:root{--bleufonce: rgb(43, 92, 178);--bleuclair: rgb(232, 240, 253);--vertcorr: rgb(46, 173, 111);--rougeclair: rgb(233, 99, 88);--violetclair: rgb(151, 116, 210);--jauneaccent: rgb(255, 179, 71);--grisclair: rgb(248, 245, 240);--texte: rgb(46, 41, 38);--radius: 16px;--radius-sm: 11px;--ombre: 0 4px 16px rgba(43, 92, 178, .08);--ombre-hover: 0 8px 22px rgba(43, 92, 178, .14)}*{box-sizing:border-box}body{margin:0;font-family:Nunito,Helvetica Neue,Helvetica,Arial,sans-serif;background:var(--grisclair);color:var(--texte)}h1,h2,h3,h4{font-family:"Baloo 2",Nunito,sans-serif}a{color:var(--bleufonce)}.app-header{background:linear-gradient(120deg,var(--bleufonce),rgb(76,128,214));color:#fff;padding:16px 26px;display:flex;align-items:center;justify-content:space-between;box-shadow:0 2px 12px #2b5cb22e}.app-header h1{font-size:1.3rem;margin:0;letter-spacing:.2px}.app-header button{background:#ffffff2e;color:#fff;border:none;padding:9px 16px;border-radius:20px;cursor:pointer;font-family:Nunito,sans-serif;font-weight:600;transition:background .15s ease,transform .15s ease}.app-header button:hover{background:#ffffff4d;transform:translateY(-1px)}.container{max-width:960px;margin:0 auto;padding:28px 24px}.card{background:#fff;border-radius:var(--radius);padding:22px;box-shadow:var(--ombre);margin-bottom:18px;border:1px solid rgba(43,92,178,.06)}.btn{background:var(--bleufonce);color:#fff;border:none;padding:11px 20px;border-radius:999px;cursor:pointer;font-size:.95rem;font-family:Nunito,sans-serif;font-weight:700;transition:transform .12s ease,box-shadow .12s ease,opacity .12s ease;box-shadow:0 2px 8px #2b5cb240}.btn:hover{opacity:.95;transform:translateY(-1px);box-shadow:0 4px 12px #2b5cb24d}.btn:active{transform:translateY(0)}.btn.green{background:var(--vertcorr);box-shadow:0 2px 8px #2ead6f4d}.btn.red{background:var(--rougeclair);box-shadow:0 2px 8px #e963584d}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}input,select,textarea{width:100%;padding:11px 14px;border:1.5px solid #e2ddd3;border-radius:var(--radius-sm);font-size:.95rem;margin-bottom:12px;font-family:inherit;color:var(--texte);background:#fff;transition:border-color .15s ease,box-shadow .15s ease}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--bleufonce);box-shadow:0 0 0 3px var(--bleuclair)}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:11px 10px;border-bottom:1px solid #f0ece4}th{color:var(--bleufonce);font-size:.8rem;text-transform:uppercase;letter-spacing:.4px}tr:hover td{background:#2b5cb208}.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}.table-scroll table{min-width:480px}.home-card{background:#fff;border-radius:var(--radius);padding:30px 22px;box-shadow:var(--ombre);text-decoration:none;display:flex;flex-direction:column;align-items:center;text-align:center;border:1px solid rgba(43,92,178,.06);transition:transform .15s ease,box-shadow .15s ease}.home-card:hover{transform:translateY(-5px);box-shadow:var(--ombre-hover)}.home-card .btn{pointer-events:none}.login-wrap{max-width:400px;margin:8vh auto;padding:0 16px}.login-wrap h1{color:var(--bleufonce);text-align:center;font-size:clamp(1.5rem,8vw,2rem)}.tabs{display:flex;gap:6px;margin-bottom:18px;background:var(--grisclair);padding:5px;border-radius:999px}.tabs button{flex:1;padding:10px;border:none;background:transparent;color:var(--bleufonce);border-radius:999px;cursor:pointer;font-family:Nunito,sans-serif;font-weight:700;font-size:.9rem;transition:background .15s ease,color .15s ease}.tabs button.active{background:var(--bleufonce);color:#fff;box-shadow:0 2px 8px #2b5cb24d}.error{color:var(--rougeclair);font-size:.9rem;margin:8px 0;font-weight:600;background:#e9635814;padding:8px 12px;border-radius:var(--radius-sm)}.badge{display:inline-block;padding:5px 13px;border-radius:999px;font-size:.78rem;font-weight:700;background:var(--violetclair);color:#fff}.chat-box{height:60vh;overflow-y:auto;padding:18px;background:var(--grisclair);border-radius:var(--radius);margin-bottom:14px}.msg{margin-bottom:14px;display:flex}.msg.user{justify-content:flex-end}.bubble{max-width:78%;padding:13px 17px;border-radius:18px;line-height:1.55;font-size:.97rem}.msg.user .bubble{background:var(--bleufonce);color:#fff;border-bottom-right-radius:6px;box-shadow:0 2px 8px #2b5cb233}.msg.assistant .bubble{background:#fff;border-bottom-left-radius:6px;box-shadow:0 1px 4px #0000000f}.chat-input{display:flex;gap:10px}.chat-input input{margin:0}.video-banner{background:#ffb34724;border:1.5px dashed var(--jauneaccent);padding:14px 18px;border-radius:var(--radius-sm);margin-bottom:14px;font-size:.95rem}.math-palette{background:#fff;border:1.5px solid #f0ece4;border-radius:var(--radius-sm);padding:10px;margin-bottom:10px}.math-palette-tabs{display:flex;gap:6px;margin-bottom:8px;flex-wrap:wrap}.math-palette-tabs button{padding:6px 13px;border:1.5px solid var(--bleufonce);background:#fff;color:var(--bleufonce);border-radius:999px;cursor:pointer;font-size:.83rem;font-family:Nunito,sans-serif;font-weight:700}.math-palette-tabs button.active{background:var(--bleufonce);color:#fff}.math-palette-symbols{display:flex;flex-wrap:wrap;gap:6px}.math-palette-symbols button{min-width:40px;height:40px;padding:0 9px;border:1.5px solid #eee5d8;background:var(--grisclair);border-radius:10px;cursor:pointer;font-size:1.05rem;color:var(--texte);transition:background .15s ease,color .15s ease,border-color .15s ease}.math-palette-symbols button:hover{background:var(--violetclair);color:#fff;border-color:var(--violetclair)}.image-preview{position:relative;display:inline-block;margin-bottom:8px}.image-preview img{max-height:120px;border-radius:var(--radius-sm);border:1.5px solid #eee5d8}.image-preview button{position:absolute;top:-8px;right:-8px;width:24px;height:24px;border-radius:50%;border:none;background:var(--rougeclair);color:#fff;cursor:pointer;font-size:.8rem}.btn-image{background:var(--grisclair);border:1.5px solid #eee5d8;border-radius:var(--radius-sm);font-size:1.2rem;cursor:pointer;padding:0 14px;transition:background .15s ease}.btn-image:hover{background:var(--violetclair)}.msg-image{max-width:100%;border-radius:12px;margin-bottom:6px;display:block}@media (max-width: 640px){.container{padding:18px 14px}.card{padding:16px;border-radius:var(--radius-sm);margin-bottom:14px}.app-header{padding:12px 16px;flex-wrap:wrap;gap:8px}.app-header h1{font-size:1.05rem}.app-header button{padding:7px 12px;font-size:.85rem}.btn{padding:10px 16px;font-size:.9rem}input,select,textarea{padding:10px 12px;font-size:.92rem}th,td{padding:8px;font-size:.85rem}.chat-box{height:52vh;padding:12px}.bubble{max-width:90%;font-size:.93rem;padding:11px 14px}.chat-input{gap:6px}.btn-image{padding:0 10px;font-size:1.05rem}.math-palette-symbols button{min-width:36px;height:36px;font-size:.95rem}.login-wrap{margin:4vh auto}.tabs button{font-size:.85rem;padding:9px}.form-grid{grid-template-columns:1fr!important}}@media (max-width: 380px){.bubble{max-width:94%}}