/* =========================================================
   风云体育 · 共享站点样式 /assets/site.css
   夜场墨绿基底 / 荧光青柠数据高亮 / 信号橙行动色 / 斜向数据带
   ========================================================= */

/* ---------- 1. 设计变量 ---------- */
:root{
  --night:#071B16;
  --night-deep:#04110D;
  --moss:#0E2A22;
  --stone:#1C3A30;
  --lime:#C8FF3D;
  --orange:#FF7A1A;
  --red:#E4573D;
  --amber:#F2B441;
  --ivory:#F3F0E6;
  --mist:#8FB8A8;

  --line:rgba(143,184,168,.22);
  --line-soft:rgba(143,184,168,.12);
  --line-lime:rgba(200,255,61,.42);

  --r-xl:32px;
  --r-lg:24px;
  --r-md:16px;
  --r-pill:999px;

  --shell-w:1240px;
  --gutter:clamp(18px,4vw,48px);
  --block:clamp(44px,7vw,96px);
  --skew:-6deg;

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

  --shadow-card:0 18px 40px rgba(0,0,0,.38);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,picture,video{display:block;max-width:100%;}
button,input,select,textarea{font:inherit;color:inherit;}
a{color:inherit;}
table{border-collapse:collapse;width:100%;}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  background-color:var(--night);
  background-image:
    radial-gradient(1100px 520px at 84% -10%,rgba(200,255,61,.10),transparent 62%),
    radial-gradient(900px 460px at 6% 2%,rgba(255,122,26,.08),transparent 60%),
    repeating-linear-gradient(90deg,rgba(143,184,168,.05) 0 1px,transparent 1px 96px);
  background-attachment:fixed;
  color:var(--ivory);
  font-family:var(--font-body);
  font-size:clamp(15.5px,1.05vw + 12px,17.5px);
  line-height:1.78;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.08;
  letter-spacing:-.01em;
  color:var(--ivory);
}
h1{font-size:clamp(34px,6vw,64px);}
h2{font-size:clamp(26px,3.6vw,42px);}
h3{font-size:clamp(19px,1.9vw,25px);line-height:1.24;}
h4{font-size:clamp(16px,1.4vw,19px);line-height:1.35;}
p{max-width:76ch;}
strong{color:var(--lime);font-weight:700;}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible,
summary:focus-visible{
  outline:2px solid var(--lime);
  outline-offset:3px;
  border-radius:8px;
}

.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;
}

/* ---------- 4. 布局外壳 ---------- */
.shell{
  width:100%;
  max-width:var(--shell-w);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:var(--block);}

.grid{display:grid;gap:clamp(18px,2.4vw,32px);}
.grid-split{grid-template-columns:minmax(0,7fr) minmax(0,5fr);}
.grid-split-rev{grid-template-columns:minmax(0,5fr) minmax(0,7fr);}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr));}

/* ---------- 5. 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:14px;
  top:-80px;
  z-index:200;
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:0 20px;
  border-radius:var(--r-pill);
  background:var(--lime);
  color:var(--night-deep);
  font-weight:700;
  text-decoration:none;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:14px;}

/* ---------- 6. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(7,27,22,.94);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}

.progress-rail{
  position:absolute;
  inset:0 0 auto 0;
  height:3px;
  background:rgba(200,255,61,.12);
  overflow:hidden;
}
.progress-bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--lime),var(--orange));
  transition:width .12s linear;
}

.header-util{
  background:linear-gradient(90deg,var(--night-deep),rgba(14,42,34,.9) 65%,var(--night-deep));
  border-bottom:1px solid var(--line-soft);
}
.util-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px clamp(14px,2.6vw,34px);
  min-height:40px;
  padding-block:7px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--mist);
}
.util-brand{
  max-width:none;
  color:var(--lime);
  letter-spacing:.14em;
}
.util-line{
  max-width:none;
  color:var(--mist);
}
.util-aside{
  display:flex;
  align-items:center;
  gap:14px;
  margin-left:auto;
}
.status-pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:3px 12px 3px 10px;
  border-radius:var(--r-pill);
  border:1px solid rgba(200,255,61,.32);
  background:rgba(200,255,61,.08);
  color:var(--lime);
  font-size:10.5px;
  letter-spacing:.12em;
  white-space:nowrap;
}
.status-dot{
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--lime);
  box-shadow:0 0 0 3px rgba(200,255,61,.18);
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{opacity:1;box-shadow:0 0 0 3px rgba(200,255,61,.18);}
  50%{opacity:.55;box-shadow:0 0 0 6px rgba(200,255,61,.06);}
}
.util-link{
  color:var(--ivory);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.util-link:hover{color:var(--lime);border-bottom-color:var(--lime);}

.header-main{
  background:linear-gradient(180deg,rgba(14,42,34,.55),rgba(7,27,22,.15));
}
.header-inner{
  display:flex;
  align-items:center;
  gap:clamp(16px,3vw,40px);
  padding-block:14px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--ivory);
  flex:0 0 auto;
}
.brand-mark{
  display:grid;
  place-items:center;
  width:46px;
  height:46px;
  background:linear-gradient(150deg,var(--lime),#93d92b);
  color:var(--night-deep);
  font-family:var(--font-mono);
  font-weight:700;
  font-size:16px;
  letter-spacing:.02em;
  clip-path:polygon(0 0,100% 0,100% 74%,82% 100%,0 100%);
  transition:transform .22s var(--ease),filter .22s var(--ease);
}
.brand:hover .brand-mark{transform:translateY(-2px);filter:brightness(1.08);}
.brand-type{display:flex;flex-direction:column;gap:2px;}
.brand-name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:19px;
  letter-spacing:.08em;
  line-height:1.1;
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mist);
}

.site-nav{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,24px);
  margin-left:auto;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:4px;
}
.nav-link{
  display:inline-block;
  padding:9px 14px;
  border-radius:var(--r-pill);
  color:rgba(243,240,230,.78);
  font-size:14.5px;
  letter-spacing:.04em;
  text-decoration:none;
  transition:color .2s var(--ease),background-color .2s var(--ease);
}
.nav-link:hover{color:var(--lime);background:rgba(200,255,61,.08);}
.nav-link[aria-current="page"]{
  color:var(--night-deep);
  background:var(--lime);
  font-weight:700;
  box-shadow:0 6px 16px rgba(200,255,61,.22);
}
.header-cta{flex:0 0 auto;}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  min-height:44px;
  padding:0 16px;
  border-radius:var(--r-pill);
  border:1px solid var(--line-lime);
  background:rgba(28,58,48,.7);
  color:var(--ivory);
  cursor:pointer;
}
.nav-toggle-bars{
  position:relative;
  width:18px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:background-color .2s var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .22s var(--ease),top .22s var(--ease);
}
.nav-toggle-bars::before{top:-6px;}
.nav-toggle-bars::after{top:6px;}
.nav-toggle-text{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
}

/* 展开态 */
.site-header[data-open] .nav-toggle-bars{background:transparent;}
.site-header[data-open] .nav-toggle-bars::before{top:0;transform:rotate(45deg);}
.site-header[data-open] .nav-toggle-bars::after{top:0;transform:rotate(-45deg);}

/* 桌面：斜切胶囊导航 */
@media (min-width:1024px){
  .nav-list{transform:skewX(-4deg);}
  .nav-link{transform:skewX(4deg);}
}

/* 移动导航 */
@media (max-width:1023px){
  .nav-toggle{display:inline-flex;}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    flex-direction:column;
    align-items:stretch;
    gap:12px;
    margin-left:0;
    padding:16px var(--gutter) 26px;
    background:var(--night-deep);
    border-bottom:1px solid var(--line);
    box-shadow:0 26px 48px rgba(0,0,0,.5);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s var(--ease);
  }
  .site-header[data-open] .site-nav{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:2px;}
  .nav-link{display:block;padding:12px 14px;border-radius:14px;font-size:16px;}
  .header-cta{width:100%;min-height:46px;}
  .util-line{display:none;}
}
@media (max-width:640px){
  .util-brand{display:none;}
  .util-aside{margin-left:0;width:100%;justify-content:space-between;}
  .brand-mark{width:40px;height:40px;font-size:14px;}
  .brand-name{font-size:17px;}
}

/* ---------- 7. 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 22px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-family:var(--font-body);
  font-size:14.5px;
  font-weight:700;
  letter-spacing:.04em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn:hover{transform:translateY(-2px);}
.btn:active{transform:translateY(0);}
.btn-primary{
  background:var(--orange);
  color:#150800;
  box-shadow:0 10px 24px rgba(255,122,26,.28);
}
.btn-primary:hover{background:#ff8d3d;box-shadow:0 14px 30px rgba(255,122,26,.38);}
.btn-ghost{
  background:transparent;
  color:var(--lime);
  border-color:var(--line-lime);
}
.btn-ghost:hover{background:rgba(200,255,61,.12);border-color:var(--lime);}
.btn-quiet{
  background:rgba(243,240,230,.06);
  color:var(--ivory);
  border-color:var(--line);
}
.btn-quiet:hover{background:rgba(243,240,230,.13);border-color:var(--mist);}

/* ---------- 8. 标签胶囊 ---------- */
.chip{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:4px 12px;
  border-radius:var(--r-pill);
  border:1px solid var(--line);
  background:rgba(28,58,48,.6);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  white-space:nowrap;
}
.chip-lime{color:var(--lime);border-color:var(--line-lime);background:rgba(200,255,61,.1);}
.chip-orange{color:var(--orange);border-color:rgba(255,122,26,.42);background:rgba(255,122,26,.1);}
.chip-amber{color:var(--amber);border-color:rgba(242,180,65,.42);background:rgba(242,180,65,.1);}
.chip-red{color:var(--red);border-color:rgba(228,87,61,.42);background:rgba(228,87,61,.12);}

/* ---------- 9. 章节抬头 ---------- */
.eyebrow{
  display:block;
  margin-bottom:12px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--mist);
}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:12px 30px;
  margin-bottom:clamp(20px,3vw,36px);
  padding-bottom:14px;
  border-bottom:1px solid var(--line);
}
.section-title{max-width:24ch;}
.section-note{
  max-width:44ch;
  color:var(--mist);
  font-size:14.5px;
  line-height:1.7;
}

/* ---------- 10. 卡片与数据 ---------- */
.card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:clamp(18px,2.2vw,28px);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  background:linear-gradient(165deg,rgba(28,58,48,.8),rgba(14,42,34,.92));
  transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.card:hover{
  transform:translateY(-3px);
  border-color:var(--line-lime);
  box-shadow:var(--shadow-card);
}
.card-title{
  font-family:var(--font-display);
  font-size:clamp(17px,1.6vw,20px);
  font-weight:800;
  letter-spacing:.01em;
  color:var(--ivory);
}
.card-note{
  max-width:52ch;
  color:var(--mist);
  font-size:14.5px;
  line-height:1.72;
}

.stat{display:block;}
.stat-value{
  display:block;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(26px,3.4vw,40px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--lime);
}
.stat-label{
  display:block;
  margin-top:9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--mist);
}

/* ---------- 11. 图片容器（页面阶段放占位图） ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  background:
    radial-gradient(120% 120% at 14% 8%,rgba(200,255,61,.16),transparent 56%),
    linear-gradient(160deg,var(--stone),var(--night-deep));
  aspect-ratio:16/10;
  min-height:180px;
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(243,240,230,.055) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(90deg,rgba(243,240,230,.055) 0 1px,transparent 1px 44px);
}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame--tall{aspect-ratio:3/4;}
.media-frame--heat{
  aspect-ratio:4/3;
  background:
    radial-gradient(circle at 42% 58%,rgba(255,122,26,.58),rgba(228,87,61,.26) 34%,rgba(7,27,22,.94) 74%),
    linear-gradient(160deg,var(--stone),var(--night-deep));
}

/* ---------- 12. 斜切数据带 ---------- */
.data-band{
  position:relative;
  height:clamp(34px,5vw,64px);
  margin-block:clamp(26px,5vw,56px);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background:
    repeating-linear-gradient(115deg,rgba(200,255,61,.16) 0 2px,transparent 2px 22px),
    linear-gradient(90deg,var(--stone),rgba(14,42,34,.35));
  clip-path:polygon(0 16%,100% 0,100% 84%,0 100%);
}

/* ---------- 13. 章节索引 ---------- */
.chapter-rail{position:sticky;top:150px;align-self:start;}
.chapter-list{
  display:flex;
  flex-direction:column;
  gap:2px;
  padding-left:14px;
  border-left:1px solid var(--line);
}
.chapter-link{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:7px 0;
  color:var(--mist);
  font-size:13.5px;
  text-decoration:none;
  transition:color .22s var(--ease);
}
.chapter-link:hover{color:var(--ivory);}
.chapter-link.is-active{color:var(--lime);font-weight:700;}
.chapter-num{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  opacity:.72;
}

/* ---------- 14. 正文与面包屑 ---------- */
.prose{max-width:70ch;}
.prose p{margin-bottom:1.05em;line-height:1.82;}
.prose h2,.prose h3{margin-block:1.6em .55em;}
.prose ul{list-style:disc;padding-left:1.15em;margin-bottom:1.05em;}
.prose ol{list-style:decimal;padding-left:1.2em;margin-bottom:1.05em;}
.prose li{margin-bottom:.42em;}
.prose a{color:var(--lime);text-underline-offset:3px;}
.prose blockquote{
  margin:1.4em 0;
  padding:14px 20px;
  border-left:3px solid var(--lime);
  border-radius:0 var(--r-md) var(--r-md) 0;
  background:rgba(28,58,48,.6);
  color:var(--ivory);
}

.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin-bottom:20px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
}
.breadcrumbs a{color:var(--mist);text-decoration:none;}
.breadcrumbs a:hover{color:var(--lime);}
.crumb-sep{opacity:.5;}
.breadcrumbs [aria-current="page"]{color:var(--ivory);}

/* ---------- 15. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  overflow:hidden;
  background:linear-gradient(180deg,var(--night-deep),#020a07);
  border-top:1px solid var(--line);
  color:var(--ivory);
}
.footer-band{
  position:absolute;
  top:0;
  left:-8%;
  width:116%;
  height:2px;
  background:linear-gradient(90deg,transparent,var(--lime) 28%,var(--orange) 68%,transparent);
  transform:rotate(-1.2deg);
  opacity:.9;
  pointer-events:none;
}
.footer-inner{
  display:grid;
  grid-template-columns:minmax(230px,1.25fr) minmax(0,1.6fr) minmax(240px,1.15fr);
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(34px,5vw,62px) clamp(26px,3.6vw,44px);
}
.footer-lead{display:flex;flex-direction:column;gap:16px;}
.brand-footer{margin-bottom:2px;}
.footer-tagline{
  max-width:30ch;
  color:rgba(243,240,230,.86);
  font-size:15px;
  line-height:1.7;
}
.footer-region{
  max-width:none;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,2.4vw,32px);
}
.footer-col{display:flex;flex-direction:column;gap:12px;}
.footer-col-title{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--lime);
}
.footer-links{display:flex;flex-direction:column;gap:9px;}
.footer-link{
  display:inline-block;
  color:rgba(243,240,230,.82);
  font-size:14px;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.footer-link:hover{color:var(--lime);border-bottom-color:rgba(200,255,61,.5);transform:translateX(2px);}

.footer-contact{display:flex;flex-direction:column;gap:12px;}
.footer-contact-title{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--lime);
}
.contact-list{display:flex;flex-direction:column;}
.contact-item{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:4px 10px;
  padding-block:7px;
  border-bottom:1px dashed var(--line-soft);
}
.contact-label{
  flex:0 0 auto;
  min-width:40px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  color:var(--mist);
}
.contact-value{
  flex:1 1 auto;
  min-width:0;
  font-size:13.5px;
  line-height:1.6;
  color:rgba(243,240,230,.9);
  word-break:break-word;
}
.copy-btn{
  flex:0 0 auto;
  padding:3px 10px;
  border-radius:var(--r-pill);
  border:1px solid var(--line);
  background:transparent;
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.copy-btn:hover{color:var(--lime);border-color:var(--line-lime);background:rgba(200,255,61,.08);}
.copy-btn.is-copied{color:var(--night-deep);background:var(--lime);border-color:var(--lime);}
.footer-note{
  max-width:34ch;
  color:var(--mist);
  font-size:12.5px;
  line-height:1.65;
}

.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 26px;
  width:100%;
  max-width:var(--shell-w);
  margin-inline:auto;
  padding:18px var(--gutter) 26px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--mist);
}
.legal-copy{max-width:none;}
.legal-links{display:flex;flex-wrap:wrap;gap:8px 20px;}
.legal-link{
  color:var(--mist);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.legal-link:hover{color:var(--lime);border-bottom-color:rgba(200,255,61,.5);}

@media (max-width:960px){
  .footer-inner{grid-template-columns:minmax(0,1fr);}
  .chapter-rail{position:static;}
  .grid-split,.grid-split-rev,.grid-3{grid-template-columns:minmax(0,1fr);}
}
@media (max-width:640px){
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-legal{flex-direction:column;align-items:flex-start;}
}

/* ---------- 16. 滚动显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 17. 降级 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none;}
  .btn:hover,.card:hover,.footer-link:hover,.brand:hover .brand-mark{transform:none;}
  .status-dot{animation:none;}
  .progress-bar{transition:none;}
}