.preview-gate{--pg-bg: #f6f6f8;--pg-surface: #ffffff;--pg-text: #1e293b;--pg-text-secondary: #64748b;--pg-border: #e2e8f0;--pg-primary: #135bec;--pg-red: #b3261e;display:flex;align-items:center;justify-content:center;min-height:100dvh;background:var(--pg-bg);padding:24px}@media(prefers-color-scheme:dark){.preview-gate{--pg-bg: #121218;--pg-surface: #1e1e26;--pg-text: #e2e8f0;--pg-text-secondary: #94a3b8;--pg-border: #334155;--pg-primary: #7babff}}.preview-gate-form{display:flex;flex-direction:column;align-items:center;gap:12px;width:100%;max-width:320px;padding:32px;background:var(--pg-surface);border:1px solid var(--pg-border);border-radius:16px;line-height:1.5}.preview-gate-title{font-size:1.5rem;font-weight:700;color:var(--pg-text);margin:0}.preview-gate-desc{font-size:.9rem;color:var(--pg-text-secondary);text-align:center}.preview-gate-input{width:100%;padding:10px 14px;font-size:1rem;line-height:1.5;border:1px solid var(--pg-border);border-radius:8px;background:var(--pg-bg);color:var(--pg-text);outline:none;transition:border-color .15s}.preview-gate-input:focus{border-color:var(--pg-primary)}.preview-gate-input-error{border-color:var(--pg-red)}.preview-gate-error{font-size:.85rem;color:var(--pg-red)}.preview-gate-button{width:100%;padding:10px;font-size:1rem;font-weight:600;line-height:1.5;color:#fff;background:var(--pg-primary);border:none;border-radius:8px;cursor:pointer;transition:opacity .15s}.preview-gate-button:hover{opacity:.9}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%;color-scheme:light dark}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5;min-height:100dvh;-webkit-font-smoothing:antialiased}#root{min-height:100dvh;display:flex;flex-direction:column}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;background:none;font:inherit;color:inherit}input,textarea,select{font:inherit}ul{list-style:none}img{max-width:100%}:root{--bg: #fafafa;--surface: #ffffff;--text: #1a1a1a;--text-secondary: #666666;--border: #e0e0e0;--primary: #6750a4;--primary-light: #e8def8;--green: #4caf50;--yellow: #ff9800;--red: #f44336;--green-bg: #e8f5e9;--green-text: #2e7d32;--yellow-bg: #fff3e0;--yellow-text: #e65100;--red-bg: #ffebee;--red-text: #c62828;--yellow-border: #ffcc80;--red-border: #ef9a9a;--overlay: rgba(0, 0, 0, .5)}@media(prefers-color-scheme:dark){:root{--bg: #121215;--surface: #1e1e24;--text: #e0e0e0;--text-secondary: #999999;--border: #333340;--primary: #b39ddb;--primary-light: rgba(179, 157, 219, .15);--green: #66bb6a;--yellow: #ffb74d;--red: #ef5350;--green-bg: rgba(102, 187, 106, .15);--green-text: #66bb6a;--yellow-bg: rgba(255, 183, 77, .15);--yellow-text: #ffb74d;--red-bg: rgba(239, 83, 80, .15);--red-text: #ef5350;--yellow-border: rgba(255, 183, 77, .4);--red-border: rgba(239, 83, 80, .4);--overlay: rgba(0, 0, 0, .6)}}body{background:var(--bg);color:var(--text)}.container{max-width:1200px;margin:0 auto;padding:24px}.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:20px;margin-bottom:16px}.card-clickable{cursor:pointer;transition:box-shadow .2s}.card-clickable:hover{box-shadow:0 2px 8px #0000001a}.container h1{font-size:28px;margin-bottom:24px}.container h2{font-size:22px;margin-bottom:16px}.container h3{font-size:18px;margin-bottom:12px}.header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;padding-bottom:16px;border-bottom:1px solid var(--border)}.back-link{color:var(--primary);text-decoration:none;font-weight:500}.back-link:hover{text-decoration:underline}.btn{display:inline-block;padding:10px 24px;border:none;border-radius:20px;font-size:14px;font-weight:500;cursor:pointer;transition:opacity .2s}.btn:hover{opacity:.9}.btn-primary{background:var(--primary);color:#fff}.btn-outline{background:transparent;color:var(--primary);border:1px solid var(--primary)}.stat-row{display:flex;justify-content:space-between;align-items:center;padding:8px 0}.stat-label{color:var(--text-secondary);font-size:14px}.stat-value{font-weight:600}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.badge{display:inline-block;padding:2px 10px;border-radius:12px;font-size:12px;font-weight:500}.badge-green{background:var(--green-bg);color:var(--green-text)}.badge-yellow{background:var(--yellow-bg);color:var(--yellow-text)}.badge-red{background:var(--red-bg);color:var(--red-text)}.empty-state{text-align:center;padding:48px 24px;color:var(--text-secondary)}.loading{text-align:center;padding:48px;color:var(--text-secondary)}.session-group-header{font-size:14px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;margin-top:24px;margin-bottom:8px}.session-row{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid var(--border);cursor:pointer}.session-row:hover{background:var(--bg)}.attempt-row{display:grid;grid-template-columns:1fr 1fr 1fr 100px;gap:8px;padding:10px 0;border-bottom:1px solid var(--border);font-size:14px}.attempt-header{font-weight:600;color:var(--text-secondary)}.btn-small{padding:6px 14px;font-size:13px}.btn-danger{background:var(--red);color:#fff}.btn:disabled{opacity:.5;cursor:not-allowed}.card-header-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.card-header-row h1,.card-header-row h2{margin-bottom:0}.inline-form{display:flex;gap:8px;align-items:center}.form-field{margin-bottom:16px}.form-field label{display:block;font-size:14px;font-weight:500;margin-bottom:4px;color:var(--text-secondary)}.container input[type=text]{padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px;background:var(--surface);color:var(--text)}.container input[type=text]:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-light)}.pin-field{display:flex;gap:8px;align-items:center}.pin-field input{width:80px;font-family:monospace;font-size:18px;text-align:center;letter-spacing:4px}.form-fieldset{border:1px solid var(--border);border-radius:8px;padding:16px;margin-bottom:16px}.form-fieldset legend{font-size:14px;font-weight:500;color:var(--text-secondary);padding:0 6px}.toggle-label{display:flex;align-items:center;gap:8px;padding:6px 0;font-size:14px;cursor:pointer}.toggle-label input[type=checkbox]{width:18px;height:18px;accent-color:var(--primary)}.form-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:16px}.form-card{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:16px;margin:12px 0}.text-secondary{color:var(--text-secondary);font-size:14px}.student-row{border-bottom:1px solid var(--border);padding:12px 0}.student-row:last-child{border-bottom:none}.student-row-content{display:flex;align-items:center;justify-content:space-between}.student-info{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.student-name{font-weight:500}.student-badges{display:flex;gap:4px}.badge-sen{background:var(--primary-light);color:var(--primary)}.student-actions{display:flex;gap:6px}.student-form{max-width:400px}.bulk-textarea{width:100%;padding:12px;border:1px solid var(--border);border-radius:8px;font-size:14px;font-family:inherit;resize:vertical}.bulk-textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-light)}.pin-sheet-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:var(--overlay);display:flex;align-items:center;justify-content:center;z-index:100}.pin-sheet{background:var(--surface);border-radius:12px;padding:24px;max-width:500px;width:90%;max-height:80vh;overflow-y:auto}.pin-sheet-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.pin-sheet-header h2{margin-bottom:0}.pin-sheet-title{text-align:center;margin-bottom:16px}.pin-table{width:100%;border-collapse:collapse}.pin-table th,.pin-table td{padding:10px 16px;border-bottom:1px solid var(--border);text-align:left}.pin-table th{font-size:13px;color:var(--text-secondary);font-weight:600}.pin-value{font-family:monospace;font-size:18px;letter-spacing:4px;font-weight:600}.error-banner{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-radius:8px;margin-bottom:16px;font-size:14px;font-weight:500}.error-banner-quota{background:var(--yellow-bg);color:var(--yellow-text);border:1px solid var(--yellow-border)}.error-banner-generic{background:var(--red-bg);color:var(--red-text);border:1px solid var(--red-border)}.error-banner-dismiss{background:none;border:none;color:inherit;font-weight:600;cursor:pointer;padding:4px 8px;border-radius:4px;font-size:13px;flex-shrink:0;margin-left:12px}.error-banner-dismiss:hover{opacity:.7}@media print{body *{visibility:hidden}.pin-sheet-content,.pin-sheet-content *{visibility:visible}.pin-sheet-content{position:absolute;left:0;top:0;width:100%}.pin-sheet-overlay{position:static;background:none}.pin-sheet{box-shadow:none;border-radius:0;max-height:none;max-width:none;width:100%}.no-print{display:none!important}.pin-table th,.pin-table td{border-bottom:1px solid #000}.pin-value{font-size:20px}}