/* ============================================================
   云开KAIYUN · 共享样式 /assets/site.css
   云端看台 + 档案资料 · 深空墨蓝 / 纸白 / 云开蓝 / 曙光橙 / 薄荷绿
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink:#0B1220;
  --ink-panel:#1A2438;
  --ink-text:#111418;
  --paper:#F5F3EE;
  --paper-soft:#E6ECFF;
  --blue:#2F6BFF;
  --orange:#FF7A3D;
  --orange-deep:#C24A12;
  --mint:#35D6A4;
  --grey-blue:#6B7A99;
  --line:#C9CED8;
  --alert:#E5484D;

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

  --shell:1240px;
  --gutter:clamp(18px,4vw,48px);
  --step:24px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --radius-pill:999px;
}

/* ---------- 2. 重置 ---------- */
*,*::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[class],ol[class]{list-style:none;padding:0}
img,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}

:focus-visible{outline:3px solid var(--blue);outline-offset:3px;border-radius:4px}
.site-header :focus-visible,
.site-footer :focus-visible{outline-color:var(--orange)}

/* ---------- 3. 基础排版 ---------- */
body{
  background:var(--paper);
  color:var(--ink-text);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{color:var(--ink);font-weight:800;line-height:1.1;letter-spacing:.01em}
p{max-width:68ch}

.display-title{
  font-size:clamp(56px,10vw,148px);
  line-height:.95;
  font-weight:900;
  letter-spacing:.04em;
  color:var(--ink);
}
.section-title{
  font-size:clamp(32px,4.6vw,64px);
  line-height:1.06;
  font-weight:800;
  letter-spacing:.02em;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--blue);
}
.eyebrow::before{content:"";width:24px;height:2px;background:currentColor;flex:0 0 auto}
.lede{font-size:clamp(17px,1.5vw,21px);line-height:1.65;color:var(--grey-blue);max-width:56ch}
.prose{max-width:68ch}
.prose p+p{margin-top:1em}
.prose a{color:var(--blue);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1.5px}
.prose h3{margin-top:1.6em;margin-bottom:.5em;font-size:clamp(22px,2.4vw,28px)}
.prose ul,.prose ol{margin-top:1em;padding-left:1.4em;list-style:disc}
.prose li+li{margin-top:.4em}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.annotation{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.24em;
  color:var(--grey-blue);
}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}

/* ---------- 4. 布局骨架 ---------- */
.container{width:min(var(--shell),100%);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:calc(68ch + var(--gutter)*2)}
.section{padding-block:clamp(56px,8vw,110px)}
.section__head{display:grid;gap:14px;margin-bottom:clamp(28px,4vw,52px)}
.section--paper{background:var(--paper)}
.section--dark{background:var(--ink);color:rgba(245,243,238,.8)}
.section--dark h1,.section--dark h2,.section--dark h3,.section--dark h4{color:var(--paper)}
.section--dark .prose,.section--dark .lede{color:rgba(245,243,238,.76)}
.section--dark .eyebrow{color:var(--mint)}

.grid{display:grid;gap:clamp(18px,2.4vw,28px);grid-template-columns:repeat(12,minmax(0,1fr))}
.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}
.col-12{grid-column:span 12}

.rule{border:0;border-top:1px solid var(--line);margin-block:clamp(32px,5vw,56px)}
.rule--dashed{border-top-style:dashed}
.rule--ink{border-top-color:var(--ink)}

/* ---------- 5. 按钮 / 标签 / 卡片 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 26px;border-radius:var(--radius-pill);
  border:1px solid transparent;
  font-family:var(--font-sans);font-size:15px;font-weight:800;letter-spacing:.02em;
  cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s var(--ease),
             border-color .18s var(--ease),box-shadow .18s var(--ease),color .18s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--blue);color:#fff;box-shadow:0 16px 30px -20px rgba(47,107,255,.95)}
.btn--primary:hover{background:#2559E0}
.btn--orange{background:var(--orange);color:var(--ink-text);box-shadow:0 16px 30px -20px rgba(255,122,61,.95)}
.btn--orange:hover{background:#FF8E58}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn--ghost:hover{border-color:var(--ink);background:rgba(11,18,32,.05)}
.btn--sm{padding:10px 18px;font-size:13.5px}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:var(--radius-pill);
  font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.1em;
  background:var(--paper-soft);color:var(--ink);border:1px solid rgba(11,18,32,.08);
}
.tag--blue{background:rgba(47,107,255,.12);color:#1B4BD0;border-color:rgba(47,107,255,.32)}
.tag--orange{background:rgba(255,122,61,.16);color:var(--orange-deep);border-color:rgba(255,122,61,.36)}
.tag--mint{background:rgba(53,214,164,.16);color:#0E7D5C;border-color:rgba(53,214,164,.42)}

.card{
  position:relative;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:18px;
  padding:clamp(20px,2.4vw,30px);
  box-shadow:0 1px 0 rgba(11,18,32,.04);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.card:hover{transform:translateY(-3px);box-shadow:0 24px 44px -34px rgba(11,18,32,.6);border-color:var(--ink)}
.card__title{font-size:clamp(20px,2vw,24px);font-weight:800;line-height:1.25}
.card__meta{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  color:var(--grey-blue);margin-bottom:10px;
}
.section--dark .card{background:var(--ink-panel);border-color:rgba(201,206,216,.2);color:rgba(245,243,238,.82)}
.section--dark .card__title{color:var(--paper)}
.section--dark .card__meta{color:rgba(245,243,238,.55)}

.stat{display:flex;flex-direction:column;gap:6px}
.stat__value{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-weight:600;font-size:clamp(30px,4.4vw,54px);line-height:1;color:var(--ink);
}
.stat__label{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--grey-blue)}
.section--dark .stat__value{color:var(--paper)}
.section--dark .stat__label{color:rgba(245,243,238,.55)}

/* ---------- 6. 图片容器（页面阶段放置素材） ---------- */
.media{
  position:relative;overflow:hidden;
  border-radius:18px;
  border:1px solid var(--line);
  background:linear-gradient(150deg,#0B1220 0%,#1A2438 60%,#243352 100%);
  isolation:isolate;
}
.media img{width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--diagonal{clip-path:polygon(0 0,100% 0,100% 90%,0 100%)}
.media--placeholder{
  background-image:repeating-linear-gradient(118deg,
    rgba(47,107,255,.28) 0 14px,
    rgba(11,18,32,0) 14px 34px),
    linear-gradient(150deg,#0B1220,#1A2438);
}
.media__badge{
  position:absolute;left:14px;top:14px;z-index:2;
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--radius-pill);
  background:var(--orange);color:var(--ink-text);
  font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:.12em;
}
.media__caption{
  margin-top:10px;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.1em;color:var(--grey-blue);
}
.section--dark .media__caption{color:rgba(245,243,238,.6)}

/* ---------- 7. 面包屑 ---------- */
.breadcrumb{font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--grey-blue)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item+.breadcrumb__item::before{content:"/";color:var(--line)}
.breadcrumb__link{color:var(--grey-blue);border-bottom:1px solid transparent;transition:color .18s,border-color .18s}
.breadcrumb__link:hover{color:var(--blue);border-bottom-color:currentColor}
.breadcrumb__current{color:var(--ink);font-weight:600}

/* ---------- 8. 滚动显现 ---------- */
.js [data-reveal]{
  opacity:0;transform:translateY(20px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
  transition-delay:calc(var(--reveal-i,0) * 60ms);
}
.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 9. 跳转链接 ---------- */
.skip-link{
  position:fixed;left:50%;top:10px;z-index:200;
  transform:translate(-50%,-180%);
  padding:12px 24px;border-radius:var(--radius-pill);
  background:var(--orange);color:var(--ink-text);
  font-weight:800;font-size:14px;
  pointer-events:auto;
  transition:transform .2s var(--ease);
}
.skip-link:focus-visible{transform:translate(-50%,0);outline-color:var(--paper)}

/* ---------- 10. 头部：悬浮胶囊浮岛 ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  padding:16px var(--gutter) 0;
  pointer-events:none;
  transition:padding-top .22s var(--ease);
}
.nav-capsule{
  position:relative;
  pointer-events:auto;
  width:min(var(--shell),100%);
  margin-inline:auto;
  display:flex;align-items:center;gap:clamp(10px,2vw,26px);
  padding:10px 12px 10px 18px;
  border:1px solid rgba(201,206,216,.22);
  border-radius:var(--radius-pill);
  background:linear-gradient(118deg,rgba(11,18,32,.97) 0%,rgba(26,36,56,.96) 100%);
  box-shadow:0 22px 46px -30px rgba(11,18,32,.95),inset 0 1px 0 rgba(245,243,238,.09);
  -webkit-backdrop-filter:blur(14px) saturate(120%);
  backdrop-filter:blur(14px) saturate(120%);
  transition:padding .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.site-header[data-shrunk="true"]{padding-top:8px}
.site-header[data-shrunk="true"] .nav-capsule{
  padding-block:6px;
  border-color:rgba(47,107,255,.45);
  box-shadow:0 14px 30px -22px rgba(11,18,32,.95),inset 0 1px 0 rgba(245,243,238,.07);
}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto;min-width:0}
.brand-mark{
  position:relative;display:grid;place-items:center;
  width:40px;height:40px;flex:0 0 auto;
  border-radius:13px;
  background:linear-gradient(145deg,#3D77FF,#1B49C9);
  color:#fff;
  font-family:var(--font-mono);font-size:19px;font-weight:700;line-height:1;
  box-shadow:inset 0 0 0 1px rgba(245,243,238,.28),0 10px 20px -14px rgba(47,107,255,1);
  transform:rotate(-6deg);
  transition:transform .2s var(--ease);
}
.brand-mark::after{
  content:"";position:absolute;right:-3px;top:-3px;
  width:9px;height:9px;border-radius:3px;background:var(--orange);
}
.brand:hover .brand-mark{transform:rotate(0deg) translateY(-1px)}
.brand-text{display:flex;flex-direction:column;gap:2px;line-height:1.05;min-width:0}
.brand-name{
  font-size:17px;font-weight:900;letter-spacing:.06em;color:var(--paper);
  white-space:nowrap;
}
.brand-tagline{
  font-size:10.5px;font-weight:500;letter-spacing:.22em;
  color:rgba(245,243,238,.55);white-space:nowrap;
  transition:opacity .2s var(--ease),transform .2s var(--ease);
}
.site-header[data-shrunk="true"] .brand-tagline{opacity:0;transform:translateY(4px)}

/* 导航 */
.primary-nav{display:flex;align-items:center;gap:6px;margin-left:auto;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  display:inline-block;
  padding:9px 14px;border-radius:var(--radius-pill);
  font-size:15px;font-weight:600;letter-spacing:.02em;
  color:rgba(245,243,238,.7);
  transition:color .18s var(--ease),background-color .18s var(--ease),box-shadow .18s var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(245,243,238,.08)}
.nav-link[aria-current="page"]{
  color:var(--paper);
  background:rgba(47,107,255,.22);
  box-shadow:inset 0 0 0 1px rgba(47,107,255,.6);
}
.nav-link[aria-current="page"]::after{
  content:"";display:inline-block;width:5px;height:5px;margin-left:8px;
  border-radius:50%;background:var(--orange);vertical-align:middle;
}
.nav-cta{
  display:inline-flex;align-items:center;gap:8px;
  margin-left:8px;padding:11px 20px;
  border-radius:var(--radius-pill);
  background:var(--orange);color:var(--ink-text);
  font-size:14px;font-weight:900;letter-spacing:.03em;white-space:nowrap;
  box-shadow:0 12px 24px -16px rgba(255,122,61,1);
  transition:background-color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease);
}
.nav-cta:hover{background:#FF8E58;transform:translateY(-2px);box-shadow:0 18px 30px -16px rgba(255,122,61,1)}
.nav-cta__arrow{font-family:var(--font-mono);font-size:14px;transition:transform .18s var(--ease)}
.nav-cta:hover .nav-cta__arrow{transform:translateX(3px)}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  margin-left:auto;
  padding:9px 14px;
  border:1px solid rgba(245,243,238,.26);
  border-radius:var(--radius-pill);
  color:var(--paper);
  font-size:13px;font-weight:700;letter-spacing:.1em;
  cursor:pointer;
  transition:background-color .18s var(--ease),border-color .18s var(--ease);
}
.nav-toggle:hover{background:rgba(245,243,238,.1)}
.nav-toggle[aria-expanded="true"]{background:rgba(47,107,255,.3);border-color:rgba(47,107,255,.7)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bars span{
  display:block;height:2px;width:100%;border-radius:2px;background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-3px) rotate(-45deg)}

/* 滚动进度线 */
.nav-progress{
  position:absolute;left:32px;right:32px;bottom:0;height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--orange),var(--mint));
  transform:scaleX(0);transform-origin:0 50%;
  pointer-events:none;
}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,9vw,120px);
  background:var(--ink);
  color:rgba(245,243,238,.78);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:6px;
  background:linear-gradient(90deg,var(--blue) 0 38%,var(--orange) 38% 62%,var(--mint) 62% 100%);
}
.site-footer::after{
  content:"";position:absolute;right:-120px;top:-120px;
  width:340px;height:340px;border-radius:50%;
  background:radial-gradient(circle,rgba(47,107,255,.24),transparent 68%);
  pointer-events:none;
}
.footer-inner{
  position:relative;z-index:1;
  width:min(var(--shell),100%);
  margin-inline:auto;
  padding:clamp(48px,7vw,88px) var(--gutter) clamp(30px,4vw,48px);
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,.75fr) minmax(0,.8fr) minmax(0,1.35fr);
  gap:clamp(28px,4vw,56px);
}
.footer-brand{position:relative;display:flex;flex-direction:column;align-items:flex-start;gap:16px;padding-right:28px}
.brand--footer{gap:14px}
.brand--footer .brand-mark{width:46px;height:46px;border-radius:15px;font-size:22px}
.brand--footer .brand-name{font-size:clamp(22px,2.6vw,30px);letter-spacing:.04em}
.footer-tagline{
  font-size:15px;font-weight:600;letter-spacing:.14em;
  color:rgba(245,243,238,.72);max-width:none;
}
.footer-status{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 13px;border-radius:var(--radius-pill);
  border:1px solid rgba(201,206,216,.22);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  color:rgba(245,243,238,.66);
}
.status-dot{
  width:7px;height:7px;border-radius:50%;background:var(--mint);
  box-shadow:0 0 0 3px rgba(53,214,164,.18);
  animation:pulse 2.6s var(--ease) infinite;
}
@keyframes pulse{0%,100%{box-shadow:0 0 0 3px rgba(53,214,164,.18)}50%{box-shadow:0 0 0 6px rgba(53,214,164,.06)}}
.footer-vertical{
  position:absolute;right:0;top:6px;
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.3em;
  color:rgba(245,243,238,.4);
  border-left:1px solid rgba(201,206,216,.18);
  padding-left:10px;
}
.footer-col{min-width:0}
.footer-col__title{
  display:flex;align-items:center;gap:10px;
  font-size:13px;font-weight:800;letter-spacing:.18em;
  color:var(--paper);
}
.footer-col__title::before{content:"";width:14px;height:2px;background:var(--orange);flex:0 0 auto}
.footer-links{display:grid;gap:11px;margin-top:20px;font-size:15px}
.footer-links a{
  display:inline-flex;align-items:center;gap:0;
  color:rgba(245,243,238,.7);
  transition:color .18s var(--ease),gap .18s var(--ease);
}
.footer-links a::before{
  content:"";width:0;height:1px;background:var(--orange);
  transition:width .2s var(--ease),margin-right .2s var(--ease);
}
.footer-links a:hover{color:var(--paper)}
.footer-links a:hover::before{width:12px;margin-right:8px}

.contact-list{display:grid;gap:14px;margin-top:20px}
.contact-row{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;
  gap:12px;align-items:start;
  padding-bottom:12px;
  border-bottom:1px dashed rgba(201,206,216,.22);
}
.contact-key{
  font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.16em;color:var(--mint);padding-top:4px;
}
.contact-val{font-size:14.5px;line-height:1.65;color:rgba(245,243,238,.86);word-break:break-word}
.copy-btn{
  padding:5px 11px;border-radius:var(--radius-pill);
  border:1px solid rgba(201,206,216,.32);
  background:rgba(245,243,238,.04);
  color:rgba(245,243,238,.72);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  cursor:pointer;white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.copy-btn:hover{border-color:var(--mint);color:var(--mint)}
.copy-btn[data-copied="true"]{background:var(--mint);border-color:var(--mint);color:var(--ink-text)}
.footer-note{
  margin-top:16px;max-width:36ch;
  font-size:12.5px;line-height:1.7;color:rgba(245,243,238,.5);
}
.footer-legal{
  position:relative;z-index:1;
  width:min(var(--shell),100%);
  margin-inline:auto;
  padding:18px var(--gutter) 40px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 28px;
  border-top:1px solid rgba(201,206,216,.18);
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;
  color:rgba(245,243,238,.55);
}
.footer-legal p{max-width:none}
.legal-links{display:flex;flex-wrap:wrap;gap:18px}
.legal-links a{color:rgba(245,243,238,.6);transition:color .18s var(--ease)}
.legal-links a:hover{color:var(--orange)}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1180px){
  .nav-link{padding:9px 11px;font-size:14px}
  .nav-cta{padding:10px 16px;font-size:13.5px}
  .brand-tagline{display:none}
}

@media (max-width:1023px){
  .footer-inner{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(26px,4vw,40px)}
  .footer-brand{grid-column:1 / -1;padding-right:0}
  .footer-vertical{display:none}
  .col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 6}
}

@media (max-width:900px){
  .site-header{padding-top:12px}
  .nav-capsule{padding:8px 10px 8px 14px;gap:10px}
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:absolute;left:0;right:0;top:calc(100% + 10px);
    display:flex;flex-direction:column;align-items:stretch;gap:6px;
    margin:0;padding:14px;
    border-radius:26px;
    border:1px solid rgba(201,206,216,.22);
    background:linear-gradient(160deg,#0B1220,#1A2438);
    box-shadow:0 34px 60px -34px rgba(11,18,32,.95);
    max-height:calc(100dvh - 130px);overflow:auto;
    visibility:hidden;opacity:0;pointer-events:none;
    transform:translateY(-8px) scale(.985);
    transition:opacity .18s var(--ease),transform .18s var(--ease),visibility .18s var(--ease);
  }
  .primary-nav[data-open="true"]{
    visibility:visible;opacity:1;pointer-events:auto;transform:translateY(0) scale(1);
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{display:block;padding:13px 16px;font-size:16px;border-radius:14px}
  .nav-link[aria-current="page"]{box-shadow:inset 0 0 0 1px rgba(47,107,255,.6)}
  .nav-cta{margin:10px 2px 2px;justify-content:center;padding:15px;font-size:15px}
  .nav-progress{left:24px;right:24px;bottom:4px}
}

@media (max-width:640px){
  body{font-size:16px}
  .brand-mark{width:36px;height:36px;border-radius:12px;font-size:17px}
  .brand-name{font-size:15.5px;letter-spacing:.04em}
  .nav-toggle__text{display:none}
  .nav-toggle{padding:10px}
  .footer-inner{grid-template-columns:minmax(0,1fr)}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:10px}
  .contact-row{grid-template-columns:minmax(0,1fr) auto;gap:6px 12px}
  .contact-key{grid-column:1 / -1;padding-top:0}
  .annotation{writing-mode:horizontal-tb;letter-spacing:.14em}
  .col-4,.col-5,.col-6,.col-7,.col-8,.col-12{grid-column:span 12}
}

/* ---------- 13. 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;
  }
  .js [data-reveal]{opacity:1;transform:none;transition:none}
  .status-dot{animation:none}
  .btn:hover,.card:hover,.nav-cta:hover,.brand:hover .brand-mark{transform:none}
}