/* ============================================================
   云顶游艺 · 共享样式 /assets/site.css
   结构：变量 → 重置 → 中文排版 → 外壳（轨道+框条）→ 页脚
        → 通用组件 → 响应式 → 动效与无障碍
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink-950:#071A2F;
  --ink-800:#0D2F52;
  --ink-600:#174E7A;
  --cloud:#F8FCFF;
  --mist:#E8F3FA;
  --text:#102A43;
  --muted:#5B7188;
  --coral:#D9482B;
  --coral-soft:#FFE1D8;
  --jade:#087A5A;
  --jade-soft:#DDF6EC;
  --sand:#F3E7D3;

  --rail-w:15rem;
  --topbar-h:4.5rem;
  --gutter:clamp(1.1rem,4vw,2.6rem);

  --font-head:"HarmonyOS Sans SC","Alibaba PuHuiTi 3.0","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --r-sm:10px;
  --r-md:16px;
  --r-lg:26px;
  --line:rgba(13,47,82,.12);
  --shadow-soft:0 1px 2px rgba(7,26,47,.04),0 14px 30px -18px rgba(7,26,47,.35);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
img,svg,picture,video{display:block;max-width:100%;}
table{border-collapse:collapse;width:100%;}
hr{border:0;border-top:1px solid var(--line);}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:clamp(1rem,.32vw + .93rem,1.125rem);
  line-height:1.75;
  color:var(--text);
  background:var(--cloud);
  padding-left:var(--rail-w);
  padding-top:var(--topbar-h);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5{
  font-family:var(--font-head);
  font-weight:800;
  color:var(--ink-950);
  line-height:1.15;
  letter-spacing:-.02em;
}
h1{font-size:clamp(2.4rem,6vw,5rem);line-height:1.05;letter-spacing:-.03em;}
h2{font-size:clamp(1.7rem,3.4vw,2.7rem);}
h3{font-size:clamp(1.22rem,2vw,1.6rem);letter-spacing:-.01em;}
h4{font-size:1.06rem;font-weight:700;letter-spacing:0;}
p{text-wrap:pretty;}
strong{font-weight:700;color:var(--ink-950);}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em;}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;}

/* ---------- 4. 无障碍焦点与跳转 ---------- */
:focus-visible{outline:3px solid var(--coral);outline-offset:2px;border-radius:6px;}
.site-footer :focus-visible,.rail :focus-visible{outline-color:#FFB9A5;}
.skip-link{
  position:fixed;top:.6rem;left:.6rem;z-index:300;
  padding:.7rem 1.1rem;border-radius:10px;
  background:var(--ink-950);color:#fff;
  font-size:.9rem;font-weight:600;
  transform:translateY(-160%);
  transition:transform .24s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);}

/* ---------- 5. 外壳：框架式页头 ---------- */
.site-header{
  position:fixed;
  inset:0;
  z-index:100;
  pointer-events:none;
  display:grid;
  grid-template-columns:var(--rail-w) minmax(0,1fr);
  grid-template-rows:var(--topbar-h) minmax(0,1fr);
  grid-template-areas:"rail topbar" "rail blank";
  font-family:var(--font-body);
}

/* 5.1 左侧品牌轨道 */
.rail{
  grid-area:rail;
  pointer-events:auto;
  position:relative;
  display:flex;
  flex-direction:column;
  gap:1rem;
  padding:1.55rem 1.2rem 1.2rem;
  background:linear-gradient(178deg,#164B79 0%,#0D2F52 46%,#071A2F 100%);
  color:var(--cloud);
  overflow:hidden;
}
.rail__brand{
  display:flex;
  flex-direction:column;
  gap:.5rem;
  padding-bottom:1rem;
  border-bottom:1px solid rgba(232,243,250,.18);
}
.rail__mark{display:flex;align-items:flex-end;gap:5px;height:1.35rem;}
.rail__mark span{display:block;width:7px;border-radius:99px;}
.rail__mark span:nth-child(1){height:40%;background:#8FD9C2;}
.rail__mark span:nth-child(2){height:70%;background:#F08A70;}
.rail__mark span:nth-child(3){height:100%;background:var(--cloud);}
.rail__name{font-family:var(--font-head);font-size:1.5rem;font-weight:800;letter-spacing:.08em;line-height:1.1;color:#fff;}
.rail__tag{font-size:.72rem;letter-spacing:.26em;color:#9DC0DC;}
.rail__meta{font-size:.72rem;letter-spacing:.08em;color:#9DC0DC;}
.rail__quick-label{font-size:.66rem;letter-spacing:.22em;color:#7FA6C4;}
.rail__quick{display:flex;flex-direction:column;gap:.45rem;}
.pill{
  display:flex;align-items:center;gap:.5rem;
  padding:.55rem .8rem;border-radius:999px;
  border:1px solid rgba(232,243,250,.2);
  background:rgba(232,243,250,.05);
  font-size:.85rem;color:#DCEBF7;
  transition:transform .22s var(--ease),background-color .22s,border-color .22s;
}
.pill::before{content:"";width:.35rem;height:.35rem;border-radius:50%;background:#7FA6C4;flex:none;transition:background-color .22s;}
.pill:hover{background:rgba(232,243,250,.14);border-color:rgba(232,243,250,.44);transform:translateX(3px);}
.pill:hover::before{background:#F08A70;}
.pill--mint{background:rgba(8,122,90,.24);border-color:rgba(8,122,90,.58);color:#CDF3E6;}
.pill--mint::before{background:#8FD9C2;}
.rail__note{
  margin-top:auto;
  padding-top:.9rem;
  border-top:1px dashed rgba(232,243,250,.22);
  font-size:.76rem;
  line-height:1.65;
  color:#B9D3E6;
}
.rail__note .mono{display:block;margin-bottom:.25rem;font-size:.64rem;letter-spacing:.2em;color:#7FA6C4;}
.rail__wave{
  flex:none;
  height:74px;
  border-radius:var(--r-md);
  opacity:.85;
  background:
    repeating-radial-gradient(circle at 50% 118%,rgba(232,243,250,.22) 0 1px,transparent 1px 13px),
    linear-gradient(180deg,rgba(232,243,250,.10),rgba(232,243,250,0));
}

/* 5.2 顶部框条 */
.topbar{
  grid-area:topbar;
  pointer-events:auto;
  position:relative;
  display:flex;
  align-items:center;
  gap:1rem;
  padding:0 clamp(1rem,2.2vw,1.8rem);
  background:rgba(248,252,255,.92);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;min-width:0;}
.nav__list{display:flex;align-items:center;gap:.15rem;}
.nav__list a{
  position:relative;display:inline-block;
  padding:.55rem .72rem;border-radius:10px;
  font-size:.94rem;font-weight:500;letter-spacing:.02em;
  color:var(--ink-800);
  transition:color .2s,background-color .2s;
}
.nav__list a::after{
  content:"";position:absolute;left:.72rem;right:.72rem;bottom:.22rem;
  height:2px;border-radius:2px;background:var(--coral);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .26s var(--ease);
}
.nav__list a:hover{color:var(--coral);background:var(--coral-soft);}
.nav__list a:hover::after,
.nav__list a[aria-current="page"]::after{transform:scaleX(1);}
.nav__list a[aria-current="page"]{color:var(--ink-950);font-weight:700;}
.topbar__actions{display:flex;align-items:center;gap:.5rem;margin-left:auto;}
.tag-link{
  display:inline-flex;align-items:center;gap:.42rem;
  padding:.42rem .8rem;border-radius:999px;
  background:var(--jade-soft);color:#06614A;
  border:1px solid rgba(8,122,90,.26);
  font-size:.82rem;font-weight:600;
  transition:background-color .2s,border-color .2s,transform .2s;
}
.tag-link::before{content:"";width:.42rem;height:.42rem;border-radius:50%;background:var(--jade);}
.tag-link:hover{background:#CFF0E3;border-color:rgba(8,122,90,.5);transform:translateY(-2px);}
.nav-toggle{
  display:none;
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
  width:2.7rem;height:2.7rem;border-radius:12px;
  border:1px solid var(--line);background:#fff;
  transition:background-color .2s,border-color .2s;
}
.nav-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:var(--ink-800);transition:transform .26s var(--ease),opacity .18s;}
.topbar__progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden;}
.topbar__progress-bar{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--jade),var(--coral));transition:width .12s linear;}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3.5rem,8vw,6rem);
  padding:clamp(4.5rem,9vw,7rem) 0 clamp(1.6rem,3vw,2.4rem);
  background:linear-gradient(180deg,#0D2F52 0%,#0A2439 55%,#071A2F 100%);
  color:#CFE2F0;
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;top:-1px;left:0;right:0;height:56px;
  background-image:radial-gradient(circle at 50% 0,var(--cloud) 0 38px,transparent 39px);
  background-size:76px 56px;
  background-repeat:repeat-x;
  pointer-events:none;
}
.site-footer::after{
  content:"";position:absolute;right:-6%;bottom:-24%;
  width:min(520px,58vw);aspect-ratio:1;border-radius:50%;
  background:repeating-radial-gradient(circle at 50% 50%,rgba(232,243,250,.10) 0 1px,transparent 1px 18px);
  pointer-events:none;
}
.footer__inner{
  position:relative;z-index:1;
  width:min(1180px,calc(100% - var(--gutter) * 2));
  margin-inline:auto;
}
.footer__grid{
  display:grid;
  grid-template-columns:minmax(0,1.25fr) minmax(0,.85fr) minmax(0,1.15fr);
  gap:clamp(2rem,5vw,4rem);
}
.footer__brand{min-width:0;}
.footer__logo{font-family:var(--font-head);font-size:1.6rem;font-weight:800;letter-spacing:.08em;color:#fff;transition:color .2s;}
.footer__logo:hover{color:var(--coral-soft);}
.footer__tag{margin-top:.5rem;font-size:.7rem;letter-spacing:.2em;color:#8FB3CE;}
.footer__summary{margin-top:1rem;max-width:34ch;font-size:.92rem;line-height:1.85;color:#B7CFE2;}
.footer__note{margin-top:.9rem;font-size:.76rem;line-height:1.7;color:#8FB3CE;}
.footer__nav,.footer__contact{min-width:0;}
.footer__title{
  margin-bottom:1rem;
  font-family:var(--font-head);
  font-size:.8rem;font-weight:700;letter-spacing:.18em;
  color:#8FB3CE;
}
.footer__links{display:grid;grid-template-columns:1fr 1fr;gap:.5rem 1.1rem;}
.footer__links a{display:inline-block;font-size:.9rem;color:#CFE2F0;transition:color .2s,transform .2s;}
.footer__links a:hover{color:#fff;transform:translateX(2px);}
.contact-list{display:flex;flex-direction:column;gap:.85rem;}
.contact-list__item{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;}
.contact-list__label{flex:none;min-width:4.6rem;font-size:.66rem;letter-spacing:.18em;color:#8FB3CE;}
.contact-list__value{font-size:.9rem;color:#E4F1FA;word-break:break-word;}
.copy-btn{
  margin-left:auto;
  padding:.24rem .62rem;border-radius:999px;
  border:1px solid rgba(232,243,250,.3);
  font-size:.72rem;color:#CFE2F0;
  transition:background-color .2s,border-color .2s,color .2s;
}
.copy-btn:hover{background:rgba(232,243,250,.14);border-color:rgba(232,243,250,.6);color:#fff;}
.copy-btn[data-copied="true"]{background:var(--jade);border-color:var(--jade);color:#fff;}
.footer__bottom{
  margin-top:clamp(2rem,4vw,3rem);
  padding-top:1.2rem;
  border-top:1px solid rgba(232,243,250,.14);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.8rem 1.5rem;
}
.footer__legal{font-size:.78rem;letter-spacing:.02em;color:#8FB3CE;}
.footer__legal .mono{color:#B7CFE2;}
.to-top{
  position:fixed;right:clamp(.8rem,2vw,1.6rem);bottom:clamp(.8rem,2vw,1.6rem);
  z-index:120;
  padding:.6rem 1rem;border-radius:999px;
  background:var(--ink-950);color:#fff;
  font-size:.8rem;font-weight:600;
  border:1px solid rgba(232,243,250,.28);
  box-shadow:0 12px 26px -16px rgba(7,26,47,.9);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s,background-color .2s;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none;}
.to-top:hover{background:var(--coral);}

/* ---------- 7. 通用容器与节奏 ---------- */
.container{width:min(1180px,calc(100% - var(--gutter) * 2));margin-inline:auto;}
.container--narrow{width:min(760px,calc(100% - var(--gutter) * 2));margin-inline:auto;}
.section{padding-block:clamp(2.8rem,6vw,5rem);}
.section--mist{background:var(--mist);}
.eyebrow{
  display:inline-flex;align-items:center;gap:.55rem;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.2em;
  color:var(--ink-600);
}
.eyebrow::before{content:"";width:1.9rem;height:2px;border-radius:2px;background:var(--coral);}

/* 7.1 面包屑 */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.02em;
  color:var(--muted);
}
.breadcrumb a{color:var(--ink-600);transition:color .2s;}
.breadcrumb a:hover{color:var(--coral);}
.breadcrumb__sep{color:rgba(13,47,82,.35);}
.breadcrumb [aria-current="page"]{color:var(--ink-950);}

/* 7.2 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.45rem;
  padding:.72rem 1.2rem;border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-body);font-size:.92rem;font-weight:600;line-height:1.2;
  cursor:pointer;
  transition:transform .2s var(--ease),background-color .2s,box-shadow .2s,color .2s,border-color .2s;
}
.btn--coral{background:var(--coral);color:#fff;box-shadow:0 10px 20px -14px rgba(217,72,43,.9);}
.btn--coral:hover{background:#C13D22;transform:translateY(-2px);}
.btn--jade{background:var(--jade);color:#fff;}
.btn--jade:hover{background:#06674C;transform:translateY(-2px);}
.btn--ghost{background:#fff;border-color:var(--line);color:var(--ink-800);}
.btn--ghost:hover{border-color:rgba(217,72,43,.5);color:var(--coral);transform:translateY(-2px);}
.btn--sm{padding:.5rem .88rem;font-size:.84rem;}
.btn--block{width:100%;}

/* 7.3 卡片 */
.card{
  position:relative;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:clamp(1.1rem,2.2vw,1.7rem);
  box-shadow:var(--shadow-soft);
  transition:transform .24s var(--ease),border-color .24s,box-shadow .24s;
}
.card:hover{transform:translateY(-3px);border-color:rgba(13,47,82,.24);}
.card__title{font-family:var(--font-head);font-size:1.15rem;font-weight:700;color:var(--ink-950);margin-bottom:.4rem;}
.card__body{font-size:.95rem;color:#33506B;}
.card__foot{margin-top:1rem;display:flex;align-items:center;gap:.6rem;flex-wrap:wrap;}
.card--mint{background:var(--jade-soft);border-color:rgba(8,122,90,.2);}
.card--coral{background:var(--coral-soft);border-color:rgba(217,72,43,.22);}
.card--sand{background:var(--sand);border-color:rgba(16,42,67,.14);}
.card--offset{transform:translateY(14px);}
.card--offset:hover{transform:translateY(11px);}

/* 7.4 标签 */
.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.28rem .66rem;border-radius:999px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;
  background:var(--mist);color:var(--ink-600);
  border:1px solid rgba(13,47,82,.1);
}
.tag--coral{background:var(--coral-soft);color:#A6341C;border-color:rgba(217,72,43,.24);}
.tag--jade{background:var(--jade-soft);color:#06614A;border-color:rgba(8,122,90,.24);}

/* 7.5 图片容器（页面阶段放图占位） */
.media{
  position:relative;
  overflow:hidden;
  border-radius:var(--r-lg);
  border:1px solid var(--line);
  aspect-ratio:16/10;
  background:linear-gradient(160deg,var(--mist) 0%,#DCEEF9 55%,var(--sand) 100%);
}
.media > img,.media > picture > img{width:100%;height:100%;object-fit:cover;}
.media--tall{aspect-ratio:4/5;}
.media--wide{aspect-ratio:21/9;}
.media--square{aspect-ratio:1;}
.media__caption{
  position:absolute;left:.9rem;bottom:.9rem;
  padding:.3rem .7rem;border-radius:999px;
  background:rgba(7,26,47,.72);color:#fff;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.04em;
}

/* 7.6 网格 */
.grid{display:grid;gap:clamp(1rem,2.4vw,1.8rem);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--split{grid-template-columns:minmax(0,7fr) minmax(0,5fr);align-items:start;}
.grid--split-rev{grid-template-columns:minmax(0,5fr) minmax(0,7fr);align-items:start;}

/* 7.7 长文 */
.prose{max-width:68ch;}
.prose > * + *{margin-top:1.05em;}
.prose h2{margin-top:2.2em;font-size:clamp(1.5rem,2.6vw,2rem);}
.prose h3{margin-top:1.6em;}
.prose ul,.prose ol{padding-left:1.25em;list-style:disc;}
.prose ol{list-style:decimal;}
.prose li + li{margin-top:.35em;}
.prose a{color:var(--coral);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;}
.prose blockquote{border-left:3px solid var(--coral);padding:.2em 0 .2em 1em;color:var(--ink-600);}
.prose code{font-family:var(--font-mono);font-size:.9em;background:var(--mist);padding:.1em .4em;border-radius:6px;}

/* 7.8 折叠内容组 */
.accordion{display:flex;flex-direction:column;gap:.7rem;}
.accordion__item{
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:#fff;
  overflow:hidden;
  transition:border-color .22s,box-shadow .22s;
}
.accordion__item[data-open="true"]{border-color:rgba(217,72,43,.45);box-shadow:var(--shadow-soft);}
.accordion__trigger{
  display:flex;width:100%;align-items:center;gap:1rem;
  padding:1rem 1.15rem;text-align:left;
  font-family:var(--font-body);font-size:1rem;font-weight:600;color:var(--ink-950);
}
.accordion__trigger::after{
  content:"";margin-left:auto;flex:none;
  width:.6rem;height:.6rem;
  border-right:2px solid var(--coral);border-bottom:2px solid var(--coral);
  transform:rotate(45deg);
  transition:transform .24s var(--ease);
}
.accordion__item[data-open="true"] .accordion__trigger::after{transform:rotate(-135deg);}
.accordion__panel{height:0;overflow:hidden;transition:height .28s var(--ease);}
.accordion__panel-inner{padding:0 1.15rem 1.15rem;color:#2B4661;font-size:.95rem;}

/* ---------- 8. 响应式 ---------- */
@media (max-width:1180px){
  .nav__list a{padding:.5rem .55rem;font-size:.9rem;}
}

@media (max-width:1023px){
  body{padding-left:0;padding-top:0;}
  .site-header{
    position:sticky;inset:auto;top:0;
    pointer-events:auto;
    grid-template-columns:minmax(0,1fr);
    grid-template-rows:auto auto;
    grid-template-areas:"rail" "topbar";
    background:var(--cloud);
    box-shadow:0 10px 26px -24px rgba(7,26,47,.85);
  }
  .rail{
    flex-direction:row;align-items:center;gap:.75rem;
    padding:.62rem clamp(.9rem,4vw,1.6rem);
    background:linear-gradient(90deg,#164B79 0%,#0A2439 72%,#123F68 100%);
  }
  .rail__brand{flex-direction:row;align-items:center;gap:.55rem;padding-bottom:0;border-bottom:0;}
  .rail__mark{height:1.1rem;}
  .rail__name{font-size:1.15rem;}
  .rail__tag{font-size:.64rem;letter-spacing:.18em;}
  .rail__meta,.rail__quick-label,.rail__quick,.rail__note,.rail__wave{display:none;}

  .topbar{
    padding:.5rem clamp(.9rem,4vw,1.6rem);
    background:var(--cloud);
    border-bottom:1px solid var(--line);
  }
  .nav{
    position:absolute;top:100%;left:0;right:0;
    flex-direction:column;align-items:stretch;
    padding:.7rem .8rem 1rem;
    background:var(--cloud);
    border-bottom:1px solid var(--line);
    box-shadow:0 22px 34px -26px rgba(7,26,47,.95);
    max-height:calc(100vh - 7rem);
    overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s;
  }
  .site-header[data-open="true"] .nav{opacity:1;visibility:visible;transform:translateY(0);}
  .nav__list{flex-direction:column;align-items:stretch;gap:.2rem;}
  .nav__list a{display:block;padding:.8rem .9rem;border-radius:12px;font-size:1rem;}
  .nav__list a::after{display:none;}
  .nav__list a:hover{background:var(--coral-soft);color:var(--coral);}
  .nav__list a[aria-current="page"]{background:var(--coral-soft);color:var(--coral);}
  .tag-link{display:none;}
  .nav-toggle{display:inline-flex;}
  .site-header[data-open="true"] .nav-toggle{background:var(--coral-soft);border-color:rgba(217,72,43,.35);}
  .site-header[data-open="true"] .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg);}
  .site-header[data-open="true"] .nav-toggle span:nth-child(2){opacity:0;}
  .site-header[data-open="true"] .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer__contact{grid-column:1 / -1;}
}

@media (max-width:900px){
  .grid--2,.grid--3,.grid--split,.grid--split-rev{grid-template-columns:minmax(0,1fr);}
  .card--offset{transform:none;}
  .card--offset:hover{transform:translateY(-3px);}
}

@media (max-width:640px){
  .footer__grid{grid-template-columns:minmax(0,1fr);}
  .footer__links{grid-template-columns:1fr 1fr;}
  .to-top{padding:.5rem .85rem;font-size:.74rem;}
}

@media (max-height:720px) and (min-width:1024px){
  .rail__note{display:none;}
  .rail__wave{height:46px;}
}

/* ---------- 9. 动效与无障碍降级 ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}
.js [data-reveal].is-visible{opacity:1;transform:none;}

@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;
  }
  .js [data-reveal]{opacity:1;transform:none;}
  .pill:hover,.card:hover,.btn:hover,.tag-link:hover,.to-top:hover{transform:none;}
}