/* =========================================================
   火博体育看台 · 赛场坐标共享样式 /assets/site.css
   炭黑底 + 坐标网格 + 状态灯色彩语义
   ========================================================= */

/* ---------- 0. 变量 ---------- */
:root{
  --ink:#0E1116;
  --panel:#171C22;
  --panel-2:#1D242C;
  --line:#333C46;
  --lava:#FF5A21;
  --signal:#FFC53D;
  --turf:#35C06F;
  --steel:#6C8AA6;
  --cyan:#37E2D5;
  --paper:#F1F4F7;
  --mist:#97A3B0;

  --font-head:"Source Han Sans SC Heavy","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --fs-12:12px;
  --fs-14:14px;
  --fs-16:16px;
  --fs-20:20px;
  --fs-28:28px;
  --fs-44:44px;
  --fs-72:72px;

  --shell:1320px;
  --pad:clamp(18px,4vw,56px);
  --gap:clamp(16px,2.2vw,32px);
  --r-lg:22px;
  --r-md:12px;
  --r-sm:6px;
  --header-h:84px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  -webkit-font-smoothing:antialiased;
}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:var(--fs-16);
  line-height:1.75;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    linear-gradient(to right,rgba(51,60,70,.22) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(51,60,70,.22) 1px,transparent 1px);
  background-size:58px 58px;
  background-attachment:fixed;
  overflow-x:hidden;
}
body.is-nav-open{overflow:hidden}
img,svg,video{display:block;max-width:100%}
h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-head);
  font-weight:900;
  line-height:1.15;
  letter-spacing:-.03em;
}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
input{font:inherit}
[hidden]{display:none !important}
[id]{scroll-margin-top:calc(var(--header-h) + 20px)}
::selection{background:var(--lava);color:#0B0D11}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* ---------- 2. 排版工具 ---------- */
.h1{font-family:var(--font-head);font-weight:900;font-size:clamp(40px,7vw,var(--fs-72));letter-spacing:-.04em;line-height:1.08}
.h2{font-family:var(--font-head);font-weight:900;font-size:clamp(26px,3.4vw,var(--fs-44));letter-spacing:-.03em}
.h3{font-family:var(--font-head);font-weight:900;font-size:clamp(20px,2.2vw,var(--fs-28));letter-spacing:-.02em}
.lede{font-size:clamp(16px,1.5vw,var(--fs-20));line-height:1.7;color:var(--mist);max-width:40ch}
.kicker,.index-label{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--steel);
}
.kicker::before{content:"";width:22px;height:1px;background:var(--lava)}
.prose{max-width:38ch;font-size:16.5px;line-height:1.75;color:#DCE2E9}
.prose p+p{margin-top:1.05em}
.prose ul{margin-top:.6em}
.prose li{position:relative;padding-left:1.1em}
.prose li+li{margin-top:.35em}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;background:var(--steel);border-radius:50%}
.prose strong{color:#fff;font-weight:700}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.rule{height:1px;border:0;margin:0;background:repeating-linear-gradient(90deg,var(--line) 0 6px,transparent 6px 14px)}

/* ---------- 3. 容器与栅格 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--pad)}
.section{padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(28px,4vw,56px)}
.section-head{
  display:grid;
  grid-template-columns:minmax(0,7fr) minmax(0,3fr);
  align-items:end;
  gap:var(--gap);
  margin-bottom:clamp(24px,3vw,44px);
}
.grid{display:grid;gap:var(--gap)}
.grid--7-3{grid-template-columns:minmax(0,7fr) minmax(0,3fr)}
.grid--5-4{grid-template-columns:minmax(0,5fr) minmax(0,4fr)}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ---------- 4. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-body);
  font-size:var(--fs-14);
  font-weight:700;
  letter-spacing:.02em;
  white-space:nowrap;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn--cta{background:var(--lava);color:#0B0D11}
.btn--cta:hover{background:#FF7846}
.btn--ghost{border-color:var(--line);color:var(--paper)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--quiet{padding:8px 0;border-radius:0;font-family:var(--font-mono);font-size:var(--fs-12);letter-spacing:.12em;color:var(--cyan)}

/* ---------- 5. 标签与提示 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.06em;
  white-space:nowrap;
}
.tag--ok{color:var(--turf);border-color:rgba(53,192,111,.42);background:rgba(53,192,111,.1)}
.tag--check{color:var(--signal);border-color:rgba(255,197,61,.42);background:rgba(255,197,61,.1)}
.tag--revisit{color:var(--signal);border-color:var(--signal);border-style:dashed;background:transparent}
.tag--archived{color:var(--mist);border-color:var(--line);background:transparent}
.tag--alert{color:var(--lava);border-color:rgba(255,90,33,.45);background:rgba(255,90,33,.12)}
.tag--data{color:var(--steel);border-color:rgba(108,138,166,.4);background:transparent}

.callout{
  padding:18px 20px;
  border:1px solid var(--line);
  border-left:3px solid var(--lava);
  border-radius:var(--r-sm);
  background:rgba(23,28,34,.72);
  font-size:15px;
  line-height:1.7;
  color:#DCE2E9;
}
.callout--ok{border-left-color:var(--turf)}
.callout--note{border-left-color:var(--steel)}

/* ---------- 6. 面板与条幅 ---------- */
.panel{
  position:relative;
  padding:clamp(20px,2.4vw,32px);
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
}
.panel--notch{border-radius:var(--r-lg) var(--r-sm) var(--r-lg) var(--r-lg)}
.panel__head{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:18px;
}
.band{
  position:relative;
  padding-block:clamp(18px,2.4vw,28px);
  background:var(--panel-2);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  overflow:hidden;
}
.band::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:6px;
  background:repeating-linear-gradient(90deg,var(--steel) 0 1px,transparent 1px 32px);
  opacity:.5;
}
.band__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 28px;
}
.band__title{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(18px,2vw,24px);
  letter-spacing:-.02em;
}

/* ---------- 7. 表格 ---------- */
.board{
  width:100%;
  overflow-x:auto;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:rgba(23,28,34,.6);
}
.board table{width:100%;min-width:560px;border-collapse:collapse}
.board th,.board td{
  padding:12px 16px;
  text-align:left;
  border-bottom:1px solid var(--line);
  font-size:var(--fs-14);
  vertical-align:middle;
}
.board thead th{
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  font-weight:400;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--steel);
  background:var(--panel-2);
}
.board tbody tr:last-child td{border-bottom:0}
.board tbody tr:hover{background:rgba(55,226,213,.05)}
.board__num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:var(--steel);white-space:nowrap}
.board__status{text-align:right;width:132px;white-space:nowrap}

/* ---------- 8. 步骤手风琴 ---------- */
.steps{display:flex;flex-direction:column;gap:12px}
.step{
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:var(--panel);
  overflow:hidden;
}
.step__head{
  display:flex;
  align-items:center;
  gap:14px;
  width:100%;
  padding:16px 18px;
  text-align:left;
}
.step__num{
  flex:none;
  padding:2px 7px;
  border:1px solid rgba(255,90,33,.42);
  border-radius:4px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  color:var(--lava);
}
.step__title{flex:1;font-weight:700;font-size:var(--fs-16);color:var(--paper)}
.step__chevron{
  flex:none;
  width:9px;height:9px;
  border-right:1px solid var(--mist);
  border-bottom:1px solid var(--mist);
  transform:rotate(45deg);
  transition:transform .2s var(--ease);
}
.step__head[aria-expanded="true"] .step__chevron{transform:rotate(-135deg)}
.step__body{
  padding:16px 18px 20px;
  border-top:1px dashed var(--line);
  font-size:15px;
  line-height:1.75;
  color:#DCE2E9;
}

/* ---------- 9. 章节索引 ---------- */
.toc{
  position:sticky;
  top:calc(var(--header-h) + 24px);
  display:flex;
  flex-direction:column;
  gap:2px;
}
.toc__title{
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  font-weight:400;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--steel);
}
.toc__link{
  display:flex;
  gap:10px;
  padding:9px 12px;
  border-left:1px solid var(--line);
  font-size:13px;
  color:var(--mist);
  transition:color .18s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease),transform .18s var(--ease);
}
.toc__num{font-family:var(--font-mono);font-size:var(--fs-12);color:var(--steel)}
.toc__link:hover{color:var(--paper);transform:translateX(2px)}
.toc__link[aria-current="true"]{
  color:var(--lava);
  border-left-color:var(--lava);
  background:rgba(255,90,33,.07);
}
.toc__link[aria-current="true"] .toc__num{color:var(--lava)}

/* ---------- 10. 面包屑 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.08em;
  color:var(--mist);
}
.crumbs a:hover{color:var(--cyan)}
.crumbs__sep{color:var(--line)}
.crumbs [aria-current="page"]{color:var(--paper)}

/* ---------- 11. 图片容器 ---------- */
.media-frame{
  position:relative;
  margin:0;
  overflow:hidden;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--r-lg) var(--r-sm) var(--r-lg) var(--r-lg);
}
.media-frame img{
  width:100%;height:100%;
  object-fit:cover;
  filter:saturate(.84) contrast(1.05);
}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x5{aspect-ratio:4/5}
.media-frame--21x9{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame__grid{
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(55,226,213,.16) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(55,226,213,.16) 1px,transparent 1px);
  background-size:44px 44px;
}
.media-frame__caption{
  display:flex;
  flex-wrap:wrap;
  gap:6px 16px;
  justify-content:space-between;
  padding:12px 16px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.06em;
  color:var(--mist);
}
.media-frame--empty{
  display:grid;
  place-items:center;
  min-height:200px;
  background-image:
    linear-gradient(to right,rgba(51,60,70,.5) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(51,60,70,.5) 1px,transparent 1px);
  background-size:32px 32px;
}
.media-frame--empty::after{
  content:"坐标图待放";
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.16em;
  color:var(--steel);
}

/* ---------- 12. 筛选条 ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:10px}
.filter-chip{
  padding:7px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  font-size:13px;
  color:var(--mist);
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease),transform .18s var(--ease);
}
.filter-chip:hover{color:var(--paper);transform:translateY(-1px)}
.filter-chip[aria-pressed="true"]{
  border-color:var(--lava);
  color:var(--lava);
  background:rgba(255,90,33,.08);
}

/* ---------- 13. 显现 ---------- */
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.js .reveal.is-visible{opacity:1;transform:none}

/* ---------- 14. 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-70px;
  z-index:200;
  padding:11px 18px;
  border-radius:0 0 10px 10px;
  background:var(--lava);
  color:#0B0D11;
  font-size:var(--fs-14);
  font-weight:700;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:0}

/* ---------- 15. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg,rgba(14,17,22,.97),rgba(14,17,22,.9));
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:var(--gap);
  width:100%;
  max-width:var(--shell);
  min-height:var(--header-h);
  margin-inline:auto;
  padding-inline:var(--pad);
}
.brand{display:inline-flex;align-items:center;gap:12px;padding:6px 0}
.brand__dot{
  flex:none;
  width:10px;height:10px;
  border-radius:2px;
  background:var(--lava);
  box-shadow:0 0 0 4px rgba(255,90,33,.14);
  animation:lampPulse 2.4s ease-in-out infinite;
}
.brand__stack{display:flex;flex-direction:column;gap:2px}
.brand__cn{
  font-family:var(--font-head);
  font-weight:900;
  font-size:20px;
  letter-spacing:-.02em;
  line-height:1.1;
  color:var(--paper);
}
.brand__en{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--mist);
}
.brand--footer .brand__cn{font-size:22px}
.header-rail{
  align-self:center;
  height:8px;
  background-image:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 22px);
  opacity:.8;
}
.header-end{
  display:flex;
  align-items:center;
  justify-self:end;
  gap:clamp(14px,1.6vw,28px);
}
.site-nav{display:block}
.nav-list{display:flex;align-items:center;gap:clamp(10px,1.4vw,22px)}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:8px 2px;
  font-size:13px;
  letter-spacing:.02em;
  color:var(--mist);
  transition:color .18s var(--ease);
}
.nav-num{
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.08em;
  color:var(--steel);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:2px;
  height:1px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .2s var(--ease);
}
.nav-link:hover{color:var(--paper)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--paper)}
.nav-link[aria-current="page"]::before{
  content:"";
  width:6px;height:6px;
  border-radius:50%;
  background:var(--lava);
}
.nav-link[aria-current="page"] .nav-num{color:var(--lava)}
.header-utility{display:flex;align-items:center;gap:12px}
.lamp{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.06em;
  color:var(--mist);
  white-space:nowrap;
}
.lamp__core{
  flex:none;
  width:8px;height:8px;
  border-radius:50%;
  background:var(--turf);
  box-shadow:0 0 0 3px rgba(53,192,111,.16);
  animation:lampPulse 2.4s ease-in-out infinite;
}
.copy-chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:7px 12px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--panel);
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.06em;
  color:var(--paper);
  transition:border-color .18s var(--ease),color .18s var(--ease),background-color .18s var(--ease);
}
.copy-chip:hover{border-color:var(--cyan);color:var(--cyan)}
.copy-chip__label{color:var(--mist)}
.copy-chip:hover .copy-chip__label{color:var(--cyan)}
.copy-chip[data-copied="true"]{border-color:var(--turf);color:var(--turf)}
.copy-chip[data-copied="true"] .copy-chip__label{color:var(--turf)}
.copy-chip--wide{
  width:100%;
  max-width:320px;
  justify-content:flex-start;
  border-radius:var(--r-md);
  text-align:left;
}
.copy-chip--wide .copy-chip__value{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.12em;
  color:var(--paper);
}
.nav-toggle__lines{position:relative;width:18px;height:10px}
.nav-toggle__lines::before,
.nav-toggle__lines::after{
  content:"";
  position:absolute;
  left:0;right:0;
  height:1px;
  background:currentColor;
  transition:transform .2s var(--ease);
}
.nav-toggle__lines::before{top:0}
.nav-toggle__lines::after{bottom:0}
.nav-toggle[aria-expanded="true"]{border-color:var(--lava);color:var(--lava)}
.nav-toggle[aria-expanded="true"] .nav-toggle__lines::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__lines::after{transform:translateY(-4px) rotate(-45deg)}
.scroll-meter{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  pointer-events:none;
}
.scroll-meter__fill{
  display:block;
  width:100%;height:100%;
  transform:scaleX(0);
  transform-origin:left;
  background:linear-gradient(90deg,var(--lava),var(--signal) 55%,var(--cyan));
}
@keyframes lampPulse{
  0%,100%{opacity:.65}
  50%{opacity:1}
}

/* ---------- 16. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,10vw,140px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(23,28,34,.4),rgba(14,17,22,1));
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:1px;
  background:repeating-linear-gradient(90deg,var(--lava) 0 28px,transparent 28px 56px);
  opacity:.5;
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(260px,1.4fr) repeat(3,minmax(140px,.8fr));
  gap:clamp(24px,3vw,48px);
  padding-block:clamp(40px,6vw,72px) clamp(24px,3vw,40px);
}
.footer-brand{display:flex;flex-direction:column;gap:16px;max-width:360px}
.footer-note{font-size:13px;line-height:1.7;color:var(--mist)}
.footer-col__title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  font-weight:400;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--steel);
}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:var(--fs-14);
  color:var(--mist);
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-link::before{
  content:"";
  width:10px;height:1px;
  background:var(--line);
  transition:width .18s var(--ease),background-color .18s var(--ease);
}
.footer-link:hover{color:var(--cyan);transform:translateX(2px)}
.footer-link:hover::before{width:16px;background:var(--cyan)}
.footer-contact{padding-block:clamp(24px,3vw,40px)}
.contact-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:18px var(--gap);
  margin-bottom:16px;
}
.contact-line{display:flex;flex-direction:column;gap:2px}
.contact-line__key{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--steel);
}
.contact-line__val{font-size:var(--fs-14);color:var(--paper);word-break:break-word}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 32px;
  padding-block:22px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.04em;
  color:var(--mist);
}
.footer-year{margin-left:auto}
.to-top{
  position:fixed;
  right:clamp(14px,3vw,32px);
  bottom:clamp(14px,3vw,32px);
  z-index:70;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 16px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(23,28,34,.94);
  backdrop-filter:blur(6px);
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.1em;
  color:var(--paper);
  transition:border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.to-top:hover{border-color:var(--lava);color:var(--lava);transform:translateY(-2px)}
.to-top__arrow{
  width:8px;height:8px;
  border-left:1px solid currentColor;
  border-top:1px solid currentColor;
  transform:rotate(45deg);
}

/* ---------- 17. 响应式 ---------- */
@media (max-width:1080px){
  .grid--7-3,.grid--5-4{grid-template-columns:minmax(0,1fr)}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:minmax(240px,1fr) minmax(140px,.7fr) minmax(140px,.7fr)}
  .footer-brand{grid-column:1 / -1;max-width:none}
}

@media (max-width:900px){
  :root{--header-h:68px}
  .header-inner{
    grid-template-columns:auto auto;
    justify-content:space-between;
    gap:12px;
  }
  .header-rail{display:none}
  .header-end{gap:10px}
  .site-nav{
    position:fixed;
    top:0;right:0;bottom:0;
    z-index:55;
    width:min(88vw,340px);
    padding:calc(var(--header-h) + 24px) 22px 32px;
    background:var(--panel);
    border-left:1px solid var(--line);
    transform:translateX(103%);
    pointer-events:none;
    overflow-y:auto;
    transition:transform .3s var(--ease);
  }
  .site-nav[data-open]{transform:translateX(0);pointer-events:auto}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-item{border-bottom:1px solid var(--line)}
  .nav-link{
    justify-content:space-between;
    width:100%;
    padding:16px 4px 16px 12px;
    border-left:2px solid transparent;
    font-size:var(--fs-14);
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]::before{display:none}
  .nav-link[aria-current="page"]{
    border-left-color:var(--lava);
    background:rgba(255,90,33,.06);
  }
  .nav-toggle{display:inline-flex}
  .header-utility{gap:8px}
  .lamp{display:none}
  .section-head{grid-template-columns:minmax(0,1fr);align-items:start}
  .grid--3{grid-template-columns:minmax(0,1fr)}
  .contact-grid{grid-template-columns:minmax(0,1fr)}
  .toc{
    position:static;
    flex-direction:row;
    gap:0;
    overflow-x:auto;
    padding-bottom:6px;
    scrollbar-width:none;
  }
  .toc__title{display:none}
  .toc__link{
    border-left:0;
    border-bottom:1px solid var(--line);
    white-space:nowrap;
  }
  .toc__link[aria-current="true"]{border-bottom-color:var(--lava);background:transparent}
}

@media (max-width:720px){
  .brand__cn{font-size:17px}
  .brand__en{font-size:10px;letter-spacing:.12em}
  .btn--cta{display:none}
  .copy-chip{padding:6px 10px}
  .copy-chip__label{display:none}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:26px}
  .footer-year{margin-left:0}
  .footer-base{gap:8px 20px}
  .btn{padding:10px 16px}
  .step__head{padding:14px}
  .step__body{padding:14px 14px 18px}
}

/* ---------- 18. 减弱动效 ---------- */
@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-meter__fill{transition:none}
  .js .reveal{opacity:1;transform:none}
  .brand__dot,.lamp__core{animation:none}
}