/* ==========================================================================
   timeline.css — 记录页
   与履历页同属「内容页」家族：浅色纸面、衬线标题、等宽元数据。
   区别是这一页的主角是时间轴与关联链条。
   ========================================================================== */
:root {
  --paper: #fbfaf7;
  --paper-2: #f4f2ec;
  --ink: #14161a;
  --ink2: #565d66;
  --ink3: #8d939a;
  --rule: #e3dfd5;
  --rule-2: #cdc7ba;
  --accent: #0f766e;
  --k-do: #1d4ed8;
  --k-xue: #0f766e;
  --k-xiang: #a16207;
  --k-da: #6d28d9;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Songti SC",
    "Noto Serif SC", serif;
  --sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "Cascadia Code", Consolas, monospace;
  --wrap: 1020px;
  --nav-h: 56px;
}

*,
*::before,
*::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { margin: 0; line-height: 1.3; font-weight: 600; letter-spacing: -0.012em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
::selection { background: var(--k-da); color: #fff; }
:focus-visible { outline: 2px solid var(--k-do); outline-offset: 3px; border-radius: 4px; }
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 clamp(20px, 4vw, 44px); }
.mono { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink3); }
.k-do { color: var(--k-do); }
.k-xue { color: var(--k-xue); }
.k-xiang { color: var(--k-xiang); }
.k-da { color: var(--k-da); }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}
.topbar__inner { display: flex; align-items: center; gap: 18px; width: 100%; }
.brand { display: inline-flex; align-items: center; gap: 9px; flex: none; }
.brand__mark {
  width: 24px; height: 24px; border-radius: 8px; display: grid; place-items: center;
  font-family: var(--serif); font-size: 0.82rem; font-weight: 700;
  color: var(--paper); background: var(--accent);
}
.brand__name { font-weight: 600; letter-spacing: -0.01em; }
.nav { display: flex; gap: 2px; margin-left: auto; }
.nav a {
  padding: 6px 12px; border-radius: 999px; font-size: 0.9rem; color: var(--ink2);
  transition: color 0.2s ease, background 0.2s ease;
}
.nav a:hover { color: var(--ink); background: var(--paper-2); }
.nav a.is-active { color: var(--ink); font-weight: 500; background: var(--paper-2); }
.chip {
  display: inline-flex; align-items: center; height: 32px; padding: 0 14px;
  border: 1px solid var(--rule-2); border-radius: 999px;
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.08em; color: var(--ink2);
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}
.chip:hover { color: var(--ink); border-color: var(--ink3); background: #fff; }

/* ---------- 页头 ---------- */
.page-head { padding: clamp(36px, 6vw, 62px) 0 26px; border-bottom: 3px double var(--ink); }
.kicker { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink3); }
.page-head__title { font-family: var(--serif); font-size: clamp(2.4rem, 6.4vw, 3.6rem); font-weight: 500; letter-spacing: -0.03em; margin: 12px 0 14px; }
.page-head__lede { max-width: 64ch; color: var(--ink2); font-size: 1rem; }
.page-head__lede b { font-weight: 600; }
.page-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px 26px; margin: 24px 0 0; padding-top: 18px; border-top: 1px solid var(--rule); }
.stat__v { font-family: var(--serif); font-size: 1.7rem; line-height: 1; }
.stat__k { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink3); margin-top: 6px; }

/* ---------- 链条 ---------- */
.chain-box { margin-top: clamp(34px, 5vw, 52px); padding: 24px 26px; border: 1px solid var(--rule-2); background: var(--paper-2); }
.chain-box__head { display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.chain-box__title { font-family: var(--serif); font-size: 1.24rem; }
.chain-box__head .mono { margin-left: auto; }
.chains { display: grid; gap: 18px; }
.chain { border-top: 1px solid var(--rule-2); padding-top: 16px; }
.chain:first-child { border-top: 0; padding-top: 0; }
.chain__head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin-bottom: 12px; }
.chain__list { display: flex; align-items: stretch; gap: 0; flex-wrap: wrap; }
.chain__arrow { display: grid; place-items: center; padding: 0 10px; color: var(--ink3); font-size: 1rem; }
.node {
  display: block; flex: 1 1 190px; min-width: 170px;
  border: 1px solid var(--rule-2); border-left: 2px solid var(--k, var(--ink));
  background: var(--paper); padding: 12px 14px;
  transition: transform 0.22s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.22s ease, box-shadow 0.22s ease;
}
.node:hover { transform: translateY(-3px); box-shadow: 0 14px 30px -20px rgba(20, 22, 26, 0.5); }
.node__meta { display: flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.08em; }
.node__kind { color: var(--k); border: 1px solid currentColor; border-radius: 999px; padding: 1px 7px; }
.node__date { color: var(--ink3); }
.node__title { font-size: 0.92rem; font-weight: 500; margin-top: 7px; }

/* ---------- 筛选 ---------- */
.filters { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin: clamp(30px, 4vw, 44px) 0 26px; }
.filters__label { margin-right: 4px; }
/* 这是按钮的包裹层：它必须是 flex，否则按钮不再是 .filters 的 flex 子项，间距会消失 */
.filters__buttons { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.filters__count { margin-left: auto; }
.filters__count b { color: var(--ink); }
.filter {
  display: inline-flex; align-items: center; gap: 7px;
  height: 34px; padding: 0 14px; border: 1px solid var(--rule-2); border-radius: 999px;
  font-size: 0.88rem; color: var(--ink2);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.filter:hover { color: var(--ink); border-color: var(--ink3); }
.filter b { font-family: var(--mono); font-size: 0.68rem; color: var(--ink3); }
.filter.is-active { color: var(--paper); background: var(--ink); border-color: var(--ink); }
.filter.is-active b { color: color-mix(in srgb, var(--paper) 70%, transparent); }

/* ---------- 时间轴 ---------- */
.timeline { padding-bottom: 8px; }
/* 没有记录时的空状态 */
.empty { color: var(--ink3); font-size: 0.94rem; padding: 22px 0; }
.year { margin-bottom: clamp(26px, 4vw, 40px); }
.year__head { display: flex; align-items: baseline; gap: 14px; padding-bottom: 10px; border-bottom: 1px solid var(--ink); }
.year__label { font-family: var(--serif); font-size: 1.5rem; letter-spacing: -0.02em; }
.year__count { font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.1em; color: var(--ink3); }
.year__toggle { margin-left: auto; font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.08em; color: var(--ink3); }
.year__toggle:hover { color: var(--ink); }
.year__body { position: relative; padding-left: 26px; }
.year__body::before {
  content: ""; position: absolute; left: 5px; top: 8px; bottom: 8px; width: 1px;
  background: linear-gradient(to bottom, transparent, var(--rule-2) 6%, var(--rule-2) 94%, transparent);
}
.year.is-collapsed .year__body { display: none; }
.year.is-collapsed { margin-bottom: 14px; }

.tl { position: relative; padding: 16px 0; }
.tl[hidden] { display: none; }
.tl__node {
  position: absolute; left: -25px; top: 24px;
  width: 11px; height: 11px; border-radius: 50%;
  border: 1px solid var(--rule-2); background: var(--paper);
  display: grid; place-items: center;
}
.tl__node::after { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--k); }
.tl__card { border-bottom: 1px solid var(--rule); padding-bottom: 16px; }
.tl:last-child .tl__card { border-bottom: 0; }
.tl__meta { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.08em; }
.tl__date { color: var(--ink3); }
.tl__kind { color: var(--k); border: 1px solid currentColor; border-radius: 999px; padding: 1px 9px; }
.tl__status { color: var(--ink3); border: 1px dashed var(--rule-2); border-radius: 999px; padding: 1px 8px; }
.tl__title { font-family: var(--serif); font-size: 1.16rem; margin: 9px 0 6px; letter-spacing: -0.01em; }
.tl__text { color: var(--ink2); font-size: 0.95rem; }
.tl__insight { margin-top: 9px; padding-left: 13px; border-left: 2px solid var(--k); font-size: 0.9rem; color: var(--ink2); }
.tl__insight span { display: block; font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink3); margin-bottom: 3px; }
.tl__from { margin-top: 9px; font-family: var(--mono); font-size: 0.64rem; color: var(--ink3); }
.tl__from a { color: var(--k-do); border-bottom: 1px solid color-mix(in srgb, var(--k-do) 35%, transparent); }
.tl__from a:hover { border-bottom-color: var(--k-do); }
.tl .tag { display: inline-block; margin-left: 8px; font-family: var(--mono); font-size: 0.6rem; color: var(--ink3); border: 1px solid var(--rule); border-radius: 5px; padding: 1px 6px; }
.tl__tags { margin-top: 10px; display: flex; gap: 6px; flex-wrap: wrap; }
.tl__tags .tag { margin-left: 0; }

/* 跳转高亮 */
@keyframes hit {
  0% { background: color-mix(in srgb, var(--k, var(--k-do)) 16%, transparent); }
  100% { background: transparent; }
}
.tl.is-hit .tl__card { animation: hit 1.8s ease-out; }
.tl, .year { scroll-margin-top: calc(var(--nav-h) + 20px); }

/* ---------- 页尾引导 ---------- */
.outro {
  margin: clamp(40px, 6vw, 66px) 0 0;
  padding: clamp(26px, 4vw, 40px);
  border: 1px solid var(--rule-2);
  background: var(--paper-2);
  display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
.outro__title { font-family: var(--serif); font-size: 1.36rem; }
.outro__text { color: var(--ink2); font-size: 0.94rem; margin-top: 8px; max-width: 52ch; }
.outro__cta { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; height: 42px; padding: 0 18px;
  border: 1px solid var(--rule-2); border-radius: 999px; font-size: 0.9rem;
  background: #fff; transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.btn:hover { transform: translateY(-2px); border-color: var(--ink3); box-shadow: 0 12px 26px -18px rgba(20, 22, 26, 0.5); }
.btn--solid { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ---------- 页脚 ---------- */
.footer { margin-top: 30px; padding: 24px 0 52px; border-top: 1px solid var(--rule); }
.footer__inner { display: flex; justify-content: space-between; gap: 12px 22px; flex-wrap: wrap; font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink3); }
.footer__links { display: flex; gap: 18px; }
.footer__links a:hover { color: var(--ink); }

/* ---------- 滚动入场 ---------- */
.js .reveal { opacity: 0; transform: translateY(12px); transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1); }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .nav { display: none; }
  .chain-box__head .mono { display: none; }
  .chain__list { flex-direction: column; }
  .chain__arrow { transform: rotate(90deg); padding: 4px 0; }
  .node { flex: 1 1 auto; }
  .filters__count { margin-left: 0; width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; }
  .tl.is-hit .tl__card { animation: none; }
}

/* ---------- 打印 ---------- */
@media print {
  @page { margin: 16mm 14mm; }
  html, body { background: #fff; color: #000; font-size: 10.5pt; }
  .topbar, .filters, .outro, .footer { display: none !important; }
  .chain-box { background: none; border-color: #999; }
  .tl, .year { break-inside: avoid; page-break-inside: avoid; }
  .js .reveal { opacity: 1 !important; transform: none !important; }
}