@import url(https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap);*{box-sizing:border-box;margin:0;padding:0}:root{--gradient-orange:#ff6b35;--gradient-pink:#f857a6;--gradient-purple:#7f5af0;--gradient-blue:#4361ee;--glass-bg:#ffffff26;--glass-border:#fff3;--glass-shadow:0 8px 32px #0000001a;--text-white:#fff;--text-light:#ffffffe6;--text-muted:#ffffffb3;--text-dark:#1a1a2e;--accent-yellow:#ffd93d;--accent-green:#6bcb77;--accent-red:#ff6b6b;--btn-primary:#fff3;--btn-primary-hover:#ffffff4d;--shadow-soft:0 4px 30px #0000001a;--shadow-glow:0 0 40px #7f5af04d}body{background:linear-gradient(135deg,#ff6b35,#f857a6 25%,#7f5af0 50%,#4361ee);background:linear-gradient(135deg,var(--gradient-orange) 0,var(--gradient-pink) 25%,var(--gradient-purple) 50%,var(--gradient-blue) 100%);background-attachment:fixed;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.6;min-height:100vh}body,h1,h2,h3,h4,h5,h6{color:#fff;color:var(--text-white)}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.3}.glass-card{backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);background:#ffffff26;background:var(--glass-bg);border:1px solid #fff3;border:1px solid var(--glass-border);border-radius:24px;box-shadow:0 8px 32px #0000001a;box-shadow:var(--glass-shadow)}.glass-btn{align-items:center;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);background:#fff3;background:var(--btn-primary);border:1px solid #fff3;border:1px solid var(--glass-border);border-radius:16px;color:#fff;color:var(--text-white);cursor:pointer;display:flex;flex-direction:column;font-size:14px;font-weight:500;gap:8px;padding:16px 24px;transition:all .3s ease}.glass-btn:hover{background:#ffffff4d;background:var(--btn-primary-hover);transform:translateY(-2px)}.glass-btn:active{transform:translateY(0)}.glass-btn-icon{align-items:center;background:#ffffff1a;border-radius:12px;display:flex;font-size:20px;height:48px;justify-content:center;width:48px}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.8;transform:scale(1.02)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#ffffff1a;border-radius:4px}::-webkit-scrollbar-thumb{background:#ffffff4d;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#fff6}.app{display:flex;flex-direction:column;min-height:100vh}.app-header{animation:fadeIn .5s ease-out;justify-content:center;padding:20px 24px}.app-header,.logo{align-items:center;display:flex}.logo{gap:12px}.logo-text{color:var(--text-white);font-size:24px;font-style:italic;font-weight:700;letter-spacing:-.5px}.app-main{align-items:center;display:flex;flex:1 1;flex-direction:column;justify-content:center;padding:20px}.app-footer{color:var(--text-muted);font-size:14px;padding:20px;text-align:center}.app-footer p{opacity:.8}.loading{animation:fadeIn .3s ease-out;text-align:center}.loading-spinner{animation:spin 1s linear infinite;border:3px solid #fff3;border-radius:50%;border-top:3px solid var(--text-white);height:48px;margin:0 auto 16px;width:48px}.loading p{color:var(--text-muted)}.error-message{animation:fadeIn .3s ease-out;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:24px;max-width:400px;padding:32px;text-align:center}.error-icon{display:block;font-size:48px;margin-bottom:16px}.error-message p{color:var(--text-muted);margin-bottom:24px}.error-message button{background:#fff3;border:1px solid var(--glass-border);border-radius:12px;color:var(--text-white);cursor:pointer;font-size:14px;font-weight:500;padding:12px 24px;transition:all .2s}.error-message button:hover{background:#ffffff4d}.lesson-select{animation:slideUp .5s ease-out;max-width:600px;padding:20px;width:100%}.lesson-select-title{color:var(--text-white);font-size:24px;font-weight:600;margin-bottom:32px;text-align:center}.lessons-grid{display:flex;flex-direction:column;gap:16px}.lesson-card{align-items:center;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:20px;cursor:pointer;display:flex;justify-content:space-between;padding:20px 24px;text-align:left;transition:all .3s ease}.lesson-card:hover{background:#ffffff40;transform:translateY(-2px)}.lesson-card-content{flex:1 1}.lesson-title{color:var(--text-white);font-size:17px;font-weight:600;margin-bottom:4px}.lesson-subject{color:var(--text-muted);font-size:14px}.lesson-arrow{color:var(--text-muted);font-size:20px;transition:transform .2s}.lesson-card:hover .lesson-arrow{color:var(--text-white);transform:translateX(4px)}.lesson-select-empty{-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);background:var(--glass-bg);border:1px dashed var(--glass-border);border-radius:24px;padding:60px 40px;text-align:center}.lesson-select-empty h2{font-size:20px;margin-bottom:8px}.lesson-select-empty p{color:var(--text-muted);font-size:14px}.voice-call{animation:slideUp .5s ease-out;max-width:500px}.call-container,.voice-call{align-items:center;display:flex;flex-direction:column;width:100%}.call-container{backdrop-filter:blur(30px);-webkit-backdrop-filter:blur(30px);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:32px;box-shadow:var(--shadow-soft);padding:32px 24px}.call-header{margin-bottom:24px;text-align:center}.call-header h2{color:var(--text-white);font-size:22px;font-weight:600;margin-bottom:4px}.call-header p{color:var(--text-muted);font-size:14px}.teacher-avatar{align-items:center;display:flex;height:140px;justify-content:center;margin-bottom:20px;position:relative;width:140px}.teacher-avatar img{filter:drop-shadow(0 8px 20px rgba(0,0,0,.2));height:100%;object-fit:contain;transition:opacity .3s ease;width:100%}.avatar-placeholder{animation:spin 1s linear infinite;border:3px solid #fff3;border-radius:50%;border-top:3px solid var(--text-white);height:60px;position:absolute;width:60px}@keyframes spin{to{transform:rotate(1turn)}}.teacher-avatar.speaking{animation:pulse 1.5s ease-in-out infinite}.teacher-avatar.speaking:after{animation:glow 2s ease-in-out infinite;background:radial-gradient(circle,#7f5af040 0,#0000 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infinite;background:var(--accent-green);border-radius:50%;height:8px;width:8px}.status-dot.listening{background:var(--accent-yellow)}.status-dot.speaking{background:var(--accent-green)}.status-dot.inactive{animation:none;background:#ffffff4d}.call-actions{display:flex;gap:16px;justify-content:center;width:100%}.action-btn{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffff1a;border:1px solid var(--glass-border);border-radius:16px;color:var(--text-white);cursor:pointer;flex:1 1;font-size:15px;font-weight:500;max-width:150px;padding:16px 20px;transition:all .3s ease}.action-btn:hover:not(:disabled){background:#fff3;transform:translateY(-2px)}.action-btn:disabled{cursor:not-allowed;opacity:.5}.action-btn.mic-active{background:#6bcb774d;border-color:var(--accent-green)}.action-btn.mic-speaking{animation:pulse .5s ease-in-out infinite;background:#ffd93d4d;border-color:var(--accent-yellow)}.action-btn.start-btn{background:#6bcb774d;border-color:var(--accent-green)}.action-btn.start-btn:hover{background:#6bcb7780}.action-btn.end-call:hover{background:#ff6b6b4d;border-color:var(--accent-red)}@media (max-width:480px){.call-container{border-radius:24px;padding:24px 16px}.teacher-avatar{height:120px;width:120px}.call-header h2{font-size:20px}}
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