:root{--navy:#0b2b3a;--teal:#0e6e6b;--mint:#e6f2f1;--ink:#1e2933;--muted:#5b6b76;--line:#dfe7ea;--bg:#f5f8f9;--amber:#b7791f}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:Segoe UI,system-ui,-apple-system,Arial,sans-serif}.page{max-width:1040px;margin:0 auto;padding:48px 24px 72px}.kicker{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--teal);font-weight:800}h1{font-size:38px;letter-spacing:-.02em;color:var(--navy);margin:8px 0 6px}.lead{color:var(--muted);font-size:15px;max-width:640px;line-height:1.5}.badge{display:inline-block;background:var(--mint);color:var(--teal);border-radius:999px;padding:4px 12px;font-size:12px;font-weight:700}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin-top:28px}.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.card h2{font-size:14px;margin:0 0 6px;color:var(--navy)}.card p{font-size:13px;color:var(--muted);margin:0;line-height:1.45}.status{display:inline-block;font-size:11px;font-weight:700;padding:2px 8px;border-radius:999px;margin-bottom:8px}.done{background:#e7f4ec;color:#2f7d4f}.todo{background:#fdf3e3;color:var(--amber)}.footer{margin-top:36px;padding-top:16px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}.footer code{background:#fff;border:1px solid var(--line);border-radius:6px;padding:1px 6px}.auth-page{max-width:560px}.auth-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px;margin-top:24px;gap:14px}.auth-card,.field{display:flex;flex-direction:column}.field{gap:6px;font-size:13px;color:var(--muted)}.input{border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:14px;color:var(--ink);background:#fff}.input:focus{outline:2px solid var(--mint);border-color:var(--teal)}.btn{background:var(--teal);color:#fff;border:0;border-radius:8px;padding:11px 16px;font-size:14px;font-weight:700;cursor:pointer}.btn.secondary{background:#fff;color:var(--navy);border:1px solid var(--line)}.error{color:#a32c2c;background:#fdecec;border-radius:8px;padding:8px 10px;font-size:12.5px;margin:0}.tiny{font-size:11.5px;color:var(--muted);margin:0}.account-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px 20px;margin:24px 0;max-width:560px}.account-row{display:flex;justify-content:space-between;gap:16px;padding:12px 0;border-bottom:1px solid var(--line);font-size:14px}.account-row:last-child{border-bottom:0}.account-row span{color:var(--muted)}.wide{max-width:1180px}.page-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:18px;flex-wrap:wrap}.stats-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:18px 0}.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px;display:flex;flex-direction:column;gap:4px}.stat span{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.stat strong{font-size:24px;color:var(--navy)}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}.panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.panel h2{font-size:15px;margin:0 0 10px;color:var(--navy)}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.span-2{grid-column:span 2}.table{width:100%;border-collapse:collapse;font-size:13px}.table th{text-align:left;font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);padding:8px 10px}.table td,.table th{border-bottom:1px solid var(--line)}.table td{padding:10px;vertical-align:middle}.table tr:last-child td{border-bottom:0}.success{background:#e7f4ec;color:#2f7d4f;border-radius:8px;padding:8px 10px;font-size:12.5px}.tiny-btn{padding:5px 9px;font-size:11px;border-radius:6px}.filters{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.filters .input{width:auto;min-width:120px}.group-list{display:flex;flex-direction:column;gap:8px}.group-card{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px;border:1px solid var(--line);border-radius:10px;text-decoration:none;color:var(--ink)}.group-card:hover{border-color:var(--teal);background:#f7fbfa}.group-card span{display:block}.board{display:grid;grid-template-columns:1fr 1fr;gap:16px}.dropzone{min-height:280px;border-style:dashed;transition:border-color .15s,background .15s}.dropzone.over{border-color:var(--teal);background:#f3faf9}.student-list{display:flex;flex-direction:column;gap:8px;margin-top:10px}.student-chip{display:flex;justify-content:space-between;align-items:center;gap:10px;border:1px solid var(--line);border-radius:9px;padding:9px 11px;background:#fff;cursor:grab}.student-chip:active{cursor:grabbing}.student-chip strong{display:block;font-size:13px}.student-chip span{font-size:11px;color:var(--muted)}.muted{color:var(--muted)}@media (max-width:860px){.board,.form-grid,.grid-2{grid-template-columns:1fr}.span-2{grid-column:auto}.stats-row{grid-template-columns:1fr 1fr}}