/* ============================================================
   6T体育赛事 · 共享站点套件  /assets/site.css
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,h6,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
[id]{scroll-margin-top:136px}

/* ---------- 2. 设计变量 ---------- */
:root{
  --ink-void:#0A1220;
  --ink-raise:#101B2E;
  --steel:#1B2C48;
  --mist:#8FA3BF;
  --chalk:#F4F7FB;
  --compete:#FF6A1A;
  --warm:#FFB27A;
  --turf:#2FBF71;
  --field-light:#EEF1F6;
  --alert:#E0533C;

  --font-display:"Barlow Condensed","Oswald","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,"Cascadia Mono",Menlo,Consolas,monospace;

  --shell:1240px;
  --gutter:clamp(18px,4vw,40px);
  --radius-s:10px;
  --radius-m:16px;
  --radius-l:24px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--chalk);
  background-color:var(--ink-void);
  background-image:
    radial-gradient(1100px 560px at 82% -12%, rgba(255,106,26,.10), transparent 62%),
    radial-gradient(880px 480px at 8% 2%, rgba(47,191,113,.07), transparent 58%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3{font-family:var(--font-display);font-weight:800;line-height:1.04;letter-spacing:-.02em;color:var(--chalk)}
h4,h5,h6{font-family:var(--font-body);font-weight:700;line-height:1.35}
strong{font-weight:700;color:var(--chalk)}

:focus-visible{outline:2px solid var(--compete);outline-offset:3px;border-radius:4px}
body.is-locked{overflow:hidden}

.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}

/* ---------- 4. 通用工具 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--compete);
}
.eyebrow::before{content:"";width:18px;height:1px;background:currentColor}
.timestamp{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.08em;color:var(--mist)}
.rule{height:1px;border:0;background:var(--steel);margin:0}

.tag{
  display:inline-flex;align-items:center;gap:.55em;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--mist);
}
.tag::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor}
.tag--live{color:var(--compete)}
.tag--confirmed{color:var(--turf)}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:.82em 1.5em;border-radius:999px;border:1px solid transparent;
  font-family:var(--font-body);font-size:15px;font-weight:600;letter-spacing:.05em;
  text-decoration:none;cursor:pointer;white-space:nowrap;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.btn--primary{background:var(--compete);color:#140A03;box-shadow:0 14px 34px -18px rgba(255,106,26,.9)}
.btn--primary:hover{background:var(--warm);transform:translateY(-1px)}
.btn--ghost{border-color:var(--steel);color:var(--chalk);background:rgba(255,255,255,.02)}
.btn--ghost:hover{border-color:var(--compete);color:var(--warm)}
.btn--quiet{padding:.3em 0;color:var(--warm);border-radius:0}
.btn--quiet:hover{color:var(--chalk)}

/* ---------- 6. 面包屑 ---------- */
.breadcrumb{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--mist)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--steel)}
.breadcrumb__link{color:var(--mist);transition:color .2s var(--ease)}
.breadcrumb__link:hover{color:var(--compete)}
.breadcrumb__current{color:var(--chalk)}

/* ---------- 7. 章节与网格 ---------- */
.section{position:relative;padding-block:clamp(56px,8vw,110px)}
.section--tight{padding-block:clamp(32px,5vw,64px)}
.section--light{background:var(--field-light);color:#16233A}
.section--light h1,.section--light h2,.section--light h3{color:#0A1220}
.section__head{max-width:64ch;margin-bottom:clamp(24px,4vw,44px)}
.section__title{font-size:clamp(28px,4vw,48px)}
.section__lede{margin-top:14px;font-size:16.5px;color:var(--mist)}
.section--light .section__lede{color:#44566F}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2vw,24px)}
.span-4{grid-column:span 4}
.span-6{grid-column:span 6}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}

/* ---------- 8. 正文 ---------- */
.prose{max-width:68ch;font-size:17px;line-height:1.78;color:var(--mist)}
.prose > * + *{margin-top:1.1em}
.prose h2{font-size:clamp(24px,3vw,34px);color:var(--chalk);margin-top:1.8em}
.prose h3{font-size:clamp(19px,2.2vw,24px);color:var(--chalk);margin-top:1.5em}
.prose a{color:var(--warm);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--compete)}
.prose ul{list-style:none;padding-left:0}
.prose li{position:relative;padding-left:20px;margin-top:.5em}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:2px;background:var(--compete)}
.prose blockquote{
  border-left:2px solid var(--compete);padding-left:18px;
  font-family:var(--font-display);font-size:20px;line-height:1.5;color:var(--chalk);
}
.section--light .prose{color:#33445C}
.section--light .prose h2,.section--light .prose h3{color:#0A1220}

/* ---------- 9. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;overflow:hidden;isolation:isolate;
  border-radius:var(--radius-l);
  background:linear-gradient(135deg,var(--steel),var(--ink-raise));
}
.media-frame__media{
  display:block;width:100%;height:100%;object-fit:cover;aspect-ratio:16/10;
  filter:saturate(.92) contrast(1.04);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(10,18,32,.18) 0%,rgba(10,18,32,.55) 100%);
}
.media-frame__caption{
  position:absolute;left:18px;right:18px;bottom:14px;z-index:2;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;color:rgba(244,247,251,.82);
}
.media-frame--wide .media-frame__media{aspect-ratio:21/9}
.media-frame--portrait .media-frame__media{aspect-ratio:4/5}
.media-frame--band{border-radius:0}
.media-frame--band .media-frame__media{aspect-ratio:3/1}
.media-frame--empty .media-frame__media{
  background-image:repeating-linear-gradient(135deg,rgba(143,163,191,.14) 0 2px,transparent 2px 12px);
}

/* ---------- 10. 面板 ---------- */
.panel{border:1px solid var(--steel);border-radius:var(--radius-m);background:var(--ink-raise);padding:clamp(18px,2.4vw,26px)}
.panel__head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:8px 16px;margin-bottom:12px}
.panel__title{font-family:var(--font-display);font-size:20px;letter-spacing:.01em;color:var(--chalk)}

/* ---------- 11. 章节索引 ---------- */
.chapter-index{font-family:var(--font-mono);font-size:12px}
.chapter-index__label{display:block;margin-bottom:10px;font-size:11px;letter-spacing:.26em;text-transform:uppercase;color:rgba(143,163,191,.62)}
.chapter-index__list{display:flex;flex-direction:column;gap:2px;border-left:1px solid var(--steel)}
.chapter-index__link{
  position:relative;display:block;padding:7px 0 7px 14px;
  color:var(--mist);letter-spacing:.08em;
  transition:color .2s var(--ease);
}
.chapter-index__link::before{
  content:"";position:absolute;left:-1px;top:50%;width:2px;height:0;
  background:var(--compete);transform:translateY(-50%);
  transition:height .24s var(--ease);
}
.chapter-index__link:hover{color:var(--chalk)}
.chapter-index__link[aria-current="true"]{color:var(--chalk)}
.chapter-index__link[aria-current="true"]::before{height:68%}
.chapter-index--fixed{position:fixed;right:clamp(12px,2.2vw,28px);top:50%;transform:translateY(-50%);z-index:40;width:170px}
@media (max-width:1179px){.chapter-index--fixed{display:none}}

/* ---------- 12. 跳至主要内容 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:.7em 1.3em;border-radius:999px;
  background:var(--compete);color:#140A03;
  font-size:14px;font-weight:700;letter-spacing:.06em;
  transform:translateY(-180%);
  transition:transform .24s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:none}

/* ---------- 13. 刊头 ---------- */
.site-masthead{
  position:sticky;top:0;z-index:90;
  background:linear-gradient(180deg,rgba(10,18,32,.98),rgba(10,18,32,.91));
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--steel);
}
.masthead-strip{
  max-height:52px;overflow:hidden;
  background:var(--ink-raise);
  border-bottom:1px solid rgba(27,44,72,.9);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mist);
  transition:max-height .3s var(--ease),opacity .22s var(--ease);
}
.masthead-strip__inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:38px;padding-block:6px}
.masthead-note{display:flex;align-items:center;gap:9px;color:var(--mist)}
.masthead-note__dot{width:6px;height:6px;border-radius:50%;background:var(--turf);box-shadow:0 0 0 4px rgba(47,191,113,.16)}
.masthead-strip__actions{display:flex;align-items:center;gap:clamp(12px,2.2vw,26px)}
.strip-link{color:var(--mist);transition:color .2s var(--ease)}
.strip-link:hover{color:var(--warm)}
.strip-link--hot{color:var(--compete)}
.strip-link--hot::before{
  content:"";display:inline-block;width:5px;height:5px;margin-right:7px;
  border-radius:50%;background:currentColor;vertical-align:middle;
  animation:blip 2.4s var(--ease) infinite;
}
@keyframes blip{0%,100%{opacity:1}50%{opacity:.22}}

.masthead-core{
  position:relative;
  display:flex;flex-direction:column;align-items:center;
  padding-top:18px;padding-bottom:2px;
}
.brand-lockup{
  display:inline-flex;flex-direction:column;align-items:center;gap:5px;
  text-align:center;color:var(--chalk);
}
.brand-kicker{font-family:var(--font-mono);font-size:11px;letter-spacing:.42em;text-indent:.42em;color:var(--mist)}
.brand-name{
  display:inline-flex;align-items:baseline;gap:.16em;
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(26px,3.6vw,40px);line-height:1;letter-spacing:-.01em;
  transition:font-size .28s var(--ease);
}
.brand-name__num{color:var(--compete);font-size:1.16em;letter-spacing:-.03em}
.brand-tagline{
  max-height:24px;overflow:hidden;
  font-size:12.5px;letter-spacing:.16em;color:var(--mist);
  transition:max-height .28s var(--ease),opacity .22s var(--ease);
}

.primary-nav{width:100%;margin-top:14px;border-top:1px solid var(--steel)}
.nav-list{display:flex;flex-wrap:wrap;align-items:stretch;justify-content:center;gap:clamp(8px,2.4vw,34px)}
.nav-item{display:flex}
.nav-link{
  position:relative;display:inline-flex;align-items:center;
  padding:14px 2px 15px;
  font-size:15px;font-weight:500;letter-spacing:.06em;color:var(--mist);
  transition:color .2s var(--ease),padding .28s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:9px;height:2px;
  background:var(--compete);transform:scaleX(0);transform-origin:center;
  transition:transform .24s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--chalk)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--chalk)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden;background:rgba(27,44,72,.7);pointer-events:none}
.scroll-progress__bar{
  display:block;width:100%;height:100%;
  background:linear-gradient(90deg,var(--compete),var(--warm));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .12s linear;
}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  position:absolute;right:var(--gutter);top:16px;
  padding:9px 12px;border:1px solid var(--steel);border-radius:999px;
  background:rgba(16,27,46,.92);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--chalk);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--compete);color:var(--warm)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bars span{display:block;height:2px;border-radius:2px;background:currentColor;transition:transform .26s 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)}

/* 收缩态 */
.site-masthead[data-condensed] .masthead-strip{max-height:0;opacity:0;border-color:transparent}
.site-masthead[data-condensed] .masthead-core{padding-top:10px}
.site-masthead[data-condensed] .brand-tagline{max-height:0;opacity:0}
.site-masthead[data-condensed] .brand-name{font-size:clamp(20px,2.4vw,26px)}
.site-masthead[data-condensed] .nav-link{padding-block:10px}

/* ---------- 14. 返回顶部 ---------- */
.back-to-top{
  position:fixed;right:clamp(14px,2.4vw,28px);bottom:clamp(14px,2.4vw,28px);z-index:70;
  display:grid;place-items:center;
  width:48px;height:48px;border-radius:50%;
  background:var(--steel);border:1.5px solid var(--compete);color:var(--chalk);
  opacity:0;visibility:hidden;transform:translateY(12px);
  box-shadow:0 18px 36px -20px #000;
  transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s,border-color .2s var(--ease),color .2s var(--ease);
}
.back-to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.back-to-top:hover{border-color:var(--warm);color:var(--warm)}
.back-to-top__arrow{font-family:var(--font-mono);font-size:18px;line-height:1}

/* ---------- 15. 帮助抽屉 ---------- */
.drawer-scrim{
  position:fixed;inset:0;z-index:120;
  background:rgba(4,8,16,.7);
  -webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);
  opacity:0;visibility:hidden;
  transition:opacity .28s var(--ease),visibility .28s;
}
.drawer-scrim[data-open]{opacity:1;visibility:visible}
.help-drawer{
  position:fixed;top:0;right:0;bottom:0;z-index:130;
  display:flex;flex-direction:column;
  width:min(430px,94vw);
  background:var(--ink-raise);
  border-left:1px solid var(--steel);
  transform:translateX(102%);
  transition:transform .36s var(--ease);
}
.help-drawer[data-open]{transform:none}
.help-drawer__head{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 22px;border-bottom:1px solid var(--steel);
}
.help-drawer__title{font-family:var(--font-display);font-size:22px;letter-spacing:.01em;color:var(--chalk)}
.help-drawer__close{
  width:36px;height:36px;border-radius:50%;
  border:1px solid var(--steel);color:var(--mist);
  font-family:var(--font-mono);font-size:16px;line-height:1;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.help-drawer__close:hover{border-color:var(--compete);color:var(--warm)}
.help-drawer__body{padding:20px 22px 32px;overflow-y:auto;font-size:15px;color:var(--mist)}

/* ---------- 16. 页脚 ---------- */
.site-footer{
  position:relative;
  border-top:1px solid var(--steel);
  padding-block:clamp(48px,7vw,88px) 28px;
  background:linear-gradient(180deg,var(--ink-void) 0%,#070D18 42%,#060A13 100%);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,var(--compete),rgba(255,106,26,0) 46%);
}
.footer-top{
  display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);
  gap:clamp(28px,4vw,64px);align-items:start;
}
.footer-brand{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(30px,4.2vw,52px);line-height:1;letter-spacing:-.02em;color:var(--chalk);
}
.footer-brand__num{color:var(--compete);margin-right:.1em;letter-spacing:-.03em}
.footer-slogan{margin-top:12px;max-width:30ch;font-size:14.5px;letter-spacing:.02em;color:var(--mist)}
.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px 18px}
.footer-col__title{
  margin-bottom:12px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:500;letter-spacing:.24em;
  text-transform:uppercase;color:var(--compete);
}
.footer-col__list{display:flex;flex-direction:column;gap:9px}
.footer-link{
  position:relative;display:inline-block;
  font-size:15px;color:var(--mist);
  transition:color .2s var(--ease),transform .22s var(--ease);
}
.footer-link::before{
  content:"";position:absolute;left:-14px;top:50%;width:7px;height:1px;
  background:var(--compete);transform:scaleX(0);transform-origin:right center;
  transition:transform .22s var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:var(--chalk);transform:translateX(8px)}
.footer-link:hover::before,.footer-link:focus-visible::before{transform:scaleX(1)}

.footer-contact{
  display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);
  gap:22px 48px;
  margin-top:clamp(32px,5vw,56px);padding-top:26px;
  border-top:1px solid var(--steel);
}
.footer-contact__block{display:flex;flex-direction:column;gap:12px;align-items:flex-start}
.footer-contact__label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;text-transform:uppercase;
  color:rgba(143,163,191,.7);
}
.copy-mail{
  display:inline-flex;align-items:center;gap:10px;
  padding:8px 8px 8px 14px;border:1px solid var(--steel);border-radius:999px;
  background:rgba(27,44,72,.42);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;color:var(--chalk);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.copy-mail:hover{border-color:var(--compete);color:var(--warm)}
.copy-mail__text{white-space:nowrap}
.copy-mail__hint{
  padding:3px 9px;border-radius:999px;
  background:rgba(255,106,26,.14);
  font-size:11px;letter-spacing:.16em;color:var(--compete);
  transition:background .2s var(--ease),color .2s var(--ease);
}
.copy-mail[data-copied]{border-color:var(--turf)}
.copy-mail[data-copied] .copy-mail__hint{background:rgba(47,191,113,.16);color:var(--turf)}
.footer-contact__line{display:flex;gap:14px;align-items:baseline;font-size:14.5px;color:var(--mist)}
.footer-contact__key{
  flex:none;min-width:34px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;
  color:rgba(143,163,191,.68);
}
.footer-contact__val{color:var(--chalk)}
.footer-contact__note{max-width:64ch;font-size:13px;line-height:1.72;color:var(--mist)}
.copy-status{min-height:1.2em;font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--turf)}

.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  margin-top:32px;padding-top:18px;
  border-top:1px solid rgba(27,44,72,.8);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:rgba(143,163,191,.78);
}
.footer-legal__icp{color:var(--mist)}
.footer-note{color:rgba(143,163,191,.62)}

/* ---------- 17. 响应式 ---------- */
@media (max-width:1100px){
  .span-8,.span-6{grid-column:span 12}
  .span-4{grid-column:span 6}
  .footer-top{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
  .footer-contact{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:900px){
  body{font-size:16.5px}
  [id]{scroll-margin-top:112px}

  .masthead-core{align-items:flex-start;padding-top:14px;padding-bottom:12px}
  .brand-lockup{align-items:flex-start;text-align:left;padding-right:120px}
  .brand-tagline{display:none}
  .nav-toggle{display:inline-flex;top:14px}

  .primary-nav{
    position:absolute;left:0;right:0;top:100%;margin-top:0;
    max-height:0;overflow:hidden;opacity:0;visibility:hidden;
    border-top:1px solid var(--steel);border-bottom:1px solid var(--steel);
    background:var(--ink-raise);
    box-shadow:0 28px 44px -24px rgba(0,0,0,.85);
    transition:max-height .38s var(--ease),opacity .24s var(--ease),visibility .24s;
  }
  .primary-nav[data-open]{max-height:min(72vh,560px);overflow-y:auto;opacity:1;visibility:visible}
  .nav-list{flex-direction:column;align-items:stretch;justify-content:flex-start;gap:0;padding:6px var(--gutter) 20px}
  .nav-item{border-bottom:1px solid rgba(27,44,72,.85)}
  .nav-item:last-child{border-bottom:0}
  .nav-link{width:100%;padding:15px 0;font-size:16px}
  .nav-link::after{left:0;right:auto;width:24px;bottom:11px;transform-origin:left center}
  .nav-link:hover::after,.nav-link[aria-current="page"]::after{transform:scaleX(1)}

  .masthead-strip__inner{min-height:34px;font-size:11px;gap:10px}
  .masthead-strip__actions{gap:12px}
  .strip-link--hot::before{width:4px;height:4px;margin-right:5px}

  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-nav{grid-template-columns:repeat(3,minmax(0,1fr))}
  .section__lede{font-size:15.5px}
}

@media (max-width:640px){
  :root{--radius-l:18px}
  .brand-kicker{font-size:10px;letter-spacing:.34em;text-indent:.34em}
  .brand-name{font-size:26px}
  .nav-toggle{padding:8px 10px}
  .nav-toggle__label{display:none}

  .masthead-note{font-size:10.5px}
  .masthead-note__dot{width:5px;height:5px;box-shadow:0 0 0 3px rgba(47,191,113,.16)}

  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px 16px}
  .footer-contact__line{flex-direction:column;gap:4px}
  .copy-mail{flex-wrap:wrap;padding:10px 12px;font-size:12.5px}
  .copy-mail__text{white-space:normal;word-break:break-all}
  .footer-base{flex-direction:column;align-items:flex-start;gap:8px}
  .back-to-top{width:44px;height:44px}
  .help-drawer__head{padding:16px 18px}
  .help-drawer__body{padding:16px 18px 28px}
}

/* ---------- 18. 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .strip-link--hot::before{animation:none}
  .scroll-progress__bar{transition:none}
}