:root{--primary:#176b57;--primary-dark:#104d40;--accent:#f0b64c;--ink:#20312c;--muted:#64736e;--bg:#f4f7f5;--surface:#fff;--line:#d7e1dd;--danger:#a43b35;--radius:16px;--shadow:0 12px 34px rgba(25,55,46,.08)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI","Noto Sans TC",sans-serif;line-height:1.65}a{color:var(--primary)}.site-header{display:flex;justify-content:space-between;align-items:center;padding:14px max(20px,calc((100% - 1120px)/2));background:#173f35;color:#fff}.site-header a{color:#fff;text-decoration:none;font-weight:750}.site-header nav{display:flex;gap:18px}.container{width:min(1120px,calc(100% - 32px));margin:0 auto;padding:32px 0 64px}.hero{padding:52px clamp(24px,6vw,72px);margin-bottom:30px;border-radius:24px;background:linear-gradient(130deg,#e0f3eb,#fff4d7);box-shadow:var(--shadow)}.hero.compact{padding-block:34px}.hero h1{font-size:clamp(2rem,5vw,3.6rem);line-height:1.12;margin:.2em 0}.hero.compact h1{font-size:clamp(1.8rem,4vw,2.8rem)}.eyebrow,.meta{color:var(--primary);font-weight:700;letter-spacing:.04em}.section-heading{display:flex;align-items:center;justify-content:space-between;margin-top:38px}.card-grid,.work-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}.card,.panel,.work-card,.portfolio{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.card,.panel{padding:22px}.card h3{margin:.2em 0}.button{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:10px;padding:10px 17px;background:var(--primary);color:#fff;text-decoration:none;font:inherit;font-weight:700;cursor:pointer}.button:hover{background:var(--primary-dark)}.button.secondary{background:#e5efeb;color:var(--primary-dark)}.notice{padding:14px 18px;border-radius:10px;background:#fff0c9;border:1px solid #efd58e}.notice.success{background:#e4f5ed;border-color:#a9d8c7}.notice.error{background:#fae5e3;border-color:#e7afa9;color:var(--danger)}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.form-grid label{display:grid;gap:6px;font-weight:700}.form-grid .full{grid-column:1/-1}input,textarea,select{width:100%;padding:11px 12px;border:1px solid #b8c8c2;border-radius:9px;background:#fff;color:var(--ink);font:inherit}input[type=checkbox]{width:auto}.admin-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.actions form{margin:0}.table-wrap{overflow:auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}table{width:100%;border-collapse:collapse}th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}.work-card{overflow:hidden;text-decoration:none;color:var(--ink)}.work-card img,.file-placeholder{width:100%;height:210px;object-fit:cover;background:#dce9e4;display:grid;place-items:center}.work-card strong,.work-card span{display:block;padding:5px 15px}.work-card span{padding-bottom:14px;color:var(--muted)}.portfolio{overflow:hidden}.portfolio>header,.work-copy,.details{padding:24px clamp(20px,5vw,54px)}.portfolio h1{font-size:clamp(2rem,5vw,3.5rem);line-height:1.1}.author{font-size:1.2rem}.media-stack figure{margin:0;padding:18px;background:#10231e;color:#fff;text-align:center}.media-stack img,.media-stack video{max-width:100%;max-height:75vh}.file-download{display:inline-block;padding:30px;color:#fff}.details{display:grid;gap:12px}.details div{display:grid;grid-template-columns:120px 1fr;border-top:1px solid var(--line);padding-top:10px}.details dt{font-weight:700}.tag{display:inline-block;padding:3px 9px;margin:2px;border-radius:999px;background:#e4efeb}.share-panel{margin-top:20px}.share-panel hr{margin:24px 0;border:0;border-top:1px solid var(--line)}.qr-code{width:fit-content;margin:20px auto;padding:12px;background:#fff}.warning{color:var(--danger);font-weight:700}.preline{white-space:pre-line}.history{padding-left:22px}.narrow{max-width:620px;margin:50px auto}.empty{color:var(--muted)}.site-footer{text-align:center;padding:24px;color:var(--muted)}small{display:block;color:var(--muted);font-weight:400}@media(max-width:720px){.container{width:min(100% - 20px,1120px);padding-top:18px}.site-header{padding-inline:14px}.site-header nav{gap:10px}.hero{padding:28px 20px}.form-grid,.admin-grid{grid-template-columns:1fr}.form-grid .full{grid-column:auto}.details div{grid-template-columns:1fr}.button{width:100%}.actions .button{width:auto}.section-heading{align-items:flex-end}.table-wrap{margin-inline:-10px;border-radius:0}}
/* Assignment rows and the existing upload editor. */
.assignment-list{list-style:none;padding:0;margin:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.assignment-row{padding:18px 20px;border-bottom:1px solid var(--line)}
.assignment-row:last-child{border-bottom:0}
.assignment-summary{display:flex;gap:24px;align-items:center;justify-content:space-between}
.assignment-summary h3,.assignment-summary p{margin:0}
.assignment-summary .assignment-info{min-width:0;overflow-wrap:anywhere;flex:1}
.assignment-row details{margin-top:12px}
.assignment-row summary{cursor:pointer;color:var(--primary);font-weight:700}
.assignment-row .compact-form{grid-template-columns:2fr 1fr 1fr auto;align-items:end;margin-top:14px}
.assignment-row .compact-form label{min-width:0}
.existing-file{display:grid;grid-template-columns:180px minmax(0,1fr);gap:20px;padding:18px 0;border-top:1px solid var(--line)}
.existing-preview{display:flex;align-items:center;justify-content:center;background:var(--bg);border-radius:10px}
.existing-preview img,.existing-preview video{width:100%;max-height:180px;object-fit:contain}
.existing-controls{display:grid;gap:12px;min-width:0;overflow-wrap:anywhere}
.existing-controls .remove-file{display:flex;align-items:center;gap:8px}
.existing-file.pending-remove{background:#fff1ef}
.existing-file input[type=file]{max-width:100%}
.conversion-status{margin:0}
.assignment-edit-form{margin-top:16px}
.assignment-example{margin-bottom:24px}
.assignment-example img{display:block;max-width:100%;max-height:620px;margin:14px auto 0;border-radius:12px;object-fit:contain;background:var(--bg)}
.assignment-example-editor{display:grid;grid-template-columns:minmax(160px,280px) minmax(0,1fr);gap:18px;align-items:center;padding:14px;border:1px solid var(--line);border-radius:12px}
.assignment-example-editor img{width:100%;max-height:180px;object-fit:contain;border-radius:9px;background:var(--bg)}
.assignment-example-current{display:grid;gap:8px}
.assignment-example-editor label{min-width:0}
.check-label{display:inline-flex;gap:7px;align-items:center;white-space:nowrap}
.batch-actions{margin:0 0 12px}
/* Public portfolio wall: a compact list ordered by student number. */
.public-work-head,.public-work-row{display:grid;grid-template-columns:minmax(7rem,.7fr) minmax(10rem,1fr) minmax(14rem,2fr) minmax(10rem,auto);gap:18px;align-items:center}
.public-work-head{padding:10px 18px;color:var(--muted);font-size:.9rem;font-weight:700}
.public-work-list{list-style:none;padding:0;margin:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.public-work-list li{border-bottom:1px solid var(--line)}
.public-work-list li:last-child{border-bottom:0}
.public-work-row{padding:16px 18px;color:var(--ink);text-decoration:none}
.public-work-row:hover,.public-work-row:focus-visible{background:#edf6f2}
.work-student-number{color:var(--primary);font-weight:800;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.work-author,.work-title{min-width:0;overflow-wrap:anywhere}
.work-updated{color:var(--muted);font-size:.92rem;white-space:nowrap}
@media(max-width:720px){
 .assignment-summary{align-items:flex-start;flex-wrap:wrap;gap:10px}
 .assignment-summary .assignment-info{flex-basis:100%}
 .assignment-row .compact-form{grid-template-columns:1fr}
 .existing-file{grid-template-columns:1fr}
 .existing-preview img,.existing-preview video{max-height:230px}
 .assignment-example-editor{grid-template-columns:1fr}
 .public-work-head{display:none}
 .public-work-row{grid-template-columns:minmax(6rem,.7fr) minmax(0,1.3fr);gap:5px 14px}
 .work-title,.work-updated{grid-column:1/-1}
 .work-title{margin-top:5px}
 .work-updated{white-space:normal}
}