/* ============================================================
   TVT体育 · /assets/site.css
   共享外壳样式：reset / 变量 / 中文排版 / 头部 / 页脚 /
   通用按钮 / 面包屑 / 正文容器 / 网格 / 基础组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; background: #0E1633; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, figcaption, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; height: 1px; background: currentColor; opacity: .2; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 品牌色 */
  --ink: #0E1633;
  --ink-deep: #090F26;
  --indigo: #241B52;
  --teal: #06322E;
  --wine: #5A1B2E;
  --cyan: #35F0D0;
  --cyan-deep: #0C7F71;
  --orange: #FF8B3D;
  --orange-deep: #B04E10;
  --mist: #F5F7FC;
  --graphite: #2A2F3D;
  --silver: #C7CEDD;
  --green: #6EE7A8;
  --green-deep: #1B7A4C;

  /* 语义 */
  --line-dark: rgba(199, 206, 221, .22);
  --line-light: rgba(14, 22, 51, .18);
  --text-on-dark: rgba(245, 247, 252, .84);
  --text-on-dark-dim: rgba(245, 247, 252, .62);

  /* 字体 */
  --font-head: "HarmonyOS Sans SC", "Alibaba PuHuiTi", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  /* 尺度 */
  --edge: 20px;
  --gap: 20px;
  --header-h: 68px;
  --radius: 6px;
  --radius-pill: 999px;
  --ease-out: cubic-bezier(.22, .8, .28, 1);

  /* 阴影 */
  --shadow-hard: 6px 6px 0 0 rgba(9, 15, 38, .92);
  --shadow-hard-lg: 10px 10px 0 0 rgba(9, 15, 38, .92);
  --shadow-dock: 0 24px 48px -28px rgba(0, 0, 0, .95);

  /* 焦点 */
  --focus-ring: 3px solid var(--cyan);
  --focus-offset: 3px;
}

@media (min-width: 640px) {
  :root { --edge: 32px; --gap: 24px; }
}
@media (min-width: 1024px) {
  :root { --edge: 5vw; --gap: 28px; --header-h: 78px; }
}

/* ---------- 3. 中文排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .012em;
  color: var(--graphite);
  background: var(--mist);
  min-height: 100vh;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
@media (min-width: 1024px) { body { font-size: 17px; } }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.018em;
  color: var(--ink);
  text-wrap: balance;
}
h1 { font-size: clamp(30px, 4.6vw, 56px); }
h2 { font-size: clamp(26px, 3.4vw, 44px); }
h3 { font-size: clamp(20px, 2vw, 24px); }
h4 { font-size: 18px; }
p { text-wrap: pretty; }

.display {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(44px, 8vw, 132px);
  line-height: .92;
  letter-spacing: -.038em;
  text-transform: none;
}
.lede {
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.8;
  color: inherit;
  opacity: .86;
  max-width: 62ch;
}

/* 等宽索引体系 */
.mono,
.section-index,
.eyebrow,
.stat__value,
.stat__label,
.badge,
.footer-col__title,
.footer-meta,
.media-frame__badge,
.media-frame__caption,
.primary-nav__index,
.brand__line,
.tabs__tab-index,
.breadcrumbs {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.section-index {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan-deep);
}
.section-index::before {
  content: "";
  display: block;
  width: 34px;
  height: 2px;
  background: currentColor;
}
.eyebrow {
  display: block;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan-deep);
}

/* ---------- 4. 布局基础 ---------- */
.container {
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: var(--edge);
}
.container--narrow { max-width: 880px; }
.container--wide { max-width: 1560px; }

.site-main {
  display: block;
  padding-top: 104px;
}
@media (min-width: 1024px) { .site-main { padding-top: 124px; } }

.section {
  position: relative;
  padding-block: clamp(52px, 8vw, 116px);
}
.section--tight { padding-block: clamp(34px, 5vw, 64px); }

.section--ink { background: var(--ink); color: var(--text-on-dark); }
.section--indigo { background: var(--indigo); color: var(--text-on-dark); }
.section--teal { background: var(--teal); color: var(--text-on-dark); }
.section--wine { background: var(--wine); color: var(--text-on-dark); }
.section--mist { background: var(--mist); color: var(--graphite); }

.section--ink :is(h1, h2, h3, h4),
.section--indigo :is(h1, h2, h3, h4),
.section--teal :is(h1, h2, h3, h4),
.section--wine :is(h1, h2, h3, h4) { color: #fff; }

.section--ink .section-index,
.section--indigo .section-index,
.section--teal .section-index,
.section--wine .section-index,
.section--ink .eyebrow,
.section--indigo .eyebrow,
.section--teal .eyebrow,
.section--wine .eyebrow { color: var(--cyan); }

.section__head {
  display: grid;
  gap: 14px;
  max-width: 68ch;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}
@media (max-width: 767px) {
  .grid-12 { grid-template-columns: 1fr; }
}

.visually-hidden {
  position: absolute !important;
  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;
}

/* ---------- 5. 焦点与跳转 ---------- */
:where(a, button, [tabindex], summary, input, select, textarea):focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius);
}

.skip-link {
  position: fixed;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  padding: 12px 24px 14px;
  border-radius: 0 0 16px 16px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: .04em;
  box-shadow: 0 14px 30px -12px rgba(0, 0, 0, .8);
  transition: top .2s var(--ease-out);
}
.skip-link:focus { top: 0; }

/* ---------- 6. 按钮与链接 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 22px;
  border: 2px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .03em;
  cursor: pointer;
  text-align: center;
  white-space: nowrap;
  transition: transform .18s var(--ease-out), box-shadow .18s var(--ease-out),
              background-color .18s, color .18s, border-color .18s;
}
.btn--primary {
  background: var(--cyan);
  color: var(--ink);
  border-color: var(--cyan);
  box-shadow: 4px 4px 0 0 rgba(53, 240, 208, .3);
}
.btn--primary:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 0 rgba(53, 240, 208, .36);
}
.btn--outline {
  background: transparent;
  color: currentColor;
  border-color: rgba(199, 206, 221, .55);
}
.btn--outline:hover {
  border-color: var(--cyan);
  color: #fff;
  background: rgba(53, 240, 208, .14);
}
.section--mist .btn--outline { color: var(--ink); border-color: rgba(14, 22, 51, .42); }
.section--mist .btn--outline:hover { border-color: var(--ink); background: rgba(14, 22, 51, .08); color: var(--ink); }
.btn--ghost {
  background: rgba(245, 247, 252, .08);
  color: currentColor;
  border-color: rgba(199, 206, 221, .35);
}
.btn--ghost:hover { background: rgba(53, 240, 208, .16); color: #fff; }
.btn--sm { min-height: 40px; padding: 0 16px; font-size: 13px; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding-bottom: 2px;
  font-family: var(--font-head);
  font-weight: 800;
  color: inherit;
  border-bottom: 2px solid var(--cyan);
  transition: color .18s;
}
.link-arrow::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform .18s var(--ease-out);
}
.link-arrow:hover::after { transform: translateX(5px); }

/* ---------- 7. 面包屑 ---------- */
.breadcrumbs {
  padding-block: 16px;
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(42, 47, 61, .76);
}
.section--ink .breadcrumbs,
.section--indigo .breadcrumbs,
.section--teal .breadcrumbs,
.section--wine .breadcrumbs { color: var(--text-on-dark-dim); }
.breadcrumbs__list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumbs__item { display: inline-flex; align-items: center; }
.breadcrumbs__item:not(:first-child)::before {
  content: "/";
  margin-inline-end: 8px;
  opacity: .45;
}
.breadcrumbs__link { opacity: .76; border-bottom: 1px solid transparent; }
.breadcrumbs__link:hover { opacity: 1; border-bottom-color: var(--cyan); }
.breadcrumbs__current { color: var(--cyan-deep); }
.section--ink .breadcrumbs__current,
.section--indigo .breadcrumbs__current,
.section--teal .breadcrumbs__current,
.section--wine .breadcrumbs__current { color: var(--cyan); }

/* ---------- 8. 基础组件 ---------- */
.card {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px);
  background: #fff;
  color: var(--graphite);
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
}
.card :is(h2, h3, h4) { color: var(--ink); }
.card--dark {
  background: var(--ink);
  color: var(--text-on-dark);
  border-color: rgba(53, 240, 208, .55);
  box-shadow: var(--shadow-hard-lg);
}
.card--dark :is(h2, h3, h4) { color: #fff; }
.card--lift { transition: transform .22s var(--ease-out), box-shadow .22s var(--ease-out); }
.card--lift:hover { transform: translate(-3px, -3px); box-shadow: 12px 12px 0 0 rgba(9, 15, 38, .92); }
.card__title { font-size: 20px; margin-bottom: 8px; }
.card__body { font-size: 15.5px; line-height: 1.75; opacity: .88; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  border: 1px solid currentColor;
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  line-height: 1.6;
}
.badge--cyan { color: var(--cyan-deep); background: rgba(53, 240, 208, .2); border-color: rgba(12, 127, 113, .38); }
.badge--orange { color: var(--orange-deep); background: rgba(255, 139, 61, .18); border-color: rgba(255, 139, 61, .5); }
.badge--green { color: var(--green-deep); background: rgba(110, 231, 168, .22); border-color: rgba(110, 231, 168, .55); }
:is(.section--ink, .section--indigo, .section--teal, .section--wine, .site-footer) .badge--cyan {
  color: var(--cyan);
  background: rgba(53, 240, 208, .12);
  border-color: rgba(53, 240, 208, .45);
}
:is(.section--ink, .section--indigo, .section--teal, .section--wine, .site-footer) .badge--orange {
  color: var(--orange);
  background: rgba(255, 139, 61, .12);
  border-color: rgba(255, 139, 61, .5);
}

.stat { display: grid; gap: 6px; }
.stat__value {
  font-size: clamp(28px, 3.8vw, 48px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--ink);
}
.stat__label {
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  opacity: .68;
}
.section--ink .stat__value,
.section--indigo .stat__value,
.section--teal .stat__value,
.section--wine .stat__value { color: var(--cyan); }
.section--ink .stat__label,
.section--indigo .stat__label,
.section--teal .stat__label,
.section--wine .stat__label { color: var(--text-on-dark-dim); opacity: 1; }

.meter {
  position: relative;
  display: block;
  width: 100%;
  height: 12px;
  border: 2px solid var(--ink);
  border-radius: var(--radius-pill);
  background: rgba(14, 22, 51, .08);
  overflow: hidden;
}
.meter__fill {
  display: block;
  height: 100%;
  width: var(--value, 0%);
  background: linear-gradient(90deg, var(--cyan), #22c9ae);
  transition: width .9s var(--ease-out);
}
.meter__fill--orange { background: linear-gradient(90deg, var(--orange), #ffb573); }
.section--ink .meter,
.section--indigo .meter,
.section--teal .meter,
.section--wine .meter { border-color: rgba(199, 206, 221, .5); background: rgba(245, 247, 252, .1); }

.theme-band {
  position: relative;
  background: var(--indigo);
  color: #fff;
  border-block: 2px solid var(--line-dark);
  padding-block: 20px;
  overflow: hidden;
}
.theme-band__track {
  display: flex;
  align-items: center;
  gap: 40px;
  overflow-x: auto;
  padding-inline: var(--edge);
  scrollbar-width: thin;
}
.theme-band__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.theme-band__item::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  flex: 0 0 auto;
}
.theme-band__item:nth-child(even)::before { background: var(--orange); }

.diagonal-band {
  height: clamp(64px, 10vw, 132px);
  background: linear-gradient(96deg, var(--ink) 0%, var(--indigo) 46%, var(--teal) 100%);
  clip-path: polygon(0 36%, 100% 0, 100% 64%, 0 100%);
  margin-block: -1px;
}

/* ---------- 9. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  background: linear-gradient(140deg, var(--ink) 0%, var(--indigo) 52%, var(--teal) 100%);
  box-shadow: var(--shadow-hard);
}
.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tinted > img { filter: saturate(.55) contrast(1.08); }
.media-frame--tinted::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(14, 22, 51, .12), rgba(6, 50, 46, .58));
  mix-blend-mode: multiply;
  pointer-events: none;
}
.media-frame--grain::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: .16;
  background-image: repeating-linear-gradient(0deg, rgba(255, 255, 255, .55) 0 1px, transparent 1px 3px);
}
.media-frame__badge {
  position: absolute;
  z-index: 3;
  left: 14px;
  bottom: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  background: rgba(9, 15, 38, .9);
  color: var(--cyan);
  border: 1px solid rgba(53, 240, 208, .5);
  font-size: 12px;
  letter-spacing: .1em;
}
.media-frame__caption {
  position: absolute;
  z-index: 3;
  right: 14px;
  top: 14px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: rgba(9, 15, 38, .74);
  color: var(--mist);
  font-size: 11px;
  letter-spacing: .1em;
}

/* ---------- 10. 标签页 ---------- */
.tabs { display: grid; gap: 20px; }
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  width: max-content;
  max-width: 100%;
  padding: 5px;
  border: 2px solid var(--ink);
  border-radius: var(--radius-pill);
  background: #fff;
  box-shadow: 4px 4px 0 0 rgba(9, 15, 38, .88);
}
.tabs__tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 18px;
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 800;
  color: var(--graphite);
  cursor: pointer;
  white-space: nowrap;
  transition: background-color .18s, color .18s;
}
.tabs__tab:hover { background: rgba(53, 240, 208, .18); }
.tabs__tab[aria-selected="true"] { background: var(--ink); color: var(--cyan); }
.tabs__tab-index { font-size: 11px; opacity: .6; }
.tabs__panel[hidden] { display: none; }
.tabs__panels { display: block; }

.tabs--dark .tabs__list {
  background: rgba(9, 15, 38, .72);
  border-color: rgba(199, 206, 221, .32);
  box-shadow: 4px 4px 0 0 rgba(53, 240, 208, .22);
}
.tabs--dark .tabs__tab { color: var(--text-on-dark); }
.tabs--dark .tabs__tab:hover { background: rgba(53, 240, 208, .14); }
.tabs--dark .tabs__tab[aria-selected="true"] { background: var(--cyan); color: var(--ink); }

/* ---------- 11. 折叠面板 ---------- */
.accordion { display: grid; gap: 12px; }
.accordion__item {
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 5px 5px 0 0 rgba(9, 15, 38, .86);
  overflow: hidden;
}
.section--ink .accordion__item,
.section--indigo .accordion__item,
.section--teal .accordion__item,
.section--wine .accordion__item {
  background: rgba(245, 247, 252, .05);
  border-color: rgba(199, 206, 221, .38);
  box-shadow: 5px 5px 0 0 rgba(0, 0, 0, .5);
}
.accordion__heading { font-size: inherit; font-weight: inherit; letter-spacing: normal; line-height: inherit; }
.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  min-height: 58px;
  padding: 14px 18px;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
  transition: background-color .18s;
}
.section--ink .accordion__trigger,
.section--indigo .accordion__trigger,
.section--teal .accordion__trigger,
.section--wine .accordion__trigger { color: #fff; }
.accordion__trigger:hover { background: rgba(53, 240, 208, .1); }
.accordion__q { flex: 1 1 auto; }
.accordion__icon {
  position: relative;
  flex: 0 0 auto;
  width: 24px;
  height: 24px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  transition: background-color .2s var(--ease-out), border-color .2s;
}
.section--ink .accordion__icon,
.section--indigo .accordion__icon,
.section--teal .accordion__icon,
.section--wine .accordion__icon { border-color: var(--cyan); }
.accordion__icon::before,
.accordion__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--ink);
  border-radius: 2px;
  transform: translate(-50%, -50%);
  transition: opacity .2s;
}
.section--ink .accordion__icon::before,
.section--ink .accordion__icon::after,
.section--indigo .accordion__icon::before,
.section--indigo .accordion__icon::after,
.section--teal .accordion__icon::before,
.section--teal .accordion__icon::after,
.section--wine .accordion__icon::before,
.section--wine .accordion__icon::after { background: var(--cyan); }
.accordion__icon::before { width: 10px; height: 2px; }
.accordion__icon::after { width: 2px; height: 10px; }
.accordion__trigger[aria-expanded="true"] .accordion__icon { background: var(--cyan); }
.accordion__trigger[aria-expanded="true"] .accordion__icon::before,
.accordion__trigger[aria-expanded="true"] .accordion__icon::after { background: var(--ink); }
.accordion__trigger[aria-expanded="true"] .accordion__icon::after { opacity: 0; }

.accordion__panel[hidden] { display: none; }
.accordion__panel:not([hidden]) { animation: panel-in .24s var(--ease-out); }
@keyframes panel-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}
.accordion__body {
  padding: 0 18px 20px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--graphite);
}
.section--ink .accordion__body,
.section--indigo .accordion__body,
.section--teal .accordion__body,
.section--wine .accordion__body { color: var(--text-on-dark); }

/* ---------- 12. 显现动效协议 ---------- */
[data-reveal] {
  transition: opacity .55s var(--ease-out), transform .55s var(--ease-out);
}
[data-reveal="pending"] { opacity: 0; transform: translateY(16px); }
[data-reveal="in"] { opacity: 1; transform: none; }

/* ---------- 13. 头部：悬浮胶囊导航 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  padding: 12px var(--edge) 0;
  pointer-events: none;
}
.site-header__inner {
  position: relative;
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  width: min(1200px, calc(100% - var(--edge) * 2));
  min-height: 60px;
  margin-inline-start: auto;
  padding: 6px 8px 6px 14px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-pill);
  background: rgba(14, 22, 51, .74);
  box-shadow: var(--shadow-dock), inset 0 1px 0 rgba(255, 255, 255, .06);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  transition: background-color .28s var(--ease-out), box-shadow .28s var(--ease-out),
              padding .28s var(--ease-out), min-height .28s var(--ease-out);
}
.site-header.is-condensed { padding-top: 6px; }
.site-header.is-condensed .site-header__inner {
  min-height: 52px;
  padding: 4px 6px 4px 10px;
  background: rgba(9, 15, 38, .95);
  box-shadow: var(--shadow-dock), 0 0 0 1px rgba(53, 240, 208, .2);
  transition: background-color .28s var(--ease-out), box-shadow .28s var(--ease-out),
              padding .28s var(--ease-out), min-height .28s var(--ease-out);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 4px 6px 4px 0;
  border-radius: var(--radius-pill);
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--cyan) 0%, #1FA8CE 56%, var(--indigo) 100%);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  box-shadow: 0 0 0 1px rgba(53, 240, 208, .45), 0 10px 22px -12px rgba(53, 240, 208, .9);
  transition: width .28s var(--ease-out), height .28s var(--ease-out), font-size .28s var(--ease-out);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.16; }
.brand__name {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: .04em;
  color: #fff;
}
.brand__line {
  font-size: 10.5px;
  letter-spacing: .1em;
  color: var(--cyan);
  transition: opacity .24s var(--ease-out), max-height .24s var(--ease-out);
  max-height: 20px;
  overflow: hidden;
}
.site-header.is-condensed .brand__mark { width: 34px; height: 34px; font-size: 11px; border-radius: 11px; }
.site-header.is-condensed .brand__line { opacity: 0; max-height: 0; }

/* 导航 */
.primary-nav {
  flex: 1 1 auto;
  min-width: 0;
}
.primary-nav__list {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 2px;
}
.primary-nav__item { display: block; }
.primary-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 44px;
  padding: 0 13px;
  border-radius: var(--radius-pill);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  color: rgba(245, 247, 252, .82);
  white-space: nowrap;
  transition: color .2s, background-color .2s, box-shadow .2s, min-height .28s var(--ease-out);
}
.primary-nav__link:hover { color: #fff; background: rgba(53, 240, 208, .12); }
.primary-nav__link[aria-current="page"] {
  color: var(--ink);
  background: var(--cyan);
  box-shadow: 0 0 0 1px rgba(53, 240, 208, .55), 0 10px 22px -14px rgba(53, 240, 208, .95);
}
.primary-nav__index {
  font-size: 10px;
  letter-spacing: .06em;
  opacity: .58;
}
.primary-nav__link[aria-current="page"] .primary-nav__index { opacity: .78; }
.primary-nav__label { white-space: nowrap; }
.site-header.is-condensed .primary-nav__link { min-height: 38px; font-size: 13px; padding: 0 11px; }

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: var(--edge);
  right: var(--edge);
  bottom: -5px;
  height: 3px;
  border-radius: 3px;
  background: rgba(199, 206, 221, .16);
  overflow: hidden;
  pointer-events: none;
}
.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width .12s linear;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  min-height: 44px;
  min-width: 44px;
  padding: 0 15px;
  border: 1px solid rgba(199, 206, 221, .3);
  border-radius: var(--radius-pill);
  background: rgba(53, 240, 208, .1);
  color: #fff;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .06em;
  cursor: pointer;
  transition: background-color .2s, border-color .2s;
}
.nav-toggle:hover { background: rgba(53, 240, 208, .2); border-color: rgba(53, 240, 208, .6); }
.nav-toggle__text { line-height: 1; }
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
  height: 14px;
}
.nav-toggle__bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform .2s var(--ease-out), opacity .2s;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 14. 头部响应式 ---------- */
@media (max-width: 960px) {
  .site-header__inner {
    width: calc(100% - 24px);
    margin-inline: auto;
    justify-content: space-between;
    gap: 8px;
  }
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    display: none;
    padding: 10px;
    border: 1px solid var(--line-dark);
    border-radius: 22px;
    background: rgba(9, 15, 38, .97);
    box-shadow: 0 34px 64px -32px rgba(0, 0, 0, .96);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }
  .primary-nav[data-open="true"] { display: block; }
  .primary-nav__list { flex-direction: column; align-items: stretch; gap: 4px; }
  .primary-nav__link {
    width: 100%;
    justify-content: flex-start;
    min-height: 50px;
    padding: 0 16px;
    font-size: 15.5px;
  }
  .primary-nav__index { font-size: 11px; opacity: .7; }
  .site-header.is-condensed .primary-nav__link { min-height: 48px; font-size: 15px; padding: 0 16px; }
}
@media (max-width: 420px) {
  .brand__line { display: none; }
  .nav-toggle__text { display: none; }
  .nav-toggle { padding: 0 14px; }
}

/* ---------- 15. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--ink);
  color: var(--text-on-dark);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .55;
  background-image:
    linear-gradient(rgba(199, 206, 221, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(199, 206, 221, .06) 1px, transparent 1px);
  background-size: 64px 64px;
}
.footer-band {
  position: relative;
  height: 8px;
  background: linear-gradient(90deg,
    var(--cyan) 0 26%,
    var(--orange) 26% 40%,
    var(--indigo) 40% 72%,
    var(--wine) 72% 88%,
    var(--teal) 88% 100%);
}
.footer-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding: clamp(44px, 6vw, 72px) var(--edge) 36px;
}
.footer-top {
  display: grid;
  gap: 40px;
  grid-template-columns: 1fr;
}
@media (min-width: 900px) {
  .footer-top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.55fr);
    gap: 64px;
    align-items: start;
  }
}
.footer-brand { display: grid; gap: 18px; justify-items: start; }
.brand--stacked { padding: 0; }
.footer-brand__note {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-on-dark-dim);
  max-width: 34ch;
}
.footer-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.footer-cols {
  display: grid;
  gap: 30px;
  grid-template-columns: 1fr;
}
@media (min-width: 560px) { .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 820px) { .footer-cols { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.footer-col__title {
  margin-bottom: 14px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-col__list { display: grid; gap: 2px; }
.footer-col__link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 15px;
  color: var(--text-on-dark);
  border-bottom: 1px solid transparent;
  transition: color .18s, border-color .18s, padding-left .18s var(--ease-out);
}
.footer-col__link:hover {
  color: #fff;
  border-bottom-color: var(--cyan);
  padding-left: 4px;
}

.footer-meta {
  margin-top: clamp(36px, 5vw, 56px);
  padding-top: 24px;
  border-top: 1px solid var(--line-dark);
  display: grid;
  gap: 12px;
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--text-on-dark-dim);
}
.footer-meta__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 16px;
}
.footer-meta__row strong { color: var(--cyan); font-weight: 600; }
.footer-meta__k {
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(199, 206, 221, .68);
}
.footer-meta__row--split { justify-content: space-between; gap: 14px 20px; }
.footer-meta__copy { color: rgba(199, 206, 221, .74); }

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid rgba(199, 206, 221, .34);
  border-radius: var(--radius-pill);
  background: rgba(53, 240, 208, .08);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  cursor: pointer;
  transition: background-color .18s, border-color .18s, color .18s;
}
.to-top:hover { background: rgba(53, 240, 208, .2); border-color: var(--cyan); color: #fff; }

.footer-closing {
  margin-top: 24px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.6vw, 30px);
  font-weight: 900;
  letter-spacing: -.01em;
  color: rgba(245, 247, 252, .16);
}

/* ---------- 16. 帮助浮窗 ---------- */
.help-dock {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 70;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  pointer-events: none;
}
.help-dock > * { pointer-events: auto; }
.help-dock__panel {
  width: min(272px, calc(100vw - 36px));
  padding: 16px 16px 14px;
  border: 2px solid var(--cyan);
  border-radius: 18px;
  background: rgba(9, 15, 38, .97);
  color: var(--mist);
  box-shadow: 6px 6px 0 0 rgba(0, 0, 0, .6);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  animation: dock-in .2s var(--ease-out);
}
@keyframes dock-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}
.help-dock__title {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}
.help-dock__list { display: grid; gap: 4px; }
.help-dock__link {
  display: flex;
  align-items: center;
  min-height: 42px;
  padding: 0 12px;
  border-radius: 10px;
  font-size: 15px;
  color: var(--mist);
  background: rgba(53, 240, 208, .07);
  transition: background-color .18s, color .18s;
}
.help-dock__link:hover { background: rgba(53, 240, 208, .2); color: #fff; }
.help-dock__toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 48px;
  padding: 0 18px;
  border: 2px solid var(--cyan);
  border-radius: var(--radius-pill);
  background: rgba(14, 22, 51, .95);
  color: #fff;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .04em;
  cursor: pointer;
  box-shadow: 0 0 0 4px rgba(53, 240, 208, .12), var(--shadow-dock);
  transition: background-color .2s, box-shadow .2s;
}
.help-dock__toggle:hover { background: rgba(36, 27, 82, .96); box-shadow: 0 0 0 6px rgba(53, 240, 208, .18), var(--shadow-dock); }
.help-dock__dot {
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 139, 61, .24);
}
@media (max-width: 640px) {
  .help-dock__label { display: none; }
  .help-dock__toggle { padding: 0 15px; }
}

/* ---------- 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;
  }
  [data-reveal="pending"] { opacity: 1; transform: none; }
  .meter__fill { transition: none; }
  .scroll-progress__bar { transition: none; }
}