@font-face{font-family:YanYuanSerif;src:url('/assets/title-serif.woff2') format('woff2');font-weight:600;font-display:swap}
:root{--paper:#f8f5ee;--ink:#2c3530;--muted:#72766c;--red:#94070a;--line:rgba(72,65,51,.15);--serif:YanYuanSerif,"Noto Serif SC","Songti SC","STSong","SimSun",serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:28px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer}
button,a{-webkit-tap-highlight-color:transparent;touch-action:manipulation}
button:focus-visible,a:focus-visible{outline:3px solid var(--red);outline-offset:5px}
img{display:block;max-width:100%}
.wrap{width:min(1240px,calc(100% - 112px));margin-inline:auto}
.welcome{position:relative;isolation:isolate;overflow:hidden}
.scenery{position:absolute;inset:0 0 auto;z-index:-2;height:830px;pointer-events:none;background:#f4f0e5}
.scenery picture,.scenery img{width:100%;height:100%;display:block}
.scenery img{object-fit:cover;object-position:center top;opacity:.86}
.scenery::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,var(--paper) 0%,rgba(248,245,238,.7) 7%,transparent 29%),linear-gradient(90deg,rgba(248,245,238,.9),rgba(248,245,238,.65) 28%,rgba(248,245,238,.09) 54%,transparent 75%)}
.site-header{height:102px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:14px}
.brand-logo{width:70px;height:56px;object-fit:contain;flex:none;border-radius:3px}
.brand-text{display:grid;gap:7px}
.brand-text strong{font-size:16px;letter-spacing:1.5px;font-weight:600}
.brand-text>span{font-size:10px;letter-spacing:.8px;color:#6b7065}
nav{display:flex;align-items:center;gap:36px;font-size:13px;font-weight:500}
nav a{padding:12px 0;position:relative}
nav a:hover{color:var(--red)}
nav a[aria-current]::after{content:"";position:absolute;bottom:2px;left:calc(50% - 2px);width:4px;height:4px;background:var(--red);border-radius:50%}
nav a>span{display:inline-block;margin-left:12px}
.hero{position:relative;min-height:585px;display:flex;align-items:center;padding-block:47px 62px}
.hero-copy{position:relative;z-index:1}
h1{font-family:var(--serif);font-size:clamp(48px,4.8vw,68px);line-height:1.35;letter-spacing:2px;font-weight:600;margin:0 0 17px}
h1>span{display:block;white-space:nowrap}
h1>span:first-child{color:var(--red)}
h1>span:last-child{color:var(--ink)}
.pku-wordmark{width:4.65em;height:auto;margin-bottom:.2em}
.hero-english{font:18px/1.6 Georgia,"Times New Roman",serif;letter-spacing:.8px;margin:0 0 24px;color:#545d53}
.hero-description{font-size:14px;line-height:1.95;letter-spacing:1px;color:#60665d;margin:0 0 26px}
.hero-actions{display:flex;align-items:center;gap:14px}
.hero-button{position:relative;overflow:hidden;min-width:142px;min-height:48px;display:inline-flex;align-items:center;justify-content:center;padding:0 26px;border:1px solid rgba(255,255,255,.65);border-radius:999px;font-size:13px;font-weight:600;letter-spacing:1px;color:#780609;background:linear-gradient(135deg,rgba(255,255,255,.3),rgba(255,255,255,.06) 48%,rgba(255,255,255,.16));-webkit-backdrop-filter:blur(5px) saturate(135%);backdrop-filter:blur(5px) saturate(135%);box-shadow:0 5px 18px rgba(73,54,39,.08),inset 0 1px 1px rgba(255,255,255,.85),inset 0 -1px 1px rgba(92,65,49,.1);text-shadow:0 1px 3px rgba(255,255,255,.65);transition:background-color .25s,border-color .25s,box-shadow .25s,transform .25s}
.hero-button::before{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;background:linear-gradient(110deg,transparent 20%,rgba(255,255,255,.35) 48%,transparent 72%);opacity:0;transform:translateX(-100%);transition:transform .6s,opacity .3s}
.primary-button{background-color:rgba(148,7,10,.08);border-color:rgba(148,7,10,.24)}
.secondary-button{background-color:rgba(255,253,248,.08)}
@media(hover:hover){
  .hero-button:hover{background-color:rgba(255,255,255,.22);border-color:rgba(255,255,255,.9);box-shadow:0 8px 24px rgba(73,54,39,.12),inset 0 1px 1px rgba(255,255,255,.95),inset 0 -1px 1px rgba(92,65,49,.1);transform:translateY(-2px)}
  .primary-button:hover{background-color:rgba(148,7,10,.12);border-color:rgba(148,7,10,.32)}
  .hero-button:hover::before{opacity:1;transform:translateX(100%)}
}
.hero-button:active{transform:translateY(0) scale(.98)}
@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){.hero-button{background-color:rgba(255,253,248,.7)}}
@media(prefers-reduced-transparency:reduce){.hero-button{background:#f8f5ee;-webkit-backdrop-filter:none;backdrop-filter:none}.hero-button::before{display:none}}
.about{position:relative;display:grid;grid-template-columns:230px minmax(0,1fr);align-items:center;gap:56px;padding-block:58px 52px;border-bottom:1px solid var(--line)}
.about-identity img{width:100%;height:auto;border-radius:5px;box-shadow:0 8px 32px #41332f0c}
.about-content h2{margin-bottom:16px}
.about-content p{margin:0 0 16px;font-size:14px;line-height:2;color:#60665d;text-align:justify}
.about-content p strong{font-weight:600;color:#40483e}
.about-content .about-full-name{text-align:left}
.about-content .about-welcome{font-family:var(--serif);font-size:22px;font-weight:600;color:var(--red);margin:20px 0 0}
.channels{position:relative;padding-top:46px;padding-bottom:42px}
.section-heading{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:28px;gap:24px}
.section-kicker{font-size:10px;letter-spacing:2px;color:var(--red);margin:0 0 12px;font-weight:600}
h2{font-family:var(--serif);font-weight:600;letter-spacing:1px;font-size:27px;margin:0;line-height:1.5}
h2>span{color:var(--red)}
.section-description{font-size:11px;line-height:1.9;color:var(--muted);margin:0;text-align:right;letter-spacing:1px}
.platform-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:17px}
.platform-card{padding:24px 24px 0;background:rgba(255,254,251,.85);border:1px solid #e7e2d7;border-radius:7px;box-shadow:0 5px 18px #67553b04;transition:border-color .2s,box-shadow .2s,transform .2s}
.platform-card:hover{border-color:#c8beac;box-shadow:0 9px 26px #67553b0a;transform:translateY(-3px)}
.card-heading{display:flex;align-items:center;gap:12px}
.platform-logo{height:42px;width:42px;display:grid;place-items:center;border-radius:10px;flex:none;overflow:hidden}
.bilibili-logo{background:#e9f5fc}
.douyin-logo{background:#17171b}
.wechat-logo{background:#07c160}
.xiaohongshu-logo{background:#ff2442}
.card-heading>div{display:flex;flex-direction:column;justify-content:center;gap:3px;padding-top:3px}
.card-heading h3{font-size:16px;line-height:1.25;font-weight:600;margin:0;white-space:nowrap}
.card-heading div>span{display:block;font-size:8px;line-height:1.25;letter-spacing:1.2px;color:#929184}
.card-index{font:italic 13px Georgia,serif;color:#b8af9f;margin-left:auto}
.account-name{font-size:12px;font-weight:500;margin:21px 0 13px;text-align:center;letter-spacing:.3px;white-space:nowrap}
.qr-button{display:block;position:relative;padding:0;border:1px solid #eeece5;border-radius:5px;background:white;width:134px;height:134px;margin:0 auto 18px;transition:border-color .2s}
.qr-button:hover{border-color:var(--red)}
.qr-button img{border-radius:4px;width:132px;height:132px}
.qr-expand{position:absolute;right:-8px;bottom:-8px;width:23px;height:23px;line-height:21px;background:#fffefb;border:1px solid #e5e0d5;border-radius:4px;color:#7b7c72;font-size:18px;opacity:0;transition:opacity .2s}
.qr-button:hover .qr-expand,.qr-button:focus-visible .qr-expand{opacity:1}
.platform-link{background:transparent;width:100%;border:0;border-top:1px solid #e9e5dd;min-height:52px;display:flex;justify-content:space-between;align-items:center;font-size:11px;font-weight:500;text-align:left}
.platform-link>span{font-size:19px;font-weight:400}
.platform-link:hover{color:var(--red)}
.site-footer{border-top:1px solid var(--line);min-height:91px;display:flex;align-items:center;justify-content:space-between;gap:20px;color:#828376;font-size:10px}
.site-footer p{margin:0;display:flex;align-items:center;gap:12px}
.footer-logo{width:38px;height:30px;object-fit:contain;border-radius:2px}
.footer-domain{font:10px Georgia,serif;letter-spacing:2px}
.footer-meta{display:flex;flex-direction:column;align-items:flex-end;gap:8px}
.visitor-stats{display:flex;align-items:center;gap:9px;font-size:10px;line-height:1.5;letter-spacing:.3px}
.visitor-stats[hidden]{display:none}
.visitor-stats strong{font-weight:500;color:#60665d;font-variant-numeric:tabular-nums}
.stats-divider{opacity:.5}
.skip-link{position:fixed;left:12px;top:-80px;z-index:10;background:var(--red);padding:12px;color:white}
.skip-link:focus{top:12px}
.qr-dialog{border:1px solid #e2d9c8;border-radius:14px;padding:38px 32px 25px;width:min(420px,calc(100% - 32px));max-height:calc(100dvh - 32px);overflow:auto;background:#fffdf8;text-align:center;color:var(--ink);box-shadow:0 30px 100px #201d1833}
.qr-dialog::backdrop{background:rgba(36,39,33,.48);backdrop-filter:blur(5px)}
.dialog-close{position:absolute;top:10px;right:10px;width:40px;height:40px;display:grid;place-items:center;border:0;border-radius:50%;background:transparent;color:#77766a}
.dialog-close:hover{background:#f0ece3;color:var(--red)}
.qr-dialog h2{font-size:23px;letter-spacing:0;margin:5px 0}
#qr-instruction{font-size:13px;color:var(--muted);margin:10px 0 18px}
#qr-large{width:min(280px,100%);height:auto;margin:0 auto 18px;border:1px solid #e9e4da;border-radius:8px}
.download-button{background:var(--red);color:#fff9ef;min-height:44px;padding:12px 24px;display:flex;align-items:center;justify-content:center;gap:22px;border-radius:5px;font-size:13px}
.download-button:hover{background:#780609}
body.dialog-open{overflow:hidden}
@media(min-width:1700px){.scenery{height:950px}.hero{min-height:655px}.wrap{width:min(1360px,calc(100% - 160px))}h1{font-size:76px}.hero-description{font-size:16px}.hero-english{font-size:21px}.channels{padding-top:50px}}
@media(max-width:1100px){.wrap{width:calc(100% - 72px)}.platform-grid{gap:12px}.platform-card{padding:20px 16px 0}.card-heading{gap:9px}.card-index{display:none}.card-heading h3{font-size:14px}.hero{min-height:560px}.scenery{height:790px}.account-name{font-size:11px}.hero-english{font-size:16px}.about{grid-template-columns:190px minmax(0,1fr);gap:32px}}
@media(min-width:701px) and (max-width:900px){.scenery img{object-position:60% top}.platform-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.platform-card{padding:22px 28px 0}.card-index{display:block}.hero{min-height:550px}.section-description{max-width:160px}}
@media(max-width:700px){
  .wrap{width:calc(100% - 40px)}
  .site-header{height:80px;border-bottom-color:rgba(97,85,63,.13)}
  .brand{gap:10px}.brand-logo{width:52px;height:42px}
  .brand-text{gap:5px}.brand-text strong{font-size:12px;letter-spacing:.4px}.brand-text>span{font-size:8px;letter-spacing:.35px}
  nav{gap:0;font-size:11px}.nav-home{display:none}nav a>span{margin-left:4px}
  .scenery{top:80px;height:calc(100vw * 1.77778);min-height:0;max-height:none}
  .scenery img{opacity:.92;object-fit:cover;object-position:center bottom}
  .scenery::after{background:linear-gradient(0deg,var(--paper),rgba(248,245,238,.14) 13%,transparent 40%,rgba(248,245,238,.16) 63%,var(--paper) 100%)}
  .hero{min-height:calc(100vw * 1.77778);height:auto;align-items:flex-start;padding-top:24px;padding-bottom:360px}
  .hero-copy{width:100%;text-align:center}
  h1{font-size:clamp(34px,9.2vw,56px);line-height:1.4;letter-spacing:2px;margin-bottom:13px}
  .pku-wordmark{margin-inline:auto}
  .hero-english{font-size:14px;letter-spacing:.4px;margin-bottom:18px}
  .hero-description{font-size:11px;letter-spacing:.7px;line-height:1.85;margin-bottom:18px}
  .hero-actions{justify-content:center;gap:10px}
  .hero-button{min-width:126px;min-height:46px;padding:0 22px;font-size:12px}
  .about{grid-template-columns:minmax(0,1fr);gap:25px;padding-block:24px 32px}
  .about-identity{width:min(220px,65%);justify-self:center}
  .about-content h2{font-size:25px;margin-bottom:14px}
  .about-content p{font-size:13px;line-height:2;margin-bottom:16px;text-align:left}
  .about-content .about-welcome{font-size:21px;margin-top:20px}
  .channels{padding-top:30px;padding-bottom:32px}
  .section-heading{display:block;margin-bottom:22px}
  .section-kicker{font-size:8px;letter-spacing:1.5px;margin-bottom:8px}
  h2{font-size:23px;letter-spacing:0}
  .section-description{font-size:10px;line-height:1.8;text-align:left;margin-top:10px;letter-spacing:.4px}
  .section-description br{display:none}
  .platform-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
  .platform-card{padding:17px 13px 0;border-radius:6px;background:#fffefa}
  .card-heading{gap:8px}.platform-logo{width:32px;height:32px;border-radius:8px}.platform-logo img{width:26px;height:26px}.wechat-logo img{width:25px;height:25px}.xiaohongshu-logo img{width:32px;height:32px}
  .card-heading h3{font-size:12px}.card-heading div>span{font-size:6px;letter-spacing:.8px}
  .account-name{font-size:9px;letter-spacing:0;margin:18px -5px 12px}
  .qr-button{width:114px;height:114px}.qr-button img{width:112px;height:112px}.qr-expand{opacity:1;width:20px;height:20px;line-height:18px;font-size:16px;bottom:-5px;right:-5px}
  .platform-link{font-size:10px;min-height:46px}
  .site-footer{padding-block:20px;min-height:100px;flex-wrap:wrap;gap:14px}.site-footer p{gap:8px;font-size:9px}.footer-logo{width:32px;height:26px}.footer-domain{font-size:8px;letter-spacing:1px}.footer-meta{align-items:flex-start}.visitor-stats{font-size:9px;gap:7px}
}
@media(max-width:360px){.wrap{width:calc(100% - 28px)}.brand-text strong{font-size:11px}.brand-text>span{font-size:7px}.hero-english{font-size:12px}.platform-card{padding-inline:9px}.platform-grid{gap:9px}.card-heading{gap:6px}.card-heading h3{font-size:11px}h2{font-size:21px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}