/* ============================================================
   haohan-league.com.cn — /assets/site.css
   高原夜赛数据台：夜空蓝基底 + 经幡五色细节点
   ============================================================ */

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

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

body { margin: 0; }

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

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

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

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

table { border-collapse: collapse; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 品牌色 */
  --night: #0B1B33;
  --ink: #050B14;
  --snow: #F7FAFD;
  --mist: #C7D3E0;
  --flag-blue: #3B82F6;
  --signal-red: #D93A32;
  --amber: #F2B134;
  --teal: #18A999;
  --cold: #DDF3FF;
  --paper: #EDE6D6;

  /* 半透明层 */
  --line-soft: rgba(199, 211, 224, 0.16);
  --line-mid: rgba(199, 211, 224, 0.28);
  --line-strong: rgba(221, 243, 255, 0.42);

  /* 字体 */
  --font-display: "HarmonyOS Sans SC", "Alibaba PuHuiTi 3.0", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 尺寸 */
  --w-max: 1440px;
  --gutter: clamp(16px, 4vw, 32px);
  --header-h: 60px;
  --radius: 2px;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

@media (min-width: 1024px) {
  :root { --header-h: 72px; }
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--night);
  color: var(--snow);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--snow);
}

h1 { font-size: clamp(2.25rem, 6vw, 4.5rem); font-weight: 900; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.125rem, 2vw, 1.5rem); font-weight: 700; }

strong { font-weight: 700; color: var(--cold); }

::selection {
  background: var(--flag-blue);
  color: #FFFFFF;
}

/* ---------- 4. 工具件 ---------- */
.container {
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.mono {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  flex: 0 0 auto;
  background: linear-gradient(90deg, var(--flag-blue), var(--teal));
}

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 300;
  padding: 0.75rem 1.25rem;
  background: var(--cold);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  transform: translateY(-140%);
  transition: transform 0.18s var(--ease);
}

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

/* ---------- 6. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  color: var(--snow);
  background: transparent;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(5, 11, 20, 0.96) 0%, rgba(5, 11, 20, 0.9) 62%, rgba(5, 11, 20, 0.62) 100%);
  opacity: 0.55;
  transition: opacity 0.22s var(--ease);
}

.site-header[data-scrolled]::before {
  opacity: 1;
}

.site-header[data-scrolled] {
  backdrop-filter: blur(10px) saturate(130%);
  -webkit-backdrop-filter: blur(10px) saturate(130%);
  box-shadow:
    0 1px 0 var(--line-soft),
    0 22px 44px -30px #000000;
}

.site-header__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  min-height: var(--header-h);
  padding: 0.5rem var(--gutter);
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 24px);
}

.site-header__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  height: 2px;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--flag-blue), var(--teal), var(--amber), var(--signal-red));
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  flex: 0 0 auto;
  padding: 0.3rem 0;
  border-radius: var(--radius);
}

.brand__mark {
  display: grid;
  grid-template-rows: repeat(5, 1fr);
  gap: 2px;
  width: 13px;
  height: 30px;
  flex: 0 0 auto;
}

.brand__flag {
  display: block;
  border-radius: 1px;
}

.brand__flag--blue { background: var(--flag-blue); }
.brand__flag--white { background: var(--snow); }
.brand__flag--red { background: var(--signal-red); }
.brand__flag--green { background: var(--teal); }
.brand__flag--yellow { background: var(--amber); }

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--snow);
}

.brand__line {
  margin-top: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.26em;
  color: var(--mist);
}

.brand__badge {
  align-self: flex-start;
  margin-top: 0.1rem;
  padding: 0.1rem 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--amber);
  border: 1px solid rgba(5, 11, 20, 0.3);
  border-radius: 1px;
  transform: rotate(-2deg);
}

/* 头部三段短词 */
.header-utility {
  display: none;
  align-items: center;
  gap: 0.55rem;
  margin-inline-start: clamp(8px, 2vw, 24px);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  white-space: nowrap;
}

.header-utility__item { color: var(--mist); }
.header-utility__item--blue { color: #7FB2FF; }
.header-utility__item--teal { color: #5FD6C8; }
.header-utility__item--amber { color: #F6C76A; }

.header-utility__sep {
  color: rgba(199, 211, 224, 0.35);
}

@media (min-width: 1024px) {
  .header-utility { display: flex; }
}

/* 移动导航按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-inline-start: auto;
  padding: 0.5rem 0.7rem;
  color: var(--snow);
  background: rgba(59, 130, 246, 0.16);
  border: 1px solid var(--line-mid);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.nav-toggle:hover {
  background: rgba(59, 130, 246, 0.3);
  border-color: var(--line-strong);
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  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:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* 主导航：移动端为下拉时间轴抽屉 */
.primary-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 2;
  max-height: 0;
  visibility: hidden;
  overflow: hidden;
  background: rgba(5, 11, 20, 0.985);
  border-bottom: 1px solid var(--line-mid);
  transition: max-height 0.28s var(--ease), visibility 0s linear 0.3s;
}

.primary-nav[data-open] {
  max-height: min(78vh, 660px);
  visibility: visible;
  overflow-y: auto;
  transition: max-height 0.28s var(--ease);
}

.primary-nav__list {
  position: relative;
  padding: 0.9rem var(--gutter) 0.5rem;
}

.primary-nav__list::before {
  content: "";
  position: absolute;
  left: calc(var(--gutter) + 13px);
  top: 1.1rem;
  bottom: 1.1rem;
  width: 2px;
  background: linear-gradient(180deg, var(--flag-blue), var(--teal), var(--amber), var(--signal-red));
  opacity: 0.45;
}

.primary-nav__item {
  border-bottom: 1px dashed rgba(199, 211, 224, 0.14);
}

.primary-nav__item:last-child {
  border-bottom: 0;
}

.primary-nav__link {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.85rem 0;
  color: var(--snow);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: color 0.16s var(--ease), background-color 0.16s var(--ease);
}

.primary-nav__index {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--cold);
  background: rgba(11, 27, 51, 0.92);
  border: 1px solid var(--line-strong);
  border-radius: 50%;
}

.primary-nav__label {
  letter-spacing: 0.02em;
}

.primary-nav__link:hover {
  color: var(--cold);
}

.primary-nav__link:hover .primary-nav__index {
  border-color: var(--cold);
}

.primary-nav__link[aria-current="page"] {
  color: var(--cold);
}

.primary-nav__link[aria-current="page"] .primary-nav__index {
  color: var(--ink);
  background: var(--cold);
  border-color: var(--cold);
}

.primary-nav__link[aria-current="page"]::after {
  content: "";
  width: 6px;
  height: 6px;
  margin-inline-start: auto;
  border-radius: 50%;
  background: var(--flag-blue);
}

.primary-nav__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem var(--gutter) 1.35rem;
  border-top: 1px solid var(--line-soft);
}

.primary-nav__meta {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--mist);
}

/* 主导航：桌面横向索引 */
@media (min-width: 1024px) {
  .nav-toggle { display: none; }

  .primary-nav {
    position: static;
    display: flex;
    align-items: center;
    gap: clamp(6px, 1.2vw, 18px);
    margin-inline-start: auto;
    max-height: none;
    visibility: visible;
    overflow: visible;
    background: transparent;
    border-bottom: 0;
    transition: none;
  }

  .primary-nav__list {
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 0;
  }

  .primary-nav__list::before { display: none; }

  .primary-nav__item { border-bottom: 0; }

  .primary-nav__link {
    gap: 0.3rem;
    padding: 0.5rem 0.55rem;
    font-size: 0.9375rem;
    color: var(--mist);
  }

  .primary-nav__link:hover {
    color: var(--snow);
    background: rgba(59, 130, 246, 0.18);
  }

  .primary-nav__index {
    width: auto;
    height: auto;
    border: 0;
    border-radius: 0;
    background: none;
    font-size: 0.5625rem;
    color: rgba(199, 211, 224, 0.5);
  }

  .primary-nav__link:hover .primary-nav__index {
    color: var(--cold);
  }

  .primary-nav__link[aria-current="page"] {
    color: var(--ink);
    background: var(--cold);
  }

  .primary-nav__link[aria-current="page"] .primary-nav__index {
    color: rgba(5, 11, 20, 0.62);
    background: none;
    border-color: transparent;
  }

  .primary-nav__link[aria-current="page"]::after { display: none; }

  .primary-nav__foot {
    padding: 0;
    margin-inline-start: 0.5rem;
    border-top: 0;
  }

  .primary-nav__meta { display: none; }
}

@media (max-width: 1023.98px) {
  body.is-nav-open { overflow: hidden; }
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.62rem 1.05rem;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  white-space: nowrap;
  transition:
    background-color 0.18s var(--ease),
    color 0.18s var(--ease),
    border-color 0.18s var(--ease),
    transform 0.18s var(--ease),
    box-shadow 0.18s var(--ease);
}

.btn--flag {
  color: #FFFFFF;
  background: var(--flag-blue);
  border-color: rgba(221, 243, 255, 0.38);
  box-shadow: 0 2px 0 0 rgba(5, 11, 20, 0.55);
}

.btn--flag:hover {
  background: #2F6FDC;
  transform: translateY(-1px);
}

.btn--ghost {
  color: var(--snow);
  background: transparent;
  border-color: var(--line-mid);
}

.btn--ghost:hover {
  color: var(--cold);
  border-color: var(--cold);
}

.btn--amber {
  color: var(--ink);
  background: var(--amber);
  border-color: rgba(5, 11, 20, 0.25);
}

.btn--amber:hover {
  background: #FFC24D;
  transform: translateY(-1px);
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--ink);
  color: var(--mist);
  border-top: 1px solid var(--line-soft);
}

.footer__flags {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  height: 3px;
}

.footer__flag {
  display: block;
  height: 100%;
}

.footer__flag--blue { background: var(--flag-blue); }
.footer__flag--white { background: var(--snow); }
.footer__flag--red { background: var(--signal-red); }
.footer__flag--green { background: var(--teal); }
.footer__flag--yellow { background: var(--amber); }

.footer__inner {
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding: clamp(2rem, 5vw, 3.75rem) var(--gutter) clamp(1.5rem, 3vw, 2.5rem);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 4vw, 3.5rem);
}

@media (min-width: 900px) {
  .footer__inner {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
}

.footer__brand-name {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--snow);
}

.footer__desc {
  margin-top: 0.85rem;
  max-width: 36ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mist);
}

.footer__note {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  max-width: 40ch;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: rgba(199, 211, 224, 0.82);
  background: rgba(242, 177, 52, 0.07);
  border-left: 3px solid var(--amber);
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: clamp(1.5rem, 3vw, 2rem);
}

.footer__col {
  min-width: 0;
}

.footer__col--wide .footer__contact {
  max-width: 38rem;
}

.footer__col-title {
  margin-bottom: 0.85rem;
  padding-bottom: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 800;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cold);
  border-bottom: 1px solid var(--line-soft);
}

.footer__links {
  display: grid;
  gap: 0.5rem;
}

.footer__link {
  display: inline-block;
  padding: 0.15rem 0;
  font-size: 0.9375rem;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.footer__link:hover {
  color: var(--snow);
  border-bottom-color: var(--flag-blue);
}

.footer__contact {
  display: grid;
  gap: 0.85rem;
}

.contact-row {
  display: grid;
  gap: 0.15rem;
}

.contact-row__label {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(199, 211, 224, 0.6);
}

.contact-row__value {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--snow);
}

.copy-btn {
  padding: 0.15rem 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cold);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.16s var(--ease), color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.copy-btn:hover {
  color: var(--ink);
  background: var(--cold);
  border-color: var(--cold);
}

.copy-btn[data-copied] {
  color: #04120F;
  background: var(--teal);
  border-color: var(--teal);
}

.to-top {
  position: fixed;
  right: clamp(12px, 3vw, 28px);
  bottom: clamp(12px, 3vw, 28px);
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--cold);
  background: rgba(5, 11, 20, 0.92);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.to-top[data-visible] {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.to-top:hover {
  color: var(--ink);
  background: var(--cold);
}

.footer__bottom {
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding: 1rem var(--gutter) 1.75rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 1.25rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: rgba(199, 211, 224, 0.7);
}

.footer__icp {
  margin-inline-end: auto;
}

.footer__meta {
  display: inline-flex;
  align-items: center;
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb {
  padding-block: 0.9rem;
  border-bottom: 1px solid var(--line-soft);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: rgba(199, 211, 224, 0.4);
}

.breadcrumb__link {
  color: var(--cold);
  border-bottom: 1px solid transparent;
}

.breadcrumb__link:hover {
  border-bottom-color: var(--cold);
}

.breadcrumb__current {
  color: var(--snow);
}

/* ---------- 10. 正文容器 ---------- */
.prose {
  max-width: 38em;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--snow);
}

.prose > * + * {
  margin-top: 1.05em;
}

.prose h2 {
  margin-top: 2em;
  font-size: clamp(1.375rem, 2.4vw, 1.75rem);
}

.prose h3 {
  margin-top: 1.8em;
  font-size: 1.125rem;
}

.prose ul,
.prose ol {
  padding-inline-start: 1.15em;
  list-style: disc;
}

.prose ol { list-style: decimal; }

.prose li + li { margin-top: 0.4em; }

.prose a {
  color: var(--cold);
  border-bottom: 1px solid var(--flag-blue);
}

.prose--tight {
  font-size: 1rem;
  line-height: 1.8;
}

/* ---------- 11. 网格 ---------- */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1rem, 2.5vw, 1.75rem);
}

.grid--split { grid-template-columns: 1fr; }
.grid--halves { grid-template-columns: 1fr; }
.grid--rail { grid-template-columns: 1fr; }

@media (min-width: 900px) {
  .grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
  .grid--halves { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .grid--rail { grid-template-columns: minmax(0, 1fr) minmax(0, 3fr); }
}

/* ---------- 12. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background:
    radial-gradient(120% 90% at 18% 12%, rgba(59, 130, 246, 0.22), transparent 62%),
    linear-gradient(160deg, rgba(24, 169, 153, 0.14), rgba(11, 27, 51, 0.95));
  border: 1px solid var(--line-mid);
  border-radius: var(--radius);
}

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

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame--paper {
  background: var(--paper);
  border-color: rgba(5, 11, 20, 0.22);
}

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  max-width: 100%;
  padding: 0.4rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--mist);
  background: rgba(5, 11, 20, 0.8);
}

/* ---------- 13. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.18rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cold);
  border: 1px solid currentColor;
  border-radius: var(--radius);
}

.tag--red { color: var(--signal-red); }
.tag--amber { color: var(--amber); }
.tag--teal { color: var(--teal); }
.tag--blue { color: var(--flag-blue); }
.tag--cold { color: var(--cold); }

/* ---------- 14. 焦点可见 ---------- */
:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--cold);
  outline-offset: 3px;
  border-radius: var(--radius);
}

.primary-nav__link[aria-current="page"]:focus-visible,
.btn--flag:focus-visible,
.btn--amber:focus-visible {
  outline-color: var(--ink);
}

/* ---------- 15. 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;
    transition-delay: 0s !important;
    scroll-behavior: auto !important;
  }
}