/* =====================================================================
   JDB电子主站 · 共享站点样式  /assets/site.css
   技术蓝图 + 印刷档案：网格、刻度、坐标、展签
   ===================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --sea-900:#06233A;
  --sea-700:#0B3B5C;
  --cyan-500:#16C2D5;
  --cyan-200:#A8EDF4;
  --paper-100:#F7F1E4;
  --paper-200:#EDE3D0;
  --ink-900:#1A1410;
  --gold-500:#C9A227;
  --gold-700:#8A6F12;
  --orange-500:#F2662B;
  --orange-700:#D9531E;
  --teal-600:#0F7C7B;

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

  --fs-12:0.75rem;
  --fs-14:0.875rem;
  --fs-16:1rem;
  --fs-18:1.125rem;
  --fs-22:1.375rem;
  --fs-28:1.75rem;
  --fs-38:2.375rem;
  --fs-56:3.5rem;

  --wrap:1240px;
  --gutter:clamp(16px,4vw,40px);
  --radius:2px;

  --line-cyan:rgba(22,194,213,.38);
  --line-paper:rgba(26,20,16,.14);
  --line-sea:rgba(168,237,244,.18);

  --dur:.24s;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset 与基础 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:120px;
}
body{
  margin:0;
  background-color:var(--paper-100);
  background-image:
    linear-gradient(rgba(26,20,16,.042) 1px,transparent 1px),
    linear-gradient(90deg,rgba(26,20,16,.042) 1px,transparent 1px);
  background-size:64px 64px,64px 64px;
  color:var(--ink-900);
  font-family:var(--font-body);
  font-size:var(--fs-16);
  font-weight:400;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
img,svg,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
ul,ol{margin:0;padding:0}
p{margin:0 0 1.1em}
p:last-child{margin-bottom:0}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  letter-spacing:-.01em;
  line-height:1.2;
  margin:0;
}
h1{font-size:var(--fs-38)}
h2{font-size:var(--fs-28)}
h3{font-size:var(--fs-22)}
h4{font-size:var(--fs-18)}

:focus-visible{
  outline:2px solid var(--cyan-500);
  outline-offset:3px;
  border-radius:1px;
}

/* ---------- 3. 排版工具 ---------- */
.u-mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.u-serif{font-family:var(--font-serif);font-weight:600;letter-spacing:0}
.u-coord{
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--teal-600);
}

/* ---------- 4. 布局容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.wrap--narrow{max-width:820px}
.page-body{padding-top:clamp(26px,4vw,46px)}
.main-region{display:block;width:100%}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ---------- 5. 跳过链接与进度条 ---------- */
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-70px;
  z-index:200;
  padding:11px 20px;
  background:var(--cyan-500);
  color:var(--sea-900);
  font-size:var(--fs-14);
  font-weight:700;
  letter-spacing:.02em;
  border-radius:0 0 var(--radius) var(--radius);
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:0}

.read-progress{
  position:fixed;
  left:0;top:0;
  width:100%;height:3px;
  z-index:120;
  pointer-events:none;
  background:rgba(6,35,58,.22);
}
.read-progress > span{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--cyan-500),var(--gold-500));
  transition:width .1s linear;
}

/* ---------- 6. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:var(--sea-900);
}

/* 6.1 品牌说明层 */
.brand-bar{
  background:var(--sea-900);
  border-bottom:1px solid var(--line-cyan);
}
.brand-bar__inner{
  max-width:var(--wrap);
  margin-inline:auto;
  padding:11px var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:0;
}
.brand__mark{
  flex:none;
  font-family:var(--font-mono);
  font-size:var(--fs-14);
  font-weight:700;
  letter-spacing:.1em;
  line-height:1;
  padding:7px 10px;
  background:var(--cyan-500);
  color:var(--sea-900);
  border-radius:var(--radius);
}
.brand__text{
  display:flex;
  flex-direction:column;
  gap:3px;
  min-width:0;
}
.brand__name{
  font-family:var(--font-display);
  font-size:var(--fs-18);
  font-weight:900;
  letter-spacing:-.01em;
  line-height:1.2;
  color:var(--paper-100);
}
.brand__tagline{
  font-size:var(--fs-12);
  letter-spacing:.06em;
  line-height:1.35;
  color:var(--cyan-200);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.brand-bar__aside{
  display:flex;
  align-items:center;
  gap:14px;
  flex:none;
}

/* 6.2 编号核验位 */
.verify-chip{
  display:flex;
  flex-direction:column;
  gap:4px;
  padding:7px 13px;
  background:rgba(11,59,92,.6);
  border:1px solid var(--line-cyan);
  border-left:3px solid var(--gold-500);
  border-radius:var(--radius);
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.verify-chip:hover{
  background:rgba(22,194,213,.14);
  border-color:var(--cyan-500);
  border-left-color:var(--gold-500);
}
.verify-chip__label{
  font-family:var(--font-body);
  font-size:10px;
  letter-spacing:.16em;
  line-height:1;
  color:var(--cyan-200);
}
.verify-chip__code{
  font-family:var(--font-mono);
  font-size:var(--fs-14);
  letter-spacing:.14em;
  line-height:1;
  color:var(--gold-500);
}

/* 6.3 栏目层 */
.nav-rail{
  position:relative;
  background:var(--sea-700);
}
.nav-rail::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:3px;
  background:repeating-linear-gradient(90deg,var(--cyan-500) 0 1px,transparent 1px 12px);
  opacity:.55;
  pointer-events:none;
}
.nav-rail__inner{
  max-width:var(--wrap);
  margin-inline:auto;
  padding:10px var(--gutter) 11px;
  display:flex;
  align-items:stretch;
  justify-content:space-between;
  gap:16px;
}
.site-nav{min-width:0}
.site-nav__list{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  align-items:stretch;
  gap:0;
}
.nav-link{
  position:relative;
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:3px;
  padding:9px 15px 10px;
  border-left:2px solid transparent;
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.nav-link__coord{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  line-height:1;
  color:rgba(168,237,244,.52);
}
.nav-link__label{
  font-size:var(--fs-14);
  font-weight:700;
  letter-spacing:.01em;
  line-height:1.3;
  color:var(--paper-100);
  white-space:nowrap;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:-3px;
  top:50%;
  width:4px;height:4px;
  margin-top:-2px;
  border-radius:50%;
  background:var(--cyan-500);
  opacity:0;
  transition:opacity var(--dur) var(--ease);
}
.nav-link:hover{
  background:rgba(22,194,213,.12);
  border-left-color:var(--cyan-500);
}
.nav-link:hover .nav-link__label{color:var(--cyan-200)}
.nav-link:hover .nav-link__coord{color:var(--cyan-500)}
.nav-link:hover::after{opacity:.7}
.nav-link[aria-current="page"]{
  background:rgba(22,194,213,.18);
  border-left-color:var(--cyan-500);
}
.nav-link[aria-current="page"] .nav-link__label{color:var(--cyan-200)}
.nav-link[aria-current="page"] .nav-link__coord{color:var(--cyan-500)}
.nav-link[aria-current="page"]::after{
  opacity:1;
  animation:navPulse 2.4s ease-in-out infinite;
}

@keyframes navPulse{
  0%,100%{opacity:.35;transform:scale(.85)}
  50%{opacity:1;transform:scale(1.15)}
}

/* 6.4 移动端开关（桌面隐藏） */
.nav-toggle{display:none}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  background:var(--sea-900);
  color:var(--paper-100);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:4px;
  background:repeating-linear-gradient(90deg,var(--cyan-500) 0 1px,transparent 1px 10px);
  opacity:.7;
}
.site-footer__grid{
  max-width:var(--wrap);
  margin-inline:auto;
  padding:clamp(34px,5vw,58px) var(--gutter) 0;
  display:grid;
  gap:clamp(26px,3vw,42px);
  grid-template-columns:minmax(0,1fr) minmax(0,1.25fr) minmax(0,.9fr);
  align-items:start;
}
.footer-block{min-width:0}
.footer-block__title{
  display:flex;
  align-items:center;
  gap:9px;
  margin:0 0 15px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line-sea);
  font-family:var(--font-body);
  font-size:var(--fs-12);
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan-500);
}
.footer-block__title::before{
  content:"";
  flex:none;
  width:14px;height:1px;
  background:var(--cyan-500);
}
.footer-block__note{
  margin:14px 0 0;
  font-size:var(--fs-14);
  line-height:1.75;
  color:rgba(247,241,228,.7);
}
.footer-block__cta{margin-top:18px}

.verify-chip--footer{
  padding:13px 15px;
  gap:7px;
  background:rgba(11,59,92,.7);
  border-color:var(--line-sea);
}
.verify-chip--footer .verify-chip__code{font-size:var(--fs-18);letter-spacing:.2em}
.verify-chip--footer:hover{background:rgba(22,194,213,.14);border-color:var(--cyan-500)}

.contact-list{
  list-style:none;
  display:grid;
  gap:11px;
}
.contact-list li{
  display:grid;
  grid-template-columns:54px minmax(0,1fr) auto;
  gap:10px;
  align-items:baseline;
  padding-bottom:11px;
  border-bottom:1px dashed var(--line-sea);
}
.contact-list__key{
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.12em;
  color:var(--cyan-200);
}
.contact-list__val{
  font-size:var(--fs-14);
  line-height:1.65;
  color:var(--paper-100);
  word-break:break-word;
}
.contact-list__val--mono{
  font-family:var(--font-mono);
  letter-spacing:.02em;
  word-break:break-all;
}

.copy-btn{
  flex:none;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  line-height:1.4;
  background:transparent;
  border:1px solid var(--line-sea);
  border-radius:999px;
  color:var(--cyan-200);
  cursor:pointer;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.copy-btn:hover{
  background:rgba(22,194,213,.16);
  border-color:var(--cyan-500);
  color:var(--paper-100);
}
.copy-btn.is-done{
  background:var(--cyan-500);
  border-color:var(--cyan-500);
  color:var(--sea-900);
}

.footer-index{
  list-style:none;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:9px 18px;
}
.footer-index a{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:2px 0;
  font-size:var(--fs-14);
  color:rgba(247,241,228,.84);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-index a::before{
  content:"";
  flex:none;
  width:5px;height:5px;
  background:var(--teal-600);
  transform:rotate(45deg);
}
.footer-index a:hover{
  color:var(--cyan-200);
  border-bottom-color:var(--cyan-500);
}

.site-footer__base{
  max-width:var(--wrap);
  margin:clamp(28px,4vw,46px) auto 0;
  padding:18px var(--gutter) 28px;
  border-top:1px solid var(--line-sea);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
}
.site-footer__legal{
  margin:0;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 12px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.06em;
  color:rgba(247,241,228,.66);
}
.footer-legal-links{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:6px 18px;
}
.footer-legal-links a{
  font-size:var(--fs-12);
  color:rgba(247,241,228,.8);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-legal-links a:hover{
  color:var(--cyan-200);
  border-bottom-color:var(--cyan-500);
}

/* ---------- 8. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:9px 18px;
  font-family:var(--font-body);
  font-size:var(--fs-14);
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.45;
  text-align:center;
  border:1px solid transparent;
  border-radius:var(--radius);
  cursor:pointer;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn--primary{
  background:var(--orange-500);
  border-color:var(--orange-500);
  color:#2A1206;
}
.btn--primary:hover{
  background:var(--orange-700);
  border-color:var(--orange-700);
  transform:translateY(-1px);
}
.btn--ghost{
  background:transparent;
  border-color:var(--line-cyan);
  color:var(--cyan-200);
}
.btn--ghost:hover{
  background:rgba(22,194,213,.14);
  border-color:var(--cyan-500);
  color:var(--cyan-200);
}
.btn--outline{
  background:transparent;
  border-color:rgba(6,35,58,.34);
  color:var(--sea-900);
}
.btn--outline:hover{
  background:var(--sea-900);
  border-color:var(--sea-900);
  color:var(--paper-100);
}
.btn--quiet{
  padding:0;
  border:0;
  border-bottom:1px solid currentColor;
  border-radius:0;
  background:none;
  color:var(--teal-600);
}
.btn--quiet:hover{color:var(--orange-500)}

/* ---------- 9. 标签与展签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.08em;
  line-height:1.6;
  background:var(--paper-200);
  border:1px solid var(--line-paper);
  border-radius:999px;
  color:var(--teal-600);
}
.tag--gold{
  background:rgba(201,162,39,.1);
  border-color:var(--gold-500);
  color:var(--gold-700);
}
.tag--cyan{
  background:rgba(22,194,213,.14);
  border-color:var(--cyan-500);
  color:var(--sea-700);
}
.tag--orange{
  background:rgba(242,102,43,.1);
  border-color:var(--orange-500);
  color:#A83C0F;
}

.plate{
  position:relative;
  display:inline-flex;
  flex-direction:column;
  gap:5px;
  padding:11px 15px;
  background:var(--paper-100);
  border:1px solid var(--line-paper);
  border-left:3px solid var(--gold-500);
  border-radius:var(--radius);
  box-shadow:4px 4px 0 rgba(26,20,16,.08);
}
.plate__coord{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  line-height:1;
  color:var(--gold-700);
}
.plate__text{
  font-size:var(--fs-14);
  line-height:1.6;
  max-width:34ch;
  color:var(--ink-900);
}

/* ---------- 10. 线条 ---------- */
.rule{
  height:1px;
  border:0;
  margin:0;
  background:var(--line-paper);
}
.rule--tick{
  height:6px;
  border:0;
  margin:0;
  background-image:repeating-linear-gradient(90deg,rgba(26,20,16,.3) 0 1px,transparent 1px 10px);
}

/* ---------- 11. 面包屑与区块标头 ---------- */
.breadcrumbs{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0 0 clamp(18px,2.6vw,28px);
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.08em;
  color:var(--teal-600);
}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li + li::before{
  content:"/";
  color:rgba(26,20,16,.3);
}
.breadcrumbs a:hover{color:var(--orange-500)}
.breadcrumbs [aria-current="page"]{color:var(--ink-900)}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px 16px;
  margin-bottom:clamp(16px,2vw,22px);
}
.section-head__coord{
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.16em;
  color:var(--teal-600);
}
.section-head__title{
  margin:0;
  font-family:var(--font-display);
  font-size:var(--fs-28);
  font-weight:900;
  letter-spacing:-.01em;
  line-height:1.22;
}

/* ---------- 12. 卡片与图片容器 ---------- */
.card{
  background:var(--paper-100);
  border:1px solid var(--line-paper);
  border-radius:var(--radius);
  padding:clamp(16px,2vw,22px);
}

.media-frame{
  position:relative;
  margin:0;
  overflow:hidden;
  background:linear-gradient(140deg,var(--sea-700),var(--sea-900));
  border:1px solid var(--line-paper);
  border-radius:var(--radius);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:7px;
  border:1px solid rgba(247,241,228,.22);
  pointer-events:none;
  z-index:2;
}
.media-frame__img{
  width:100%;
  aspect-ratio:16/10;
  object-fit:cover;
  background:linear-gradient(140deg,var(--sea-700),var(--sea-900));
}
.media-frame--wide .media-frame__img{aspect-ratio:21/9}
.media-frame--tall .media-frame__img{aspect-ratio:3/4}
.media-frame__caption{
  position:relative;
  z-index:3;
  padding:9px 13px;
  border-top:1px solid var(--line-paper);
  background:var(--paper-100);
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.04em;
  line-height:1.6;
  color:var(--teal-600);
}

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

/* ---------- 14. 响应式 ---------- */
@media (max-width:1100px){
  .brand__tagline{max-width:38vw}
}

@media (max-width:900px){
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer__grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer-block--verify{grid-column:1 / -1}
}

@media (max-width:860px){
  html{scroll-padding-top:16px}
  .site-header{position:static}

  .brand-bar__inner{padding:10px var(--gutter)}
  .brand-bar__aside{gap:10px}

  /* 栏目层折叠为底部抽屉 */
  .nav-rail{
    position:fixed;
    left:0;right:0;bottom:0;
    z-index:80;
    background:transparent;
  }
  .nav-rail::before{display:none}
  .nav-rail__inner{
    max-width:none;
    margin:0;
    padding:0;
    display:flex;
    flex-direction:column;
    justify-content:flex-end;
    gap:0;
  }
  .site-nav{
    order:1;
    position:fixed;
    left:0;right:0;
    bottom:57px;
    max-height:72vh;
    overflow-y:auto;
    padding:8px var(--gutter) 20px;
    background:var(--sea-900);
    border-top:1px solid var(--line-cyan);
    transform:translateY(103%);
    visibility:hidden;
    transition:transform .28s var(--ease),visibility 0s linear .28s;
  }
  .site-header[data-open] .site-nav{
    transform:translateY(0);
    visibility:visible;
    transition:transform .28s var(--ease),visibility 0s;
  }
  .site-nav__list{
    flex-direction:column;
    flex-wrap:nowrap;
    gap:0;
  }
  .site-nav__list > li{border-bottom:1px solid var(--line-sea)}
  .site-nav__list > li:last-child{border-bottom:0}
  .nav-link{
    flex-direction:row;
    align-items:baseline;
    gap:14px;
    padding:14px 4px;
    border-left:0;
  }
  .nav-link:hover{background:rgba(22,194,213,.08);border-left:0}
  .nav-link::after{display:none}
  .nav-link__coord{width:46px;flex:none}

  .nav-toggle{
    order:2;
    display:flex;
    align-items:center;
    justify-content:center;
    gap:11px;
    width:100%;
    height:57px;
    background:var(--sea-900);
    border:0;
    border-top:1px solid var(--line-cyan);
    color:var(--paper-100);
    font-family:var(--font-body);
    font-size:var(--fs-14);
    font-weight:700;
    letter-spacing:.12em;
    cursor:pointer;
  }
  .nav-toggle__icon{
    display:inline-flex;
    flex-direction:column;
    justify-content:space-between;
    gap:4px;
    width:20px;
    height:14px;
    flex:none;
  }
  .nav-toggle__icon i{
    display:block;
    height:2px;
    background:var(--cyan-500);
    transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
  }
  .site-header[data-open] .nav-toggle__icon i:nth-child(1){transform:translateY(6px) rotate(45deg)}
  .site-header[data-open] .nav-toggle__icon i:nth-child(2){opacity:0}
  .site-header[data-open] .nav-toggle__icon i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

  body{padding-bottom:57px}
}

@media (max-width:720px){
  .brand-bar__inner{flex-wrap:wrap;justify-content:flex-start;gap:10px 14px}
  .brand-bar__aside{margin-left:auto}
  .brand__tagline{max-width:60vw}
  h1{font-size:var(--fs-28)}
  .section-head__title{font-size:var(--fs-22)}
}

@media (max-width:620px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .site-footer__grid{grid-template-columns:minmax(0,1fr)}
  .footer-block--verify{grid-column:auto}
  .contact-list li{grid-template-columns:52px minmax(0,1fr);row-gap:6px}
  .copy-btn{grid-column:2;justify-self:start}
  .site-footer__base{flex-direction:column;align-items:flex-start}
  .brand-bar__cta{padding:8px 13px;font-size:var(--fs-12)}
}

@media (max-width:420px){
  .brand__mark{font-size:12px;padding:6px 8px}
  .brand__name{font-size:var(--fs-16)}
  .brand__tagline{display:none}
  .verify-chip{padding:6px 10px}
  .verify-chip__label{display:none}
  .brand-bar__cta{display:none}
  .footer-index{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 15. 减弱动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .nav-link[aria-current="page"]::after{animation:none;opacity:1;transform:none}
  .js-reveal [data-reveal]{opacity:1;transform:none}
  .read-progress > span{transition:none}
}