/* =========================================================
   PG娱乐中心 · 官方中文站 共享样式 /assets/site.css
   档案索引 × 测试终端：墨蓝底、年份色带、框架式导航
   ========================================================= */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink:#0B1B2B;
  --hull:#12293F;
  --hull-deep:#0D2032;

  --amber:#F0B429;
  --cyan:#2FE0C8;
  --steel:#7C8CA8;
  --teal:#37B6A0;
  --ember:#E08A3C;
  --paper:#E8EEF6;
  --mist:#9FB3C8;
  --ok:#4ADE80;
  --alert:#F2789F;

  --line:rgba(124,140,168,.26);
  --line-soft:rgba(124,140,168,.14);
  --line-cyan:rgba(47,224,200,.42);
  --line-amber:rgba(240,180,41,.42);

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

  --r-s:8px;
  --r-m:16px;
  --r-l:26px;
  --r-pill:999px;

  --shadow:0 20px 48px rgba(3,10,20,.52);
  --shadow-soft:0 12px 30px rgba(3,10,20,.38);
  --ease:cubic-bezier(.22,.7,.3,1);

  --gutter:clamp(1.1rem,4vw,2.6rem);
  --page-max:1240px;
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0;}
.nav-list,.footer-links{list-style:none;margin:0;padding:0;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
img,picture,svg,video{max-width:100%;display:block;}
table{border-collapse:collapse;width:100%;}

/* ---------- 3. 基础与背景节奏 ---------- */
body{
  min-height:100vh;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(124,140,168,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(124,140,168,.05) 1px,transparent 1px),
    radial-gradient(1100px 560px at 78% -10%,rgba(47,224,200,.10),transparent 62%),
    radial-gradient(880px 520px at -8% 6%,rgba(240,180,41,.07),transparent 58%),
    radial-gradient(820px 620px at 50% 104%,rgba(55,182,160,.07),transparent 60%);
  background-size:72px 72px,72px 72px,auto,auto,auto;
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.85;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

::selection{background:rgba(240,180,41,.32);color:#fff;}

:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:6px;
}

#main-content:focus{outline:none;}

/* ---------- 4. 排版 ---------- */
h1,h2,h3,h4,h5,h6{font-weight:800;line-height:1.3;letter-spacing:-.02em;}
h1{font-size:clamp(2.6rem,7vw,6rem);font-weight:900;line-height:1.04;letter-spacing:-.03em;}
h2{font-size:clamp(1.7rem,3.6vw,2.5rem);}
h3{font-size:clamp(1.15rem,2vw,1.45rem);}
h4{font-size:1.05rem;}

.mono{
  font-family:var(--font-mono);
  font-weight:500;
  letter-spacing:.08em;
  font-variant-numeric:tabular-nums;
}

.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:.76rem;
  font-weight:600;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--amber);
}

.prose{max-width:72ch;}
.prose p{margin-bottom:1.1em;}
.prose p:last-child{margin-bottom:0;}
.prose strong{color:#fff;font-weight:700;}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(47,224,200,.4);}
.prose a:hover{border-bottom-color:var(--cyan);}
.prose ul,.prose ol{margin:0 0 1.1em 1.25em;padding-left:1.05em;}
.prose ul{list-style:disc;}
.prose ol{list-style:decimal;}

.prose-lead{
  font-family:var(--font-serif);
  font-size:1.12rem;
  line-height:1.95;
  color:#D7E2F0;
}

/* ---------- 5. 布局容器与栅格 ---------- */
.container{
  width:min(var(--page-max),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
}

.section{padding:clamp(2.2rem,5vw,4.4rem) 0;}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:.9rem 1.6rem;
  padding-bottom:.9rem;
  margin-bottom:1.6rem;
  border-bottom:1px solid var(--line);
}
.section-title{font-size:clamp(1.5rem,3.2vw,2.25rem);font-weight:900;letter-spacing:-.025em;}
.section-lead{color:var(--mist);font-size:1rem;max-width:58ch;}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(1rem,2vw,1.6rem);
}
.col-3{grid-column:span 3;}
.col-4{grid-column:span 4;}
.col-6{grid-column:span 6;}
.col-8{grid-column:span 8;}
.col-9{grid-column:span 9;}
.col-12{grid-column:span 12;}

.grid-2,.grid-3{display:grid;gap:clamp(1rem,2.2vw,1.7rem);}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));}

.divider{
  height:1px;
  border:0;
  margin:clamp(1.6rem,3vw,2.6rem) 0;
  background:linear-gradient(90deg,var(--line-amber),var(--line),transparent);
}

.visually-hidden{
  position:absolute !important;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

/* ---------- 6. 面包屑 ---------- */
.breadcrumbs{padding:clamp(1rem,2.4vw,1.8rem) 0 .2rem;}
.breadcrumbs-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.4rem;
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.1em;
  color:var(--steel);
}
.breadcrumbs-item{display:inline-flex;align-items:center;gap:.4rem;}
.breadcrumbs-item::after{content:"/";color:rgba(124,140,168,.55);}
.breadcrumbs-item:last-child::after{content:"";}
.breadcrumbs-item a{color:var(--cyan);}
.breadcrumbs-item a:hover{color:#fff;}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.62rem 1.15rem;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-size:.92rem;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.4;
  text-align:center;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn:hover{transform:translateY(-2px);}
.btn:active{transform:translateY(0);}

.btn-amber{
  background:linear-gradient(135deg,var(--amber),#D89C14);
  color:#0B1B2B;
  box-shadow:0 8px 20px rgba(240,180,41,.24);
}
.btn-amber:hover{box-shadow:0 14px 28px rgba(240,180,41,.34);}

.btn-ghost{
  background:rgba(47,224,200,.07);
  color:var(--cyan);
  border-color:var(--line-cyan);
}
.btn-ghost:hover{background:rgba(47,224,200,.16);}

.btn-quiet{
  background:transparent;
  color:var(--mist);
  border-color:var(--line);
}
.btn-quiet:hover{color:var(--paper);border-color:var(--line-cyan);}

/* ---------- 8. 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.32rem;
  padding:.22rem .6rem;
  border:1px solid currentColor;
  border-radius:var(--r-pill);
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:600;
  letter-spacing:.1em;
  line-height:1.55;
  white-space:nowrap;
}
.tag-2023{color:var(--steel);background:rgba(124,140,168,.12);}
.tag-2024{color:var(--teal);background:rgba(55,182,160,.12);}
.tag-2025{color:var(--ember);background:rgba(224,138,60,.14);}

/* ---------- 9. 卡片 ---------- */
.card{
  position:relative;
  padding:clamp(1.05rem,2.2vw,1.7rem);
  border:1px solid var(--line);
  border-radius:var(--r-m);
  background:linear-gradient(160deg,rgba(18,41,63,.92),rgba(11,27,43,.86));
  transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.card:hover{
  transform:translateY(-4px);
  border-color:var(--line-cyan);
  box-shadow:var(--shadow);
}
.card-head{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.6rem;
  margin-bottom:.7rem;
}
.card-title{font-size:1.1rem;font-weight:800;letter-spacing:-.01em;}
.card-meta{
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.1em;
  color:var(--steel);
}
.card-text{color:var(--mist);font-size:.96rem;}

/* ---------- 10. 折叠组 ---------- */
.accordion{
  border:1px solid var(--line);
  border-radius:var(--r-m);
  background:rgba(18,41,63,.55);
  overflow:hidden;
}
.accordion-item + .accordion-item{border-top:1px solid var(--line);}
.accordion-trigger{
  display:flex;
  width:100%;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding:1rem 1.2rem;
  text-align:left;
  font-size:1.02rem;
  font-weight:700;
  color:var(--paper);
  transition:background-color .2s var(--ease),color .2s var(--ease);
}
.accordion-trigger:hover{background:rgba(47,224,200,.07);color:var(--cyan);}
.accordion-trigger::after{
  content:"+";
  flex:none;
  font-family:var(--font-mono);
  font-size:1.15rem;
  color:var(--cyan);
  transition:transform .24s var(--ease);
}
.accordion-trigger[aria-expanded="true"]::after{content:"–";}
.accordion-panel{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows .24s var(--ease);
}
.accordion-panel[data-open]{grid-template-rows:1fr;}
.accordion-panel > .accordion-body{overflow:hidden;min-height:0;}
.accordion-body > *{
  padding:0 1.2rem 1.15rem;
  color:var(--mist);
  font-size:.96rem;
}

/* ---------- 11. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--r-m);
  aspect-ratio:16 / 10;
  background:linear-gradient(150deg,rgba(18,41,63,.95),rgba(9,22,36,.9));
}
.media-frame > img,
.media-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame[data-ratio="wide"]{aspect-ratio:21 / 9;}
.media-frame[data-ratio="square"]{aspect-ratio:1 / 1;}
.media-frame[data-ratio="tall"]{aspect-ratio:4 / 5;}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:
    linear-gradient(180deg,rgba(11,27,43,0) 42%,rgba(11,27,43,.68) 100%),
    linear-gradient(90deg,rgba(47,224,200,.18) 0 3px,transparent 3px);
}

/* =========================================================
   12. 页头：框架式导航
   ========================================================= */
.site-header{
  position:sticky;
  top:0;
  z-index:40;
  background:linear-gradient(180deg,rgba(11,27,43,.97) 0%,rgba(11,27,43,.9) 100%);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.site-header.is-scrolled{
  border-bottom-color:var(--line-amber);
  box-shadow:0 14px 34px rgba(3,10,20,.45);
}

.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-70px;
  z-index:90;
  padding:.6rem 1.1rem;
  border-radius:0 0 12px 12px;
  background:var(--amber);
  color:#0B1B2B;
  font-size:.9rem;
  font-weight:800;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0;}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background:rgba(124,140,168,.16);
  pointer-events:none;
}
.scroll-progress-bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--amber),var(--cyan));
  transition:width .14s linear;
}

.header-frame{
  position:relative;
  width:min(var(--page-max),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
}
.header-core{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto auto;
  align-items:center;
  column-gap:clamp(.8rem,2.2vw,2.2rem);
  padding:.85rem 0;
}

.brand-block{display:flex;flex-direction:column;gap:.15rem;min-width:0;}
.brand{display:inline-flex;align-items:center;gap:.7rem;min-width:0;}
.brand-mark{
  display:grid;
  place-items:center;
  flex:none;
  width:42px;height:42px;
  border-radius:12px;
  background:linear-gradient(140deg,var(--amber),#C98D12);
  color:#0B1B2B;
  font-family:var(--font-mono);
  font-size:.95rem;
  font-weight:700;
  letter-spacing:.04em;
  box-shadow:0 8px 20px rgba(240,180,41,.22);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25;min-width:0;}
.brand-name{
  font-size:1.08rem;
  font-weight:900;
  letter-spacing:-.01em;
  white-space:nowrap;
}
.brand-signature{
  align-self:flex-start;
  margin-top:.14rem;
  padding:.02rem .5rem;
  border:1px solid var(--line-cyan);
  border-radius:var(--r-pill);
  font-family:var(--font-mono);
  font-size:.68rem;
  font-weight:500;
  letter-spacing:.12em;
  color:var(--cyan);
}
.brand-tagline{
  font-size:.8rem;
  line-height:1.5;
  color:var(--mist);
  padding-left:calc(42px + .7rem);
}

.nav-panel{display:contents;}
.primary-nav{justify-self:center;min-width:0;}
.nav-list{display:flex;align-items:center;gap:.15rem;flex-wrap:wrap;justify-content:center;}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:.55rem .78rem;
  border-radius:var(--r-s);
  font-size:.95rem;
  font-weight:600;
  color:var(--mist);
  white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:.78rem;right:.78rem;bottom:.22rem;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .24s var(--ease),background-color .24s var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(47,224,200,.07);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link[aria-current="page"]{
  color:var(--paper);
  background:rgba(240,180,41,.12);
}
.nav-link[aria-current="page"]::after{
  transform:scaleX(1);
  background:var(--amber);
}

.header-actions{display:flex;align-items:center;gap:.55rem;}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.5rem .78rem;
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  font-size:.85rem;
  font-weight:700;
  color:var(--paper);
  transition:border-color .2s var(--ease),background-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--line-cyan);background:rgba(47,224,200,.08);}
.nav-toggle-bars{display:grid;gap:3px;width:16px;flex:none;}
.nav-toggle-bars span{
  display:block;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .24s var(--ease),opacity .18s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(5px) 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(-5px) rotate(-45deg);}
.nav-toggle-text{line-height:1;}

.header-scale{
  height:5px;
  background-image:repeating-linear-gradient(90deg,rgba(124,140,168,.32) 0 1px,transparent 1px 14px);
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
  opacity:.85;
}

@keyframes navPanelIn{
  from{opacity:0;transform:translateY(-8px);}
  to{opacity:1;transform:none;}
}

/* =========================================================
   13. 页脚：年份色带 + 归档索引
   ========================================================= */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:clamp(2.4rem,6vw,5rem);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(18,41,63,.78),rgba(9,22,36,.97));
  color:var(--mist);
  font-size:.95rem;
}

.footer-bands{
  display:flex;
  height:28px;
  border-bottom:1px solid var(--line);
}
.band{
  display:flex;
  flex:1 1 0;
  align-items:center;
  justify-content:center;
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:600;
  letter-spacing:.18em;
  color:rgba(11,27,43,.86);
  transition:filter .2s var(--ease),flex-grow .24s var(--ease);
}
.band:hover{filter:brightness(1.14) saturate(1.08);}
.band-y2023{background:var(--steel);}
.band-y2024{background:var(--teal);}
.band-y2025{background:var(--ember);}

.footer-frame{
  width:min(var(--page-max),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
  padding:clamp(1.9rem,4vw,3.2rem) 0 1.4rem;
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,2.1fr);
  gap:clamp(1.4rem,3vw,3rem);
}
.footer-brand{display:flex;flex-direction:column;gap:.8rem;}
.footer-mark{
  display:inline-grid;
  place-items:center;
  align-self:flex-start;
  width:44px;height:44px;
  border:1px solid var(--line-amber);
  border-radius:12px;
  color:var(--amber);
  font-family:var(--font-mono);
  font-weight:700;
  letter-spacing:.06em;
}
.footer-line{max-width:36ch;font-size:.95rem;line-height:1.8;}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(1rem,2.4vw,2rem);
}
.footer-column{min-width:0;}
.footer-heading{
  margin-bottom:.85rem;
  font-family:var(--font-mono);
  font-size:.74rem;
  font-weight:600;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--amber);
}
.footer-links{display:flex;flex-direction:column;gap:.42rem;}
.footer-links a{
  display:inline-block;
  font-size:.92rem;
  color:var(--mist);
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-links a:hover{color:var(--cyan);transform:translateX(3px);}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-start;
  justify-content:space-between;
  gap:1.2rem 2rem;
  margin-top:clamp(1.7rem,3.6vw,2.8rem);
  padding-top:1.2rem;
  border-top:1px solid var(--line);
}
.footer-contact{display:flex;flex-direction:column;gap:.4rem;font-size:.9rem;}
.footer-contact-line{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
}
.footer-label{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--steel);
}
.footer-note{font-size:.84rem;color:var(--steel);}

.copy-btn{
  padding:.18rem .6rem;
  border:1px solid var(--line-cyan);
  border-radius:var(--r-pill);
  font-size:.74rem;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--cyan);
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.copy-btn:hover{background:rgba(47,224,200,.14);}
.copy-btn.is-done{
  color:var(--ok);
  border-color:rgba(74,222,128,.5);
  background:rgba(74,222,128,.12);
}

.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem .9rem;
  font-size:.82rem;
  color:var(--steel);
}
.footer-icp{
  padding:.16rem .55rem;
  border:1px solid var(--line);
  border-radius:var(--r-s);
  font-family:var(--font-mono);
  letter-spacing:.08em;
  color:var(--mist);
}

/* =========================================================
   14. 响应式
   ========================================================= */
@media (max-width:1100px){
  .brand-tagline{display:none;}
  .nav-link{font-size:.9rem;padding:.5rem .6rem;}
  .nav-link::after{left:.6rem;right:.6rem;}
}

@media (max-width:920px){
  .header-core{
    grid-template-columns:minmax(0,1fr) auto;
    column-gap:.6rem;
    padding:.7rem 0;
  }
  .primary-nav{justify-self:stretch;}

  .nav-panel{
    display:none;
    position:absolute;
    left:0;right:0;
    top:calc(100% + 1px);
    z-index:6;
    max-height:calc(100vh - 6rem);
    overflow-y:auto;
    padding:1rem;
    border:1px solid var(--line);
    border-top:0;
    border-radius:0 0 var(--r-m) var(--r-m);
    background:linear-gradient(180deg,var(--hull),var(--hull-deep));
    box-shadow:var(--shadow);
  }
  .nav-panel[data-open]{display:block;animation:navPanelIn .24s var(--ease);}

  .nav-list{flex-direction:column;align-items:stretch;gap:2px;}
  .nav-link{
    padding:.75rem .8rem;
    font-size:1rem;
    border-radius:var(--r-s);
  }
  .nav-link::after{left:.8rem;right:.8rem;bottom:.34rem;}

  .header-actions{
    flex-direction:column;
    align-items:stretch;
    gap:.6rem;
    margin-top:.9rem;
    padding-top:.9rem;
    border-top:1px dashed var(--line);
  }
  .header-actions .btn{width:100%;}

  .nav-toggle{display:inline-flex;}

  .footer-top{grid-template-columns:1fr;}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:960px){
  .col-3,.col-4{grid-column:span 6;}
  .col-6,.col-8,.col-9{grid-column:span 12;}
}

@media (max-width:640px){
  body{font-size:16px;}
  .brand-mark{width:38px;height:38px;border-radius:10px;font-size:.85rem;}
  .brand-name{font-size:1rem;}
  .brand-signature{font-size:.64rem;}

  .col-3,.col-4{grid-column:span 12;}
  .footer-nav{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;}
  .band{font-size:.66rem;letter-spacing:.12em;}
}

/* =========================================================
   15. 动效降级
   ========================================================= */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  .btn:hover,.card:hover,.footer-links a:hover{transform:none;}
}