/* =========================================================
   美高CN · 共享样式 /assets/site.css
   新中式数字庭院 · 非对称编辑部版式
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,picture,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. 变量 ---------- */
:root{
  --cinnabar:#B93A32;
  --cinnabar-deep:#8E2A24;
  --ink:#141414;
  --ink-2:#2B2B2B;
  --paper:#F5F0E6;
  --mist:#EDE6D8;
  --card:#FCF9F3;
  --celadon:#6E8B7B;
  --celadon-light:#A8BFB2;
  --gold:#C9A227;
  --stone:#6B6560;
  --clay:#A65E4A;

  --line:rgba(20,20,20,.12);
  --line-strong:rgba(20,20,20,.26);
  --line-light:rgba(245,240,230,.16);

  --shell:1240px;
  --radius-s:6px;
  --radius-m:14px;
  --radius-l:26px;

  --shadow-soft:0 18px 40px -30px rgba(20,20,20,.5);
  --shadow-card:0 24px 50px -34px rgba(20,20,20,.55);

  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC",STSong,"SimSun",serif;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"DIN Alternate","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --track-wide:.16em;
  --ease:cubic-bezier(.22,.8,.28,1);
  --header-h:68px;
}

/* ---------- 3. 基础排版与页面底色 ---------- */
body{
  background-color:var(--paper);
  background-image:
    radial-gradient(1100px 620px at 88% -12%, rgba(110,139,123,.16), transparent 60%),
    radial-gradient(880px 520px at -8% 4%, rgba(185,58,50,.075), transparent 58%),
    repeating-linear-gradient(90deg, rgba(20,20,20,.026) 0 1px, transparent 1px 96px);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
@media (min-width:1024px){body{font-size:17px}}

h1,h2,h3,h4,h5,h6{font-family:var(--font-serif);font-weight:700;line-height:1.2;letter-spacing:-.01em}
h1{font-size:clamp(34px,5.4vw,64px);line-height:1.12}
h2{font-size:clamp(26px,3.4vw,40px)}
h3{font-size:clamp(20px,2.2vw,26px)}
h4{font-size:clamp(17px,1.6vw,20px)}

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

/* ---------- 4. 布局容器 ---------- */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(18px,4vw,32px)}
.section{padding-block:clamp(44px,6.5vw,84px)}
.section--tight{padding-block:clamp(26px,4vw,48px)}
.section--mist{background:var(--mist)}
.section--ink{background:var(--ink);color:var(--mist)}
.section--ink .section-title,.section--ink h2,.section--ink h3{color:var(--paper)}

.stack{display:flex;flex-direction:column;gap:clamp(12px,2vw,22px)}
.cluster{display:flex;flex-wrap:wrap;align-items:center;gap:clamp(8px,1.4vw,16px)}

/* ---------- 5. 通用文字工具 ---------- */
.eyebrow{display:inline-block;font-family:var(--font-mono);font-size:12px;letter-spacing:var(--track-wide);color:var(--celadon);text-transform:uppercase}
.mono,.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.muted{color:var(--stone)}
.text-cinnabar{color:var(--cinnabar)}
.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 6. Skip link ---------- */
.skip-link{
  position:absolute;left:18px;top:-70px;z-index:200;
  display:inline-block;padding:11px 20px;
  background:var(--ink);color:var(--paper);
  font-size:14px;letter-spacing:.08em;
  border-radius:0 0 var(--radius-s) var(--radius-s);
  transition:top .22s var(--ease);
}
.skip-link:focus{top:0}

/* ---------- 7. 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(245,240,230,.92);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  color:var(--ink);
}
.progress-rail{position:absolute;left:0;right:0;top:0;height:3px;background:rgba(20,20,20,.07);overflow:hidden}
.progress-bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cinnabar) 0%,var(--clay) 55%,var(--gold) 100%);
  transition:width .14s linear;
}

.header-inner{
  position:relative;
  max-width:var(--shell);margin-inline:auto;
  padding-inline:clamp(18px,4vw,32px);
  min-height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;
  gap:clamp(12px,3vw,40px);
}

/* 品牌 */
.header-brand{display:flex;align-items:center;min-width:0}
.brand-link{display:inline-flex;align-items:center;gap:12px;padding:9px 0;border-radius:var(--radius-s)}
.brand-seal{
  width:38px;height:38px;flex:0 0 auto;
  display:grid;place-items:center;
  background:var(--cinnabar);color:var(--paper);
  font-family:var(--font-serif);font-size:20px;font-weight:700;line-height:1;
  border-radius:8px;
  box-shadow:inset 0 0 0 1px rgba(245,240,230,.35), 0 8px 18px -10px rgba(185,58,50,.95);
  transition:background-color .22s var(--ease),transform .22s var(--ease);
}
.brand-link:hover .brand-seal{background:var(--cinnabar-deep);transform:translateY(-1px)}
.brand-lockup{display:flex;flex-direction:column;line-height:1.18;min-width:0}
.brand-name{font-family:var(--font-serif);font-weight:700;font-size:19px;letter-spacing:.03em;color:var(--ink)}
.brand-tagline{font-size:11.5px;letter-spacing:var(--track-wide);color:var(--stone);white-space:nowrap}

/* 导航 */
.site-nav{display:flex;align-items:center;gap:clamp(8px,1.4vw,22px)}
.nav-list{display:flex;align-items:center;gap:clamp(0px,.9vw,8px)}
.nav-item{display:block}
.nav-link{
  position:relative;display:inline-flex;align-items:center;
  padding:10px 10px;border-radius:var(--radius-s);
  font-size:14.5px;font-weight:500;letter-spacing:.03em;color:var(--ink-2);
  transition:color .22s var(--ease),background-color .22s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:10px;right:10px;bottom:4px;height:2px;
  background:var(--cinnabar);border-radius:2px;
  transform:scaleX(0);transform-origin:left center;
  transition:transform .3s var(--ease);
}
.nav-link:hover{color:var(--cinnabar)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--cinnabar);font-weight:700}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

/* 快线入口 */
.nav-quick{
  display:flex;align-items:center;gap:6px;
  padding-left:clamp(8px,1.4vw,20px);
  border-left:1px solid var(--line);
}
.quick-label{display:none;font-family:var(--font-mono);font-size:11px;letter-spacing:var(--track-wide);color:var(--celadon)}
.quick-link{
  font-size:12.5px;letter-spacing:.06em;color:var(--stone);
  padding:6px 10px;border-radius:999px;border:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.quick-link:hover{color:var(--cinnabar);border-color:rgba(185,58,50,.35);background:rgba(185,58,50,.06)}

/* 移动按钮 */
.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 16px;border:1px solid var(--line-strong);border-radius:999px;
  font-size:13px;letter-spacing:.1em;color:var(--ink);
  transition:border-color .22s var(--ease),color .22s var(--ease),background-color .22s var(--ease);
}
.nav-toggle:hover{border-color:var(--cinnabar);color:var(--cinnabar)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:16px;height:12px}
.nav-toggle-bars span{display:block;height:2px;width:100%;background:currentColor;border-radius:2px;transition:transform .26s var(--ease),opacity .18s linear}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) 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(-6px) rotate(-45deg)}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(48px,7vw,96px);
  padding:clamp(42px,6vw,78px) 0 28px;
  background:var(--ink);color:var(--mist);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    radial-gradient(700px 340px at 10% -6%, rgba(185,58,50,.30), transparent 62%),
    radial-gradient(560px 320px at 94% 14%, rgba(110,139,123,.24), transparent 60%),
    repeating-linear-gradient(90deg, rgba(245,240,230,.05) 0 1px, transparent 1px 108px);
}
.footer-frame{position:relative;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(18px,4vw,32px)}

.footer-top{
  display:grid;
  grid-template-columns:1.05fr 1.5fr .95fr;
  gap:clamp(24px,4vw,56px);
}
.footer-brand{min-width:0}
.footer-brand-link{display:inline-flex;align-items:center;gap:12px}
.footer-seal{
  width:44px;height:44px;flex:0 0 auto;display:grid;place-items:center;
  background:var(--cinnabar);color:var(--paper);
  font-family:var(--font-serif);font-size:22px;font-weight:700;line-height:1;
  border-radius:8px;
  box-shadow:inset 0 0 0 1px rgba(245,240,230,.35), 0 10px 24px -12px rgba(185,58,50,.9);
}
.footer-brand-name{font-family:var(--font-serif);font-size:22px;font-weight:700;letter-spacing:.05em;color:var(--paper)}
.footer-line{margin-top:16px;font-size:14.5px;line-height:1.9;color:rgba(237,230,216,.72);max-width:34ch}
.footer-meta{margin-top:12px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:var(--track-wide);color:var(--celadon-light)}

.footer-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(128px,1fr));gap:clamp(18px,2.6vw,34px)}
.footer-heading{
  font-family:var(--font-serif);font-size:14px;font-weight:700;
  letter-spacing:.14em;color:var(--paper);
  padding-bottom:10px;margin-bottom:14px;
  border-bottom:1px solid var(--line-light);
}
.footer-links{display:flex;flex-direction:column}
.footer-link{
  display:inline-block;font-size:14px;color:rgba(237,230,216,.72);
  padding:5px 0;
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer-link:hover{color:var(--gold);transform:translateX(3px)}

.footer-contact{min-width:0}
.contact-list{display:flex;flex-direction:column;gap:14px}
.contact-item{display:flex;flex-direction:column;gap:3px}
.contact-label{font-family:var(--font-mono);font-size:11px;letter-spacing:var(--track-wide);color:var(--celadon-light)}
.contact-value{font-size:14px;line-height:1.7;color:rgba(237,230,216,.86);word-break:break-word}

.footer-base{
  margin-top:clamp(30px,5vw,54px);
  padding-top:22px;
  border-top:1px solid var(--line-light);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 26px;
  font-size:13px;color:rgba(237,230,216,.6);
}
.footer-copy{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
.footer-link-sm{font-size:13px;color:rgba(237,230,216,.72);transition:color .2s var(--ease)}
.footer-link-sm:hover{color:var(--gold)}
.footer-icp{font-family:var(--font-mono);letter-spacing:.05em;color:rgba(237,230,216,.5)}

/* ---------- 9. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:12px 24px;border-radius:999px;
  font-family:var(--font-sans);font-size:15px;font-weight:500;letter-spacing:.05em;
  border:1px solid transparent;cursor:pointer;
  transition:background-color .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease),box-shadow .22s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:var(--cinnabar);color:var(--paper);box-shadow:0 14px 28px -18px rgba(185,58,50,.95)}
.btn-primary:hover{background:var(--cinnabar-deep);color:var(--paper)}
.btn-ink{background:var(--ink);color:var(--paper)}
.btn-ink:hover{background:var(--ink-2)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn-ghost:hover{border-color:var(--cinnabar);color:var(--cinnabar)}
.btn-line{background:transparent;color:var(--cinnabar);border-color:rgba(185,58,50,.4)}
.btn-line:hover{background:rgba(185,58,50,.08)}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb{margin-bottom:clamp(18px,3vw,30px)}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12.5px;letter-spacing:.06em;color:var(--stone)}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb-link{color:var(--stone);transition:color .2s var(--ease)}
.breadcrumb-link:hover{color:var(--cinnabar)}
.breadcrumb-sep{color:var(--celadon-light)}
.breadcrumb-current{color:var(--ink);font-weight:500}

/* ---------- 11. 章节抬头 ---------- */
.section-head{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,.72fr);
  gap:clamp(14px,3vw,44px);
  align-items:end;
  padding-bottom:clamp(16px,2.4vw,28px);
  border-bottom:1px solid var(--line);
  margin-bottom:clamp(24px,4vw,44px);
}
.section-kicker{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:var(--track-wide);color:var(--cinnabar);margin-bottom:10px}
.section-title{font-size:clamp(26px,3.4vw,42px);letter-spacing:-.015em}
.section-note{font-size:14.5px;line-height:1.85;color:var(--stone);max-width:46ch}

/* ---------- 12. 网格与卡片 ---------- */
.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))}
.grid-auto{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

.card{
  position:relative;
  display:flex;flex-direction:column;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  padding:clamp(18px,2.2vw,26px);
  box-shadow:var(--shadow-soft);
  transition:transform .28s var(--ease),box-shadow .28s var(--ease),border-color .28s var(--ease);
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-card);border-color:rgba(185,58,50,.28)}
.card-body{display:flex;flex-direction:column;gap:10px}
.card-title{font-family:var(--font-serif);font-size:clamp(18px,1.8vw,23px);font-weight:700;letter-spacing:-.01em;color:var(--ink)}
.card-text{font-size:14.5px;line-height:1.85;color:var(--stone)}
.card-meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--celadon)}
.card-media{margin-bottom:16px;border-radius:var(--radius-s);overflow:hidden}

/* ---------- 13. 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:999px;
  font-size:12.5px;letter-spacing:.08em;
  background:var(--mist);color:var(--ink-2);border:1px solid var(--line);
}
.tag--celadon{background:rgba(110,139,123,.14);color:#3F5A4C;border-color:rgba(110,139,123,.36)}
.tag--gold{background:rgba(201,162,39,.14);color:#7A6113;border-color:rgba(201,162,39,.42)}
.tag--clay{background:rgba(166,94,74,.13);color:#7E4132;border-color:rgba(166,94,74,.36)}
.tag--cinnabar{background:rgba(185,58,50,.12);color:var(--cinnabar-deep);border-color:rgba(185,58,50,.34)}
.tag--ink{background:var(--ink);color:var(--paper);border-color:var(--ink)}

/* ---------- 14. 图片容器（页面阶段放入 img 即可） ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--radius-m);
  background-color:var(--mist);
  background-image:repeating-linear-gradient(135deg, rgba(20,20,20,.045) 0 10px, transparent 10px 20px);
  border:1px solid var(--line);
}
.media-frame img{width:100%;height:100%;object-fit:cover;display:block}
.media-frame--empty{min-height:180px}
.media-frame--veil::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg, rgba(20,20,20,0) 38%, rgba(20,20,20,.52) 100%);
}
.media-frame--seal::before{
  content:"";position:absolute;left:14px;top:14px;z-index:2;
  width:12px;height:12px;background:var(--cinnabar);border-radius:2px;transform:rotate(45deg);
  box-shadow:0 0 0 4px rgba(245,240,230,.55);
}
.frame-16x9{aspect-ratio:16/9}
.frame-4x3{aspect-ratio:4/3}
.frame-3x4{aspect-ratio:3/4}
.frame-1x1{aspect-ratio:1/1}
@supports not (aspect-ratio:1/1){
  .frame-16x9,.frame-4x3,.frame-3x4,.frame-1x1{min-height:220px}
}
.media-caption{
  margin-top:10px;font-size:12.5px;letter-spacing:.05em;color:var(--stone);
  display:flex;align-items:center;gap:8px;
}
.media-caption::before{content:"";width:14px;height:1px;background:var(--celadon-light);flex:0 0 auto}

/* ---------- 15. 正文与分割 ---------- */
.prose{max-width:72ch;font-size:16.5px;line-height:1.85;color:#222222}
.prose p+p{margin-top:1.1em}
.prose h2{margin-top:2em;margin-bottom:.6em;font-size:clamp(22px,2.4vw,30px)}
.prose h3{margin-top:1.6em;margin-bottom:.5em;font-size:clamp(18px,1.8vw,22px)}
.prose ul,.prose ol{margin:1em 0;padding-left:1.4em}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li+li{margin-top:.4em}
.prose strong{font-weight:700;color:var(--ink)}
.prose a{color:var(--cinnabar);border-bottom:1px solid rgba(185,58,50,.35);transition:border-color .2s var(--ease)}
.prose a:hover{border-bottom-color:var(--cinnabar)}
.prose blockquote{
  margin:1.4em 0;padding:14px 20px;
  border-left:3px solid var(--celadon);
  background:var(--mist);border-radius:0 var(--radius-s) var(--radius-s) 0;
  color:var(--ink-2);font-size:15.5px;
}
.prose code{font-family:var(--font-mono);font-size:.92em;background:var(--mist);padding:2px 6px;border-radius:4px}

.rule{height:1px;border:0;background:var(--line);margin:0}
.rule--gold{background:linear-gradient(90deg,var(--gold),rgba(201,162,39,0))}
.divider-seal{display:flex;align-items:center;gap:14px;margin:clamp(28px,5vw,54px) 0}
.divider-seal::before,.divider-seal::after{content:"";height:1px;background:var(--line);flex:1 1 auto}
.divider-seal span{width:10px;height:10px;flex:0 0 auto;background:var(--cinnabar);border-radius:2px;transform:rotate(45deg)}

/* ---------- 16. 动效协议 ---------- */
.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.is-revealed{opacity:1;transform:none}
[data-chapter].is-active{position:relative}

/* ---------- 17. 响应式 ---------- */
@media (max-width:1100px){
  .nav-quick{display:none}
}
@media (max-width:1024px){
  .footer-top{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
  .footer-line{max-width:52ch}
}
@media (max-width:900px){
  :root{--header-h:62px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;flex-direction:column;align-items:stretch;gap:0;
    background:var(--ink);color:var(--paper);
    padding:12px clamp(18px,4vw,32px) 26px;
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    border-bottom:1px solid rgba(245,240,230,.14);
    box-shadow:0 34px 62px -32px rgba(0,0,0,.72);
  }
  .site-nav[data-open="true"]{display:flex;animation:nav-drop .28s var(--ease)}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-item{border-bottom:1px solid rgba(245,240,230,.12)}
  .nav-link{
    width:100%;justify-content:space-between;
    padding:16px 4px;
    font-family:var(--font-serif);font-size:17px;font-weight:700;color:var(--paper);
  }
  .nav-link::after{left:4px;right:auto;bottom:9px;width:22px}
  .nav-link:hover{color:var(--gold);background:rgba(245,240,230,.05)}
  .nav-link[aria-current="page"]{color:var(--gold)}
  .nav-link[aria-current="page"]::after{background:var(--gold);transform:scaleX(1)}
  .nav-quick{
    display:flex;flex-wrap:wrap;gap:8px;
    padding:20px 0 0;border-left:0;
  }
  .quick-label{display:block;width:100%;color:var(--celadon-light);margin-bottom:4px}
  .quick-link{color:var(--mist);border-color:rgba(245,240,230,.22);font-size:13px}
  .quick-link:hover{color:var(--gold);border-color:rgba(201,162,39,.5);background:rgba(201,162,39,.08)}

  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .section-head{grid-template-columns:minmax(0,1fr);align-items:start}
  .section-note{max-width:60ch}
}
@keyframes nav-drop{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}

@media (max-width:620px){
  .brand-tagline{display:none}
  .brand-seal{width:34px;height:34px;font-size:18px}
  .brand-name{font-size:17px}
  .nav-toggle-label{display:none}
  .nav-toggle{padding:9px 13px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}
  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand,.footer-contact{grid-column:auto}
  .footer-base{flex-direction:column;align-items:flex-start}
  .footer-legal{gap:14px}
}
@media (max-width:380px){
  .footer-cols{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 18. 降级 & 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 .reveal,.reveal{opacity:1 !important;transform:none !important}
  .progress-bar{transition:none !important}
  .card:hover,.btn:hover,.footer-link:hover{transform:none}
}