:root{--bg: #f5f7fb;--panel: #ffffff;--border: #e3e8f0;--text: #1f2430;--muted: #6b7280;--primary: #4f46e5;--primary-dark: #4338ca;--ai-bubble: #eef1fb;--user-bubble: #dbe9ff;--green: #10b981;--red: #ef4444;--amber: #f59e0b;--radius: 14px}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:16px;background:var(--bg);color:var(--text)}.app{height:100vh;display:grid;grid-template-rows:56px 1fr auto;grid-template-columns:1fr 320px;grid-template-areas:"header header" "chat   side" "footer footer"}.header{grid-area:header;display:flex;align-items:center;gap:16px;padding:0 20px;background:var(--panel);border-bottom:1px solid var(--border)}.logo{font-size:17px}.scenario-select{margin-left:auto;padding:6px 10px;border:1px solid var(--border);border-radius:8px;background:#fff;font-size:14px;cursor:pointer}.status-dot{font-size:13px;margin-left:8px}.chat{grid-area:chat;overflow-y:auto;padding:16px 20px;scroll-behavior:smooth}.chat-inner{max-width:720px;margin:0 auto 56px}.welcome{text-align:center;color:var(--muted);margin-top:80px}.welcome h2{font-size:24px;color:var(--text);margin-bottom:12px}.welcome p{margin:6px 0}.msg{display:flex;gap:10px;margin-bottom:14px;align-items:flex-start}.msg-avatar{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:#fff;border:1px solid var(--border);font-size:16px;flex-shrink:0}.msg-user{flex-direction:row-reverse}.msg-bubble{padding:12px 16px;border-radius:var(--radius);max-width:75%;line-height:1.6;font-size:17px;background:var(--ai-bubble);border:1px solid var(--border);white-space:pre-wrap}.msg-user .msg-bubble{background:var(--user-bubble);border-color:#bfd4ff}.msg-reveal{padding:8px 18px;border:1px solid var(--border);border-radius:var(--radius);background:var(--ai-bubble);color:var(--primary);font-size:15px;cursor:pointer}.msg-reveal:hover{background:#e2e7fb;border-color:var(--primary)}.msg-bubble.interim{opacity:.6;font-style:italic}.msg-bubble.thinking{color:var(--muted);font-style:italic;animation:pulse 1.4s infinite}.msg-bubble:has(.error),.msg .error{color:var(--red)}@keyframes pulse{50%{opacity:.4}}.msg-fix{margin-top:8px;padding:8px 12px;border-radius:8px;background:#fff7e6;border:1px solid #f0d9a8;font-size:15px}.msg-fix .msg-reason{color:var(--muted);margin-top:2px;font-size:14px}.feedback-side{grid-area:side;border-left:1px solid var(--border);background:var(--panel);overflow-y:auto;padding:16px}.feedback-panel{font-size:15px}.feedback-title{font-weight:600;margin-bottom:10px}.feedback-flow{display:flex;align-items:center;gap:8px;margin-bottom:12px;color:var(--muted);font-size:14px}.flow-bar{flex:1;height:6px;background:var(--border);border-radius:3px;overflow:hidden}.flow-fill{height:100%;background:var(--green);transition:width .4s}.feedback-praise{background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46;padding:8px 10px;border-radius:8px;margin-bottom:12px}.feedback-block{margin-bottom:14px}.feedback-block-title{font-weight:600;font-size:14px;color:var(--muted);margin-bottom:6px}.correction,.vocab{margin-bottom:8px;padding:8px 10px;background:var(--bg);border-radius:8px}.strike{text-decoration:line-through;color:var(--red);margin-right:6px}.arrow{color:var(--muted);margin-right:6px}.fix{color:var(--green);font-weight:500}.reason{color:var(--muted);font-size:13px;margin-top:4px}.prono{padding:6px 10px;background:#fef3c7;border-radius:8px;margin-bottom:6px;font-size:14px}footer{grid-area:footer;background:var(--panel);border-top:1px solid var(--border);padding:12px 20px 16px}.voice-controls{max-width:720px;margin:0 auto;display:flex;align-items:center;gap:12px;flex-wrap:wrap}.mic-btn{width:60px;height:60px;border-radius:50%;border:none;background:var(--primary);color:#fff;font-size:26px;cursor:pointer;transition:transform .1s,background .2s;flex-shrink:0;touch-action:none}.mic-btn:hover{background:var(--primary-dark)}.mic-btn-listening{background:var(--red);transform:scale(1.1);box-shadow:0 0 0 8px #ef44442e}.mic-btn:disabled{opacity:.5;cursor:not-allowed}.stop-btn{width:44px;height:44px;border-radius:50%;border:1px solid var(--border);background:#fff;cursor:pointer}.speaking-dot{display:block;width:12px;height:12px;margin:0 auto;background:var(--green);border-radius:50%;animation:pulse 1s infinite}.text-input-form{display:flex;flex:1;min-width:180px}.text-input{flex:1;padding:10px 14px;border:1px solid var(--border);border-radius:10px 0 0 10px;font-size:16px;outline:none}.text-input:focus{border-color:var(--primary)}.send-btn{padding:0 16px;border:1px solid var(--border);border-left:none;border-radius:0 10px 10px 0;background:var(--primary);color:#fff;font-size:15px;cursor:pointer}.status-line{width:100%;display:flex;align-items:center;gap:10px;color:var(--muted);font-size:13px;margin-top:8px}.status-ok{color:var(--green)}.status-busy{color:var(--amber)}.status-off{color:var(--red)}.listening-hint{color:var(--red);font-weight:500}.speaking-hint{color:var(--green);font-weight:500}.err-hint{color:var(--red);font-weight:500}.asr-toggle{display:inline-flex;align-items:center;gap:4px;cursor:pointer;-webkit-user-select:none;user-select:none}.asr-toggle input{accent-color:var(--primary);margin:0}.tts-select{display:inline-flex;align-items:center;gap:6px}.tts-select select{font-size:12px;padding:2px 4px;border:1px solid #ddd;border-radius:6px;background:#fff;color:#333;cursor:pointer}@media(max-width:860px){.app{grid-template-columns:1fr;grid-template-areas:"header" "chat" "footer"}.feedback-side{display:none}}.header-user{font-size:13px;color:var(--muted);max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.logout-btn{padding:6px 12px;border:1px solid var(--border);border-radius:8px;background:#fff;color:var(--text);font-size:13px;cursor:pointer}.logout-btn:hover{border-color:var(--primary);color:var(--primary)}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.auth-card{width:100%;max-width:400px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:28px;box-shadow:0 8px 30px #1f29370f}.auth-logo{font-size:18px;text-align:center;margin-bottom:6px}.auth-title{font-size:20px;text-align:center;margin-bottom:14px}.auth-sub{color:var(--muted);font-size:14px;text-align:center;margin-bottom:16px;line-height:1.5}.auth-form{display:flex;flex-direction:column;gap:14px}.auth-field{display:flex;flex-direction:column;gap:6px;font-size:14px;color:var(--muted)}.auth-field input{padding:10px 12px;border:1px solid var(--border);border-radius:10px;font-size:15px;outline:none;background:#fff;color:var(--text)}.auth-field input:focus{border-color:var(--primary)}.auth-submit{margin-top:4px;padding:11px;border:none;border-radius:10px;background:var(--primary);color:#fff;font-size:15px;cursor:pointer}.auth-submit:hover{background:var(--primary-dark)}.auth-submit:disabled{opacity:.6;cursor:not-allowed}.auth-err{background:#fef2f2;border:1px solid #fecaca;color:var(--red);padding:8px 10px;border-radius:8px;font-size:14px;line-height:1.5}.auth-ok{background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46;padding:8px 10px;border-radius:8px;font-size:14px;line-height:1.6}.auth-links{display:flex;justify-content:space-between;gap:10px;margin-top:16px;font-size:14px;flex-wrap:wrap}.auth-links a{color:var(--primary);text-decoration:none;cursor:pointer}.auth-links a:hover{text-decoration:underline}.pw-rules{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--muted);background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:10px 12px}.pw-rule.ok{color:var(--green)}.pw-hint{font-size:13px}.pw-hint.ok{color:var(--green)}.pw-hint.err{color:var(--red)}.trial-chip{padding:5px 11px;border-radius:999px;font-size:13px;font-weight:600;white-space:nowrap;background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46}.trial-chip-guest{background:#eef2ff;border-color:#c7d2fe;color:#4338ca}.trial-chip-warn{background:#fef3c7;border-color:#fcd34d;color:#92400e;animation:pulse 1.4s infinite}.trial-chip-expired{background:#fee2e2;border-color:#fecaca;color:#991b1b}.trial-chip-pro{background:#4f46e5;border-color:#4338ca;color:#fff;font-family:inherit;cursor:pointer}.trial-chip-pro:hover{background:#4338ca}.banner{position:sticky;top:-16px;z-index:6;display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:10px 14px;border-radius:10px;margin-bottom:14px;font-size:14px;line-height:1.5}.banner-amber{background:#fffbeb;border:1px solid #fde68a;color:#92400e}.banner-icon{font-size:16px}.banner-text{flex:1;min-width:200px}.banner-btn{padding:6px 12px;border:1px solid #f59e0b;background:#fff;color:#92400e;border-radius:8px;font-size:13px;cursor:pointer}.banner-btn:hover{background:#fef3c7}.banner-btn:disabled{opacity:.6;cursor:not-allowed}.banner-msg{font-weight:600}.guest-gate,.paywall{position:fixed;top:56px;left:0;right:0;bottom:0;z-index:30;display:flex;align-items:center;justify-content:center;padding:24px;overflow-y:auto;background:#f5f7fbe0;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.gate-card,.paywall-card{width:100%;max-width:440px;background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:28px 26px;text-align:center;box-shadow:0 16px 48px #0f172a1f}.gate-badge,.paywall-badge{font-size:40px;margin-bottom:8px}.gate-card h2,.paywall-card h2{font-size:21px;margin-bottom:10px}.gate-card p,.paywall-sub{color:var(--muted);font-size:14px;line-height:1.7;margin-bottom:16px}.gate-actions{display:flex;gap:10px;margin:18px 0 12px}.gate-actions .auth-submit{flex:1}.gate-secondary{flex:1;padding:10px 16px;border:1px solid var(--border);background:#fff;color:var(--text);border-radius:8px;font-size:15px;cursor:pointer}.gate-secondary:hover{border-color:var(--primary);color:var(--primary)}.gate-hint,.paywall-hint{font-size:12px;color:var(--muted);margin-top:14px;line-height:1.6}.paywall-qr{margin:6px 0 16px}.paywall-qr img{width:210px;height:210px;object-fit:contain;border:1px solid var(--border);border-radius:12px;background:#fff;padding:6px}.paywall-steps{text-align:left;margin:0 auto 16px;padding-left:22px;max-width:320px;color:var(--text);font-size:14px;line-height:1.9}.paywall-actions{display:flex;justify-content:center}.paywall-actions .auth-submit{width:100%}.paywall-subscribe{margin-bottom:4px}.paywall-stripe-btn{width:100%;background:#4f46e5}.paywall-stripe-btn:hover{background:#4338ca}.paywall-sub-hint{font-size:12px;color:var(--muted);line-height:1.6;margin:8px 0 0}.paywall-divider{display:flex;align-items:center;gap:10px;margin:14px 0;color:var(--muted);font-size:12px}.paywall-divider:before,.paywall-divider:after{content:"";flex:1;border-top:1px solid var(--border)}@media(max-width:860px){.trial-chip{font-size:12px;padding:4px 8px}.header-user{display:none}}