/* ============================================================
   云开赛事 · 共享样式表  /assets/site.css
   夜场转播间 × 出版目录：深空蓝底、云纸奶油阅读面、刻度与斜切
   ============================================================ */

/* ---------- 1. 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,p,ul,ol,li,figure,blockquote,dl,dd,pre{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,picture{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
hr{border:0}
[id]{scroll-margin-top:clamp(120px,18vh,190px)}

/* ---------- 2. 变量 ---------- */
:root{
  --c-space:#0A1730;
  --c-night:#10294A;
  --c-cream:#F3EDE1;
  --c-gold:#E4D9C3;
  --c-kai:#6FD9D0;
  --c-signal:#FF6A2B;
  --c-data:#B4F04D;
  --c-mist:#C6D4E6;
  --c-note:#5C6B7E;
  --c-rust:#C0462C;

  --ink-on-dark:#E6EDF7;
  --ink-on-light:#22282F;
  --ink-quiet-dark:rgba(198,212,230,.78);
  --ink-quiet-light:#5C6B7E;

  --f-sans:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
  --f-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --shell:1240px;
  --gut:clamp(16px,4vw,40px);
  --r-pill:999px;
  --r-card:22px;
  --r-soft:14px;
  --dur:240ms;
  --ease:cubic-bezier(.22,.61,.36,1);
  --focus-ring:var(--c-kai);
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--f-sans);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.012em;
  color:var(--ink-on-dark);
  background:var(--c-space);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  min-height:100vh;
  overflow-x:hidden;
}
::selection{background:var(--c-kai);color:var(--c-space)}

.yk-display{font-size:clamp(40px,7vw,92px);line-height:1.02;letter-spacing:-.02em;font-weight:800}
.yk-headline{font-size:clamp(28px,4vw,40px);line-height:1.18;letter-spacing:-.01em;font-weight:700}
.yk-title{font-size:clamp(20px,2.4vw,26px);line-height:1.35;font-weight:700}
.yk-num{font-family:var(--f-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.yk-eyebrow{
  font-family:var(--f-mono);font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--c-kai);font-weight:600;
}
.yk-note{font-size:13px;line-height:1.7;color:var(--ink-quiet-dark)}
.yk-vnote{
  writing-mode:vertical-rl;text-orientation:mixed;
  font-size:12px;letter-spacing:.3em;color:var(--c-rust);
}
.yk-meta{
  display:flex;flex-wrap:wrap;gap:6px 16px;
  font-family:var(--f-mono);font-size:12.5px;letter-spacing:.06em;
  color:var(--ink-quiet-dark);
}
.yk-tag{
  display:inline-flex;align-items:center;
  padding:3px 11px;border-radius:var(--r-pill);
  border:1px solid rgba(111,217,208,.45);
  font-family:var(--f-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--c-kai);background:rgba(111,217,208,.08);
}
.yk-tag--signal{border-color:rgba(255,106,43,.5);color:var(--c-signal);background:rgba(255,106,43,.1)}
.yk-tag--data{border-color:rgba(180,240,77,.45);color:var(--c-data);background:rgba(180,240,77,.1)}

/* ---------- 4. 焦点与动效基线 ---------- */
:focus-visible{outline:2px solid var(--focus-ring);outline-offset:2px}
.yk-section--paper{--focus-ring:#0A1730}
.yk-skip{position:absolute;left:50%;top:-120px;transform:translateX(-50%);z-index:300;
  padding:10px 22px;border-radius:0 0 var(--r-soft) var(--r-soft);
  background:var(--c-signal);color:#170A02;font-weight:700;font-size:15px;
  transition:top var(--dur) var(--ease)}
.yk-skip:focus{top:0}

.has-js [data-reveal]{opacity:0;transform:translateY(14px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease)}
.has-js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 5. 容器与分区 ---------- */
.yk-shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gut)}

.yk-section{padding-block:clamp(44px,7vw,96px);position:relative}
.yk-section--space{background:var(--c-space);color:var(--ink-on-dark);
  background-image:radial-gradient(120% 140% at 50% -30%,rgba(111,217,208,.14),transparent 62%)}
.yk-section--night{background:var(--c-night);color:var(--ink-on-dark)}
.yk-section--paper{background:var(--c-cream);color:var(--ink-on-light)}
.yk-section--paper .yk-note,
.yk-section--paper .yk-meta{color:var(--ink-quiet-light)}
.yk-section--paper .yk-eyebrow{color:#1C6E68}
.yk-section--paper .yk-tag{border-color:rgba(28,110,104,.4);color:#1C6E68;background:rgba(28,110,104,.08)}

.yk-section__head{display:grid;gap:12px;max-width:820px;margin-bottom:clamp(24px,4vw,44px)}
.yk-section__lead{font-size:17px;color:var(--ink-quiet-dark);max-width:64ch}
.yk-section--paper .yk-section__lead{color:var(--ink-quiet-light)}

.yk-slash{
  display:block;height:clamp(32px,5vw,68px);
  background:var(--yk-slash-from,var(--c-space));position:relative;
}
.yk-slash::after{
  content:"";position:absolute;inset:0;
  background:var(--yk-slash-to,var(--c-cream));
  clip-path:polygon(0 100%,100% 0,100% 100%,0 100%);
}
.yk-scale-rule{
  height:12px;
  background-image:repeating-linear-gradient(90deg,rgba(111,217,208,.55) 0 1px,transparent 1px 22px);
  border-block:1px solid rgba(111,217,208,.22);
}
.yk-section--paper .yk-scale-rule{
  background-image:repeating-linear-gradient(90deg,rgba(92,107,126,.5) 0 1px,transparent 1px 22px);
  border-color:rgba(92,107,126,.28);
}

/* ---------- 6. 页头 ---------- */
.yk-masthead{
  position:sticky;top:0;z-index:120;
  background:var(--c-space);color:var(--ink-on-dark);
  border-bottom:1px solid rgba(111,217,208,.28);
  background-image:radial-gradient(120% 170% at 50% -50%,rgba(111,217,208,.17),transparent 62%);
}
.yk-progress{
  position:absolute;left:0;bottom:0;height:2px;width:0;z-index:6;
  background:linear-gradient(90deg,var(--c-kai),var(--c-signal));
  transition:width 140ms linear;
}
.yk-masthead__strip{border-bottom:1px dashed rgba(198,212,230,.2);font-size:12.5px}
.yk-masthead__strip-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:12px 20px;padding-block:8px;flex-wrap:wrap;
}
.yk-masthead__note{
  font-family:var(--f-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--ink-quiet-dark);
}
.yk-masthead__utility{display:flex;align-items:center;gap:20px}
.yk-masthead__utility a{
  font-size:12.5px;letter-spacing:.06em;color:var(--ink-quiet-dark);
  border-bottom:1px dashed rgba(198,212,230,.35);padding-bottom:1px;
  transition:color var(--dur),border-color var(--dur);
}
.yk-masthead__utility a:hover{color:var(--c-kai);border-bottom-color:var(--c-kai)}

.yk-masthead__mast{padding-block:clamp(12px,2.4vw,22px) clamp(8px,1.6vw,14px)}
.yk-masthead__mast-inner{display:flex;justify-content:center}
.yk-brand{display:inline-flex;align-items:center;gap:14px;text-align:left}
.yk-brand__seal{
  flex:0 0 auto;width:44px;height:44px;border-radius:50%;
  display:grid;place-items:center;gap:0;
  border:1.5px solid var(--c-kai);color:var(--c-kai);
  font-family:var(--f-mono);font-size:12px;line-height:1.05;letter-spacing:.02em;
  background:rgba(111,217,208,.08);
}
.yk-brand__seal span{display:block}
.yk-brand__text{display:flex;flex-direction:column;gap:2px}
.yk-brand__name{
  font-size:clamp(24px,3.6vw,38px);font-weight:800;line-height:1.1;
  letter-spacing:.08em;color:#fff;
}
.yk-brand__kicker{
  font-family:var(--f-mono);font-size:10.5px;letter-spacing:.24em;
  color:var(--c-kai);text-transform:uppercase;
}

.yk-nav{
  border-top:1px solid rgba(111,217,208,.2);
  background:rgba(10,23,48,.86);
  backdrop-filter:saturate(140%) blur(6px);
}
.yk-nav__inner{
  position:relative;display:flex;align-items:center;justify-content:center;
  gap:12px;min-height:54px;
}
.yk-nav__list{display:flex;flex-wrap:wrap;justify-content:center;gap:2px;padding-block:6px}
.yk-nav__link{
  display:block;padding:9px 15px;border-radius:var(--r-pill);
  font-size:15px;letter-spacing:.03em;color:rgba(230,237,247,.84);
  border:1px solid transparent;
  transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.yk-nav__link:hover{color:#fff;background:rgba(111,217,208,.12);border-color:rgba(111,217,208,.4)}
.yk-nav__link[aria-current="page"]{
  color:var(--c-space);background:var(--c-kai);font-weight:700;border-color:var(--c-kai);
}
.yk-nav__cta{
  position:absolute;right:var(--gut);top:50%;transform:translateY(-50%);
  font-size:14px;padding:9px 20px;
}
.yk-nav-toggle{
  display:none;align-items:center;justify-content:space-between;gap:14px;
  width:100%;padding:10px 14px;border-radius:var(--r-soft);
  border:1px solid rgba(111,217,208,.4);
  color:var(--c-kai);font-size:14px;font-weight:700;letter-spacing:.14em;
  background:rgba(111,217,208,.08);
}
.yk-nav-toggle__label{font-family:var(--f-mono)}
.yk-nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:20px}
.yk-nav-toggle__bars span{display:block;height:1.5px;border-radius:2px;background:currentColor}
.yk-nav-toggle[aria-expanded="true"] .yk-nav-toggle__bars span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.yk-nav-toggle[aria-expanded="true"] .yk-nav-toggle__bars span:nth-child(2){opacity:0}
.yk-nav-toggle[aria-expanded="true"] .yk-nav-toggle__bars span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
.yk-nav-toggle__bars span{transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease)}

/* ---------- 7. 按钮 ---------- */
.yk-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 24px;border-radius:var(--r-pill);
  font-size:15px;font-weight:700;letter-spacing:.03em;
  border:1px solid transparent;
  transition:transform var(--dur) var(--ease),background-color var(--dur),color var(--dur),border-color var(--dur),box-shadow var(--dur);
}
.yk-btn--signal{background:var(--c-signal);color:#180A02}
.yk-btn--signal:hover{transform:translateY(-2px);box-shadow:0 12px 26px -14px rgba(255,106,43,.92)}
.yk-btn--kai{background:var(--c-kai);color:var(--c-space)}
.yk-btn--kai:hover{transform:translateY(-2px);box-shadow:0 12px 26px -14px rgba(111,217,208,.85)}
.yk-btn--ghost{border-color:rgba(111,217,208,.5);color:var(--c-kai);background:transparent}
.yk-btn--ghost:hover{background:rgba(111,217,208,.12);transform:translateY(-2px)}
.yk-section--paper .yk-btn--ghost{border-color:rgba(10,23,48,.35);color:#0A1730}
.yk-section--paper .yk-btn--ghost:hover{background:rgba(10,23,48,.07)}
.yk-btn--sm{padding:7px 16px;font-size:13px}

/* ---------- 8. 网格与卡片 ---------- */
.yk-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:clamp(14px,2vw,26px)}
.yk-span-2{grid-column:span 2}
.yk-span-3{grid-column:span 3}
.yk-span-4{grid-column:span 4}
.yk-span-5{grid-column:span 5}
.yk-span-6{grid-column:span 6}
.yk-span-7{grid-column:span 7}
.yk-span-8{grid-column:span 8}
.yk-span-9{grid-column:span 9}
.yk-span-10{grid-column:span 10}
.yk-span-12{grid-column:span 12}

.yk-card{
  position:relative;display:flex;flex-direction:column;gap:10px;
  padding:clamp(16px,2.2vw,26px);
  border-radius:var(--r-card);
  background:var(--c-night);
  border:1px solid rgba(111,217,208,.22);
  color:var(--ink-on-dark);
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.yk-card--paper{background:var(--c-cream);border-color:rgba(34,40,47,.16);color:var(--ink-on-light)}
.yk-card--gold{background:var(--c-gold);border-color:rgba(34,40,47,.14);color:var(--ink-on-light)}
.yk-card__no{
  font-family:var(--f-mono);font-size:12px;letter-spacing:.2em;
  color:var(--c-kai);
}
.yk-card--paper .yk-card__no,.yk-card--gold .yk-card__no{color:#1C6E68}
.yk-card__title{font-size:clamp(18px,2vw,22px);line-height:1.35;font-weight:700}
.yk-card__body{font-size:15.5px;line-height:1.78;color:var(--ink-quiet-dark)}
.yk-card--paper .yk-card__body,.yk-card--gold .yk-card__body{color:var(--ink-quiet-light)}
.yk-card__foot{margin-top:auto;padding-top:10px}
@media (hover:hover){
  .yk-card:hover{transform:translateY(-4px);border-color:var(--c-kai);
    box-shadow:0 22px 42px -28px rgba(0,0,0,.85)}
}

/* ---------- 9. 框景与图片容器 ---------- */
.yk-frame{
  position:relative;padding:clamp(18px,2.6vw,34px);
  border:1px solid rgba(111,217,208,.3);
  border-radius:var(--r-card);
  background:rgba(16,41,74,.55);
}
.yk-frame::before,.yk-frame::after{
  content:"";position:absolute;width:26px;height:26px;border:2px solid var(--c-kai);
}
.yk-frame::before{top:-1px;left:-1px;border-right:0;border-bottom:0;border-radius:var(--r-card) 0 0 0}
.yk-frame::after{bottom:-1px;right:-1px;border-left:0;border-top:0;border-radius:0 0 var(--r-card) 0}
.yk-section--paper .yk-frame{background:rgba(228,217,195,.5);border-color:rgba(10,23,48,.2)}
.yk-section--paper .yk-frame::before,
.yk-section--paper .yk-frame::after{border-color:#1C6E68}

.yk-media{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--r-card);
  border:1px solid rgba(111,217,208,.22);
  background:linear-gradient(160deg,#0A1730 0%,#10294A 58%,#0A1730 100%);
}
.yk-media > img,.yk-media > svg{width:100%;height:100%;object-fit:cover}
.yk-media--16-9{aspect-ratio:16/9}
.yk-media--4-3{aspect-ratio:4/3}
.yk-media--3-2{aspect-ratio:3/2}
.yk-media--1-1{aspect-ratio:1/1}
.yk-media--3-4{aspect-ratio:3/4}
.yk-media__ph{
  position:absolute;inset:0;display:grid;place-items:center;
  font-family:var(--f-mono);font-size:12px;letter-spacing:.18em;
  color:rgba(198,212,230,.6);text-align:center;padding:16px;
}
.yk-media__cap{
  position:absolute;left:0;right:0;bottom:0;
  padding:26px 16px 12px;font-size:12.5px;line-height:1.6;
  color:var(--ink-on-dark);
  background:linear-gradient(to top,rgba(10,23,48,.92),transparent);
}
.yk-media__tag{
  position:absolute;top:12px;left:12px;
  padding:3px 11px;border-radius:var(--r-pill);
  font-family:var(--f-mono);font-size:11px;letter-spacing:.1em;
  background:rgba(10,23,48,.78);color:var(--c-data);
  border:1px solid rgba(180,240,77,.4);
}

/* ---------- 10. 正文、面包屑、锚点目录、筛选 ---------- */
.yk-crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;
  font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;
  color:var(--ink-quiet-dark);margin-bottom:clamp(16px,2.4vw,26px);
}
.yk-crumbs li{display:flex;align-items:center;gap:10px}
.yk-crumbs li + li::before{content:"/";color:rgba(198,212,230,.45)}
.yk-crumbs a{border-bottom:1px dashed rgba(198,212,230,.4)}
.yk-crumbs a:hover{color:var(--c-kai);border-bottom-color:var(--c-kai)}
.yk-section--paper .yk-crumbs{color:var(--ink-quiet-light)}
.yk-section--paper .yk-crumbs a{border-bottom-color:rgba(92,107,126,.5)}

.yk-prose{max-width:68ch;font-size:17px;line-height:1.85}
.yk-prose p + p{margin-top:1.1em}
.yk-prose h2{margin-top:1.9em;margin-bottom:.5em;font-size:clamp(22px,2.6vw,30px);line-height:1.3;font-weight:700}
.yk-prose h3{margin-top:1.5em;margin-bottom:.4em;font-size:clamp(18px,2vw,21px);font-weight:700}
.yk-prose ul,.yk-prose ol{margin-block:1em;padding-left:1.3em;list-style:disc}
.yk-prose ol{list-style:decimal}
.yk-prose li{margin-block:.4em}
.yk-prose a{border-bottom:1px solid var(--c-kai);color:inherit}
.yk-prose blockquote{padding:14px 20px;border-left:3px solid var(--c-kai);background:rgba(111,217,208,.08);border-radius:0 var(--r-soft) var(--r-soft) 0}
.yk-prose--paper{color:var(--ink-on-light)}
.yk-prose--paper a{border-bottom-color:#1C6E68}
.yk-prose--paper blockquote{border-left-color:#1C6E68;background:rgba(228,217,195,.6)}

.yk-anchor{font-size:14px}
.yk-anchor__title{
  font-family:var(--f-mono);font-size:11.5px;letter-spacing:.2em;
  color:var(--c-kai);margin-bottom:10px;
}
.yk-anchor__list{display:flex;flex-direction:column;gap:2px;border-left:1px solid rgba(111,217,208,.28);padding-left:2px}
.yk-anchor__link{
  display:block;padding:7px 12px;border-left:2px solid transparent;
  color:var(--ink-quiet-dark);
  transition:color var(--dur),border-color var(--dur),background-color var(--dur);
}
.yk-anchor__link:hover{color:var(--c-kai);background:rgba(111,217,208,.08)}
.yk-anchor__link.is-active{color:var(--c-signal);border-left-color:var(--c-signal);font-weight:700}
.yk-section--paper .yk-anchor__title{color:#1C6E68}
.yk-section--paper .yk-anchor__list{border-left-color:rgba(92,107,126,.35)}
.yk-section--paper .yk-anchor__link{color:var(--ink-quiet-light)}
.yk-section--paper .yk-anchor__link:hover{color:#0A1730;background:rgba(10,23,48,.06)}
.yk-section--paper .yk-anchor__link.is-active{color:var(--c-rust);border-left-color:var(--c-rust)}

.yk-filter{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:clamp(18px,3vw,30px)}
.yk-filter__btn{
  padding:8px 18px;border-radius:var(--r-pill);
  border:1px solid rgba(111,217,208,.35);
  font-size:14px;letter-spacing:.04em;color:rgba(230,237,247,.82);
  transition:color var(--dur),background-color var(--dur),border-color var(--dur);
}
.yk-filter__btn:hover{border-color:var(--c-kai);color:#fff}
.yk-filter__btn[aria-pressed="true"]{background:var(--c-kai);color:var(--c-space);border-color:var(--c-kai);font-weight:700}
.yk-filter__count{
  font-family:var(--f-mono);font-size:12px;letter-spacing:.1em;
  color:var(--c-data);margin-left:4px;
}
.yk-section--paper .yk-filter__btn{border-color:rgba(10,23,48,.25);color:#22282F}
.yk-section--paper .yk-filter__btn:hover{border-color:#0A1730}
.yk-section--paper .yk-filter__btn[aria-pressed="true"]{background:#0A1730;color:var(--c-cream);border-color:#0A1730}
.yk-section--paper .yk-filter__count{color:#1C6E68}
.yk-empty{display:none;padding:24px;border-radius:var(--r-card);
  border:1px dashed rgba(111,217,208,.4);font-size:15px;color:var(--ink-quiet-dark)}
.yk-empty.is-shown{display:block}

.yk-copy{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:var(--r-pill);
  border:1px solid rgba(111,217,208,.4);
  font-family:var(--f-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--c-kai);background:rgba(111,217,208,.08);
  transition:background-color var(--dur),color var(--dur),border-color var(--dur);
}
.yk-copy:hover{background:rgba(111,217,208,.2)}
.yk-copy.is-copied{background:var(--c-data);color:var(--c-space);border-color:var(--c-data)}

/* ---------- 11. 页脚 ---------- */
.yk-footer{
  position:relative;
  background:var(--c-space);color:var(--ink-on-dark);
  border-top:1px solid rgba(111,217,208,.24);
  background-image:radial-gradient(85% 130% at 8% 0%,rgba(111,217,208,.13),transparent 58%);
  padding-block:clamp(36px,6vw,68px) calc(26px + env(safe-area-inset-bottom));
  font-size:15px;
}
.yk-footer__scale{
  display:block;height:14px;margin-bottom:clamp(26px,4vw,44px);
  background-image:repeating-linear-gradient(90deg,rgba(111,217,208,.45) 0 1px,transparent 1px 24px);
  border-bottom:1px solid rgba(111,217,208,.18);
}
.yk-footer__grid{
  display:grid;
  grid-template-columns:minmax(220px,1.4fr) repeat(3,minmax(130px,.75fr));
  gap:clamp(22px,4vw,52px);
}
.yk-footer__logo{font-size:clamp(22px,2.6vw,30px);font-weight:800;letter-spacing:.1em;line-height:1.2}
.yk-footer__tag{margin-top:8px;font-size:13px;line-height:1.7;color:var(--ink-quiet-dark)}
.yk-footer__col-title{
  font-family:var(--f-mono);font-size:11.5px;letter-spacing:.2em;
  color:var(--c-kai);margin-bottom:12px;
}
.yk-footer__links{display:flex;flex-direction:column;gap:8px}
.yk-footer__links a{
  display:inline-block;font-size:15px;color:rgba(230,237,247,.78);
  border-bottom:1px dashed transparent;padding-bottom:1px;
  transition:color var(--dur),border-color var(--dur);
}
.yk-footer__links a:hover{color:var(--c-kai);border-bottom-color:rgba(111,217,208,.65)}
.yk-footer__contact{
  margin-top:clamp(26px,4vw,44px);padding-top:clamp(18px,3vw,28px);
  border-top:1px solid rgba(198,212,230,.16);
}
.yk-footer__contact-title{
  font-family:var(--f-mono);font-size:11.5px;letter-spacing:.2em;
  color:var(--c-kai);margin-bottom:12px;
}
.yk-footer__contact-list{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:8px 30px;font-size:13.5px;line-height:1.75;color:var(--ink-quiet-dark);
}
.yk-footer__legal{
  margin-top:clamp(22px,3vw,34px);padding-top:18px;
  border-top:1px dashed rgba(198,212,230,.18);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 24px;
  font-family:var(--f-mono);font-size:12.5px;letter-spacing:.05em;
  color:rgba(198,212,230,.66);
}
.yk-footer__icp,.yk-footer__copy{margin:0}
.yk-footer__copy:only-child{justify-self:start}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1080px){
  .yk-nav__cta{position:static;transform:none}
  .yk-nav__inner{justify-content:space-between;padding-inline:var(--gut)}
  .yk-nav__list{justify-content:center;flex:1}
}
@media (max-width:960px){
  .yk-nav__inner{flex-direction:column;align-items:stretch;justify-content:flex-start;min-height:0;padding-block:8px}
  .yk-nav-toggle{display:inline-flex}
  .yk-nav__list{
    display:none;flex-direction:column;align-items:stretch;gap:2px;
    margin-top:8px;padding:10px 0 6px;
    border-top:1px dashed rgba(111,217,208,.24);
  }
  .yk-nav[data-open] .yk-nav__list{display:flex}
  .yk-nav__link{padding:12px 14px;border-radius:var(--r-soft)}
  .yk-nav__cta{display:none}
  .yk-nav[data-open] .yk-nav__cta{display:inline-flex;width:100%;margin:10px 0 6px}

  .yk-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .yk-span-3,.yk-span-4,.yk-span-5{grid-column:span 6}
  .yk-span-7,.yk-span-8,.yk-span-9,.yk-span-10{grid-column:span 12}
}
@media (max-width:640px){
  body{font-size:16px}
  .yk-masthead__strip-inner{justify-content:flex-start}
  .yk-masthead__note{display:none}
  .yk-brand{gap:10px}
  .yk-brand__seal{width:38px;height:38px;font-size:11px}
  .yk-grid{gap:14px}
  .yk-span-2,.yk-span-3,.yk-span-4,.yk-span-5,.yk-span-6{grid-column:span 12}
  .yk-footer__grid{grid-template-columns:1fr}
  .yk-footer__contact-list{grid-template-columns:1fr}
  .yk-prose{font-size:16px}
}
@media (min-width:961px){
  .yk-nav__list{flex:0 1 auto}
}

/* ---------- 13. 动效与偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .yk-progress{transition:none}
}