/* ============================================================
   大江体育赛场 · 共享站点样式 /assets/site.css
   夜航江面信号系统：深海底色 + 江潮青数据层 + 信号橙红强调
   ============================================================ */

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

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

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(1100px 560px at 88% -8%, rgba(30, 127, 140, 0.30), transparent 68%),
    radial-gradient(820px 460px at 2% 108%, rgba(255, 90, 54, 0.12), transparent 70%),
    repeating-linear-gradient(180deg, rgba(127, 211, 216, 0.045) 0 1px, transparent 1px 68px);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: var(--teal-bright); text-decoration: none; }
a:hover { color: var(--sand); }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; }
strong { font-weight: 700; color: var(--paper); }

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

::selection { background: var(--signal); color: #06131c; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink-900: #061826;
  --ink-950: #04121d;
  --ink-800: #08222f;
  --deep: #0C2C42;
  --deep-line: #16394f;
  --teal: #1E7F8C;
  --teal-bright: #7FD3D8;
  --signal: #FF5A36;
  --signal-deep: #B23A1E;
  --sand: #E8B96A;
  --sand-pale: #F1E4CC;
  --paper: #F4F7F8;
  --mist: #A9BCC6;

  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --w-max: 1340px;
  --pad: 24px;
  --line: 2px solid var(--deep-line);
  --hard-shadow: 6px 6px 0 rgba(3, 12, 20, 0.55);
  --radius: 2px;
  --header-h: 100px;
}

@media (max-width: 640px) {
  :root { --pad: 18px; }
  body { font-size: 16px; }
}

/* ---------- 3. 排版工具 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sand);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--signal);
}

.section__title {
  font-size: clamp(26px, 3.2vw, 42px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.num--score {
  display: block;
  font-size: clamp(48px, 8vw, 112px);
  font-weight: 700;
  line-height: 0.95;
  color: var(--signal);
}

/* ---------- 4. 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--w-max);
  margin: 0 auto;
  padding: 0 var(--pad);
}

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

.section {
  position: relative;
  padding: 96px 0;
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 36px;
}

.grid {
  display: grid;
  gap: 28px;
}

.grid--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.grid--split-rev { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }

[data-section],
#main-content {
  scroll-margin-top: 124px;
}

/* ---------- 5. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 2px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: background-color 0.18s ease-out, color 0.18s ease-out,
              border-color 0.18s ease-out, transform 0.18s ease-out, box-shadow 0.18s ease-out;
}

.btn--signal {
  background: var(--signal);
  color: #0a1015;
  border-color: #0a1015;
  box-shadow: 4px 4px 0 rgba(232, 185, 106, 0.55);
}

.btn--signal:hover {
  background: #ff7350;
  color: #0a1015;
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 rgba(232, 185, 106, 0.55);
}

.btn--signal:active {
  background: var(--signal-deep);
  color: var(--paper);
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 rgba(232, 185, 106, 0.5);
}

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--teal);
}

.btn--ghost:hover {
  color: var(--teal-bright);
  border-color: var(--teal-bright);
  background: rgba(30, 127, 140, 0.14);
}

.btn--sand {
  background: var(--sand);
  color: #0a1015;
  border-color: #0a1015;
  box-shadow: 4px 4px 0 rgba(6, 24, 38, 0.6);
}

.btn--sand:hover {
  background: #f2ca8c;
  color: #0a1015;
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 rgba(6, 24, 38, 0.6);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--teal);
  border-radius: var(--radius);
  background: rgba(30, 127, 140, 0.14);
  color: var(--teal-bright);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1.5;
}

.tag--signal {
  border-color: var(--signal);
  background: rgba(255, 90, 54, 0.12);
  color: var(--signal);
}

.tag--sand {
  border-color: var(--sand);
  background: rgba(232, 185, 106, 0.12);
  color: var(--sand);
}

.card {
  position: relative;
  padding: 24px;
  background: var(--deep);
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--hard-shadow);
  color: var(--paper);
}

.card--signal { border-color: var(--signal); }

.card--sand {
  background: var(--sand-pale);
  border-color: #b9974f;
  color: #0b1a24;
}

.card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.card__title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: inherit;
}

.card__body {
  color: var(--mist);
  font-size: 15px;
  line-height: 1.7;
}

.card--sand .card__body { color: #33474f; }

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border: 2px solid var(--deep-line);
  border-radius: var(--radius);
  background: rgba(12, 44, 66, 0.6);
}

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--sand);
}

.stat__label {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.media {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  border: var(--line);
  border-radius: var(--radius);
  background-color: var(--ink-950);
  background-image:
    linear-gradient(150deg, rgba(30, 127, 140, 0.42), rgba(6, 24, 38, 0.9) 70%),
    repeating-linear-gradient(115deg, rgba(127, 211, 216, 0.16) 0 2px, transparent 2px 12px);
  box-shadow: var(--hard-shadow);
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

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

.media__caption {
  padding: 10px 14px;
  border-top: 1px solid rgba(127, 211, 216, 0.18);
  background: rgba(4, 18, 29, 0.92);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  line-height: 1.6;
}

.data-table {
  width: 100%;
  border: 2px solid var(--deep-line);
  background: rgba(12, 44, 66, 0.55);
  font-size: 14px;
}

.data-table caption {
  padding-bottom: 10px;
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-align: left;
  text-transform: uppercase;
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(127, 211, 216, 0.16);
  text-align: left;
  vertical-align: top;
}

.data-table thead th {
  background: var(--ink-950);
  color: var(--sand);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.data-table tbody th { color: var(--paper); font-weight: 600; }
.data-table td { color: var(--paper); }
.data-table tbody tr:last-child th,
.data-table tbody tr:last-child td { border-bottom: 0; }

.callout {
  padding: 18px 20px;
  border-left: 4px solid var(--signal);
  background: rgba(255, 90, 54, 0.09);
  color: var(--paper);
  font-size: 15px;
  line-height: 1.75;
}

.callout__label {
  display: block;
  margin-bottom: 6px;
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.divider-tide {
  height: 2px;
  margin: 0;
  border: 0;
  background: linear-gradient(90deg, transparent, var(--teal) 25%, var(--signal) 60%, var(--sand) 85%, transparent);
  opacity: 0.75;
}

.breadcrumbs {
  padding: 18px 0;
  border-bottom: 1px solid rgba(127, 211, 216, 0.16);
  color: var(--mist);
  font-size: 13px;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumbs__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--teal);
}

.breadcrumbs__link { color: var(--mist); }
.breadcrumbs__link:hover { color: var(--sand); }
.breadcrumbs [aria-current="page"] { color: var(--sand); }

/* ---------- 6. 版本轨道（页面阶段渲染） ---------- */
.rail {
  position: sticky;
  top: 124px;
  padding: 20px 18px 24px;
  border: var(--line);
  border-radius: var(--radius);
  background: rgba(12, 44, 66, 0.78);
  box-shadow: var(--hard-shadow);
}

.rail__title {
  margin-bottom: 16px;
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.rail__list {
  border-left: 2px solid rgba(127, 211, 216, 0.28);
}

.rail__item { position: relative; }

.rail__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0 10px 18px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.18s ease-out, background-color 0.18s ease-out;
}

.rail__link::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 16px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--teal-bright);
  border-radius: 50%;
  background: var(--deep);
  transition: background-color 0.2s ease-out, border-color 0.2s ease-out, box-shadow 0.2s ease-out;
}

.rail__link:hover { color: var(--paper); }

.rail__link.is-active,
.rail__link[aria-current="true"] {
  color: var(--sand);
  font-weight: 700;
}

.rail__link.is-active::before,
.rail__link[aria-current="true"]::before {
  background: var(--signal);
  border-color: var(--signal);
  box-shadow: 0 0 0 4px rgba(255, 90, 54, 0.22);
}

.rail__num {
  color: var(--teal-bright);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

/* ---------- 7. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--ink-900);
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 300;
  padding: 10px 16px;
  border-radius: var(--radius);
  background: var(--sand);
  color: #06131c;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.18s ease-out;
}

.skip-link:focus { top: 10px; color: #06131c; }

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  height: 3px;
  background: rgba(12, 44, 66, 0.75);
  pointer-events: none;
}

.progress-bar__fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--teal-bright) 0%, var(--sand) 55%, var(--signal) 100%);
  transition: width 0.12s linear;
}

/* 上层品牌带 */
.util-band {
  position: relative;
  z-index: 3;
  background: var(--ink-950);
  border-bottom: 1px solid rgba(127, 211, 216, 0.22);
}

.util-band__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  width: 100%;
  max-width: var(--w-max);
  min-height: 44px;
  margin: 0 auto;
  padding: 0 var(--pad);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand__mark {
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  background: var(--signal);
  border: 2px solid var(--ink-950);
  border-radius: 1px;
  box-shadow: 4px 4px 0 rgba(232, 185, 106, 0.45);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.brand__name {
  color: var(--paper);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.brand__tag {
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  line-height: 1.4;
  text-transform: uppercase;
  white-space: nowrap;
}

.util-band__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  min-width: 0;
}

.util-band__label {
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.util-band__mail {
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.util-band__cta {
  flex: 0 0 auto;
  padding: 8px 16px;
  font-size: 13px;
}

/* 下层栏目带 */
.nav-band {
  position: relative;
  z-index: 2;
  background: var(--ink-800);
  border-bottom: 2px solid var(--deep-line);
}

.nav-band__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: var(--w-max);
  min-height: 56px;
  margin: 0 auto;
  padding: 0 var(--pad);
}

.main-nav { display: flex; align-items: center; min-width: 0; }

.main-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav__item { position: relative; }

.main-nav__link {
  display: block;
  padding: 9px 13px;
  border-bottom: 2px solid transparent;
  border-radius: 1px;
  color: var(--mist);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.16s ease-out, background-color 0.16s ease-out, border-color 0.16s ease-out;
}

.main-nav__link:hover {
  color: var(--paper);
  background: rgba(30, 127, 140, 0.16);
}

.main-nav__link[aria-current="page"] {
  color: var(--sand);
  border-bottom-color: var(--sand);
  background: rgba(232, 185, 106, 0.1);
}

.signal-lamp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 6px 12px;
  border: 2px solid var(--signal);
  border-radius: var(--radius);
  background: rgba(255, 90, 54, 0.12);
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  line-height: 1.4;
  text-decoration: none;
  transition: background-color 0.18s ease-out, color 0.18s ease-out;
}

.signal-lamp:hover {
  background: var(--signal);
  color: #0a1015;
}

.signal-lamp__dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--signal);
  animation: lampPulse 2.4s ease-out infinite;
}

.signal-lamp__text { white-space: nowrap; }

@keyframes lampPulse {
  0%   { box-shadow: 0 0 0 0 rgba(255, 90, 54, 0.55); }
  70%  { box-shadow: 0 0 0 10px rgba(255, 90, 54, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 90, 54, 0); }
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 2px solid var(--teal);
  border-radius: var(--radius);
  background: rgba(30, 127, 140, 0.14);
  color: var(--paper);
  transition: border-color 0.18s ease-out, background-color 0.18s ease-out;
}

.nav-toggle:hover { border-color: var(--teal-bright); }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--sand);
  transition: transform 0.2s ease-out, opacity 0.2s ease-out;
}

.nav-toggle__label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.site-header[data-open] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }

.site-header[data-open] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

body.is-nav-open { overflow: hidden; }

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 120px;
  background: var(--ink-950);
  border-top: 2px solid var(--deep-line);
  color: var(--paper);
}

.footer__tide {
  height: 4px;
  background: linear-gradient(90deg, var(--signal), var(--sand) 38%, var(--teal) 78%, var(--ink-950));
  opacity: 0.85;
}

.footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 2fr) minmax(0, 1.25fr);
  gap: 44px;
  width: 100%;
  max-width: var(--w-max);
  margin: 0 auto;
  padding: 64px var(--pad) 40px;
}

.brand--footer .brand__name { font-size: 17px; }

.footer__summary {
  max-width: 34ch;
  margin-top: 18px;
  color: var(--paper);
  font-size: 16px;
  line-height: 1.7;
}

.footer__note {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 2px solid var(--teal);
  color: var(--mist);
  font-size: 13px;
  line-height: 1.65;
}

.footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.footer__col { min-width: 0; }

.footer__title {
  margin-bottom: 14px;
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  line-height: 1.4;
}

.footer__list li + li { margin-top: 10px; }

.footer__list a {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.16s ease-out, border-color 0.16s ease-out;
}

.footer__list a:hover {
  color: var(--paper);
  border-bottom-color: var(--signal);
}

.footer__list a[aria-current="page"] {
  color: var(--sand);
  border-bottom-color: var(--sand);
}

.footer__contact-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 10px;
  margin-bottom: 12px;
  font-size: 14px;
  line-height: 1.6;
}

.footer__key {
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  line-height: 1.9;
  text-transform: uppercase;
}

.footer__value {
  color: var(--paper);
  word-break: break-word;
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 24px;
  width: 100%;
  max-width: var(--w-max);
  margin: 0 auto;
  padding: 18px var(--pad) 32px;
  border-top: 1px solid rgba(127, 211, 216, 0.16);
  color: var(--mist);
  font-size: 12px;
  line-height: 1.6;
}

.footer__copy { letter-spacing: 0.04em; }

.footer__icp {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.footer__domain {
  margin-left: auto;
  color: var(--teal-bright);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* ---------- 9. 显现动效 ---------- */
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.3s ease-out, transform 0.3s ease-out;
}

html.has-js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1200px) {
  .main-nav__link { padding: 9px 10px; font-size: 14px; }
  .footer__inner { gap: 32px; }
}

@media (max-width: 1024px) {
  .section { padding: 72px 0; }

  .grid--split,
  .grid--split-rev,
  .grid--thirds,
  .grid--halves { grid-template-columns: minmax(0, 1fr); }

  .rail { position: static; top: auto; }

  .util-band__meta { display: none; }
  .util-band__cta { margin-left: auto; }

  .nav-toggle { display: inline-flex; margin-left: auto; }
  .signal-lamp { display: none; }

  .nav-band__inner { min-height: 54px; }

  .main-nav {
    position: fixed;
    inset: 0;
    z-index: 1;
    display: block;
    padding: 116px var(--pad) 48px;
    overflow-y: auto;
    background-color: var(--ink-900);
    background-image:
      radial-gradient(760px 420px at 90% 0%, rgba(30, 127, 140, 0.34), transparent 70%),
      radial-gradient(520px 320px at 0% 100%, rgba(255, 90, 54, 0.14), transparent 72%);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 0.22s ease-out, transform 0.22s ease-out, visibility 0.22s ease-out;
  }

  .site-header[data-open] .main-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .main-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-width: 560px;
    margin: 0 auto;
    border-top: 1px solid rgba(127, 211, 216, 0.18);
  }

  .main-nav__link {
    padding: 18px 6px;
    border-bottom: 1px solid rgba(127, 211, 216, 0.14);
    border-left: 3px solid transparent;
    border-radius: 0;
    font-size: 21px;
    font-weight: 700;
  }

  .main-nav__link[aria-current="page"] {
    border-bottom-color: rgba(232, 185, 106, 0.4);
    border-left-color: var(--sand);
    background: rgba(232, 185, 106, 0.1);
  }

  .footer__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
    padding-top: 52px;
  }

  .footer__summary { max-width: 46ch; }
}

@media (max-width: 640px) {
  .section { padding: 56px 0; }

  .brand__tag { display: none; }
  .brand__name { font-size: 14px; }
  .util-band__cta { padding: 7px 12px; font-size: 12px; }

  .nav-toggle__label { display: none; }
  .nav-toggle { padding: 9px 10px; }

  .main-nav { padding-top: 104px; }
  .main-nav__link { font-size: 19px; padding: 16px 4px; }

  .footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__contact-list li { grid-template-columns: 40px minmax(0, 1fr); }
  .footer__domain { margin-left: 0; }
  .card { padding: 20px; }
  .data-table th,
  .data-table td { padding: 10px; }
}

/* ---------- 11. 减少动效 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .signal-lamp__dot { animation: none; box-shadow: none; }
  .progress-bar__fill { transition: none; }

  html.has-js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}