:root{--primary:#0ea5e9;--primary-hover:#0284c7;--secondary:#22c55e;--accent:#eab308;--danger:#ef4444;--background:#fdfbf7;--foreground:#2d3748;--card:#fff;--card-foreground:#2d3748;--border:#eae6df;--input:#fff;--ring:#0ea5e9;--radius:.5rem;--font-sans:"Inter", system-ui, -apple-system, sans-serif;--focus-ring:3px;--touch-target:44px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--background);color:var(--foreground);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden}.glass{background:var(--card);border:1px solid var(--border);color:var(--card-foreground);box-shadow:0 1px 3px #0000001a,0 1px 2px -1px #0000001a}.glass-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);color:var(--card-foreground);padding:1.5rem;transition:transform .2s,box-shadow .2s;box-shadow:0 1px 3px #0000001a,0 1px 2px -1px #0000001a}.glass-card:hover{transform:translateY(-2px);box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-backdrop{-webkit-backdrop-filter:blur(4px);z-index:1000;background:#0f172a66;justify-content:center;align-items:center;padding:1rem;display:flex;position:fixed;inset:0}.fade-in{animation:.6s ease-out forwards fadeIn}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.8;transform:scale(1.05)}}.pulse{animation:2s ease-in-out infinite pulse}.btn{border-radius:var(--radius);cursor:pointer;min-height:var(--touch-target);border:none;justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-size:.95rem;font-weight:600;transition:all .2s;display:inline-flex}.btn:focus-visible{outline:var(--focus-ring) solid var(--ring);outline-offset:2px}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-outline{border:1px solid var(--border);color:var(--foreground);background:0 0}.btn-outline:hover{border-color:var(--primary);background:#0000000d}.layout{min-height:100vh;display:flex}.sidebar{border-right:1px solid var(--border);background:var(--card);flex-direction:column;gap:2rem;width:280px;height:100vh;padding:2rem;display:flex;position:sticky;top:0}.main-content{flex:1;width:100%;max-width:1400px;margin:0 auto;padding:2.5rem}h1{letter-spacing:-.025em;color:var(--foreground);margin-bottom:.75rem;font-size:2rem;font-weight:800}h2{color:var(--foreground);margin-bottom:.75rem;font-size:1.5rem;font-weight:700}p{color:#475569;line-height:1.6}.grid-cols-2{grid-template-columns:repeat(2,1fr);gap:1.5rem;display:grid}.grid-cols-3{grid-template-columns:repeat(3,1fr);gap:1.5rem;display:grid}@media (width<=1024px){.grid-cols-3,.grid-cols-2{grid-template-columns:repeat(2,1fr)}}@media (width<=768px){.grid-cols-3,.grid-cols-2{grid-template-columns:1fr}.sidebar{display:none}}.input-field{background:var(--input);border:1px solid var(--border);width:100%;color:var(--foreground);border-radius:var(--radius);min-height:var(--touch-target);outline:none;padding:.85rem 1rem;font-family:inherit;font-size:1rem;transition:all .2s}.input-field:focus{border-color:var(--primary);box-shadow:0 0 0 1px var(--primary)}.input-field:focus-visible{outline:var(--focus-ring) solid var(--ring);outline-offset:2px}.input-field::placeholder{color:#94a3b8}input[type=month]::-webkit-calendar-picker-indicator{cursor:pointer;opacity:.6;transition:opacity .2s}input[type=date]::-webkit-calendar-picker-indicator{cursor:pointer;opacity:.6;transition:opacity .2s}input[type=month]::-webkit-calendar-picker-indicator:hover{opacity:1}input[type=date]::-webkit-calendar-picker-indicator:hover{opacity:1}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#f1f5f9}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:10px}::-webkit-scrollbar-thumb:hover{background:#94a3b8}.tab-nav{border-bottom:1px solid var(--border);flex-wrap:wrap;gap:.5rem;margin-bottom:1.5rem;padding-bottom:.5rem;display:flex}.tab-btn{color:#64748b;border-radius:var(--radius);cursor:pointer;background:0 0;border:none;align-items:center;gap:.5rem;padding:.75rem 1.25rem;font-size:.95rem;font-weight:600;transition:all .2s;display:flex}.tab-btn:hover{color:var(--foreground);background:#00000008}.tab-active{background:var(--card);color:var(--primary);border:1px solid var(--border);box-shadow:0 1px 3px #0000000d}.stat-pill{border-radius:2rem;align-items:center;gap:.5rem;padding:.5rem 1rem;font-size:.9rem;font-weight:600;display:flex}.stat-present{color:#166534;background:#dcfce7}.stat-absent{color:#991b1b;background:#fee2e2}.attendance-list{flex-direction:column;gap:.75rem;display:flex}.attendance-row{background:var(--card);border-radius:var(--radius);border:1px solid var(--border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:1rem;padding:1rem 1.25rem;transition:all .2s;display:flex}.attendance-row:hover{box-shadow:0 2px 4px #00000005}.attendance-row.present{background:#f0fdf4;border-color:#bbf7d0}.attendance-row.absent{background:#fef2f2;border-color:#fecaca}.student-avatar{background:var(--primary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;font-size:1.1rem;font-weight:700;display:flex}.attendance-toggle-btn{border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;color:#64748b;background:#fff;align-items:center;gap:.25rem;padding:.5rem 1rem;font-weight:600;transition:all .2s;display:flex}.attendance-toggle-btn:hover{background:#f8fafc}.toggle-present-active{color:#fff;background:#22c55e;border-color:#22c55e}.toggle-present-active:hover{background:#16a34a}.toggle-absent-active{color:#fff;background:#ef4444;border-color:#ef4444}.toggle-absent-active:hover{background:#dc2626}.plan-list{flex-direction:column;gap:1rem;display:flex}.plan-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.plan-card-header{border-bottom:1px solid var(--border);background:#f8fafc;padding:.75rem 1.25rem}.plan-date-info{color:var(--foreground);align-items:center;gap:.5rem;font-weight:600;display:flex}.plan-fields{flex-direction:column;gap:1rem;padding:1.25rem;display:flex}.plan-field{flex-direction:column;gap:.5rem;display:flex}.plan-label{color:#475569;align-items:center;gap:.4rem;font-size:.9rem;font-weight:600;display:flex}.plan-input{border:1px solid var(--border);border-radius:var(--radius);width:100%;padding:.75rem;font-family:inherit;font-size:.95rem;transition:all .2s}.plan-input:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 2px #0ea5e91a}.lessons-history{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem;display:grid}.history-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;transition:all .2s}.history-card:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:0 4px 6px -1px #0000000d}.history-photo{border-radius:var(--radius);background:#e2e8f0;width:80px;height:80px;overflow:hidden}.camera-overlay{-webkit-backdrop-filter:blur(4px);z-index:1000;background:#0f172a66;justify-content:center;align-items:center;padding:1rem;display:flex;position:fixed;inset:0}.camera-modal{flex-direction:column;width:100%;max-width:640px;display:flex}.camera-header{justify-content:space-between;align-items:center;margin-bottom:1rem;display:flex}.camera-close-btn{color:#64748b;cursor:pointer;border-radius:var(--radius);background:0 0;border:none;justify-content:center;align-items:center;padding:.5rem;transition:all .2s;display:flex}.camera-close-btn:hover{color:var(--danger);background:#f1f5f9}.camera-viewport{aspect-ratio:16/9;border-radius:var(--radius);background:#000;width:100%;margin-bottom:1.5rem;position:relative;overflow:hidden;box-shadow:inset 0 0 0 1px #0000001a}.camera-guide{pointer-events:none;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.camera-guide-circle{border:2px dashed #ffffff80;border-radius:50%;width:250px;height:300px;box-shadow:0 0 0 2000px #0000004d}.camera-actions{justify-content:center;align-items:center;margin-top:1rem;display:flex}.capture-btn{cursor:pointer;background:#e2e8f0;border:4px solid #fff;border-radius:50%;justify-content:center;align-items:center;width:72px;height:72px;transition:all .2s;display:flex;box-shadow:0 0 0 2px #cbd5e1,0 4px 6px #0000001a}.capture-btn:hover{box-shadow:0 0 0 2px var(--primary), 0 4px 6px #0000001a}.capture-btn:active{transform:scale(.95)}.capture-btn-inner{background:#fff;border-radius:50%;width:56px;height:56px;transition:all .2s}.capture-btn:hover .capture-btn-inner{background:#f8fafc}.capture-btn:active .capture-btn-inner{width:50px;height:50px}