:root{
  --paper:#f5f1e8; --paper-2:#ece6d8; --ink:#1d1b18; --ink-2:#4a463f; --mute:#8a8376;
  --line:rgba(29,27,24,.12); --cinnabar:#a8432f; --gold:#a88a55;
  --serif:"Songti SC","STSong","Noto Serif SC","Source Han Serif SC","SimSun",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1); --w:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.9 var(--sans);letter-spacing:.02em;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
::selection{background:rgba(168,67,47,.15)}
:focus-visible{outline:1px solid var(--cinnabar);outline-offset:4px}
.wrap{max-width:var(--w);margin:0 auto;padding:0 clamp(22px,5vw,56px)}
.grain{position:fixed;inset:0;pointer-events:none;z-index:100;opacity:.35;mix-blend-mode:multiply;
  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 baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .45 0 0 0 0 .4 0 0 0 0 .3 0 0 0 .08 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}

/* type */
.eyebrow{font-size:12px;letter-spacing:.42em;color:var(--cinnabar);margin:0 0 28px}
.display{font-family:var(--serif);font-weight:400;font-size:clamp(44px,7.4vw,104px);line-height:1.18;letter-spacing:.06em;margin:0}
.display.sm{font-size:clamp(36px,5vw,68px)}
.h2{font-family:var(--serif);font-weight:400;font-size:clamp(30px,3.6vw,48px);line-height:1.35;letter-spacing:.06em;margin:0}
h3{font-family:var(--serif);font-weight:400;letter-spacing:.05em}
.sub{color:var(--ink-2);max-width:34em;margin:24px 0 0}
.note{color:var(--mute);font-size:13px}
.center{text-align:center}
.muted{color:var(--mute);font-size:14px}

/* nav */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;display:flex;align-items:center;justify-content:space-between;
  padding:26px clamp(22px,5vw,56px);transition:padding .5s var(--ease),background .5s,backdrop-filter .5s}
.nav.scrolled{padding-top:14px;padding-bottom:14px;background:rgba(245,241,232,.82);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 1px 0 var(--line)}
.brand{display:flex;align-items:center;gap:14px}
.seal{width:34px;height:34px;display:grid;place-items:center;background:var(--cinnabar);color:#f7efe6;font-family:var(--serif);font-size:18px;border-radius:3px}
.brand-name{font-family:var(--serif);font-size:17px;letter-spacing:.18em}
.brand-name i{font-style:normal;color:var(--gold);margin:0 .3em}
.links{display:flex;gap:38px;font-size:14px;letter-spacing:.16em}
.links a{position:relative;color:var(--ink-2);transition:color .3s}
.links a::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:1px;background:var(--cinnabar);transform:scaleX(0);transition:transform .4s var(--ease)}
.links a:hover{color:var(--ink)} .links a:hover::after{transform:scaleX(1)}
.links .nav-cta{color:var(--cinnabar)}
.burger{display:none;background:none;border:0;width:36px;height:36px;padding:8px;cursor:pointer}
.burger span{display:block;height:1px;background:var(--ink);margin:7px 0;transition:transform .4s var(--ease)}
.burger[aria-expanded=true] span:first-child{transform:translateY(4px) rotate(45deg)}
.burger[aria-expanded=true] span:last-child{transform:translateY(-4px) rotate(-45deg)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.6em;height:52px;padding:0 34px;font:inherit;font-size:14px;letter-spacing:.24em;cursor:pointer;border-radius:0;transition:background .4s var(--ease),color .4s,border-color .4s}
.btn-ink{background:var(--ink);color:var(--paper);border:1px solid var(--ink)}
.btn-ink:hover{background:var(--cinnabar);border-color:var(--cinnabar)}
.btn-line{background:transparent;color:var(--ink);border:1px solid rgba(29,27,24,.35)}
.btn-line:hover{border-color:var(--ink);background:rgba(29,27,24,.04)}
.full{width:100%}

/* hero */
.hero{position:relative;min-height:100svh;display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:clamp(30px,5vw,80px);
  max-width:1440px;margin:0 auto;padding:130px clamp(22px,5vw,72px) 80px}
.lede{color:var(--ink-2);font-size:17px;margin:36px 0 48px;line-height:2}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-figure{margin:0;position:relative;aspect-ratio:4/5;overflow:hidden}
.hero-figure img{width:100%;height:100%;object-fit:cover;animation:breathe 28s ease-in-out infinite alternate}
.hero-figure figcaption{position:absolute;left:24px;bottom:20px;color:#f5f1e8;font-family:var(--serif);font-size:13px;letter-spacing:.5em;text-shadow:0 1px 8px rgba(0,0,0,.35)}
.vert{position:absolute;right:clamp(8px,1.6vw,26px);top:50%;transform:translateY(-50%);writing-mode:vertical-rl;font-family:var(--serif);font-size:12px;letter-spacing:.8em;color:var(--mute)}
@keyframes breathe{from{transform:scale(1.02)}to{transform:scale(1.1)}}

/* sections */
section{position:relative}
.sec-head{margin-bottom:clamp(48px,6vw,80px)}
.about{padding:clamp(110px,14vw,200px) 0;background:var(--paper-2);overflow:hidden}
.about-bg{position:absolute;inset:-10% 0;background-size:cover;background-position:center;opacity:.12;mix-blend-mode:multiply;will-change:transform}
.about-grid{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,7vw,120px)}
.about-copy p{font-size:17px;color:var(--ink-2);margin:0 0 1.2em}
.facts{display:grid;grid-template-columns:repeat(3,1fr);margin:56px 0 0;border-top:1px solid var(--line)}
.facts div{padding:28px 0 0}
.facts dt{font-family:var(--serif);font-size:clamp(34px,3.6vw,52px);line-height:1}
.facts small{font-size:14px;margin-left:4px;color:var(--mute)}
.facts dd{margin:12px 0 0;font-size:13px;color:var(--mute);letter-spacing:.12em}

/* courses */
.courses{padding-top:clamp(110px,14vw,190px);padding-bottom:clamp(90px,10vw,150px)}
.tabs{display:flex;gap:44px;border-bottom:1px solid var(--line);margin-bottom:64px}
.tab{background:none;border:0;padding:0 0 18px;font:inherit;font-family:var(--serif);font-size:20px;letter-spacing:.14em;color:var(--mute);cursor:pointer;position:relative}
.tab::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;background:var(--cinnabar);transform:scaleX(0);transform-origin:left;transition:transform .5s var(--ease)}
.tab.is-on{color:var(--ink)} .tab.is-on::after{transform:scaleX(1)}
.course-stage{display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,7vw,110px);align-items:start}
.course-title{font-size:clamp(26px,2.6vw,36px);margin:0 0 18px}
.course-desc{color:var(--ink-2);margin:0 0 40px}
.course-list{list-style:none;padding:0;margin:0 0 28px;counter-reset:c}
.course-list li{counter-increment:c;opacity:0;transform:translateY(10px);animation:in .6s var(--ease) forwards;animation-delay:calc(var(--i)*60ms)}
.course-list button{width:100%;display:flex;align-items:baseline;gap:22px;background:none;border:0;border-bottom:1px solid var(--line);padding:20px 0;font:inherit;text-align:left;cursor:pointer;color:var(--ink-2);transition:color .3s,padding .4s var(--ease)}
.course-list button::before{content:counter(c,decimal-leading-zero);font-size:11px;letter-spacing:.2em;color:var(--mute)}
.course-list button b{font-family:var(--serif);font-weight:400;font-size:20px;letter-spacing:.2em}
.course-list button span{margin-left:auto;font-size:12px;color:var(--mute);letter-spacing:.1em}
.course-list button:hover{color:var(--ink);padding-left:8px}
.course-list button[aria-pressed=true]{color:var(--cinnabar)}
.course-list button[aria-pressed=true]::before{color:var(--cinnabar)}
@keyframes in{to{opacity:1;transform:none}}
.course-figure{margin:0;position:sticky;top:110px}
.frame{aspect-ratio:4/4.5;overflow:hidden;background:var(--paper-2)}
.frame img{width:100%;height:100%;object-fit:cover;transition:opacity .6s var(--ease),transform 1.2s var(--ease)}
.frame img.swap{opacity:0;transform:scale(1.04)}
.course-figure figcaption{margin-top:16px;font-size:12px;letter-spacing:.32em;color:var(--mute)}

/* campus */
.campus{padding:clamp(100px,12vw,170px) 0;background:var(--ink);color:var(--paper)}
.campus .eyebrow{color:var(--gold)} .campus .sub{color:rgba(245,241,232,.7)} .campus .note{color:rgba(245,241,232,.5);margin-top:56px}
.banner{margin:0 0 clamp(60px,7vw,100px);aspect-ratio:21/8;overflow:hidden;position:relative}
.banner img{width:100%;height:100%;object-fit:cover;opacity:.85}
.banner figcaption{position:absolute;right:clamp(22px,5vw,56px);bottom:20px;font-size:12px;letter-spacing:.32em;color:rgba(245,241,232,.8)}
.campus-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:rgba(245,241,232,.14)}
.campus-card{background:var(--ink);padding:clamp(32px,4vw,56px)}
.campus-card .idx{font-family:var(--serif);color:var(--gold);font-size:13px;letter-spacing:.3em;margin:0}
.campus-card h3{font-size:clamp(28px,3vw,40px);margin:18px 0 6px}
.campus-card .sign{font-size:13px;letter-spacing:.24em;color:rgba(245,241,232,.55);margin:0 0 36px}
.campus-card dl{display:grid;grid-template-columns:1fr 1fr;margin:0 0 28px;padding:22px 0;border-top:1px solid rgba(245,241,232,.14);border-bottom:1px solid rgba(245,241,232,.14)}
.campus-card dt{font-size:12px;letter-spacing:.3em;color:rgba(245,241,232,.5)}
.campus-card dd{margin:6px 0 0;font-family:var(--serif);font-size:20px}
.campus-card>p:last-of-type{color:rgba(245,241,232,.72);margin:0}

/* audience */
.audience{padding-top:clamp(110px,14vw,190px);padding-bottom:clamp(110px,14vw,190px)}
.aud-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(40px,7vw,110px);align-items:center}
.aud-fig{margin:0;aspect-ratio:4/5;overflow:hidden}
.aud-fig img{width:100%;height:100%;object-fit:cover}
.aud-col article+article{margin-top:64px;padding-top:64px;border-top:1px solid var(--line)}
.tag{font-size:12px;letter-spacing:.36em;color:var(--cinnabar);margin:0}
.aud-col h3{font-size:clamp(24px,2.4vw,32px);margin:14px 0 16px}
.aud-col p{color:var(--ink-2)}
.ages{list-style:none;padding:0;margin:24px 0 16px;display:grid;grid-template-columns:1fr 1fr;gap:20px}
.ages li{display:flex;flex-direction:column;gap:4px}
.ages b{font-family:var(--serif);font-weight:400;font-size:18px;letter-spacing:.14em}
.ages span{font-size:13px;color:var(--mute)}

/* learn */
.learn{padding:clamp(110px,13vw,180px) 0;background:var(--paper-2)}
.learn-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(28px,4vw,64px)}
.learn-grid article{padding-top:32px;border-top:1px solid var(--ink)}
.num{font-family:var(--serif);font-size:clamp(44px,4.6vw,64px);line-height:1;margin:0 0 28px;color:var(--cinnabar)}
.num small{font-size:15px;color:var(--mute);margin:0 4px}
.learn-grid h3{font-size:22px;margin:0 0 12px}
.learn-grid p:last-child{color:var(--ink-2);font-size:15px;margin:0}

/* visit */
.visit{text-align:center;padding-top:clamp(130px,16vw,230px);padding-bottom:clamp(130px,16vw,230px)}
.visit .sub{margin:28px auto 48px}
.visit .note{margin-top:24px}

/* footer */
.foot{border-top:1px solid var(--line);padding:72px 0 36px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.foot-brand{font-family:var(--serif);font-size:20px;letter-spacing:.16em;margin:0 0 12px}
.foot h4{font-family:var(--serif);font-weight:400;font-size:16px;letter-spacing:.2em;margin:0 0 12px}
.foot-bottom{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-top:64px;padding-top:24px;border-top:1px solid var(--line);font-size:12px;color:var(--mute);letter-spacing:.1em}

/* dialog */
dialog{border:0;padding:0;width:min(460px,92vw);background:var(--paper);color:var(--ink);box-shadow:0 30px 80px rgba(0,0,0,.25)}
dialog::backdrop{background:rgba(29,27,24,.5);backdrop-filter:blur(4px)}
dialog[open]{animation:pop .5s var(--ease)}
@keyframes pop{from{opacity:0;transform:translateY(16px)}}
dialog form{padding:44px 40px 40px;position:relative}
dialog h3{font-size:26px;margin:0 0 8px}
dialog .eyebrow{margin-bottom:14px}
.x{position:absolute;top:14px;right:18px;background:none;border:0;font-size:26px;color:var(--mute);cursor:pointer}
dialog label{display:block;font-size:12px;letter-spacing:.24em;color:var(--mute);margin:24px 0 0}
dialog select{display:block;width:100%;margin-top:8px;padding:12px 0;font:inherit;font-size:16px;color:var(--ink);background:transparent;border:0;border-bottom:1px solid var(--line);border-radius:0;appearance:none;-webkit-appearance:none}
dialog select:focus{outline:0;border-color:var(--cinnabar)}
dialog .full{margin-top:36px}
.summary{margin:28px 0}
.summary div{display:flex;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--line)}
.summary dt{color:var(--mute);font-size:13px;letter-spacing:.2em} .summary dd{margin:0;font-family:var(--serif)}
.row{display:flex;gap:12px;margin-top:28px}.row .btn{flex:1;padding:0}

/* reveal */
[data-r]{opacity:0;transform:translateY(26px);transition:opacity 1.1s var(--ease),transform 1.1s var(--ease);transition-delay:var(--d,0s)}
[data-r=img]{transform:none;clip-path:inset(8% 0 8% 0)}
[data-r=img]{transition:opacity 1.2s var(--ease),clip-path 1.4s var(--ease)}
[data-r].in{opacity:1;transform:none;clip-path:inset(0)}

/* responsive */
@media (max-width:960px){
  .links{position:fixed;inset:0;flex-direction:column;justify-content:center;align-items:center;gap:30px;background:var(--paper);font-family:var(--serif);font-size:22px;
    clip-path:inset(0 0 100% 0);transition:clip-path .6s var(--ease)}
  .links.open{clip-path:inset(0)}
  .burger{display:block;position:relative;z-index:2}
  .hero{grid-template-columns:1fr;min-height:auto;padding-top:120px}
  .hero-figure{aspect-ratio:4/3.6;order:2}
  .vert{display:none}
  .about-grid,.course-stage,.aud-grid,.campus-grid{grid-template-columns:1fr}
  .course-figure{position:static;order:-1}
  .frame{aspect-ratio:4/5}
  .banner{aspect-ratio:16/9}
  .learn-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
}
@media (max-width:560px){
  .tabs{gap:26px}.tab{font-size:17px}
  .facts{grid-template-columns:1fr 1fr 1fr}
  .hero-actions .btn{flex:1;padding:0 12px;letter-spacing:.12em}
  .brand-name{font-size:15px;letter-spacing:.1em}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  [data-r]{opacity:1;transform:none;clip-path:none}
  .course-list li{opacity:1;transform:none}
}

.campus-contact{list-style:none;margin:28px 0 0;padding:0;display:grid;gap:14px}
.campus-contact li{margin:0;font-size:14px;line-height:1.7;color:rgba(245,241,232,.78)}
.campus-contact span{display:block;font-size:11px;letter-spacing:.3em;color:rgba(245,241,232,.45);margin-bottom:4px}
.campus-contact a{color:var(--gold);border-bottom:1px solid rgba(168,138,85,.35);transition:border-color .3s}
.campus-contact a:hover{border-bottom-color:var(--gold)}
.foot .muted a{color:inherit;border-bottom:1px solid rgba(138,131,118,.35)}
.foot .muted a:hover{border-bottom-color:var(--cinnabar)}
.campus-wechat{margin:32px 0 0;padding-top:28px;border-top:1px solid rgba(245,241,232,.14);text-align:center}
.campus-wechat figcaption{font-family:var(--serif);font-size:14px;letter-spacing:.3em;color:var(--gold);margin-bottom:16px}
.campus-wechat img{display:block;width:184px;height:184px;object-fit:contain;margin:0 auto;background:#fff;padding:12px;box-sizing:content-box;border-radius:4px;box-shadow:0 8px 24px rgba(0,0,0,.25)}

.foot-campus{display:flex;flex-direction:column;gap:0}
.foot-wechat{margin:18px 0 0;padding:0;text-align:left}
.foot-wechat img{display:block;width:112px;height:112px;object-fit:contain;background:#fff;padding:8px;box-sizing:content-box;border-radius:3px;border:1px solid var(--line)}
.foot-wechat figcaption{margin-top:8px;font-size:12px;letter-spacing:.16em;color:var(--mute)}
@media (max-width:860px){
  .foot-wechat img{width:104px;height:104px}
}

/* 手写双 Logo */
.brand-logo{height:30px;width:auto;display:block}
.brand-dot{width:1px;height:22px;background:var(--gold);opacity:.7}
@media (max-width:720px){.brand-logo{height:22px}.brand{gap:10px}}
.foot-bottom a{color:inherit;text-decoration:none}.foot-bottom a.icp:hover{color:var(--ink)}
/* sr-only + FAQ (2026-10-13 SEO) */
.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}
.faq{padding:96px 0 24px}
.faq-list{max-width:820px;margin-top:40px;border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{cursor:pointer;list-style:none;padding:22px 32px 22px 0;position:relative;font-family:var(--serif);font-size:18px;letter-spacing:.06em}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:4px;top:50%;transform:translateY(-50%);color:var(--cinnabar);font-size:22px;transition:transform .3s var(--ease)}
.faq-item[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq-item p{margin:0 0 22px;color:var(--mute);line-height:1.9;font-size:15px}