:root{color-scheme:light;--page:#f5f7f4;--surface:#fff;--ink:#172d23;--muted:#5c7065;--line:#dde5de;--accent:#206448;--soft:#e7efe6;font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--page);font-synthesis:none}
*{box-sizing:border-box}body{margin:0;background:var(--page);font-size:16px;line-height:1.7}a{color:inherit}button,input,select,textarea{font:inherit}:focus-visible{outline:3px solid #4a9072;outline-offset:4px}.skip-link{position:absolute;left:16px;top:-100px;z-index:20;background:var(--accent);color:#fff;padding:10px 16px}.skip-link:focus{top:12px}
.portal-header{background:var(--surface);border-bottom:1px solid var(--line)}.portal-header-inner{max-width:1200px;margin:auto;padding:12px 32px;display:flex;flex-wrap:wrap;align-items:center;gap:16px 36px}.portal-brand{display:block;position:relative;width:180px;aspect-ratio:2/1;flex-shrink:0;overflow:hidden;border-radius:8px}.portal-brand img{position:absolute;width:112.2807%;max-width:none;height:auto;left:-12.2807%;top:-57.8947%}.portal-nav{display:flex;gap:5px;flex-wrap:wrap}.portal-nav a{text-decoration:none;padding:10px 14px;border-radius:8px;font-size:14px;color:var(--muted)}.portal-nav a:hover,.portal-nav a[aria-current=page]{background:var(--soft);color:var(--accent)}
.portal-main{max-width:1200px;margin:auto;padding:40px 32px 64px;min-height:calc(100vh - 190px)}.hero{max-width:800px;padding:6px 0 34px}.eyebrow{font-size:12px;letter-spacing:1.8px;color:var(--accent);margin:0 0 12px;font-weight:500}h1{font-size:42px;line-height:1.3;letter-spacing:-1px;margin:0 0 16px;font-weight:600}h2{font-size:20px;font-weight:600;margin:0 0 12px}h3{font-size:17px;font-weight:600;margin:0 0 8px}.intro{font-size:16px;line-height:1.9;margin:0;color:var(--muted)}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.action{display:inline-flex;gap:18px;align-items:center;justify-content:space-between;background:var(--surface);border:1px solid var(--line);border-radius:9px;padding:11px 17px;min-height:46px;text-decoration:none;font-size:14px;white-space:nowrap}.action:hover{border-color:var(--accent)}.action.primary{background:var(--accent);border-color:var(--accent);color:#fff}.action.primary:hover{background:#174e37}.section-head{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;margin:0 0 18px}.section-head h2{margin:0}.section-head p{margin:0;font-size:13px;color:var(--muted)}
.column-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.column-card{display:flex;flex-direction:column;gap:10px;border:1px solid var(--line);background:var(--surface);padding:25px;border-radius:13px;text-decoration:none;transition:border-color .15s,transform .15s}.column-card:hover{border-color:var(--accent);transform:translateY(-2px)}.card-heading{display:flex;justify-content:space-between;gap:12px;align-items:center}.card-heading h3{margin:0}.card-heading span{font-size:20px;color:var(--accent)}.column-card p{font-size:14px;line-height:1.8;color:var(--muted);margin:0}.card-link{font-size:13px;color:var(--accent);margin-top:auto}
.entry{display:flex;align-items:center;justify-content:space-between;gap:26px;padding:26px;border:1px solid var(--line);border-radius:12px;background:var(--surface);margin-bottom:16px}.entry>div{min-width:0}.entry h2{font-size:21px}.entry p{margin:0;color:var(--muted);font-size:15px}.entry .eyebrow{font-size:12px;margin-bottom:10px;color:var(--accent)}.entry .action{flex-shrink:0}.guide-block{margin-top:30px}.guide-block>p{max-width:900px;color:var(--muted);margin:0}.steps{list-style:none;counter-reset:step;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:25px;padding:0;margin:18px 0}.steps li{counter-increment:step;border-top:1px solid var(--line);padding-top:16px}.steps li::before{content:"0" counter(step);display:block;color:var(--accent);font-size:13px;margin-bottom:8px}.steps strong{font-weight:600;font-size:16px}.steps p{font-size:14px;color:var(--muted);margin:8px 0 0}.example-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.example-grid article{border-left:3px solid #c5d9c7;padding:3px 20px}.example-grid p{margin:0;font-size:14px;color:var(--muted)}.label{display:block;font-size:12px;color:var(--accent);margin-bottom:10px}.note{margin-top:30px;padding:18px 20px;background:var(--soft);border-radius:8px;font-size:13px;color:var(--muted)}.teacher-panel{margin-top:32px;border-top:1px solid var(--line);padding-top:24px}.teacher-panel p{font-size:14px;color:var(--muted);margin:0}
.portal-footer{border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.portal-footer>div{max-width:1200px;padding:22px 32px;margin:auto;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}.portal-footer nav{display:flex;flex-wrap:wrap;gap:22px}.portal-footer a{text-decoration:none}.portal-footer a:hover{color:var(--accent)}
body.works-page .portal-header h1,body.works-page .portal-header p{margin:0}body.works-page .gallery-area>.topbar{max-width:1200px;margin:auto;padding:34px 32px 20px;align-items:center;background:none;border:0}body.works-page .gallery-area h1{font-size:32px;color:var(--ink)}body.works-page .gallery-area>main{max-width:1200px;margin:auto;padding:0 32px 45px}.gallery-description{color:var(--muted);margin:8px 0 0;font-size:14px}body.works-page .work-card{border-color:var(--line)}body.works-page .portal-brand{max-width:100%}body.works-page .portal-nav{gap:5px}
@media(max-width:700px){.portal-header-inner{padding:12px 20px;gap:12px}.portal-brand{width:156px}.portal-nav{width:100%;gap:2px}.portal-nav a{padding:9px 10px;font-size:13px}.portal-main{padding:28px 20px 42px}.hero{padding-bottom:26px}h1{font-size:30px}.intro{font-size:15px}.column-grid,.steps,.example-grid{grid-template-columns:1fr}.column-card{padding:21px}.entry{align-items:flex-start;flex-direction:column;padding:22px;gap:18px}.entry h2{font-size:19px}.entry p{font-size:14px}.steps{gap:12px}.portal-footer>div{padding:20px}.portal-footer nav{gap:18px}body.works-page .gallery-area>.topbar{padding:26px 20px 18px;gap:18px}body.works-page .gallery-area>main{padding:0 20px 35px}body.works-page .gallery-area h1{font-size:28px}}
@media(prefers-reduced-motion:reduce){.column-card{transition:none}.column-card:hover{transform:none}}