/* =========================================================
   华体育赛场 · 共享样式 /assets/site.css
   竞技场深蓝底 + 荧光青脉冲 + 炽热橙比分点
   ========================================================= */

/* ---------- 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, figure, blockquote,
dl, dd, ul, ol {
  margin: 0;
}

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

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

a { color: inherit; }

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

:focus-visible {
  outline: 2px solid var(--cyan-500);
  outline-offset: 3px;
}

/* ---------- 2. Design tokens ---------- */
:root {
  --arena-900: #071426;
  --arena-800: #0C2138;
  --arena-700: #17334F;
  --cyan-500: #35F2D0;
  --cyan-200: #8FF8E6;
  --orange-600: #FF5A1F;
  --orange-400: #FF8A3D;
  --paper: #F4F1EA;
  --mist: #9FB3C8;
  --line: #244866;

  --rail-w: 96px;
  --wrap: 1180px;
  --gutter: clamp(1.1rem, 4vw, 2.5rem);

  --font-sans: "Noto Sans SC", "Source Han 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, "Courier New", monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. Base ---------- */
html { background: var(--arena-900); }

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.75;
  color: var(--mist);
  background:
    radial-gradient(1200px 620px at 88% -12%, rgba(53, 242, 208, .08), transparent 62%),
    radial-gradient(900px 520px at -8% 104%, rgba(255, 90, 31, .07), transparent 66%),
    var(--arena-900);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

#main-content { flex: 1 0 auto; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--paper);
  line-height: 1.3;
  letter-spacing: .01em;
  font-weight: 800;
}

::selection {
  background: rgba(53, 242, 208, .28);
  color: var(--paper);
}

/* ---------- 4. Shared atoms ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .24em;
  line-height: 1.4;
  color: var(--cyan-200);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--orange-600);
  flex: 0 0 auto;
}

.data-figure {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(2rem, 6vw, 3.75rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan-500);
  font-variant-numeric: tabular-nums;
}

.section { padding-block: clamp(2.5rem, 6vw, 5rem); }

.section__title {
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  font-weight: 800;
  color: var(--paper);
}

/* buttons */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  padding: .72rem 1.35rem;
  font-family: var(--font-sans);
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .08em;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition: background-color .22s var(--ease), color .22s var(--ease),
    border-color .22s var(--ease), transform .22s var(--ease),
    box-shadow .22s var(--ease);
}

.btn::before {
  content: "";
  width: 6px;
  height: 6px;
  background: currentColor;
  transform: rotate(45deg);
  flex: 0 0 auto;
  opacity: .9;
}

.btn--signal {
  background: linear-gradient(120deg, var(--orange-600), var(--orange-400));
  color: #100D0B;
  clip-path: polygon(0 0, 100% 0, 100% 72%, calc(100% - 13px) 100%, 0 100%);
  padding-right: 1.7rem;
}

.btn--signal:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 26px rgba(255, 90, 31, .32);
}

.btn--ghost {
  background: rgba(53, 242, 208, .06);
  border-color: var(--line);
  color: var(--cyan-200);
}

.btn--ghost:hover {
  background: rgba(53, 242, 208, .13);
  border-color: rgba(53, 242, 208, .55);
  color: var(--paper);
}

/* ---------- 5. Skip link ---------- */
.skip-link {
  position: absolute;
  left: 50%;
  top: .6rem;
  z-index: 200;
  transform: translate(-50%, -220%);
  padding: .7rem 1.3rem;
  background: var(--cyan-500);
  color: #04121F;
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-decoration: none;
  border-radius: 2px;
  transition: transform .22s var(--ease);
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

/* ---------- 6. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--arena-900);
  border-bottom: 1px solid var(--line);
  color: var(--paper);
  transition: box-shadow .25s var(--ease), background-color .25s var(--ease);
}

.site-header.is-scrolled {
  background: #050F1D;
  box-shadow: 0 14px 34px rgba(0, 0, 0, .5);
}

/* 品牌层 */
.header-rail {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(112deg, rgba(53, 242, 208, .15) 0%, rgba(53, 242, 208, 0) 34%),
    linear-gradient(248deg, rgba(255, 90, 31, .17) 0%, rgba(255, 90, 31, 0) 40%),
    var(--arena-900);
}

.header-rail::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(100deg,
    transparent 0 57.6%,
    rgba(53, 242, 208, .09) 57.6% 58%,
    transparent 58% 100%);
}

.header-rail__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .9rem 1.5rem;
  max-width: calc(var(--wrap) + var(--gutter) * 2);
  margin-inline: auto;
  padding: 1.05rem var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .85rem;
  text-decoration: none;
  color: inherit;
  flex: 0 1 auto;
  min-width: 0;
}

.brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(53, 242, 208, .2), rgba(12, 33, 56, .94));
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.brand__mark::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan-500);
  box-shadow: 0 0 0 4px rgba(53, 242, 208, .14), 0 0 16px rgba(53, 242, 208, .85);
  animation: brand-pulse 2.9s var(--ease) infinite;
}

@keyframes brand-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(.66); opacity: .55; }
}

.brand__text { display: block; min-width: 0; }

.brand__name {
  display: block;
  font-family: var(--font-sans);
  font-size: 1.32rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: .02em;
  color: var(--paper);
}

.brand__cn {
  font-family: var(--font-mono);
  font-size: .7em;
  font-weight: 800;
  letter-spacing: .06em;
  color: var(--cyan-500);
  margin-left: .2em;
}

.brand__line {
  display: block;
  margin-top: .25rem;
  font-size: .72rem;
  letter-spacing: .26em;
  line-height: 1.4;
  color: var(--mist);
}

.header-rail__context {
  margin-left: auto;
  padding-left: 1.1rem;
  border-left: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  line-height: 1.5;
  color: var(--mist);
}

.header-cta { flex: 0 0 auto; }

/* 导航层 */
.header-nav {
  background: var(--arena-800);
  border-bottom: 1px solid var(--line);
}

.header-nav__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: calc(var(--wrap) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: 58px;
}

.primary-nav { display: block; }

.primary-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .15rem;
}

.primary-nav__item { display: block; }

.primary-nav__link {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .55rem .9rem;
  font-size: .94rem;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: color .2s var(--ease), background-color .2s var(--ease),
    border-color .2s var(--ease);
}

.primary-nav__link::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--line);
  transform: rotate(45deg);
  transition: background-color .2s var(--ease), box-shadow .2s var(--ease);
}

.primary-nav__link:hover {
  color: var(--paper);
  background: rgba(53, 242, 208, .07);
}

.primary-nav__link:hover::before { background: var(--cyan-500); }

.primary-nav__link[aria-current="page"] {
  color: var(--cyan-200);
  background: rgba(53, 242, 208, .09);
  border-color: var(--line);
}

.primary-nav__link[aria-current="page"]::before {
  background: var(--orange-600);
  box-shadow: 0 0 10px rgba(255, 90, 31, .9);
}

/* 移动端开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .6rem;
  margin-left: auto;
  padding: .55rem .8rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--paper);
  cursor: pointer;
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.nav-toggle:hover {
  border-color: rgba(53, 242, 208, .55);
  background: rgba(53, 242, 208, .07);
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
  flex: 0 0 auto;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: var(--cyan-500);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(6px) 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(-6px) rotate(-45deg);
}

/* 滚动脉冲 */
.scroll-pulse {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
  background: rgba(36, 72, 102, .55);
  --progress: 0;
}

.scroll-pulse__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform-origin: left center;
  transform: scaleX(var(--progress));
  background: linear-gradient(90deg, var(--cyan-500), var(--orange-600));
  box-shadow: 0 0 10px rgba(53, 242, 208, .65);
}

/* ---------- 7. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: auto;
  background: linear-gradient(180deg, var(--arena-900) 0%, #040C16 100%);
  border-top: 1px solid var(--line);
  color: var(--mist);
}

.footer-pulse {
  height: 2px;
  background: repeating-linear-gradient(90deg,
    var(--cyan-500) 0 22px,
    transparent 22px 36px);
  opacity: .5;
}

.site-footer__inner {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  max-width: calc(var(--wrap) + var(--gutter) * 2);
  margin-inline: auto;
  padding: clamp(2.5rem, 6vw, 4.25rem) var(--gutter) 1.5rem;
}

.footer-top {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  grid-template-columns: minmax(250px, 1fr) minmax(0, 1.7fr);
  align-items: start;
  padding-bottom: clamp(1.5rem, 3vw, 2.25rem);
  border-bottom: 1px solid rgba(36, 72, 102, .65);
}

.footer-brand__mark {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(1.75rem, 3.2vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: .06em;
  color: var(--paper);
}

.footer-brand__mark span {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: .6em;
  letter-spacing: .08em;
  color: var(--cyan-500);
  margin-left: .22em;
}

.footer-brand__statement {
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .18em;
  line-height: 1.7;
  color: var(--cyan-200);
}

.footer-brand__note {
  margin-top: .9rem;
  max-width: 34ch;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--mist);
}

.footer-brand__link {
  display: inline-block;
  margin-top: 1rem;
  padding-bottom: 2px;
  font-size: .88rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--orange-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 138, 61, .45);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.footer-brand__link:hover {
  color: var(--paper);
  border-bottom-color: var(--cyan-500);
}

.footer-nav {
  display: grid;
  gap: 1.6rem 2rem;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.footer-nav__title {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin-bottom: .9rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .22em;
  line-height: 1.4;
  color: var(--cyan-200);
}

.footer-nav__title::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: rgba(36, 72, 102, .9);
}

.footer-nav__list {
  display: grid;
  gap: .3rem;
}

.footer-nav__link {
  display: inline-block;
  padding: .22rem 0;
  font-size: .92rem;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.footer-nav__link:hover {
  color: var(--cyan-200);
  border-bottom-color: var(--cyan-500);
}

.footer-contact {
  display: grid;
  gap: 1rem;
  padding-bottom: clamp(1.5rem, 3vw, 2.25rem);
  border-bottom: 1px solid rgba(36, 72, 102, .65);
}

.footer-contact__list {
  display: grid;
  gap: .6rem 2rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.footer-contact__row {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  font-size: .9rem;
}

.footer-contact__row--wide { grid-column: 1 / -1; }

.footer-contact__row dt {
  flex: 0 0 auto;
  padding-right: .75rem;
  border-right: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--mist);
  opacity: .85;
}

.footer-contact__row dd {
  color: var(--paper);
  line-height: 1.7;
  word-break: break-word;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .7rem 1.5rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--mist);
}

.footer-legal__icp { color: var(--mist); opacity: .85; }

.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.25rem;
}

.footer-legal__link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.footer-legal__link:hover {
  color: var(--cyan-200);
  border-bottom-color: var(--cyan-500);
}

/* ---------- 8. Page scaffolding for inner pages ---------- */
.page-shell {
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  align-items: start;
  gap: clamp(1.5rem, 3vw, 3rem);
  width: 100%;
  max-width: calc(var(--wrap) + var(--rail-w) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.rail {
  position: sticky;
  top: 9rem;
  display: grid;
  gap: 1.1rem;
  align-content: start;
  padding: 1.25rem 0;
  border-right: 1px solid rgba(36, 72, 102, .65);
}

.rail__label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: .34em;
  font-family: var(--font-mono);
  font-size: .66rem;
  font-weight: 700;
  color: var(--cyan-200);
}

.rail__list { display: grid; gap: .15rem; }

.rail__link {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding-block: .32rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--mist);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.rail__link::before {
  content: "";
  width: 8px;
  height: 1px;
  flex: 0 0 auto;
  background: var(--line);
  transition: width .2s var(--ease), background-color .2s var(--ease);
}

.rail__link:hover { color: var(--cyan-200); }

.rail__link:hover::before {
  width: 18px;
  background: var(--cyan-500);
}

.rail__link[aria-current],
.rail__link[aria-current="true"] { color: var(--orange-400); }

.rail__link[aria-current]::before,
.rail__link[aria-current="true"]::before {
  width: 18px;
  background: var(--orange-600);
}

/* breadcrumb */
.breadcrumb { padding-block: 1.25rem 0; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--mist);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--line);
}

.breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.breadcrumb__link:hover {
  color: var(--cyan-200);
  border-bottom-color: var(--cyan-500);
}

/* prose */
.prose {
  max-width: 72ch;
  font-size: 1.02rem;
  line-height: 1.78;
  color: var(--mist);
}

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

.prose h2 {
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  color: var(--paper);
  margin-top: 1.8em;
}

.prose h3 {
  font-size: 1.14rem;
  color: var(--cyan-200);
  margin-top: 1.5em;
}

.prose strong { color: var(--paper); font-weight: 700; }

.prose a {
  color: var(--cyan-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, .4);
}

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

.prose ul, .prose ol { padding-left: 1.25rem; }

.prose ul li { list-style: none; position: relative; padding-left: 1rem; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 5px;
  height: 5px;
  background: var(--orange-600);
  transform: rotate(45deg);
}

.prose ol { list-style: decimal; }

.prose blockquote {
  padding: .9rem 1.2rem;
  border-left: 2px solid var(--cyan-500);
  background: rgba(23, 51, 79, .5);
  color: var(--paper);
}

/* grid & card */
.grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 2rem);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.card {
  position: relative;
  padding: clamp(1.1rem, 2.5vw, 1.75rem);
  background: linear-gradient(180deg, rgba(23, 51, 79, .55), rgba(12, 33, 56, .88));
  border: 1px solid var(--line);
  border-radius: 2px;
  transition: border-color .22s var(--ease), transform .22s var(--ease),
    box-shadow .22s var(--ease);
}

.card:hover {
  border-color: rgba(53, 242, 208, .5);
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(0, 0, 0, .35);
}

/* media frame —— 页面阶段放置图片的容器 */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: 2px;
  background:
    linear-gradient(135deg, rgba(53, 242, 208, .13), rgba(255, 90, 31, .10) 58%, rgba(12, 33, 56, .92)),
    var(--arena-700);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .55;
  background-image:
    linear-gradient(rgba(53, 242, 208, .1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(53, 242, 208, .1) 1px, transparent 1px);
  background-size: 34px 34px;
}

.media-frame--filled::after { display: none; }

.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

/* ---------- 9. Responsive ---------- */
@media (max-width: 1100px) {
  .header-rail__context { display: none; }
  .header-cta { margin-left: auto; }
}

@media (max-width: 1023px) {
  .page-shell { grid-template-columns: minmax(0, 1fr); }
  .rail {
    position: static;
    grid-auto-flow: column;
    justify-content: start;
    align-items: center;
    gap: .9rem;
    padding: .85rem 0;
    border-right: 0;
    border-bottom: 1px solid rgba(36, 72, 102, .65);
  }
  .rail__label {
    writing-mode: horizontal-tb;
    letter-spacing: .22em;
  }
  .rail__list { grid-auto-flow: column; gap: .9rem; }
}

@media (max-width: 900px) {
  .header-nav { position: relative; }

  .nav-toggle { display: inline-flex; }

  .primary-nav {
    display: none;
    position: absolute;
    inset: 100% 0 auto 0;
    z-index: 40;
    padding: .75rem var(--gutter) 1.15rem;
    background: var(--arena-800);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 48px rgba(0, 0, 0, .55);
  }

  .primary-nav[data-open] {
    display: block;
    animation: nav-drop .22s var(--ease);
  }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: .1rem;
  }

  .primary-nav__link {
    width: 100%;
    padding: .85rem .6rem;
    border-bottom: 1px solid rgba(36, 72, 102, .5);
    border-radius: 0;
    font-size: 1rem;
  }

  .primary-nav__link[aria-current="page"] { border-radius: 2px; }

  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-brand__note { max-width: none; }
}

@keyframes nav-drop {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 640px) {
  body { font-size: .97rem; }
  .brand__mark { width: 38px; height: 38px; }
  .brand__name { font-size: 1.15rem; }
  .brand__line { font-size: .66rem; letter-spacing: .2em; }
  .header-rail__inner { padding-block: .9rem; gap: .75rem 1rem; }
  .header-cta { padding: .6rem 1.1rem; font-size: .84rem; }
  .footer-legal { justify-content: flex-start; }
  .footer-contact__row { flex-direction: column; gap: .15rem; }
  .footer-contact__row dt {
    border-right: 0;
    padding-right: 0;
  }
}

/* ---------- 10. Motion preferences ---------- */
@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;
  }

  .brand__mark::before { animation: none; }
  .card:hover { transform: none; }
  .btn--signal:hover { transform: none; }
}