/* ============================================================
   /assets/site.css — 斗球中心 共享样式
   1 reset · 2 tokens · 3 base · 4 utilities · 5 components
   6 header · 7 footer · 8 a11y & motion
   ============================================================ */

/* ---------- 1. RESET ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){html{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,canvas{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:where(h1,h2,h3,h4,h5,h6){text-wrap:balance}

/* ---------- 2. TOKENS ---------- */
:root{
  --ink:#07231F;
  --ink-2:#0C332C;
  --blue:#1E5BFF;
  --cyan:#38F2D6;
  --orange:#FF6A2B;
  --orange-hi:#FF8149;
  --clay:#C9714B;
  --stone:#8C948C;
  --paper:#F3EFE4;
  --paper-2:#E4DCCB;
  --t-ink:#EAF7F4;
  --t-paper:#12211E;
  --muted:#5A6763;
  --line-c:rgba(18,33,30,.16);
  --line-ink:rgba(234,247,244,.18);
  --card-bg:var(--paper-2);
  --rail:96px;
  --gutter:clamp(18px,4.2vw,64px);
  --maxw:1440px;
  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Heiti SC","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 ---------- */
body{
  font-family:var(--font-sans);
  font-size:clamp(16px,0.55vw + 14.2px,18px);
  line-height:1.85;
  font-weight:400;
  color:var(--t-paper);
  background:var(--paper);
  --fg:var(--t-paper);
  --muted:#5A6763;
  --line-c:rgba(18,33,30,.16);
  --card-bg:var(--paper-2);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
@media (min-width:1024px){body{padding-left:var(--rail)}}
h1,h2,h3,h4{font-weight:900;line-height:1.1;letter-spacing:-.02em}
h1{font-size:clamp(38px,5.4vw,84px);line-height:.98}
h2{font-size:clamp(28px,3.4vw,48px)}
h3{font-size:clamp(20px,2vw,26px);letter-spacing:-.01em}
::selection{background:var(--cyan);color:var(--ink)}
body.is-locked{overflow:hidden}
main{display:block}

/* ---------- 4. UTILITIES ---------- */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.theme-ink{
  --fg:var(--t-ink);--muted:#9FBCB6;--line-c:rgba(234,247,244,.18);--card-bg:var(--ink-2);
  background:var(--ink);color:var(--t-ink);
}
.theme-paper{
  --fg:var(--t-paper);--muted:#5A6763;--line-c:rgba(18,33,30,.16);--card-bg:var(--paper-2);
  background:var(--paper);color:var(--t-paper);
}
.mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.04em}
.anno{font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.anno--vertical{writing-mode:vertical-rl;letter-spacing:.28em;text-orientation:mixed}
.link{color:var(--blue);border-bottom:1px solid currentColor;padding-bottom:1px}
.theme-ink .link{color:var(--cyan)}
.rule{border:0;height:1px;background:var(--line-c);margin:0}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 5. COMPONENTS ---------- */
/* buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 24px;border:1px solid transparent;border-radius:2px;
  font-family:var(--font-sans);font-size:15px;font-weight:800;letter-spacing:.02em;line-height:1.2;
  text-align:center;cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--primary{background:var(--orange);color:var(--ink);border-color:var(--orange)}
.btn--primary:hover{background:var(--orange-hi);border-color:var(--orange-hi)}
.btn--ghost{background:transparent;color:var(--fg);border-color:currentColor}
.btn--ghost:hover{background:rgba(56,242,214,.12);border-color:var(--cyan);color:var(--cyan)}
.btn--sm{padding:9px 14px;font-size:13px}
.btn--block{width:100%}

/* breadcrumb */
.breadcrumb{padding-top:clamp(18px,2.4vw,30px)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--stone)}
.breadcrumb__link{color:inherit}
.breadcrumb__link:hover{color:var(--blue)}
.theme-ink .breadcrumb__link:hover{color:var(--cyan)}
.breadcrumb__current{color:var(--fg);font-weight:600}

/* page head */
.page-head{position:relative;display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(14px,2vw,22px);padding:clamp(28px,4.4vw,64px) 0 clamp(24px,3.6vw,52px)}
.page-head__kicker{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted)}
.page-head__kicker::before{content:"";width:22px;height:2px;background:var(--cyan)}
.page-head__title{font-size:clamp(40px,7.2vw,104px);line-height:.94;letter-spacing:-.03em;font-weight:900;max-width:16em}
.page-head__title em{font-style:normal;color:var(--blue)}
.theme-ink .page-head__title em{color:var(--cyan)}
.page-head__lead{max-width:34em;color:var(--muted);font-size:clamp(15px,1.1vw,17px)}
.page-head__anno{position:absolute;right:0;top:clamp(28px,4vw,64px);font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;writing-mode:vertical-rl;color:var(--stone)}
@media (max-width:767px){.page-head__anno{display:none}}

/* section */
.section{padding:clamp(36px,5vw,72px) 0;position:relative}
.section + .section{border-top:1px solid var(--line-c)}
.section__head{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,4fr);gap:clamp(16px,3vw,48px);align-items:end;margin-bottom:clamp(20px,2.6vw,36px)}
.section__num{display:block;margin-bottom:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;color:var(--clay)}
.section__title{font-size:clamp(24px,3.2vw,40px);line-height:1.08}
.section__desc{color:var(--muted);font-size:15px;max-width:30em}
@media (max-width:767px){.section__head{grid-template-columns:1fr}}

/* grid */
.grid{display:grid;gap:clamp(16px,2.4vw,34px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--8-3{grid-template-columns:minmax(0,8fr) minmax(0,3fr)}
@media (max-width:899px){.grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:767px){
  .grid--2,.grid--3,.grid--7-5,.grid--8-3{grid-template-columns:1fr}
}

/* card */
.card{position:relative;display:flex;flex-direction:column;gap:12px;padding:clamp(18px,2.4vw,30px);background:var(--card-bg);border:1px solid var(--line-c);border-radius:2px;transition:border-color .18s var(--ease),transform .18s var(--ease)}
.card:hover{border-color:rgba(30,91,255,.55)}
.theme-ink .card:hover{border-color:rgba(56,242,214,.5)}
.card__num{font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:var(--clay)}
.card__title{font-size:clamp(18px,1.6vw,22px);font-weight:800;letter-spacing:-.01em;line-height:1.35}
.card__text{font-size:14.5px;line-height:1.8;color:var(--muted)}

/* tag */
.tag{display:inline-flex;align-items:center;gap:6px;padding:5px 8px;border:1px solid var(--clay);border-radius:1px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;color:var(--clay);white-space:nowrap}
.tag--live{background:var(--cyan);border-color:var(--cyan);color:var(--ink);font-weight:700}

/* media */
.media{position:relative;display:block;overflow:hidden;background:var(--ink-2);border:1px solid var(--line-c);border-radius:2px}
.media > img,.media > picture > img,.media > svg,.media > video{display:block;width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--21x9{aspect-ratio:21/9}
.media--placeholder{
  background-color:var(--ink-2);
  background-image:
    repeating-linear-gradient(90deg,rgba(56,242,214,.14) 0 1px,transparent 1px 56px),
    repeating-linear-gradient(0deg,rgba(56,242,214,.1) 0 1px,transparent 1px 56px),
    radial-gradient(circle at 78% 22%,rgba(30,91,255,.5),transparent 62%);
}
.media__tag{position:absolute;top:12px;left:12px;z-index:2}
.media__caption{margin-top:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--muted)}

/* index list */
.index-list{display:flex;flex-direction:column;border-top:1px solid var(--line-c)}
.index-row{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:clamp(12px,2vw,24px);align-items:baseline;padding:14px 4px;border-bottom:1px solid var(--line-c);transition:background .16s var(--ease),color .16s var(--ease)}
.index-row:hover{background:rgba(30,91,255,.07)}
.theme-ink .index-row:hover{background:rgba(56,242,214,.08)}
.index-row__num{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--clay)}
.index-row__title{font-size:15.5px;font-weight:700;letter-spacing:-.005em}
.index-row__meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--muted);white-space:nowrap}
@media (max-width:600px){
  .index-row{grid-template-columns:auto minmax(0,1fr)}
  .index-row__meta{grid-column:2;white-space:normal}
}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{padding:7px 12px;border:1px solid var(--line-c);border-radius:2px;background:transparent;color:var(--muted);font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;transition:color .16s var(--ease),border-color .16s var(--ease),background .16s var(--ease)}
.chip:hover{color:var(--fg);border-color:currentColor}
.chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:var(--ink);font-weight:700}

/* accordion */
.acc{display:flex;flex-direction:column;border-top:1px solid var(--line-c)}
.acc__item{border-bottom:1px solid var(--line-c)}
.acc__btn{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;width:100%;padding:18px 2px;text-align:left;font-family:inherit;font-size:clamp(15.5px,1.4vw,18px);font-weight:700;line-height:1.5;color:var(--fg);transition:color .16s var(--ease)}
.acc__btn:hover{color:var(--blue)}
.theme-ink .acc__btn:hover{color:var(--cyan)}
.acc__sign{position:relative;flex:0 0 auto;width:16px;height:16px;margin-top:5px}
.acc__sign::before,.acc__sign::after{content:"";position:absolute;background:currentColor;transition:transform .2s var(--ease),opacity .2s var(--ease)}
.acc__sign::before{left:0;top:7px;width:16px;height:2px}
.acc__sign::after{left:7px;top:0;width:2px;height:16px}
.acc__btn[aria-expanded="true"] .acc__sign::after{transform:scaleY(0);opacity:0}
.acc__panel{max-height:0;overflow:hidden;transition:max-height .22s var(--ease)}
.acc__body{max-width:42em;padding:0 2px 20px;color:var(--muted);font-size:15px;line-height:1.85}

/* ---------- 6. HEADER ---------- */
.skip-link{
  position:fixed;left:14px;top:14px;z-index:400;
  transform:translateY(-180%);
  padding:10px 16px;border:2px solid var(--ink);border-radius:2px;
  background:var(--cyan);color:var(--ink);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;font-weight:700;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}
.site-header{position:sticky;top:0;z-index:60}

/* rail */
.rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail);z-index:80;
  display:flex;flex-direction:column;align-items:center;
  padding:16px 8px 14px;
  background:var(--ink);color:var(--t-ink);
  border-right:1px solid rgba(56,242,214,.16);
  overflow-y:auto;overscroll-behavior:contain;
}
.rail__head{display:flex;flex-direction:column;align-items:center;gap:10px;width:100%;padding-bottom:16px;border-bottom:1px solid var(--line-ink)}
.rail__brand{display:flex;flex-direction:column;align-items:center;gap:9px;text-align:center}
.rail__brand-mark{display:grid;place-items:center;width:38px;height:38px;background:var(--blue);color:var(--paper);border-bottom:2px solid var(--cyan);border-radius:2px;font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.02em}
.rail__brand-cn{writing-mode:vertical-rl;font-size:13px;font-weight:800;letter-spacing:.28em;line-height:1;color:var(--t-ink)}
.rail__brand-en{writing-mode:vertical-rl;font-family:var(--font-mono);font-size:9px;letter-spacing:.32em;color:#7E9A94}
.rail__close{display:none}
.rail__nav{flex:1 1 auto;width:100%;min-height:0;padding:14px 0;overflow-y:auto}
.rail__list{display:flex;flex-direction:column;gap:2px;width:100%}
.rail__item{width:100%}
.rail__link{position:relative;display:flex;flex-direction:column;align-items:center;gap:4px;padding:9px 4px;color:#A9C0BA;transition:color .18s var(--ease),background .18s var(--ease)}
.rail__link:hover{color:var(--t-ink);background:rgba(56,242,214,.07)}
.rail__num{font-family:var(--font-mono);font-size:9px;letter-spacing:.18em;color:#5F7C76;transition:color .18s var(--ease)}
.rail__label{font-size:12px;font-weight:700;letter-spacing:.04em;line-height:1.3;text-align:center}
.rail__link:hover .rail__num{color:var(--cyan)}
.rail__link[aria-current="page"]{color:var(--cyan);background:rgba(56,242,214,.09)}
.rail__link[aria-current="page"] .rail__num{color:var(--cyan)}
.rail__link[aria-current="page"]::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:22px;background:var(--cyan)}
.rail__foot{width:100%;display:flex;flex-direction:column;align-items:center;gap:10px;padding-top:14px;border-top:1px solid var(--line-ink)}
.rail__cta{width:100%;padding:11px 6px;font-size:12.5px;letter-spacing:.06em}
.rail__meta{font-family:var(--font-mono);font-size:9px;line-height:1.6;letter-spacing:.08em;color:#6E8C86;text-align:center}

/* topbar */
.topbar{background:var(--ink);color:var(--t-ink);border-bottom:1px solid var(--line-ink)}
.topbar__inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:46px;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.topbar__note{margin:0;font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:#8FA9A3;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.util{display:flex;align-items:center;gap:clamp(10px,2vw,26px)}
.util__item{display:block}
.util__link{display:inline-block;padding:4px 0;font-size:12.5px;font-weight:600;letter-spacing:.06em;color:#C7D8D4;border-bottom:1px solid transparent;transition:color .16s var(--ease),border-color .16s var(--ease)}
.util__link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.util__link--new{color:var(--cyan)}
.util__link--new::before{content:"";display:inline-block;width:5px;height:5px;margin-right:8px;background:var(--cyan);vertical-align:middle}

/* mobile bar */
.mobilebar{display:none}
.navtoggle{display:inline-flex;align-items:center;gap:7px;padding:8px 11px;border:1px solid var(--orange);border-radius:2px;background:var(--orange);color:var(--ink);font-size:12px;font-weight:800;transition:background .16s var(--ease),border-color .16s var(--ease)}
.navtoggle:hover{background:var(--orange-hi);border-color:var(--orange-hi)}
.navtoggle__bars{display:grid;gap:3px;width:14px}
.navtoggle__bars span{display:block;height:2px;background:currentColor;transition:transform .18s var(--ease)}
.navtoggle__bars span:last-child{width:9px}
.navtoggle[aria-expanded="true"] .navtoggle__bars span:first-child{transform:translateY(2.5px) rotate(45deg)}
.navtoggle[aria-expanded="true"] .navtoggle__bars span:last-child{width:14px;transform:translateY(-2.5px) rotate(-45deg)}
.navtoggle__text{letter-spacing:.08em}

/* scrim */
.scrim{position:fixed;inset:0;z-index:70;background:rgba(4,18,16,.62);opacity:0;visibility:hidden;transition:opacity .22s var(--ease),visibility .22s var(--ease)}
.site-header[data-open] .scrim{opacity:1;visibility:visible}

/* progress */
.progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:90;pointer-events:none;background:rgba(56,242,214,.14)}
.progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cyan),var(--blue))}
@media (min-width:1024px){.progress{left:var(--rail)}}

/* ---------- 7. FOOTER ---------- */
.site-footer{
  position:relative;
  color:var(--t-ink);
  border-top:1px solid rgba(56,242,214,.28);
  background-color:var(--ink);
  background-image:
    radial-gradient(circle at 86% 6%,rgba(30,91,255,.28),transparent 58%),
    repeating-linear-gradient(90deg,rgba(56,242,214,.07) 0 1px,transparent 1px 132px);
}
.site-footer > .wrap{padding-top:clamp(40px,5vw,76px);padding-bottom:26px}
.foot__grid{display:grid;grid-template-columns:1.15fr 2.1fr 1.3fr;gap:clamp(24px,3.4vw,56px);align-items:start}
.foot__brandblock{display:flex;flex-direction:column;gap:12px}
.foot__brand{font-size:clamp(26px,2.6vw,34px);font-weight:900;letter-spacing:-.01em;line-height:1.05;color:var(--t-ink)}
.foot__brand-en{font-family:var(--font-mono);font-size:10px;letter-spacing:.3em;color:var(--cyan)}
.foot__claim{font-size:15px;line-height:1.7;color:#B7CCC7;max-width:20em}
.foot__meta{font-family:var(--font-mono);font-size:11px;line-height:1.9;letter-spacing:.1em;color:#7E9A94}
.foot__nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(14px,2vw,28px);border-left:1px solid var(--line-ink);padding-left:clamp(16px,2vw,32px)}
.foot__col{display:flex;flex-direction:column;gap:10px}
.foot__col-title{display:flex;align-items:baseline;gap:8px;font-size:13px;font-weight:800;letter-spacing:.06em;color:var(--t-ink)}
.foot__col-num{font-family:var(--font-mono);font-size:9px;letter-spacing:.16em;color:var(--clay)}
.foot__links{display:flex;flex-direction:column;gap:7px}
.foot__link{display:inline-block;padding:2px 0;font-size:13.5px;color:#B7CCC7;transition:color .16s var(--ease),transform .16s var(--ease)}
.foot__link:hover{color:var(--cyan);transform:translateX(3px)}
.foot__contact{display:flex;flex-direction:column;gap:10px;border-left:1px solid var(--line-ink);padding-left:clamp(16px,2vw,32px)}
.foot__contact-title{font-size:13px;font-weight:800;letter-spacing:.06em;color:var(--t-ink)}
.foot__contact-list{display:flex;flex-direction:column;gap:9px}
.foot__contact-row{display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px;align-items:baseline;font-size:13.5px;line-height:1.7;color:#D3E3DF}
.foot__contact-key{font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;color:#7E9A94;white-space:nowrap}
.foot__contact-val{word-break:break-word;color:#E4F1EE}
.foot__note{margin-top:2px;padding-left:10px;border-left:2px solid var(--clay);font-size:11.5px;line-height:1.8;color:#7E9A94}
.foot__legal{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin-top:clamp(28px,3vw,44px);padding-top:16px;border-top:1px solid var(--line-ink)}
.foot__copy{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:#7E9A94}
.foot__legal-links{display:flex;flex-wrap:wrap;gap:8px 18px}
.foot__legal-link{padding-bottom:2px;border-bottom:1px solid transparent;font-size:12px;color:#A9C0BA;transition:color .16s var(--ease),border-color .16s var(--ease)}
.foot__legal-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

/* ---------- 8. RESPONSIVE SHELL ---------- */
@media (max-width:1099px){
  .foot__grid{grid-template-columns:1fr 1fr;gap:32px}
  .foot__brandblock{grid-column:1 / -1}
  .foot__nav{border-left:0;padding-left:0}
}
@media (max-width:767px){
  .foot__grid{grid-template-columns:1fr}
  .foot__nav{grid-template-columns:1fr 1fr;gap:20px 18px;padding-top:18px;border-top:1px solid var(--line-ink)}
  .foot__contact{border-left:0;padding-left:0;padding-top:18px;border-top:1px solid var(--line-ink)}
  .foot__legal{flex-direction:column;align-items:flex-start}
}
@media (min-width:1024px){
  .scrim{display:none}
  .mobilebar{display:none}
}
@media (max-width:1023px){
  .topbar{display:none}
  .mobilebar{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:56px;padding:10px var(--gutter);background:var(--ink);color:var(--t-ink);border-bottom:1px solid var(--line-ink)}
  .mobilebar__brand{display:flex;align-items:baseline;gap:8px;font-size:16px;font-weight:800;letter-spacing:.08em;color:var(--t-ink)}
  .mobilebar__brand-en{font-family:var(--font-mono);font-size:9px;letter-spacing:.22em;color:var(--cyan);font-weight:400}
  .mobilebar__tools{display:flex;align-items:center;gap:8px}
  .mobilebar__tool{padding:6px 8px;border:1px solid rgba(234,247,244,.22);border-radius:2px;font-size:12px;font-weight:600;color:#C7D8D4;white-space:nowrap;transition:color .16s var(--ease),border-color .16s var(--ease)}
  .mobilebar__tool:hover{color:var(--cyan);border-color:rgba(56,242,214,.55)}

  .rail{
    width:min(84vw,340px);
    align-items:stretch;
    padding:20px 20px 18px;
    transform:translateX(-100%);
    visibility:hidden;
    transition:transform .24s var(--ease),visibility .24s var(--ease);
  }
  .site-header[data-open] .rail{transform:none;visibility:visible;box-shadow:24px 0 60px rgba(0,0,0,.45)}
  .rail__head{flex-direction:row;align-items:center;justify-content:space-between;gap:12px;padding-bottom:14px}
  .rail__brand{flex-direction:row;align-items:center;gap:10px;text-align:left}
  .rail__brand-cn{writing-mode:horizontal-tb;font-size:15px;letter-spacing:.14em}
  .rail__brand-en{writing-mode:horizontal-tb;font-size:9px;letter-spacing:.24em}
  .rail__close{display:inline-flex;align-items:center;gap:6px;padding:7px 10px;border:1px solid rgba(56,242,214,.45);border-radius:2px;color:var(--cyan);font-family:var(--font-mono);font-size:11px;letter-spacing:.12em}
  .rail__close:hover{background:rgba(56,242,214,.12)}
  .rail__close-icon{font-size:10px;line-height:1}
  .rail__close-text{line-height:1}
  .rail__nav{padding:14px 0 0;overflow:visible}
  .rail__list{gap:0}
  .rail__link{flex-direction:row;align-items:baseline;gap:12px;padding:14px 10px;border-bottom:1px solid rgba(234,247,244,.08)}
  .rail__label{font-size:16px;font-weight:700;text-align:left}
  .rail__num{font-size:11px}
  .rail__link[aria-current="page"]::before{top:12px;bottom:12px;height:auto;transform:none}
  .rail__foot{margin-top:auto}
  .rail__cta{font-size:14px;padding:14px 10px}
  .rail__meta{font-size:10px}
}
@media (max-width:480px){
  .mobilebar__brand{font-size:15px;letter-spacing:.04em}
  .mobilebar__brand-en{display:none}
  .mobilebar__tool{font-size:11px;padding:5px 7px}
  .navtoggle{padding:7px 9px}
  .navtoggle__text{display:none}
}

/* ---------- 9. A11Y & MOTION ---------- */
:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
.rail :focus-visible,
.topbar :focus-visible,
.mobilebar :focus-visible,
.site-footer :focus-visible,
.theme-ink :focus-visible{outline-color:var(--cyan)}
.skip-link:focus-visible{outline-color:var(--ink)}

[data-js] [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
[data-js] [data-reveal][data-revealed]{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    transition-duration:.001ms !important;
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    scroll-behavior:auto !important;
  }
  [data-js] [data-reveal]{opacity:1;transform:none}
}