:root{--primary:#2563eb;--primary-hover:#1d4ed8;--primary-light:#eff6ff;--text-main:#0f172a;--text-muted:#64748b;--bg-body:#f8fafc;--bg-card:#fff;--border:#e2e8f0;--border-focus:#94a3b8;--radius:12px;--radius-sm:8px;--shadow-sm:0 1px 2px 0 #0000000d;--shadow:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--danger:#ef4444;--danger-light:#fef2f2}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-body);color:var(--text-main);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5}a{color:inherit;text-decoration:none}button{cursor:pointer;background:0 0;border:none;font-family:inherit}.container{width:100%;max-width:1100px;margin:0 auto;padding:0 1.25rem}.navbar{background:var(--bg-card);border-bottom:1px solid var(--border);z-index:50;position:sticky;top:0}.navbar-inner{justify-content:space-between;align-items:center;height:64px;display:flex}.brand{color:var(--primary);align-items:center;gap:.75rem;font-size:1.15rem;font-weight:700;display:flex}.nav-links{align-items:center;gap:1.25rem;display:flex}.nav-link{color:var(--text-muted);font-size:.95rem;font-weight:500;transition:color .15s}.nav-link:hover,.nav-link.active{color:var(--primary)}.btn{border-radius:var(--radius-sm);justify-content:center;align-items:center;gap:.5rem;padding:.6rem 1.1rem;font-size:.9rem;font-weight:500;transition:all .15s ease-in-out;display:inline-flex}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-outline{border:1px solid var(--border);color:var(--text-main);background:0 0}.btn-outline:hover{background:#f1f5f9}.btn-danger{background:var(--danger-light);color:var(--danger);border:1px solid #fecaca}.btn-danger:hover{background:var(--danger);color:#fff}.btn-sm{padding:.4rem .75rem;font-size:.82rem}.badge{text-transform:uppercase;letter-spacing:.04em;border-radius:9999px;align-items:center;padding:.2rem .55rem;font-size:.75rem;font-weight:600;display:inline-flex}.badge-cours{color:#1e40af;background:#dbeafe}.badge-exercices{color:#92400e;background:#fef3c7}.badge-correction{color:#166534;background:#dcfce7}.badge-tp{color:#6b21a8;background:#f3e8ff}.badge-evaluation{color:#991b1b;background:#fee2e2}.badge-autre{color:#475569;background:#f1f5f9}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:1.25rem;transition:transform .15s,box-shadow .15s}.card:hover{box-shadow:var(--shadow)}.grid-chapters{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem;margin-top:1rem;display:grid}.grid-documents{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1.25rem;margin-top:1.25rem;display:grid}.form-input,.form-select{border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text-main);background:#fff;outline:none;padding:.65rem .85rem;font-size:.95rem}.form-input:focus,.form-select:focus{border-color:var(--primary);box-shadow:0 0 0 3px #2563eb26}.footer{border-top:1px solid var(--border);text-align:center;color:var(--text-muted);margin-top:4rem;padding:2rem 0;font-size:.85rem}