:root{--bg:#0f172a;--card:#1e293b;--text:#f1f5f9;--muted:#94a3b8;--accent:#f97316;--ok:#22c55e;--err:#ef4444;--border:#334155}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}main{min-height:100dvh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px}.card{width:100%;max-width:420px;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:28px}h1{font-size:1.5rem;margin:0 0 4px}.sub{font-size:.95rem;margin:0 0 20px}.sub,label{color:var(--muted)}label{display:block;font-size:.85rem;margin-bottom:6px}input{width:100%;padding:14px;font-size:1.1rem;border-radius:10px;border:1px solid var(--border);background:#0b1220;color:var(--text);margin-bottom:16px}input:focus{outline:2px solid var(--accent);border-color:transparent}button{width:100%;padding:14px;font-size:1.05rem;font-weight:600;border-radius:10px;border:none;background:var(--accent);color:#1a1005;cursor:pointer}button:disabled{opacity:.6;cursor:not-allowed}.msg{margin-top:16px;padding:12px 14px;border-radius:10px;font-size:.95rem}.msg.ok{background:rgba(34,197,94,.12);border:1px solid var(--ok)}.msg.err{background:rgba(239,68,68,.12);border:1px solid var(--err)}.big-check{font-size:3rem;text-align:center;margin-bottom:8px}.qr-wrap{background:#fff;padding:20px;border-radius:16px;display:inline-block;max-width:100%}.qr-wrap svg{display:block;width:260px;max-width:100%;height:auto}.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--muted);font-size:.85rem;word-break:break-all}@media print{body,html{background:#fff;color:#000}.no-print{display:none}}main.admin{display:block;min-height:100dvh;padding:24px 16px 64px}.admin-wrap{max-width:900px;margin:0 auto}.admin-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:24px}.admin-head h1{margin:0}.btn-link,button.ghost{display:inline-block;padding:10px 14px;font-size:.9rem;font-weight:600;border-radius:8px;border:1px solid var(--border);background:transparent;color:var(--text);cursor:pointer;text-decoration:none;width:auto}.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:24px}.toolbar input[type=date]{width:auto;margin:0;padding:9px 12px;font-size:.95rem}.toolbar button{width:auto;padding:10px 16px;font-size:.95rem}.stats{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:8px}.stat{flex:1 1 120px;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px;text-align:center}.stat.ok{border-color:var(--ok)}.stat.err{border-color:var(--err)}.stat-value{font-size:1.8rem;font-weight:700}.stat-label{color:var(--muted);font-size:.8rem;text-transform:uppercase;letter-spacing:.04em}.admin-section{margin-top:28px}.admin-section h2{font-size:1.05rem;margin:0 0 10px}.table-scroll{overflow-x:auto;border:1px solid var(--border);border-radius:12px}table{width:100%;border-collapse:collapse;font-size:.92rem}td,th{text-align:left;padding:10px 14px;border-bottom:1px solid var(--border);white-space:nowrap}th{color:var(--muted);font-weight:600;font-size:.8rem;text-transform:uppercase;letter-spacing:.03em}tbody tr:last-child td{border-bottom:none}.cal{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px;margin-bottom:24px}.cal-head{display:flex;align-items:center;justify-content:space-between;font-weight:600;margin-bottom:12px}.cal-nav{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:8px;border:1px solid var(--border);color:var(--text);text-decoration:none;font-size:1.1rem}.cal-grid{display:grid;grid-template-columns:repeat(7,1fr);grid-gap:6px;gap:6px}.cal-dow{text-align:center;color:var(--muted);font-size:.72rem;font-weight:700;text-transform:uppercase;padding-bottom:4px}.cal-cell{position:relative;aspect-ratio:1/1;display:flex;align-items:center;justify-content:center;border-radius:8px;border:1px solid transparent;background:#0b1220;color:var(--text);text-decoration:none;font-size:.95rem}.cal-cell.empty{background:transparent}.cal-cell.class-day{background:rgba(249,115,22,.16);border-color:rgba(249,115,22,.5);font-weight:700}.cal-cell.today{outline:2px solid var(--muted);outline-offset:-2px}.cal-cell.selected{border-color:var(--accent);outline:2px solid var(--accent);outline-offset:-2px}.cal-n{position:absolute;top:2px;right:4px;font-size:.62rem;font-weight:700;color:var(--ok)}.cal-legend{color:var(--muted);font-size:.78rem;margin:12px 0 0;display:flex;align-items:center;gap:6px;flex-wrap:wrap}.swatch{display:inline-block;width:12px;height:12px;border-radius:3px;background:rgba(249,115,22,.16);border:1px solid rgba(249,115,22,.5)}.day-head{justify-content:space-between;gap:12px;margin-bottom:16px}.day-head,.day-head h2{display:flex;flex-wrap:wrap;align-items:center}.day-head h2{margin:0;font-size:1.15rem;gap:8px}.day-actions{display:flex;gap:8px;flex-wrap:wrap}.pill{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.03em;padding:3px 8px;border-radius:999px;background:var(--border);color:var(--text)}.pill.warn{background:rgba(239,68,68,.15);color:var(--err)}