/* ============================================================
   site.css — 米兰MILAN中国站 / archive-milan.com.cn
   复古档案馆 × 现代数字体验 · 全站共享样式
   ============================================================ */

/* ---------- 01 Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { min-height: 100vh; }
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; }
p, h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
ul, ol { list-style: none; }
[hidden] { display: none !important; }
button { appearance: none; -webkit-appearance: none; background: none; border: none; border-radius: 0; padding: 0; cursor: pointer; font: inherit; color: inherit; }

/* ---------- 02 CSS 变量 ---------- */
:root {
  /* 色彩体系 */
  --c-red: #A6192E;
  --c-black: #11100F;
  --c-gold: #C9A063;
  --c-paper: #F5F1E8;
  --c-mist: #E6E2D8;
  --c-rust: #8C2E34;
  --c-taupe: #4C4643;
  --c-blue: #4B7FFF;
  --c-darkgold: #8C6C41;
  --c-ink: #000000;

  /* 字体体系 */
  --font-head: Georgia, "Times New Roman", "Noto Serif SC", "Songti SC", SimSun, serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, ui-monospace, Consolas, "Roboto Mono", "Liberation Mono", Menlo, monospace;

  /* 尺寸与间距 */
  --max-w: 1280px;
  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --space-1: .5rem;
  --space-2: .75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 5rem;

  --font-h1: clamp(2.5rem, 6vw, 4.8rem);
  --font-h2: clamp(1.8rem, 3vw, 2.6rem);
  --font-card: 1.25rem;
  --font-body-size: .95rem;

  --shadow-card: 0 12px 24px -18px rgba(17,16,15,.35);
}

/* ---------- 03 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: var(--font-body-size);
  line-height: 1.8;
  color: var(--c-taupe);
  background-color: var(--c-black);
  background-image:
    linear-gradient(rgba(201,160,99,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245,241,232,.016) 1px, transparent 1px);
  background-size: 32px 32px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main { display: block; flex: 1 0 auto; }
#main-content, .main-content { scroll-margin-top: 5rem; }
#main-content:focus, .main-content:focus { outline: none; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.25;
  color: var(--c-black);
}

::selection { background: var(--c-red); color: var(--c-paper); }
a { transition: color .18s ease; }

:focus { outline: none; }
:focus-visible { outline: 2px solid var(--c-blue); outline-offset: 2px; }

/* ---------- 04 布局基础 ---------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--space-7); }

.section--dark {
  background-color: var(--c-black);
  color: rgba(245,241,232,.74);
}
.section--dark .section-title { color: var(--c-paper); }
.section--dark .section-intro { color: rgba(245,241,232,.62); }

.section--paper {
  background-color: var(--c-paper);
  background-image:
    linear-gradient(90deg, rgba(17,16,15,.018) 1px, transparent 1px),
    linear-gradient(rgba(17,16,15,.018) 1px, transparent 1px);
  background-size: 32px 32px;
}
.section--paper .section-intro { color: var(--c-taupe); }

.section--red {
  background-color: var(--c-red);
  color: rgba(245,241,232,.92);
}
.section--red .section-title { color: var(--c-paper); }
.section--red .section-intro { color: rgba(245,241,232,.78); }
.section--red .section-kicker { color: var(--c-gold); }
.section--red .section-kicker::before { background: var(--c-paper); }

.section-head { max-width: 760px; margin-bottom: var(--space-5); }

.section-kicker {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-red);
  margin-bottom: .6rem;
}
.section-kicker::before { content: ""; width: 24px; height: 2px; background: var(--c-gold); flex: 0 0 auto; }

.section-title {
  font-size: var(--font-h2);
  margin-bottom: .75rem;
}

.section-intro { font-size: .95rem; line-height: 1.8; max-width: 62ch; }

.divider { height: 1px; border: 0; background: rgba(76,70,67,.15); }
.divider--gold { height: 2px; background: linear-gradient(90deg, var(--c-gold), rgba(201,160,99,.1)); }
.section--dark .divider { background: rgba(245,241,232,.12); }

/* ---------- 05 栅格 ---------- */
.grid { display: grid; grid-template-columns: 1fr; gap: var(--space-4); }

@media (min-width: 680px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 900px) {
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

.grid12 { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--space-4); }
.grid12 > .span-4 { grid-column: span 4; }
.grid12 > .span-5 { grid-column: span 5; }
.grid12 > .span-6 { grid-column: span 6; }
.grid12 > .span-7 { grid-column: span 7; }
.grid12 > .span-8 { grid-column: span 8; }
.grid12 > .span-12 { grid-column: span 12; }
@media (max-width: 900px) {
  .grid12 > .span-4, .grid12 > .span-5, .grid12 > .span-6,
  .grid12 > .span-7, .grid12 > .span-8 { grid-column: span 12; }
}

/* ---------- 06 Skip link ---------- */
.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 2000;
  background: var(--c-red);
  color: var(--c-paper);
  padding: .75rem 1.25rem;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .1em;
  text-decoration: none;
  transition: top .2s ease;
}
.skip-link:focus { top: 1rem; }

/* ---------- 07 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--c-paper);
  background-image:
    linear-gradient(90deg, rgba(17,16,15,.018) 1px, transparent 1px),
    linear-gradient(rgba(17,16,15,.018) 1px, transparent 1px);
  background-size: 40px 40px;
  border-bottom: 3px solid var(--c-red);
  transition: box-shadow .25s ease;
}
.site-header.is-scrolled { box-shadow: 0 10px 30px -12px rgba(17,16,15,.45); }

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 2rem;
  padding-inline: var(--gutter);
  background-color: var(--c-black);
  background-image: linear-gradient(90deg, rgba(201,160,99,.06) 1px, transparent 1px);
  background-size: 32px 100%;
  border-bottom: 1px solid rgba(201,160,99,.25);
  color: rgba(245,241,232,.72);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  white-space: nowrap;
}
.header-top__meta { display: flex; align-items: center; gap: .75rem; min-width: 0; overflow: hidden; }
.header-top__sep { width: 1px; height: .9em; background: rgba(201,160,99,.35); flex: 0 0 auto; }
.header-top__index { margin: 0; color: var(--c-gold); font-size: .68rem; flex: 0 0 auto; }

.header-main {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .75rem 2rem;
  padding-inline: var(--gutter);
  padding-block: .9rem;
  transition: padding-block .25s ease;
}
.site-header.is-scrolled .header-main { padding-block: .55rem; }

.brand { display: inline-flex; align-items: center; gap: .875rem; margin-right: auto; text-decoration: none; }
.brand__mark {
  position: relative;
  width: 44px;
  height: 44px;
  background: var(--c-red);
  color: var(--c-paper);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.55rem;
  line-height: 1;
  display: grid;
  place-items: center;
}
.brand__mark::after {
  content: "";
  position: absolute;
  right: -6px;
  bottom: -6px;
  width: 10px;
  height: 10px;
  background: var(--c-gold);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.25; min-width: 0; }
.brand__line1 { font-family: var(--font-head); font-size: 1.35rem; font-weight: 700; color: var(--c-black); letter-spacing: .02em; white-space: nowrap; }
.brand__zh { color: var(--c-black); }
.brand__en { color: var(--c-red); margin: 0 .06em; }
.brand__line2 { font-family: var(--font-mono); font-size: .64rem; letter-spacing: .18em; text-transform: uppercase; color: var(--c-taupe); margin-top: 3px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.nav-toggle { display: none; }

.site-nav[data-nav] { margin-left: auto; transition: max-height .3s ease; }
.nav-list { display: flex; align-items: center; margin: 0; padding: 0; }
.nav-item { position: relative; }
.nav-item + .nav-item { border-left: 1px solid var(--c-mist); }
.nav-link {
  display: flex;
  align-items: center;
  gap: .4rem;
  padding: .6rem 1.05rem;
  background: transparent;
  border-bottom: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--c-taupe);
  text-decoration: none;
  transition: color .18s ease, background-color .18s ease, border-color .18s ease;
}
.nav-link__index { color: var(--c-darkgold); font-size: .6rem; transition: color .18s ease; }
.nav-link:hover { color: var(--c-red); background-color: rgba(166,25,46,.05); }
.nav-link[aria-current="page"],
.nav-link[aria-current="true"] {
  color: var(--c-red);
  background: rgba(166,25,46,.06);
  border-bottom-color: var(--c-red);
}
.nav-link[aria-current="page"] .nav-link__index,
.nav-link[aria-current="true"] .nav-link__index { color: var(--c-red); }

.header-progress {
  position: absolute;
  bottom: -3px;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--c-gold);
  pointer-events: none;
  z-index: 2;
}

/* ---------- 08 页脚 ---------- */
.site-footer {
  position: relative;
  background-color: var(--c-black);
  background-image:
    linear-gradient(rgba(201,160,99,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201,160,99,.018) 1px, transparent 1px);
  background-size: 40px 40px;
  color: rgba(245,241,232,.72);
  margin-top: auto;
}

.footer-ribbon { position: relative; height: 2px; background: var(--c-gold); }
.footer-ribbon::after {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 96px;
  height: 4px;
  background: var(--c-red);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem 3rem;
  padding-block: 3rem 2rem;
}
@media (min-width: 641px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand-block { grid-column: 1 / -1; }
}
@media (min-width: 1025px) {
  .footer-grid { grid-template-columns: 1.5fr .8fr 1.1fr; }
  .footer-brand-block { grid-column: auto; }
}

.footer-kicker { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .22em; text-transform: uppercase; color: var(--c-gold); margin-bottom: .5rem; }
.footer-brand { font-family: var(--font-head); font-size: clamp(1.6rem, 2.6vw, 2.2rem); color: var(--c-paper); line-height: 1.2; }
.footer-brand__highlight { color: var(--c-red); }
.footer-sub { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .14em; color: rgba(245,241,232,.55); margin-bottom: 1.25rem; }
.footer-trust {
  max-width: 52ch;
  font-size: .78rem;
  line-height: 1.8;
  color: rgba(245,241,232,.6);
  border-left: 2px solid rgba(166,25,46,.7);
  padding-left: 1rem;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 400;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: 1rem;
}
.footer-heading::before { content: ""; width: 10px; height: 10px; background: var(--c-red); flex: 0 0 auto; }

.footer-list { margin: 0; padding: 0; }
.footer-link {
  display: inline-flex;
  align-items: baseline;
  padding: .35rem 0;
  font-size: .9rem;
  color: rgba(245,241,232,.72);
  text-decoration: none;
  transition: color .18s ease;
}
.footer-link::before { content: "»"; margin-right: .55rem; color: var(--c-darkgold); font-family: var(--font-mono); font-size: .75rem; }
.footer-link:hover { color: var(--c-gold); }

.footer-contact { margin: 0; padding: 0; font-size: .88rem; line-height: 1.8; color: rgba(245,241,232,.72); }
.footer-contact__item { overflow-wrap: anywhere; }
.footer-contact__item + .footer-contact__item { margin-top: .4rem; }

.footer-bottom { border-top: 1px solid rgba(245,241,232,.1); padding-block: 1.25rem; }
.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 2rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  color: rgba(245,241,232,.45);
}
.footer-copy { margin: 0; }
.footer-icp { margin: 0; }

.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.5rem;
  z-index: 900;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(76,70,67,.4);
  background: var(--c-paper);
  color: var(--c-red);
  font-size: 1.1rem;
  line-height: 1;
  box-shadow: 0 6px 16px rgba(0,0,0,.18);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity .25s ease, transform .25s ease, background-color .2s ease, color .2s ease;
}
.back-to-top.is-visible { opacity: 1; pointer-events: auto; transform: none; }
.back-to-top:hover { background: var(--c-red); color: var(--c-paper); }

/* ---------- 09 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .8rem 1.5rem;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.btn:active { transform: translateY(1px); box-shadow: inset 0 2px 4px rgba(0,0,0,.12); }
.btn--red { background: var(--c-red); border-color: var(--c-red); color: var(--c-paper); }
.btn--red:hover { background: var(--c-rust); border-color: var(--c-rust); }
.btn--gold { background: var(--c-gold); border-color: var(--c-gold); color: var(--c-black); }
.btn--gold:hover { background: var(--c-darkgold); border-color: var(--c-darkgold); color: var(--c-paper); }
.btn--ghost { border-color: rgba(245,241,232,.35); color: var(--c-paper); }
.btn--ghost:hover { border-color: var(--c-gold); color: var(--c-gold); }
.btn--line { border-color: var(--c-taupe); color: var(--c-taupe); }
.btn--line:hover { border-color: var(--c-red); color: var(--c-red); }

/* ---------- 10 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-taupe);
}
.breadcrumb li { display: flex; align-items: center; }
.breadcrumb li + li::before { content: "/"; margin-right: .5rem; color: var(--c-darkgold); }
.breadcrumb a { color: var(--c-taupe); text-decoration: none; }
.breadcrumb a:hover { color: var(--c-red); }
.breadcrumb li[aria-current="page"] { color: var(--c-red); }
.section--dark .breadcrumb { color: rgba(245,241,232,.55); }
.section--dark .breadcrumb a { color: rgba(245,241,232,.65); }
.section--dark .breadcrumb a:hover { color: var(--c-gold); }
.section--dark .breadcrumb li[aria-current="page"] { color: var(--c-gold); }

/* ---------- 11 页头横幅 ---------- */
.page-header {
  position: relative;
  overflow: hidden;
  background-color: var(--c-black);
  background-image:
    linear-gradient(rgba(201,160,99,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245,241,232,.02) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--c-paper);
  border-bottom: 1px solid rgba(201,160,99,.25);
  padding-block: clamp(3rem, 7vw, 5.5rem);
}
.page-header::before {
  content: attr(data-index);
  position: absolute;
  right: clamp(1rem, 4vw, 3.5rem);
  top: .75rem;
  font-family: var(--font-mono);
  font-size: clamp(3rem, 8vw, 6rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(201,160,99,.18);
  pointer-events: none;
  user-select: none;
}
.page-header__inner { position: relative; z-index: 1; }
.page-header__kicker {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: .5rem;
}
.page-header__kicker::before { content: ""; width: 24px; height: 2px; background: var(--c-red); flex: 0 0 auto; }
.page-header__title { font-size: clamp(2rem, 5vw, 3.5rem); color: var(--c-paper); margin-bottom: .75rem; }
.page-header__title em { color: var(--c-gold); font-style: normal; }
.page-header__desc { max-width: 640px; color: rgba(245,241,232,.7); line-height: 1.8; }
.page-header__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1.5rem;
  margin-top: 1.25rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  color: var(--c-gold);
}

/* ---------- 12 档案卡 ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: var(--c-paper);
  border: 1px solid rgba(76,70,67,.2);
  border-top: 3px solid var(--c-red);
  transition: transform .2s ease, box-shadow .2s ease, border-top-color .2s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-top-color: var(--c-gold);
}

.card--dark {
  background: rgba(17,16,15,.62);
  border-color: rgba(245,241,232,.14);
  border-top-color: var(--c-gold);
  color: rgba(245,241,232,.74);
}
.card--dark:hover { box-shadow: 0 14px 28px -14px rgba(0,0,0,.6); }
.card--dark .card__title { color: var(--c-paper); }
.card--dark .card__text { color: rgba(245,241,232,.62); }
.card--dark .card__meta { color: var(--c-gold); }
.card--dark .card__link { color: var(--c-gold); border-top-color: rgba(245,241,232,.14); }
.card--dark .card__link:hover { color: var(--c-paper); }

.card__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .6rem;
  margin-bottom: .75rem;
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-darkgold);
}
.card__index { color: var(--c-red); }

.card__title { font-size: var(--font-card); margin-bottom: .6rem; line-height: 1.35; }
.card__text { font-size: .88rem; line-height: 1.75; color: var(--c-taupe); margin-bottom: 1rem; }
.card__link {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin-top: auto;
  padding-top: .75rem;
  border-top: 1px solid rgba(76,70,67,.12);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  color: var(--c-red);
  text-decoration: none;
}
.card__link::after { content: "→"; transition: transform .18s ease; }
.card__link:hover { color: var(--c-darkgold); }
.card__link:hover::after { transform: translateX(4px); }

.card__media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--c-ink);
  border-bottom: 3px solid var(--c-gold);
  margin: -1.5rem -1.5rem 1.25rem;
}
.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(.4) contrast(1.05);
  transition: filter .3s ease, transform .6s ease;
}
.card:hover .card__media img { filter: grayscale(0) contrast(1); transform: scale(1.02); }
.card__media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(rgba(201,160,99,.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201,160,99,.1) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  transition: opacity .3s ease;
}
.card:hover .card__media::after { opacity: .45; }
.card__media[data-caption]::before {
  content: attr(data-caption);
  position: absolute;
  left: .75rem;
  bottom: .5rem;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .14em;
  color: var(--c-gold);
  background: rgba(17,16,15,.55);
  padding: .18rem .45rem;
  border: 1px solid rgba(201,160,99,.35);
}

/* ---------- 13 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .22rem .55rem;
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .12em;
  line-height: 1.4;
  color: var(--c-taupe);
  background: var(--c-mist);
  border: 1px solid transparent;
}
.tag--red { background: rgba(166,25,46,.08); color: var(--c-red); border-color: rgba(166,25,46,.25); }
.tag--gold { background: rgba(201,160,99,.1); color: var(--c-darkgold); border-color: rgba(201,160,99,.35); }
.tag--dark { background: transparent; color: rgba(245,241,232,.75); border-color: rgba(245,241,232,.25); }

/* ---------- 14 档案编目 ---------- */
.index-list { margin: 0; padding: 0; border-top: 1px solid rgba(76,70,67,.18); }
.index-list__item {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  padding: .9rem 0;
  border-bottom: 1px solid rgba(76,70,67,.18);
}
.index-list__num { font-family: var(--font-mono); font-size: .72rem; color: var(--c-gold); flex: 0 0 auto; }
.index-list__link { font-family: var(--font-head); font-size: 1.05rem; color: var(--c-black); text-decoration: none; }
.index-list__link:hover { color: var(--c-red); }

/* ---------- 15 时间轴 ---------- */
.timeline { position: relative; margin: 0; padding: 0; }
.timeline::before {
  content: "";
  position: absolute;
  left: 6rem;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--c-gold), rgba(201,160,99,.15));
}
.timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 1.5rem;
  padding: 1rem 0;
}
.timeline__year {
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--c-gold);
  text-align: right;
  padding-right: 2rem;
  position: relative;
  transition: color .18s ease;
}
.timeline__year::after {
  content: "";
  position: absolute;
  right: -4px;
  top: .2em;
  width: 8px;
  height: 8px;
  background: var(--c-gold);
  transition: background-color .18s ease;
}
.timeline__item:hover .timeline__year { color: var(--c-red); }
.timeline__item:hover .timeline__year::after { background: var(--c-red); }
.timeline__content { padding-bottom: 1rem; }

@media (max-width: 640px) {
  .timeline::before { left: .75rem; }
  .timeline__item { grid-template-columns: 1fr; gap: .25rem; padding-left: 1.75rem; }
  .timeline__year { text-align: left; padding-right: 0; }
  .timeline__year::after { left: -1.45rem; right: auto; }
}

/* ---------- 16 数据表格 ---------- */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--c-paper);
  font-size: .85rem;
  min-width: 560px;
}
.data-table th,
.data-table td { border-bottom: 1px solid rgba(76,70,67,.14); border-right: 1px solid rgba(76,70,67,.07); padding: .7rem .9rem; text-align: left; }
.data-table th {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  background: var(--c-black);
  color: var(--c-paper);
}
.data-table td.num { font-family: var(--font-mono); color: var(--c-black); }

/* ---------- 17 表单 ---------- */
.field { display: flex; flex-direction: column; gap: .45rem; margin-bottom: 1.25rem; max-width: 640px; }
.field__label { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .12em; color: var(--c-taupe); }
.field__input,
.field__textarea,
.field__select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--c-paper);
  border: 1px solid rgba(76,70,67,.3);
  border-radius: 0;
  padding: .7rem .9rem;
  font-family: var(--font-body);
  font-size: .9rem;
  color: var(--c-black);
  transition: border-color .2s ease, box-shadow .2s ease;
}
.field__textarea { min-height: 8rem; resize: vertical; }
.field__input:focus,
.field__textarea:focus,
.field__select:focus { border-color: var(--c-red); box-shadow: 0 0 0 2px rgba(166,25,46,.15); }
.field.is-error .field__input { border-color: var(--c-red); }
.field__hint { font-size: .75rem; color: var(--c-taupe); }
.field__hint.is-error { color: var(--c-red); }

/* ---------- 18 选项卡 ---------- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--c-taupe);
}
.tab-button {
  appearance: none;
  -webkit-appearance: none;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: .7rem 1.1rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--c-taupe);
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease;
}
.tab-button:hover { color: var(--c-red); }
.tab-button[aria-selected="true"] { color: var(--c-red); border-bottom-color: var(--c-red); }

/* ---------- 19 正文排版 ---------- */
.prose {
  background: var(--c-paper);
  color: var(--c-taupe);
  padding: clamp(1.5rem, 4vw, 3.5rem);
  border: 1px solid rgba(76,70,67,.15);
  box-shadow: 0 12px 30px -18px rgba(17,16,15,.4);
  font-size: .95rem;
}
.prose > * + * { margin-top: 1.25em; }
.prose h2 { font-size: 1.5rem; color: var(--c-black); border-left: 4px solid var(--c-red); padding-left: .75rem; margin-top: 2em; }
.prose h3 { font-size: 1.15rem; color: var(--c-black); margin-top: 1.5em; }
.prose p { line-height: 1.9; }
.prose a { color: var(--c-red); text-decoration-thickness: 1px; }
.prose a:hover { color: var(--c-rust); }
.prose blockquote { margin: 0; padding-left: 1.25rem; border-left: 3px solid var(--c-gold); color: var(--c-taupe); }
.prose ul:not([class]),
.prose ol:not([class]) { margin: 1.25em 0; padding-left: 1.5em; }
.prose li { margin-bottom: .5em; }
.prose img { margin-block: 1.5rem; border: 1px solid rgba(76,70,67,.18); }
.prose code {
  font-family: var(--font-mono);
  font-size: .85em;
  background: rgba(76,70,67,.08);
  padding: .15em .4em;
}

/* ---------- 20 通用媒体容器 ---------- */
.media { position: relative; overflow: hidden; background: var(--c-ink); border: 1px solid rgba(201,160,99,.25); }
.media img { width: 100%; height: 100%; object-fit: cover; }
.media[data-caption]::after {
  content: attr(data-caption);
  position: absolute;
  left: .75rem;
  bottom: .5rem;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .14em;
  color: var(--c-gold);
  background: rgba(17,16,15,.55);
  padding: .18rem .45rem;
  border: 1px solid rgba(201,160,99,.35);
}

/* ---------- 21 滚动显现 ---------- */
.reveal { transition: opacity .5s ease, transform .5s ease; }
.reveal.is-hidden { opacity: 0; transform: translateY(18px); }
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 22 响应式：页头与导航 ---------- */
@media (max-width: 959px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    margin-left: auto;
    padding: .45rem .8rem;
    border: 1px solid var(--c-taupe);
    font-family: var(--font-mono);
    font-size: .66rem;
    letter-spacing: .16em;
    color: var(--c-taupe);
    transition: border-color .2s ease, color .2s ease, background-color .2s ease;
  }
  .nav-toggle:hover { border-color: var(--c-red); color: var(--c-red); }
  .nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3px; width: 16px; }
  .nav-toggle__bar { display: block; height: 1.5px; background: var(--c-black); transition: transform .2s ease, opacity .2s ease; }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-4.5px) rotate(-45deg); }

  .site-nav[data-nav] {
    flex-basis: 100%;
    order: 3;
    margin-left: 0;
    max-height: none;
    overflow: hidden;
  }
  .site-nav[data-nav].is-closed { max-height: 0; border-top: 0; }
  .site-nav[data-nav][data-open] {
    max-height: calc(100vh - 3.5rem);
    overflow-y: auto;
    border-top: 1px solid var(--c-mist);
  }
  .nav-list { flex-direction: column; align-items: stretch; }
  .nav-item + .nav-item { border-left: none; border-top: 1px solid var(--c-mist); }
  .nav-link {
    justify-content: space-between;
    padding: .95rem .25rem;
    font-size: .78rem;
    border-bottom: none;
  }
  .brand__line1 { font-size: 1.1rem; }
  .brand__mark { width: 38px; height: 38px; font-size: 1.3rem; }
}

@media (max-width: 560px) {
  .header-top { font-size: .62rem; }
  .header-top__zh,
  .header-top__zh + .header-top__sep { display: none; }
  .header-top__index { display: none; }
  .brand__line2 { max-width: 42vw; }
}

/* ---------- 23 减少动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    transition-delay: 0s !important;
  }
  .reveal.is-hidden { opacity: 1; transform: none; }
  .card__media img { filter: none; }
  .card:hover .card__media img { transform: none; }
}