/* =============================================================
   stadium-sanyi.com.cn — Site Kit 共享样式
   /assets/site.css
   ============================================================= */

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 150px;
}

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote,
ul, ol, 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; }

a { color: var(--pitch-400); }

::selection {
  background: var(--lime-300);
  color: #05131a;
}

/* ---------- 变量 ---------- */
:root {
  color-scheme: dark;

  --night-900: #05131a;
  --night-800: #0a1e28;
  --pitch-900: #073d2a;
  --pitch-600: #0f7a50;
  --pitch-400: #1dbb7a;
  --lime-300: #c9ff4a;
  --orange-500: #ff6a3d;
  --ice-050: #eaf7f3;
  --slate-300: #9bb3ad;
  --glass-white: rgba(255, 255, 255, 0.10);
  --line-700: #1b3a42;

  --font-display: "Barlow Condensed", "Helvetica Neue Condensed", "Arial Narrow",
    "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei",
    system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular,
    Menlo, Consolas, "Courier New", monospace;

  --wrap: 1220px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius-s: 4px;
  --radius-m: 6px;
  --radius-pill: 999px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 基础中文排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  color: var(--ice-050);
  background-color: var(--night-900);
  background-image:
    radial-gradient(1100px 540px at 50% -10%, rgba(15, 122, 80, 0.30), transparent 68%),
    linear-gradient(rgba(234, 247, 243, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(234, 247, 243, 0.022) 1px, transparent 1px);
  background-size: auto, 72px 72px, 72px 72px;
  background-position: 50% 0, 0 0, 0 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main { display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--ice-050);
}

p { max-width: 68ch; }

strong { color: var(--lime-300); font-weight: 700; }

/* ---------- 无障碍 ---------- */
.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;
}

:where(a, button, [tabindex], summary):focus-visible {
  outline: 2px solid var(--lime-300);
  outline-offset: 3px;
  border-radius: 3px;
}

.skip-link {
  position: absolute;
  left: 14px;
  top: -120px;
  z-index: 300;
  padding: 11px 20px;
  border-radius: var(--radius-pill);
  background: var(--lime-300);
  color: #05131a;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-decoration: none;
  transition: top 0.18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible { top: 14px; }

/* ---------- 容器与栅格 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 26px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.prose {
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: #cfe3dd;
}

.prose p + p,
.prose ul + p { margin-top: 1em; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.btn:active { transform: translateY(1px); }

.btn--sm { padding: 9px 16px; font-size: 12px; }

.btn--primary {
  background: var(--pitch-400);
  color: #04150d;
}

.btn--primary:hover { background: var(--lime-300); }

.btn--lime {
  background: var(--lime-300);
  color: #08160c;
}

.btn--lime:hover { background: #ddff87; }

.btn--ghost {
  background: transparent;
  border-color: var(--line-700);
  color: var(--ice-050);
}

.btn--ghost:hover {
  border-color: var(--pitch-400);
  color: var(--lime-300);
}

.btn--accent {
  background: var(--orange-500);
  color: #1a0a05;
}

.btn--accent:hover { background: #ff8a67; }

/* ---------- 胶囊标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border: 1px solid var(--line-700);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.03);
  color: var(--slate-300);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  line-height: 1.7;
  white-space: nowrap;
}

.tag--lime {
  color: var(--lime-300);
  border-color: rgba(201, 255, 74, 0.35);
  background: rgba(201, 255, 74, 0.08);
}

.tag--pitch {
  color: var(--pitch-400);
  border-color: rgba(29, 187, 122, 0.32);
  background: rgba(29, 187, 122, 0.10);
}

.tag--accent {
  color: var(--orange-500);
  border-color: rgba(255, 106, 61, 0.38);
  background: rgba(255, 106, 61, 0.10);
}

/* ---------- 面板与数字 ---------- */
.panel {
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-m);
  background: var(--night-800);
}

.panel--glass {
  background: var(--glass-white);
  border-color: rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.panel--pitch {
  background: linear-gradient(160deg, rgba(15, 122, 80, 0.30), rgba(5, 19, 26, 0.94));
  border-color: rgba(29, 187, 122, 0.24);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat__value {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(38px, 6vw, 72px);
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--lime-300);
}

.stat__unit {
  margin-left: 0.12em;
  font-size: 0.42em;
  letter-spacing: 0.04em;
  color: var(--slate-300);
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate-300);
}

/* ---------- 章节头与旁注 ---------- */
.page-section {
  padding-block: clamp(36px, 5vw, 64px);
  border-top: 1px solid var(--line-700);
}

.page-section:first-child { border-top: 0; }

.section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2vw, 28px);
  align-items: start;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.section-head__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--pitch-400);
  font-variant-numeric: tabular-nums;
}

.section-head__body {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.section-head__title {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.25;
}

.section-head__note {
  font-size: 14px;
  line-height: 1.85;
  color: var(--slate-300);
  max-width: 62ch;
}

.rail-note {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  line-height: 1.5;
  color: var(--slate-300);
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

/* ---------- 图片容器基础 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-700);
  border-radius: var(--radius-m);
  background: linear-gradient(140deg, #0a1e28 0%, #073d2a 58%, #05131a 100%);
  aspect-ratio: 16 / 9;
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.45;
  background-image:
    linear-gradient(rgba(234, 247, 243, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(234, 247, 243, 0.07) 1px, transparent 1px);
  background-size: 44px 44px;
  mix-blend-mode: screen;
}

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

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding-block: 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate-300);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--line-700);
}

.breadcrumb__link {
  color: var(--slate-300);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.breadcrumb__link:hover { color: var(--lime-300); }

.breadcrumb__current { color: var(--ice-050); }

/* =============================================================
   HEADER
   ============================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: linear-gradient(180deg, rgba(5, 19, 26, 0.99) 0%, rgba(5, 19, 26, 0.93) 100%);
  border-bottom: 1px solid var(--line-700);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

/* 快讯条 */
.header-ticker {
  overflow: hidden;
  max-height: 46px;
  background: linear-gradient(90deg, var(--pitch-900), rgba(7, 61, 42, 0.55) 62%, rgba(5, 19, 26, 0.9));
  border-bottom: 1px solid rgba(201, 255, 74, 0.14);
  transition: max-height 0.32s var(--ease), opacity 0.24s var(--ease),
    border-color 0.24s var(--ease);
}

.ticker-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 36px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate-300);
}

.ticker-dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime-300);
  animation: kit-pulse 2.8s var(--ease) infinite;
}

.ticker-text {
  color: var(--ice-050);
  letter-spacing: 0.14em;
}

.ticker-spacer { flex: 1 1 auto; }

.ticker-meta {
  color: var(--lime-300);
  letter-spacing: 0.14em;
}

@keyframes kit-pulse {
  0% { box-shadow: 0 0 0 0 rgba(201, 255, 74, 0.55); }
  70% { box-shadow: 0 0 0 9px rgba(201, 255, 74, 0); }
  100% { box-shadow: 0 0 0 0 rgba(201, 255, 74, 0); }
}

/* 刊头 */
.masthead {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  padding-block: clamp(16px, 2.4vw, 26px);
  border-bottom: 1px solid var(--line-700);
}

.masthead__brand {
  justify-self: center;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.masthead__mark {
  position: relative;
  flex: none;
  width: 28px;
  height: 28px;
  border: 2px solid var(--pitch-400);
  border-radius: 5px;
  background: linear-gradient(135deg, rgba(29, 187, 122, 0.40), transparent 62%);
  transition: border-color 0.2s var(--ease);
}

.masthead__mark::after {
  content: "";
  position: absolute;
  inset: 6px;
  background: var(--lime-300);
  clip-path: polygon(0 0, 100% 0, 100% 42%, 42% 42%, 42% 100%, 0 100%);
}

.masthead__brand:hover .masthead__mark { border-color: var(--lime-300); }

.masthead__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  gap: 4px;
}

.masthead__name {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--ice-050);
  transition: color 0.2s var(--ease);
}

.masthead__brand:hover .masthead__name { color: var(--lime-300); }

.masthead__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--slate-300);
}

.masthead__aside {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.masthead__aside--left { justify-self: start; }
.masthead__aside--right {
  justify-self: end;
  align-items: flex-end;
}

.masthead__kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--pitch-400);
}

.masthead__kicker-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate-300);
}

/* 栏目轨道 */
.nav-bar {
  background: rgba(10, 30, 40, 0.55);
  border-bottom: 1px solid var(--line-700);
}

.nav-bar__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.site-nav { display: block; }

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.site-nav__item { display: block; }

.site-nav__link {
  display: inline-block;
  padding: 14px 15px;
  border-bottom: 2px solid transparent;
  color: var(--slate-300);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    background-color 0.2s var(--ease);
}

.site-nav__link:hover {
  color: var(--ice-050);
  border-bottom-color: var(--pitch-400);
  background: rgba(29, 187, 122, 0.07);
}

.site-nav__link[aria-current="page"] {
  color: var(--lime-300);
  border-bottom-color: var(--lime-300);
  background: rgba(201, 255, 74, 0.07);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 15px;
  border: 1px solid var(--line-700);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.04);
  color: var(--ice-050);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease),
    background-color 0.2s var(--ease);
}

.nav-toggle:hover {
  border-color: var(--pitch-400);
  background: rgba(29, 187, 122, 0.10);
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--lime-300);
  color: var(--lime-300);
  background: rgba(201, 255, 74, 0.08);
}

.nav-toggle__bars {
  position: relative;
  flex: none;
  display: block;
  width: 16px;
  height: 9px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.22s var(--ease), top 0.22s var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { top: 7px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 3.5px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 3.5px;
  transform: rotate(-45deg);
}

.nav-toggle__label { line-height: 1; }

/* 滚动进度 */
.scroll-meter {
  height: 2px;
  width: 100%;
  background: rgba(155, 179, 173, 0.12);
}

.scroll-meter__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(var(--progress, 0));
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--pitch-400), var(--lime-300));
  transition: transform 0.1s linear;
}

/* 滚动后收起快讯条 */
.site-header[data-stuck] .header-ticker {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
  pointer-events: none;
}

/* =============================================================
   FOOTER
   ============================================================= */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: clamp(56px, 8vw, 110px);
  border-top: 1px solid var(--line-700);
  background: linear-gradient(180deg, var(--pitch-900) 0%, rgba(5, 19, 26, 0.96) 72%);
  color: var(--slate-300);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -190px;
  left: 50%;
  width: 540px;
  height: 540px;
  transform: translateX(-50%);
  border: 1px solid rgba(29, 187, 122, 0.16);
  border-radius: 50%;
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(29, 187, 122, 0.14), transparent);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(44px, 6vw, 72px) 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(220px, 1.5fr) repeat(4, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 44px);
  padding-bottom: clamp(34px, 4vw, 54px);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 32ch;
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--ice-050);
  max-width: none;
}

.footer-brand__line {
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--pitch-400);
  max-width: none;
}

.footer-brand__note {
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--slate-300);
  max-width: none;
}

.footer-col { min-width: 0; }

.footer-col__title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--pitch-400);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-link {
  display: inline-block;
  padding: 6px 0;
  color: var(--slate-300);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.18s var(--ease), transform 0.18s var(--ease);
}

.footer-link:hover {
  color: var(--ice-050);
  transform: translateX(3px);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  padding-block: 22px;
  border-top: 1px solid rgba(155, 179, 173, 0.18);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  line-height: 1.9;
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  max-width: none;
  color: var(--slate-300);
}

.footer-contact__label {
  padding: 2px 10px;
  border: 1px solid rgba(29, 187, 122, 0.32);
  border-radius: var(--radius-pill);
  color: var(--pitch-400);
  font-size: 10px;
  letter-spacing: 0.2em;
}

.footer-contact__value { color: var(--ice-050); }

.footer-contact__sep { color: var(--line-700); }

.footer-legal {
  max-width: none;
  color: var(--slate-300);
}

.footer-copy {
  max-width: none;
  color: var(--slate-300);
}

/* =============================================================
   响应式
   ============================================================= */
@media (max-width: 1080px) {
  .footer-grid {
    grid-template-columns: minmax(200px, 1.4fr) repeat(2, minmax(0, 1fr));
    row-gap: 34px;
  }
  .footer-brand { grid-column: 1 / -1; max-width: 46ch; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 96px; }

  .grid--3,
  .grid--2 { grid-template-columns: minmax(0, 1fr); }

  .masthead {
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
    text-align: center;
    padding-block: 16px;
    gap: 12px;
  }

  .masthead__brand { justify-self: center; }

  .masthead__aside {
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 12px;
  }

  .masthead__aside--right { justify-self: center; align-items: center; }

  .nav-bar__inner {
    justify-content: flex-start;
    padding-block: 8px;
  }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: calc(-1 * var(--gutter));
    right: calc(-1 * var(--gutter));
    z-index: 6;
    display: none;
    background: var(--night-800);
    border-top: 1px solid var(--line-700);
    border-bottom: 1px solid var(--line-700);
    box-shadow: 0 28px 48px rgba(0, 0, 0, 0.55);
  }

  .site-nav[data-open] { display: block; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    display: block;
    padding: 15px 24px;
    border-bottom: 1px solid rgba(27, 58, 66, 0.9);
    border-left: 3px solid transparent;
  }

  .site-nav__link:hover {
    border-bottom-color: rgba(27, 58, 66, 0.9);
    border-left-color: var(--pitch-400);
  }

  .site-nav__link[aria-current="page"] {
    border-bottom-color: rgba(27, 58, 66, 0.9);
    border-left-color: var(--lime-300);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }

  .ticker-meta { display: none; }

  .masthead__aside--left { display: none; }

  .masthead__name {
    font-size: 19px;
    letter-spacing: 0.12em;
  }

  .masthead__sub { font-size: 9px; letter-spacing: 0.18em; }

  .masthead__mark { width: 24px; height: 24px; }

  .ticker-inner {
    font-size: 10px;
    letter-spacing: 0.1em;
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 20px;
  }

  .footer-brand__name { font-size: 18px; }

  .section-head { grid-template-columns: minmax(0, 1fr); }

  .rail-note { writing-mode: horizontal-tb; }

  .footer-contact { flex-direction: column; align-items: flex-start; gap: 4px; }
  .footer-contact__sep { display: none; }
}

/* =============================================================
   动效偏好
   ============================================================= */
@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;
  }

  .ticker-dot { animation: none; }
  .scroll-meter__bar { transition: none; }
}