/* ============================================================
   竞博中心 · /assets/site.css
   共享外壳：重置 / 变量 / 中文排版 / 刊头 / 页脚 / 通用组件
   ============================================================ */

:root{
  --ink:#0B1B2B;
  --ink-2:#102A43;
  --ink-3:#0D2337;
  --line:#2A4A6B;
  --line-soft:rgba(42,74,107,.55);
  --orange:#FF6A2A;
  --cyan:#19D3C5;
  --white:#F6F3EA;
  --silver:#A8B6C8;
  --teal:#0F5C63;
  --amber:#FFB020;
  --mist:#D9E6F2;
  --font-display:"Barlow Condensed","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --radius-lg:22px;
  --radius-md:14px;
  --radius-pill:999px;
  --shell-w:1240px;
  --header-h:118px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}

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

body{
  margin:0;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  color:var(--white);
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(42,74,107,.16) 1px,transparent 1px),
    linear-gradient(90deg,rgba(42,74,107,.16) 1px,transparent 1px),
    radial-gradient(120% 80% at 84% -12%,rgba(25,211,197,.10),transparent 62%),
    radial-gradient(90% 70% at 0% 0%,rgba(255,106,42,.08),transparent 55%);
  background-size:64px 64px,64px 64px,100% 100%,100% 100%;
  background-attachment:fixed;
  overflow-x:hidden;
}

main{display:block}

h1,h2,h3,h4{
  margin:0 0 .5em;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.14;
  letter-spacing:.01em;
  color:var(--white);
}
h1{font-size:clamp(38px,6vw,66px)}
h2{font-size:clamp(26px,3.8vw,42px)}
h3{font-size:clamp(20px,2.4vw,26px)}

p{margin:0 0 1em}
a{color:var(--cyan);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--white)}
img{max-width:100%;height:auto;display:block}
ul,ol{padding-left:1.2em}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}

/* ---------- 无障碍与工具类 ---------- */
.skip-link{
  position:fixed;top:8px;left:8px;z-index:200;
  transform:translateY(-180%);
  background:var(--orange);color:#08182a;font-weight:700;
  padding:10px 18px;border-radius:var(--radius-pill);
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:#08182a}

.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;
}

.mono,.u-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

.container{width:min(var(--shell-w),100% - 40px);margin-inline:auto}
.container--narrow{width:min(880px,100% - 40px);margin-inline:auto}

/* ---------- 刊头 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:linear-gradient(180deg,rgba(11,27,43,.98),rgba(16,42,67,.94));
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,var(--orange) 18%,var(--cyan) 78%,transparent);
  opacity:.6;pointer-events:none;
}

.masthead{max-width:var(--shell-w);margin:0 auto;padding:14px 20px 0}
.masthead__grid{
  display:grid;grid-template-columns:1fr auto 1fr;
  align-items:center;gap:16px;
}
.masthead__coord{
  margin:0;font-family:var(--font-mono);font-size:11.5px;
  letter-spacing:.16em;text-transform:uppercase;color:var(--silver);
}
.brand{
  display:flex;flex-direction:column;align-items:center;gap:3px;
  text-decoration:none;padding:2px 10px;position:relative;
}
.brand::before{
  content:"";position:absolute;top:-2px;left:50%;transform:translateX(-50%);
  width:34px;height:2px;background:var(--orange);border-radius:2px;
}
.brand__mark{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(23px,3vw,31px);letter-spacing:.18em;
  color:var(--white);line-height:1.1;
}
.brand__sub{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.34em;
  color:var(--cyan);text-transform:uppercase;
}
.masthead__actions{display:flex;justify-content:flex-end;align-items:center;gap:10px}
.masthead__quick{
  display:inline-flex;align-items:center;
  padding:8px 16px;border-radius:var(--radius-pill);
  border:1px solid rgba(25,211,197,.5);
  color:var(--cyan);font-size:13.5px;font-weight:600;
  background:rgba(15,92,99,.22);
  transition:background .2s var(--ease),color .2s,border-color .2s;
}
.masthead__quick:hover{background:rgba(25,211,197,.16);color:var(--white);border-color:var(--cyan)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 15px;border-radius:var(--radius-pill);
  border:1px solid var(--line-soft);background:rgba(16,42,67,.72);
  color:var(--white);font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.16em;cursor:pointer;
}
.nav-toggle__bars{position:relative;display:inline-block;width:16px;height:9px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:1.5px;
  background:var(--cyan);border-radius:2px;
  transition:transform .22s var(--ease);
}
.nav-toggle__bars::before{top:0;box-shadow:0 3.75px 0 var(--cyan)}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(3.75px) rotate(45deg);box-shadow:none}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-3.75px) rotate(-45deg)}

.primary-nav{border-top:1px solid var(--line-soft);margin-top:12px}
.nav-list{
  display:flex;flex-wrap:wrap;justify-content:center;gap:2px;
  list-style:none;margin:0 auto;padding:0 20px;max-width:var(--shell-w);
}
.nav-list__item{display:flex}
.nav-link{
  display:inline-flex;align-items:baseline;gap:7px;
  padding:12px 15px;border-bottom:2px solid transparent;
  color:var(--silver);font-size:15px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.nav-link__idx{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:#5D7996;transition:color .2s var(--ease);
}
.nav-link:hover{color:var(--white)}
.nav-link:hover .nav-link__idx{color:var(--cyan)}
.nav-link[aria-current="page"]{color:var(--white);border-bottom-color:var(--orange)}
.nav-link[aria-current="page"] .nav-link__idx{color:var(--orange)}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(44px,7vw,92px);
  background:linear-gradient(180deg,rgba(16,42,67,.86),#071320 66%);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:2px;
  background:linear-gradient(90deg,var(--orange),var(--cyan) 52%,transparent);
  opacity:.8;
}
.footer__grid{
  display:grid;grid-template-columns:1.5fr 1fr 1.5fr;
  gap:clamp(24px,4vw,48px);
  padding:clamp(40px,6vw,68px) 0 clamp(26px,4vw,42px);
}
.footer__brand{display:flex;flex-direction:column;align-items:flex-start;gap:10px}
.footer__mark{
  font-family:var(--font-display);font-weight:800;
  font-size:26px;letter-spacing:.18em;color:var(--white);
}
.footer__tag{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;
  color:var(--cyan);text-transform:uppercase;
}
.footer__brief{
  margin:0;max-width:34ch;color:var(--silver);
  font-size:14.5px;line-height:1.75;
}
.footer__cta{margin-top:6px}
.footer__col{min-width:0}
.footer__title{
  margin:0 0 14px;font-family:var(--font-mono);font-weight:500;
  font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--cyan);
}
.footer__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}
.footer__link{display:inline-flex;align-items:center;gap:9px;color:var(--silver);font-size:15px}
.footer__link::before{
  content:"";width:10px;height:1px;background:var(--line);
  transition:width .22s var(--ease),background .22s var(--ease);
}
.footer__link:hover{color:var(--white)}
.footer__link:hover::before{width:20px;background:var(--orange)}

.contact-row{
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:10px;
  padding:9px 0;border-bottom:1px dashed rgba(42,74,107,.6);
}
.contact-row__label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--silver);white-space:nowrap;
}
.contact-row__value{color:var(--white);font-size:14.5px;word-break:break-word}
.copy-btn{
  border:1px solid var(--line-soft);background:rgba(11,27,43,.6);
  color:var(--silver);font-family:var(--font-mono);font-size:11px;
  letter-spacing:.08em;padding:4px 10px;border-radius:var(--radius-pill);
  cursor:pointer;transition:color .2s,border-color .2s,background .2s;
}
.copy-btn:hover{color:var(--cyan);border-color:rgba(25,211,197,.5)}
.copy-btn[data-copied="true"]{
  color:var(--amber);border-color:rgba(255,176,32,.55);background:rgba(255,176,32,.1);
}
.footer__note{
  margin:16px 0 0;padding-left:12px;border-left:2px solid var(--cyan);
  font-size:12.5px;line-height:1.7;color:var(--silver);
}
.footer__bottom{
  display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center;
  padding:18px 0 30px;border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--silver);
}
.footer__copyright{margin:0}
.footer__legal{display:flex;flex-wrap:wrap;gap:18px;list-style:none;margin:0;padding:0}
.footer__legal-link{color:var(--silver)}
.footer__legal-link:hover{color:var(--orange)}

/* ---------- 页面头与章节 ---------- */
.page-head{padding:clamp(28px,4vw,52px) 0 0}
.page-head__grid{
  display:grid;grid-template-columns:minmax(0,1fr) auto;
  gap:24px;align-items:end;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;margin-bottom:14px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--orange)}

.section{position:relative;padding:clamp(44px,6.5vw,88px) 0}
.section--tight{padding:clamp(26px,4vw,46px) 0}
.section--panel{
  background:linear-gradient(180deg,rgba(16,42,67,.55),rgba(11,27,43,0));
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line-soft);
}
.section-head{
  display:flex;align-items:flex-start;gap:clamp(14px,2.5vw,28px);
  margin-bottom:clamp(24px,3.5vw,42px);
}
.section-head__num{
  flex:0 0 auto;padding-top:.75em;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.14em;color:var(--orange);
}
.section-title{margin:0;font-size:clamp(26px,3.6vw,42px)}
.section-sub{margin:.6em 0 0;max-width:56ch;color:var(--silver);font-size:15.5px;line-height:1.75}
.section-note{
  flex:0 0 auto;margin-left:auto;padding-top:4px;
  writing-mode:vertical-rl;font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.3em;color:var(--silver);
}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.2vw,24px)}
.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-12{grid-column:span 12}

/* ---------- 卡片 ---------- */
.card{
  position:relative;
  background:linear-gradient(155deg,rgba(16,42,67,.95),rgba(13,35,55,.86));
  border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:clamp(18px,2.4vw,26px);
  transition:transform .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease);
}
.card:hover{
  transform:translateY(-3px);
  border-color:rgba(25,211,197,.45);
  box-shadow:0 0 0 1px rgba(25,211,197,.14),0 22px 46px -30px rgba(25,211,197,.7);
}
.card__top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}
.card__index{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--orange)}
.card__title{margin:0 0 .45em;font-size:clamp(19px,2.2vw,24px)}
.card__body{margin:0;color:var(--silver);font-size:15px;line-height:1.78}
.card__meta{margin-top:14px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--silver)}
.card--accent::before{
  content:"";position:absolute;top:18px;right:18px;
  width:9px;height:9px;border-radius:50%;background:var(--orange);
  box-shadow:0 0 0 4px rgba(255,106,42,.16);
}

/* ---------- 标签 ---------- */
.tag-list{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--radius-pill);
  border:1px solid rgba(25,211,197,.35);background:rgba(25,211,197,.08);
  color:var(--cyan);font-family:var(--font-mono);
  font-size:12px;letter-spacing:.06em;white-space:nowrap;
}
.tag--orange{border-color:rgba(255,106,42,.42);background:rgba(255,106,42,.1);color:var(--orange)}
.tag--plain{border-color:var(--line);background:rgba(16,42,67,.6);color:var(--silver)}

/* ---------- 索引列表 ---------- */
.index-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.index-list__item{
  display:grid;grid-template-columns:64px minmax(0,1fr) auto;gap:16px;
  align-items:baseline;padding:16px 0;
  border-bottom:1px dashed rgba(42,74,107,.7);
}
.index-list__num{font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;color:var(--orange)}
.index-list__title{color:var(--white);font-weight:500;font-size:16.5px}

/* ---------- 注释与正文 ---------- */
.note{
  margin:18px 0;padding:12px 0 12px 14px;
  border-left:2px solid var(--cyan);
  color:var(--silver);font-size:13.5px;line-height:1.75;
}
.note--warn{border-left-color:var(--amber)}

.prose{font-size:17px;line-height:1.85;color:#DFE6EF}
.prose > * + *{margin-top:1em}
.prose h2{margin-top:1.6em;font-size:clamp(24px,3vw,32px)}
.prose h3{margin-top:1.4em}
.prose ul,.prose ol{padding-left:1.15em}
.prose li{margin:.35em 0}
.prose strong{color:var(--white)}
.prose a{border-bottom:1px solid rgba(25,211,197,.5)}

/* ---------- 图片容器基础规则 ---------- */
.figure{
  position:relative;margin:0;overflow:hidden;
  border:1px solid var(--line);border-radius:var(--radius-lg);
  background:linear-gradient(150deg,rgba(16,42,67,.9),rgba(11,27,43,.95));
}
.figure__frame{
  position:relative;display:block;width:100%;aspect-ratio:16 / 10;
  background-image:
    linear-gradient(rgba(42,74,107,.35) 1px,transparent 1px),
    linear-gradient(90deg,rgba(42,74,107,.35) 1px,transparent 1px);
  background-size:32px 32px;
}
.figure__frame img{width:100%;height:100%;object-fit:cover}
.figure__tag{
  position:absolute;top:12px;left:12px;z-index:2;
  padding:4px 11px;border-radius:var(--radius-pill);
  background:rgba(11,27,43,.82);border:1px solid rgba(25,211,197,.4);
  color:var(--cyan);font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
}
.figure__caption{
  padding:12px 16px;border-top:1px dashed var(--line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--silver);
}
.figure--wide .figure__frame{aspect-ratio:21 / 9}
.figure--tall .figure__frame{aspect-ratio:3 / 4}

/* ---------- 章节目录 ---------- */
.toc{
  position:sticky;top:calc(var(--header-h) + 14px);
  padding-left:16px;border-left:1px solid var(--line);
}
.toc__title{
  margin:0 0 12px;font-family:var(--font-mono);font-weight:500;
  font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--silver);
}
.toc__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.toc-link{
  position:relative;display:block;padding-left:12px;
  color:var(--silver);font-size:14px;transition:color .2s var(--ease);
}
.toc-link::before{
  content:"";position:absolute;left:0;top:.65em;width:0;height:2px;
  background:var(--orange);transition:width .22s var(--ease);
}
.toc-link:hover{color:var(--white)}
.toc-link[aria-current="true"]{color:var(--white)}
.toc-link[aria-current="true"]::before{width:8px}

/* ---------- 按钮与面包屑 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;border-radius:var(--radius-pill);
  border:1px solid transparent;font-family:var(--font-body);
  font-size:15px;font-weight:700;line-height:1.2;cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),
             border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--orange);color:#08182a}
.btn--primary:hover{background:#FF8147;color:#08182a}
.btn--ghost{border-color:rgba(25,211,197,.55);color:var(--cyan);background:transparent}
.btn--ghost:hover{background:rgba(25,211,197,.12);color:var(--white);border-color:var(--cyan)}
.btn--quiet{border-color:var(--line);background:rgba(16,42,67,.6);color:var(--white)}
.btn--quiet:hover{border-color:var(--orange);color:var(--white)}
.btn--sm{padding:8px 16px;font-size:13.5px}

.breadcrumb{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em}
.breadcrumb__list{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.breadcrumb__item{color:var(--silver)}
.breadcrumb__item + .breadcrumb__item::before{content:"/";margin-right:8px;color:var(--line)}
.breadcrumb__item[aria-current="page"]{color:var(--white)}
.breadcrumb__link{color:var(--silver)}
.breadcrumb__link:hover{color:var(--cyan)}

/* ---------- 脚本生成组件 ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:120;
  transform:scaleX(0);transform-origin:0 50%;pointer-events:none;
  background:linear-gradient(90deg,var(--orange),var(--cyan));
}
.to-top{
  position:fixed;right:20px;bottom:22px;z-index:110;
  display:inline-flex;align-items:center;justify-content:center;
  width:46px;height:46px;border-radius:50%;cursor:pointer;
  border:1px solid rgba(25,211,197,.55);background:rgba(11,27,43,.85);
  color:var(--cyan);font-size:16px;line-height:1;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .25s var(--ease),transform .25s var(--ease),
             visibility .25s linear,background .2s,border-color .2s,color .2s;
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--cyan);color:var(--white);background:rgba(15,92,99,.55)}

/* ---------- 显现 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .span-3,.span-4,.span-5{grid-column:span 3}
  .span-6,.span-7,.span-8,.span-12{grid-column:span 6}
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer__brand{grid-column:1 / -1}
}

@media (max-width:900px){
  :root{--header-h:100px}
  body{background-attachment:scroll}
  .masthead{padding:12px 16px 0}
  .masthead__grid{grid-template-columns:auto 1fr auto;gap:10px}
  .masthead__coord{display:none}
  .brand{align-items:flex-start;padding-left:0}
  .brand::before{left:0;transform:none}
  .nav-toggle{display:inline-flex}
  .masthead__quick{display:none}
  .primary-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;max-height:calc(100vh - 110px);overflow-y:auto;
    margin-top:0;
    background:linear-gradient(180deg,var(--ink-2),var(--ink));
    border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  }
  .primary-nav[data-open]{display:block;animation:navDrop .22s var(--ease) both}
  .nav-list{flex-direction:column;align-items:stretch;padding:10px 18px 20px;gap:0}
  .nav-list__item{border-bottom:1px dashed rgba(42,74,107,.7)}
  .nav-link{
    width:100%;justify-content:flex-start;gap:12px;
    padding:14px 4px;border-bottom:none;border-left:2px solid transparent;
    font-size:16px;
  }
  .nav-link__idx{color:var(--silver)}
  .nav-link[aria-current="page"]{
    border-left-color:var(--orange);border-bottom-color:transparent;padding-left:12px;
  }
  .section-head{flex-wrap:wrap}
  .section-note{
    writing-mode:horizontal-tb;margin-left:0;
    letter-spacing:.28em;font-size:11px;
  }
  .toc{position:static;border-left:none;border-top:1px solid var(--line);padding-left:0;padding-top:14px}
}

@keyframes navDrop{
  from{opacity:0;transform:translateY(-6px)}
  to{opacity:1;transform:none}
}

@media (max-width:640px){
  body{font-size:16px}
  .container,.container--narrow{width:min(var(--shell-w),100% - 32px)}
  .grid--12{grid-template-columns:repeat(2,minmax(0,1fr))}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 2}
  .footer__grid{grid-template-columns:1fr}
  .footer__brand{grid-column:auto}
  .contact-row{grid-template-columns:1fr auto;row-gap:2px}
  .contact-row__label{grid-column:1 / -1}
  .index-list__item{grid-template-columns:48px minmax(0,1fr);row-gap:4px}
  .page-head__grid{grid-template-columns:1fr}
  .to-top{right:14px;bottom:16px;width:42px;height:42px}
}

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