:root{--bg: #f4f6fb;--card: #ffffff;--text: #1f2937;--muted: #6b7280;--primary: #2563eb;--primary-hover: #1d4ed8;--error: #dc2626;--success: #059669;--border: #d1d5db;font-family:Sarabun,Segoe UI,system-ui,-apple-system,sans-serif}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--bg);color:var(--text);padding:16px}.card{background:var(--card);width:100%;max-width:420px;margin:8vh auto;padding:32px;border-radius:16px;box-shadow:0 10px 30px #00000014}h1{margin:0 0 4px;font-size:1.5rem}.subtitle{margin:0;color:var(--muted);font-size:.9rem}.card .subtitle{margin-bottom:24px}form{display:flex;flex-direction:column;gap:16px}label{display:flex;flex-direction:column;gap:6px;font-size:.9rem;font-weight:500}input{padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:1rem;font-family:inherit}input:focus{outline:2px solid var(--primary);border-color:transparent}button{padding:10px 16px;background:var(--primary);color:#fff;border:none;border-radius:8px;font-size:1rem;font-family:inherit;font-weight:600;cursor:pointer}button:hover:not(:disabled){background:var(--primary-hover)}button:disabled{opacity:.6;cursor:not-allowed}.error{color:var(--error);font-size:.9rem;margin:4px 0}.success{color:var(--success);font-size:.9rem;margin:8px 0}.muted{color:var(--muted)}.small{font-size:.82rem}.dashboard{max-width:1000px;margin:0 auto}.topbar{display:flex;justify-content:space-between;align-items:center;background:var(--card);padding:16px 24px;border-radius:14px;box-shadow:0 4px 16px #0000000d;margin-bottom:20px;gap:16px}.panels{display:grid;grid-template-columns:1fr 1fr;gap:20px}.panel{background:var(--card);padding:20px 24px;border-radius:14px;box-shadow:0 4px 16px #0000000d}.panel h2{margin:0 0 16px;font-size:1.15rem}.panel.wide{grid-column:1 / -1}select{padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:1rem;font-family:inherit;background:#fff}.exam-form{display:flex;flex-direction:row;flex-wrap:wrap;gap:10px;align-items:center}.link-btn{background:transparent;color:var(--primary);padding:4px 8px;font-weight:600}.link-btn:hover:not(:disabled){background:#eef2ff}.link-btn.danger{color:var(--error)}.link-btn.danger:hover:not(:disabled){background:#fee2e2}.row-actions{white-space:nowrap;display:flex;gap:4px}.add-student{margin-top:16px;padding-top:16px;border-top:1px solid #eef0f4}.scan-card{border:1px solid var(--border);border-radius:12px;padding:14px;margin-top:14px}.scan-head{margin-bottom:10px}.scan-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:6px 18px}.scan-item{display:flex;align-items:center;gap:6px;padding:3px 6px;border-radius:6px}.scan-item.review{background:#fef2f2}.choice-btn{padding:4px 9px;background:#f1f5f9;color:var(--text);border:1px solid var(--border);border-radius:6px;font-weight:400}.choice-btn.on{background:var(--primary);color:#fff;border-color:var(--primary)}.stat-tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:10px;margin-bottom:18px}.stat-tile{background:#f8fafc;border:1px solid var(--border);border-radius:10px;padding:12px;text-align:center}.stat-value{font-size:1.4rem;font-weight:700;color:var(--primary)}.stat-label{font-size:.8rem;color:var(--muted);margin-top:2px}.report-h3{margin:18px 0 8px;font-size:1rem}.chart{margin:0 0 8px;max-width:560px}.key-editor{margin-top:20px;padding:16px;border:1px solid var(--border);border-radius:12px;background:#fbfcfe}.key-editor-head{display:flex;justify-content:space-between;align-items:center}.key-editor-head h3{margin:0}.key-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:8px 20px;margin:14px 0}.key-row{display:flex;align-items:center;gap:10px;padding:4px 0}.key-row.voided .key-choice{opacity:.4}.key-no{width:28px;text-align:right;color:var(--muted);font-variant-numeric:tabular-nums}.key-choice,.key-void{display:inline-flex;align-items:center;gap:4px;font-size:.9rem;font-weight:400}.key-void{margin-left:auto;color:var(--muted);font-size:.8rem}.inline-form{display:flex;flex-direction:row;gap:10px;align-items:flex-end;flex-wrap:wrap}.inline-form input[type=text],.inline-form>input:not([type]){flex:1;min-width:160px}.year-label{flex-direction:column;font-size:.85rem}.chip-list{list-style:none;padding:0;margin:16px 0 0;display:flex;flex-wrap:wrap;gap:8px}.chip{display:inline-flex;align-items:center;gap:8px;background:#eef2ff;color:#3730a3;padding:6px 10px;border-radius:999px;font-size:.9rem}.chip-del{background:transparent;color:#6366f1;border:none;padding:0;font-size:1.1rem;line-height:1;cursor:pointer;font-weight:700}.chip-del:hover{color:var(--error);background:transparent}.preview{margin:12px 0;padding:12px 16px;background:#f9fafb;border:1px solid var(--border);border-radius:10px}.data-table{width:100%;border-collapse:collapse;margin-top:16px;font-size:.92rem}.data-table th,.data-table td{text-align:left;padding:8px 10px;border-bottom:1px solid #eef0f4}.data-table th{color:var(--muted);font-weight:600}@media (max-width: 720px){.panels{grid-template-columns:1fr}}