:root{--bg:#0f1420;--surface:#1a2232;--surface-2:#232d42;--text:#e8ecf4;--text-dim:#9aa5bb;--accent:#4f8cff;--accent-soft:#4f8cff2e;--user-bubble:#2c5cc5;--correction-bg:#ffc4571f;--correction-border:#f0b13e;--danger:#e05d5d;--radius:14px;font-family:Segoe UI,system-ui,-apple-system,sans-serif}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{background:var(--bg);color:var(--text)}.app{flex-direction:column;max-width:640px;height:100%;margin:0 auto;display:flex}.app-header{border-bottom:1px solid var(--surface-2);justify-content:space-between;align-items:center;padding:14px 18px;display:flex}.app-header h1{font-size:1.15rem}.header-actions{gap:8px;display:flex}.button-icon{background:var(--surface);border:1px solid var(--surface-2);cursor:pointer;border-radius:10px;padding:6px 10px;font-size:1.1rem;transition:background .15s}.button-icon:hover{background:var(--surface-2)}.app-main,.chat-view{flex-direction:column;flex:1;display:flex;overflow:hidden}.chat-messages{flex-direction:column;flex:1;gap:12px;padding:18px;display:flex;overflow-y:auto}.chat-empty{text-align:center;color:var(--text-dim);flex-direction:column;gap:8px;margin:auto;font-size:1.05rem;display:flex}.chat-empty-hint{font-size:.9rem}.message{display:flex}.message-user{justify-content:flex-end}.message-tutor{justify-content:flex-start}.message-bubble{border-radius:var(--radius);background:var(--surface);max-width:82%;padding:10px 14px;line-height:1.45}.message-user .message-bubble{background:var(--user-bubble);border-bottom-right-radius:4px}.message-tutor .message-bubble{border-bottom-left-radius:4px}.message-interim{opacity:.6;font-style:italic}.message-correction{background:var(--correction-bg);border-left:3px solid var(--correction-border);border-radius:6px;margin-top:10px;padding:8px 10px;font-size:.88rem}.correction-label{color:var(--correction-border);margin-bottom:3px;font-size:.78rem;font-weight:600;display:block}.replay-button{border:1px solid var(--surface-2);color:var(--text-dim);cursor:pointer;background:0 0;border-radius:8px;margin-top:8px;padding:3px 9px;font-size:.78rem}.replay-button:hover{color:var(--text);border-color:var(--text-dim)}.mic-area{border-top:1px solid var(--surface-2);flex-direction:column;align-items:center;gap:8px;padding:16px 0 24px;display:flex}.mic-button{cursor:pointer;background:var(--accent);border:none;border-radius:50%;justify-content:center;align-items:center;width:74px;height:74px;font-size:1.9rem;transition:transform .15s,background .2s,box-shadow .2s;display:flex}.mic-button:hover:not(:disabled){transform:scale(1.06)}.mic-button:disabled{cursor:default;background:var(--surface-2)}.mic-listening{background:var(--danger);animation:1.4s infinite pulse}@keyframes pulse{0%{box-shadow:0 0 #e05d5d80}70%{box-shadow:0 0 0 22px #e05d5d00}to{box-shadow:0 0 #e05d5d00}}.mic-label{color:var(--text-dim);font-size:.85rem}.spinner{border:3px solid var(--text-dim);border-top-color:#0000;border-radius:50%;width:26px;height:26px;animation:.8s linear infinite spin;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.error-banner{border:1px solid var(--danger);color:#f2b8b8;background:#e05d5d26;border-radius:10px;margin:0 18px 10px;padding:10px 14px;font-size:.9rem}.settings-panel{flex-direction:column;gap:18px;width:100%;max-width:440px;margin:auto;padding:28px 22px;display:flex;overflow-y:auto}.settings-panel h2{font-size:1.35rem}.settings-intro{color:var(--text-dim);font-size:.93rem;line-height:1.5}.settings-intro a{color:var(--accent)}.field{flex-direction:column;gap:7px;font-size:.9rem;display:flex}.field>span{color:var(--text-dim);font-weight:600}.field input[type=text],.field input[type=password],.field select{background:var(--surface);border:1px solid var(--surface-2);color:var(--text);border-radius:10px;padding:10px 12px;font-size:.95rem}.field input:focus,.field select:focus{outline:2px solid var(--accent);border-color:#0000}.level-options{gap:8px;display:flex}.level-option{border:1px solid var(--surface-2);background:var(--surface);color:var(--text-dim);cursor:pointer;border-radius:10px;flex:1;padding:9px 0;font-size:.88rem}.level-option.selected{background:var(--accent-soft);border-color:var(--accent);color:var(--text);font-weight:600}.settings-actions{justify-content:flex-end;gap:10px;margin-top:6px;display:flex}.button-primary{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;padding:11px 20px;font-size:.95rem;font-weight:600}.button-primary:disabled{opacity:.45;cursor:default}.button-secondary{background:var(--surface);border:1px solid var(--surface-2);color:var(--text);cursor:pointer;border-radius:10px;padding:11px 20px;font-size:.95rem}.unsupported{text-align:center;color:var(--text-dim);flex-direction:column;gap:12px;max-width:420px;margin:auto;padding:24px;line-height:1.5;display:flex}.unsupported h2{color:var(--text)}.unsupported code{background:var(--surface);border-radius:6px;padding:1px 6px;font-size:.88em}.unsupported a{color:var(--accent)}.env-snippet{background:var(--surface);border:1px solid var(--surface-2);text-align:left;border-radius:10px;padding:12px 16px;font-size:.9rem;overflow-x:auto}