:root{font-family:Inter,Segoe UI,system-ui,-apple-system,BlinkMacSystemFont,sans-serif;line-height:1.5;font-weight:400;color:#101828;background-color:#f5f5f5;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*,*:before,*:after{box-sizing:border-box}body{margin:0;min-height:100vh;background-color:#f5f5f5}#root{min-height:100vh}a{color:inherit;text-decoration:none}button{font-family:inherit}.app{min-height:100vh;max-width:1120px;margin:0 auto;padding:32px 24px 48px;display:flex;flex-direction:column;gap:24px}.app-header{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:16px}.app-header h1{margin:0;font-size:2rem;font-weight:700;color:#0f172a}.muted{margin:4px 0 0;color:#667085}.header-actions{display:flex;gap:12px}button{border:none;border-radius:999px;background-color:#166534;color:#fff;padding:.6rem 1.25rem;font-weight:600;font-size:1rem;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease,background-color .2s ease;display:inline-flex;align-items:center;justify-content:center;gap:.5rem}button:hover{transform:translateY(-1px);box-shadow:0 8px 16px #16653426}button:disabled{background-color:#cbd5f5;color:#64748b;cursor:not-allowed;box-shadow:none;transform:none}button.secondary{background-color:#e5e7eb;color:#1f2937;box-shadow:none}button.secondary:hover{box-shadow:none;background-color:#d1d5db}button:focus-visible{outline:3px solid rgba(59,130,246,.6);outline-offset:2px}.lock-banner,.error-banner{border-radius:12px;padding:14px 18px;font-weight:500}.lock-banner{background:#ecfdf3;color:#166534;border:1px solid #bbf7d0;display:flex;align-items:center;gap:8px}.error-banner{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}.app-body{display:flex;flex-direction:column;gap:24px;flex:1}.room-selector{background:#fff;border-radius:16px;padding:24px;box-shadow:0 20px 45px #0f172a14}.room-selector h2{margin:0 0 16px;font-size:1.25rem;color:#0f172a}.room-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}.room-card{display:flex;flex-direction:column;align-items:flex-start;gap:6px;padding:18px 20px;border-radius:14px;border:1px solid #e2e8f0;background:#f8fafc;text-align:left;transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease;cursor:pointer}.room-card:hover{border-color:#94a3b8;transform:translateY(-2px)}.room-card.selected{border-color:#16a34a;background:#ecfdf3;box-shadow:0 12px 24px #16a34a29}.room-card__title{font-size:1.1rem;font-weight:600;color:#0f172a}.room-card__time{font-size:.95rem;color:#475467}.room-card__status{font-size:.9rem;color:#166534;font-weight:500}.attendance{background:#fff;border-radius:16px;padding:28px 30px;box-shadow:0 20px 45px #0f172a14;display:flex;flex-direction:column;gap:16px}.attendance.placeholder{align-items:center;justify-content:center;min-height:240px;color:#475467;text-align:center}.attendance-header{display:flex;justify-content:space-between;align-items:baseline;gap:16px}.attendance-header h2{margin:0;font-size:1.5rem;font-weight:700;color:#0f172a}.week-chip{background:#ecfdf3;color:#166534;border-radius:999px;padding:.35rem 1rem;font-weight:600;font-size:.95rem}.attendance-instructions{margin:0;color:#475467}.attendance-list{display:grid;gap:12px}.student-row{display:grid;grid-template-columns:auto 1fr auto;gap:18px;align-items:center;padding:14px 18px;border-radius:14px;border:1px solid #e2e8f0;background:#f8fafc;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease}.student-row:hover{transform:translateY(-1px);box-shadow:0 10px 18px #0f172a14}.student-row.present{background:#ecfdf3;border-color:#86efac}.student-row.present .student-name{color:#166534}.student-row input{width:24px;height:24px;accent-color:#16a34a;cursor:pointer}.student-name{font-size:1rem;font-weight:600;color:#0f172a}.student-status{font-size:.9rem;font-weight:500;color:#475467}.student-row.present .student-status{color:#15803d}.loading{padding:60px 0;text-align:center;font-weight:600;color:#475467}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:#0f172a;color:#fff;padding:12px 20px;border-radius:999px;box-shadow:0 16px 30px #0f172a2e;font-weight:500}.modal-backdrop{position:fixed;inset:0;background:#0f172a7a;display:flex;align-items:center;justify-content:center;padding:24px;z-index:10}.modal{background:#fff;border-radius:18px;padding:28px;width:min(360px,100%);box-shadow:0 20px 45px #0f172a33}.modal h2{margin:0 0 8px;font-size:1.4rem;color:#0f172a}.modal p{margin:0 0 16px;color:#475467}.pin-input{width:100%;text-align:center;font-size:2rem;letter-spacing:.6rem;padding:14px;border-radius:12px;border:1px solid #cbd5f5;background:#f8fafc;font-weight:700;color:#0f172a}.pin-input:focus-visible{outline:3px solid rgba(59,130,246,.5)}.modal-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:20px}.error-text{color:#dc2626;font-size:.9rem;margin-top:8px}@media (min-width: 960px){.app-body{flex-direction:row;align-items:stretch}.room-selector{width:32%;min-width:280px}.attendance{flex:1}}@media (max-width: 720px){.app{padding:24px 16px 40px}.header-actions{width:100%;justify-content:space-between}.room-selector{padding:20px}.attendance{padding:22px}.student-row{grid-template-columns:auto 1fr;gap:12px}.student-status{grid-column:1 / -1}}