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100%);flex-direction:column;justify-content:center;align-items:center;gap:16px;padding:24px;display:flex;position:fixed;inset:0}.voice-close{background:var(--card);width:44px;height:44px;box-shadow:var(--shadow);cursor:pointer;color:var(--text);border:none;border-radius:14px;justify-content:center;align-items:center;display:flex;position:absolute;top:16px;right:16px}.voice-mascot{font-size:80px}.voice-status{color:var(--primary-dark);text-align:center;font-size:20px;font-weight:600}.voice-subject{color:var(--primary-dark);background:#fff3e0;border-radius:999px;padding:4px 14px;font-size:14px}.voice-bubbles{flex-direction:column;gap:10px;width:100%;max-width:560px;min-height:120px;display:flex}.voice-bubble{box-shadow:var(--shadow);border-radius:16px;padding:12px 16px;font-size:18px;line-height:1.5}.user-bubble{background:var(--primary);color:#fff;align-self:flex-end;max-width:80%}.ai-bubble{background:var(--card);color:var(--text);align-self:flex-start;max-width:85%}.voice-controls{align-items:center;gap:16px;margin-top:8px;display:flex}.voice-mic{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:50%;justify-content:center;align-items:center;width:76px;height:76px;display:flex;box-shadow:0 6px 20px #f0880066}.voice-mic.rec{background:var(--bad);animation:1s infinite pulse}.voice-mic:disabled{background:#ccc}.voice-bargein{border:2px solid var(--accent);color:var(--accent);cursor:pointer;background:#e7f0ff;border-radius:999px;padding:10px 18px;font-size:16px;font-weight:700}.voice-replay{background:var(--card);width:48px;height:48px;color:var(--primary-dark);cursor:pointer;box-shadow:var(--shadow);border:none;border-radius:50%;justify-content:center;align-items:center;display:flex}.voice-hint{color:var(--text-soft);text-align:center;margin-top:8px;font-size:13px}.settings-modal{max-width:460px}.privacy-note{color:var(--accent);background:#e7f0ff;border-radius:10px;margin-bottom:14px;padding:10px 14px;font-size:14px;line-height:1.5}.setting-row{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:10px;padding:10px 4px;font-size:16px;display:flex}.setting-row span{flex:1}.setting-row input[type=checkbox]{width:22px;height:22px;accent-color:var(--primary);cursor:pointer}.setting-row select{border:1px solid var(--border);border-radius:8px;padding:6px 10px;font-size:15px}.setting-group{border-left:3px solid var(--border);margin:4px 0 8px;padding-left:10px}.setting-group.disabled{opacity:.45}.setting-sep{border:none;border-top:1px solid var(--border);margin:10px 0}.setting-section-title{color:var(--text);margin:4px 0 8px;font-size:15px;font-weight:700}.subj-grid{grid-template-columns:1fr 1fr;gap:6px;display:grid}.subj-toggle{cursor:pointer;border-radius:10px;align-items:center;gap:8px;padding:8px 10px;font-size:15px;display:flex}.subj-toggle:hover{background:var(--bg-soft)}.subj-toggle.on{color:var(--primary-dark);background:#fff3e0;font-weight:600}.subj-toggle-emoji{font-size:20px}.subj-toggle-check{color:var(--primary-dark);opacity:0;transition:opacity .15s}.subj-toggle-check.show{opacity:1}.subj-toggle input{width:18px;height:18px;accent-color:var(--primary);cursor:pointer}.subject-settings-modal{max-width:460px}.subject-settings-modal .subj-grid{grid-template-columns:1fr 1fr}.posture-reminder{z-index:45;background:var(--card);border:2px solid var(--primary);color:var(--text);border-radius:12px;align-items:center;gap:8px;max-width:60%;padding:6px 14px;font-size:15px;font-weight:600;animation:.5s prShake;display:flex;position:absolute;top:2px;left:50%;transform:translate(-50%);box-shadow:0 6px 18px #f0880040}@keyframes prShake{0%,to{transform:translate(-50%)rotate(0)}25%{transform:translate(-52%)rotate(-1deg)}75%{transform:translate(-48%)rotate(1deg)}}.pr-emoji{font-size:20px}.kind-head_down{border-color:var(--warn)}.kind-too_close{border-color:var(--bad)}.kind-tilted{border-color:var(--accent)}.kind-off_center{border-color:var(--primary)}.kind-rest{border-color:var(--accent)}.cam-preview{opacity:0;pointer-events:none;z-index:-1;background:0 0;border:0;width:2px;height:2px;position:fixed;top:-200px;left:-200px}.avatar-grid{flex-wrap:wrap;gap:10px;margin-top:8px;display:flex}.avatar-thumb{border:3px solid var(--border);cursor:pointer;object-fit:cover;border-radius:50%;width:72px;height:72px;transition:transform .15s,border-color .15s}.avatar-thumb:hover{transform:scale(1.06)}.avatar-thumb-selected{border-color:var(--primary);transform:scale(1.05);box-shadow:0 0 0 3px #ff9f4359}.avatar-select{align-items:center;gap:10px;display:flex}.avatar-select-preview{object-fit:cover;border:2px solid var(--border);border-radius:50%;flex-shrink:0;width:40px;height:40px}.avatar-select select{flex:1}.message-user .avatar{background:var(--bg-soft);padding:2px}.message-user .avatar-user-img{object-fit:cover;border-radius:50%;width:40px;height:40px}.mascot{display:inline-block}.mascot img{width:100%;height:100%;display:block}.mascot-talking .mascot img{filter:drop-shadow(0 4px 8px #f0880066);animation:1s infinite bounce}.welcome-slogan1{color:var(--primary);letter-spacing:1px;margin-bottom:4px;font-size:14px;font-weight:600}.auth-tagline{color:var(--text-soft);margin:0;font-size:15px}.auth-slogan{color:var(--primary-dark);margin:4px 0 0;font-size:15px;font-weight:600}.auth-lang-wrap{z-index:5;position:absolute;top:18px;right:20px}.auth-lang-toggle{display:none}.lang-dropdown{margin:0 4px;display:inline-block;position:relative}.lang-dropdown-btn{border:1px solid var(--border);background:var(--card);color:var(--accent);cursor:pointer;border-radius:999px;align-items:center;gap:4px;height:32px;padding:4px 10px;font-size:14px;font-weight:700;display:inline-flex}.lang-dropdown-btn:hover{border-color:var(--accent)}.lang-dropdown-menu{z-index:60;background:var(--card);border:1px solid var(--border);border-radius:0 0 12px 12px;min-width:140px;max-height:60vh;margin:0;padding:4px;list-style:none;position:absolute;top:100%;right:0;overflow-y:auto;box-shadow:0 6px 18px #0000001f}.lang-dropdown-menu li{cursor:pointer;color:var(--text);border-radius:8px;padding:8px 12px;font-size:15px}.lang-dropdown-menu li:hover{background:var(--bg-soft)}.lang-dropdown-menu li.active{color:var(--primary-dark);background:#fff3e0;font-weight:600}.chev{transition:transform .18s}.chev.open{transform:rotate(180deg)}.lang-select{border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:8px;padding:4px 8px;font-size:14px}.lang-tab{display:none}.style-clean{--bg:#f5f7fa;--bg-soft:#eef2f7;--primary:#4f7cff;--primary-dark:#3b66d9;--accent:#6c7a8f;--text:#2b3440;--text-soft:#6c7a8f;--card:#fff;--border:#e2e8f0;--shadow:0 2px 8px #3c507814}.style-clean body,.style-clean .app{background:var(--bg)}.style-clean .auth-screen,.style-clean .voice-mode{background:linear-gradient(135deg,#f5f7fa 0%,#e7ecf5 100%)}.style-clean .welcome-title,.style-clean .chat-brand{color:var(--primary-dark)}.style-clean .send-btn{background:var(--primary)}.style-clean .subject-card:hover{border-color:var(--primary)}.style-clean .modal-save,.style-clean .auth-submit,.style-clean .auth-tabs button.active,.style-clean .top-tab.active{background:var(--primary)}.style-clean .stat-tile{background:#eef2f7}.style-clean .stat-num{color:var(--primary-dark)}.style-clean .avatar-assistant{background:#e7ecf5}.style-clean .message-content,.style-clean .subject-card,.style-clean .parent-card,.style-clean .auth-card{border-radius:12px}.style-clean .grade-card{background:#fafbfd}.examples-panel{max-width:760px;margin:0 auto;padding:0 16px 24px}.examples-title{color:var(--text-soft);align-items:center;gap:6px;margin-bottom:10px;font-size:13px;font-weight:700;display:flex}.examples-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px;display:grid}.example-card{text-align:left;cursor:pointer;background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:12px;padding:12px 14px;transition:transform .14s,border-color .14s,box-shadow .14s}.example-card:hover{border-color:var(--primary);box-shadow:0 6px 18px var(--primary)22;transform:translateY(-2px)}.example-card-title{color:var(--text);margin-bottom:3px;font-size:15px;font-weight:700}.example-card-desc{color:var(--text-soft);font-size:12px;line-height:1.5}.example-card-tags{flex-wrap:wrap;gap:4px;margin-top:8px;display:flex}.example-card-tag{color:var(--primary);background:var(--bg-soft);border:1px solid var(--border);border-radius:999px;padding:1px 8px;font-size:11px}.sidebar-wallet{background:linear-gradient(135deg, var(--primary)14, transparent);border:1px solid var(--primary)33;border-radius:999px;flex-shrink:0;align-items:center;gap:6px;margin-left:4px;padding:2px 8px;display:inline-flex}.sidebar-wallet-item{color:var(--primary-dark);font-variant-numeric:tabular-nums;align-items:center;gap:3px;font-size:17px;font-weight:800;line-height:1;display:inline-flex}.sidebar-wallet-icon{color:var(--primary);flex-shrink:0}