/* ============================================================
   九博体育会馆 · 共享样式表 /assets/site.css
   气质：夜晚数据看台 × 旧版印刷物叠印
   ============================================================ */

/* ---------- 01 设计变量 ---------- */
:root{
  --ink-900:#0B1A2B;
  --ink-800:#12283F;
  --ink-700:#162F49;

  --cyan:#35E0D6;
  --amber:#F2A03D;
  --brass:#8A5A22;
  --wine:#6E2A3C;
  --indigo:#3B2E6E;

  --paper:#E8EDF2;
  --mist:#9FB0C0;
  --news:#F4F1EA;
  --line:#23405C;

  --glass:rgba(18,40,63,.58);
  --glass-deep:rgba(11,26,43,.88);

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,"Noto Sans Mono CJK SC","Courier New",monospace;

  --page:min(1320px,92vw);
  --r-xl:26px;
  --r-lg:18px;
  --r-md:12px;
  --r-sm:5px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 02 reset ---------- */
*,*::before,*::after{box-sizing:border-box}

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  background:var(--ink-900);
}

body{
  margin:0;
  background:transparent;
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:clamp(15px,.55vw + .82rem,17px);
  line-height:1.85;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

/* 数据屏颗粒 + 冷光晕 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(232,237,242,.022) 0 1px,transparent 1px 3px),
    repeating-linear-gradient(90deg,rgba(53,224,214,.032) 0 1px,transparent 1px 96px),
    radial-gradient(120% 78% at 82% -12%,rgba(53,224,214,.10),transparent 58%),
    radial-gradient(96% 70% at -6% 104%,rgba(59,46,110,.26),transparent 62%);
}

img,svg,video{display:block;max-width:100%}
img{height:auto}

h1,h2,h3,h4,h5{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.16;
  letter-spacing:-.012em;
  color:var(--paper);
}

p{margin:0 0 1.05em}
ul,ol{margin:0 0 1.05em;padding-left:1.15em}

a{color:var(--cyan);text-decoration:none}
a:hover{color:var(--paper)}

button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}

::selection{background:var(--amber);color:#1B1206}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:4px;
}

:target{scroll-margin-top:130px}

/* ---------- 03 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:12px;
  left:50%;
  z-index:400;
  padding:10px 20px;
  border-radius:999px;
  background:var(--cyan);
  color:var(--ink-900);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  transform:translate(-50%,-180%);
  transition:transform .24s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translate(-50%,0);color:var(--ink-900);outline-offset:4px}

/* ---------- 04 布局容器与章节 ---------- */
.container{width:var(--page);margin-inline:auto}
.container--narrow{width:min(760px,92vw)}
.container--wide{width:min(1480px,94vw)}

.section{padding-block:clamp(46px,6.4vw,104px)}
.section--ruled{border-top:1px solid rgba(35,64,92,.62)}
.section--tight{padding-block:clamp(28px,3.6vw,56px)}

.section-head{
  display:grid;
  gap:14px;
  max-width:62ch;
  margin-bottom:clamp(24px,3.6vw,46px);
}

.section-index{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.34em;
  text-transform:uppercase;
  color:var(--amber);
}

.section-title{font-size:clamp(27px,3.9vw,50px)}
.section-lead{margin:0;color:var(--mist);font-size:1.02rem;line-height:1.9}

.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--mist);
}

.lede{font-size:clamp(16px,.8vw + .92rem,20px);line-height:1.9;color:var(--paper);margin:0}
.muted{color:var(--mist)}

.rule{
  height:1px;
  margin:clamp(20px,3vw,34px) 0;
  border:0;
  background:linear-gradient(90deg,rgba(35,64,92,.95),rgba(35,64,92,0));
}

.color-band{
  height:3px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--wine),var(--indigo),var(--cyan),var(--amber));
}

/* ---------- 05 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.2vw,32px)}

.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}

.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-9{grid-column:span 9}

/* ---------- 06 面板与标签 ---------- */
.panel{
  position:relative;
  padding:clamp(20px,2.5vw,34px);
  border-radius:var(--r-lg);
  border:1px solid rgba(35,64,92,.92);
  background:var(--glass);
  backdrop-filter:blur(12px) saturate(125%);
  -webkit-backdrop-filter:blur(12px) saturate(125%);
}

.panel--news{
  border-radius:var(--r-sm);
  border-color:rgba(11,26,43,.16);
  background:var(--news);
  color:#17232F;
  backdrop-filter:none;
  box-shadow:0 30px 70px -46px rgba(0,0,0,.98);
}
.panel--news h2,
.panel--news h3,
.panel--news h4{color:#101C27}
.panel--news p{color:#3B4B58}
.panel--news a{color:#1C5E77}
.panel--news a:hover{color:#0E1B25}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.4em;
  padding:4px 10px;
  border-radius:3px;
  border:1px solid rgba(53,224,214,.45);
  background:rgba(53,224,214,.08);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  white-space:nowrap;
}

.tag--amber{color:var(--amber);border-color:rgba(242,160,61,.5);background:rgba(242,160,61,.1)}
.tag--wine{color:#E3A3B6;border-color:rgba(110,42,60,.95);background:rgba(110,42,60,.34)}
.tag--indigo{color:#BEB3F3;border-color:rgba(59,46,110,1);background:rgba(59,46,110,.36)}
.tag--steel{color:var(--mist);border-color:var(--line);background:rgba(35,64,92,.32)}

/* ---------- 07 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  padding:11px 22px;
  border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-mono);
  font-size:13.5px;
  font-weight:700;
  letter-spacing:.06em;
  white-space:nowrap;
  text-decoration:none;
  transition:transform .2s var(--ease),background .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease;
}

.btn--primary{
  background:linear-gradient(118deg,var(--amber),#FFC978);
  color:#1B1206;
  box-shadow:0 16px 32px -20px rgba(242,160,61,.95);
}
.btn--primary:hover{color:#1B1206;transform:translateY(-2px)}

.btn--ghost{
  border-color:rgba(53,224,214,.42);
  background:rgba(53,224,214,.06);
  color:var(--cyan);
}
.btn--ghost:hover{background:var(--cyan);border-color:var(--cyan);color:var(--ink-900)}

.btn--quiet{border-color:var(--line);color:var(--mist)}
.btn--quiet:hover{border-color:var(--mist);color:var(--paper)}

/* ---------- 08 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  padding:clamp(9px,.9vw,18px) clamp(8px,2.2vw,24px) 0;
}

.header-frame{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.5vw,22px);
  width:min(1400px,96vw);
  margin-inline:auto;
  padding:9px 12px 9px 16px;
  border-radius:999px;
  border:1px solid rgba(35,64,92,.95);
  background:rgba(11,26,43,.8);
  backdrop-filter:blur(16px) saturate(130%);
  -webkit-backdrop-filter:blur(16px) saturate(130%);
  box-shadow:0 28px 62px -44px rgba(0,0,0,1);
  transition:padding .3s var(--ease),background .3s ease,box-shadow .3s ease;
}

.header-frame::after{
  content:"";
  position:absolute;
  left:16px;
  right:16px;
  bottom:-1px;
  height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
  transform:scaleX(var(--scroll-progress,0));
  transform-origin:0 50%;
  opacity:.9;
  pointer-events:none;
}

.site-header[data-collapsed] .header-frame{
  padding-block:6px;
  background:rgba(9,21,36,.95);
  box-shadow:0 32px 72px -44px rgba(0,0,0,1);
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex:0 0 auto;
  color:inherit;
  text-decoration:none;
}
.brand:hover{color:inherit}

.brand-mark{
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  border-radius:11px;
  background:linear-gradient(140deg,var(--cyan),#7FF0E9);
  color:var(--ink-900);
  font-family:var(--font-display);
  font-size:19px;
  font-weight:900;
  box-shadow:0 0 0 1px rgba(53,224,214,.42),0 12px 26px -16px rgba(53,224,214,.95);
}

.brand-text{display:flex;flex-direction:column;line-height:1.22}
.brand-name{font-family:var(--font-display);font-size:15.5px;font-weight:800;letter-spacing:.02em;color:var(--paper)}
.brand-line{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--mist)}
.site-header[data-collapsed] .brand-line{display:none}

/* 导航 */
.site-nav{margin-inline:auto}

.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}

.nav-list a{
  display:inline-block;
  padding:8px 13px;
  border-radius:999px;
  border:1px solid transparent;
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  text-decoration:none;
  transition:color .2s ease,border-color .2s ease,background .2s ease;
}

.nav-list a:hover{color:var(--paper);border-color:rgba(53,224,214,.42);background:rgba(53,224,214,.07)}

.nav-list a[aria-current="page"]{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--ink-900);
  font-weight:700;
}

.nav-panel-extra{display:none}
.nav-panel-cta{width:100%}

/* 右侧工具区 */
.header-utility{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}

.device-switch{
  display:inline-flex;
  gap:2px;
  padding:3px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(11,26,43,.75);
}

.device-switch button{
  padding:6px 12px;
  border-radius:999px;
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  white-space:nowrap;
  transition:background .2s ease,color .2s ease;
}
.device-switch button:hover{color:var(--paper)}
.device-switch button[aria-pressed="true"]{background:var(--amber);color:#1B1206;font-weight:700}

.header-cta-secondary{padding:9px 16px;font-size:12.5px}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 14px;
  border-radius:999px;
  border:1px solid var(--line);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.1em;
  transition:border-color .2s ease,color .2s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.header-frame[data-open] .nav-toggle{border-color:var(--cyan);color:var(--cyan)}

.nav-toggle-bars{display:grid;gap:3px;width:16px}
.nav-toggle-bars i{display:block;height:1.5px;border-radius:2px;background:currentColor;transition:transform .22s var(--ease),opacity .22s ease}
.header-frame[data-open] .nav-toggle-bars i:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
.header-frame[data-open] .nav-toggle-bars i:nth-child(2){opacity:0}
.header-frame[data-open] .nav-toggle-bars i:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}

/* ---------- 09 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8.4vw,132px);
  border-top:1px solid rgba(35,64,92,.92);
  background:var(--ink-800);
}

.footer-band{
  height:4px;
  background:linear-gradient(90deg,
    var(--wine) 0 25%,
    var(--indigo) 25% 50%,
    var(--cyan) 50% 75%,
    var(--amber) 75% 100%);
  opacity:.88;
}

.footer-shell{
  width:var(--page);
  margin-inline:auto;
  padding:clamp(38px,5.6vw,82px) 0 30px;
}

.footer-grid{
  display:grid;
  grid-template-columns:1.55fr 1fr 1.3fr 1.1fr 1fr;
  gap:clamp(22px,3vw,46px);
  align-items:start;
}

.footer-brand{display:grid;gap:10px;align-content:start}
.footer-brand-name{margin:0;font-family:var(--font-display);font-size:22px;font-weight:900;color:var(--paper)}
.footer-brand-line{margin:0;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.22em;color:var(--amber);text-transform:uppercase}
.footer-brand-note{margin:0;max-width:34ch;color:var(--mist);font-size:13.5px;line-height:1.8}

.footer-col-title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cyan);
}

.footer-list{display:grid;gap:9px;margin:0;padding:0;list-style:none}
.footer-list a{color:var(--mist);font-size:13.5px;text-decoration:none;transition:color .2s ease,padding-left .2s ease}
.footer-list a:hover{color:var(--paper);padding-left:5px}

.footer-list--plain li{display:grid;gap:2px;color:var(--paper);font-size:13.5px;line-height:1.6}
.footer-key{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--brass)}

.footer-text{margin:0 0 10px;color:var(--mist);font-size:13.5px;line-height:1.8}
.footer-text--dim{opacity:.8;margin-bottom:0}
.footer-icp{margin:16px 0 0;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mist)}

.footer-meta{
  display:flex;
  flex-wrap:wrap;
  gap:10px 24px;
  align-items:center;
  justify-content:space-between;
  margin-top:clamp(30px,4.6vw,62px);
  padding-top:20px;
  border-top:1px solid rgba(35,64,92,.7);
}
.footer-copy{margin:0;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.08em;color:var(--mist)}
.footer-meta-note{margin:0;font-size:12px;color:rgba(159,176,192,.8)}

/* 返回顶部 */
.to-top{
  position:fixed;
  right:clamp(14px,2.2vw,30px);
  bottom:clamp(14px,2.2vw,30px);
  z-index:140;
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:11px 18px;
  border-radius:999px;
  border:1px solid rgba(53,224,214,.5);
  background:rgba(9,21,36,.93);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.08em;
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  opacity:0;
  visibility:hidden;
  transform:translateY(14px);
  transition:opacity .3s ease,transform .3s var(--ease),visibility .3s ease,background .2s ease,color .2s ease;
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--cyan);color:var(--ink-900)}
.to-top-arrow{font-size:14px;line-height:1}

/* ---------- 10 面包屑 ---------- */
.breadcrumbs{width:var(--page);margin:clamp(18px,3vw,34px) auto 0}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--mist);
}
.breadcrumb-list li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb-list li::after{content:"/";color:rgba(159,176,192,.5)}
.breadcrumb-list li:last-child::after{content:""}
.breadcrumb-list a{color:var(--mist);text-decoration:none}
.breadcrumb-list a:hover{color:var(--cyan)}
.breadcrumb-list [aria-current="page"]{color:var(--paper)}

/* ---------- 11 图片容器基础规则 ---------- */
.img-frame{
  position:relative;
  overflow:hidden;
  isolation:isolate;
  border-radius:var(--r-md);
  border:1px solid rgba(35,64,92,.88);
  background:
    repeating-linear-gradient(135deg,rgba(53,224,214,.07) 0 12px,rgba(18,40,63,.62) 12px 24px),
    var(--ink-800);
}

.img-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  aspect-ratio:16/10;
  filter:saturate(.86) contrast(1.06) brightness(.92);
}

.img-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(11,26,43,0) 44%,rgba(11,26,43,.74));
  mix-blend-mode:multiply;
}

.img-frame:empty{padding-top:62%}

.img-frame--wide img{aspect-ratio:21/9}
.img-frame--tall img{aspect-ratio:4/5}
.img-frame--square img{aspect-ratio:1/1}
.img-frame--bare{border-color:transparent;border-radius:0}
.img-frame--bare::after{display:none}

.img-caption{margin:10px 0 0;color:var(--mist);font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em}

/* ---------- 12 数据与章节轴 ---------- */
.stat{display:grid;gap:6px}
.stat-value{
  font-family:var(--font-mono);
  font-size:clamp(30px,3.8vw,54px);
  font-weight:700;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--amber);
}
.stat-label{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mist);
}

.chapter-rail{position:sticky;top:112px;align-self:start}

.chapter-rail-list{display:grid;gap:2px;margin:0;padding:0;list-style:none}

.chapter-rail-link{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:10px;
  align-items:baseline;
  padding:9px 12px;
  border-left:2px solid var(--line);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:13px;
  text-decoration:none;
  transition:color .2s ease,border-color .2s ease,background .2s ease;
}
.chapter-rail-link:hover{color:var(--paper);border-left-color:var(--cyan)}
.chapter-rail-link.is-current{
  color:var(--amber);
  border-left-color:var(--amber);
  background:linear-gradient(90deg,rgba(242,160,61,.16),rgba(242,160,61,0));
}

.chapter-rail-num{font-size:11px;letter-spacing:.16em;color:var(--brass)}
.chapter-rail-link.is-current .chapter-rail-num{color:var(--amber)}

/* ---------- 13 动效 ---------- */
.has-js .reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .62s var(--ease),transform .62s var(--ease);
}
.has-js .reveal.is-visible{opacity:1;transform:none}

/* ---------- 14 响应式 ---------- */
@media (max-width:1180px){
  .header-cta-secondary{display:none}
  .nav-list a{padding:8px 10px;font-size:12.5px}
  .device-switch button{padding:6px 10px;font-size:11.5px}
}

@media (max-width:1080px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:1024px){
  .header-frame{width:min(100%,96vw)}
  .header-utility .device-switch{display:none}
}

@media (max-width:960px){
  .nav-toggle{display:inline-flex}
  .brand-line{display:none}

  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:calc(100% + 10px);
    display:none;
    padding:16px;
    border-radius:var(--r-xl);
    border:1px solid var(--line);
    background:var(--glass-deep);
    backdrop-filter:blur(18px);
    -webkit-backdrop-filter:blur(18px);
    box-shadow:0 46px 90px -46px rgba(0,0,0,1);
  }

  .header-frame[data-open] .site-nav,
  .site-header[data-open] .site-nav{display:block}

  .nav-list{flex-direction:column;align-items:stretch;gap:4px}
  .nav-list a{display:block;padding:12px 14px;border-radius:12px;font-size:14px}
  .nav-list a[aria-current="page"]{
    background:rgba(53,224,214,.14);
    border-color:var(--cyan);
    color:var(--cyan);
  }

  .nav-panel-extra{
    display:flex;
    flex-direction:column;
    gap:12px;
    margin-top:16px;
    padding-top:16px;
    border-top:1px solid rgba(35,64,92,.75);
  }
  .nav-panel-extra .device-switch{display:inline-flex;align-self:flex-start}

  .header-utility{margin-left:auto}

  .grid--split,
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--12{grid-template-columns:minmax(0,1fr)}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9{grid-column:1 / -1}

  .chapter-rail{position:static;top:auto}
  .chapter-rail-list{grid-auto-flow:column;grid-auto-columns:minmax(150px,1fr);overflow-x:auto;padding-bottom:6px}
  .chapter-rail-link{border-left:0;border-bottom:2px solid var(--line)}
  .chapter-rail-link.is-current{background:linear-gradient(0deg,rgba(242,160,61,.16),rgba(242,160,61,0))}
}

@media (max-width:620px){
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-brand{grid-column:auto}
}

@media (max-width:560px){
  .site-header{padding-inline:8px}
  .header-frame{gap:8px;padding:7px 8px 7px 12px}
  .brand-mark{width:32px;height:32px;border-radius:9px;font-size:16px}
  .brand-name{font-size:14px}
  .btn{padding:9px 16px;font-size:12.5px}
  .nav-toggle{padding:7px 11px;font-size:11.5px}
  .footer-meta{justify-content:flex-start}
}

/* ---------- 15 减少动态偏好 ---------- */
@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 .reveal{opacity:1;transform:none}
  .to-top{transform:none}
}