@import url(https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap);:root{--primary:#4f46e5;--primary-dark:#3730a3;--primary-light:#eef2ff;--secondary:#0f766e;--secondary-light:#f0fdfa;--accent:#f59e0b;--accent-light:#fffbeb;--danger:#ef4444;--danger-light:#fef2f2;--success:#22c55e;--success-light:#f0fdf4;--bg:#f8fafc;--bg-card:#fff;--bg-dark:#0f172a;--text:#1e293b;--text-secondary:#64748b;--text-muted:#94a3b8;--border:#e2e8f0;--border-focus:#4f46e5;--shadow:0 1px 3px #00000014,0 1px 2px #0000000f;--shadow-lg:0 10px 25px #00000014,0 4px 10px #0000000a;--radius:12px;--radius-sm:8px;--radius-full:9999px}*{box-sizing:border-box;margin:0;padding:0}body{-webkit-font-smoothing:antialiased;background:#f8fafc;background:var(--bg);color:#1e293b;color:var(--text);font-family:Inter,-apple-system,sans-serif;line-height:1.6}.app-layout{display:flex;min-height:100vh}.sidebar{background:#0f172a;background:var(--bg-dark);bottom:0;color:#fff;display:flex;flex-direction:column;left:0;padding:24px 16px;position:fixed;top:0;width:260px;z-index:50}.sidebar-logo{border-bottom:1px solid #ffffff1a;font-size:20px;font-weight:700;margin-bottom:24px;padding:0 8px 24px}.sidebar-logo span{color:#f59e0b;color:var(--accent)}.sidebar-nav{display:flex;flex:1 1;flex-direction:column;gap:4px}.sidebar-link{align-items:center;border-radius:8px;border-radius:var(--radius-sm);color:#94a3b8;display:flex;font-size:14px;font-weight:500;gap:12px;padding:10px 12px;text-decoration:none;transition:all .2s}.sidebar-link:hover{background:#ffffff14;color:#fff}.sidebar-link.active{background:#4f46e5;background:var(--primary);color:#fff}.sidebar-link svg{flex-shrink:0;height:20px;width:20px}.sidebar-user{border-top:1px solid #ffffff1a;margin-top:auto;padding-top:16px}.sidebar-user-name{font-size:14px;font-weight:500}.sidebar-user-email{color:#94a3b8;font-size:12px}.main-content{flex:1 1;margin-left:260px;max-width:1200px;padding:32px}.page-header{margin-bottom:32px}.page-title{color:#1e293b;color:var(--text);font-size:28px;font-weight:700}.page-subtitle{color:#64748b;color:var(--text-secondary);font-size:15px;margin-top:4px}.card{background:#fff;background:var(--bg-card);border:1px solid #e2e8f0;border:1px solid var(--border);border-radius:12px;border-radius:var(--radius);box-shadow:0 1px 3px #00000014,0 1px 2px #0000000f;box-shadow:var(--shadow);padding:24px}.card-lg{padding:32px}.card-header{align-items:center;display:flex;justify-content:space-between;margin-bottom:20px}.card-title{font-size:18px;font-weight:600}.btn{align-items:center;border:none;border-radius:8px;border-radius:var(--radius-sm);cursor:pointer;display:inline-flex;font-family:inherit;font-size:14px;font-weight:500;gap:8px;justify-content:center;padding:10px 20px;text-decoration:none;transition:all .2s}.btn-primary{background:#4f46e5;background:var(--primary);color:#fff}.btn-primary:hover{background:#3730a3;background:var(--primary-dark);box-shadow:0 10px 25px #00000014,0 4px 10px #0000000a;box-shadow:var(--shadow-lg);transform:translateY(-1px)}.btn-primary:disabled{cursor:not-allowed;opacity:.5;transform:none}.btn-secondary{background:#f8fafc;background:var(--bg);border:1px solid #e2e8f0;border:1px solid var(--border);color:#1e293b;color:var(--text)}.btn-secondary:hover{border-color:#4f46e5;border-color:var(--primary);color:#4f46e5;color:var(--primary)}.btn-danger{background:#ef4444;background:var(--danger);color:#fff}.btn-success{background:#22c55e;background:var(--success);color:#fff}.btn-lg{border-radius:12px;border-radius:var(--radius);font-size:16px;padding:14px 28px}.btn-sm{font-size:13px;padding:6px 14px}.btn-icon{border-radius:9999px;border-radius:var(--radius-full);height:40px;padding:0;width:40px}.btn-full{width:100%}.form-group{margin-bottom:20px}.form-label{color:#1e293b;color:var(--text);display:block;font-size:14px;font-weight:500;margin-bottom:6px}.form-input{background:#fff;border:1px solid #e2e8f0;border:1px solid var(--border);border-radius:8px;border-radius:var(--radius-sm);font-family:inherit;font-size:14px;padding:10px 14px;transition:border-color .2s,box-shadow .2s;width:100%}.form-input:focus{border-color:#4f46e5;border-color:var(--border-focus);box-shadow:0 0 0 3px #4f46e51a;outline:none}.form-input::placeholder{color:#94a3b8;color:var(--text-muted)}.form-select{appearance:none;background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg width='12' height='8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='m1 1.5 5 5 5-5' stroke='%2364748B' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-position:right 14px center;background-repeat:no-repeat;padding-right:40px}.auth-container{align-items:center;background:linear-gradient(135deg,#eef2ff,#f8fafc 50%,#f0fdfa);display:flex;justify-content:center;min-height:100vh}.auth-card{max-width:420px;width:100%}.auth-logo{font-size:28px;font-weight:700;margin-bottom:32px;text-align:center}.auth-logo span{color:#4f46e5;color:var(--primary)}.auth-footer{color:#64748b;color:var(--text-secondary);font-size:14px;margin-top:20px;text-align:center}.auth-footer a{color:#4f46e5;color:var(--primary);font-weight:500;text-decoration:none}.stats-grid{grid-gap:16px;display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));margin-bottom:32px}.stat-card{gap:16px}.stat-card,.stat-icon{align-items:center;display:flex}.stat-icon{border-radius:12px;border-radius:var(--radius);height:48px;justify-content:center;width:48px}.stat-icon.purple{background:#eef2ff;background:var(--primary-light);color:#4f46e5;color:var(--primary)}.stat-icon.green{background:#f0fdf4;background:var(--success-light);color:#22c55e;color:var(--success)}.stat-icon.amber{background:#fffbeb;background:var(--accent-light);color:#f59e0b;color:var(--accent)}.stat-icon.red{background:#fef2f2;background:var(--danger-light);color:#ef4444;color:var(--danger)}.stat-value{font-size:24px;font-weight:700;line-height:1.2}.stat-label{color:#64748b;color:var(--text-secondary);font-size:13px}.mode-grid{grid-gap:20px;display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.mode-card{cursor:pointer;overflow:hidden;position:relative;transition:all .2s}.mode-card:hover{box-shadow:0 10px 25px #00000014,0 4px 10px #0000000a;box-shadow:var(--shadow-lg);transform:translateY(-2px)}.mode-card.selected{border-color:#4f46e5;border-color:var(--primary);box-shadow:0 0 0 2px #4f46e5;box-shadow:0 0 0 2px var(--primary)}.mode-card-icon{align-items:center;border-radius:12px;border-radius:var(--radius);display:flex;font-size:24px;height:56px;justify-content:center;margin-bottom:16px;width:56px}.mode-card-title{font-size:16px;font-weight:600;margin-bottom:4px}.mode-card-desc{color:#64748b;color:var(--text-secondary);font-size:13px}.chat-container{display:flex;flex-direction:column;height:calc(100vh - 64px)}.chat-header{align-items:center;background:#fff;background:var(--bg-card);border-bottom:1px solid #e2e8f0;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;padding:16px 24px}.chat-messages{display:flex;flex:1 1;flex-direction:column;gap:16px;overflow-y:auto;padding:24px}.chat-message{animation:fadeIn .3s ease;border-radius:16px;font-size:14px;line-height:1.6;max-width:75%;padding:14px 18px}.chat-message.ai{align-self:flex-start;background:#fff;background:var(--bg-card);border:1px solid #e2e8f0;border:1px solid var(--border);border-bottom-left-radius:4px}.chat-message.user{align-self:flex-end;background:#4f46e5;background:var(--primary);border-bottom-right-radius:4px;color:#fff}.chat-input-area{align-items:flex-end;background:#fff;background:var(--bg-card);border-top:1px solid #e2e8f0;border-top:1px solid var(--border);display:flex;gap:12px;padding:16px 24px}.chat-textarea{border:1px solid #e2e8f0;border:1px solid var(--border);border-radius:12px;border-radius:var(--radius);flex:1 1;font-family:inherit;font-size:14px;max-height:120px;min-height:48px;padding:12px 16px;resize:none;transition:border-color .2s}.chat-textarea:focus{border-color:#4f46e5;border-color:var(--border-focus);outline:none}.mcq-option{align-items:center;border:1px solid #e2e8f0;border:1px solid var(--border);border-radius:8px;border-radius:var(--radius-sm);cursor:pointer;display:flex;gap:12px;padding:14px 18px;transition:all .2s}.mcq-option.selected,.mcq-option:hover{background:#eef2ff;background:var(--primary-light);border-color:#4f46e5;border-color:var(--primary)}.mcq-option.correct{background:#f0fdf4;background:var(--success-light);border-color:#22c55e;border-color:var(--success)}.mcq-option.wrong{background:#fef2f2;background:var(--danger-light);border-color:#ef4444;border-color:var(--danger)}.mcq-label{background:#f8fafc;background:var(--bg);border:1px solid #e2e8f0;border:1px solid var(--border);border-radius:9999px;border-radius:var(--radius-full);flex-shrink:0;font-size:13px;font-weight:600;height:28px;justify-content:center;width:28px}.mcq-label,.voice-recorder{align-items:center;display:flex}.voice-recorder{flex-direction:column;gap:16px;padding:32px}.record-btn{align-items:center;border:none;border-radius:9999px;border-radius:var(--radius-full);cursor:pointer;display:flex;font-size:28px;height:72px;justify-content:center;transition:all .2s;width:72px}.record-btn.idle,.record-btn.recording{background:#ef4444;background:var(--danger);color:#fff}.record-btn.recording{animation:pulse 1.5s infinite}.record-timer{font-feature-settings:"tnum";font-size:32px;font-variant-numeric:tabular-nums;font-weight:600}.score-circle{align-items:center;border:6px solid #4f46e5;border:6px solid var(--primary);border-radius:9999px;border-radius:var(--radius-full);display:flex;flex-direction:column;height:160px;justify-content:center;margin:0 auto 24px;width:160px}.score-value{color:#4f46e5;color:var(--primary);font-size:42px;font-weight:700;line-height:1}.score-label{color:#64748b;color:var(--text-secondary);font-size:13px;margin-top:4px}.grade-badge{align-items:center;border-radius:8px;border-radius:var(--radius-sm);color:#fff;display:inline-flex;font-size:20px;font-weight:700;height:48px;justify-content:center;width:48px}.grade-A{background:#22c55e;background:var(--success)}.grade-B{background:#4f46e5;background:var(--primary)}.grade-C{background:#f59e0b;background:var(--accent)}.grade-D{background:#ef4444;background:var(--danger)}.rubric-bar{align-items:center;display:flex;gap:12px;margin-bottom:12px}.rubric-label{flex-shrink:0;font-size:13px;font-weight:500;width:140px}.rubric-track{background:#f8fafc;background:var(--bg);border-radius:4px;flex:1 1;height:8px;overflow:hidden}.rubric-fill{border-radius:4px;height:100%;transition:width .8s ease}.rubric-score{font-size:13px;font-weight:600;text-align:right;width:40px}.feedback-do{border-left:3px solid #22c55e;border-left:3px solid var(--success)}.feedback-do,.feedback-dont{margin-bottom:12px;padding-left:16px}.feedback-dont{border-left:3px solid #ef4444;border-left:3px solid var(--danger)}.feedback-tip{border-left:3px solid #4f46e5;border-left:3px solid var(--primary);margin-bottom:12px;padding-left:16px}.upload-zone{border:2px dashed #e2e8f0;border:2px dashed var(--border);border-radius:12px;border-radius:var(--radius);cursor:pointer;padding:48px;text-align:center;transition:all .2s}.upload-zone.active,.upload-zone:hover{background:#eef2ff;background:var(--primary-light);border-color:#4f46e5;border-color:var(--primary)}.upload-icon{color:#94a3b8;color:var(--text-muted);font-size:48px;margin-bottom:16px}.progress-bar{align-items:center;display:flex;gap:4px}.progress-step{background:#e2e8f0;background:var(--border);border-radius:2px;flex:1 1;height:4px}.progress-step.done{background:#4f46e5;background:var(--primary)}.progress-step.current{background:#f59e0b;background:var(--accent)}.tag{border-radius:9999px;border-radius:var(--radius-full);display:inline-flex;font-size:12px;font-weight:500;padding:4px 10px}.tag-primary{background:#eef2ff;background:var(--primary-light);color:#4f46e5;color:var(--primary)}.tag-success{background:#f0fdf4;background:var(--success-light);color:#16a34a}.tag-danger{background:#fef2f2;background:var(--danger-light);color:#ef4444;color:var(--danger)}.tag-amber{background:#fffbeb;background:var(--accent-light);color:#d97706}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{box-shadow:0 0 0 0 #ef444466}50%{box-shadow:0 0 0 16px #ef444400}}@keyframes spin{to{transform:rotate(1turn)}}.spinner{animation:spin .6s linear infinite;border:2px solid #e2e8f0;border-top-color:#4f46e5;border:2px solid var(--border);border-radius:50%;border-top-color:var(--primary);height:20px;width:20px}@media (max-width:768px){.sidebar{display:none}.main-content{margin-left:0;padding:16px}.chat-message{max-width:90%}.stats-grid{grid-template-columns:1fr 1fr}.mode-grid{grid-template-columns:1fr}}.loading-screen{align-items:center;color:#64748b;color:var(--text-secondary);display:flex;font-size:16px;justify-content:center;min-height:100vh}