75; color: var(--ink-2); }
.legal p { margin: 8px 0; max-width: 68ch; }
.legal ul { margin: 6px 0; padding-left: 22px; }
.legal b { color: var(--ink); }
.legal a { color: var(--accent); }
.legal .is-missing { color: var(--event); font-weight: 700; }
.foot-link { color: var(--ink-3); }
@media (max-width: 720px) { .legal article { padding: 24px 20px 28px; } .legal h1 { font-size: 30px; } }

.fb-note { margin: 0 0 8px; font-size: 12.5px; color: var(--ink-3); }
.fb-note a { color: var(--accent); }

/* 页面脚本运行前的文字目录（给搜索引擎和 AI），脚本运行后会被替换 */
.seo-dir { max-width: 1080px; margin: 0 auto; padding: 32px 24px; }
.seo-dir ul { padding-left: 1.2em; }
.seo-dir li { margin: 6px 0; }
.seo-dir time { font-family: var(--mono); color: var(--ink-3); font-size: .85em; }
.links .report + .report { margin-left: 14px; }

.foot-copy { color: var(--ink-3); }