:root{--bg: #f0f2f5;--surface: #ffffff;--primary: #1a56db;--primary-hover: #1342a8;--primary-light: #e8effc;--danger: #c81e1e;--danger-hover: #9b1c1c;--success: #0e9f47;--text: #111827;--text-secondary: #374151;--text-muted: #6b7280;--border: #d1d5db;--border-light: #e5e7eb;--radius: 10px;--radius-sm: 6px;--shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .07), 0 2px 4px -2px rgba(0, 0, 0, .05);--shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, .1), 0 8px 10px -6px rgba(0, 0, 0, .05);--transition: .2s ease}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app{max-width:920px;margin:0 auto;padding:32px 20px 48px}.app-header{text-align:center;margin-bottom:36px;padding:32px 24px 38px;background:var(--surface);border-radius:var(--radius);color:var(--text);box-shadow:var(--shadow-md);border:2px solid var(--primary)}.app-header h1{font-size:2rem;font-weight:700;color:var(--text);letter-spacing:-.02em}.app-header p{color:var(--text-muted);margin-top:8px;font-size:.95rem;max-width:600px;margin-left:auto;margin-right:auto;line-height:1.7}.card{background:var(--surface);border:1px solid var(--border-light);border-radius:var(--radius);padding:28px;margin-bottom:24px;box-shadow:var(--shadow);transition:box-shadow var(--transition)}.card:hover{box-shadow:var(--shadow-md)}.card h2{font-size:1.1rem;font-weight:600;margin-bottom:16px;display:flex;align-items:center;gap:8px;color:var(--text);letter-spacing:-.01em}.card h3{font-size:.95rem;font-weight:600;margin-bottom:10px;color:var(--text-secondary)}.form-row{display:flex;gap:14px;margin-bottom:14px;flex-wrap:wrap}.form-group{display:flex;flex-direction:column;flex:1;min-width:200px}.form-group label{font-size:.75rem;font-weight:600;color:var(--text-muted);margin-bottom:5px;text-transform:uppercase;letter-spacing:.05em}.form-group input,.form-group textarea{padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.9rem;font-family:inherit;color:var(--text);background:var(--surface);transition:border-color var(--transition),box-shadow var(--transition)}.form-group input:focus,.form-group textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #1a56db1f}.form-group input::placeholder,.form-group textarea::placeholder{color:#9ca3af}.form-group input:disabled,.form-group textarea:disabled{background:#f3f4f6;color:var(--text-muted);cursor:not-allowed}.form-group textarea{resize:vertical;min-height:60px}.checkbox-row{display:flex;gap:20px;margin-bottom:12px;flex-wrap:wrap}.checkbox-row-vertical{flex-direction:column;gap:10px;align-items:flex-start}.checkbox-label{display:flex;align-items:center;gap:8px;font-size:.9rem;cursor:pointer;color:var(--text-secondary)}.checkbox-label input[type=checkbox]{width:16px;height:16px;accent-color:var(--primary)}.help-link{display:inline-block;margin-bottom:10px;padding:0;border:none;background:transparent;color:var(--primary);text-decoration:underline;text-underline-offset:2px;font-size:.9rem;cursor:pointer;transition:color var(--transition)}.help-link:hover{color:var(--primary-hover)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 18px;border:none;border-radius:var(--radius-sm);font-size:.875rem;font-weight:500;font-family:inherit;cursor:pointer;transition:background var(--transition),box-shadow var(--transition),transform .1s ease;white-space:nowrap}.btn:active:not(:disabled){transform:scale(.97)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 1px 2px #1a56db33}.btn-primary:hover:not(:disabled){background:var(--primary-hover);box-shadow:0 2px 4px #1a56db4d}.btn-danger{background:var(--danger);color:#fff;box-shadow:0 1px 2px #c81e1e33}.btn-danger:hover:not(:disabled){background:var(--danger-hover);box-shadow:0 2px 4px #c81e1e4d}.btn-outline{background:transparent;color:var(--primary);border:1px solid var(--border)}.btn-outline:hover:not(:disabled){background:var(--primary-light);border-color:var(--primary)}.btn-sm{padding:5px 12px;font-size:.8rem}.btn-group{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap}.status{margin-top:14px;padding:10px 14px;border-radius:var(--radius-sm);font-size:.875rem;font-weight:500}.status-error{background:#fef2f2;color:var(--danger);border:1px solid #fecaca}.status-success{background:#f0fdf4;color:var(--success);border:1px solid #bbf7d0}.student-list{display:flex;flex-direction:column;gap:12px}.student-item{border:1px solid var(--border-light);border-radius:var(--radius);padding:18px;background:#fafbfd;transition:box-shadow var(--transition),border-color var(--transition)}.student-item:hover{box-shadow:var(--shadow);border-color:var(--border)}.student-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.student-name{font-weight:600;color:var(--text)}.student-meta{display:flex;gap:16px;font-size:.85rem;color:var(--text-muted);flex-wrap:wrap}.tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:99px;font-size:.75rem;font-weight:500;letter-spacing:.01em}.tag-on{background:var(--primary-light);color:var(--primary)}.tag-off{background:#f3f4f6;color:var(--text-muted)}.divider{border:none;border-top:1px solid var(--border-light);margin:16px 0}.tabs{display:flex;gap:0;border-bottom:2px solid var(--border-light);margin-bottom:24px}.tab{padding:11px 22px;border:none;background:none;font-size:.9rem;font-weight:500;font-family:inherit;color:var(--text-muted);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-2px;transition:color var(--transition),border-color var(--transition)}.tab:hover{color:var(--text-secondary)}.tab.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.parent-info{display:grid;grid-template-columns:180px 1fr;gap:8px 16px;font-size:.9rem}.parent-info dt{color:var(--text-muted);font-weight:500}.parent-info dd{font-weight:400;color:var(--text-secondary)}.confirm-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:100}.confirm-dialog{background:var(--surface);padding:28px;border-radius:var(--radius);box-shadow:var(--shadow-lg);max-width:420px;width:90%}.confirm-dialog p{margin-bottom:18px;line-height:1.6;color:var(--text-secondary)}.student-help-dialog{max-width:min(90vw,960px)}.student-help-image{display:block;width:100%;height:auto;border-radius:var(--radius)}.spinner{display:inline-block;width:14px;height:14px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:600px){.app{padding:16px 12px 32px}.app-header{padding:24px 16px 20px}.app-header h1{font-size:1.5rem}.card{padding:20px}.form-row{flex-direction:column}.form-group{min-width:100%}.section-header{flex-direction:column;align-items:flex-start;gap:10px}}.landing-features{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:14px}.landing-feature{padding:20px;background:var(--bg);border-radius:var(--radius);border:1px solid var(--border-light);transition:box-shadow var(--transition),border-color var(--transition)}.landing-feature:hover{box-shadow:var(--shadow);border-color:var(--border)}.landing-feature h3{font-size:.9rem;margin-bottom:6px;color:var(--text)}.landing-feature p{font-size:.84rem;color:var(--text-muted);line-height:1.6}@media(max-width:700px){.landing-features{grid-template-columns:1fr}}.schedule-table{width:100%;border-collapse:collapse;font-size:.9rem}.schedule-table th,.schedule-table td{text-align:left;padding:11px 16px;border-bottom:1px solid var(--border-light)}.schedule-table th{font-weight:600;color:var(--text-muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;background:var(--bg)}.schedule-table tbody tr:last-child td{border-bottom:none}.schedule-table tbody tr:hover{background:#f9fafb}