/* ==========================================================================
   澳亚国际站 · /assets/site.css
   共享外壳：重置 / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   设计依据：暖纸色 × 深海蓝 × 珊瑚橙，非对称三栏与错位色块
   ========================================================================== */

/* ---------- 1. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
img,svg,video{display:block;max-width:100%;height:auto}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,dt{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
summary{display:list-item}

/* ---------- 2. 设计变量 ---------- */
:root{
  --blue-deep:#0E2A47;
  --blue-sub:#163A5F;
  --coral:#FF6B3D;
  --coral-soft:#FF8F6B;
  --paper:#F7F3EC;
  --sand:#E8DFD2;
  --mist:#C9CFD6;
  --mist-blue:#DCE6EE;
  --ink:#10161C;
  --sea:#3E9C93;

  --font-display:"Source Han Sans SC","Noto Sans CJK SC","PingFang SC","Microsoft YaHei",-apple-system,"Segoe UI",sans-serif;
  --font-body:var(--font-display);
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --max-width:1280px;
  --read-width:720px;
  --header-h:104px;
  --gutter:clamp(20px,4vw,56px);
  --radius:2px;
  --line-ink:rgba(16,22,28,.14);
  --line-paper:rgba(247,243,236,.20);
}

/* ---------- 3. 中文排版基线 ---------- */
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.08;
  letter-spacing:.02em;
}
h1{font-size:clamp(34px,5.2vw,68px)}
h2{font-size:clamp(26px,3.4vw,42px)}
h3{font-size:clamp(20px,2.2vw,26px)}
p{max-width:62ch}
strong{font-weight:700}
code,kbd,samp{font-family:var(--font-mono);font-size:.92em;letter-spacing:.04em}
::selection{background:var(--coral);color:var(--ink)}
:where(a,button,summary,[tabindex]):focus-visible{outline:2px solid var(--coral);outline-offset:2px;border-radius:1px}
main [id]{scroll-margin-top:calc(var(--header-h) + 24px)}

/* ---------- 4. 跳转链接 ---------- */
.skip-link{
  position:fixed;
  left:16px;
  top:-88px;
  z-index:200;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 20px;
  background:var(--coral);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  border-radius:var(--radius);
  transition:top .2s ease;
}
.skip-link:focus,.skip-link:focus-visible{top:12px}

/* ---------- 5. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--paper);
  border-bottom:1px solid var(--line-ink);
  transition:box-shadow .3s ease,background-color .3s ease;
}
.site-header[data-condensed="true"]{
  background:rgba(247,243,236,.96);
  box-shadow:0 18px 30px -28px rgba(14,42,71,.85);
  backdrop-filter:blur(6px);
}
.header-inner{
  width:100%;
  max-width:var(--max-width);
  margin-inline:auto;
  padding:18px var(--gutter) 16px;
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:clamp(20px,4vw,64px);
  transition:padding .3s ease;
}
.site-header[data-condensed="true"] .header-inner{padding-block:10px}

/* 品牌区 */
.brand-block{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:8px;
  min-width:0;
}
.brand{
  display:inline-flex;
  align-items:baseline;
  flex-wrap:wrap;
  gap:10px 14px;
  min-height:44px;
}
.brand__mark{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(21px,2.2vw,29px);
  letter-spacing:.08em;
  line-height:1.1;
  color:var(--ink);
  transition:font-size .3s ease;
}
.site-header[data-condensed="true"] .brand__mark{font-size:clamp(18px,1.7vw,22px)}
.brand__domain{
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:400;
  letter-spacing:.16em;
  color:var(--blue-sub);
  white-space:nowrap;
}
.brand__bookmark{
  display:inline-block;
  padding:4px 9px 3px;
  background:var(--sand);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:400;
  letter-spacing:.14em;
  border-left:2px solid var(--coral);
  line-height:1.4;
}

/* 导航区 */
.nav-block{
  display:flex;
  align-items:flex-start;
  gap:16px;
  min-width:0;
}
.site-nav{
  display:flex;
  align-items:center;
  gap:clamp(18px,2.4vw,34px);
}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:clamp(12px,1.8vw,26px);
}
.site-nav__item{display:flex}
.site-nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 2px;
  font-family:var(--font-mono);
  font-size:12.5px;
  font-weight:400;
  letter-spacing:.14em;
  color:var(--blue-deep);
  white-space:nowrap;
  transition:color .2s ease;
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:6px;
  height:2px;
  background:var(--coral);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .28s ease;
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:var(--ink)}
.site-nav__link:hover::after,.site-nav__link:focus-visible::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{font-weight:500;color:var(--ink)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav-cta{
  font-size:13px;
  letter-spacing:.08em;
  white-space:nowrap;
}

/* 移动导航按钮 */
.nav-toggle{
  position:relative;
  z-index:95;
  display:none;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:9px 13px;
  background:var(--sand);
  color:var(--blue-deep);
  border:1px solid rgba(14,42,71,.22);
  border-radius:var(--radius);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;
  height:10px;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  height:2px;
  background:currentColor;
  transition:transform .26s ease,top .26s ease;
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}

/* 阅读进度 */
.header-progress{
  position:absolute;
  left:0;
  bottom:-1px;
  width:100%;
  height:2px;
  background:linear-gradient(90deg,var(--coral) 0%,var(--coral-soft) 100%);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .12s linear;
  pointer-events:none;
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  margin-top:clamp(64px,8vw,120px);
  background:var(--paper);
  border-top:1px solid var(--line-ink);
}
.footer-blocks{
  display:grid;
  grid-template-columns:5fr 4fr 3fr;
  align-items:start;
  width:100%;
}
.footer-col{
  padding:clamp(36px,4vw,60px) clamp(22px,3vw,44px);
  min-width:0;
}
.footer-col--brand{
  background:var(--blue-deep);
  color:var(--paper);
}
.footer-col--index{
  background:var(--sand);
  color:var(--ink);
  padding-top:calc(clamp(36px,4vw,60px) + clamp(16px,2.4vw,34px));
}
.footer-col--contact{
  background:var(--blue-sub);
  color:var(--paper);
  padding-top:calc(clamp(36px,4vw,60px) + clamp(30px,4.4vw,64px));
}
.footer-brand{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(25px,3vw,36px);
  letter-spacing:.07em;
  line-height:1.1;
  color:var(--paper);
}
.footer-domain{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--coral-soft);
}
.footer-note{
  margin-top:20px;
  max-width:30ch;
  font-size:14.5px;
  line-height:1.7;
  color:rgba(247,243,236,.8);
}
.footer-icp{
  margin-top:20px;
  padding-top:14px;
  border-top:1px solid var(--line-paper);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:rgba(247,243,236,.62);
}
.footer-nav{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:clamp(20px,2.6vw,34px) clamp(18px,2.4vw,32px);
}
.footer-nav__group:last-child{grid-column:1 / -1}
.footer-nav__title{
  margin-bottom:10px;
  padding-bottom:9px;
  border-bottom:1px solid rgba(14,42,71,.24);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.22em;
  color:var(--blue-deep);
}
.footer-nav__list{display:grid;gap:0}
.footer-nav__link{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  font-size:14.5px;
  color:var(--blue-deep);
  transition:color .2s ease,padding-left .2s ease;
}
.footer-nav__link:hover,.footer-nav__link:focus-visible{color:var(--ink);padding-left:7px}
.footer-contact-title{
  margin-bottom:18px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.22em;
  color:var(--coral-soft);
}
.contact-list{display:grid;gap:14px}
.contact-list__item{display:grid;gap:3px}
.contact-list__label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  color:rgba(247,243,236,.55);
}
.contact-list__value{
  font-size:14.5px;
  line-height:1.62;
  color:var(--paper);
  overflow-wrap:anywhere;
}
.footer-base{
  background:var(--paper);
  border-top:1px solid var(--line-ink);
}
.footer-base__inner{
  max-width:var(--max-width);
  margin-inline:auto;
  padding:18px var(--gutter);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 28px;
}
.footer-sign{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  line-height:1.7;
  color:rgba(16,22,28,.66);
  max-width:none;
}
.footer-sign__sep{color:var(--coral)}

/* ---------- 7. 布局工具 ---------- */
.u-container{
  width:100%;
  max-width:var(--max-width);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.u-container--read{max-width:var(--read-width)}
.u-section{padding-block:clamp(48px,7vw,96px)}
.u-grid{display:grid;gap:clamp(20px,3vw,40px)}
.u-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.u-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* 深蓝分区 */
.surface--blue{
  position:relative;
  isolation:isolate;
  background:var(--blue-deep);
  color:var(--paper);
}
.surface--blue::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(220,230,238,.06) 0 1px,transparent 1px 7px);
}
.surface--blue p{color:rgba(247,243,236,.82)}

/* 倾斜切角装饰条 */
.tilt-strip{
  height:clamp(26px,3vw,44px);
  background:var(--coral);
  transform:rotate(-5deg);
  transform-origin:left center;
  opacity:.94;
  pointer-events:none;
}

/* ---------- 8. 通用组件 ---------- */
/* 面包屑 */
.breadcrumb{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:rgba(16,22,28,.6);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:6px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:6px}
.breadcrumb__item:not(:last-child)::after{content:"/";color:var(--coral);font-size:11px}
.breadcrumb__link{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  color:var(--blue-deep);
  transition:color .2s ease;
}
.breadcrumb__link:hover,.breadcrumb__link:focus-visible{color:var(--ink)}

/* 栏目抬头 */
.section-head{display:grid;gap:14px;max-width:var(--read-width)}
.section-head__index{
  font-family:var(--font-mono);
  font-weight:200;
  font-size:clamp(40px,6vw,72px);
  line-height:.9;
  letter-spacing:.02em;
  color:var(--coral);
}
.section-head__title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(26px,3.4vw,44px);
  line-height:1.08;
  letter-spacing:.02em;
}
.section-head__note{
  font-size:16px;
  line-height:1.75;
  color:rgba(16,22,28,.72);
  max-width:38ch;
}

/* 标记 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 10px 4px;
  border:1px solid rgba(14,42,71,.32);
  background:transparent;
  color:var(--blue-deep);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  line-height:1.5;
}
.tag--coral{background:var(--coral);border-color:var(--coral);color:var(--ink)}
.tag--sand{background:var(--sand);border-color:rgba(14,42,71,.2)}

/* 按钮 */
.btn{
  --btn-bg:var(--blue-deep);
  --btn-fg:var(--paper);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:46px;
  padding:12px 22px;
  background:var(--btn-bg);
  color:var(--btn-fg);
  border:1px solid transparent;
  border-radius:var(--radius);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:500;
  line-height:1.4;
  letter-spacing:.06em;
  text-align:center;
  transition:transform .22s ease,background-color .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.btn--coral{--btn-bg:var(--coral);--btn-fg:var(--ink);border-color:var(--coral)}
.btn--coral:hover{--btn-bg:var(--coral-soft);border-color:var(--coral-soft)}
.btn--blue{--btn-bg:var(--blue-deep);--btn-fg:var(--paper)}
.btn--blue:hover{--btn-bg:var(--blue-sub)}
.btn--ghost{--btn-bg:transparent;--btn-fg:var(--blue-deep);border-color:rgba(14,42,71,.4)}
.btn--ghost:hover{--btn-bg:var(--sand);border-color:var(--blue-deep)}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 18px -14px rgba(14,42,71,.9)}

/* 旁注卡片 */
.card{
  position:relative;
  padding:clamp(20px,2.4vw,32px);
  background:var(--sand);
  color:var(--ink);
  border:1px solid rgba(14,42,71,.16);
  box-shadow:9px 11px 0 -7px rgba(14,42,71,.1);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.card:hover{transform:translateY(-4px);border-color:var(--coral);box-shadow:11px 17px 0 -9px rgba(14,42,71,.16)}
.card--blue{
  background:var(--blue-deep);
  color:var(--paper);
  border-color:rgba(247,243,236,.18);
  box-shadow:9px 11px 0 -7px rgba(14,42,71,.4);
}
.card__label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  color:var(--blue-deep);
}
.card--blue .card__label{color:var(--coral-soft)}
.card__title{
  margin-top:10px;
  font-family:var(--font-display);
  font-weight:900;
  font-size:20px;
  line-height:1.28;
  letter-spacing:.02em;
}
.card__text{
  margin-top:8px;
  font-size:14.5px;
  line-height:1.7;
  color:rgba(16,22,28,.76);
  max-width:none;
}
.card--blue .card__text{color:rgba(247,243,236,.8)}

/* 图版容器（页面阶段放设备屏幕 / 浏览器叠层图） */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  margin:0;
  aspect-ratio:16/10;
  background:var(--mist-blue);
  border:1px solid rgba(14,42,71,.16);
}
.media-frame img,.media-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(14,42,71,.14) 0 1px,transparent 1px 46px);
  opacity:.35;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame__caption{
  display:flex;
  align-items:flex-start;
  gap:10px;
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  line-height:1.7;
  color:rgba(16,22,28,.62);
  max-width:none;
}

/* 章节索引条 */
.index-rail{
  display:grid;
  gap:0;
  border-left:1px solid rgba(14,42,71,.2);
}
.index-rail__link{
  display:flex;
  align-items:baseline;
  gap:10px;
  min-height:44px;
  margin-left:-1px;
  padding:8px 0 8px 14px;
  border-left:2px solid transparent;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:rgba(16,22,28,.6);
  transition:color .2s ease,border-color .2s ease,background-color .2s ease;
}
.index-rail__link:hover,.index-rail__link:focus-visible{color:var(--blue-deep)}
.index-rail__link[aria-current="true"]{
  color:var(--blue-deep);
  border-left-color:var(--coral);
  background:linear-gradient(90deg,rgba(255,107,61,.12),transparent 80%);
}
.index-rail__num{
  font-size:10px;
  letter-spacing:.1em;
  color:var(--coral);
}

/* 书签锚 */
.bookmark{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:6px 12px 5px;
  background:var(--blue-deep);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
}
.bookmark__num{color:var(--coral-soft);font-weight:400}

/* 标注线段落 */
.annotation{
  position:relative;
  padding-left:30px;
  font-size:14.5px;
  line-height:1.72;
  color:rgba(16,22,28,.76);
  max-width:40ch;
}
.annotation::before{
  content:"";
  position:absolute;
  left:0;
  top:.9em;
  width:20px;
  height:1px;
  background:var(--coral);
}
.annotation::after{
  content:"";
  position:absolute;
  left:0;
  top:calc(.9em - 3px);
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--coral);
}

/* 三段落切换器 */
.segmented{
  display:flex;
  flex-wrap:wrap;
  gap:2px;
  border-bottom:1px solid rgba(14,42,71,.18);
}
.segmented__btn{
  min-height:44px;
  padding:12px 18px;
  background:transparent;
  border:0;
  border-bottom:2px solid transparent;
  margin-bottom:-1px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.16em;
  color:rgba(16,22,28,.6);
  transition:color .2s ease,border-color .2s ease;
}
.segmented__btn:hover{color:var(--blue-deep)}
.segmented__btn[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--coral);font-weight:500}
.segmented__panel{padding-top:clamp(20px,2.6vw,32px)}
.segmented__panel[hidden]{display:none}

/* 折叠旁注 */
.accordion{border-top:1px solid rgba(14,42,71,.18)}
.accordion__item{border-bottom:1px solid rgba(14,42,71,.18)}
.accordion__summary{
  display:flex;
  align-items:center;
  gap:14px;
  min-height:56px;
  padding:14px 0;
  cursor:pointer;
  font-family:var(--font-body);
  font-size:16px;
  font-weight:500;
  letter-spacing:.01em;
  list-style:none;
}
.accordion__summary::-webkit-details-marker{display:none}
.accordion__summary::after{
  content:"+";
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:18px;
  color:var(--coral);
  line-height:1;
}
.accordion__item[open] .accordion__summary::after{content:"–"}
.accordion__body{
  padding:0 0 20px;
  font-size:15px;
  line-height:1.75;
  color:rgba(16,22,28,.78);
  max-width:var(--read-width);
}

/* 显现动效 */
.js [data-reveal]{
  opacity:0;
  transform:translateY(8px);
  transition:opacity .5s ease,transform .5s ease;
}
.js [data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ---------- 9. 响应式 ---------- */
@media (max-width:1180px){
  .site-nav{gap:18px}
  .site-nav__list{gap:14px}
  .site-nav__link{font-size:11.5px;letter-spacing:.1em}
  .nav-cta{font-size:12px;padding:10px 16px}
}

@media (max-width:940px){
  :root{--header-h:88px}
  .header-inner{padding-block:14px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;
    left:0;
    top:0;
    bottom:0;
    z-index:90;
    width:min(340px,86vw);
    display:flex;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    padding:104px 26px 32px;
    background:var(--blue-deep);
    color:var(--paper);
    border-right:1px solid rgba(247,243,236,.16);
    overflow-y:auto;
    visibility:hidden;
    transform:translateX(-102%);
    transition:transform .32s cubic-bezier(.3,.7,.3,1),visibility .32s step-end;
  }
  .site-nav[data-open="true"]{
    visibility:visible;
    transform:translateX(0);
    transition:transform .32s cubic-bezier(.3,.7,.3,1),visibility 0s;
  }
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .site-nav__item{border-bottom:1px solid rgba(247,243,236,.16)}
  .site-nav__link{
    display:flex;
    width:100%;
    min-height:54px;
    padding:14px 0;
    font-size:13.5px;
    letter-spacing:.18em;
    color:rgba(247,243,236,.86);
  }
  .site-nav__link::after{display:none}
  .site-nav__link:hover,.site-nav__link:focus-visible{color:var(--paper)}
  .site-nav__link[aria-current="page"]{
    color:var(--paper);
    padding-left:14px;
    box-shadow:inset 3px 0 0 var(--coral);
  }
  .nav-cta{
    width:100%;
    margin-top:26px;
    font-size:13px;
    padding:14px 18px;
  }
  .footer-blocks{grid-template-columns:1fr}
  .footer-col--index{padding-top:clamp(32px,5vw,44px)}
  .footer-col--contact{padding-top:clamp(32px,5vw,44px)}
  .footer-note{max-width:46ch}
}

@media (max-width:820px){
  .u-grid--2,.u-grid--3{grid-template-columns:1fr}
  .footer-base__inner{flex-direction:column;align-items:flex-start;gap:6px}
}

@media (max-width:560px){
  body{font-size:16px;line-height:1.72}
  .brand__domain{font-size:10.5px;letter-spacing:.12em}
  .brand__bookmark{font-size:10px;letter-spacing:.1em}
  .nav-toggle__text{font-size:10.5px}
  .footer-nav{grid-template-columns:1fr}
  .footer-nav__group:last-child{grid-column:auto}
  .section-head__note{max-width:none}
}

/* ---------- 10. 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .btn:hover,.card:hover{transform:none}
  .site-nav,.site-nav[data-open="true"]{transition:none}
}