/* ==========================================================================
   中欧体育 · 共享样式表 /assets/site.css
   夜馆炭黑 · 深墨绿 · 熔金 · 目录型内容地图
   ========================================================================== */

/* ---------- 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, figure, blockquote, dl, dd, pre {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

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

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

button {
  background: none;
  border: 0;
}

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

table {
  border-collapse: collapse;
  width: 100%;
}

[id] {
  scroll-margin-top: 84px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0D1110;
  --ink-2: #132A24;
  --ink-3: #0A0F0E;
  --moss: #3C5A48;
  --stone: #6E766C;
  --silver: #C9CFC9;
  --bone: #F1ECE1;
  --gold: #C9A227;
  --gold-lt: #E0C471;
  --clay: #B47A5B;
  --brick: #933F32;
  --mineral: #D9D2C3;

  --line: rgba(110, 118, 108, 0.28);
  --line-strong: rgba(110, 118, 108, 0.5);
  --line-gold: rgba(201, 162, 39, 0.42);
  --line-soft: rgba(110, 118, 108, 0.16);

  --font-display: "Oswald", "Archivo Narrow", "Source Han Sans SC", "Noto Sans SC",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Source Serif 4", "Source Serif Pro", "Songti SC", "Noto Serif SC",
    "SimSun", Georgia, serif;
  --font-body: "Inter", "Source Han Sans SC", "Noto Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Mono", "SF Mono", "Menlo", Consolas,
    "Liberation Mono", monospace;

  --gutter: clamp(20px, 4.5vw, 80px);
  --maxw: 1440px;
  --header-h: 92px;
  --header-h-condensed: 64px;

  --radius-sm: 12px;
  --radius: 20px;
  --radius-lg: 28px;
  --radius-pill: 999px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --lift: 0 18px 40px -26px rgba(0, 0, 0, 0.95);
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--silver);
  background-color: var(--ink);
  background-image:
    radial-gradient(1200px 620px at 12% -8%, rgba(19, 42, 36, 0.85), transparent 68%),
    radial-gradient(900px 520px at 96% 4%, rgba(60, 90, 72, 0.16), transparent 70%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.08;
  color: var(--bone);
}

h1 { font-size: clamp(40px, 6vw, 96px); }
h2 { font-size: clamp(28px, 3.4vw, 52px); }
h3 { font-size: clamp(20px, 2.2vw, 30px); }

p { max-width: 74ch; }

::selection {
  background: rgba(201, 162, 39, 0.32);
  color: var(--bone);
}

/* ---------- 4. 可见焦点与无障碍 ---------- */
:focus-visible {
  outline: 2px solid var(--gold-lt);
  outline-offset: 2px;
  border-radius: 4px;
}

#main-content {
  display: block;
  outline: none;
}

#main-content:focus-visible {
  outline: 2px solid var(--gold-lt);
  outline-offset: -4px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 16px;
  z-index: 400;
  display: inline-flex;
  align-items: center;
  padding: 11px 20px;
  border-radius: var(--radius-pill);
  background: var(--gold);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 0 14px 30px -18px rgba(0, 0, 0, 1);
  transform: translateY(calc(-100% - 20px));
  transition: transform 0.18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
}

/* ---------- 5. 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow {
  max-width: 880px;
}

.container--wide {
  max-width: 1680px;
}

.grid {
  display: grid;
  gap: clamp(20px, 2.4vw, 32px);
}

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

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--line-strong), rgba(110, 118, 108, 0.04));
}

.rule--gold {
  background: linear-gradient(90deg, var(--line-gold), rgba(201, 162, 39, 0.04));
}

.data-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.section-head {
  display: grid;
  gap: 14px;
  max-width: 780px;
}

.section-head__eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

.section-head__eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--gold);
  opacity: 0.75;
}

.section-head__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 4vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.section-head__note {
  font-size: 15px;
  color: var(--stone);
}

.lede {
  font-family: var(--font-serif);
  font-size: clamp(19px, 1.6vw, 24px);
  line-height: 1.62;
  color: var(--mineral);
}

/* ---------- 6. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(13, 17, 16, 0.92);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
  color: var(--silver);
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.site-header.is-condensed {
  background: rgba(10, 15, 14, 0.97);
  border-bottom-color: var(--line-gold);
}

.site-header__bar {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.6vw, 26px);
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 10px var(--gutter);
  min-height: var(--header-h);
  transition: min-height 0.2s var(--ease);
}

.site-header.is-condensed .site-header__bar {
  min-height: var(--header-h-condensed);
}

.site-header__lead {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 0 0 auto;
}

.site-header__tail {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* 品牌标识 */
.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  transition: opacity 0.15s var(--ease);
}

.brand-mark:hover { opacity: 0.86; }

.brand-mark__glyph {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: 1px solid var(--line-gold);
  background: linear-gradient(150deg, rgba(60, 90, 72, 0.55), rgba(13, 17, 16, 0.85));
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--gold-lt);
  line-height: 1;
}

.brand-mark__word {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--bone);
  white-space: nowrap;
}

.brand-line {
  font-size: 13px;
  line-height: 1.4;
  color: var(--stone);
  white-space: nowrap;
  max-width: none;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.brand-mark--footer .brand-mark__glyph {
  width: 50px;
  height: 50px;
  border-radius: 16px;
  font-size: 15px;
}

.brand-mark--footer .brand-mark__word {
  font-size: 22px;
}

/* 刻度细线 */
.header-rail {
  position: relative;
  flex: 1 1 40px;
  min-width: 28px;
  height: 12px;
  align-self: center;
}

.header-rail::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 5.5px;
  height: 1px;
  background: linear-gradient(
    90deg,
    rgba(110, 118, 108, 0.1),
    rgba(110, 118, 108, 0.55) 50%,
    rgba(110, 118, 108, 0.1)
  );
}

.header-rail::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 12px;
  background: repeating-linear-gradient(
    90deg,
    rgba(110, 118, 108, 0.42) 0 1px,
    transparent 1px 24px
  );
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent);
  opacity: 0.85;
}

.header-rail__mark {
  position: absolute;
  top: 50%;
  left: 0;
  width: 7px;
  height: 7px;
  margin-top: -3.5px;
  margin-left: -3.5px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, 0.18);
  transform: translateX(var(--rail-x, 0px));
  transition: transform 0.18s linear;
}

/* 导航 */
.site-nav {
  flex: 0 0 auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__item {
  list-style: none;
}

.site-nav__item--split {
  margin-left: 10px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  color: var(--silver);
  transition: color 0.15s var(--ease), background-color 0.15s var(--ease),
    border-color 0.15s var(--ease);
}

.site-nav__link:hover {
  color: var(--bone);
  background: rgba(60, 90, 72, 0.45);
  border-color: var(--line-gold);
}

.site-nav__link[aria-current="page"] {
  color: var(--gold-lt);
  background: rgba(201, 162, 39, 0.09);
  border-color: var(--line-gold);
}

/* 版本标签与快捷入口 */
.version-tag {
  display: inline-flex;
  align-items: center;
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--stone);
  white-space: nowrap;
}

.header-quick {
  display: none;
  align-items: center;
  padding: 8px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-gold);
  background: rgba(201, 162, 39, 0.07);
  color: var(--gold-lt);
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
  transition: color 0.15s var(--ease), background-color 0.15s var(--ease);
}

.header-quick:hover {
  color: var(--bone);
  background: rgba(201, 162, 39, 0.17);
}

@media (min-width: 981px) {
  .site-header.is-condensed .header-quick {
    display: inline-flex;
  }
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 11px;
  border-radius: 13px;
  border: 1px solid var(--line-strong);
  background: rgba(60, 90, 72, 0.25);
  cursor: pointer;
  transition: border-color 0.15s var(--ease), background-color 0.15s var(--ease);
}

.nav-toggle:hover {
  border-color: var(--line-gold);
  background: rgba(60, 90, 72, 0.45);
}

.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 1.5px;
  border-radius: 2px;
  background: var(--silver);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(6.5px) 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(-6.5px) rotate(-45deg);
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  margin-top: clamp(72px, 9vw, 140px);
  background: linear-gradient(180deg, var(--ink-3), var(--ink) 42%, #0b100f);
  border-top: 1px solid var(--line-gold);
  color: var(--silver);
}

.footer-inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(48px, 6vw, 84px) var(--gutter) 30px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr));
  gap: 44px 32px;
}

.footer-identity {
  display: grid;
  gap: 16px;
  align-content: start;
  max-width: 34ch;
}

.footer-closing {
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.5;
  color: var(--mineral);
  max-width: none;
}

.footer-fact {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  line-height: 1.9;
  color: var(--stone);
  padding-top: 14px;
  border-top: 1px solid var(--line);
  max-width: none;
}

.footer-col {
  display: grid;
  gap: 14px;
  align-content: start;
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0;
}

.footer-col__list {
  display: grid;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-link {
  display: inline-block;
  padding: 5px 0;
  font-size: 15px;
  color: var(--silver);
  transition: color 0.15s var(--ease), transform 0.15s var(--ease);
}

.footer-link:hover {
  color: var(--gold-lt);
  transform: translateX(3px);
}

/* 联络面板 */
.footer-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 28px 48px;
  margin-top: clamp(40px, 5vw, 64px);
  padding: clamp(24px, 3vw, 36px);
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(19, 42, 36, 0.86), rgba(13, 17, 16, 0.7));
}

.footer-contact__head {
  display: grid;
  gap: 14px;
  align-content: start;
  justify-items: start;
}

.footer-contact__note {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--stone);
  max-width: 42ch;
}

.footer-contact__list {
  display: grid;
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
  align-content: start;
}

.footer-contact__item {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.footer-contact__item:first-child {
  padding-top: 0;
  border-top: 0;
}

.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.footer-contact__val {
  font-size: 15px;
  color: var(--bone);
  word-break: break-word;
}

/* 法务行 */
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  margin-top: clamp(32px, 4vw, 48px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--stone);
}

.footer-legal__mark {
  color: var(--gold);
}

/* ---------- 8. 按钮 ---------- */
.button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 0.15s var(--ease), color 0.15s var(--ease),
    background-color 0.15s var(--ease), border-color 0.15s var(--ease);
}

.button--ghost {
  color: var(--gold-lt);
  border-color: var(--line-gold);
  background: rgba(201, 162, 39, 0.07);
}

.button--ghost:hover {
  color: var(--bone);
  border-color: var(--gold);
  background: rgba(201, 162, 39, 0.16);
  transform: translateY(-2px);
}

.button--solid {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
}

.button--solid:hover {
  background: var(--gold-lt);
  border-color: var(--gold-lt);
  transform: translateY(-2px);
}

.button--quiet {
  color: var(--silver);
  border-color: var(--line-strong);
  background: transparent;
}

.button--quiet:hover {
  color: var(--bone);
  border-color: var(--line-gold);
  background: rgba(60, 90, 72, 0.35);
  transform: translateY(-2px);
}

/* ---------- 9. 标签 / 胶囊筛选 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: rgba(60, 90, 72, 0.35);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--silver);
  white-space: nowrap;
}

.tag--gold {
  color: var(--gold-lt);
  border-color: var(--line-gold);
  background: rgba(201, 162, 39, 0.08);
}

.tag--clay {
  color: #E8C3AC;
  border-color: rgba(180, 122, 91, 0.5);
  background: rgba(180, 122, 91, 0.16);
}

.tag--brick {
  color: #E2B0A4;
  border-color: rgba(147, 63, 50, 0.62);
  background: rgba(147, 63, 50, 0.2);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--silver);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s var(--ease), background-color 0.15s var(--ease),
    border-color 0.15s var(--ease);
}

.chip:hover {
  color: var(--bone);
  border-color: var(--line-gold);
  background: rgba(60, 90, 72, 0.32);
}

.chip[aria-pressed="true"] {
  color: var(--gold-lt);
  border-color: var(--gold);
  background: rgba(201, 162, 39, 0.13);
}

/* ---------- 10. 卡片 ---------- */
.card {
  display: grid;
  gap: 14px;
  padding: clamp(22px, 2.4vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(170deg, rgba(19, 42, 36, 0.72), rgba(13, 17, 16, 0.72));
  transition: transform 0.15s var(--ease), border-color 0.15s var(--ease),
    box-shadow 0.15s var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--line-gold);
  box-shadow: var(--lift);
}

.card__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 1.6vw, 24px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.card__body {
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--stone);
}

/* ---------- 11. 面包屑与索引列 ---------- */
.breadcrumbs {
  padding-block: 4px;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--stone);
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs__link {
  color: var(--stone);
  transition: color 0.15s var(--ease);
}

.breadcrumbs__link:hover { color: var(--gold-lt); }

.breadcrumbs__sep {
  color: rgba(110, 118, 108, 0.55);
}

.index-rail {
  position: sticky;
  top: calc(var(--header-h-condensed) + 28px);
  align-self: start;
}

.index-rail__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stone);
}

.index-rail__list {
  display: grid;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.index-rail__link {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: -1px;
  padding: 8px 12px;
  border-left: 2px solid transparent;
  font-size: 14px;
  color: var(--silver);
  transition: color 0.15s var(--ease), background-color 0.15s var(--ease),
    border-color 0.15s var(--ease);
}

.index-rail__link::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--moss);
  transition: background-color 0.15s var(--ease);
}

.index-rail__link:hover {
  color: var(--bone);
  background: rgba(60, 90, 72, 0.26);
}

.index-rail__link[aria-current="true"] {
  color: var(--gold-lt);
  border-left-color: var(--gold);
}

.index-rail__link[aria-current="true"]::before {
  background: var(--gold);
}

/* ---------- 12. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--ink-2), var(--ink-3));
  aspect-ratio: var(--media-ratio, 16 / 10);
}

.media-frame--wide { --media-ratio: 21 / 9; }
.media-frame--tall { --media-ratio: 3 / 4; }
.media-frame--square { --media-ratio: 1 / 1; }

.media-frame__img,
.media-frame > img,
.media-frame > picture {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(13, 17, 16, 0.28), rgba(13, 17, 16, 0.62));
  mix-blend-mode: multiply;
}

.media-frame__caption {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 16px;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--mineral);
}

/* ---------- 13. 显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1200px) {
  .brand-line { display: none; }
}

@media (max-width: 1100px) {
  .version-tag { display: none; }
}

@media (max-width: 1080px) {
  .footer-top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-identity {
    grid-column: 1 / -1;
    max-width: none;
  }
  .footer-contact {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 980px) {
  :root {
    --header-h: 72px;
    --header-h-condensed: 64px;
  }

  .site-header__bar {
    gap: 14px;
  }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    opacity: 0;
    background: var(--ink-2);
    border-bottom: 1px solid var(--line-gold);
    box-shadow: 0 26px 44px -32px rgba(0, 0, 0, 1);
    transition: max-height 0.26s var(--ease), opacity 0.18s var(--ease);
  }

  .site-nav[data-open] {
    max-height: min(74vh, 540px);
    overflow-y: auto;
    visibility: visible;
    opacity: 1;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 16px var(--gutter) 24px;
  }

  .site-nav__item {
    width: 100%;
  }

  .site-nav__item--split {
    margin-left: 0;
    margin-top: 8px;
    padding-left: 0;
    padding-top: 10px;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .site-nav__link {
    width: 100%;
    justify-content: flex-start;
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    font-size: 16px;
  }

  .header-rail {
    min-width: 24px;
  }

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

@media (max-width: 720px) {
  body { font-size: 16.5px; }

  .footer-top {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
  }

  .footer-contact__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .footer-legal {
    justify-content: flex-start;
    gap: 8px 20px;
  }
}

@media (max-width: 460px) {
  .brand-mark__word { display: none; }

  .header-rail::after { opacity: 0.5; }

  .button { padding: 11px 18px; font-size: 14px; }
}

/* ---------- 15. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .card:hover,
  .button:hover,
  .footer-link:hover {
    transform: none;
  }

  .header-rail__mark {
    transition: none;
  }
}