/* =========================================================
   微赢棋牌电玩 · 共享样式 /site.css
   深靛蓝底 + 霓虹青 / 品红 / 琥珀金，粗野主义硬边框体系
   ========================================================= */

:root{
  --bg:#0B1026;
  --bg-deep:#05070F;
  --mid:#1B2350;
  --line:#2A3566;
  --cyan:#35E6D2;
  --magenta:#FF3D8B;
  --amber:#FFC24B;
  --ink:#E6ECF5;
  --muted:#8A93AE;
  --info:#7CD4FF;

  --wrap:1200px;
  --gutter:clamp(16px,4vw,40px);
  --ease:cubic-bezier(.2,.7,.3,1);
  --shadow-card:8px 8px 0 rgba(5,7,15,.9);
  --shadow-card-hover:12px 14px 0 rgba(5,7,15,.95);

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
}

/* ---------- reset ---------- */
*,*::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,fieldset{margin:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit}
table{border-collapse:collapse}

/* ---------- base ---------- */
body{
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.8;
  letter-spacing:.01em;
  color:var(--ink);
  background-color:var(--bg);
  background-image:
    linear-gradient(rgba(42,53,102,.30) 1px,transparent 1px),
    linear-gradient(90deg,rgba(42,53,102,.30) 1px,transparent 1px);
  background-size:72px 72px;
  background-attachment:fixed;
  overflow-x:hidden;
}

h1,h2,h3,h4{font-weight:900;line-height:1.12;letter-spacing:-.01em}
h1{font-size:clamp(34px,5.6vw,56px);line-height:1.05}
h2{font-size:clamp(26px,3.6vw,40px);line-height:1.1}
h3{font-size:clamp(20px,2.4vw,28px);line-height:1.18}
h4{font-size:20px}
strong,b{font-weight:700;color:#fff}

:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}
::selection{background:var(--cyan);color:var(--bg-deep)}

/* ---------- 布局容器 ---------- */
.wrap{
  width:min(100% - (var(--gutter) * 2), var(--wrap));
  margin-inline:auto;
}
.wrap--narrow{--wrap:860px}

.section{padding:clamp(40px,6.5vw,88px) 0}
.section--tight{padding:clamp(24px,4vw,48px) 0}
.section--panel{background:var(--bg-deep);border-top:2px solid var(--line);border-bottom:2px solid var(--line)}

.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--offset > *:nth-child(even){transform:translateY(clamp(14px,3vw,34px))}

/* ---------- 文字工具 ---------- */
.mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.08em}
.text-muted{color:var(--muted)}
.text-cyan{color:var(--cyan)}
.text-amber{color:var(--amber)}
.text-magenta{color:var(--magenta)}

.display-1{font-size:clamp(42px,8vw,88px);font-weight:900;line-height:1.02;letter-spacing:-.03em}
.display-2{font-size:clamp(32px,5.2vw,60px);font-weight:900;line-height:1.04;letter-spacing:-.02em}
.h-3{font-size:clamp(22px,2.8vw,30px);font-weight:900;line-height:1.15}
.h-4{font-size:20px;font-weight:900;line-height:1.25}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.18em;
  color:var(--cyan);text-transform:uppercase;
}
.eyebrow::before{content:"";width:28px;height:2px;background:currentColor;flex:none}

.lede{font-size:clamp(17px,1.8vw,20px);line-height:1.75;color:#c3cade;max-width:54ch}

.prose{max-width:62ch;font-size:17px;line-height:1.85;color:#cfd6e6}
.prose p{margin-bottom:1.1em}
.prose p:last-child{margin-bottom:0}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.4em;list-style:square}
.prose li{margin-bottom:.35em}
.prose a{color:var(--cyan);text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}
.prose h3{margin:1.4em 0 .5em}
.prose h4{margin:1.2em 0 .4em}

.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:16px;padding-bottom:16px;margin-bottom:clamp(20px,3vw,36px);
  border-bottom:2px solid var(--line);
}
.section-head__title{font-size:clamp(24px,3.2vw,36px);font-weight:900;line-height:1.1}
.section-head__aside{font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;color:var(--muted)}

.divider{height:2px;background:var(--line);border:0;margin:clamp(24px,4vw,48px) 0}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 20px;
  border:2px solid var(--line);
  background:var(--mid);
  color:var(--ink);
  font-size:15px;font-weight:700;letter-spacing:.02em;
  text-decoration:none;cursor:pointer;
  box-shadow:6px 6px 0 rgba(5,7,15,.95);
  transition:transform .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{transform:translate(-2px,-2px);border-color:var(--cyan);box-shadow:8px 8px 0 rgba(5,7,15,.95)}
.btn:active{transform:translate(0,0);box-shadow:3px 3px 0 rgba(5,7,15,.95)}
.btn--primary{background:var(--cyan);border-color:var(--cyan);color:var(--bg-deep)}
.btn--primary:hover{border-color:var(--ink)}
.btn--amber{background:var(--amber);border-color:var(--amber);color:var(--bg-deep)}
.btn--ghost{background:transparent;color:var(--ink)}
.btn--ghost:hover{background:var(--mid);color:var(--cyan)}
.btn__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;opacity:.75}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);
}
.breadcrumb a{color:var(--muted);text-decoration:none;border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease)}
.breadcrumb a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.breadcrumb__sep{color:var(--line)}
.breadcrumb [aria-current="page"]{color:var(--ink)}

/* ---------- 页面头 ---------- */
.page-head{padding:clamp(32px,5vw,72px) 0 clamp(22px,3.6vw,44px);border-bottom:2px solid var(--line)}
.page-head__top{margin-bottom:clamp(18px,3vw,30px)}
.page-head__body{display:grid;gap:clamp(14px,2.4vw,28px)}
.page-head__meta{display:flex;flex-wrap:wrap;gap:10px}

/* ---------- 卡片 ---------- */
.card{
  position:relative;display:block;
  padding:clamp(18px,2.4vw,28px);
  background:var(--mid);
  border:2px solid var(--line);
  box-shadow:var(--shadow-card);
  color:inherit;text-decoration:none;
  transition:transform .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease),box-shadow .18s var(--ease);
}
.card:hover,.card:focus-visible{transform:translateY(-4px);border-color:var(--cyan);background:#212a5c;box-shadow:var(--shadow-card-hover)}
.card__num{display:block;font-family:var(--font-mono);font-size:13px;letter-spacing:.14em;color:var(--cyan);margin-bottom:10px}
.card__title{font-size:clamp(18px,2vw,21px);font-weight:900;line-height:1.24;margin-bottom:8px}
.card__text{font-size:15px;line-height:1.75;color:#c3cade}
.card__foot{margin-top:16px;display:flex;flex-wrap:wrap;gap:8px;align-items:center}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid var(--line);
  background:rgba(27,35,80,.65);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);
}
.tag--cyan{background:var(--cyan);border-color:var(--cyan);color:var(--bg-deep)}
.tag--magenta{color:var(--magenta);border-color:var(--magenta)}
.tag--amber{color:var(--amber);border-color:var(--amber)}
.tag--info{color:var(--info);border-color:var(--info)}

/* ---------- 编号索引行 ---------- */
.index-list{border-top:2px solid var(--line)}
.index-list__item{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;
  gap:clamp(12px,2vw,24px);align-items:baseline;
  padding:16px 12px;border-bottom:1px solid var(--line);
  color:inherit;text-decoration:none;
  transition:background-color .18s var(--ease),padding-left .18s var(--ease);
}
.index-list__item:hover{background:var(--mid);padding-left:22px}
.index-list__num{font-family:var(--font-mono);font-size:13px;letter-spacing:.12em;color:var(--muted);transition:color .18s var(--ease)}
.index-list__item:hover .index-list__num{color:var(--cyan)}
.index-list__title{font-size:16px;font-weight:700;line-height:1.5}
.index-list__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted);white-space:nowrap}

/* ---------- 编号步骤 ---------- */
.steps{counter-reset:step;display:grid;gap:14px}
.steps > li{position:relative;padding-left:60px;min-height:34px;line-height:1.7}
.steps > li::before{
  counter-increment:step;content:counter(step,decimal-leading-zero);
  position:absolute;left:0;top:0;
  padding:3px 8px;border:2px solid var(--line);background:var(--bg-deep);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--cyan);
}

/* ---------- 折叠问答 ---------- */
.fold{border:2px solid var(--line);background:var(--bg-deep);margin-bottom:12px}
.fold summary{
  display:flex;align-items:center;gap:12px;
  padding:16px 18px;font-weight:700;line-height:1.5;cursor:pointer;list-style:none;
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.fold summary::-webkit-details-marker{display:none}
.fold summary::after{content:"+";margin-left:auto;font-family:var(--font-mono);font-size:16px;color:var(--cyan)}
.fold summary:hover{background:var(--mid);color:var(--cyan)}
.fold[open] summary{border-bottom:2px solid var(--line);color:var(--cyan)}
.fold[open] summary::after{content:"–"}
.fold__body{padding:16px 18px;font-size:15px;line-height:1.85;color:#c3cade}
.fold__body p{margin-bottom:.8em}
.fold__body p:last-child{margin-bottom:0}

/* ---------- 数值刻度 ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px}
.stat{padding:16px 18px;border:2px solid var(--line);background:var(--bg-deep)}
.stat__num{display:block;font-family:var(--font-mono);font-size:clamp(22px,3vw,30px);font-weight:700;color:var(--amber);line-height:1.2}
.stat__label{display:block;margin-top:6px;font-size:13px;color:var(--muted)}

/* ---------- 图片容器（页面阶段复用） ---------- */
.media{
  position:relative;display:block;width:100%;overflow:hidden;
  background:linear-gradient(135deg,#1B2350 0%,#05070F 72%);
  border:2px solid var(--line);
}
.media::before{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(53,230,210,.09) 1px,transparent 1px),
    linear-gradient(90deg,rgba(53,230,210,.09) 1px,transparent 1px);
  background-size:26px 26px;
}
.media::after{
  content:"";position:absolute;right:-46px;bottom:-46px;width:150px;height:150px;
  border:2px solid var(--line);border-radius:50%;
  background:radial-gradient(circle at 32% 32%,rgba(255,61,139,.34),transparent 62%);
}
.media > img,.media > video{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16/9}
.media--3x2{aspect-ratio:3/2}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media__placeholder{
  position:absolute;inset:0;z-index:1;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--muted);
}
.media__cap{
  position:absolute;left:0;bottom:0;z-index:2;
  padding:6px 12px;background:var(--bg-deep);
  border-top:2px solid var(--line);border-right:2px solid var(--line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);
}

/* ---------- 滚动显现（JS 协议） ---------- */
html.js [data-reveal]{opacity:0;transform:translateX(-12px);transition:opacity .18s var(--ease),transform .18s var(--ease)}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* =========================================================
   头部
   ========================================================= */
.site-header{
  position:sticky;top:0;z-index:90;
  background:var(--bg-deep);
}
.skip-link{
  position:absolute;left:12px;top:-72px;z-index:120;
  padding:10px 16px;background:var(--cyan);color:var(--bg-deep);
  font-size:14px;font-weight:700;text-decoration:none;border:2px solid var(--bg-deep);
  transition:top .15s var(--ease);
}
.skip-link:focus{top:10px}

.scroll-progress{position:absolute;left:0;right:0;bottom:-2px;height:3px;background:rgba(42,53,102,.7);z-index:3}
.scroll-progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cyan),var(--magenta),var(--amber))}

/* 上层细条 */
.header-rail{
  background:linear-gradient(90deg,#05070F 0%,#0B1026 58%,#1B2350 100%);
  border-bottom:1px solid var(--line);
}
.header-rail__inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:12px;min-height:36px;font-size:13px;
}
.header-rail__brand{display:flex;align-items:center;gap:8px;color:var(--muted);line-height:1.4}
.header-rail__mark{width:8px;height:8px;background:var(--cyan);box-shadow:0 0 0 3px rgba(53,230,210,.18);flex:none}
.header-rail__name{color:var(--ink);font-weight:700}
.header-rail__sep{color:var(--line)}
.header-rail__sub{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--muted)}
.header-rail__quick{display:flex;align-items:center;gap:6px}
.rail-link{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border:1px solid transparent;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--muted);text-decoration:none;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.rail-link:hover{color:var(--ink);border-color:var(--line);background:rgba(27,35,80,.85)}
.rail-link--accent{color:var(--cyan)}
.rail-link--accent:hover{border-color:var(--cyan);color:var(--cyan)}

/* 主栏 */
.header-main{position:relative;background:var(--bg);border-bottom:2px solid var(--line);transition:box-shadow .18s var(--ease)}
.site-header[data-collapsed] .header-main{box-shadow:0 8px 0 rgba(5,7,15,.85)}
.header-main__inner{display:flex;align-items:center;gap:clamp(10px,1.6vw,22px);min-height:70px}

.brand{display:inline-flex;align-items:center;gap:12px;flex:none;text-decoration:none}
.brand__badge{
  display:grid;place-items:center;width:42px;height:42px;flex:none;
  background:var(--cyan);color:var(--bg-deep);
  font-size:20px;font-weight:900;
  box-shadow:4px 4px 0 var(--magenta);
  clip-path:polygon(0 0,100% 0,100% 72%,74% 100%,0 100%);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__title{font-size:18px;font-weight:900;letter-spacing:.02em;color:var(--ink)}
.brand__meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--muted)}

.site-nav{margin-left:auto}
.site-nav__list{display:flex;flex-wrap:nowrap;align-items:stretch;gap:2px}
.site-nav__link{
  display:inline-flex;align-items:baseline;gap:8px;
  padding:14px clamp(6px,.85vw,14px);
  color:var(--ink);text-decoration:none;font-size:clamp(13px,1.06vw,15px);font-weight:500;
  border-bottom:3px solid transparent;white-space:nowrap;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.site-nav__label{white-space:nowrap}
.site-nav__num{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--muted);transition:color .18s var(--ease)}
.site-nav__link:hover{background:var(--mid);border-bottom-color:var(--line)}
.site-nav__link:hover .site-nav__num{color:var(--info)}
.site-nav__link[aria-current="page"]{color:var(--cyan);border-bottom-color:var(--cyan);background:rgba(53,230,210,.09)}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--cyan)}

.header-actions{display:flex;align-items:center;gap:10px;flex:none}
.header-cta{
  display:none;align-items:center;
  padding:8px 14px;border:2px solid var(--cyan);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  color:var(--cyan);text-decoration:none;
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.header-cta:hover{background:var(--cyan);color:var(--bg-deep)}
.site-header[data-collapsed] .header-cta{display:inline-flex}
.site-header[data-collapsed] .header-rail{display:none}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 14px;border:2px solid var(--line);background:var(--mid);color:var(--ink);
  font-weight:700;
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan);background:rgba(53,230,210,.14);color:var(--cyan)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:20px;flex:none}
.nav-toggle__bars > span{display:block;height:2px;background:var(--cyan)}
.nav-toggle__label{font-family:var(--font-mono);font-size:12px;letter-spacing:.12em}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,110px);
  background:var(--bg-deep);
  border-top:3px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;top:-3px;left:0;height:3px;width:min(360px,42%);
  background:linear-gradient(90deg,var(--cyan),var(--magenta),var(--amber));
}
.site-footer__inner{padding:clamp(34px,5vw,60px) 0 22px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1.1fr 1.6fr 1.1fr;gap:clamp(22px,3vw,42px)}

.footer-col{min-width:0}
.footer-brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;margin-bottom:14px}
.footer-brand__badge{
  display:grid;place-items:center;width:30px;height:30px;flex:none;
  background:var(--cyan);color:var(--bg-deep);font-weight:900;font-size:15px;
  clip-path:polygon(0 0,100% 0,100% 72%,74% 100%,0 100%);
}
.footer-brand__name{font-size:17px;font-weight:900;color:var(--ink)}
.footer-tagline{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;
  color:var(--cyan);line-height:1.9;
}
.footer-note{margin-top:12px;font-size:13px;line-height:1.75;color:var(--muted);max-width:34ch}

.footer-title{
  display:flex;align-items:center;gap:8px;
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:12px;font-weight:700;
  letter-spacing:.18em;color:var(--muted);
}
.footer-title::before{content:"";width:14px;height:2px;background:var(--cyan);flex:none}

.footer-nav{display:flex;flex-direction:column;gap:8px}
.footer-nav--tight{margin-top:16px}
.footer-nav a{
  display:inline-block;font-size:14px;color:#c3cade;text-decoration:none;
  border-bottom:1px solid transparent;padding-bottom:2px;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-nav a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

.footer-contact{display:flex;flex-direction:column;gap:10px;font-size:14px;color:#c3cade}
.footer-contact > li{display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px;align-items:baseline}
.footer-contact__label{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);
  border-left:2px solid var(--line);padding-left:8px;
}
.footer-contact .mono{color:var(--ink);font-size:13px;word-break:break-all}

.footer-cta{width:100%;justify-content:center}

.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px;
  margin-top:clamp(26px,4vw,44px);padding-top:16px;
  border-top:1px solid var(--line);
  font-size:13px;color:var(--muted);
}
.footer-copy{margin:0}
.icp{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted)}

/* 回到顶部 */
.to-top{
  position:fixed;right:clamp(12px,3vw,28px);bottom:clamp(12px,3vw,28px);z-index:80;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;
  background:var(--bg-deep);border:2px solid var(--line);color:var(--ink);
  box-shadow:6px 6px 0 rgba(5,7,15,.95);
  transition:border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.to-top[hidden]{display:none}
.to-top:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-3px)}
.to-top__mark{font-size:11px;color:var(--cyan);letter-spacing:.14em}
.to-top__text{font-size:13px;font-weight:700}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1180px){
  .footer-grid{grid-template-columns:1.4fr 1fr 1.4fr;gap:clamp(20px,3vw,32px)}
  .footer-col:last-child{grid-column:1 / -1}
  .footer-cta{width:auto}
  .footer-nav--tight{flex-direction:row;flex-wrap:wrap;gap:18px;margin-top:12px}
}

@media (max-width:1024px){
  .nav-toggle{display:inline-flex}
  .header-main__inner{min-height:64px}
  .site-nav{
    display:none;
    position:absolute;left:0;right:0;top:100%;
    background:var(--bg-deep);
    border-top:2px solid var(--line);
    border-bottom:2px solid var(--line);
    box-shadow:0 12px 0 rgba(5,7,15,.85);
    max-height:min(72vh,520px);overflow-y:auto;
    margin-left:0;
  }
  .site-nav[data-open]{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;padding:6px 0}
  .site-nav__link{
    padding:15px var(--gutter);
    border-bottom:1px solid var(--line);
    border-left:3px solid transparent;
    font-size:16px;
  }
  .site-nav__link:hover{background:var(--mid)}
  .site-nav__link[aria-current="page"]{border-bottom-color:var(--line);border-left-color:var(--cyan)}
  .site-nav__num{font-size:12px}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:860px){
  .grid--3,.grid--2{grid-template-columns:1fr}
  .grid--offset > *:nth-child(even){transform:none}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-col:last-child{grid-column:1 / -1}
  .footer-note{max-width:none}
  .index-list__item{grid-template-columns:auto minmax(0,1fr);gap:12px}
  .index-list__meta{grid-column:2;white-space:normal}
}

@media (max-width:560px){
  .rail-link--soft{display:none}
  .header-rail__sub{display:none}
  .brand__badge{width:36px;height:36px;font-size:17px}
  .brand__title{font-size:16px}
  .brand__meta{display:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-contact > li{grid-template-columns:1fr;gap:2px}
  .to-top__text{display:none}
  .steps > li{padding-left:52px}
  .section-head{padding-bottom:12px}
}

/* =========================================================
   动效偏好
   ========================================================= */
@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;
  }
  .card:hover,.card:focus-visible,.btn:hover,.to-top:hover{transform:none}
  html.js [data-reveal]{opacity:1;transform:none}
}