/* ==========================================================================
   金博中心 · /assets/site.css
   共享外壳：档案式双层页头、四段式页脚、基础组件与图片容器规则
   ========================================================================== */

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

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

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

ul, ol { padding: 0; }
ul[class], ol[class] { list-style: none; }

img, svg, video, canvas { display: block; max-width: 100%; height: auto; }

a { color: inherit; text-decoration: none; }

button, input, textarea, select { font: inherit; color: inherit; }

button { border: 0; background: none; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--copper-light);
  outline-offset: 3px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0E1B33;
  --ink-deep: #091224;
  --ink-mid: #13294B;
  --ink-soft: #24446F;
  --copper: #B47A3C;
  --copper-light: #D9AF79;
  --paper: #F7F3EC;
  --paper-soft: #EFE8DC;
  --warm-gray: #DED7CB;
  --stone: #8B8478;
  --red: #7E2F34;
  --glass: rgba(255, 255, 255, 0.12);
  --line: rgba(14, 27, 51, 0.16);
  --line-strong: rgba(14, 27, 51, 0.34);
  --line-light: rgba(247, 243, 236, 0.16);

  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, "SimSun", serif;
  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --gutter: clamp(18px, 4.2vw, 64px);
  --shell-max: 1320px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --shadow-card: 0 24px 50px -34px rgba(14, 27, 51, 0.6);
}

/* ---------- 3. 中文排版基线 ---------- */
body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-mid);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (min-width: 1024px) {
  body { font-size: 17px; }
}

::selection {
  background: var(--copper);
  color: #0A1426;
}

.display {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(56px, 9vw, 156px);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(30px, 4.4vw, 60px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.4;
  color: var(--ink);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--copper);
}

.eyebrow::before {
  content: "";
  display: block;
  width: 22px;
  height: 1px;
  background: var(--copper);
}

.lede {
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.85;
  color: var(--ink-mid);
  max-width: 38em;
}

.prose { max-width: 40em; }
.prose p + p { margin-top: 1em; }

.mono {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

/* ---------- 4. 布局容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(56px, 8vw, 120px); }
.section--tight { padding-block: clamp(36px, 5vw, 72px); }
.section--paper { background: var(--paper); }
.section--stone { background: var(--warm-gray); }

.section--ink {
  background: var(--ink);
  color: var(--paper);
}

.section--ink .display,
.section--ink .h2,
.section--ink .h3 { color: var(--paper); }

.section--ink .lede { color: rgba(247, 243, 236, 0.78); }
.section--ink .eyebrow { color: var(--copper-light); }
.section--ink .eyebrow::before { background: var(--copper-light); }

.section-head {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: clamp(28px, 4vw, 56px);
}

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(24px, 4vw, 48px);
  background: var(--line);
}

.rule--copper {
  background: linear-gradient(90deg, var(--copper) 0%, rgba(180, 122, 60, 0) 100%);
}

/* ---------- 5. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 980px) {
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 6. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.06em;
  border: 1px solid transparent;
  border-radius: 0;
  cursor: pointer;
  transition: background 0.25s var(--ease), color 0.25s var(--ease),
    border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.btn--copper {
  background: var(--copper);
  border-color: var(--copper-light);
  color: #0A1426;
}

.btn--copper:hover,
.btn--copper:focus-visible {
  background: var(--copper-light);
  border-color: var(--copper-light);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(247, 243, 236, 0.35);
  color: var(--paper);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--copper-light);
  color: var(--copper-light);
}

.btn--ink {
  background: var(--ink-mid);
  border-color: var(--ink-mid);
  color: var(--paper);
}

.btn--ink:hover,
.btn--ink:focus-visible {
  background: var(--ink);
  border-color: var(--copper);
}

.btn--line {
  background: transparent;
  border-color: var(--copper);
  color: var(--ink-mid);
}

.btn--line:hover,
.btn--line:focus-visible {
  background: rgba(180, 122, 60, 0.12);
  border-color: var(--copper);
}

.btn--sm {
  padding: 9px 16px;
  font-size: 13px;
}

/* ---------- 7. 卡片 / 色签 / 玻璃层 / 批注 ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.card:hover {
  border-color: var(--copper);
  transform: translateY(-3px);
}

.card__label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper);
}

.card__title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.4;
  color: var(--ink);
}

.card__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-mid);
  opacity: 0.82;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 11px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  border: 1px solid var(--copper);
  background: transparent;
  color: var(--ink-mid);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.tag::before {
  content: "";
  width: 7px;
  height: 7px;
  background: currentColor;
  transform: rotate(45deg);
  flex: 0 0 auto;
}

.tag:hover { border-color: var(--copper-light); }

.tag--1 { color: #24446F; background: rgba(36, 68, 111, 0.10); }
.tag--2 { color: #7E2F34; background: rgba(126, 47, 52, 0.10); }
.tag--3 { color: #4C5B3C; background: rgba(76, 91, 60, 0.12); }
.tag--4 { color: #8A6A2F; background: rgba(180, 122, 60, 0.14); }
.tag--5 { color: #3F5A5E; background: rgba(63, 90, 94, 0.12); }
.tag--6 { color: #5B4A63; background: rgba(91, 74, 99, 0.12); }

.glass {
  position: relative;
  padding: clamp(20px, 3vw, 36px);
  background: var(--glass);
  border: 1px solid rgba(217, 175, 121, 0.42);
  color: var(--paper);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  backdrop-filter: blur(14px) saturate(120%);
}

.glass--light {
  background: rgba(255, 255, 255, 0.62);
  border-color: rgba(180, 122, 60, 0.34);
  color: var(--ink-mid);
}

.note {
  display: block;
  padding: 14px 18px;
  border-left: 3px solid var(--copper);
  background: rgba(180, 122, 60, 0.09);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-mid);
}

.note--flag {
  border-left-color: var(--red);
  background: rgba(126, 47, 52, 0.08);
}

/* ---------- 8. 图片容器（页面阶段放占位图） ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--warm-gray);
  background-image:
    repeating-linear-gradient(0deg, rgba(19, 41, 75, 0.07) 0 1px, transparent 1px 26px),
    repeating-linear-gradient(90deg, rgba(19, 41, 75, 0.07) 0 1px, transparent 1px 26px);
  border: 1px solid var(--line);
}

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.04);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(14, 27, 51, 0) 45%, rgba(14, 27, 51, 0.38) 100%);
  pointer-events: none;
}

.media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 8px 12px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--paper);
  background: rgba(14, 27, 51, 0.72);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.media__mark {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  padding: 3px 7px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--copper-light);
  border: 1px solid rgba(217, 175, 121, 0.6);
  background: rgba(14, 27, 51, 0.45);
}

.media__placeholder {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  padding: 12px;
  text-align: center;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: rgba(19, 41, 75, 0.42);
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--3x4 { aspect-ratio: 3 / 4; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }
.media--bleed { border: 0; }

/* ---------- 9. 面包屑 / 箭头链接 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--stone);
}

.breadcrumb a {
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--copper);
  border-bottom-color: var(--copper);
}

.breadcrumb__sep { color: var(--copper); }

.breadcrumb [aria-current="page"] { color: var(--ink-mid); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 3px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--copper);
  border-bottom: 1px solid rgba(180, 122, 60, 0.4);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), gap 0.25s var(--ease);
}

.link-arrow::after {
  content: "\2192";
  font-family: var(--mono);
  transition: transform 0.25s var(--ease);
}

.link-arrow:hover,
.link-arrow:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
  gap: 14px;
}

/* ---------- 10. 工具类与滚动显现 ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: no-preference) {
  [data-reveal="pending"] {
    opacity: 0;
    transform: translateY(18px);
  }

  [data-reveal="in"] {
    opacity: 1;
    transform: none;
    transition: opacity 0.42s var(--ease), transform 0.42s var(--ease);
  }
}

/* ---------- 11. 页头 ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -72px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--copper);
  color: #0A1426;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.06em;
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  color: var(--paper);
  background:
    radial-gradient(140% 200% at 8% -20%, #1D3559 0%, rgba(29, 53, 89, 0) 58%),
    linear-gradient(180deg, #0E1B33 0%, #0A1426 100%);
  border-bottom: 1px solid rgba(217, 175, 121, 0.26);
  box-shadow: 0 18px 40px -34px rgba(9, 18, 36, 0.9);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--copper) 0%, var(--copper-light) 100%);
  pointer-events: none;
}

.masthead {
  border-bottom: 1px solid rgba(247, 243, 236, 0.09);
}

.masthead__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.2vw, 34px);
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(12px, 1.6vw, 20px) var(--gutter);
  transition: padding 0.3s var(--ease);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: var(--paper);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  border: 1px solid var(--copper);
  background: linear-gradient(140deg, rgba(180, 122, 60, 0.32), rgba(180, 122, 60, 0));
  color: var(--copper-light);
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  line-height: 1;
  transition: width 0.3s var(--ease), height 0.3s var(--ease), font-size 0.3s var(--ease);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.brand__name {
  font-family: var(--serif);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.16em;
  color: var(--paper);
}

.brand__tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--copper-light);
}

.index-rail {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 28px);
  min-width: 0;
  margin-left: clamp(4px, 1vw, 18px);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: rgba(247, 243, 236, 0.6);
}

.index-rail__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.index-rail__item::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: 0 0 auto;
  background: var(--copper);
  transform: rotate(45deg);
}

.masthead__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.version-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid rgba(217, 175, 121, 0.35);
  background: rgba(255, 255, 255, 0.06);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: rgba(247, 243, 236, 0.7);
  white-space: nowrap;
}

.version-chip b {
  font-weight: 500;
  color: var(--copper-light);
}

.version-dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 3px rgba(126, 47, 52, 0.28);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid rgba(217, 175, 121, 0.4);
  background: rgba(255, 255, 255, 0.04);
  color: var(--paper);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.3s var(--ease), top 0.3s var(--ease);
}

.nav-toggle__bars::before { top: 2px; }
.nav-toggle__bars::after { top: 9px; }

[data-nav-toggle][aria-expanded="true"] .nav-toggle__bars::before {
  top: 5.5px;
  transform: rotate(45deg);
}

[data-nav-toggle][aria-expanded="true"] .nav-toggle__bars::after {
  top: 5.5px;
  transform: rotate(-45deg);
}

.nav-toggle__label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.primary-nav {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.primary-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: clamp(6px, 1.6vw, 30px);
  border-top: 1px solid rgba(247, 243, 236, 0.08);
}

.primary-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 14px 0 15px;
  font-family: var(--serif);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: rgba(247, 243, 236, 0.78);
  transition: color 0.25s var(--ease), padding 0.3s var(--ease);
}

.primary-nav__index {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--copper);
}

.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--copper-light);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.primary-nav__link:hover,
.primary-nav__link:focus-visible { color: #FFFFFF; }

.primary-nav__link:hover::after,
.primary-nav__link:focus-visible::after { transform: scaleX(1); }

.primary-nav__link[aria-current="page"] { color: #FFFFFF; }

.primary-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--copper);
}

.primary-nav__link[aria-current="page"] .primary-nav__index {
  color: var(--copper-light);
}

@media (max-width: 899px) {
  .index-rail { display: none; }
  .version-chip { display: none; }

  .nav-toggle { display: inline-flex; }

  .primary-nav {
    max-height: 0;
    overflow: hidden;
    padding-block: 0;
    transition: max-height 0.38s var(--ease);
  }

  .primary-nav[data-open] {
    max-height: min(72vh, 520px);
    overflow-y: auto;
    padding-bottom: 10px;
  }

  .primary-nav__list {
    display: block;
    border-top: 0;
  }

  .primary-nav__list > li + li {
    border-top: 1px solid rgba(247, 243, 236, 0.09);
  }

  .primary-nav__link {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 16px 0;
    font-size: 16px;
  }

  .primary-nav__link::after { display: none; }

  .primary-nav__link[aria-current="page"] {
    color: var(--copper-light);
    padding-left: 12px;
    border-left: 2px solid var(--copper);
  }
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }

  .primary-nav {
    max-height: none;
    overflow: visible;
  }
}

.site-header[data-compact] .masthead__inner { padding-block: 8px; }
.site-header[data-compact] .brand__mark { width: 34px; height: 34px; font-size: 16px; }
.site-header[data-compact] .primary-nav__link { padding-block: 10px; }

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  background: linear-gradient(180deg, #0E1B33 0%, #0A1426 100%);
  border-top: 1px solid rgba(217, 175, 121, 0.3);
  color: rgba(247, 243, 236, 0.78);
  padding-top: clamp(44px, 6vw, 80px);
}

.footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 64px);
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

@media (min-width: 880px) {
  .footer__inner {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.25fr);
  }
}

.footer__brand { min-width: 0; }

.footer__logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
}

.footer__logo-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  border: 1px solid var(--copper);
  background: linear-gradient(140deg, rgba(180, 122, 60, 0.3), rgba(180, 122, 60, 0));
  color: var(--copper-light);
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
}

.footer__logo-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.14em;
}

.footer__logo-sub {
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 400;
  letter-spacing: 0.22em;
  color: rgba(247, 243, 236, 0.45);
}

.footer__statement {
  max-width: 32ch;
  margin-top: 22px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 243, 236, 0.72);
}

.footer__note {
  max-width: 34ch;
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.9;
  letter-spacing: 0.06em;
  color: rgba(247, 243, 236, 0.5);
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

@media (max-width: 640px) {
  .footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.footer__col { min-width: 0; }

.footer__col-title {
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(247, 243, 236, 0.14);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--copper-light);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

.footer__link {
  display: inline-block;
  font-size: 14.5px;
  color: rgba(247, 243, 236, 0.76);
  transition: color 0.25s var(--ease), letter-spacing 0.25s var(--ease);
}

.footer__link:hover,
.footer__link:focus-visible {
  color: var(--copper-light);
  letter-spacing: 0.06em;
}

.footer__contact {
  margin-top: clamp(32px, 4.5vw, 64px);
  border-top: 1px solid rgba(247, 243, 236, 0.12);
  border-bottom: 1px solid rgba(247, 243, 236, 0.12);
  background: rgba(255, 255, 255, 0.03);
}

.footer__contact-inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 36px;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(18px, 2.4vw, 28px) var(--gutter);
}

.footer__contact-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
}

.footer__contact-item--wide { grid-column: 1 / -1; }

.footer__contact-label {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--copper);
}

.footer__contact-value {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(247, 243, 236, 0.85);
  overflow-wrap: anywhere;
}

@media (min-width: 960px) {
  .footer__contact-inner {
    grid-template-columns: auto auto minmax(0, 1fr);
  }

  .footer__contact-item--wide { grid-column: auto; }
}

@media (max-width: 559px) {
  .footer__contact-inner { grid-template-columns: minmax(0, 1fr); }
  .footer__contact-item--wide { grid-column: auto; }
}

.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 20px var(--gutter) clamp(24px, 3vw, 34px);
}

.footer__legal,
.footer__copy {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(247, 243, 236, 0.5);
}

/* ---------- 13. 减少动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .card:hover { transform: none; }
}