/* ==========================================================================
   竞博数据站 · 共享样式表 /assets/site.css
   基调：深空黑基底 · 电光蓝路径 · 霓虹青节点 · 品红与橙红点色
   ========================================================================== */

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

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

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

ul, ol { list-style: none; }

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

button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }

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

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

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

/* ---------- 2. 设计令牌 ---------- */
:root {
  --ink-900: #05070C;
  --ink-800: #0B111C;
  --ink-700: #131C2B;
  --blue: #1F6BFF;
  --blue-soft: rgba(31, 107, 255, .16);
  --cyan: #35F0D0;
  --magenta: #FF3DCE;
  --orange: #FF5A2B;
  --paper: #E9E4D8;
  --paper-dim: rgba(233, 228, 216, .8);
  --muted: #8C97A8;
  --line: #22304A;
  --line-soft: rgba(34, 48, 74, .62);

  --font-display: "Archivo Black", "Impact", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Sarasa Mono SC", "Noto Sans Mono CJK SC", ui-monospace, SFMono-Regular, Menlo, Consolas, "PingFang SC", "Microsoft YaHei", monospace;

  --wrap: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 76px;
  --cut: 14px;
  --t-fast: .18s ease;
  --t: .28s ease;
}

/* ---------- 3. 页面基底 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(1100px 560px at 88% -12%, rgba(31, 107, 255, .18), transparent 62%),
    radial-gradient(760px 420px at -8% 22%, rgba(53, 240, 208, .07), transparent 60%),
    repeating-linear-gradient(to bottom, rgba(233, 228, 216, .026) 0 1px, transparent 1px 4px);
  background-attachment: fixed, fixed, fixed;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1.75;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--cyan); color: var(--ink-900); }

/* ---------- 4. 排版原子 ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(48px, 9vw, 132px);
  line-height: .95;
  letter-spacing: .02em;
}

.h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 4vw, 52px);
  line-height: 1.05;
  letter-spacing: .01em;
}

.h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.2;
  letter-spacing: .01em;
}

.h4 { font-family: var(--font-mono); font-size: 17px; font-weight: 700; letter-spacing: .06em; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.index-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--orange);
}

.lede { font-size: clamp(15px, 1.6vw, 17px); line-height: 1.8; color: var(--muted); max-width: 62ch; }

.prose { font-size: 15px; line-height: 1.85; color: var(--paper-dim); max-width: 62ch; }
.prose p + p { margin-top: 1em; }
.prose strong { color: var(--paper); font-weight: 700; }

.mono { font-family: var(--font-mono); }
.muted { color: var(--muted); }
.accent { color: var(--cyan); }

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

.container--narrow { max-width: 880px; }
.container--wide { max-width: 1440px; }

.section { padding-block: clamp(48px, 7vw, 96px); }
.section--tight { padding-block: clamp(28px, 4vw, 56px); }

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--line), rgba(34, 48, 74, 0));
  margin-block: clamp(24px, 3vw, 40px);
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(22px, 3vw, 40px);
}

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.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)); }
.grid--sidebar { grid-template-columns: 240px minmax(0, 1fr); }

/* ---------- 6. 形状与容器组件 ---------- */
.cut { clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut))); }
.cut--sm { --cut: 9px; }

.card {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line);
  padding: clamp(18px, 2.2vw, 26px);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: border-color var(--t), background-color var(--t);
}

.card:hover {
  border-color: var(--blue);
  background-image: linear-gradient(180deg, rgba(31, 107, 255, .12), rgba(11, 17, 28, 1));
}

.card__title { font-family: var(--font-display); font-size: 20px; line-height: 1.25; letter-spacing: .02em; margin-bottom: 8px; }
.card__meta { font-size: 12px; letter-spacing: .1em; color: var(--muted); }
.card__index { position: absolute; top: 12px; right: 16px; font-size: 12px; letter-spacing: .14em; color: var(--orange); }

.terminal {
  background: var(--ink-800);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  overflow: hidden;
}

.terminal__bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  background: var(--ink-700);
  border-bottom: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.terminal__dots { display: flex; gap: 5px; }
.terminal__dot { width: 8px; height: 8px; border-radius: 50%; background: var(--line); }
.terminal__dot:first-child { background: var(--orange); }
.terminal__dot:nth-child(2) { background: #4A5A78; }
.terminal__dot:last-child { background: var(--cyan); }
.terminal__title { margin-left: auto; color: var(--cyan); }
.terminal__body { padding: 16px 14px; font-size: 14px; line-height: 1.8; color: var(--paper-dim); }

.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
  background: rgba(19, 28, 43, .6);
  transition: color var(--t-fast), border-color var(--t-fast);
}

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

.rail { position: relative; padding-left: 26px; }
.rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--blue) 55%, transparent);
}

.rail__node {
  position: absolute;
  left: -3px;
  width: 7px;
  height: 7px;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

/* ---------- 7. 图片容器（页面阶段放置占位图） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: border-color var(--t);
}

.media-frame:hover { border-color: var(--blue); }
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.08) saturate(.9) brightness(.92);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(to bottom, rgba(233, 228, 216, .05) 0 1px, transparent 1px 3px);
}

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 12px;
  background: rgba(5, 7, 12, .82);
  border-top: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--paper);
  background: transparent;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: color var(--t-fast), background-color var(--t-fast), border-color var(--t-fast);
}

.btn:hover { border-color: var(--blue); background: var(--blue-soft); }
.btn--primary { background: var(--blue); border-color: var(--blue); color: #F4F7FF; }
.btn--primary:hover { background: #3B80FF; border-color: #3B80FF; }
.btn--ghost { color: var(--cyan); border-color: var(--line); }
.btn--ghost:hover { color: var(--paper); border-color: var(--cyan); background: rgba(53, 240, 208, .1); }
.btn--accent { color: var(--magenta); border-color: rgba(255, 61, 206, .5); }
.btn--accent:hover { background: rgba(255, 61, 206, .12); border-color: var(--magenta); }

/* ---------- 9. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 14px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.breadcrumbs__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs__item + .breadcrumbs__item::before { content: "/"; color: var(--line); }
.breadcrumbs a { color: var(--muted); border-bottom: 1px solid transparent; transition: color var(--t-fast), border-color var(--t-fast); }
.breadcrumbs a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.breadcrumbs [aria-current="page"] { color: var(--paper); }

/* ---------- 10. 数据看板 ---------- */
.stat-board {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.stat { background: var(--ink-800); padding: 20px 22px; }
.stat__num { display: block; font-family: var(--font-display); font-size: clamp(26px, 3.4vw, 40px); line-height: 1; color: var(--cyan); }
.stat__label { margin-top: 8px; font-size: 12px; letter-spacing: .12em; color: var(--muted); }

/* ---------- 11. 显现微交互 ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .5s ease, transform .5s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 12. 头部：紧凑命令栏 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -70px;
  z-index: 90;
  padding: 10px 16px;
  background: var(--cyan);
  color: var(--ink-900);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  transition: top var(--t-fast);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(5, 7, 12, .88);
  border-bottom: 1px solid var(--line);
  transition: background-color var(--t), border-color var(--t);
}

.site-header.is-condensed {
  background: rgba(5, 7, 12, .97);
  border-bottom-color: rgba(31, 107, 255, .5);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  width: 100%;
  max-width: var(--wrap);
  min-height: var(--header-h);
  margin-inline: auto;
  padding-inline: var(--gutter);
  transition: min-height var(--t), padding var(--t);
}

.site-header.is-condensed .site-header__inner { min-height: 56px; }

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--blue) 55%, var(--magenta));
  transform: scaleX(0);
  transform-origin: 0 50%;
}

.brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; padding-block: 4px; }

.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--cyan);
  color: var(--ink-900);
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: .04em;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
  transition: background-color var(--t-fast);
}

.brand:hover .brand__mark { background: var(--paper); }

.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name { font-family: var(--font-display); font-size: 16px; letter-spacing: .04em; color: var(--paper); }
.brand__sub { font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); }

.nav { margin-left: auto; min-width: 0; }
.nav__list { display: flex; align-items: center; gap: 2px; }

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 11px;
  font-size: 13px;
  letter-spacing: .03em;
  color: var(--muted);
  border: 1px solid transparent;
  transition: color var(--t-fast), background-color var(--t-fast), border-color var(--t-fast);
}

.nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--orange);
  transform: translateY(-50%);
  transition: height var(--t-fast);
}

.nav__index { font-size: 10px; letter-spacing: .1em; color: rgba(140, 151, 168, .78); transition: color var(--t-fast); }

.nav__link:hover { color: var(--paper); background: var(--ink-700); border-color: var(--line); }
.nav__link:hover::before { height: 58%; }
.nav__link:hover .nav__index { color: var(--orange); }

.nav__link[aria-current="page"] {
  color: var(--paper);
  background-image: linear-gradient(180deg, rgba(31, 107, 255, .24), rgba(31, 107, 255, .05));
  border-color: rgba(31, 107, 255, .55);
}

.nav__link[aria-current="page"]::before { height: 58%; background: var(--cyan); }
.nav__link[aria-current="page"] .nav__index { color: var(--cyan); }

.command-bar { display: flex; align-items: center; gap: 8px; flex: 0 0 auto; }

.command-bar__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
  background: rgba(19, 28, 43, .65);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  transition: color var(--t-fast), border-color var(--t-fast), background-color var(--t-fast);
}

.command-bar__link:hover,
.command-bar__link:focus-visible { color: var(--paper); border-color: var(--blue); background: var(--blue-soft); }
.command-bar__link:last-child:hover { border-color: var(--magenta); background: rgba(255, 61, 206, .12); }
.command-bar__key { font-size: 10px; letter-spacing: .1em; color: var(--cyan); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: 12px;
  letter-spacing: .12em;
  transition: border-color var(--t-fast), background-color var(--t-fast);
}

.nav-toggle:hover { border-color: var(--cyan); background: rgba(53, 240, 208, .08); }
.nav-toggle__bars { display: grid; gap: 3px; width: 16px; }
.nav-toggle__bars span { display: block; height: 2px; background: var(--cyan); transition: transform var(--t-fast), opacity var(--t-fast); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child { transform: translateY(-5px) rotate(-45deg); }
.nav-toggle__label { font-weight: 700; }

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 112px);
  background: var(--ink-800);
  color: var(--muted);
  font-size: 14px;
}

.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -46px;
  height: 46px;
  background: linear-gradient(180deg, rgba(31, 107, 255, .35), var(--ink-800) 42%);
  clip-path: polygon(0 100%, 0 60%, 100% 0, 100% 100%);
  pointer-events: none;
}

.site-footer .container { padding-block: clamp(40px, 5vw, 72px) 28px; }

.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.footer__brand { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.footer__name { font-family: var(--font-display); font-size: 20px; letter-spacing: .04em; color: var(--paper); }
.footer__motto { font-size: 13px; letter-spacing: .06em; color: var(--cyan); }
.footer__domain { font-size: 12px; letter-spacing: .14em; color: var(--muted); }

.footer__nav { min-width: 0; }
.footer__grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 20px; }

.footer__col-title {
  padding-bottom: 8px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--cyan);
}

.footer__list { display: grid; gap: 8px; }

.footer__link {
  position: relative;
  display: inline-block;
  padding-left: 0;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
  transition: color var(--t-fast), padding-left var(--t-fast);
}

.footer__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 2px;
  background: var(--orange);
  transform: translateY(-50%);
  transition: width var(--t-fast);
}

.footer__link:hover { color: var(--paper); padding-left: 12px; }
.footer__link:hover::before { width: 8px; }

.footer__contact { min-width: 0; }

.contact-list { display: grid; gap: 0; margin-bottom: 14px; }

.contact-list__item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: start;
  padding-block: 10px;
  border-bottom: 1px solid var(--line-soft);
}

.contact-list__label { font-size: 11px; letter-spacing: .12em; color: var(--cyan); }
.contact-list__value { font-size: 13px; line-height: 1.7; color: var(--paper); word-break: break-word; }

.copy-btn {
  padding: 3px 9px;
  border: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
  transition: color var(--t-fast), border-color var(--t-fast), background-color var(--t-fast);
}

.copy-btn:hover { color: var(--cyan); border-color: var(--cyan); background: rgba(53, 240, 208, .08); }
.copy-btn.is-copied { color: var(--ink-900); background: var(--cyan); border-color: var(--cyan); }

.footer__note { margin-bottom: 16px; font-size: 12px; line-height: 1.8; color: var(--muted); max-width: 42ch; }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: clamp(24px, 3vw, 36px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 12px;
}

.footer__legal { display: flex; flex-wrap: wrap; gap: 18px; }
.footer__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.footer__icp { padding: 3px 10px; border: 1px solid var(--line); letter-spacing: .1em; color: var(--muted); }
.footer__copy { letter-spacing: .08em; color: var(--muted); }

/* ---------- 14. 响应式：平板 ---------- */
@media (max-width: 1120px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--sidebar { grid-template-columns: 1fr; }
}

@media (min-width: 760px) {
  .footer__top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1140px) {
  .footer__top { grid-template-columns: minmax(200px, .8fr) minmax(0, 1.7fr) minmax(300px, 1.1fr); }
}

/* ---------- 15. 响应式：移动导航 ---------- */
@media (max-width: 1040px) {
  .nav-toggle { display: inline-flex; order: 2; margin-left: auto; }

  .site-header__inner {
    flex-wrap: wrap;
    row-gap: 10px;
    min-height: 0;
    padding-block: 10px;
  }

  .site-header.is-condensed .site-header__inner { min-height: 0; padding-block: 6px; }

  .brand { order: 1; }

  .command-bar {
    order: 3;
    flex: 1 1 100%;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: none;
  }

  .command-bar::-webkit-scrollbar { display: none; }
  .command-bar__link { white-space: nowrap; }

  .nav {
    order: 4;
    flex: 1 1 100%;
    display: block;
    margin-left: 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--t), opacity var(--t-fast);
  }

  .nav[data-open] {
    max-height: 66vh;
    overflow-y: auto;
    opacity: 1;
    border-top: 1px solid var(--line);
    margin-top: 4px;
  }

  .nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav__item { width: 100%; }

  .nav__link {
    width: 100%;
    padding: 13px 4px;
    font-size: 14px;
    border: 0;
    border-bottom: 1px solid var(--line-soft);
    background: none;
  }

  .nav__link:hover,
  .nav__link[aria-current="page"] {
    background-image: linear-gradient(90deg, rgba(31, 107, 255, .2), transparent 70%);
    border-bottom-color: var(--line-soft);
    padding-left: 12px;
  }

  .nav__link::before { height: 0; }
  .nav__link:hover::before,
  .nav__link[aria-current="page"]::before { height: 62%; }
}

/* ---------- 16. 响应式：手机 ---------- */
@media (max-width: 720px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contact-list__item { grid-template-columns: 1fr auto; }
  .contact-list__label { grid-column: 1 / -1; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
  .stat-board { grid-template-columns: 1fr; }
}

@media (max-width: 420px) {
  .nav-toggle__label { display: none; }
  .brand__sub { display: none; }
}

/* ---------- 17. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .reveal { opacity: 1; transform: none; }
}