/* ==========================================================================
   NG赛场 · /assets/site.css
   共享外壳样式：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ========================================================================== */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, figcaption, blockquote, dl, dd {
  margin: 0;
}

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

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

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

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

summary { cursor: pointer; }

/* ---------- 变量 ---------- */
:root {
  /* 色彩 */
  --night-ink: #0E0F0C;
  --concrete-900: #1D1F1B;
  --concrete-700: #3C3F38;
  --concrete-500: #5F635B;
  --concrete-300: #C2C4BB;
  --concrete-100: #E9E9E2;
  --stand-white: #FAF9F4;
  --lemon: #C6F24E;
  --ember: #E8451A;
  --turf: #1E3A2A;

  /* 字体 */
  --font-display: 'Archivo Narrow', 'Oswald', 'PingFang SC', 'Hiragino Sans GB',
                  'Source Han Sans SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB',
               'Microsoft YaHei', 'Source Han Sans SC', system-ui, sans-serif;
  --font-mono: ui-monospace, 'SFMono-Regular', 'JetBrains Mono', 'Roboto Mono',
               Consolas, 'Courier New', monospace;

  /* 尺度 */
  --maxw: 1440px;
  --gutter: clamp(20px, 7vw, 96px);
  --gap: 24px;
  --cut: 32px;
  --header-space: clamp(84px, 9vw, 104px);

  /* 动效 */
  --ease: cubic-bezier(.4, 0, .2, 1);
}

/* ---------- 基础排版 ---------- */
body {
  margin: 0;
  padding-block-start: var(--header-space);
  background-color: var(--stand-white);
  color: var(--night-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#main-content { display: block; scroll-margin-block-start: var(--header-space); }

::selection { background-color: var(--lemon); color: var(--night-ink); }

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

.display {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 88%;
  font-size: clamp(2.6rem, 7vw, 6rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--night-ink);
}

.h-section {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 88%;
  font-size: clamp(1.6rem, 3.2vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--night-ink);
}

.prose {
  max-width: 38em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--concrete-700);
}

.prose p + p { margin-block-start: 1.1em; }
.prose h3 { margin-block: 1.6em .6em; font-size: 1.05rem; color: var(--night-ink); }
.prose a { color: var(--night-ink); border-block-end: 1px solid var(--lemon); }
.prose a:hover { color: var(--ember); border-block-end-color: var(--ember); }

.num,
.idx,
.section-num,
.stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.idx {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--concrete-500);
}

/* ---------- 布局工具 ---------- */
.wrap {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(56px, 9vw, 120px); }
.section--tight { padding-block: clamp(36px, 5vw, 64px); }
.section--ink { background-color: var(--night-ink); color: var(--stand-white); }
.section--concrete { background-color: var(--concrete-100); }
.section--ink .display,
.section--ink .h-section { color: var(--stand-white); }
.section--ink .prose { color: var(--concrete-300); }
.section--ink .idx { color: var(--concrete-300); }

.grid { display: grid; gap: var(--gap); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

.section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: end;
  gap: 16px;
  margin-block-end: clamp(28px, 4vw, 52px);
}

.section-num {
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--concrete-300);
}

@media (min-width: 900px) {
  .shift-l { margin-inline-start: clamp(12px, 4vw, 64px); }
  .shift-r { margin-inline-end: clamp(12px, 4vw, 64px); }
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  inset-inline-start: 50%;
  inset-block-start: 0;
  z-index: 200;
  transform: translate(-50%, -140%);
  padding: 12px 22px;
  background-color: var(--night-ink);
  color: var(--stand-white);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  border-radius: 0 0 12px 12px;
  transition: transform .18s var(--ease);
}

.skip-link:focus {
  transform: translate(-50%, 0);
  outline: 2px solid var(--lemon);
  outline-offset: 2px;
}

/* ---------- 头部：悬浮胶囊导航 ---------- */
.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 80;
  padding: clamp(10px, 1.6vw, 18px) clamp(12px, 2.4vw, 32px);
  pointer-events: none;
}

.header-bar {
  position: relative;
  pointer-events: auto;
  max-width: var(--maxw);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 9px 12px 9px 14px;
  border: 1px solid var(--concrete-300);
  border-radius: 999px;
  background-color: rgba(250, 249, 244, .88);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  backdrop-filter: blur(14px) saturate(1.2);
  transition: padding .22s var(--ease), box-shadow .22s var(--ease),
              border-color .22s var(--ease);
}

.site-header[data-scrolled] .header-bar {
  padding-block: 6px;
  border-color: var(--concrete-300);
  box-shadow: 0 12px 34px rgba(14, 15, 12, .10);
}

/* 品牌标记 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-chip {
  display: grid;
  place-items: center;
  inline-size: 38px;
  block-size: 38px;
  background-color: var(--night-ink);
  color: var(--lemon);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  clip-path: polygon(0 0, 100% 0, 100% 66%, 66% 100%, 0 100%);
  transition: background-color .18s var(--ease), color .18s var(--ease);
}

.brand:hover .brand-chip { background-color: var(--ember); color: var(--stand-white); }

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  overflow: hidden;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 88%;
  font-size: 17px;
  letter-spacing: .04em;
  color: var(--night-ink);
  white-space: nowrap;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .18em;
  color: var(--concrete-500);
  white-space: nowrap;
  transition: opacity .2s var(--ease);
}

.site-header[data-scrolled] .brand-sub { opacity: 0; }

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-inline-start: auto;
  padding: 9px 15px;
  border: 1px solid var(--concrete-300);
  border-radius: 999px;
  background-color: var(--stand-white);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--night-ink);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

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

.nav-toggle-bars {
  position: relative;
  inline-size: 16px;
  block-size: 10px;
  flex-shrink: 0;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  block-size: 1.5px;
  background-color: currentColor;
  transition: transform .18s var(--ease), inset-block-start .18s var(--ease),
              inset-block-end .18s var(--ease);
}

.nav-toggle-bars::before { inset-block-start: 0; }
.nav-toggle-bars::after { inset-block-end: 0; }

.nav-toggle[aria-expanded="true"] { border-color: var(--ember); color: var(--ember); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before {
  inset-block-start: 4px;
  transform: rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after {
  inset-block-end: 4.5px;
  transform: rotate(-45deg);
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-inline-start: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--concrete-700);
  white-space: nowrap;
  transition: color .18s var(--ease), border-color .18s var(--ease),
              background-color .18s var(--ease);
}

.nav-dot {
  inline-size: 5px;
  block-size: 5px;
  border-radius: 50%;
  background-color: var(--concrete-300);
  flex-shrink: 0;
  transition: background-color .18s var(--ease), box-shadow .18s var(--ease);
}

.nav-link:hover {
  color: var(--night-ink);
  border-color: var(--concrete-300);
  background-color: var(--stand-white);
}

.nav-link:hover .nav-dot { background-color: var(--ember); }

.nav-link[aria-current="page"] {
  color: var(--night-ink);
  border-color: var(--lemon);
  background-color: rgba(198, 242, 78, .18);
}

.nav-link[aria-current="page"] .nav-dot {
  background-color: var(--lemon);
  box-shadow: 0 0 0 3px rgba(198, 242, 78, .32);
}

.nav-cta {
  margin-inline-start: 8px;
  padding: 11px 18px;
  background-color: var(--night-ink);
  color: var(--stand-white);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  white-space: nowrap;
  clip-path: polygon(0 0, 100% 0, 100% 62%, 82% 100%, 0 100%);
  transition: background-color .18s var(--ease), color .18s var(--ease);
}

.nav-cta:hover { background-color: var(--lemon); color: var(--night-ink); }

.nav-cta:focus-visible {
  background-color: var(--lemon);
  color: var(--night-ink);
  outline: none;
  box-shadow: inset 0 0 0 3px var(--night-ink);
}

/* 滚动进度灯带 */
.scroll-progress {
  position: absolute;
  inset-block-start: 0;
  inset-inline: 0;
  block-size: 2px;
  background-color: transparent;
  pointer-events: none;
}

.scroll-progress-fill {
  display: block;
  inline-size: 0;
  block-size: 100%;
  background-image: linear-gradient(90deg, var(--lemon), var(--ember));
  transition: inline-size .12s linear;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-block-start: clamp(48px, 8vw, 96px);
  background-color: var(--night-ink);
  color: var(--stand-white);
}

.footer-trace {
  block-size: 3px;
  background-image: linear-gradient(90deg,
    var(--lemon) 0 96px,
    var(--ember) 96px 148px,
    var(--concrete-700) 148px 100%);
}

.footer-main { padding-block: clamp(40px, 6vw, 76px); }

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: clamp(28px, 4vw, 52px);
}

.footer-brand { display: flex; flex-direction: column; align-items: flex-start; }

.brand--footer .brand-chip { background-color: var(--lemon); color: var(--night-ink); }
.brand--footer:hover .brand-chip { background-color: var(--ember); color: var(--stand-white); }
.brand--footer .brand-name { color: var(--stand-white); }
.brand--footer .brand-sub { color: var(--concrete-300); }

.footer-note {
  margin-block-start: 18px;
  max-width: 34ch;
  font-size: 13px;
  line-height: 1.75;
  color: var(--concrete-300);
}

.footer-note--small { margin-block-start: 16px; max-width: 32ch; font-size: 12px; }

.footer-meta {
  margin-block-start: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--concrete-300);
}

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

.footer-title {
  display: flex;
  align-items: center;
  margin-block-end: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--concrete-300);
}

.footer-title::before {
  content: "";
  display: inline-block;
  inline-size: 14px;
  block-size: 1px;
  margin-inline-end: 8px;
  background-color: var(--lemon);
}

.footer-list { display: flex; flex-direction: column; gap: 11px; }

.footer-list a {
  position: relative;
  display: inline-block;
  padding-block-end: 2px;
  font-size: 14px;
  color: var(--stand-white);
  transition: color .18s var(--ease);
}

.footer-list a::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  block-size: 1px;
  background-color: var(--lemon);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--ease);
}

.footer-list a:hover { color: var(--lemon); }
.footer-list a:hover::after { transform: scaleX(1); }
.footer-list a:focus-visible { outline: 2px solid var(--lemon); outline-offset: 3px; }

.footer-contact { display: flex; flex-direction: column; gap: 14px; }
.footer-contact li { display: flex; flex-direction: column; gap: 3px; }

.footer-key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  color: var(--concrete-300);
}

.footer-val {
  font-size: 14px;
  line-height: 1.6;
  color: var(--stand-white);
  overflow-wrap: anywhere;
}

.footer-val--num { font-family: var(--font-mono); letter-spacing: .04em; }

.footer-base {
  border-block-start: 1px solid var(--concrete-700);
  padding-block: 20px;
}

.footer-base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--concrete-300);
}

.footer-legal { display: flex; flex-wrap: wrap; gap: 20px; }

.footer-legal a {
  font-size: 13px;
  color: var(--concrete-300);
  border-block-end: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.footer-legal a:hover {
  color: var(--lemon);
  border-block-end-color: var(--lemon);
}

/* ---------- 通用组件 ---------- */
/* 面板 */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 36px);
  background-color: var(--stand-white);
  border: 1px solid var(--concrete-300);
  transition: transform .16s var(--ease), border-color .16s var(--ease);
}

.panel:hover { transform: translateY(-2px); border-color: var(--concrete-500); }

.panel--ink {
  background-color: var(--night-ink);
  border-color: var(--concrete-700);
  color: var(--stand-white);
}

.panel--concrete {
  background-color: var(--concrete-100);
  border-color: var(--concrete-300);
}

.panel--cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

/* 框景 */
.frame {
  position: relative;
  padding: clamp(20px, 3.4vw, 44px);
  border: 1px solid var(--concrete-300);
  --tick-color: var(--concrete-500);
}

.frame::after {
  content: "";
  position: absolute;
  inset: -1px;
  pointer-events: none;
  --tk: var(--tick-color);
  background-image:
    linear-gradient(var(--tk), var(--tk)),
    linear-gradient(var(--tk), var(--tk)),
    linear-gradient(var(--tk), var(--tk)),
    linear-gradient(var(--tk), var(--tk)),
    linear-gradient(var(--tk), var(--tk)),
    linear-gradient(var(--tk), var(--tk)),
    linear-gradient(var(--tk), var(--tk)),
    linear-gradient(var(--tk), var(--tk));
  background-repeat: no-repeat;
  background-size:
    16px 1px, 1px 16px,
    16px 1px, 1px 16px,
    16px 1px, 1px 16px,
    16px 1px, 1px 16px;
  background-position:
    left top, left top,
    right top, right top,
    left bottom, left bottom,
    right bottom, right bottom;
}

.frame--ink { border-color: var(--concrete-700); --tick-color: var(--lemon); }

/* 展览说明牌 */
.placard {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-inline-start: 14px;
  border-inline-start: 2px solid var(--lemon);
}

.placard-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--concrete-500);
}

.placard-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--night-ink);
}

.placard-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--concrete-700);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--concrete-300);
  border-radius: 999px;
  background-color: var(--stand-white);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--concrete-700);
}

.tag--live {
  border-color: var(--lemon);
  background-color: rgba(198, 242, 78, .2);
  color: var(--night-ink);
  font-weight: 700;
}

.tag--ember {
  border-color: var(--ember);
  color: var(--ember);
  font-weight: 700;
}

.tag--turf {
  border-color: var(--turf);
  background-color: var(--turf);
  color: var(--stand-white);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 24px;
  border: 1px solid var(--night-ink);
  background-color: var(--night-ink);
  color: var(--stand-white);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  transition: background-color .18s var(--ease), color .18s var(--ease),
              border-color .18s var(--ease);
}

.btn .arrow { transition: transform .18s var(--ease); }
.btn:hover { background-color: var(--lemon); border-color: var(--lemon); color: var(--night-ink); }
.btn:hover .arrow { transform: translateX(4px); }

.btn--ghost {
  background-color: transparent;
  color: var(--night-ink);
  border-color: var(--concrete-300);
}

.btn--ghost:hover { background-color: transparent; border-color: var(--ember); color: var(--ember); }

.btn--cut { clip-path: polygon(0 0, 100% 0, 100% 64%, 88% 100%, 0 100%); }

.btn--cut:focus-visible,
.btn:focus-visible { outline: 2px solid var(--ember); outline-offset: 3px; }

/* 面包屑 */
.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--concrete-500);
}

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

.breadcrumbs li + li::before {
  content: "/";
  margin-inline-end: 8px;
  color: var(--concrete-300);
}

.breadcrumbs a { color: var(--concrete-700); transition: color .18s var(--ease); }
.breadcrumbs a:hover { color: var(--ember); }

/* 记分牌数据块 */
.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-block: 16px;
  border-block-start: 1px solid var(--concrete-300);
}

.stat-value {
  font-size: clamp(1.4rem, 2.6vw, 2.2rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--night-ink);
}

.stat-label {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--concrete-500);
}

/* 折叠组件 */
.disclosure { border-block-start: 1px solid var(--concrete-300); }
.disclosure:last-of-type { border-block-end: 1px solid var(--concrete-300); }

.disclosure > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--night-ink);
  list-style: none;
  transition: color .18s var(--ease);
}

.disclosure > summary::-webkit-details-marker { display: none; }

.disclosure > summary::after {
  content: "+";
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--concrete-500);
  transition: color .18s var(--ease), transform .18s var(--ease);
}

.disclosure > summary:hover { color: var(--ember); }
.disclosure > summary:hover::after { color: var(--ember); }

.disclosure[open] > summary::after {
  content: "−";
  color: var(--ember);
  transform: rotate(180deg);
}

.disclosure-body {
  padding: 0 4px 24px;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--concrete-700);
}

/* 图片容器（页面阶段放置 <img>） */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--concrete-300);
  background-color: var(--concrete-900);
  background-image: linear-gradient(135deg,
    var(--concrete-900) 0 44%,
    var(--concrete-700) 44% 45%,
    var(--concrete-900) 45% 100%);
}

.media > img,
.media > video {
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
}

.media figcaption {
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  padding: 12px 14px;
  background-color: rgba(14, 15, 12, .82);
  color: var(--stand-white);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .site-nav {
    position: absolute;
    inset-inline: 0;
    inset-block-start: calc(100% + 10px);
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-inline-start: 0;
    padding: 14px;
    border: 1px solid var(--concrete-300);
    border-radius: 24px;
    background-color: var(--stand-white);
    box-shadow: 0 24px 48px rgba(14, 15, 12, .16);
  }

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

  .nav-list { flex-direction: column; align-items: stretch; gap: 4px; }

  .nav-link {
    justify-content: flex-start;
    padding: 12px 14px;
    border-radius: 14px;
    font-size: 15px;
  }

  .nav-cta {
    display: flex;
    justify-content: center;
    margin: 6px 0 0;
    padding: 14px 18px;
    clip-path: none;
    border-radius: 14px;
  }

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

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

  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-7, .span-8, .span-9, .span-5 { grid-column: span 6; }
  .span-3, .span-4 { grid-column: span 3; }
}

@media (max-width: 640px) {
  :root { --gap: 16px; }

  body { line-height: 1.7; }

  .brand-sub { display: none; }

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

  .footer-base-inner { flex-direction: column; align-items: flex-start; }

  .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .span-3, .span-4, .span-5, .span-6,
  .span-7, .span-8, .span-9, .span-12 { grid-column: span 1; }

  .section-head { grid-template-columns: minmax(0, 1fr); gap: 8px; }

  .media--wide { aspect-ratio: 16 / 10; }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }

  .panel:hover { transform: none; }
  .btn:hover .arrow { transform: none; }
}