/* =========================================================
   南宫28体育 · 共享样式 /assets/site.css
   reset · tokens · 中文排版 · 页头 · 页脚 · 通用组件
   ========================================================= */

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100%;
  color: #E8EEF6;
  color: var(--c-text);
  background-color: #0A1626;
  background-color: var(--c-ink);
  background-image:
    radial-gradient(900px 480px at 82% -10%, rgba(79, 227, 208, 0.10), transparent 70%),
    radial-gradient(720px 420px at 6% 2%, rgba(255, 155, 74, 0.07), transparent 72%),
    linear-gradient(rgba(30, 58, 92, 0.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 58, 92, 0.22) 1px, transparent 1px);
  background-size: auto, auto, 140px 140px, 140px 140px;
  background-repeat: no-repeat, no-repeat, repeat, repeat;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  font-weight: 400;
  text-rendering: optimizeLegibility;
}

:root {
  --c-ink: #0A1626;
  --c-layer: #12243B;
  --c-line: #1E3A5C;
  --c-cyan: #4FE3D0;
  --c-cyan-soft: #A8F0E6;
  --c-orange: #FF9B4A;
  --c-orange-deep: #D9712A;
  --c-mist: #8E8FA8;
  --c-text: #E8EEF6;
  --c-text-2: #9BB0C7;
  --c-paper: #EDE6D8;

  --font-head: "Arial Narrow", "Helvetica Neue Condensed", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --wrap: 1180px;
  --gutter: clamp(18px, 4vw, 40px);
  --r: 2px;
  --hair: 1px solid var(--c-line);
  --shadow-soft: 0 2px 10px rgba(3, 9, 18, 0.35);
  --shadow-deep: 0 10px 30px rgba(3, 9, 18, 0.5);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --t: 220ms;
}

img, svg, video { max-width: 100%; height: auto; display: block; }
figure { margin: 0; }

h1, h2, h3, h4, h5 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
  margin: 0 0 0.5em;
  color: var(--c-text);
}
h3, h4 { font-weight: 600; }

p { margin: 0 0 1em; }
a { color: var(--c-cyan); text-decoration: none; }
a:hover { color: var(--c-cyan-soft); }
ul, ol { margin: 0 0 1em; padding-left: 1.3em; }
li { margin-bottom: 0.35em; }
hr { border: 0; border-top: var(--hair); margin: 0; }

::selection { background: var(--c-cyan); color: var(--c-ink); }

:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
  border-radius: var(--r);
}

.mono {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

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

.section {
  padding-block: clamp(40px, 7vw, 88px);
  border-top: var(--hair);
}
.section--plain { border-top: 0; }
.section--layer { background: rgba(18, 36, 59, 0.42); }

.section__head {
  display: grid;
  gap: 6px 26px;
  grid-template-columns: minmax(0, 1fr);
  align-items: baseline;
  margin-bottom: clamp(22px, 4vw, 44px);
}
.section__index {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-orange);
  text-transform: uppercase;
}
.section__title {
  margin: 0;
  font-size: clamp(24px, 3.4vw, 40px);
}
.section__lead {
  margin: 0;
  max-width: 62ch;
  color: var(--c-text-2);
  font-size: clamp(15px, 1.4vw, 17px);
}
@media (min-width: 840px) {
  .section__head { grid-template-columns: 160px minmax(0, 1fr); }
  .section__index { grid-row: 1 / span 2; padding-top: 0.5em; }
}

.page-head { padding-block: clamp(26px, 5vw, 56px); }
.page-head__index {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-orange);
}
.page-head__title { font-size: clamp(28px, 4.8vw, 52px); margin: 0 0 12px; }
.page-head__lead { margin: 0; max-width: 62ch; color: var(--c-text-2); }

.prose { max-width: 68ch; }
.prose h2 { font-size: clamp(22px, 2.6vw, 30px); margin-top: 1.8em; }
.prose h3 { font-size: clamp(18px, 2vw, 22px); margin-top: 1.6em; }
.prose p, .prose li { color: var(--c-text); }
.prose a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-decoration-color: rgba(79, 227, 208, 0.4);
  text-underline-offset: 3px;
}
.prose a:hover { text-decoration-color: var(--c-cyan); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border: var(--hair);
  border-radius: var(--r);
  background: transparent;
  color: var(--c-text);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  line-height: 1.4;
  cursor: pointer;
  text-decoration: none;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease),
              background-color var(--t) var(--ease), transform var(--t) var(--ease);
}
.btn:hover {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
  background: rgba(79, 227, 208, 0.06);
  transform: translateY(-2px);
}
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: var(--c-ink);
}
.btn--primary:hover {
  background: var(--c-cyan-soft);
  border-color: var(--c-cyan-soft);
  color: var(--c-ink);
}
.btn--ghost { border-color: rgba(30, 58, 92, 0.9); color: var(--c-text-2); }
.btn--ghost:hover { color: var(--c-cyan); }
.btn--sm { padding: 7px 13px; font-size: 12px; }

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  border-bottom: var(--hair);
  background: rgba(18, 36, 59, 0.4);
}
.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 12px 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}
.breadcrumbs__item { display: inline-flex; align-items: center; gap: 8px; margin: 0; }
.breadcrumbs__item:not(:last-child)::after { content: "／"; color: var(--c-line); }
.breadcrumbs__link { color: var(--c-text-2); }
.breadcrumbs__link:hover { color: var(--c-cyan); }
.breadcrumbs__current { color: var(--c-cyan); }

/* ---------- 网格 ---------- */
.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid--asym { grid-template-columns: minmax(0, 1fr); }
@media (min-width: 900px) {
  .grid--asym { grid-template-columns: 1.45fr 1fr; align-items: start; }
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: var(--hair);
  border-radius: var(--r);
  background: var(--c-layer);
  transition: transform var(--t) var(--ease), border-color var(--t) var(--ease),
              box-shadow var(--t) var(--ease);
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--c-cyan);
  box-shadow: var(--shadow-soft);
}
.card__meta {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-orange);
}
.card__title { margin: 0 0 10px; font-size: clamp(18px, 2vw, 24px); }
.card__text { margin: 0; color: var(--c-text-2); font-size: 15px; }

/* ---------- 目录索引 ---------- */
.index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--hair);
}
.index-list__item { border-bottom: var(--hair); margin: 0; }
.index-list__link {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 16px 10px;
  color: var(--c-text);
  text-decoration: none;
  transition: background-color var(--t) var(--ease), color var(--t) var(--ease),
              padding-left var(--t) var(--ease);
}
.index-list__num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--c-mist);
  transition: color var(--t) var(--ease);
}
.index-list__label { font-size: 16px; font-weight: 500; }
.index-list__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-mist);
  opacity: 0;
  transition: opacity var(--t) var(--ease);
}
.index-list__link:hover,
.index-list__link:focus-visible {
  background: rgba(79, 227, 208, 0.06);
  color: var(--c-cyan-soft);
  padding-left: 16px;
}
.index-list__link:hover .index-list__num,
.index-list__link:focus-visible .index-list__num { color: var(--c-cyan); }
.index-list__link:hover .index-list__note,
.index-list__link:focus-visible .index-list__note { opacity: 1; }
.index-list__link.is-active {
  color: var(--c-cyan);
  box-shadow: inset 2px 0 0 var(--c-orange);
}
.index-list__link.is-active .index-list__num { color: var(--c-orange); }
@media (hover: none) {
  .index-list__note { opacity: 1; }
}
@media (max-width: 620px) {
  .index-list__link { grid-template-columns: 44px minmax(0, 1fr); }
  .index-list__note { grid-column: 2; opacity: 1; }
}

/* ---------- 标签 / 时间戳 / 旁注 ---------- */
.tag {
  display: inline-block;
  padding: 3px 9px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--c-text-2);
}
.tag--cyan { border-color: rgba(79, 227, 208, 0.5); color: var(--c-cyan); }
.tag--orange { border-color: rgba(255, 155, 74, 0.5); color: var(--c-orange); }

.timestamp {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-orange);
  font-variant-numeric: tabular-nums;
}

.note {
  margin: 0 0 1.2em;
  padding: 6px 0 6px 16px;
  border-left: 2px solid var(--c-cyan);
  color: var(--c-text-2);
  font-size: 15px;
}

/* ---------- 折叠面板 ---------- */
.fold {
  border: var(--hair);
  border-radius: var(--r);
  background: var(--c-layer);
}
.fold + .fold { margin-top: -1px; }
.fold__summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  font-weight: 500;
  color: var(--c-text);
  transition: color var(--t) var(--ease);
}
.fold__summary::-webkit-details-marker { display: none; }
.fold__summary::after {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--c-cyan);
  flex: 0 0 auto;
}
.fold[open] > .fold__summary::after { content: "－"; }
.fold__summary:hover { color: var(--c-cyan-soft); }
.fold__body {
  margin: 0 20px 20px 18px;
  padding-left: 16px;
  border-left: 2px solid rgba(79, 227, 208, 0.65);
  color: var(--c-text-2);
  font-size: 15px;
}
.fold[open] > .fold__body { animation: foldIn var(--t) var(--ease); }
@keyframes foldIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 数据 ---------- */
.stat { display: grid; gap: 4px; }
.stat__value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(34px, 6vw, 84px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}
.stat__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-mist);
}

.data-bar {
  height: 6px;
  border-radius: 999px;
  background: rgba(30, 58, 92, 0.6);
  overflow: hidden;
}
.data-bar__fill {
  display: block;
  height: 100%;
  width: var(--value, 60%);
  background: linear-gradient(90deg, var(--c-cyan), var(--c-orange));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 900ms var(--ease);
}
.is-visible .data-bar__fill,
.data-bar.is-visible .data-bar__fill { transform: scaleX(1); }

/* ---------- 图像容器 ---------- */
.figure { margin: 0; }
.figure__frame {
  position: relative;
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: var(--hair);
  border-radius: var(--r);
  background-color: var(--c-ink);
  background-image:
    radial-gradient(120% 90% at 20% 0%, rgba(30, 58, 92, 0.75), rgba(10, 22, 38, 0.95) 70%),
    linear-gradient(rgba(79, 227, 208, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 227, 208, 0.05) 1px, transparent 1px);
  background-size: auto, 26px 26px, 26px 26px;
  transition: border-color var(--t) var(--ease);
}
.figure__frame--wide { aspect-ratio: 21 / 9; }
.figure__frame--tall { aspect-ratio: 3 / 4; }
.figure__frame:hover { border-color: var(--c-cyan); }
.figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}
.figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--c-mist);
}

/* ---------- 滚动显现 / 进度 / 返回顶部 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 480ms var(--ease), transform 480ms var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 90;
  pointer-events: none;
  background: transparent;
}
.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-orange));
}

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 13px;
  border: var(--hair);
  border-radius: var(--r);
  background: rgba(18, 36, 59, 0.94);
  color: var(--c-text-2);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t) var(--ease), visibility var(--t) var(--ease),
              color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.to-top.is-visible { opacity: 1; visibility: visible; }
.to-top:hover { color: var(--c-cyan); border-color: var(--c-cyan); }

[data-index-section] { scroll-margin-top: 104px; }

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  left: 50%;
  top: 0;
  z-index: 120;
  padding: 11px 20px;
  background: var(--c-cyan);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-radius: 0 0 var(--r) var(--r);
  transform: translate(-50%, -160%);
  transition: transform var(--t) var(--ease);
}
.skip-link:focus {
  transform: translate(-50%, 0);
  color: var(--c-ink);
}

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: var(--hair);
  background: linear-gradient(180deg, rgba(10, 22, 38, 0.99), rgba(10, 22, 38, 0.93));
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.header-bar { border-bottom: 1px dashed rgba(30, 58, 92, 0.9); }
.header-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 46px;
  padding-block: 7px;
}
.header-bar__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-mist);
  white-space: nowrap;
}
.header-bar__actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.header-bar__contact {
  font-size: 12.5px;
  color: var(--c-text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.header-bar__contact:hover {
  color: var(--c-cyan);
  border-bottom-color: rgba(79, 227, 208, 0.6);
}

.masthead {
  display: grid;
  justify-items: center;
  text-align: center;
  gap: 8px;
  padding-block: clamp(18px, 3vw, 34px);
  max-height: 340px;
  overflow: hidden;
  transition: max-height var(--t) var(--ease), padding var(--t) var(--ease),
              opacity var(--t) var(--ease);
}
.masthead__kicker {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.3em;
  color: var(--c-orange);
}
.masthead__brand {
  font-family: var(--font-head);
  font-weight: 800;
  font-stretch: condensed;
  font-size: clamp(34px, 7.4vw, 64px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-text);
  text-decoration: none;
  transition: color var(--t) var(--ease);
}
.masthead__brand:hover { color: var(--c-cyan-soft); }
.masthead__tagline {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.18em;
  color: var(--c-text-2);
}
.site-header.is-condensed .masthead {
  max-height: 0;
  padding-block: 0;
  opacity: 0;
}

.site-nav {
  border-top: var(--hair);
  background: rgba(18, 36, 59, 0.5);
}
.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: clamp(4px, 1.8vw, 28px);
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-nav__item { margin: 0; }
.site-nav__link {
  position: relative;
  display: block;
  padding: 14px 6px;
  font-size: 14.5px;
  letter-spacing: 0.04em;
  color: var(--c-text-2);
  text-decoration: none;
  transition: color var(--t) var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 6px;
  right: 6px;
  bottom: 7px;
  height: 1px;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--t) var(--ease), background-color var(--t) var(--ease);
}
.site-nav__link:hover { color: var(--c-text); }
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--c-cyan); }
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--c-orange);
}
.site-nav__link:focus-visible { color: var(--c-cyan); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 7px 11px;
  border: var(--hair);
  border-radius: var(--r);
  background: transparent;
  color: var(--c-text);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}
.nav-toggle:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.nav-toggle__bars {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background-color var(--t) var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--t) var(--ease), top var(--t) var(--ease);
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }
.nav-toggle__label { white-space: nowrap; }

@keyframes navIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 8vw, 96px);
  border-top: var(--hair);
  background: linear-gradient(180deg, rgba(18, 36, 59, 0.55), rgba(10, 22, 38, 1) 78%);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(22px, 3.6vw, 48px);
  padding-block: clamp(34px, 6vw, 64px);
}
.footer-brand { grid-column: 1 / -1; }
.footer-brand__name {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-stretch: condensed;
  font-size: 24px;
  letter-spacing: -0.01em;
  color: var(--c-text);
}
.footer-brand__note {
  margin: 0 0 14px;
  max-width: 34ch;
  color: var(--c-text-2);
  font-size: 14px;
}
.footer-brand__meta {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--c-mist);
}
.footer-col__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-orange);
}
.footer-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-list li { margin: 0; }
.footer-list__link {
  color: var(--c-text-2);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--t) var(--ease), padding-left var(--t) var(--ease);
}
.footer-list__link:hover {
  color: var(--c-cyan);
  padding-left: 5px;
}
.footer-col--contact .footer-contact__item {
  color: var(--c-text-2);
  font-size: 14px;
  line-height: 1.7;
}
.footer-col--contact .footer-contact__item.mono {
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--c-text);
}
.footer-legal {
  border-top: var(--hair);
  background: rgba(10, 22, 38, 0.6);
}
.footer-legal__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 24px;
  padding-block: 16px;
  font-size: 12.5px;
  color: var(--c-mist);
}
.footer-legal__icp,
.footer-legal__copy,
.footer-legal__env { margin: 0; }
.footer-legal__env { color: var(--c-mist); }

@media (min-width: 900px) {
  .footer-grid { grid-template-columns: 1.7fr 1fr 1fr 1.3fr; }
  .footer-brand { grid-column: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .header-bar__meta { display: none; }
  .header-bar__inner { gap: 10px; }
  .site-nav { display: none; background: var(--c-ink); }
  .site-header[data-open] .site-nav {
    display: block;
    animation: navIn var(--t) var(--ease);
  }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: 6px;
  }
  .site-nav__item { border-bottom: 1px dashed rgba(30, 58, 92, 0.85); }
  .site-nav__item:last-child { border-bottom: 0; }
  .site-nav__link { padding: 14px 4px; font-size: 16px; }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] { box-shadow: inset 2px 0 0 var(--c-orange); padding-left: 12px; }
  .masthead { max-height: 260px; }
}

@media (max-width: 560px) {
  .header-bar__contact { display: none; }
  .masthead__tagline { letter-spacing: 0.12em; }
  .section { padding-block: 40px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (min-width: 861px) {
  .site-nav { display: block; }
}

/* ---------- 动效降级 ---------- */
@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;
  }
  .reveal { opacity: 1; transform: none; }
  .data-bar__fill { transform: scaleX(1); }
  .card:hover, .btn:hover { transform: none; }
}