/* ===== 设计令牌 ===== */
:root{
  --night:#07151C;
  --panel:#0C2029;
  --ice:#ECF3F5;
  --ice-dim:#C6D6DC;
  --mist:#94ADB7;
  --accent:#FF5500;
  --accent-soft:#FF7A33;
  --amber:#E56B2A;
  --paper:#E8F0F2;
  --paper-ink:#0A1C24;
  --paper-mut:#4C6470;
  --line:rgba(236,243,245,.14);
  --line-strong:rgba(236,243,245,.28);
  --serif:"Noto Serif SC","Songti SC","SimSun",serif;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,"SF Mono","JetBrains Mono","Menlo",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--night);
  color:var(--ice);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
.topbar img,main img,footer img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
::selection{background:var(--accent);color:#fff}

.wrap{width:min(1240px,100% - 48px);margin-inline:auto}
@media (min-width:768px){.wrap{width:min(1240px,100% - 80px)}}

/* ===== 纸纹 ===== */
.grain{
  position:fixed;inset:0;z-index:9;pointer-events:none;opacity:.045;
  mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ===== 顶栏 ===== */
.topbar{
  position:sticky;top:0;z-index:8;
  backdrop-filter:blur(0px);
  background:linear-gradient(180deg,rgba(7,21,28,.92),rgba(7,21,28,.72));
  border-bottom:1px solid var(--line);
}
.topbar-in{display:flex;align-items:center;justify-content:space-between;gap:16px;height:66px}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand-logo{flex:none;width:auto;height:32px;display:block;object-fit:contain}
.brand-sub{color:var(--mist);font-size:13px;white-space:nowrap;border-left:1px solid var(--line-strong);padding-left:10px}
.brand-sub:hover{color:var(--ice)}
.nav{display:none;gap:30px;font-size:15px;color:var(--ice-dim)}
.nav a{position:relative;padding:4px 0}
.nav a:hover{color:var(--ice)}
.nav a::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;background:var(--accent);transition:right .3s ease}
.nav a:hover::after{right:0}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:1px solid var(--line-strong);background:transparent;color:var(--ice);
  padding:11px 20px;font-size:15px;min-height:44px;cursor:pointer;
  transition:background .25s,border-color .25s,color .25s;
}
.btn:hover{border-color:var(--accent);color:var(--accent)}
.btn-solid{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:500}
.btn-solid:hover{background:var(--accent-soft);border-color:var(--accent-soft);color:#fff}
.btn-top{padding:9px 16px;font-size:14px}

/* ===== hero ===== */
.hero{position:relative;overflow:hidden;padding-block:64px 0;border-bottom:1px solid var(--line)}
.hero-bg{position:absolute;inset:0;z-index:0;pointer-events:none}
.hero-bg .crack{position:absolute;inset:0;opacity:.5}
#snow{position:absolute;inset:0;width:100%;height:100%}
.hero-in{position:relative;z-index:2;display:grid;gap:44px}
.hero-copy{min-width:0;align-self:center}
.kicker{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--mist);letter-spacing:.06em;margin-bottom:26px}
.kicker .dot{width:6px;height:6px;background:var(--accent);border-radius:50%;flex:none}
h1{
  font-family:var(--serif);font-weight:700;margin:0 0 26px;
  font-size:clamp(40px,10.5vw,76px);line-height:1.14;letter-spacing:-.005em;
  text-wrap:balance;
}
h1 .thin{display:block;font-weight:600;color:var(--ice-dim);font-size:.62em;line-height:1.5;margin-top:.28em;letter-spacing:.01em}
.hero-lede{max-width:34em;color:var(--ice-dim);font-size:17px;margin:0 0 34px}
.hero-lede strong{color:var(--ice);font-weight:500}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:44px}
.hero-meta{display:grid;gap:0;border-top:1px solid var(--line);max-width:640px}
.hero-meta div{display:grid;gap:2px;padding:14px 0;border-bottom:1px solid var(--line)}
.hero-meta span.l{font-size:12px;color:var(--mist);letter-spacing:.1em}
.hero-meta span.v{font-size:15px;color:var(--ice)}
.hero-figure{position:relative;min-width:0}
.hero-figure img{
  width:100%;height:100%;min-height:320px;max-height:640px;object-fit:cover;object-position:50% 38%;
  filter:saturate(.85) contrast(1.02);
}
.hero-figure::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(7,21,28,.26) 0%,rgba(7,21,28,.08) 36%,rgba(7,21,28,.55) 74%,rgba(7,21,28,.94) 100%);
  pointer-events:none;
}
.hero-figure figcaption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;padding:14px 16px;
  font-size:12.5px;color:var(--ice-dim);letter-spacing:.04em;
  text-shadow:0 1px 8px rgba(4,12,16,.85);
}
.hero-figure figcaption b{color:var(--ice-dim);font-weight:500}

/* ===== 通用 section ===== */
section{padding-block:clamp(68px,10vw,128px)}
.sec-head{max-width:52em;margin-bottom:clamp(36px,5vw,60px)}
.sec-num{font-family:var(--mono);font-size:13px;color:var(--accent);letter-spacing:.14em;display:block;margin-bottom:16px}
h2{font-family:var(--serif);font-weight:700;font-size:32px;line-height:1.32;margin:0 0 20px;text-wrap:balance}
.sec-lede{color:var(--mist);margin:0;max-width:40em;font-size:16px;line-height:1.8}

/* ===== 关于蜗牛学苑 ===== */
.about{background:var(--night)}
.footprint{display:grid;grid-template-columns:1fr;border-top:1px solid var(--line)}
.fp-item{display:grid;gap:2px;padding:16px 0;border-bottom:1px solid var(--line)}
.fp-year{font-family:var(--mono);font-size:12.5px;color:var(--mist);letter-spacing:.06em}
.fp-item b{font-family:var(--serif);font-size:18px;font-weight:600;color:var(--ice);line-height:1.5}
.fp-item small{font-size:16px;color:var(--mist);line-height:1.65}
.fp-item.new .fp-year,.fp-item.new b{color:var(--amber)}
.ways{display:grid;gap:0;margin:clamp(32px,5vw,48px) 0 0;border-top:1px solid var(--line)}
.way{padding:22px 0;border-bottom:1px solid var(--line)}
.way h3{font-size:18px;font-weight:500;margin:0 0 8px;color:var(--ice)}
.way p{margin:0;color:var(--mist);font-size:16px;line-height:1.78}
.north-head{margin-top:clamp(46px,7vw,80px);max-width:52em}
.north-head h3{font-family:var(--serif);font-size:24px;font-weight:600;line-height:1.45;margin:0 0 12px;color:var(--ice)}
.north-head p{margin:0;color:var(--mist);font-size:16px;line-height:1.8}
.city-banner{margin:clamp(26px,4vw,40px) 0 22px}
.city-banner img{width:100%;aspect-ratio:16/10;object-fit:cover;object-position:50% 45%;filter:saturate(.95)}
.city-banner figcaption{margin-top:14px;font-size:16px;color:var(--mist);line-height:1.7;max-width:44em}
.city-banner figcaption b{display:block;font-family:var(--serif);font-size:18px;color:var(--ice);font-weight:600;margin-bottom:4px}
.city-photos{display:grid;gap:20px;grid-template-columns:1fr}
.city-photos figure{margin:0;min-width:0}
.city-photos img{width:100%;aspect-ratio:4/5;object-fit:cover;filter:saturate(.92)}
.city-photos figcaption{margin-top:14px;font-size:16px;color:var(--mist);line-height:1.7}
.city-photos figcaption b{display:block;font-family:var(--serif);font-size:18px;color:var(--ice);font-weight:600;margin-bottom:4px}
.city-why{display:grid;gap:0;margin-top:clamp(40px,6vw,64px);border-top:1px solid var(--line)}
.why-row{display:grid;gap:6px;padding:22px 0;border-bottom:1px solid var(--line)}
.why-row h3{font-size:18px;font-weight:500;margin:0;color:var(--ice)}
.why-row p{margin:0;color:var(--mist);font-size:16px;line-height:1.75}

/* ===== 专业（冰面浅色区） ===== */
.major{background:var(--paper);color:var(--paper-ink)}
.major .sec-num{color:#8A4A32}
.major h2{color:var(--paper-ink)}
.major .sec-lede{color:var(--paper-mut)}
.tl{display:grid;border-top:1px solid rgba(10,28,36,.16)}
.ladder{display:grid;gap:28px}
.ladder-col{min-width:0;padding-left:18px;border-left:1px solid rgba(10,28,36,.16)}
.ladder-col h3{margin:0 0 18px;font-size:16px;font-weight:600;line-height:1.4;color:var(--paper-ink)}
.ladder-item{display:grid;grid-template-columns:36px minmax(0,1fr);gap:2px 10px;margin:0 0 18px;align-items:start}
.ladder-item:last-child{margin-bottom:0}
.ladder-lv{font-family:var(--mono);font-size:13px;font-weight:700;color:var(--accent);letter-spacing:.02em;padding-top:3px}
.ladder-item b{display:block;font-size:15px;font-weight:600;line-height:1.45;color:var(--paper-ink)}
.ladder-item p{margin:4px 0 0;font-size:13.5px;line-height:1.55;color:var(--paper-mut)}
.stack{
  margin-top:clamp(40px,6vw,64px);
  padding-top:28px;
  border-top:1px solid rgba(10,28,36,.16);
}
.stack > h3{
  font-family:var(--serif);
  font-size:24px;
  font-weight:600;line-height:1.45;
  letter-spacing:0;color:var(--paper-ink);
  margin:0 0 22px;
  width:fit-content;
  padding-bottom:8px;
  border-bottom:2px solid var(--accent);
}

.tech-pills{
  display:flex;flex-wrap:wrap;gap:8px;
  padding:18px 18px 16px;
  background:rgba(255,255,255,.62);
  border:1px solid rgba(10,28,36,.1);
}
.pill{
  display:inline-flex;align-items:center;
  padding:6px 14px;border-radius:999px;
  font-size:13.5px;font-weight:500;line-height:1.45;
  border:1px solid transparent;
}
.pill-core{background:#D9E6EA;color:#16424E;border-color:rgba(22,66,78,.1)}
.pill-rag{background:#CFE0E6;color:#0F3A46;border-color:rgba(15,58,70,.1)}
.pill-eng{background:#D5EBE3;color:#1F5C4A;border-color:rgba(31,92,74,.12)}
.pill-cv{background:#F3E0D2;color:#8A4A32;border-color:rgba(138,74,50,.16)}
.tech-note{
  margin:18px 0 0;padding:16px 18px;
  background:rgba(22,66,78,.06);
  border-left:3px solid #16424E;
  color:var(--paper-mut);font-size:16px;line-height:1.8;
}
.tech-note b{color:var(--paper-ink);font-weight:500}
.note{margin-top:22px;font-size:16px;color:var(--paper-mut);max-width:46em}
.pool-lede{margin:0 0 16px;color:var(--paper-mut);font-size:16px;line-height:1.8;max-width:46em}
.pool{display:grid;gap:14px}
.pool-tier{
  padding:20px 20px 18px;
  background:#fff;
  border:1px solid rgba(10,28,36,.1);
  border-top:3px solid;
}
.pool-t1{border-top-color:#16424E;background:linear-gradient(180deg,#eef4f6,#fff 42%)}
.pool-t2{border-top-color:#3A8A96;background:linear-gradient(180deg,#eef6f7,#fff 42%)}
.pool-t3{border-top-color:#2A7A5C;background:linear-gradient(180deg,#eef6f2,#fff 42%)}
.pool-t4{border-top-color:var(--accent);background:linear-gradient(180deg,#f7efe8,#fff 42%)}
.pool-tier h4{
  margin:0 0 14px;font-family:var(--serif);font-size:18px;font-weight:600;
  color:var(--paper-ink);display:grid;gap:6px;
}
.pool-t1 h4::before,.pool-t2 h4::before,.pool-t3 h4::before,.pool-t4 h4::before{
  font-family:var(--mono);font-size:11.5px;font-weight:500;letter-spacing:.14em;
}
.pool-t1 h4::before{content:"TIER 01";color:#16424E}
.pool-t2 h4::before{content:"TIER 02";color:#3A8A96}
.pool-t3 h4::before{content:"TIER 03";color:#2A7A5C}
.pool-t4 h4::before{content:"TIER 04";color:#8A4A32}
.pool-items{display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none}
.pool-items li{
  display:inline-flex;align-items:center;
  padding:6px 12px;
  background:rgba(255,255,255,.85);
  border:1px solid rgba(10,28,36,.1);
  font-size:14.5px;color:#1a3340;line-height:1.45;
}
.who{display:grid;gap:14px;margin-top:0;counter-reset:who}
.who-row{
  padding:22px 20px 20px;
  background:#fff;
  border:1px solid rgba(10,28,36,.1);
  counter-increment:who;
}
.who-row::before{
  content:counter(who, decimal-leading-zero);
  font-family:var(--mono);font-size:13px;color:#8A4A32;
  letter-spacing:.1em;display:block;margin-bottom:10px;
}
.who-row h3{font-family:var(--serif);font-size:20px;font-weight:600;margin:0 0 8px;color:var(--paper-ink)}
.who-row p{margin:0;color:var(--paper-mut);font-size:16px;line-height:1.75}
.pbet-en{margin:0 0 20px;font-size:13px;letter-spacing:.12em;color:var(--paper-mut);text-transform:uppercase}
.pbet-lead{
  display:grid;gap:16px;
  padding:24px 22px;
  background:linear-gradient(135deg,rgba(255,85,0,.09),rgba(22,66,78,.05));
  border:1px solid rgba(138,74,50,.18);
}
.pbet-eyebrow{margin:0 0 10px;font-size:12px;letter-spacing:.14em;color:#8A4A32;font-family:var(--mono)}
.pbet-lead h4{font-family:var(--serif);font-size:18px;font-weight:600;line-height:1.4;margin:0;color:var(--paper-ink)}
.pbet-lead p{margin:0;font-size:16px;color:var(--paper-mut);line-height:1.8}
.pbet-lead p b{color:var(--paper-ink);font-weight:500}
.pbet-points{display:grid;gap:0px;margin-top:14px}
.pbet-point{
  padding:20px 18px;
  background:#fff;
  border:1px solid rgba(10,28,36,.1);
}
.pbet-num{font-family:var(--mono);font-size:16px;color:#8A4A32;letter-spacing:.08em;display:block;margin-bottom:8px}
.pbet-point h4,.pbet-step h4{font-family:var(--serif);font-size:18px;font-weight:600;margin:0 0 6px;color:var(--paper-ink)}
.pbet-point p,.pbet-step p{margin:0;font-size:16px;color:var(--paper-mut);line-height:1.75}
.pbet-flow{
  display:grid;gap:0;margin-top:14px;
  background:#fff;
  border:1px solid rgba(10,28,36,.1);
}
.pbet-step{padding:20px 18px;border-bottom:1px solid rgba(10,28,36,.08)}
.pbet-step:last-child{border-bottom:none}
.career{display:grid;gap:14px}
.career-col{
  padding:22px 22px 20px;
  background:#fff;
  border:1px solid rgba(10,28,36,.1);
}
.career-col:first-child{border-top:3px solid #16424E}
.career-col:last-child{border-top:3px solid var(--accent)}
.career-col h4{font-family:var(--serif);font-size:20px;font-weight:600;margin:0 0 14px;color:var(--paper-ink)}
.career-col p{margin:0;color:var(--paper-mut);font-size:16px;line-height:1.8}
.career-tags{display:flex;flex-wrap:wrap;gap:8px}
.career-tags span{
  display:inline-flex;padding:6px 12px;
  background:#E8F0F2;border:1px solid rgba(22,66,78,.12);
  font-size:14.5px;color:#16424E;line-height:1.45;
}
.career-col:last-child p{padding-top:2px}

/* ===== 演示 ===== */
.demo{background:var(--panel);border-block:1px solid var(--line)}
.demo-grid{display:grid;gap:32px;align-items:center;}
.proj{margin-top:30px;border-top:1px solid var(--line);padding-top:16px}
.proj-h{font-size:18px;letter-spacing:0;color:var(--ice);font-weight:500;margin-bottom:4px}
.proj-list{margin:0;padding:0;list-style:none;display:grid}
.proj-list li{display:grid;gap:3px;padding:13px 0;border-bottom:1px solid var(--line)}
.proj-list b{font-size:18px;font-weight:500;color:var(--ice)}
.proj-list span{font-size:16px;color:var(--mist);line-height:1.7}
.term{border:1px solid var(--line-strong);background:#061419;min-width:0}
.term-bar{display:flex;align-items:center;gap:8px;padding:12px 16px;border-bottom:1px solid var(--line);font-family:var(--mono);font-size:12.5px;color:var(--mist)}
.term-bar .lights{display:flex;gap:6px}
.term-bar .lights i{width:8px;height:8px;border-radius:50%;background:#22414E;display:block}
.term-body{padding:20px 18px 22px;font-family:var(--mono);font-size:14px;line-height:1.8;min-height:240px}
.ask{color:var(--ice);margin-bottom:16px}
.ask em{color:var(--mist);font-style:normal}
.log{display:grid;gap:12px}
.log-item{opacity:.42;transition:opacity .35s ease;border-left:2px solid transparent;padding-left:12px}
.log-item.on{opacity:1;border-left-color:var(--accent)}
.log-tag{font-size:11.5px;color:var(--accent);letter-spacing:.1em}
.log-txt{color:var(--ice-dim);font-family:var(--sans);font-size:16px;line-height:1.7}
.answer{margin-top:16px;padding-top:14px;border-top:1px dashed var(--line-strong);color:var(--ice);font-family:var(--sans);font-size:16px;line-height:1.8;opacity:0;transition:opacity .4s ease}
.answer.on{opacity:1}
.term-foot{display:flex;flex-wrap:wrap;gap:10px;padding:0 18px 20px}
.term-foot .hint{font-size:12.5px;color:var(--mist);align-self:center}

/* ===== 校区 ===== */
.campus{background:var(--night)}
.campus-grid{display:grid;gap:24px;align-items:stretch}
.addr{border-top:1px solid var(--line-strong);padding-top:22px;min-width:0}
.campus-aerial{
  margin:0;position:relative;overflow:hidden;min-width:0;
  border:1px solid var(--line);background:#0A1B23;
}
.campus-aerial img{
  width:100%;height:100%;min-height:280px;
  object-fit:cover;object-position:36% 58%;
  filter:saturate(.86) contrast(1.05) brightness(.94);
}
.campus-aerial::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(7,21,28,.18) 0%,rgba(7,21,28,.04) 42%,rgba(7,21,28,.78) 100%);
}
.campus-aerial figcaption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:14px 16px;font-size:16px;color:var(--ice-dim);line-height:1.65;
  text-shadow:0 1px 8px rgba(4,12,16,.85);
}
.campus-aerial figcaption b{
  display:block;font-family:var(--serif);font-size:18px;
  color:var(--ice);font-weight:600;margin-bottom:2px;
}
.addr-label{font-size:12px;letter-spacing:.12em;color:var(--accent);margin-bottom:12px}
.addr-main{font-family:var(--serif);font-size:24px;line-height:1.5;font-weight:600;margin:0 0 8px}
.addr-sub{color:var(--mist);font-size:16px;margin:0 0 26px}
.rows{display:grid;gap:0}
.row{display:grid;grid-template-columns:76px 1fr;gap:12px;padding:15px 0;border-bottom:1px solid var(--line);align-items:start}
.row dt{font-size:13px;color:var(--mist);letter-spacing:.06em;margin:0;padding-top:2px}
.row dd{margin:0;font-size:16px;color:var(--ice-dim);line-height:1.75}
.row dd b{color:var(--ice);font-weight:500}
.map{border:1px solid var(--line);background:#0A1B23;padding:8px;margin:44px 0 0}
.map svg{width:100%;height:auto;display:block}
.map-cap{display:flex;justify-content:space-between;gap:12px;padding:10px 6px 2px;font-size:12px;color:var(--mist)}
.map-cap span:last-child{white-space:nowrap}

/* 窄屏：换成纵向到校路线条 */
.route-strip{display:none;list-style:none;margin:32px 0 0;padding:18px 0 0;border-top:1px solid var(--line-strong)}
.route-step{display:grid;grid-template-columns:34px 22px 1fr;align-items:stretch}
.route-idx{font-family:var(--mono);font-size:12px;color:var(--mist);padding-top:15px;letter-spacing:.04em}
.route-rail{position:relative}
.route-rail::before{content:"";position:absolute;left:50%;top:0;bottom:0;width:1px;background:rgba(236,243,245,.22);transform:translateX(-50%)}
.route-rail i{position:absolute;left:50%;top:19px;width:8px;height:8px;border-radius:50%;background:var(--accent);transform:translateX(-50%)}
.route-step:last-child .route-rail::before{bottom:auto;height:24px}
.route-body{padding:11px 0 20px 8px;font-size:16px;color:var(--mist);line-height:1.75}
.route-body b{display:block;font-size:18px;color:var(--ice);font-weight:500;margin-bottom:2px}
@media (max-width:699px){
  .map{display:none}
  .route-strip{display:grid}
}

/* ===== 页脚 ===== */
footer{background:#041016;border-top:1px solid var(--line);padding-block:48px}
.foot-in{display:grid;gap:22px}
.foot-brand{font-family:var(--serif);font-size:20px;font-weight:600}
.foot-brand span{display:block;font-family:var(--sans);font-size:13px;color:var(--mist);font-weight:400;margin-top:6px;letter-spacing:.04em}
.foot-lines{display:grid;gap:6px;font-size:13.5px;color:var(--mist);line-height:1.8}

/* ===== 响应式 ===== */
@media (min-width:700px){
  .city-banner img{aspect-ratio:21/9}
  .city-photos{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
  .city-photos img{aspect-ratio:4/3}
  .footprint{grid-template-columns:repeat(3,minmax(0,1fr))}
  .fp-item{padding:20px 20px;border-bottom:1px solid var(--line)}
  .fp-item:nth-child(3n+1){border-left:none}
  .fp-item:nth-child(3n){padding-right:0}
  .fp-item:nth-child(n){border-left:1px solid var(--line)}
  .fp-item:nth-child(3n){border-right:1px solid var(--line) ;}
  .ways{grid-template-columns:repeat(3,minmax(0,1fr));border-bottom:1px solid var(--line)}
  .way{padding:22px 24px 22px 0;border-bottom:none}
  .way + .way{border-left:1px solid var(--line);padding-left:24px}
  .way:last-child{padding-right:0}
  .city-why{grid-template-columns:repeat(3,minmax(0,1fr));border-bottom:1px solid var(--line)}
  .why-row{border-bottom:none;padding-right:24px}
  .why-row + .why-row{border-left:1px solid var(--line);padding-left:24px}
  .ladder{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 32px}
  .pool{grid-template-columns:repeat(2,minmax(0,1fr))}
  .who{grid-template-columns:repeat(3,minmax(0,1fr))}
  .who-row{padding:24px 22px}
  .who-row + .who-row{border-left:none;padding-left:22px}
  .pbet-lead{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:36px;align-items:center;padding:28px 30px}
  .pbet-points,.pbet-flow{grid-template-columns:repeat(3,minmax(0,1fr))}
  .pbet-point,.pbet-step{border-bottom:none;padding:22px;border-right: none}
  .pbet-point + .pbet-point,.pbet-step + .pbet-step{border-left:1px solid rgba(10,28,36,.1);padding-left:22px}
  .pbet-step + .pbet-step{position:relative;padding-left:36px}
  .career{grid-template-columns:repeat(2,minmax(0,1fr))}
  .career-col{padding:26px 24px}
  .career-col + .career-col{border-left:none;padding-left:24px;padding-right:24px}
  .row{grid-template-columns:88px 1fr}
  .foot-in{grid-template-columns:1fr 1fr;align-items:start}
}
@media (min-width:900px){
  .topbar-in{height:74px}
  .brand-logo{height:36px}
  .nav{display:flex}
  .ladder{grid-template-columns:repeat(4,minmax(0,1fr));gap:0 28px}
  .hero{padding-block:44px 0}
  .hero-in{grid-template-columns:minmax(0,1.05fr) minmax(0,.82fr);gap:56px;align-items:stretch}
  .hero-meta{grid-template-columns:repeat(3,minmax(0,1fr));border-bottom:1px solid var(--line)}
  .hero-meta div{border-bottom:none;padding-right:18px}
  .hero-meta div + div{border-left:1px solid var(--line);padding-left:18px}
  .hero-figure img{height:640px;min-height:0}
  .demo-grid{grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:48px}
  .campus-grid{grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:40px}
  .campus-aerial img{min-height:0;height:100%}
  .campus-aerial{min-height:100%}
}
@media (min-width:1100px){
  .hero{padding-block:56px 0}
  .hero-figure img{height:700px}
}

/* ===== 动画 ===== */
.rv{opacity:0;transform:translateY(14px);transition:opacity .8s cubic-bezier(.22,1,.36,1),transform .8s cubic-bezier(.22,1,.36,1)}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none;transition:none}
  .log-item{transition:none}
}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}