:root{
  --blue:#3bb1ff;
  --red:#ff5252;
  --ink:#000;
  --paper:#fffdf7;
  --blue-l:#d7efff;
  --red-l:#ffe2e2;
  --bw:3px;
  --sh:5px 5px 0 #000;
  --font:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  padding-bottom:108px;
  font-family:var(--font);
  font-size:17px;
  line-height:1.7;
  color:var(--ink);
  background:var(--paper);
  overflow-x:hidden;
}
h1,h2,h3{font-weight:700;line-height:1.25}
img{display:block;max-width:100%;height:auto}
a{color:var(--ink)}
p{margin:0}
menu{list-style:none;margin:0;padding:0}
:focus-visible{outline:3px solid var(--red);outline-offset:2px}

/* 底部固定条 */
.bar{
  position:fixed;left:0;right:0;bottom:0;z-index:60;
  display:flex;align-items:center;gap:8px;
  padding:9px 10px calc(9px + env(safe-area-inset-bottom,0px));
  background:#fff;border-top:var(--bw) solid var(--ink);
}
.bar-nav{display:flex;align-items:center;gap:6px;flex:1 1 auto;min-width:0}
.grp{position:relative;flex:0 0 auto}
.grp summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:center;
  min-height:44px;padding:0 10px;font-size:15px;font-weight:700;white-space:nowrap;
  background:var(--blue-l);border:var(--bw) solid var(--ink);border-radius:10px;
  box-shadow:3px 3px 0 var(--ink);
}
.grp summary::-webkit-details-marker{display:none}
.grp[open] summary{background:var(--red);color:#fff;box-shadow:1px 1px 0 var(--ink);transform:translate(2px,2px)}
.grp menu{
  position:absolute;left:0;bottom:calc(100% + 12px);min-width:200px;
  display:grid;gap:6px;padding:8px;background:#fff;
  border:var(--bw) solid var(--ink);border-radius:12px;box-shadow:var(--sh);
}
.grp-r menu{left:auto;right:0}
.grp menu a{
  display:flex;align-items:center;min-height:44px;padding:0 12px;
  font-weight:700;text-decoration:none;border-radius:8px;
}
.grp menu a:hover,.grp menu a:focus{background:var(--blue)}
.bar-brand{
  margin:0 auto;padding:0 4px;font-size:18px;font-weight:700;
  text-decoration:none;white-space:nowrap;
}
.bar-cta{
  flex:0 0 auto;display:inline-flex;align-items:center;min-height:44px;padding:0 14px;
  font-size:16px;font-weight:700;text-decoration:none;color:#fff;background:var(--red);
  border:var(--bw) solid var(--ink);border-radius:10px;box-shadow:3px 3px 0 var(--ink);
}
.bar-cta:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}

/* 头部主视觉 */
.hero{
  position:relative;overflow:hidden;display:grid;grid-template-columns:1fr;
  background:var(--blue);border-bottom:var(--bw) solid var(--ink);
}
.hero-num{
  position:absolute;left:auto;right:6px;top:-14px;z-index:0;
  font-size:clamp(96px,30vw,230px);line-height:1;font-weight:700;
  color:#fff;opacity:.55;pointer-events:none;will-change:transform;
}
.hero-copy{
  position:relative;z-index:1;width:100%;max-width:1180px;margin:0 auto;
  padding:26px 18px 30px;text-align:left;
}
.eyebrow{
  display:inline-block;margin-bottom:12px;padding:3px 12px;font-size:15px;font-weight:700;
  background:#fff;border:var(--bw) solid var(--ink);border-radius:999px;box-shadow:3px 3px 0 var(--ink);
}
.hero h1{margin:0 0 20px;font-size:clamp(30px,8.4vw,54px);line-height:1.1;letter-spacing:-.01em}
.btn{
  display:inline-flex;align-items:center;min-height:48px;padding:0 22px;
  font-size:17px;font-weight:700;text-decoration:none;background:#fff;
  border:var(--bw) solid var(--ink);border-radius:10px;box-shadow:var(--sh);
}
.btn:active{transform:translate(3px,3px);box-shadow:2px 2px 0 var(--ink)}
.hero-art{position:relative;min-height:190px;background:var(--red);overflow:hidden}
.hero-blk{display:block;width:100%;height:100%;min-height:190px;background:var(--red)}
.hero-img{width:100%;height:100%;min-height:190px;object-fit:cover}

/* 主体 */
.wrap{max-width:1180px;margin:0 auto;padding:0 14px}
.cols{display:grid;grid-template-columns:1fr;gap:24px;margin:26px 0 34px}
.post{min-width:0}
.post > section{
  margin:0 0 26px;padding:20px 16px;background:#fff;
  border:var(--bw) solid var(--ink);border-radius:10px;box-shadow:var(--sh);
  scroll-margin-top:16px;scroll-margin-bottom:120px;
}
.post > section:nth-of-type(3n+1){background:var(--blue-l)}
.post > section:nth-of-type(3n+3){background:var(--red-l)}
.post section h2{
  margin:0 0 14px;padding-bottom:10px;font-size:clamp(21px,3.4vw,28px);
  border-bottom:var(--bw) solid var(--ink);
}
.post section h3{margin:20px 0 10px;font-size:19px}
.post section p{margin-bottom:14px}
.post section ul,.post section ol{margin:0 0 14px;padding-left:1.3em}
.post section li{margin-bottom:8px}
.post section a{
  font-weight:700;text-decoration:underline;
  text-decoration-thickness:2px;text-underline-offset:3px;
}
.post section blockquote{
  margin:0 0 14px;padding:12px 14px;background:#fff;border-radius:8px;
  border:var(--bw) solid var(--ink);border-left:8px solid var(--red);
}
.post section img{margin-bottom:14px;border:var(--bw) solid var(--ink);border-radius:8px}
.post section > :last-child{margin-bottom:0}

/* 右侧栏 */
.rail{display:grid;gap:18px;min-width:0}
.card{
  padding:16px;background:#fff;border:var(--bw) solid var(--ink);
  border-radius:10px;box-shadow:var(--sh);
}
.card-alt{background:var(--blue-l)}
.rail-t{margin:0 0 12px;font-size:16px}
.rail-t span{
  display:inline-block;padding:2px 9px;background:var(--blue);
  border:2px solid var(--ink);border-radius:6px;
}
.rail-list{margin:0;padding-left:1.3em}
.rail-list li{margin:0}
.rail-list a{
  display:flex;align-items:center;min-height:42px;padding:0 6px;
  font-weight:700;text-decoration:none;border-radius:6px;
}
.rail-list a:hover,.rail-list a:focus{background:var(--blue-l)}
.rail-cta{
  display:inline-flex;align-items:center;min-height:44px;padding:0 16px;
  font-weight:700;text-decoration:none;color:#fff;background:var(--red);
  border:var(--bw) solid var(--ink);border-radius:10px;box-shadow:3px 3px 0 var(--ink);
}

/* 页脚 */
.foot{
  display:flex;flex-direction:column;gap:12px;
  padding:22px 16px calc(18px + env(safe-area-inset-bottom,0px));
  background:var(--ink);color:#fff;border-top:var(--bw) solid var(--ink);
}
.foot-brand a{
  display:inline-flex;align-items:center;min-height:44px;
  font-size:24px;font-weight:700;text-decoration:none;color:var(--blue);
  letter-spacing:-.01em;
}
.foot-nav{display:flex;flex-wrap:wrap;gap:2px 12px;justify-content:center}
.foot-nav a{
  display:inline-flex;align-items:center;min-height:44px;padding:0 2px;
  font-size:15px;font-weight:700;text-decoration:none;color:#fff;
}
.foot-nav a:hover,.foot-nav a:focus{color:var(--blue);text-decoration:underline}
.foot-legal .copy{margin:0;font-size:15px;text-align:center;color:#cfcfcf}

/* 通用工具 */
.js .post > section{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
.js .post > section.in{opacity:1;transform:none}

/* 平板/桌面 */
@media (min-width:760px){
  .grp summary{padding:0 14px;font-size:16px}
  .bar{gap:14px;padding:10px 18px calc(10px + env(safe-area-inset-bottom,0px))}
  .bar-brand{font-size:20px}
  .hero-copy{padding:32px 20px 36px}
  .wrap{padding:0 18px}
  .post > section{padding:26px 22px}
  .foot{flex-direction:row;align-items:center;gap:22px}
  .foot-brand{flex:0 0 auto}
  .foot-nav{flex:1 1 auto}
  .foot-legal{flex:0 0 auto}
}
@media (min-width:900px){
  .hero{grid-template-columns:1.15fr .85fr;align-items:stretch}
  .hero-art{border-left:var(--bw) solid var(--ink)}
  .cols{grid-template-columns:minmax(0,1fr) 286px;align-items:start;gap:30px}
  .rail{position:sticky;top:22px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .post > section{opacity:1;transform:none;transition:none}
  .hero-num{will-change:auto}
}

button[aria-expanded]{min-width:44px;min-height:44px}