/* ===========================================================
   B体育娱乐 · site.css
   夜场指挥中心：墨绿底 / 荧光青柠读数 / 精密网格 / 框景窗口
   =========================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#0B1F1A;
  --ink-2:#10302A;
  --line:#1C4438;
  --lime:#C8F94E;
  --orange:#FF6A2B;
  --silver:#B9C4C0;
  --bone:#EDE9DE;
  --moss:#7FA88F;
  --clay:#A65A3A;
  --stone:#4E6E63;

  --rail-w:236px;
  --bar-h:60px;
  --wrap:1180px;
  --gutter:clamp(18px,4vw,48px);

  --font-head:"Oswald","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --font-serif:"Source Han Serif SC","Songti SC","Noto Serif SC",Georgia,serif;

  --ease:cubic-bezier(.2,.6,.2,1);
}

/* ---------- 2. 重置与基底 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  background:var(--ink);
  scroll-behavior:smooth;
}
body{
  margin:0;
  background:transparent;
  color:var(--bone);
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.72;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(78,110,99,.10) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(78,110,99,.10) 1px, transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(120% 85% at 8% 0%, #000 8%, transparent 72%);
  mask-image:radial-gradient(120% 85% at 8% 0%, #000 8%, transparent 72%);
}
img,svg,video{max-width:100%}
[hidden]{display:none !important}

/* ---------- 3. 排版 ---------- */
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.1;
  margin:0 0 .55em;
  color:var(--bone);
}
h1{font-size:clamp(40px,6vw,88px)}
h2{font-size:clamp(26px,3vw,40px)}
h3{font-size:20px;letter-spacing:-.01em;line-height:1.28}
h4{font-size:17px;letter-spacing:0;line-height:1.35}
p{margin:0 0 1.1em;max-width:66ch}
ul,ol{margin:0 0 1.1em;padding-left:1.2em}
li{margin:0 0 .4em}
small{font-size:13px}
strong{font-weight:700;color:#fff}
hr{border:0;border-top:1px solid var(--line);margin:clamp(22px,3vw,38px) 0}

a{
  color:inherit;
  text-decoration:none;
  transition:color 140ms linear,border-color 140ms linear,background-color 140ms linear;
}
a:hover{color:var(--lime)}

:focus-visible{
  outline:2px solid var(--lime);
  outline-offset:3px;
}

::selection{background:var(--lime);color:var(--ink)}

#main-content{scroll-margin-top:calc(var(--bar-h) + 16px)}

/* ---------- 4. 布局工具 ---------- */
.wrap{
  width:100%;
  max-width:calc(var(--wrap) + var(--gutter) * 2);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(36px,6vw,80px)}
.section--tight{padding-block:clamp(20px,3vw,40px)}
.page-head{padding-block:clamp(26px,5vw,60px) clamp(16px,3vw,30px)}

.grid{display:grid;gap:clamp(16px,2.2vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--asym{grid-template-columns:minmax(0,1.35fr) minmax(0,1fr)}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:clamp(12px,2vw,24px);
  margin-bottom:clamp(20px,3vw,36px);
}

/* ---------- 5. 文字件 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--lime);
}
.eyebrow::before{
  content:"";
  width:6px;
  height:6px;
  background:var(--lime);
}
.rule{
  height:1px;
  border:0;
  margin:clamp(20px,3vw,36px) 0;
  background:var(--line);
}
.meta{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--stone);
}
.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:-.01em;
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--bone);
  background:rgba(127,168,143,.22);
  border:1px solid rgba(127,168,143,.42);
}
.tag--lime{background:rgba(200,249,78,.16);border-color:rgba(200,249,78,.5);color:var(--lime)}
.tag--alert{background:rgba(255,106,43,.16);border-color:rgba(255,106,43,.5);color:var(--orange)}

.dot{
  display:inline-block;
  width:7px;height:7px;
  background:var(--stone);
}
.dot--live{background:var(--lime);box-shadow:0 0 0 3px rgba(200,249,78,.16)}
.dot--alert{background:var(--orange);box-shadow:0 0 0 3px rgba(255,106,43,.16)}

.stat{display:block}
.stat__value{
  display:block;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(28px,4vw,52px);
  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:.18em;
  text-transform:uppercase;
  color:var(--stone);
}

/* ---------- 6. 框景窗口 ---------- */
.frame{
  position:relative;
  border:1px solid var(--line);
  background:linear-gradient(158deg,rgba(16,48,42,.94),rgba(11,31,26,.96));
  padding:clamp(18px,3vw,32px);
}
.frame::before,
.frame::after{
  content:"";
  position:absolute;
  width:16px;
  height:16px;
  pointer-events:none;
}
.frame::before{
  top:-1px;left:-1px;
  border-top:2px solid var(--lime);
  border-left:2px solid var(--lime);
}
.frame::after{
  bottom:-1px;right:-1px;
  border-bottom:2px solid var(--lime);
  border-right:2px solid var(--lime);
}
.frame__label{
  display:inline-block;
  margin:0 0 16px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--stone);
}

/* ---------- 7. 按钮与 chip ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 22px;
  font-family:var(--font-head);
  font-weight:700;
  font-size:15px;
  letter-spacing:.02em;
  line-height:1.2;
  color:var(--bone);
  background:transparent;
  border:1px solid var(--line);
  border-radius:0;
  cursor:pointer;
  text-decoration:none;
  transition:color 140ms linear,border-color 140ms linear,background-color 140ms linear;
}
.btn:hover{color:var(--lime);border-color:var(--lime)}
.btn--solid{
  background:var(--lime);
  border-color:var(--lime);
  color:#0B1F1A;
}
.btn--solid:hover{background:var(--bone);border-color:var(--bone);color:var(--ink)}
.btn--alert{
  background:var(--orange);
  border-color:var(--orange);
  color:#1A0A03;
}
.btn--alert:hover{background:#FF8A57;border-color:#FF8A57;color:#1A0A03}

.chip{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:5px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  line-height:1.5;
  text-transform:uppercase;
  color:var(--silver);
  background:transparent;
  border:1px solid var(--line);
  border-radius:0;
  cursor:pointer;
  transition:color 140ms linear,border-color 140ms linear,background-color 140ms linear;
}
.chip:hover{color:var(--lime);border-color:var(--lime)}
.chip[aria-pressed="true"]{
  background:var(--lime);
  border-color:var(--lime);
  color:#0B1F1A;
  font-weight:700;
}
.chip[aria-pressed="true"]:hover{color:#0B1F1A}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb{
  margin:0 0 22px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--stone);
}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  list-style:none;
  margin:0;
  padding:0;
}
.breadcrumb__list li{display:flex;align-items:center;margin:0}
.breadcrumb__list li + li::before{
  content:"/";
  margin:0 10px;
  color:var(--stone);
  opacity:.6;
}
.breadcrumb__list a{color:var(--silver)}
.breadcrumb__list a:hover{color:var(--lime)}
.breadcrumb__list [aria-current="page"]{color:var(--bone)}

/* ---------- 9. 正文区 ---------- */
.prose{max-width:66ch}
.prose h2{font-size:clamp(22px,2.4vw,30px);margin-top:1.7em}
.prose h3{margin-top:1.6em}
.prose ul,.prose ol{padding-left:1.15em}
.prose li{margin-bottom:.45em}
.prose blockquote{
  margin:1.6em 0;
  padding:14px 20px;
  border-left:2px solid var(--lime);
  background:rgba(28,68,56,.42);
  font-family:var(--font-serif);
  font-size:1.04em;
  color:var(--bone);
}

/* ---------- 10. 图片容器（页面阶段使用） ---------- */
.media{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 9;
  background:var(--ink-2);
  border:1px solid var(--line);
}
.media img,
.media video{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(196deg,rgba(200,249,78,.12),transparent 44%,rgba(11,31,26,.74) 100%);
}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:3 / 4}
.media--square{aspect-ratio:1 / 1}
.media__placeholder{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  padding:16px;
  text-align:center;
  color:var(--stone);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  background-image:
    repeating-linear-gradient(115deg,rgba(200,249,78,.07) 0 2px,transparent 2px 26px),
    radial-gradient(92% 82% at 18% 8%,rgba(127,168,143,.30),transparent 62%);
}
.media__caption{
  margin:10px 0 0;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--stone);
}

/* ---------- 11. 时间轴 ---------- */
.timeline{list-style:none;margin:0;padding:0}
.timeline__item{
  position:relative;
  padding:0 0 26px 26px;
  border-left:1px solid var(--line);
}
.timeline__item::before{
  content:"";
  position:absolute;
  left:-4px;
  top:7px;
  width:7px;
  height:14px;
  background:var(--moss);
}
.timeline__item--live::before{background:var(--lime)}
.timeline__item--alert::before{background:var(--orange)}
.timeline__item:last-child{border-left-color:transparent}

/* ---------- 12. 分段切换 ---------- */
.tabs{
  display:flex;
  flex-wrap:wrap;
  gap:2px;
  border-bottom:1px solid var(--line);
}
.tab{
  appearance:none;
  background:transparent;
  border:0;
  border-bottom:2px solid transparent;
  border-radius:0;
  padding:12px 18px;
  font-family:var(--font-head);
  font-weight:700;
  font-size:15px;
  letter-spacing:.02em;
  color:var(--silver);
  cursor:pointer;
  transition:color 140ms linear,border-color 140ms linear,background-color 140ms linear;
}
.tab:hover{color:var(--bone);background:rgba(200,249,78,.06)}
.tab[aria-selected="true"]{
  color:var(--lime);
  border-bottom-color:var(--lime);
}
.tab-panel{padding-top:22px;animation:panelIn 200ms var(--ease) both}
@keyframes panelIn{
  from{opacity:0;transform:translateY(6px)}
  to{opacity:1;transform:none}
}

/* ---------- 13. 品牌标识 ---------- */
.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  color:var(--bone);
  text-decoration:none;
}
.brand:hover{color:var(--bone)}
.brand__mark{
  display:grid;
  place-items:center;
  flex:0 0 auto;
  width:34px;
  height:34px;
  background:var(--lime);
  color:#0B1F1A;
  font-family:var(--font-head);
  font-weight:800;
  font-size:19px;
  line-height:1;
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
}
.brand__text{display:flex;flex-direction:column;gap:3px;min-width:0}
.brand__name{
  font-family:var(--font-head);
  font-weight:800;
  font-size:19px;
  line-height:1.1;
  letter-spacing:-.01em;
}
.brand__tagline{
  font-family:var(--font-mono);
  font-size:10px;
  line-height:1.3;
  letter-spacing:.1em;
  color:var(--stone);
  white-space:nowrap;
}

/* ---------- 14. 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:12px;
  z-index:200;
  padding:12px 18px;
  background:var(--lime);
  color:#0B1F1A;
  font-family:var(--font-head);
  font-weight:700;
  font-size:14px;
  transform:translateY(-200%);
  transition:transform 140ms var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{
  transform:translateY(0);
  outline:2px solid var(--bone);
  outline-offset:2px;
}

/* ---------- 15. 头部 · 桌面侧轨 ---------- */
.masthead{
  position:fixed;
  top:0;
  left:0;
  bottom:0;
  width:var(--rail-w);
  z-index:60;
  display:flex;
  flex-direction:column;
  gap:18px;
  padding:22px 18px 24px;
  background:linear-gradient(180deg,#12312A 0%,#0B1F1A 64%);
  border-right:1px solid var(--line);
  overflow-y:auto;
  overscroll-behavior:contain;
}
.masthead::after{
  content:"";
  position:absolute;
  top:0;right:0;
  width:1px;
  height:38%;
  background:linear-gradient(180deg,var(--lime),transparent);
  opacity:.55;
  pointer-events:none;
}
.masthead__bar{
  display:flex;
  flex-direction:column;
  gap:12px;
}
.masthead__actions{display:none}

.mini-btn{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:8px 11px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--bone);
  background:transparent;
  border:1px solid var(--line);
  border-radius:0;
  cursor:pointer;
  transition:color 140ms linear,border-color 140ms linear,background-color 140ms linear;
}
.mini-btn:hover{color:var(--lime);border-color:var(--lime)}
.mini-btn__text{line-height:1}
.mini-btn__bars{display:grid;gap:3px}
.mini-btn__bars i{
  display:block;
  width:13px;
  height:2px;
  background:currentColor;
  transition:transform 160ms var(--ease),opacity 120ms linear;
}
.masthead[data-open="true"] .mini-btn--toggle{
  color:var(--lime);
  border-color:var(--lime);
}
.masthead[data-open="true"] .mini-btn__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.masthead[data-open="true"] .mini-btn__bars i:nth-child(2){opacity:0}
.masthead[data-open="true"] .mini-btn__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.rail{
  display:flex;
  flex-direction:column;
  gap:18px;
  flex:1 1 auto;
  min-height:0;
}
.rail__nav{display:block}
.rail__eyebrow{
  margin:0 0 10px;
  padding-left:6px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--stone);
}
.rail__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:2px;
}
.rail__item{margin:0}
.rail__link{
  position:relative;
  display:grid;
  grid-template-columns:6px 22px minmax(0,1fr);
  align-items:center;
  gap:9px;
  padding:11px 10px 11px 8px;
  font-size:15px;
  line-height:1.35;
  color:var(--silver);
  text-decoration:none;
  border-left:2px solid transparent;
  transition:color 160ms linear,background-color 160ms linear,border-color 160ms linear;
}
.rail__tick{width:6px;height:6px;background:var(--stone);transition:background-color 160ms linear}
.rail__num{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.06em;
  color:var(--stone);
  transition:color 160ms linear;
}
.rail__label{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rail__link:hover{color:var(--bone);background:rgba(200,249,78,.07)}
.rail__link:hover .rail__tick{background:var(--lime)}
.rail__link[aria-current="page"]{
  color:#0B1F1A;
  background:var(--lime);
  border-left-color:var(--lime);
  font-weight:700;
}
.rail__link[aria-current="page"] .rail__tick{background:#0B1F1A}
.rail__link[aria-current="page"] .rail__num{color:#3B4E1C}

.search-rail{
  display:flex;
  flex-direction:column;
  gap:11px;
  padding-top:16px;
  border-top:1px solid var(--line);
}
.search-rail__label{
  margin:0;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--stone);
}
.search-rail__field{
  display:flex;
  align-items:center;
  gap:9px;
  padding:7px 6px 7px 2px;
  border-bottom:1px solid var(--line);
}
.search-rail__icon{
  position:relative;
  flex:0 0 auto;
  width:9px;
  height:9px;
  border:1px solid var(--stone);
}
.search-rail__icon::after{
  content:"";
  position:absolute;
  right:-5px;
  bottom:-3px;
  width:5px;
  height:1px;
  background:var(--stone);
  transform:rotate(45deg);
}
.search-rail__input{
  flex:1 1 auto;
  min-width:0;
  padding:2px 0;
  font-family:var(--font-body);
  font-size:14px;
  color:var(--bone);
  background:transparent;
  border:0;
  appearance:none;
}
.search-rail__input::placeholder{color:var(--stone)}
.search-rail__input:focus{outline:none}
.search-rail__input:focus-visible{outline:2px solid var(--lime);outline-offset:4px}
.search-rail__chips{display:flex;flex-wrap:wrap;gap:6px}

.rail__foot{
  margin-top:auto;
  padding-top:14px;
  border-top:1px solid var(--line);
  display:flex;
  flex-direction:column;
  gap:10px;
}
.rail__code{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:var(--stone);
}
.rail__cta{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:8px;
  padding:10px 12px;
  font-family:var(--font-head);
  font-weight:700;
  font-size:13.5px;
  letter-spacing:.02em;
  color:var(--lime);
  background:rgba(200,249,78,.1);
  border:1px solid rgba(200,249,78,.34);
  text-decoration:none;
  transition:background-color 140ms linear,color 140ms linear,border-color 140ms linear;
}
.rail__cta::after{content:"→";font-family:var(--font-mono)}
.rail__cta:hover{background:var(--lime);border-color:var(--lime);color:#0B1F1A}

/* ---------- 16. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  padding:clamp(34px,5vw,66px) var(--gutter) 26px;
  background:var(--ink-2);
  border-top:1px solid var(--line);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:190px;
  pointer-events:none;
  background:linear-gradient(92deg,rgba(200,249,78,.13),rgba(200,249,78,0) 62%);
  clip-path:polygon(0 0,100% 0,100% 26%,0 100%);
}
.site-footer__grid{
  position:relative;
  display:grid;
  grid-template-columns:1.45fr 1fr 1fr 1.25fr;
  gap:clamp(24px,4vw,48px);
  max-width:var(--wrap);
  margin-inline:auto;
}
.site-footer__col{min-width:0}
.site-footer__pitch{
  margin:16px 0 0;
  max-width:26ch;
  font-size:14px;
  line-height:1.65;
  color:var(--stone);
}
.footer-title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--lime);
}
.footer-list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:9px;
  font-size:14.5px;
  line-height:1.6;
}
.footer-list li{margin:0}
.footer-list a{
  color:var(--silver);
  border-bottom:1px solid transparent;
  padding-bottom:1px;
}
.footer-list a:hover{color:var(--lime);border-bottom-color:var(--lime)}
.footer-list--plain{
  gap:11px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.02em;
  color:var(--silver);
  word-break:break-word;
}
.footer-key{
  display:inline-block;
  min-width:3.2em;
  margin-right:6px;
  color:var(--stone);
}
.site-footer__legal{
  position:relative;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 20px;
  max-width:var(--wrap);
  margin:clamp(28px,4vw,46px) auto 0;
  padding-top:16px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--stone);
}
.site-footer__legal a{
  color:var(--silver);
  border-bottom:1px solid transparent;
  padding-bottom:1px;
}
.site-footer__legal a:hover{color:var(--lime);border-bottom-color:var(--lime)}
.site-footer__icp{color:var(--stone)}
.site-footer__copy{margin-left:auto;color:var(--stone)}

/* ---------- 17. 阅读进度刻度尺 ---------- */
.to-top{
  position:fixed;
  right:14px;
  bottom:74px;
  z-index:45;
  display:none;
  flex-direction:column;
  align-items:center;
  gap:7px;
  width:38px;
  padding:9px 0;
  color:var(--lime);
  background:rgba(16,48,42,.94);
  border:1px solid var(--line);
  border-radius:0;
  cursor:pointer;
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1;
  transition:border-color 140ms linear,color 140ms linear;
}
.to-top[data-visible="true"]{display:flex}
.to-top:hover{border-color:var(--lime)}
.to-top__track{
  display:block;
  width:3px;
  height:62px;
  background:rgba(185,196,192,.22);
  overflow:hidden;
}
.to-top__fill{
  display:block;
  width:100%;
  height:100%;
  background:var(--lime);
  transform-origin:top center;
  transform:scaleY(0);
  transition:transform 120ms linear;
}
.to-top__glyph{display:block;line-height:1}

/* ---------- 18. 桌面内容偏移 ---------- */
@media (min-width:961px){
  body{padding-inline-start:var(--rail-w)}
}
@media (min-width:961px) and (max-width:1220px){
  :root{--rail-w:214px}
}

/* ---------- 19. 平板与手机 ---------- */
@media (max-width:960px){
  :root{--bar-h:60px}

  .masthead{
    position:sticky;
    top:0;
    left:auto;
    bottom:auto;
    width:100%;
    height:auto;
    display:block;
    padding:0 var(--gutter);
    background:#0B1F1A;
    border-right:0;
    border-bottom:1px solid var(--line);
    overflow:visible;
  }
  .masthead::after{display:none}

  .masthead__bar{
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    width:100%;
    height:var(--bar-h);
  }
  .masthead__actions{
    display:flex;
    align-items:center;
    gap:8px;
  }
  .brand__tagline{display:none}
  .brand__mark{width:30px;height:30px;font-size:17px}
  .brand__name{font-size:17px}

  .rail{
    position:fixed;
    top:var(--bar-h);
    left:0;
    right:auto;
    bottom:0;
    width:min(342px,88vw);
    padding:22px var(--gutter) 30px;
    background:#0B1F1A;
    border-right:1px solid var(--line);
    overflow-y:auto;
    overscroll-behavior:contain;
    transform:translateX(-102%);
    transition:transform 240ms var(--ease);
    z-index:70;
  }
  .masthead[data-open="true"] .rail{transform:translateX(0)}

  .rail__link{padding:13px 10px 13px 8px;font-size:15.5px}
  .rail__foot{margin-top:26px}

  .site-footer__grid{grid-template-columns:1fr 1fr}
  .site-footer__brand{grid-column:1 / -1}
  .site-footer__copy{margin-left:0}
}

@media (max-width:720px){
  body{font-size:16px;line-height:1.7}
  .grid--2,.grid--3,.grid--asym{grid-template-columns:1fr}
  .site-footer__grid{grid-template-columns:1fr}
  .site-footer__legal{gap:8px 14px;font-size:11.5px}
  .to-top{right:10px;bottom:64px;width:34px}
  .to-top__track{height:52px}
  .section-head{align-items:flex-start}
  .tabs{gap:0}
  .tab{padding:11px 13px;font-size:14px}
}

/* ---------- 20. 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;
    scroll-behavior:auto !important;
  }
  .tab-panel{animation:none}
  .to-top__fill{transition:none}
}