:root{--color-primary: #4338ca;--color-primary-dark: #3730a3;--color-primary-soft: #eef2ff;--color-accent: #0ea5e9;--color-accent-soft: #e0f2fe;--color-success: #059669;--color-danger: #dc2626;--color-bg: #f4f6f9;--color-surface: #ffffff;--color-surface-raised: #ffffff;--color-border: #e2e8f0;--color-border-strong: #cbd5e1;--color-text: #0f172a;--color-text-muted: #64748b;--font-display: "Fraunces", Georgia, serif;--font-family: "DM Sans", system-ui, sans-serif;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--shadow-sm: 0 1px 2px rgba(15, 23, 42, .04);--shadow-md: 0 8px 24px rgba(15, 23, 42, .06);--shadow-lg: 0 20px 48px rgba(15, 23, 42, .08);--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 24px;--space-6: 32px;--space-7: 48px;--space-8: 64px;--nav-height: 56px;--sidebar-width: 260px;--transition: .18s ease}[data-theme=dark]{--color-primary: #818cf8;--color-primary-dark: #6366f1;--color-primary-soft: #1e1b4b;--color-accent: #38bdf8;--color-accent-soft: #0c4a6e;--color-success: #34d399;--color-danger: #f87171;--color-bg: #0b0f17;--color-surface: #141b27;--color-surface-raised: #1a2332;--color-border: #2a3548;--color-border-strong: #3d4d66;--color-text: #f1f5f9;--color-text-muted: #94a3b8;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .35);--shadow-md: 0 8px 24px rgba(0, 0, 0, .45);--shadow-lg: 0 20px 48px rgba(0, 0, 0, .55)}[data-theme=dark] .badge-normal{background:var(--color-primary-soft);color:var(--color-primary)}[data-theme=dark] .badge-urgent{background:#450a0a;color:#fca5a5}[data-theme=dark] .badge-due{background:#451a03;color:#fcd34d}[data-theme=dark] .alert-error{background:#450a0a;border-color:#7f1d1d}[data-theme=dark] .stat-card.highlight,[data-theme=dark] .student-stats .highlight{background:color-mix(in srgb,var(--color-primary) 14%,var(--color-surface))!important;border-color:color-mix(in srgb,var(--color-primary) 35%,var(--color-border))}*,*:before,*:after{box-sizing:border-box}html,body{height:100%;margin:0;font-family:var(--font-family);background:var(--color-bg);color:var(--color-text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:var(--color-primary);text-decoration:none}button,input,select,textarea{font-family:inherit}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:11px 18px;border:none;border-radius:var(--radius-md);font-weight:600;font-size:14px;cursor:pointer;transition:background var(--transition),transform var(--transition),box-shadow var(--transition)}.btn:active:not(:disabled){transform:translateY(1px)}.btn-primary{background:var(--color-primary);color:#fff;box-shadow:0 1px #ffffff1f inset}.btn-primary:hover:not(:disabled){background:var(--color-primary-dark)}.btn-primary:disabled{opacity:.65;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--color-text);border:1px solid var(--color-border)}.btn-ghost:hover{background:var(--color-bg);border-color:var(--color-border-strong)}.btn-sm{padding:6px 12px;font-size:13px}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:var(--space-5)}.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:var(--space-4)}.stat-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-4);transition:border-color var(--transition)}.stat-card:hover{border-color:var(--color-border-strong)}.stat-card .label{font-size:12px;font-weight:600;letter-spacing:.03em;text-transform:uppercase;color:var(--color-text-muted);margin-bottom:var(--space-2)}.stat-card .value{font-family:var(--font-display);font-size:32px;font-weight:600;line-height:1;letter-spacing:-.02em}.form-group{margin-bottom:var(--space-4)}.form-group label{display:block;font-size:13px;font-weight:600;margin-bottom:var(--space-2);color:var(--color-text)}.form-group input,.form-group select,.form-group textarea{width:100%;padding:12px 14px;border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:15px;background:var(--color-surface);color:var(--color-text);transition:border-color var(--transition),box-shadow var(--transition)}.form-group input::placeholder,.form-group textarea::placeholder{color:var(--color-text-muted);opacity:.75}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px color-mix(in srgb,var(--color-primary) 18%,transparent)}.table{width:100%;border-collapse:collapse;font-size:14px}.table th,.table td{padding:12px;text-align:left;border-bottom:1px solid var(--color-border)}.table th{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--color-text-muted);font-weight:600}.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-size:11px;font-weight:600;letter-spacing:.02em}.badge-urgent{background:#fef2f2;color:var(--color-danger)}.badge-normal{background:var(--color-primary-soft);color:var(--color-primary)}.badge-due{background:#fffbeb;color:#b45309}.page-header{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:var(--space-5);gap:var(--space-4);flex-wrap:wrap}.page-header h1{margin:0;font-family:var(--font-display);font-size:28px;font-weight:600;letter-spacing:-.02em}.alert-error{background:#fef2f2;color:var(--color-danger);border:1px solid #fecaca;border-radius:var(--radius-md);padding:var(--space-3) var(--space-4);margin-bottom:var(--space-4);font-size:14px}.empty-state{text-align:center;padding:var(--space-7);color:var(--color-text-muted)}.hint{font-size:13px;color:var(--color-text-muted);margin:0 0 12px}.tabs{display:flex;gap:var(--space-2);flex-wrap:wrap;margin-bottom:var(--space-4)}.tabs button{padding:8px 14px;border:1px solid var(--color-border);background:var(--color-surface);border-radius:999px;cursor:pointer;font-size:13px;font-weight:600;color:var(--color-text-muted);transition:all var(--transition)}.tabs button:hover{border-color:var(--color-border-strong);color:var(--color-text)}.tabs button.active{background:var(--color-primary-soft);border-color:color-mix(in srgb,var(--color-primary) 30%,var(--color-border));color:var(--color-primary)}@media(max-width:768px){.stat-grid{grid-template-columns:repeat(2,1fr)}}.theme-fab{position:fixed;right:16px;bottom:80px;z-index:1000;width:44px;height:44px;border-radius:50%;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);box-shadow:var(--shadow-md);cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0;transition:background .15s,border-color .15s}.theme-fab{position:fixed;right:16px;bottom:80px;z-index:1000;width:44px;height:44px;border-radius:50%;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);box-shadow:var(--shadow-md);cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0;transition:border-color var(--transition),color var(--transition)}.theme-fab:hover{border-color:var(--color-primary);color:var(--color-primary)}.shell-admin .theme-fab,.shell-teacher .theme-fab,.shell-dev .theme-fab{bottom:16px}