:root{--ink:#17233c;--muted:#64748b;--line:#dce3ec;--surface:#fff;--bg:#f5f7fb;--brand:#2456d6;--brand-dark:#183e9f;--danger:#b42318;--radius:14px;--shadow:0 10px 30px rgba(23,35,60,.08)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 system-ui,-apple-system,"Segoe UI",sans-serif}.site-header{height:68px;padding:0 max(24px,calc((100% - 1180px)/2));background:#102045;color:#fff;display:flex;align-items:center;justify-content:space-between}.brand{color:#fff;font-size:19px;font-weight:750;text-decoration:none}.site-header nav{display:flex;gap:22px;align-items:center}.site-header nav a,.link-button{color:#dbe5ff;text-decoration:none}.inline{display:inline}.link-button,.text-action{border:0;background:none;font:inherit;cursor:pointer;padding:0}.container{max-width:1180px;margin:0 auto;padding:40px 24px 72px}footer{text-align:center;color:var(--muted);padding:24px}.page-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;margin:12px 0 30px}.page-heading h1{font-size:clamp(28px,4vw,42px);margin:0 0 5px;letter-spacing:-.03em}.eyebrow{text-transform:uppercase;letter-spacing:.12em;color:var(--brand);font-weight:750;font-size:12px;margin:0 0 7px}h2{margin-top:28px}h3{font-size:14px;color:var(--muted);margin-top:24px}.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:9px;padding:9px 15px;background:#fff;color:var(--ink);font-weight:650;text-decoration:none;cursor:pointer}.button.primary{background:var(--brand);border-color:var(--brand);color:#fff}.button.primary:hover{background:var(--brand-dark)}.button.danger{color:var(--danger);padding:6px 11px}.back{display:inline-block;margin-bottom:12px;color:var(--muted);text-decoration:none}.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,420px),1fr));gap:22px}.card,.form-card,.selection-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:25px;box-shadow:var(--shadow)}.card-head,.section-head{display:flex;align-items:center;justify-content:space-between;gap:15px}.card h2{margin:0}.card-head p{color:var(--muted);margin:4px 0}.badge,.status{background:#e9efff;color:#254da8;border-radius:999px;padding:5px 10px;font-size:12px;font-weight:700}.sheet-list{list-style:none;margin:0;padding:0}.sheet-list li{display:flex;justify-content:space-between;align-items:center;padding:13px 0;border-top:1px solid var(--line)}.empty{max-width:600px;margin:60px auto;text-align:center;background:#fff;padding:50px 30px;border-radius:var(--radius);border:1px solid var(--line)}.empty-icon{font-size:50px;color:var(--brand)}.result-table-wrapper,.table-wrapper{width:100%;overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow)}table{width:100%;border-collapse:separate;border-spacing:0}th,td{text-align:left;padding:12px 14px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);white-space:nowrap}th{background:#edf2fa;font-weight:750;position:sticky;top:0;z-index:1}.bold{font-weight:750}.align-center{text-align:center}.align-right{text-align:right}.pagination{display:flex;align-items:center;justify-content:center;gap:16px;margin-top:24px}.auth-card,.form-card{max-width:620px;margin:30px auto}.auth-card{background:#fff;padding:35px;border-radius:var(--radius);box-shadow:var(--shadow)}label{font-weight:650;display:block;margin:15px 0 6px}input[type=text],input[type=password],input[type=file],textarea,select{width:100%;padding:11px;border:1px solid #bdc8d8;border-radius:8px;background:#fff;font:inherit}.auth-card .button{width:100%;margin-top:22px}.alert{padding:13px 16px;border-radius:9px;margin-bottom:18px;background:#e8f6ec;color:#176b38}.alert.error,.field-error{background:#fff0ee;color:#a32218}.field-error{display:block;padding:5px;margin-top:4px}.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.metrics article{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px}.metrics strong{display:block;font-size:32px}.metrics span,small{color:var(--muted)}.search{display:flex;gap:10px;max-width:560px;margin-bottom:20px}.details{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.details div{background:#fff;border:1px solid var(--line);padding:15px;border-radius:10px}.details dt{color:var(--muted);font-size:12px;text-transform:uppercase}.details dd{margin:4px 0 0}.actions{display:flex;gap:10px}.assignment-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.assignment-grid ul{list-style:none;padding:0;max-height:330px;overflow:auto}.assignment-grid li label{font-weight:400}.assignment-submit{grid-column:1/-1}.text-action{color:var(--brand)}.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}@media(max-width:700px){.container{padding:26px 15px 55px}.site-header{padding:0 15px}.page-heading{flex-direction:column}.metrics,.details,.assignment-grid{grid-template-columns:1fr}.assignment-submit{grid-column:auto}.actions{flex-wrap:wrap}.result-table-wrapper{margin-left:-15px;width:calc(100% + 30px);border-radius:0}.card{padding:20px}.site-header nav a{display:none}}