/* ===== 01 重置 ===== */
*,
*::before,
*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;color-scheme:dark}
body{margin:0}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul[class],ol[class]{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
::selection{background:#2FF3C8;color:#071C18}

/* ===== 02 变量 ===== */
:root{
  --ink:#071C18;
  --ink-2:#0C2B25;
  --ink-3:#0A241F;
  --white:#F3F7F4;
  --steel:#8FA39B;
  --cyan:#2FF3C8;
  --cyan-2:#14B89A;
  --orange:#FF5A36;
  --orange-soft:#FFB39F;
  --paper:#E8EEE9;
  --shadow:#020807;
  --line:rgba(143,163,155,.26);
  --line-strong:rgba(47,243,200,.45);
  --rail:112px;
  --gutter:18px;
  --gap:clamp(16px,2.4vw,28px);
  --font-display:"Barlow Condensed","Noto Sans SC","PingFang SC","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","JetBrains Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --shadow-paper:7px 7px 0 rgba(2,8,7,.6);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ===== 03 基础排版 ===== */
body{
  min-height:100vh;
  background:var(--ink);
  color:var(--white);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.04;letter-spacing:-.01em}
h1{font-size:clamp(2.1rem,6vw,4rem)}
h2{font-size:clamp(1.5rem,3.4vw,2.25rem)}
h3{font-size:clamp(1.15rem,2.2vw,1.5rem)}
h4{font-size:1.05rem}
strong{color:var(--white);font-weight:600}
small{font-size:.8em}
#main-content{scroll-margin-top:76px}

/* ===== 04 布局工具 ===== */
.container{width:100%;max-width:1200px;margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(34px,6vw,72px)}
.grid{display:grid;gap:var(--gap)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-12{grid-column:span 12}
.divider{height:1px;background:var(--line);margin-block:clamp(20px,3vw,34px);border:0}
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.18em;text-transform:uppercase;color:var(--cyan);line-height:1.4;
}
.eyebrow::before{
  content:"";width:18px;height:8px;background:var(--cyan);
  clip-path:polygon(0 0,100% 0,86% 100%,0 100%);
}
.section-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:4px 18px;align-items:start;
  padding-bottom:14px;margin-bottom:clamp(18px,3vw,30px);
  border-bottom:1px solid var(--line);
}
.section-head__index{
  font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.16em;
  color:var(--orange);padding-top:.55em;
}
.section-head__title{font-size:clamp(1.35rem,3vw,2rem);letter-spacing:-.005em}
.section-head__note{grid-column:2;max-width:48ch;font-size:14px;line-height:1.7;color:var(--steel)}

/* ===== 05 按钮与标签 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:12px 22px;border:1px solid transparent;border-radius:0;
  font-family:var(--font-body);font-size:14px;font-weight:600;line-height:1.2;
  text-align:center;transition:background .16s var(--ease),color .16s var(--ease),
    transform .16s var(--ease),box-shadow .16s var(--ease),border-color .16s var(--ease);
}
.btn--primary{background:var(--cyan);color:var(--ink);box-shadow:5px 5px 0 rgba(2,8,7,.6)}
.btn--primary:hover,.btn--primary:focus-visible{background:#5CFBDA;transform:translate(-1px,-1px);box-shadow:7px 7px 0 rgba(2,8,7,.65)}
.btn--ghost{border-color:var(--line-strong);color:var(--cyan);background:rgba(47,243,200,.04)}
.btn--ghost:hover,.btn--ghost:focus-visible{background:rgba(47,243,200,.12);border-color:var(--cyan)}
.btn--alert{background:var(--orange);color:#1A0703;box-shadow:5px 5px 0 rgba(2,8,7,.6)}
.btn--alert:hover,.btn--alert:focus-visible{background:#FF7A5C;transform:translate(-1px,-1px);box-shadow:7px 7px 0 rgba(2,8,7,.65)}
.btn--sm{padding:8px 14px;font-size:12px}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:2px 9px;border:1px solid var(--line);
  font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.08em;
  line-height:1.7;color:var(--steel);background:rgba(143,163,155,.08);
}
.tag--accent{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}
.tag--warn{background:var(--orange-soft);border-color:var(--orange);color:#1A0703}
.tag--ghost{background:transparent;border-color:var(--line-strong);color:var(--cyan)}

/* ===== 06 卡片 / 数据条 / 表格 / 正文 ===== */
.card{
  position:relative;padding:clamp(16px,2.2vw,24px);
  background:var(--ink-2);border:1px solid var(--line);border-top:2px solid rgba(47,243,200,.5);
  transition:transform .16s var(--ease),border-color .16s var(--ease),box-shadow .16s var(--ease);
}
.card:hover{transform:translateY(-3px);border-color:rgba(47,243,200,.6);box-shadow:0 12px 26px rgba(2,8,7,.45)}
.card__index{font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.16em;color:var(--orange)}
.card__title{font-family:var(--font-display);font-size:20px;font-weight:700;line-height:1.25;margin:6px 0 8px}
.card__text{font-size:14px;line-height:1.72;color:var(--steel)}
.card__meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.data-strip{display:flex;flex-wrap:wrap;gap:10px 0}
.data-strip__item{display:flex;align-items:baseline;gap:8px;padding-inline:16px;border-left:1px solid var(--line)}
.data-strip__item:first-child{padding-left:0;border-left:0}
.data-strip__num{font-family:var(--font-mono);font-size:24px;font-weight:600;line-height:1;color:var(--cyan)}
.data-strip__label{font-size:12px;letter-spacing:.06em;color:var(--steel)}
.data-table{font-size:14px;background:rgba(12,43,37,.6);border:1px solid var(--line)}
.data-table caption{
  caption-side:top;text-align:left;padding-bottom:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--steel);
}
.data-table th,.data-table td{padding:10px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
.data-table th{
  font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.1em;
  color:var(--cyan);background:rgba(47,243,200,.06);white-space:nowrap;
}
.data-table tbody tr:hover{background:rgba(47,243,200,.05)}
.data-table td.is-num{font-family:var(--font-mono);text-align:right}
.prose{max-width:40em;font-size:16px;line-height:1.85;color:rgba(243,247,244,.88)}
.prose > * + *{margin-top:1.05em}
.prose h2{margin-top:1.9em;font-size:clamp(1.3rem,2.6vw,1.75rem)}
.prose h3{margin-top:1.5em}
.prose ul,.prose ol{padding-left:1.25em}
.prose li + li{margin-top:.4em}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(47,243,200,.45)}
.prose a:hover{border-bottom-color:var(--cyan)}
.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:6px;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--steel)}
.breadcrumbs__link{color:var(--steel);border-bottom:1px solid transparent}
.breadcrumbs__link:hover,.breadcrumbs__link:focus-visible{color:var(--cyan);border-bottom-color:rgba(47,243,200,.6)}
.breadcrumbs__sep{color:rgba(143,163,155,.55)}
.breadcrumbs__current{color:var(--white)}

/* ===== 07 图片容器基座 ===== */
.media-frame{
  position:relative;overflow:hidden;
  border:1px solid var(--line);
  background:linear-gradient(135deg,#0C2B25,#071C18 72%);
}
.media-frame--slant{clip-path:polygon(0 4%,100% 0,100% 96%,0 100%)}
.media-frame__inner{position:relative;width:100%;aspect-ratio:16/10}
.media-frame__inner::before{
  content:"";position:absolute;inset:0;z-index:0;
  background:
    repeating-linear-gradient(115deg,rgba(47,243,200,.14) 0 2px,transparent 2px 16px),
    radial-gradient(circle at 72% 28%,rgba(255,90,54,.2),transparent 62%);
}
.media-frame__inner > img,
.media-frame__inner > picture > img{
  position:relative;z-index:1;width:100%;height:100%;object-fit:cover;
}
.media-frame__caption{
  display:flex;align-items:center;gap:8px;
  padding:8px 12px;border-top:1px solid var(--line);background:rgba(2,8,7,.4);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--steel);
}
.media-frame__caption::before{
  content:"";width:10px;height:10px;flex:none;background:var(--cyan);
  clip-path:polygon(0 0,100% 50%,0 100%);
}

/* ===== 08 显现 ===== */
.js .reveal{opacity:0;transform:translateY(16px)}
.reveal{transition:opacity .5s var(--ease),transform .5s var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* ===== 09 跳转链接与焦点 ===== */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:10px 18px;background:var(--cyan);color:var(--ink);
  font-weight:700;font-size:14px;line-height:1.3;
  transform:translateY(-180%);transition:transform .18s var(--ease);
  box-shadow:5px 5px 0 rgba(2,8,7,.7);
}
.skip-link:focus,.skip-link:focus-visible{transform:none;outline:2px solid var(--white);outline-offset:2px}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* ===== 10 页头：桌面侧轨 ===== */
@media (min-width:900px){
  body{padding-left:var(--rail)}
}
.site-header{
  position:fixed;top:0;bottom:0;left:0;width:var(--rail);z-index:80;
  display:flex;flex-direction:column;align-items:stretch;gap:16px;
  padding:16px 8px 14px;
  background:linear-gradient(180deg,#0C2B25 0%,#071C18 74%);
  border-right:1px solid var(--line);
  overflow-y:auto;overflow-x:hidden;
  scrollbar-width:thin;scrollbar-color:rgba(47,243,200,.32) transparent;
}
.site-header::before{
  content:"";position:absolute;top:0;left:0;bottom:0;width:3px;
  background:linear-gradient(180deg,var(--cyan) 0%,rgba(47,243,200,0) 46%,var(--orange) 100%);
  opacity:.9;
}
.site-header::-webkit-scrollbar{width:4px}
.site-header::-webkit-scrollbar-thumb{background:rgba(47,243,200,.32)}
.brand{
  display:flex;flex-direction:column;align-items:center;gap:10px;
  padding:2px 0 8px;color:var(--white);
}
.brand__mark{
  display:grid;place-items:center;min-width:38px;padding:5px 7px;
  background:var(--cyan);color:var(--ink);
  font-family:var(--font-mono);font-size:18px;font-weight:600;line-height:1;letter-spacing:.02em;
  box-shadow:4px 4px 0 rgba(2,8,7,.72);
  transition:transform .16s var(--ease),box-shadow .16s var(--ease);
}
.brand:hover .brand__mark{transform:translate(-1px,-1px);box-shadow:6px 6px 0 rgba(2,8,7,.72)}
.brand__text{display:flex;flex-direction:column;align-items:center;gap:8px;min-width:0}
.brand__name{
  font-family:var(--font-display);font-size:14px;font-weight:800;line-height:1;
  letter-spacing:.24em;writing-mode:vertical-rl;color:var(--white);
}
.brand__tagline{display:none;font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:var(--steel)}
.site-nav{flex:1 1 auto;min-height:0}
.site-nav__list{display:flex;flex-direction:column;gap:4px}
.site-nav__item{min-width:0}
.site-nav__link{
  display:flex;flex-direction:column;align-items:center;gap:3px;
  padding:9px 4px;border:1px solid transparent;border-radius:0;
  color:var(--white);text-align:center;line-height:1.2;
  transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.site-nav__index{
  font-family:var(--font-mono);font-size:10px;font-weight:500;letter-spacing:.1em;
  color:var(--steel);transition:color .16s var(--ease);
}
.site-nav__label{font-size:12px;font-weight:500;letter-spacing:.02em}
.site-nav__link:hover,.site-nav__link:focus-visible{
  background:rgba(47,243,200,.08);border-color:rgba(47,243,200,.4);color:var(--cyan);
}
.site-nav__link:hover .site-nav__index,
.site-nav__link:focus-visible .site-nav__index{color:var(--cyan)}
.site-nav__link[aria-current="page"]{
  background:rgba(47,243,200,.13);border-color:var(--cyan);color:var(--cyan);
  box-shadow:inset 3px 0 0 0 var(--cyan);
}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--cyan)}
.nav-toggle{display:none}
.rail-meta{
  display:flex;flex-direction:column;gap:10px;
  margin-top:auto;padding-top:12px;border-top:1px solid var(--line);
}
.rail-cta{
  display:block;padding:10px 8px;text-align:center;
  background:var(--cyan);color:var(--ink);
  font-family:var(--font-mono);font-size:11px;font-weight:600;line-height:1.35;letter-spacing:.02em;
  box-shadow:4px 4px 0 rgba(2,8,7,.68);
  transition:background .16s var(--ease),transform .16s var(--ease),box-shadow .16s var(--ease);
}
.rail-cta:hover,.rail-cta:focus-visible{background:#5CFBDA;transform:translate(-1px,-1px);box-shadow:6px 6px 0 rgba(2,8,7,.72)}
.rail-status{
  padding-left:8px;border-left:2px solid rgba(255,90,54,.6);
  font-size:10px;line-height:1.55;letter-spacing:.02em;color:var(--steel);
}
@media (min-width:900px) and (max-height:820px){
  .rail-status{display:none}
}

/* ===== 11 页头：移动抽屉 ===== */
@media (max-width:899px){
  .site-header{
    position:sticky;top:0;bottom:auto;left:auto;
    width:auto;height:auto;
    flex-direction:row;align-items:center;justify-content:space-between;gap:12px;
    padding:10px 16px;
    background:#071C18;
    border-right:0;border-bottom:1px solid var(--line);
    overflow:visible;
  }
  .site-header::before{
    top:0;left:0;right:0;bottom:auto;width:100%;height:2px;
    background:linear-gradient(90deg,var(--cyan) 0%,var(--cyan-2) 46%,var(--orange) 100%);
  }
  .site-header[data-open]::after{
    content:"";position:fixed;inset:0;z-index:82;background:rgba(2,8,7,.64);
  }
  .brand{flex-direction:row;align-items:center;gap:10px;padding:0;position:relative;z-index:95}
  .brand__mark{min-width:30px;padding:4px 6px;font-size:14px;box-shadow:3px 3px 0 rgba(2,8,7,.72)}
  .brand__text{flex-direction:column;align-items:flex-start;gap:1px}
  .brand__name{writing-mode:horizontal-tb;font-size:15px;line-height:1.2;letter-spacing:.06em}
  .brand__tagline{display:block;font-size:9px;line-height:1.3;letter-spacing:.1em}
  .nav-toggle{
    position:relative;z-index:95;
    display:inline-flex;align-items:center;gap:9px;
    padding:8px 12px;border:1px solid var(--line-strong);
    background:rgba(47,243,200,.06);color:var(--cyan);
    font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.14em;
  }
  .nav-toggle:hover,.nav-toggle:focus-visible{background:rgba(47,243,200,.14);border-color:var(--cyan)}
  .nav-toggle__bars{display:grid;gap:3px;width:16px}
  .nav-toggle__bars > span{display:block;height:2px;background:currentColor;transition:transform .2s var(--ease),opacity .16s var(--ease)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(1){transform:translateY(5px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
  .nav-toggle__text{line-height:1}
  .site-nav{
    position:fixed;top:0;left:0;bottom:0;z-index:86;
    width:min(84vw,320px);padding:78px 16px 210px;
    background:var(--ink-2);border-right:1px solid var(--line);
    transform:translateX(-102%);
    transition:transform .24s var(--ease);
    overflow-y:auto;box-shadow:14px 0 34px rgba(2,8,7,.55);
  }
  .site-header[data-open] .site-nav{transform:translateX(0)}
  .site-nav__list{gap:2px}
  .site-nav__link{
    flex-direction:row;align-items:baseline;justify-content:flex-start;gap:12px;
    padding:12px 12px;text-align:left;
  }
  .site-nav__index{font-size:11px;min-width:22px}
  .site-nav__label{font-size:15px}
  .rail-meta{
    position:fixed;left:0;bottom:0;z-index:87;
    width:min(84vw,320px);margin:0;padding:14px 16px 20px;gap:8px;
    background:var(--ink-3);
    border-top:1px solid var(--line);border-right:1px solid var(--line);
    transform:translateX(-102%);
    transition:transform .24s var(--ease);
  }
  .site-header[data-open] .rail-meta{transform:translateX(0)}
  .rail-status{font-size:11px}
}

/* ===== 12 页脚：叠层纸面 ===== */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,110px);
  background:linear-gradient(180deg,#0C2B25 0%,#071C18 64%,#020807 100%);
  border-top:1px solid var(--line);
  color:var(--white);
}
.footer__rule{
  height:3px;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--cyan-2) 52%,var(--orange) 100%);
}
.footer__inner{padding-block:clamp(30px,5vw,56px) 24px}
.footer__grid{
  display:grid;grid-template-columns:1.7fr .85fr .95fr .8fr;
  gap:clamp(20px,3vw,40px);align-items:start;
}
.footer__brand{min-width:0}
.brand--stacked{flex-direction:row;align-items:center;gap:12px;padding:0}
.brand--stacked .brand__text{flex-direction:column;align-items:flex-start;gap:2px}
.brand--stacked .brand__name{writing-mode:horizontal-tb;font-size:17px;letter-spacing:.08em;line-height:1.25}
.brand--stacked .brand__tagline{display:block;font-size:10px}
.brand--stacked .brand__mark{font-size:16px;min-width:34px}
.footer__desc{margin-top:16px;max-width:26em;font-size:13px;line-height:1.72;color:var(--steel)}
.footer__strip{margin-top:18px}
.footer__col{min-width:0}
.footer__title{
  margin-bottom:12px;padding-bottom:8px;border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.2em;
  text-transform:uppercase;color:var(--steel);line-height:1.4;
}
.footer__title--ink{color:rgba(7,28,24,.55);border-bottom-color:rgba(7,28,24,.16)}
.footer__links{display:grid;gap:2px}
.footer__link{
  display:inline-block;padding:3px 0;
  font-size:14px;line-height:1.6;color:rgba(243,247,244,.82);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer__link:hover,.footer__link:focus-visible{color:var(--cyan);border-bottom-color:rgba(47,243,200,.6)}
.footer__contact{
  grid-column:1 / -1;
  margin-top:clamp(6px,2vw,18px);padding:clamp(18px,2.4vw,26px);
  display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  gap:14px 26px;align-items:start;
  background:var(--paper);color:var(--ink);
  box-shadow:var(--shadow-paper);
  position:relative;
}
.footer__contact::before{
  content:"";position:absolute;top:0;left:0;width:76px;height:4px;background:var(--orange);
}
.contact-list{display:grid;gap:10px;grid-column:span 1}
.contact-line{display:grid;grid-template-columns:5.2em minmax(0,1fr);gap:2px 10px;align-items:baseline}
.contact-line__label{
  font-family:var(--font-mono);font-size:10px;font-weight:600;letter-spacing:.14em;
  color:rgba(7,28,24,.52);line-height:1.9;
}
.contact-line__value{margin:0;font-size:13px;line-height:1.6;color:var(--ink);min-width:0}
.contact-line__value--plain{color:rgba(7,28,24,.82)}
.copy-btn{
  display:inline-flex;align-items:center;gap:8px;max-width:100%;
  padding:1px 0;border-bottom:1px dashed rgba(7,28,24,.36);
  font-family:var(--font-mono);font-size:12px;line-height:1.6;color:var(--ink);
  transition:border-color .16s var(--ease),background .16s var(--ease);
}
.copy-btn:hover,.copy-btn:focus-visible{border-bottom-color:var(--cyan-2);background:rgba(20,184,154,.12)}
.copy-btn__text{word-break:break-all;text-align:left}
.copy-btn__hint{
  flex:none;padding:1px 6px;background:rgba(7,28,24,.09);
  font-family:var(--font-body);font-size:10px;letter-spacing:.08em;color:#0C2B25;
}
.contact-note{
  margin-top:4px;padding-left:10px;border-left:2px solid rgba(255,90,54,.8);
  font-size:12px;line-height:1.7;color:rgba(7,28,24,.68);
}
.copy-status{
  grid-column:1 / -1;min-height:0;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.02em;color:#07231D;
}
.copy-status:empty{display:none}
.footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px;
  margin-top:clamp(20px,3vw,32px);padding-top:16px;border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--steel);
}
.footer__legal-links{display:flex;flex-wrap:wrap;gap:6px 16px;font-family:var(--font-body);font-size:12px}
.footer__legal-links .footer__link{padding:2px 0;font-size:12px}
.footer__top-link{
  margin-left:auto;padding-bottom:2px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--cyan);
  border-bottom:1px solid rgba(47,243,200,.5);
}
.footer__top-link:hover,.footer__top-link:focus-visible{border-bottom-color:var(--cyan);color:#5CFBDA}
@media (max-width:980px){
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__brand{grid-column:1 / -1}
  .footer__contact{grid-column:1 / -1}
}
@media (max-width:560px){
  .footer__grid{grid-template-columns:1fr}
  .footer__col{grid-column:1 / -1}
  .footer__bottom{gap:8px 14px}
  .footer__top-link{margin-left:0}
}

/* ===== 13 运行时装饰：进度条与返回顶部 ===== */
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:120;
  background:rgba(243,247,244,.08);pointer-events:none;
}
.scroll-progress__bar{
  height:100%;width:0;transform-origin:left center;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--cyan-2) 68%,var(--orange) 100%);
}
@media (min-width:900px){
  .scroll-progress{left:var(--rail)}
}
.to-top{
  position:fixed;right:16px;bottom:16px;z-index:110;
  display:grid;place-items:center;width:46px;height:46px;
  background:var(--ink-2);color:var(--cyan);
  border:1px solid var(--line-strong);
  font-family:var(--font-mono);font-size:16px;line-height:1;
  box-shadow:4px 4px 0 rgba(2,8,7,.65);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s,background .16s,color .16s;
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}
.to-top:hover,.to-top:focus-visible{background:var(--cyan);color:var(--ink);border-color:var(--cyan)}

/* ===== 14 平板与桌面列宽 ===== */
@media (min-width:760px){
  .col-3{grid-column:span 3}
  .col-4{grid-column:span 4}
  .col-5{grid-column:span 5}
  .col-6{grid-column:span 6}
  .col-7{grid-column:span 7}
  .col-8{grid-column:span 8}
}
@media (min-width:900px){
  .container{padding-inline:clamp(24px,4vw,56px)}
  :root{--gutter:24px}
}

/* ===== 15 减少动效 ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  .js .reveal,.reveal{opacity:1;transform:none}
  .card:hover{transform:none}
  .btn--primary:hover,.btn--ghost:hover,.btn--alert:hover,.rail-cta:hover{transform:none}
  .to-top{transform:none}
}