/* ==========================================================================
   欧博中心 · 共享样式表  /assets/site.css
   深青轨道 + 砂岩画布 + 酥油灯金 · 桌面端记录查询站点
   ========================================================================== */

/* ── 1. Reset ───────────────────────────────────────────────────────────── */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd, hr {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
[hidden] { display: none !important; }
table { border-collapse: collapse; }

/* ── 2. 变量 ─────────────────────────────────────────────────────────────── */
:root {
  --deep: #0E3B3A;
  --deep-2: #08292A;
  --sand: #F4EEE4;
  --sand-2: #FBF7F0;
  --gold: #C9A227;
  --crimson: #B23A2E;
  --indigo: #2E4E7E;
  --stone: #6B6A63;
  --mist: #C8D6D2;
  --ink: #22221E;

  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", Songti, "SimSun", serif;
  --font-sans: "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --rail-w: 180px;
  --gutter: clamp(18px, 3.2vw, 56px);
  --radius-l: 28px;
  --radius-m: 22px;
  --radius-s: 14px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

@media (min-width: 1024px) { :root { --rail-w: 200px; } }
@media (min-width: 1280px) { :root { --rail-w: 220px; } }

/* ── 3. 基础排版 ─────────────────────────────────────────────────────────── */
body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
  background-color: var(--sand);
  background-image:
    radial-gradient(1100px 480px at 6% -12%, rgba(14, 59, 58, .10), transparent 64%),
    radial-gradient(820px 380px at 98% 0%, rgba(201, 162, 39, .13), transparent 60%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
}

@media (min-width: 1024px) { body { padding-left: var(--rail-w); } }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.3;
  color: var(--deep);
}
h1 { font-size: clamp(30px, 4.2vw, 48px); }
h2 { font-size: clamp(24px, 2.8vw, 34px); }
h3 { font-size: clamp(19px, 1.8vw, 23px); }
h4 { font-size: 17px; }
p { max-width: 68ch; }
strong { font-weight: 700; }

:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; border-radius: 8px; }
::selection { background: rgba(201, 162, 39, .35); color: var(--ink); }

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}
.tone-gold { color: var(--gold); }
.tone-crimson { color: var(--crimson); }
.tone-indigo { color: var(--indigo); }

/* ── 4. 跳转链接 ─────────────────────────────────────────────────────────── */
.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 120;
  padding: 11px 20px;
  border-radius: 0 0 var(--radius-s) var(--radius-s);
  background: var(--gold);
  color: #211A05;
  font-size: 14px;
  letter-spacing: .08em;
  font-weight: 600;
  transition: top 160ms var(--ease);
}
.skip-link:focus { top: 0; }

/* ── 5. 左侧索引轨道 ─────────────────────────────────────────────────────── */
.site-header { position: relative; z-index: 60; }

.rail {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--rail-w);
  z-index: 30;
  display: flex;
  flex-direction: column;
  padding: 28px 18px 22px;
  background: linear-gradient(180deg, #0E3B3A 0%, #0B3333 48%, #08292A 100%);
  color: var(--sand);
  overflow: hidden;
}
.rail::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(200, 214, 210, .42) 22%, rgba(200, 214, 210, .28) 78%, transparent);
}

.rail__title {
  display: flex;
  align-items: center;
  gap: 9px;
  max-width: none;
  padding: 0 10px 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: rgba(200, 214, 210, .72);
}
.rail__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, .18);
}

.rail__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.rail__item { display: block; }

.rail__link {
  display: flex;
  align-items: baseline;
  gap: 11px;
  padding: 10px 12px;
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: .12em;
  color: rgba(244, 238, 228, .72);
  transition: background 160ms var(--ease), color 160ms var(--ease);
}
.rail__link:hover,
.rail__link:focus-visible {
  background: rgba(244, 238, 228, .09);
  color: var(--sand);
}
.rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: rgba(200, 214, 210, .55);
  transition: color 160ms var(--ease);
}
.rail__label { display: inline-block; }

.rail__link[aria-current="page"] {
  background: rgba(201, 162, 39, .14);
  color: #FBF7F0;
}
.rail__link[aria-current="page"] .rail__num { color: var(--gold); }
.rail__link[aria-current="page"] .rail__label::after {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-left: 8px;
  border-radius: 50%;
  background: var(--gold);
  vertical-align: middle;
}

.rail__foot {
  margin-top: auto;
  padding: 16px 10px 0;
  border-top: 1px solid rgba(200, 214, 210, .18);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.rail__note {
  font-size: 12px;
  line-height: 1.6;
  color: rgba(200, 214, 210, .62);
}
.rail__note--mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .03em;
  word-break: break-all;
}

/* ── 6. 悬浮胶囊浮岛导航 ─────────────────────────────────────────────────── */
.island {
  position: fixed;
  top: 18px;
  left: calc(var(--rail-w) + var(--gutter));
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: calc(100vw - var(--rail-w) - var(--gutter) - 24px);
  padding: 8px 8px 8px 16px;
  border-radius: 999px;
  background: rgba(251, 247, 240, .84);
  border: 1px solid rgba(14, 59, 58, .12);
  box-shadow: 0 14px 34px -22px rgba(8, 41, 42, .65);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  backdrop-filter: blur(14px) saturate(1.15);
}

.island__brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  padding-right: 6px;
}
.island__mark {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 30%, #EFD874, #C9A227 58%, #8A6F16);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, .16);
}
.island__name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .08em;
  color: var(--deep);
  white-space: nowrap;
}

.island__nav {
  display: flex;
  align-items: center;
  gap: 2px;
}
.island__item { display: flex; }

.navlink {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: .12em;
  color: #3E4A48;
  white-space: nowrap;
  transition: background 160ms var(--ease), color 160ms var(--ease);
}
.navlink:hover,
.navlink:focus-visible {
  background: rgba(14, 59, 58, .08);
  color: var(--deep);
}
.navlink[aria-current="page"] {
  background: var(--deep);
  color: var(--sand);
}
.navlink[aria-current="page"]::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, .22);
  flex: 0 0 auto;
}

.island__toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid rgba(14, 59, 58, .16);
  color: var(--deep);
  font-size: 13px;
  letter-spacing: .12em;
  transition: background 160ms var(--ease), border-color 160ms var(--ease);
}
.island__toggle:hover { background: rgba(14, 59, 58, .07); }
.island__toggle-text { line-height: 1; }
.island__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--deep);
  transition: background 200ms var(--ease);
}
.island__bars::before,
.island__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--deep);
  transition: transform 200ms var(--ease);
}
.island__bars::before { top: -5px; }
.island__bars::after { top: 5px; }

.island__toggle[aria-expanded="true"] .island__bars { background: transparent; }
.island__toggle[aria-expanded="true"] .island__bars::before { transform: translateY(5px) rotate(45deg); }
.island__toggle[aria-expanded="true"] .island__bars::after { transform: translateY(-5px) rotate(-45deg); }

/* ── 7. 页脚 ─────────────────────────────────────────────────────────────── */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: 40px;
  padding: 66px 0 44px;
  background: linear-gradient(180deg, #0E3B3A 0%, #0A3131 42%, #08292A 100%);
  color: rgba(244, 238, 228, .8);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(720px 320px at 88% -6%, rgba(201, 162, 39, .18), transparent 62%);
  pointer-events: none;
}

.foot-inner {
  position: relative;
  width: 100%;
  max-width: 1240px;
  padding-inline: var(--gutter);
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.25fr 1fr;
  gap: 36px;
  padding-bottom: 38px;
  border-bottom: 1px solid rgba(200, 214, 210, .18);
}

.foot-brand__name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: .1em;
  color: #F4EEE4;
  max-width: none;
}
.foot-brand__line {
  margin-top: 12px;
  max-width: 32ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(244, 238, 228, .7);
}
.foot-brand__rule {
  display: block;
  width: 54px;
  height: 2px;
  margin: 18px 0;
  background: var(--gold);
}
.foot-brand__mono {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: rgba(200, 214, 210, .66);
  max-width: none;
}

.foot-col { min-width: 0; }
.foot-col__title {
  margin-bottom: 16px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--gold);
}

.foot-list { display: grid; gap: 10px; }
.foot-list--legal {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed rgba(200, 214, 210, .22);
}
.foot-link {
  font-size: 14.5px;
  letter-spacing: .06em;
  color: rgba(244, 238, 228, .78);
  transition: color 160ms var(--ease);
}
.foot-link:hover,
.foot-link:focus-visible {
  color: #FBF7F0;
  text-decoration: underline;
  text-underline-offset: 5px;
  text-decoration-color: rgba(201, 162, 39, .75);
}

.foot-contact { display: grid; gap: 12px; }
.foot-contact__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}
.foot-contact__key {
  padding-top: 3px;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: rgba(200, 214, 210, .6);
}
.foot-contact__val {
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(244, 238, 228, .86);
  word-break: break-all;
}
.foot-contact__val--mono {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: .03em;
}

.foot-col--meta { align-self: start; }
.foot-meta { display: grid; gap: 10px; }
.foot-meta__row {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 238, 228, .74);
  max-width: none;
}
.foot-meta__row--mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--gold);
}

/* ── 8. 回到顶部 ─────────────────────────────────────────────────────────── */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 45;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(251, 247, 240, .92);
  border: 1px solid rgba(14, 59, 58, .18);
  color: var(--deep);
  box-shadow: 0 18px 34px -22px rgba(8, 41, 42, .8);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 200ms var(--ease), transform 200ms var(--ease), visibility 200ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--gold); color: var(--gold); }
.to-top__glyph {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
}

/* ── 9. 页面主容器与网格 ─────────────────────────────────────────────────── */
.page-main {
  display: block;
  padding: 112px 0 40px;
}
#main-content { scroll-margin-top: 100px; }

.wrap {
  width: 100%;
  max-width: 1240px;
  padding-inline: var(--gutter);
}
.canvas { max-width: 720px; }

.section { padding: 72px 0; }
.section--tight { padding: 44px 0; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 30px;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--stone);
}
.lede {
  margin-top: 16px;
  font-size: 18px;
  line-height: 1.85;
  color: #3B4340;
  max-width: 58ch;
}
.rule {
  height: 1px;
  border: 0;
  margin: 34px 0;
  background: var(--mist);
}

.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); align-items: start; }

.stack > * + * { margin-top: 20px; }
.stack--lg > * + * { margin-top: 34px; }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }

/* ── 10. 背景分区 ────────────────────────────────────────────────────────── */
.band { padding: 76px 0; }
.band--glow {
  background:
    radial-gradient(900px 400px at 14% -10%, rgba(201, 162, 39, .16), transparent 62%),
    linear-gradient(180deg, #FBF7F0, #F4EEE4);
}
.band--sand2 { background: var(--sand-2); }
.band--deep {
  background: linear-gradient(168deg, #0E3B3A, #08292A);
  color: rgba(244, 238, 228, .86);
}
.band--deep h1,
.band--deep h2,
.band--deep h3,
.band--deep h4 { color: #F4EEE4; }
.band--deep .lede { color: rgba(244, 238, 228, .78); }
.band--deep .eyebrow,
.band--deep .metric__label { color: rgba(200, 214, 210, .68); }
.band--deep .rule { background: rgba(200, 214, 210, .22); }

/* ── 11. 按钮 ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .06em;
  transition: background 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease), transform 160ms var(--ease);
}
.btn:hover { transform: translateY(-1px); }

.btn--gold {
  background: var(--gold);
  color: #211A05;
  box-shadow: 0 16px 30px -20px rgba(201, 162, 39, .95);
}
.btn--gold:hover { background: #D9B438; }

.btn--deep { background: var(--deep); color: var(--sand); }
.btn--deep:hover { background: #0A2E2E; }

.btn--line { border-color: rgba(14, 59, 58, .3); color: var(--deep); }
.btn--line:hover { border-color: var(--deep); background: rgba(14, 59, 58, .06); }

.btn--onDeep { border-color: rgba(200, 214, 210, .42); color: var(--sand); }
.btn--onDeep:hover { background: rgba(244, 238, 228, .1); border-color: var(--gold); color: #FBF7F0; }

/* ── 12. 面包屑 ──────────────────────────────────────────────────────────── */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--stone);
}
.crumbs__link { color: var(--indigo); transition: color 160ms var(--ease); }
.crumbs__link:hover { color: var(--deep); text-decoration: underline; text-underline-offset: 4px; }
.crumbs__sep { color: var(--mist); }
.crumbs__here { color: var(--ink); }

/* ── 13. 框景 ────────────────────────────────────────────────────────────── */
.frame {
  position: relative;
  padding: clamp(22px, 3vw, 44px);
  border-radius: var(--radius-l);
  border: 1px solid rgba(14, 59, 58, .14);
  background: linear-gradient(152deg, #FBF7F0 0%, #F4EEE4 54%, #E9F0EC 100%);
  box-shadow: 0 34px 64px -48px rgba(8, 41, 42, .72);
}
.frame::before {
  content: "";
  position: absolute;
  inset: 10px;
  border-radius: calc(var(--radius-l) - 8px);
  border: 1px dashed rgba(14, 59, 58, .16);
  pointer-events: none;
}
.frame__ticks {
  position: absolute;
  top: 12px;
  left: 13%;
  right: 13%;
  height: 8px;
  background-image: repeating-linear-gradient(90deg, rgba(14, 59, 58, .38) 0 1px, transparent 1px 12px);
  pointer-events: none;
}
.frame__ticks::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background-image: repeating-linear-gradient(90deg, rgba(14, 59, 58, .38) 0 1px, transparent 1px 12px);
  transform: scaleY(-1);
  transform-origin: bottom;
  display: none;
}
.frame__inner { position: relative; }

.frame--deep {
  border-color: rgba(200, 214, 210, .22);
  background: linear-gradient(152deg, #0E3B3A 0%, #0B3333 50%, #08292A 100%);
  color: rgba(244, 238, 228, .86);
  box-shadow: 0 40px 70px -50px rgba(8, 41, 42, .95);
}
.frame--deep::before { border-color: rgba(200, 214, 210, .2); }
.frame--deep .frame__ticks {
  background-image: repeating-linear-gradient(90deg, rgba(201, 162, 39, .55) 0 1px, transparent 1px 12px);
}
.frame--deep h1,
.frame--deep h2,
.frame--deep h3 { color: #F4EEE4; }

/* ── 14. 控制台面板与读数 ────────────────────────────────────────────────── */
.panel {
  padding: 22px;
  border-radius: var(--radius-m);
  border: 1px solid rgba(14, 59, 58, .1);
  background: var(--sand-2);
}
.panel--deep {
  border-color: rgba(200, 214, 210, .16);
  background: linear-gradient(160deg, #0E3B3A, #08292A);
  color: rgba(244, 238, 228, .86);
}
.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--mist);
}
.panel--deep .panel__head { border-color: rgba(200, 214, 210, .18); }
.panel__title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--deep);
}
.panel--deep .panel__title { color: #F4EEE4; }
.panel__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--stone);
}
.panel--deep .panel__meta { color: rgba(200, 214, 210, .72); }

.metric { display: flex; flex-direction: column; gap: 4px; }
.metric__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.12;
  letter-spacing: .04em;
  color: var(--deep);
  font-variant-numeric: tabular-nums;
}
.metric__value--gold { color: var(--gold); }
.metric__label {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--stone);
}
.panel--deep .metric__value { color: var(--gold); }
.panel--deep .metric__label { color: rgba(200, 214, 210, .72); }

/* ── 15. 标签筛选 ────────────────────────────────────────────────────────── */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 15px;
  border-radius: 999px;
  border: 1px solid rgba(46, 78, 126, .28);
  background: transparent;
  color: var(--indigo);
  font-size: 13px;
  letter-spacing: .08em;
  transition: background 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}
.chip:hover { background: rgba(46, 78, 126, .09); }
.chip[aria-pressed="true"],
.chip--on {
  background: var(--indigo);
  border-color: var(--indigo);
  color: #F4EEE4;
}

/* ── 16. 时间轴 ──────────────────────────────────────────────────────────── */
.timeline { position: relative; }
.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--mist), rgba(200, 214, 210, .16));
}
.timeline__item {
  position: relative;
  padding: 0 0 26px 34px;
}
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--sand-2);
  border: 2px solid var(--mist);
  transition: border-color 200ms var(--ease), background 200ms var(--ease), box-shadow 200ms var(--ease);
}
.timeline__item:hover::before {
  border-color: var(--gold);
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(201, 162, 39, .18);
}
.timeline__time {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--stone);
}
.timeline__title {
  margin-top: 2px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--deep);
}
.timeline__text {
  margin-top: 4px;
  font-size: 15.5px;
  color: #414A47;
  max-width: 60ch;
}

/* ── 17. 手风琴与明细展开 ────────────────────────────────────────────────── */
.accordion { border-top: 1px solid var(--mist); }
.accordion__item { border-bottom: 1px solid var(--mist); }
.accordion__btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 2px;
  text-align: left;
  font-size: 16px;
  letter-spacing: .02em;
  color: var(--ink);
  transition: color 160ms var(--ease);
}
.accordion__btn:hover { color: var(--deep); }
.accordion__btn::after {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-right: 1.6px solid currentColor;
  border-bottom: 1.6px solid currentColor;
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 200ms var(--ease);
}
.accordion__btn[aria-expanded="true"] { color: var(--deep); }
.accordion__btn[aria-expanded="true"]::after { transform: rotate(-135deg) translate(-2px, -2px); }
.accordion__panel {
  height: 0;
  overflow: hidden;
  transition: height 220ms var(--ease);
}
.accordion__panel-inner {
  padding: 0 2px 20px;
  font-size: 15.5px;
  line-height: 1.85;
  color: #414A47;
}

/* ── 18. 视图切换标签 ────────────────────────────────────────────────────── */
.tabs {
  display: inline-flex;
  gap: 4px;
  padding: 5px;
  border-radius: 999px;
  background: var(--sand-2);
  border: 1px solid rgba(14, 59, 58, .12);
}
.tab {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 20px;
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--stone);
  transition: background 160ms var(--ease), color 160ms var(--ease);
}
.tab:hover { color: var(--deep); }
.tab[aria-selected="true"] { background: var(--deep); color: var(--sand); }
.tab__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: inherit;
  opacity: .75;
}
.tab[aria-selected="true"] .tab__num { color: var(--gold); opacity: 1; }

.tabpanels { margin-top: 26px; }
.tabpanel { outline: none; }

/* ── 19. 图片容器 ────────────────────────────────────────────────────────── */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-m);
  border: 1px solid rgba(14, 59, 58, .1);
  background:
    radial-gradient(420px 220px at 22% 12%, rgba(14, 59, 58, .16), transparent 66%),
    linear-gradient(140deg, #DDE6E2 0%, #F4EEE4 58%, #E6E1D6 100%);
}
.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.86) contrast(1.03);
}
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--paper {
  aspect-ratio: 3 / 2;
  background: linear-gradient(150deg, #FBF7F0 0%, #F1E9DA 100%);
}
.media__tag {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(8, 41, 42, .74);
  color: #EFE7D9;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
}
.media__cap {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--stone);
  max-width: 58ch;
}

/* ── 20. 响应式 ──────────────────────────────────────────────────────────── */
@media (max-width: 1023px) {
  .rail { display: none; }

  .island {
    top: 12px;
    left: 14px;
    right: 14px;
    max-width: none;
    justify-content: space-between;
    padding: 8px 8px 8px 14px;
  }
  .island__toggle { display: inline-flex; }

  .island__nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 12px;
    border-radius: var(--radius-m);
    background: rgba(251, 247, 240, .97);
    border: 1px solid rgba(14, 59, 58, .12);
    box-shadow: 0 24px 48px -26px rgba(8, 41, 42, .6);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 200ms var(--ease), transform 200ms var(--ease), visibility 200ms var(--ease);
  }
  .island__nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .navlink {
    width: 100%;
    padding: 12px 14px;
    border-radius: var(--radius-s);
    font-size: 14px;
  }

  .page-main { padding-top: 96px; }
  .foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 30px; }
}

@media (max-width: 900px) {
  .grid--2,
  .grid--3,
  .grid--split { grid-template-columns: minmax(0, 1fr); }
  .section { padding: 52px 0; }
  .band { padding: 54px 0; }
  .frame { border-radius: var(--radius-m); }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .foot-grid { grid-template-columns: minmax(0, 1fr); gap: 26px; }
  .site-footer { padding: 52px 0 36px; }
  .to-top { right: 14px; bottom: 14px; }
  .foot-contact__item { grid-template-columns: 40px minmax(0, 1fr); }
}

/* ── 21. 动效降级 ────────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}