/* ==========================================================================
   长乐坊指南 · 共享站点样式 /assets/site.css
   结构：变量 → 重置 → 中文排版 → 通用组件 → 头部轨道 → 页脚 → 动效 → 响应式
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink:#1B2429;
  --qingdai:#1E3A46;
  --qingdai-deep:#142A33;
  --qingdai-mid:#24444F;
  --slate:#4C6673;
  --cinnabar:#A63B2F;
  --cinnabar-deep:#7F261F;
  --paper:#F8F2E6;
  --paper-lift:#FFFDF8;
  --mist:#D8E5E3;
  --pine:#2E5B4E;
  --gold:#B88A3B;
  --sand:#E7D5B6;

  --font-head:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular","Cascadia Mono",monospace;

  --rail-w:88px;
  --rail-open:240px;
  --content-max:1180px;
  --gutter:clamp(18px,4vw,56px);
  --radius:16px;
  --shadow-soft:0 18px 44px -30px rgba(20,42,51,.65);
  --ease:cubic-bezier(.22,.7,.24,1);
}

/* ---------- 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,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:var(--cinnabar);text-decoration-thickness:1px;text-underline-offset:3px}
::selection{background:rgba(166,59,47,.22);color:var(--qingdai-deep)}
:focus-visible{outline:3px solid var(--cinnabar);outline-offset:3px;border-radius:6px}

/* ---------- 3. 中文排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  color:var(--ink);
  background-color:var(--paper);
  background-image:radial-gradient(rgba(76,102,115,.075) 1px,transparent 1.1px);
  background-size:22px 22px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:700;
  line-height:1.2;
  letter-spacing:.015em;
  color:var(--qingdai-deep);
}
h1{font-size:clamp(2.2rem,4.6vw,3.6rem)}
h2{font-size:clamp(1.6rem,2.8vw,2.4rem)}
h3{font-size:clamp(1.2rem,1.8vw,1.5rem)}
h4{font-size:1.05rem;letter-spacing:.04em}
p{max-width:38em}
strong{font-weight:700;color:var(--qingdai-deep)}
small{font-size:13px}
.mono{font-family:var(--font-mono);letter-spacing:.05em}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  color:var(--cinnabar);
  text-transform:uppercase;
}
.rule{height:1px;border:0;background:rgba(30,58,70,.16);margin:clamp(28px,4vw,48px) 0}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 4. 版心与页面骨架 ---------- */
.page-main{padding-top:clamp(26px,5vw,52px);padding-bottom:clamp(10px,3vw,24px)}
.content-wrap{width:min(100% - clamp(32px,6vw,80px),var(--content-max));margin-inline:auto}
.content-narrow{max-width:36em}
.band{padding:clamp(30px,5vw,64px) 0;border-top:1px solid rgba(30,58,70,.14)}
.band-head{
  display:grid;
  grid-template-columns:minmax(0,7fr) minmax(0,5fr);
  gap:clamp(14px,3vw,48px);
  align-items:end;
  margin-bottom:clamp(20px,3vw,36px);
}
.band-title{font-size:clamp(1.5rem,2.6vw,2.1rem)}
.band-note{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.05em;
  color:var(--slate);
  line-height:1.8;
}

/* ---------- 5. 按钮与标签 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:48px;padding:0 24px;
  border-radius:999px;border:1px solid transparent;
  font-family:var(--font-body);font-size:15px;font-weight:600;letter-spacing:.02em;
  text-decoration:none;cursor:pointer;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.btn-primary{background:var(--cinnabar);color:#fff}
.btn-primary:hover{background:var(--cinnabar-deep)}
.btn-gold{background:var(--gold);color:#20180a}
.btn-gold:hover{background:#c79a4b}
.btn-ghost{background:transparent;color:var(--qingdai);border-color:rgba(30,58,70,.38)}
.btn-ghost:hover{background:rgba(30,58,70,.07);border-color:var(--qingdai)}
.btn-sm{min-height:38px;padding:0 16px;font-size:13.5px}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:2px 10px;border-radius:999px;border:1px solid transparent;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;line-height:1.8;
}
.tag-red{color:#7c251b;background:rgba(166,59,47,.1);border-color:rgba(166,59,47,.35)}
.tag-pine{color:#20443a;background:rgba(46,91,78,.12);border-color:rgba(46,91,78,.34)}
.tag-gold{color:#6f5119;background:rgba(184,138,59,.16);border-color:rgba(184,138,59,.42)}
.tag-slate{color:var(--qingdai);background:rgba(76,102,115,.12);border-color:rgba(76,102,115,.34)}

/* ---------- 6. 网格与卡片 ---------- */
.grid-2,.grid-3,.grid-4{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))}
.card{
  background:var(--paper-lift);
  border:1px solid rgba(30,58,70,.16);
  border-radius:var(--radius);
  padding:clamp(18px,2.4vw,26px);
  transition:border-color .2s ease,box-shadow .2s ease,background-color .2s ease;
}
.card:hover{border-color:var(--cinnabar);box-shadow:var(--shadow-soft)}
.card-title{font-size:1.15rem;margin-bottom:8px;color:var(--qingdai-deep)}
.card-text{font-size:15px;line-height:1.8;color:#3a4a52}

/* ---------- 7. 面包屑 ---------- */
.breadcrumb{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--slate);margin-bottom:clamp(14px,2vw,24px);
}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb-list > li{display:flex;align-items:center;gap:8px}
.breadcrumb-list > li + li::before{content:"/";color:rgba(76,102,115,.45)}
.breadcrumb a{color:var(--slate);text-decoration:none}
.breadcrumb a:hover{color:var(--cinnabar);text-decoration:underline}
.breadcrumb [aria-current="page"]{color:var(--cinnabar-deep)}

/* ---------- 8. 长文与图片容器 ---------- */
.prose{max-width:36em}
.prose > * + *{margin-top:1.1em}
.prose h2{margin-top:2em}
.prose ul{list-style:none;padding-left:0}
.prose ul > li{position:relative;padding-left:1.4em}
.prose ul > li + li{margin-top:.5em}
.prose ul > li::before{
  content:"";position:absolute;left:.2em;top:.85em;
  width:6px;height:6px;border-radius:50%;background:var(--cinnabar);
}
.figure{margin:0}
.media-frame{
  position:relative;overflow:hidden;
  border-radius:var(--radius);
  border:1px solid rgba(30,58,70,.14);
  background:linear-gradient(135deg,var(--mist) 0%,#eae2cf 55%,var(--sand) 100%);
}
.media-frame::after{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:radial-gradient(rgba(30,58,70,.16) 1px,transparent 1.1px);
  background-size:16px 16px;opacity:.65;
}
.media-frame > img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame--panorama{aspect-ratio:21/9}
.figure-cap{
  margin-top:10px;font-family:var(--font-mono);
  font-size:12px;letter-spacing:.05em;color:var(--slate);
}

/* ---------- 9. 头部：左侧路径轨道 ---------- */
.site-header{
  position:fixed;
  top:0;left:0;bottom:0;
  z-index:90;
}
.skip-link{
  position:fixed;top:10px;left:10px;z-index:130;
  padding:10px 18px;border-radius:8px;
  background:var(--paper);color:var(--qingdai-deep);
  font-size:14px;font-weight:600;text-decoration:none;
  transform:translateY(-180%);
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:none}

.rail{
  position:relative;
  display:flex;flex-direction:column;
  width:var(--rail-w);height:100%;
  color:var(--paper);
  overflow:hidden;
  border-right:1px solid rgba(231,213,182,.18);
  background-image:
    radial-gradient(rgba(231,213,182,.13) 1px,transparent 1.2px),
    radial-gradient(120% 55% at 50% 0%,rgba(46,91,78,.5),transparent 64%),
    linear-gradient(180deg,var(--qingdai-mid) 0%,var(--qingdai) 45%,var(--qingdai-deep) 100%);
  background-size:14px 14px,100% 100%,100% 100%;
  transition:width .34s var(--ease),box-shadow .34s var(--ease);
}
.rail:hover,.rail:focus-within{
  width:var(--rail-open);
  box-shadow:14px 0 48px -22px rgba(20,42,51,.75);
}

.rail-progress{position:absolute;top:0;right:0;bottom:0;width:2px;background:rgba(231,213,182,.16);z-index:3}
.rail-progress-bar{
  display:block;width:100%;height:0;
  background:linear-gradient(180deg,var(--cinnabar) 0%,var(--gold) 100%);
  transition:height .12s linear;
}

.rail-brand{
  position:relative;z-index:2;
  display:grid;grid-template-columns:40px minmax(0,1fr);
  gap:10px;align-items:start;
  padding:20px 14px 18px;
  color:var(--paper);text-decoration:none;
  border-bottom:1px solid rgba(231,213,182,.16);
  flex:0 0 auto;
}
.rail-brand:hover .rail-brand-name{color:#fff}
.rail-seal{
  display:grid;place-items:center;gap:1px;
  width:40px;height:40px;padding:3px;
  border:1.5px solid var(--cinnabar);border-radius:9px;
  background:rgba(166,59,47,.18);
  font-family:var(--font-head);font-size:14px;font-weight:700;line-height:1;
  color:var(--paper);
}
.rail-brand-name{
  writing-mode:vertical-rl;
  text-orientation:upright;
  white-space:nowrap;
  font-family:var(--font-head);font-size:15px;font-weight:700;
  letter-spacing:.2em;line-height:1;
  color:var(--paper);
  transition:color .2s ease;
}
.rail-brand-tag{
  grid-column:1 / -1;
  max-height:0;opacity:0;overflow:hidden;
  font-size:11.5px;line-height:1.7;letter-spacing:.02em;
  color:rgba(248,242,230,.66);white-space:nowrap;
  transition:opacity .2s ease,max-height .3s ease;
}

.rail-nav{
  position:relative;z-index:2;
  flex:1 1 auto;min-height:0;
  padding:18px 14px 8px;
  overflow-y:auto;overflow-x:hidden;
  scrollbar-width:thin;scrollbar-color:rgba(231,213,182,.3) transparent;
}
.rail-nav-title{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  color:rgba(231,213,182,.55);
  margin:0 0 12px 5px;white-space:nowrap;
}
.rail-list{position:relative;display:flex;flex-direction:column;gap:4px}
.rail-list::before{
  content:"";position:absolute;left:22px;top:16px;bottom:16px;width:1px;
  background:repeating-linear-gradient(180deg,rgba(231,213,182,.42) 0 5px,transparent 5px 11px);
}
.rail-item{position:relative}
.rail-link{
  position:relative;
  display:flex;align-items:center;gap:12px;
  min-height:46px;padding:4px 8px;border-radius:10px;
  color:rgba(248,242,230,.8);text-decoration:none;
  transition:background-color .2s ease,color .2s ease;
}
.rail-link:hover{background:rgba(248,242,230,.09);color:#fff}
.rail-num{
  position:relative;z-index:1;flex:0 0 auto;
  display:grid;place-items:center;
  width:30px;height:30px;border-radius:50%;
  border:1px solid rgba(231,213,182,.45);
  background:var(--qingdai);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.04em;
  color:rgba(231,213,182,.92);
  transition:background-color .2s ease,border-color .2s ease,color .2s ease;
}
.rail-label{
  font-size:13.5px;line-height:1.35;white-space:nowrap;
  opacity:0;transform:translateX(-4px);
  transition:opacity .2s ease .04s,transform .24s var(--ease);
}
.rail-link[aria-current="page"]{background:rgba(166,59,47,.3);color:#fff}
.rail-link[aria-current="page"] .rail-num{
  background:var(--cinnabar);border-color:var(--cinnabar);color:#fff;
}
.rail-link[aria-current="page"]::after{
  content:"";position:absolute;left:-14px;top:50%;
  transform:translateY(-50%);
  width:4px;height:22px;border-radius:2px;background:var(--cinnabar);
}

.rail-foot{
  position:relative;z-index:2;flex:0 0 auto;
  display:flex;flex-direction:column;gap:10px;
  padding:16px 14px 22px;
  border-top:1px solid rgba(231,213,182,.16);
}
.rail-cta{
  display:flex;align-items:center;gap:10px;
  min-height:44px;padding:0 10px;border-radius:10px;
  background:var(--cinnabar);color:#fff;
  font-size:13px;font-weight:600;text-decoration:none;
  transition:background-color .2s ease;
}
.rail-cta:hover{background:var(--cinnabar-deep)}
.rail-cta-arrow{
  flex:0 0 auto;display:grid;place-items:center;
  width:24px;height:24px;font-family:var(--font-mono);font-size:14px;
}
.rail-cta-text{white-space:nowrap;opacity:0;transition:opacity .2s ease}
.rail-util{
  font-size:11px;line-height:1.7;letter-spacing:.02em;
  color:rgba(248,242,230,.64);text-decoration:none;
  white-space:nowrap;
}
.rail-util:hover{color:var(--paper);text-decoration:underline}
.rail-badge{
  display:flex;align-items:center;gap:8px;
  font-size:11px;line-height:1.7;color:rgba(203,163,86,.95);white-space:nowrap;
}
.rail-badge-dot{
  flex:0 0 auto;width:6px;height:6px;border-radius:50%;
  background:var(--gold);box-shadow:0 0 0 3px rgba(184,138,59,.22);
}
.rail-badge-text{opacity:0;transition:opacity .2s ease}

/* 轨道展开时才揭示的文字（零特异性，便于移动端覆盖） */
:where(.rail:hover,.rail:focus-within) .rail-label{opacity:1;transform:none}
:where(.rail:hover,.rail:focus-within) .rail-cta-text{opacity:1}
:where(.rail:hover,.rail:focus-within) .rail-badge-text{opacity:1}
:where(.rail:hover,.rail:focus-within) .rail-brand-tag{opacity:1;max-height:44px}

/* 移动端抽屉开关与遮罩（桌面隐藏） */
.nav-toggle{display:none}
.rail-scrim{display:none}

/* ---------- 10. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,110px);
  padding:clamp(44px,7vw,84px) 0 0;
  color:rgba(248,242,230,.82);
  overflow:hidden;
  background-image:
    radial-gradient(90% 70% at 8% 0%,rgba(46,91,78,.5),transparent 62%),
    radial-gradient(70% 60% at 100% 12%,rgba(166,59,47,.28),transparent 64%),
    linear-gradient(180deg,var(--qingdai-deep) 0%,#0E1E25 100%);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(231,213,182,.1) 1px,transparent 1.1px);
  background-size:18px 18px;opacity:.5;
}
.footer-wrap{
  position:relative;z-index:1;
  width:min(100% - clamp(32px,6vw,80px),var(--content-max));
  margin-inline:auto;
}

.footer-enterprise{
  display:grid;grid-template-columns:minmax(0,1fr) auto;
  gap:clamp(16px,3vw,40px);align-items:center;
  padding:clamp(20px,3vw,32px) clamp(18px,3vw,36px);
  margin-bottom:clamp(34px,5vw,62px);
  border:1px solid rgba(184,138,59,.45);
  border-radius:18px;
  background-image:linear-gradient(100deg,rgba(184,138,59,.22) 0%,rgba(166,59,47,.14) 58%,rgba(30,58,70,.28) 100%);
}
.footer-enterprise-kicker{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;
  color:#dfb872;margin-bottom:8px;
}
.footer-enterprise-title{
  font-family:var(--font-head);font-size:clamp(1.25rem,2.2vw,1.7rem);
  font-weight:700;line-height:1.3;color:var(--paper);
}
.footer-enterprise-text{
  margin-top:10px;font-size:14px;line-height:1.8;
  color:rgba(248,242,230,.7);max-width:34em;
}

.footer-grid{
  display:grid;
  grid-template-columns:1.35fr .85fr 1fr;
  gap:clamp(24px,4vw,56px);
  padding-bottom:clamp(30px,5vw,54px);
  border-bottom:1px solid rgba(231,213,182,.2);
}
.footer-brand-name{
  font-family:var(--font-head);font-size:1.4rem;font-weight:700;
  letter-spacing:.08em;color:var(--paper);margin-bottom:12px;
}
.footer-brand-text{font-size:14.5px;line-height:1.85;color:rgba(248,242,230,.72);max-width:26em}
.footer-update{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  margin-top:16px;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.05em;color:#dfb872;
}
.footer-update-dot{
  width:6px;height:6px;border-radius:50%;background:var(--gold);
  box-shadow:0 0 0 3px rgba(184,138,59,.22);
}
.footer-stamp{color:#f0d6a6}

.footer-dir-title,.footer-contact-title{
  font-family:var(--font-head);font-size:1rem;font-weight:700;
  letter-spacing:.1em;color:var(--paper);
  margin-bottom:14px;padding-bottom:10px;
  border-bottom:1px solid rgba(231,213,182,.22);
}
.footer-dir-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 16px}
.footer-link{
  display:inline-block;
  font-size:13.5px;line-height:2;color:rgba(248,242,230,.74);
  text-decoration:none;
  transition:color .2s ease;
}
.footer-link:hover{color:#fff;text-decoration:underline;text-decoration-color:var(--cinnabar)}
.footer-contact-list{display:flex;flex-direction:column;gap:8px;font-size:13.5px;line-height:1.8;color:rgba(248,242,230,.74)}
.footer-contact-value{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.03em;color:#f0d6a6;word-break:break-all}
.footer-note{
  margin-top:14px;font-size:12px;line-height:1.8;
  color:rgba(248,242,230,.55);max-width:30em;
}

.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;
  padding:22px 0 30px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;
  color:rgba(248,242,230,.55);
}
.footer-copy{margin:0}
.footer-icp{margin:0}
.footer-legal-links{display:flex;flex-wrap:wrap;gap:16px;margin:0}
.footer-legal-links .footer-link{font-size:12px;line-height:1.8}
.footer-legal p{max-width:none}

/* ---------- 11. 显现动效 ---------- */
html.reveal-ready [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
html.reveal-ready [data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 12. 桌面端版心偏移 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  #main-content{scroll-margin-top:24px}
}

/* ---------- 13. 平板与手机 ---------- */
@media (max-width:1023px){
  .site-header{
    position:fixed;inset:0;
    width:auto;
    pointer-events:none;
    z-index:90;
  }
  .rail{
    position:fixed;top:0;left:0;bottom:0;
    width:min(86vw,330px);
    height:100%;
    transform:translateX(-104%);
    transition:transform .34s var(--ease),box-shadow .34s var(--ease);
    pointer-events:auto;
    z-index:1;
    overflow-y:auto;
  }
  .site-header[data-open] .rail{
    transform:none;
    box-shadow:26px 0 64px -26px rgba(0,0,0,.7);
  }
  .rail,.rail:hover,.rail:focus-within{width:min(86vw,330px)}
  .rail-progress{display:none}
  .rail-brand-name{font-size:16px}
  .site-header .rail-label,
  .site-header .rail-cta-text,
  .site-header .rail-badge-text{opacity:1;transform:none}
  .site-header .rail-brand-tag{opacity:1;max-height:44px}
  .rail-util{font-size:12px}
  .rail-nav{overflow-y:auto}

  .rail-scrim{
    display:block;
    position:fixed;inset:0;z-index:0;
    background:rgba(20,42,51,.58);
    opacity:0;visibility:hidden;pointer-events:none;
    transition:opacity .3s ease,visibility .3s ease;
    pointer-events:none;
  }
  .site-header[data-open] .rail-scrim{
    opacity:1;visibility:visible;pointer-events:auto;
  }

  .nav-toggle{
    display:inline-flex;align-items:center;gap:9px;
    position:fixed;right:16px;bottom:16px;z-index:3;
    min-height:52px;padding:0 20px;
    border-radius:999px;
    border:1px solid rgba(231,213,182,.4);
    background:var(--qingdai-deep);
    color:var(--paper);
    font-size:13.5px;font-weight:600;letter-spacing:.1em;
    box-shadow:0 14px 34px -16px rgba(20,42,51,.9);
    pointer-events:auto;
    cursor:pointer;
  }
  .nav-toggle-icon{display:flex;flex-direction:column;justify-content:center;gap:4px;width:16px}
  .nav-toggle-bar{
    display:block;width:16px;height:1.5px;border-radius:1px;
    background:currentColor;
    transition:transform .25s var(--ease),opacity .2s ease;
  }
  .site-header[data-open] .nav-toggle-bar:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
  .site-header[data-open] .nav-toggle-bar:nth-child(2){opacity:0}
  .site-header[data-open] .nav-toggle-bar:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
}

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

@media (max-width:680px){
  body{font-size:16px;line-height:1.8}
  .footer-enterprise{grid-template-columns:minmax(0,1fr)}
  .footer-enterprise .btn{width:100%}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:10px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}
  .band{padding:28px 0}
}

/* ---------- 14. 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;
    scroll-behavior:auto!important;
  }
  .rail{transition:none}
  .rail:hover,.rail:focus-within{box-shadow:14px 0 48px -22px rgba(20,42,51,.75)}
  .rail-progress-bar{transition:none}
  html.reveal-ready [data-reveal],
  html.reveal-ready [data-reveal].is-revealed{opacity:1;transform:none;transition:none}
  .skip-link{transition:none}
}