/* ==========================================================================
   球速体育入口 · Site Kit 共享样式 /assets/site.css
   场地深绿底 + 荧光青主强调 + 等宽索引 + 切角面板
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0}
ul[class],ol[class]{list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* ---------- 2. Tokens ---------- */
:root{
  --pitch:#061A13;
  --pitch-2:#0A241A;
  --panel:#103528;
  --line:#1E4E3C;
  --cyan:#2FF3C4;
  --cyan-soft:#9CFFE6;
  --orange:#FF5A2B;
  --violet:#6C7BFF;
  --fog:#E9F5EF;
  --fog-dim:#A9C4B9;
  --ink:#04120D;

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

  --maxw:1280px;
  --gutter:24px;
  --header-h:72px;
  --helpbar-h:56px;
  --cut:18px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- 3. 基础排版 ---------- */
body{
  background:var(--pitch);
  color:var(--fog);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  padding-bottom:calc(var(--helpbar-h) + 26px);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2{font-family:var(--font-display);font-weight:900;letter-spacing:-.02em;line-height:1.1}
h1{font-size:clamp(34px,4.6vw,56px)}
h2{font-size:clamp(26px,3.2vw,40px)}
h3{font-size:clamp(20px,2.1vw,28px);line-height:1.32;font-weight:800}
h4{font-size:18px;line-height:1.45;font-weight:800}
small{font-size:13px}
::selection{background:var(--cyan);color:var(--ink)}

/* ---------- 4. 工具类 ---------- */
.qs-container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(18px,4vw,40px)}
.qs-page-top{padding-top:calc(var(--header-h) + 28px)}
.qs-mono{font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--fog-dim)}
.qs-num{font-family:var(--font-display);font-weight:900;font-variant-numeric:tabular-nums;letter-spacing:-.02em;line-height:.95}
.qs-kicker{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--cyan-soft)}
.qs-kicker::before{content:"";width:20px;height:2px;background:var(--cyan)}
.qs-lead{font-size:clamp(17px,1.6vw,19px);line-height:1.72;color:rgba(233,245,239,.88);max-width:34em}
.qs-cut{clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%)}
.qs-rule{height:1px;border:0;margin:0;background:linear-gradient(90deg,var(--line) 0%,rgba(30,78,60,0) 78%)}

/* ---------- 5. 按钮 ---------- */
.qs-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:11px 20px;
  font-size:14.5px;font-weight:700;letter-spacing:.04em;line-height:1.2;
  border:1px solid var(--line);background:transparent;color:var(--fog);
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.qs-btn:active{transform:translateY(1px)}
.qs-btn--primary{
  background:var(--cyan);color:var(--ink);border-color:var(--cyan);
  clip-path:polygon(0 0,calc(100% - 11px) 0,100% 11px,100% 100%,0 100%);
}
.qs-btn--primary:hover{background:var(--cyan-soft);border-color:var(--cyan-soft)}
.qs-btn--primary:focus-visible{outline:3px solid var(--ink);outline-offset:-6px}
.qs-btn--ghost{color:var(--cyan-soft);border-color:rgba(47,243,196,.34)}
.qs-btn--ghost:hover{background:rgba(47,243,196,.1);color:var(--cyan);border-color:var(--cyan)}
.qs-btn--quiet{border-color:transparent;color:var(--fog-dim);padding:8px 10px}
.qs-btn--quiet:hover{color:var(--fog)}

/* ---------- 6. 标签与图例 ---------- */
.qs-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid currentColor;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;line-height:1.6;
}
.qs-tag--cyan{color:var(--cyan);background:rgba(47,243,196,.1)}
.qs-tag--orange{color:var(--orange);background:rgba(255,90,43,.12)}
.qs-tag--violet{color:var(--violet);background:rgba(108,123,255,.14)}
.qs-legend{display:flex;flex-wrap:wrap;gap:8px 20px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--fog-dim)}
.qs-legend__item{display:inline-flex;align-items:center;gap:8px}
.qs-legend__dot{width:9px;height:9px;background:var(--cyan);clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%)}
.qs-legend__dot--orange{background:var(--orange)}
.qs-legend__dot--violet{background:var(--violet)}

/* ---------- 7. 面板 / 网格 / 章节 ---------- */
.qs-panel{position:relative;background:var(--panel);border:1px solid var(--line);padding:clamp(18px,2.4vw,28px)}
.qs-panel--cut{clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%)}
.qs-panel--glow{
  background:
    radial-gradient(130% 110% at 8% 0%,rgba(47,243,196,.18) 0%,rgba(47,243,196,0) 55%),
    radial-gradient(120% 100% at 100% 100%,rgba(108,123,255,.18) 0%,rgba(108,123,255,0) 60%),
    linear-gradient(160deg,var(--panel) 0%,var(--pitch-2) 100%);
}

.qs-grid{display:grid;gap:var(--gutter)}
.qs-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.qs-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.qs-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

.qs-section{position:relative;padding:clamp(56px,7vw,96px) 0}
.qs-section--alt{background:var(--pitch-2)}
.qs-section__head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px 40px;margin-bottom:clamp(24px,3vw,40px)}
.qs-section__title{font-family:var(--font-display);font-size:clamp(26px,3.4vw,40px);line-height:1.14;letter-spacing:-.02em;font-weight:900}
.qs-section__sub{max-width:34em;font-size:16px;color:var(--fog-dim)}

.qs-chapter{display:grid;grid-template-columns:220px minmax(0,1fr);gap:clamp(20px,3vw,48px);align-items:start}
.qs-chapter__index{position:sticky;top:calc(var(--header-h) + 24px);display:flex;flex-direction:column;gap:6px;padding-top:4px}
.qs-chapter__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;color:var(--cyan)}
.qs-chapter__name{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--fog-dim)}
.qs-chapter__index::after{content:"";width:36px;height:2px;margin-top:12px;background:linear-gradient(90deg,var(--cyan),rgba(47,243,196,0))}
.qs-chapter__body{min-width:0}

/* ---------- 8. 面包屑 / 正文域 ---------- */
.qs-breadcrumb{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;color:var(--fog-dim)}
.qs-breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.qs-breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.qs-breadcrumb__item+.qs-breadcrumb__item::before{content:"/";color:rgba(30,78,60,1)}
.qs-breadcrumb a{border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease)}
.qs-breadcrumb a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.qs-breadcrumb [aria-current="page"]{color:var(--cyan-soft)}

.qs-prose{font-size:17px;line-height:1.78;color:rgba(233,245,239,.9)}
.qs-prose>*+*{margin-top:1.1em}
.qs-prose h2,.qs-prose h3{margin-top:1.7em;color:var(--fog)}
.qs-prose p,.qs-prose li{max-width:36em}
.qs-prose ul,.qs-prose ol{padding-left:1.25em}
.qs-prose ul[class],.qs-prose ol[class]{padding-left:1.25em;list-style:disc}
.qs-prose li+li{margin-top:.45em}
.qs-prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}
.qs-prose strong{color:var(--fog);font-weight:700}

/* ---------- 9. 媒体容器（页面阶段放图用） ---------- */
.qs-media{
  position:relative;overflow:hidden;aspect-ratio:16/9;
  border:1px solid var(--line);
  background:
    radial-gradient(120% 90% at 12% 8%,rgba(47,243,196,.16) 0%,rgba(47,243,196,0) 56%),
    radial-gradient(110% 90% at 88% 92%,rgba(108,123,255,.16) 0%,rgba(108,123,255,0) 60%),
    linear-gradient(160deg,var(--panel) 0%,var(--pitch-2) 100%);
}
.qs-media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(105deg,rgba(47,243,196,.09) 0 1px,transparent 1px 28px);
}
.qs-media--wide{aspect-ratio:21/9}
.qs-media--square{aspect-ratio:1/1}
.qs-media--tall{aspect-ratio:4/5}
.qs-media__img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.qs-media__cap{
  position:absolute;left:0;bottom:0;z-index:2;padding:8px 12px;
  background:rgba(4,18,13,.74);font-family:var(--font-mono);
  font-size:11px;letter-spacing:.12em;color:var(--cyan-soft);
}

/* ---------- 10. Header ---------- */
.qs-header{
  position:fixed;top:0;left:0;right:0;z-index:200;
  color:var(--fog);
  background:linear-gradient(180deg,rgba(4,18,13,.88) 0%,rgba(4,18,13,.55) 58%,rgba(4,18,13,0) 100%);
  transition:background-color .3s var(--ease),box-shadow .3s var(--ease);
}
.qs-header[data-state="solid"]{
  background:rgba(6,26,19,.975);
  box-shadow:0 1px 0 var(--line),0 18px 44px -30px #000;
}
.qs-progress{position:absolute;left:0;right:0;top:0;height:2px;z-index:3;background:rgba(30,78,60,.42)}
.qs-progress__bar{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;background:var(--cyan);box-shadow:0 0 10px rgba(47,243,196,.6)}

.qs-skip{
  position:absolute;left:16px;top:10px;z-index:6;
  padding:9px 16px;background:var(--cyan);color:var(--ink);
  font-size:14px;font-weight:700;letter-spacing:.04em;
  transform:translateY(-240%);transition:transform .18s var(--ease);
}
.qs-skip:focus,.qs-skip:focus-visible{transform:translateY(0);outline:3px solid var(--ink);outline-offset:2px}

.qs-header__inner{
  display:flex;align-items:center;gap:clamp(12px,2vw,28px);
  width:100%;max-width:var(--maxw);margin-inline:auto;
  height:var(--header-h);padding:0 clamp(16px,3vw,32px);
}

.qs-brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;min-height:44px}
.qs-brand__mark{
  position:relative;flex:0 0 auto;width:34px;height:34px;
  background:linear-gradient(142deg,var(--cyan) 0%,#1ec9a4 52%,var(--panel) 100%);
  clip-path:polygon(0 0,100% 0,100% 62%,62% 100%,0 100%);
}
.qs-brand__mark::after{
  content:"";position:absolute;left:7px;right:7px;bottom:8px;height:2px;
  background:rgba(4,18,13,.55);
}
.qs-brand__text{display:flex;flex-direction:column;line-height:1.18}
.qs-brand__name{font-size:16px;font-weight:800;letter-spacing:.09em;color:var(--fog)}
.qs-brand__sub{font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:var(--fog-dim)}

.qs-nav{display:flex;align-items:center;margin-left:auto}
.qs-nav__list{display:flex;align-items:center;gap:2px}
.qs-nav__item{display:block}
.qs-nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:9px 12px;font-size:14.5px;color:var(--fog-dim);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.qs-nav__idx{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;color:rgba(156,255,230,.4);transition:color .18s var(--ease)}
.qs-nav__link:hover{color:var(--fog);background:rgba(47,243,196,.07)}
.qs-nav__link[aria-current="page"]{color:var(--cyan)}
.qs-nav__link[aria-current="page"] .qs-nav__idx{color:var(--cyan)}
.qs-nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:12px;right:12px;bottom:3px;height:2px;
  background:var(--cyan);box-shadow:0 0 8px rgba(47,243,196,.7);
}
.qs-nav__cta{display:none}
.qs-nav__note{display:none;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--fog-dim);margin-top:22px;word-break:break-all}

.qs-header__actions{display:flex;align-items:center;gap:10px;flex:0 0 auto;margin-left:8px}
.qs-header__cta{white-space:nowrap}

.qs-burger{
  display:none;align-items:center;gap:8px;min-height:44px;padding:8px 12px;
  border:1px solid var(--line);color:var(--fog);
  font-size:13px;letter-spacing:.08em;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.qs-burger:hover{border-color:var(--cyan);color:var(--cyan)}
.qs-burger__box{display:inline-flex;flex-direction:column;justify-content:center;gap:5px;width:18px;height:14px}
.qs-burger__line{display:block;height:2px;width:100%;background:currentColor;transition:transform .22s var(--ease)}
.qs-burger[aria-expanded="true"] .qs-burger__line:first-child{transform:translateY(3.5px) rotate(45deg)}
.qs-burger[aria-expanded="true"] .qs-burger__line:last-child{transform:translateY(-3.5px) rotate(-45deg)}
.qs-burger__label{line-height:1}

/* ---------- 11. 悬浮入口舱 ---------- */
.qs-dock{
  position:fixed;right:10px;top:50%;transform:translateY(-50%);z-index:120;
  display:none;flex-direction:column;align-items:center;gap:8px;
  padding:12px 6px;background:rgba(10,36,26,.86);
  border:1px solid var(--line);border-right:0;
}
.qs-dock__title{font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:var(--fog-dim);writing-mode:vertical-rl}
.qs-dock__list{display:flex;flex-direction:column;gap:4px}
.qs-dock__link{
  position:relative;display:flex;align-items:center;justify-content:center;
  width:34px;height:34px;border:1px solid transparent;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--fog-dim);
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.qs-dock__num{position:relative;z-index:1}
.qs-dock__text{
  position:absolute;right:calc(100% + 10px);top:50%;transform:translate(6px,-50%);
  padding:4px 10px;white-space:nowrap;
  background:var(--pitch-2);border:1px solid var(--line);color:var(--fog);
  font-family:var(--font-body);font-size:12.5px;letter-spacing:.06em;
  opacity:0;pointer-events:none;
  transition:opacity .18s var(--ease),transform .18s var(--ease);
}
.qs-dock__link:hover,.qs-dock__link:focus-visible{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}
.qs-dock__link:hover .qs-dock__text,.qs-dock__link:focus-visible .qs-dock__text{opacity:1;transform:translate(0,-50%)}
.qs-dock__link[aria-current="page"]{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}
.qs-dock__section{
  max-height:110px;overflow:hidden;padding-top:4px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;
  color:var(--cyan);writing-mode:vertical-rl;
}

/* ---------- 12. Footer ---------- */
.qs-footer{
  position:relative;overflow:hidden;margin-top:clamp(56px,9vw,120px);
  background:var(--pitch-2);border-top:1px solid var(--line);
}
.qs-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.55;
  background-image:repeating-linear-gradient(105deg,rgba(47,243,196,.05) 0 1px,transparent 1px 46px);
}
.qs-footer__inner{
  position:relative;z-index:1;
  max-width:var(--maxw);margin-inline:auto;
  padding:clamp(40px,6vw,72px) clamp(18px,4vw,40px) 40px;
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.35fr);gap:clamp(28px,4vw,64px);
}
.qs-footer__brand{min-width:0}
.qs-footer__wordmark{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(28px,4vw,44px);line-height:1.05;letter-spacing:-.02em;color:var(--fog);
}
.qs-footer__accent{color:var(--cyan)}
.qs-footer__tagline{
  margin-top:10px;font-family:var(--font-mono);font-size:11.5px;
  letter-spacing:.18em;text-transform:uppercase;color:var(--fog-dim);
}
.qs-footer__intro{margin-top:16px;max-width:24em;font-size:15px;line-height:1.7;color:var(--fog-dim)}
.qs-footer__cta{margin-top:22px}

.qs-footer__cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,32px)}
.qs-footer__col{min-width:0}
.qs-footer__col-title{
  font-family:var(--font-mono);font-size:11px;font-weight:400;
  letter-spacing:.22em;color:var(--cyan-soft);margin-bottom:14px;
}
.qs-footer__list{display:flex;flex-direction:column;gap:2px}
.qs-footer__link{
  display:inline-block;padding:5px 0;font-size:15px;color:var(--fog-dim);
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.qs-footer__link:hover{color:var(--cyan);transform:translateX(3px)}

.qs-footer__contact{
  grid-column:1/-1;margin-top:8px;
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px 32px;
  padding:clamp(18px,2.4vw,26px);background:var(--panel);border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - 18px) 0,100% 18px,100% 100%,0 100%);
}
.qs-footer__contact-item{min-width:0}
.qs-footer__contact-k{
  display:block;margin-bottom:5px;font-family:var(--font-mono);
  font-size:10.5px;letter-spacing:.18em;color:var(--cyan-soft);
}
.qs-footer__contact-v{display:block;font-size:14.5px;line-height:1.6;color:var(--fog);word-break:break-word}

.qs-footer__legal{
  position:relative;z-index:1;
  max-width:var(--maxw);margin-inline:auto;
  padding:18px clamp(18px,4vw,40px) 26px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--fog-dim);
}
.qs-footer__legal-line{white-space:nowrap}
.qs-footer__closing{
  margin-left:auto;max-width:34em;
  font-family:var(--font-body);font-size:13px;letter-spacing:0;line-height:1.6;color:var(--fog-dim);
}

/* ---------- 13. 底部帮助入口带 / 返回顶部 ---------- */
.qs-helpbar{
  position:fixed;left:0;right:0;bottom:0;z-index:180;
  background:linear-gradient(90deg,rgba(16,53,40,.98) 0%,rgba(8,30,22,.98) 58%,rgba(10,36,26,.98) 100%);
  border-top:1px solid var(--line);
  box-shadow:0 -20px 44px -32px #000;
}
.qs-helpbar__inner{
  display:flex;align-items:center;gap:16px;
  min-height:var(--helpbar-h);max-width:var(--maxw);margin-inline:auto;
  padding:8px clamp(14px,3vw,32px);
}
.qs-helpbar__text{
  display:flex;align-items:center;gap:10px;min-width:0;
  overflow:hidden;white-space:nowrap;text-overflow:ellipsis;
  font-size:13.5px;color:var(--fog-dim);
}
.qs-helpbar__k{
  flex:0 0 auto;padding:3px 7px;background:var(--cyan);color:var(--ink);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;
}
.qs-helpbar__actions{display:flex;align-items:center;gap:8px;margin-left:auto;flex:0 0 auto}
.qs-helpbar__btn{min-height:38px;padding:8px 14px;font-size:13px}
.qs-helpbar__toggle{
  min-height:38px;padding:8px 10px;color:var(--fog-dim);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  border:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease);
}
.qs-helpbar__toggle:hover{color:var(--cyan);border-color:var(--line)}
.qs-helpbar[data-collapsed] .qs-helpbar__text{display:none}

.qs-totop{
  position:fixed;right:18px;bottom:calc(var(--helpbar-h) + 16px);z-index:170;
  display:inline-flex;align-items:center;justify-content:center;
  width:44px;height:44px;
  background:rgba(10,36,26,.95);border:1px solid var(--line);color:var(--cyan);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease),background-color .2s var(--ease);
  clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,0 100%);
}
.qs-totop[data-visible]{opacity:1;visibility:visible;transform:none}
.qs-totop:hover{background:var(--cyan);color:var(--ink)}
.qs-totop:focus-visible{outline:3px solid var(--cyan-soft);outline-offset:-6px}
.qs-totop__arrow{font-size:16px;line-height:1}

/* ---------- 14. 动效协议 ---------- */
.qs-anim [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .26s var(--ease),transform .26s var(--ease);
}
.qs-anim [data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 15. 响应式 ---------- */
@media (min-width:1360px){
  .qs-dock{display:flex}
}

@media (max-width:1279px){
  .qs-nav__link{padding:9px 10px;font-size:14px}
}

@media (max-width:1100px){
  .qs-header__cta{display:none}
}

@media (max-width:1023px){
  .qs-burger{display:inline-flex}
  .qs-header__actions{position:relative;z-index:210}
  .qs-nav{
    position:fixed;top:0;right:0;bottom:0;z-index:190;
    width:min(86vw,360px);margin:0;
    display:flex;flex-direction:column;align-items:stretch;
    padding:calc(var(--header-h) + 18px) 22px 32px;
    background:linear-gradient(180deg,#0B2A1F 0%,var(--pitch-2) 100%);
    border-left:1px solid var(--line);
    box-shadow:-28px 0 64px -34px #000;
    transform:translateX(102%);visibility:hidden;overflow-y:auto;
    transition:transform .28s var(--ease),visibility .28s var(--ease);
  }
  .qs-nav[data-open]{transform:translateX(0);visibility:visible}
  .qs-nav__list{flex-direction:column;align-items:stretch;width:100%;gap:0}
  .qs-nav__link{
    display:flex;justify-content:flex-start;gap:12px;
    padding:16px 4px;font-size:17px;
    border-bottom:1px solid var(--line);
  }
  .qs-nav__idx{font-size:11px;color:rgba(156,255,230,.55)}
  .qs-nav__link[aria-current="page"]::after{
    left:auto;right:2px;top:50%;bottom:auto;
    width:7px;height:7px;transform:translateY(-50%);
    box-shadow:0 0 10px rgba(47,243,196,.8);
  }
  .qs-nav__cta{display:inline-flex;margin-top:24px;align-self:flex-start}
  .qs-nav__note{display:block}
}

@media (max-width:900px){
  .qs-grid--3,.qs-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .qs-footer__inner{grid-template-columns:minmax(0,1fr)}
  .qs-footer__contact{grid-template-columns:repeat(2,minmax(0,1fr))}
  .qs-chapter{grid-template-columns:minmax(0,1fr)}
  .qs-chapter__index{position:static;flex-direction:row;align-items:center;gap:12px;padding-top:0}
  .qs-chapter__index::after{display:none}
}

@media (max-width:720px){
  :root{--header-h:64px;--helpbar-h:48px}
  body{font-size:16px}
  .qs-brand__mark{width:30px;height:30px}
  .qs-brand__name{font-size:15px}
  .qs-helpbar__inner{gap:10px;padding:6px 14px}
  .qs-helpbar__text{font-size:12.5px}
  .qs-helpbar__btn{min-height:34px;padding:6px 10px;font-size:12.5px}
  .qs-helpbar__toggle{min-height:34px;padding:6px 6px}
  .qs-footer__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .qs-footer__contact{grid-template-columns:minmax(0,1fr)}
  .qs-footer__closing{margin-left:0}
  .qs-totop{right:12px;width:40px;height:40px}
}

@media (max-width:640px){
  .qs-brand__sub{display:none}
  .qs-grid--2{grid-template-columns:minmax(0,1fr)}
  .qs-section__head{flex-direction:column;align-items:flex-start}
}

@media (max-width:600px){
  .qs-grid--3,.qs-grid--4{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:560px){
  .qs-helpbar__actions .qs-btn--ghost{display:none}
  .qs-footer__legal{font-size:11px;letter-spacing:.06em}
}

/* ---------- 16. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .qs-anim [data-reveal]{opacity:1;transform:none}
  .qs-nav{transition:none}
  .qs-progress__bar{box-shadow:none}
}