:root{--bg: #f5f6fa;--bg-board: #f7f8fb;--bg-card: #ffffff;--bg-card-hover: #f7f8fb;--bg-panel: #ffffff;--border: #e5e6eb;--border-light: #d8d9df;--text: #1d1d1f;--text-dim: #4a4a52;--text-faint: #86868b;--accent: #5b6cff;--accent-deep: #4754e6;--accent-light: #eef0ff;--accent-dim: rgba(91, 108, 255, .08);--accent-glow: rgba(91, 108, 255, .16);--mint: #2bb673;--mint-dim: rgba(43, 182, 115, .1);--butter: #e8a33d;--butter-dim: rgba(232, 163, 61, .1);--lavender: #5b6cff;--lavender-dim: rgba(91, 108, 255, .1);--berry: #e0584f;--berry-dim: rgba(224, 88, 79, .08);--sky: #5b8def;--sky-dim: rgba(91, 141, 239, .1);--agent-gradient: linear-gradient(135deg, #5b6cff, #4754e6);--card-shadow: 0 6px 20px rgba(20, 22, 40, .06), 0 2px 6px rgba(20, 22, 40, .04);--card-shadow-hover: 0 14px 40px rgba(20, 22, 40, .08), 0 6px 16px rgba(20, 22, 40, .05);--radius: 28px;--radius-sm: 16px;--radius-xs: 10px;--sidebar-w: 248px;--panel-w: 376px;--ease-bounce: cubic-bezier(.34, 1.56, .64, 1)}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{width:100%;height:100%}body{font-family:Nunito,-apple-system,Noto Sans SC,sans-serif;background:var(--bg);color:var(--text);overflow:hidden;min-height:100%;-webkit-font-smoothing:antialiased}body:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse 700px 500px at 20% 10%,rgba(91,108,255,.03),transparent),radial-gradient(ellipse 600px 400px at 90% 90%,rgba(91,108,255,.02),transparent);pointer-events:none;z-index:0}#root{height:100%;min-height:0;position:relative;z-index:1}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--accent-light);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--accent-dim)}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}button:disabled{cursor:not-allowed;opacity:.5}input,textarea{font-family:inherit;border:none;outline:none;background:none;color:inherit}@keyframes cardSlideIn{0%{opacity:0;transform:translateY(16px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes msgIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes blink{0%,to{opacity:.3}50%{opacity:1}}@keyframes pulse-rec{0%,to{box-shadow:0 0 #e0584f66}50%{box-shadow:0 0 0 10px #e0584f00}}@keyframes spin{to{transform:rotate(360deg)}}.fade-in{animation:msgIn .3s 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var(--accent-glow);color:#fff;font-family:Fredoka,Nunito,sans-serif;font-size:1.75rem;font-weight:700}.login-card h1{font-size:1.6rem;line-height:1.25;letter-spacing:-.02em}.login-card>p{margin-top:10px;color:var(--text-faint);font-size:.94rem}.login-form{margin-top:32px;display:grid;gap:10px;text-align:left}.login-form label{margin-top:6px;color:var(--text-dim);font-size:.8rem;font-weight:700}.login-form input{width:100%;height:52px;padding:0 16px;border:1px solid var(--border-light);border-radius:14px;background:#fafbff;font-size:1rem;transition:border-color .18s ease,box-shadow .18s ease,background .18s ease}.login-form input:focus{border-color:var(--accent);background:#fff;box-shadow:0 0 0 4px var(--accent-dim)}.login-error{margin-top:4px;padding:10px 12px;border-radius:10px;background:var(--berry-dim);color:var(--berry);font-size:.8rem;line-height:1.45;text-align:center}.login-submit{width:100%;height:52px;margin-top:12px;border-radius:14px;background:var(--agent-gradient);box-shadow:0 10px 24px var(--accent-glow);color:#fff;font-size:.95rem;font-weight:700;transition:transform .18s ease,box-shadow .18s ease}.login-submit:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 14px 30px var(--accent-glow)}.login-loading{display:grid;justify-items:center;gap:8px}.login-loading .login-brand{margin-bottom:12px}@media (max-width: 520px){.login-page{padding:18px}.login-card{padding:34px 24px 30px;border-radius:22px}}.workspace{display:grid;grid-template-columns:var(--sidebar-w) 1fr var(--panel-w);height:100vh;height:100dvh;min-height:0;overflow:hidden}.workspace.sidebar-collapsed{grid-template-columns:68px 1fr var(--panel-w)}.workspace>*{min-width:0;min-height:0}.sidebar{background:var(--bg-panel);border-right:1px solid 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6px}.module-item{display:flex;align-items:center;gap:10px;width:100%;padding:10px;border-radius:var(--radius-sm);text-align:left;transition:background .18s ease}.module-item:hover:not(:disabled){background:var(--bg-card-hover)}.module-item.active{background:var(--accent-dim)}.module-item:disabled{opacity:.42}.module-icon{width:26px;height:26px;border-radius:8px;background:var(--accent-light);display:flex;align-items:center;justify-content:center;font-size:.85rem;flex-shrink:0}.module-item.active .module-icon{background:var(--agent-gradient);color:#fff}.module-name{font-size:.86rem;font-weight:600}.module-item.active .module-name{color:var(--accent-deep)}.module-badge{margin-left:auto;font-size:.64rem;color:var(--text-faint);font-weight:600}.session-list{flex:1;overflow-y:auto;padding:0 12px 12px}.session-item{width:100%;padding:9px 10px;border-radius:var(--radius-sm);text-align:left;transition:background .18s 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.module-badge,.workspace.sidebar-collapsed .session-title,.workspace.sidebar-collapsed .session-meta,.workspace.sidebar-collapsed .sidebar-footer>span,.workspace.sidebar-collapsed .ws-status{display:none}.workspace.sidebar-collapsed .sidebar-section,.workspace.sidebar-collapsed .session-list{padding-inline:9px}.workspace.sidebar-collapsed .module-item{justify-content:center;padding-inline:8px}.workspace.sidebar-collapsed .session-item{height:9px;margin:5px 0;padding:0;border-radius:999px;background:var(--border)}.workspace.sidebar-collapsed .session-item.active{background:var(--accent)}.workspace.sidebar-collapsed .new-session-full{display:none}.workspace.sidebar-collapsed .new-session-short{display:inline;font-size:1.15rem}.workspace.sidebar-collapsed .sidebar-footer{justify-content:center;padding-inline:8px}.tts-setting{padding:10px 20px;border-top:1px solid var(--border);flex-shrink:0}.tts-toggle{display:flex;gap:6px;margin-top:6px}.tts-option{flex:1;padding:6px 0;border-radius:var(--radius-sm);border:1px solid var(--border-light);background:transparent;color:var(--text-dim);font-size:.72rem;font-weight:600;cursor:pointer;transition:all .18s ease}.tts-option:hover{border-color:var(--accent);color:var(--accent)}.tts-option.active{border-color:var(--accent);background:var(--accent-dim);color:var(--accent)}.tts-hint{margin-top:5px;font-size:.66rem;color:var(--text-faint)}.sidebar-footer{padding:12px 20px;border-top:1px solid var(--border);font-size:.72rem;color:var(--text-faint);display:flex;align-items:center;justify-content:space-between;flex-shrink:0}.sidebar-footer-right{display:flex;align-items:center;gap:8px}.settings-logout{width:100%;padding:10px 14px;border:1px solid var(--border-light);border-radius:var(--radius-sm);color:var(--berry);font-size:.8rem;font-weight:700}.settings-logout:hover{border-color:var(--berry);background:var(--berry-dim)}.ws-status{display:flex;align-items:center;gap:5px;font-size:.68rem}.ws-status .dot{width:6px;height:6px;border-radius:50%;background:var(--text-faint)}.ws-status.connected .dot{background:var(--mint)}.ws-status.disconnected .dot{background:var(--berry)}.stage{display:flex;flex-direction:column;min-width:0;min-height:0;overflow:hidden;background:var(--bg-board)}.stage-header{height:52px;display:flex;align-items:center;gap:16px;padding:0 24px;border-bottom:1px solid var(--border);background:#ffffffb8;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);flex-shrink:0;position:relative;z-index:10}.stage-title{font-family:Fredoka,sans-serif;font-size:.9rem;font-weight:600}.stage-round{margin-left:auto;font-size:.74rem;font-weight:700;color:var(--accent);background:var(--accent-dim);padding:3px 12px;border-radius:14px}.stage-body{flex:1;min-height:0;display:flex;flex-direction:column;overflow:hidden}.card-area{flex-shrink:0;padding:18px 28px 10px;border-bottom:1px solid var(--border);background:var(--bg-board);max-height:58%;overflow-y:auto}.task-panel{background:var(--bg-panel);border-left:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden;min-height:0}.task-header{padding:18px 20px 12px;flex-shrink:0}.task-title{font-family:Fredoka,sans-serif;font-size:.9rem;font-weight:600;margin-bottom:4px}.task-date{font-size:.7rem;color:var(--text-faint)}@media (max-width: 1200px){.workspace{grid-template-columns:220px 1fr 320px}}@media (max-width: 900px){.workspace{grid-template-columns:1fr;grid-template-rows:auto 1fr auto}.workspace.sidebar-collapsed{grid-template-columns:1fr}.sidebar-collapse-btn{display:none}.sidebar{flex-direction:row;border-right:none;border-bottom:1px solid var(--border);overflow-x:auto}.session-list{display:none}.task-panel{border-left:none;border-top:1px solid var(--border);max-height:240px}}.today-task{padding:4px 8px 8px;border-top:1px solid var(--border);margin-top:8px}.today-task .task-date{font-size:.66rem;color:var(--text-faint);font-weight:400;text-transform:none;letter-spacing:0}.today-task .progress-bar{height:14px;margin:4px 8px 8px}.today-task .progress-stats{display:flex;gap:6px;padding:0 8px}.today-task .stat-box{flex:1;padding:6px 4px}.today-task .stat-num{font-size:.85rem}.today-task .stat-label{font-size:.62rem}.today-task .task-list{padding:6px 8px 0}.today-task .star-grid{grid-template-columns:repeat(auto-fill,minmax(16px,1fr))}.today-task .mastery-overview{margin:8px}.settings-btn{width:26px;height:26px;border-radius:6px;border:1px solid var(--border);background:transparent;color:var(--text-dim);font-size:.9rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .18s ease;flex-shrink:0}.settings-btn:hover{color:var(--accent);border-color:var(--accent)}.settings-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000004d;z-index:1100;display:flex;align-items:center;justify-content:center}.settings-panel{width:320px;max-width:90vw;background:var(--bg-panel);border-radius:var(--radius);box-shadow:var(--card-shadow);overflow:hidden}.settings-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.settings-title{font-family:Fredoka,sans-serif;font-weight:600;font-size:1rem}.settings-close{background:none;border:none;font-size:1rem;color:var(--text-faint);cursor:pointer;padding:4px}.settings-close:hover{color:var(--text)}.settings-body{padding:16px 20px 20px}.settings-group{margin-bottom:16px}.settings-label{font-size:.8rem;font-weight:600;color:var(--text);margin-bottom:4px}.settings-desc{font-size:.7rem;color:var(--text-faint);margin-bottom:10px}.profile-settings{padding-bottom:16px;border-bottom:1px solid var(--border)}.profile-mode-hint{margin-top:8px;padding:8px 10px;border-radius:8px;font-size:.7rem;font-weight:600}.profile-mode-hint.test{color:#9a5a00;background:#fff3d6}.profile-mode-hint.feifei{color:#24633d;background:#e8f8ee}.workspace.test-mode{box-shadow:inset 0 0 0 3px #f2a93b}.test-mode-banner{position:fixed;top:8px;left:50%;transform:translate(-50%);z-index:1000;padding:6px 14px;border-radius:999px;background:#fff3d6;border:1px solid #f2a93b;color:#875000;font-size:.72rem;font-weight:700;box-shadow:0 4px 14px #87500024;pointer-events:none}.card-view{padding:28px 32px;min-height:100%;display:flex;flex-direction:column}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:26px 28px;box-shadow:var(--card-shadow);animation:cardSlideIn .5s var(--ease-bounce) backwards;transition:box-shadow .35s var(--ease-bounce)}.card:hover{box-shadow:var(--card-shadow-hover)}.card-focus{max-width:620px;width:100%;margin:0 auto}.card-type-badge{display:inline-block;padding:3px 11px;border-radius:20px;font-size:.66rem;font-weight:800;letter-spacing:.04em;margin-bottom:14px}.badge-see{background:var(--sky-dim);color:var(--sky)}.badge-hear{background:var(--lavender-dim);color:var(--lavender)}.badge-speak{background:var(--mint-dim);color:var(--mint)}.badge-spell{background:var(--butter-dim);color:var(--butter)}.badge-info{background:var(--accent-dim);color:var(--accent)}.card-question{font-size:.92rem;font-weight:700;color:var(--text-dim);margin-bottom:18px}.word-display{font-family:Fredoka,sans-serif;font-size:2.6rem;font-weight:600;text-align:center;letter-spacing:.01em;margin:8px 0 6px}.word-emoji{font-size:2.4rem;text-align:center;margin-bottom:6px}.word-ipa{text-align:center;font-size:1rem;color:var(--accent);font-weight:600;margin-bottom:18px}.word-header{display:flex;align-items:center;justify-content:center;gap:12px;margin:8px 0 6px}.word-title{font-family:Fredoka,sans-serif;font-size:2.4rem;font-weight:600;letter-spacing:.01em;cursor:pointer}.word-play-btn{width:40px;height:40px;border-radius:50%;border:none;background:var(--accent-dim);font-size:1.1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .18s ease}.word-play-btn:hover{background:var(--accent);transform:scale(1.08)}.word-play-btn.playing{background:var(--accent)}.word-engine-toggle{flex:0 0 auto;min-width:52px;height:34px;padding:0 9px;border:1px solid var(--border-light);border-radius:999px;background:var(--bg-card);color:var(--text-faint);font-size:.68rem;font-weight:800;cursor:pointer;transition:border-color .18s ease,color .18s ease,background .18s ease}.word-engine-toggle.gtts{color:var(--accent);border-color:var(--accent);background:var(--accent-dim)}.word-engine-toggle.edge{color:var(--butter);border-color:var(--butter);background:var(--butter-dim)}.word-engine-toggle:hover{transform:translateY(-1px)}.whole-ipa{text-align:center;font-size:1rem;font-weight:600;color:var(--accent);margin-bottom:6px}.whole-ipa.vocab-ipa-missing{color:var(--text-faint)}.word-meaning{text-align:center;font-size:.95rem;color:var(--text-dim);margin-bottom:16px}.memory-card{display:inline-block;margin:18px 0 4px;padding:14px 22px;border-radius:var(--radius-sm);border:1px solid var(--lavender);background:var(--lavender-dim);text-align:left;box-shadow:0 2px 0 var(--border)}.memory-card-word{font-family:Fredoka,sans-serif;font-size:1.6rem;font-weight:800;color:var(--text);letter-spacing:.02em}.memory-card-ipa{margin-top:4px;font-size:.85rem;font-weight:600;color:var(--lavender);font-style:italic}.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:22px}.quiz-option{display:flex;align-items:center;justify-content:center;gap:8px;padding:16px 18px;border-radius:var(--radius-sm);border:2px solid var(--border);background:var(--bg-card);font-size:.95rem;font-weight:600;text-align:center;transition:all .2s var(--ease-bounce);-webkit-appearance:none;-moz-appearance:none;appearance:none;-webkit-tap-highlight-color:transparent;outline:none;box-shadow:none}.quiz-option:focus,.quiz-option:focus-visible{outline:none!important;box-shadow:none!important}.quiz-option:hover:not(:disabled){border-color:var(--accent);background:var(--accent-dim);transform:translateY(-2px)}.quiz-option.correct{border-color:var(--mint);background:var(--mint-dim)}.quiz-option.wrong{border-color:var(--berry);background:var(--berry-dim)}.option-key{display:none}.option-text{font-weight:600}.audio-btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;padding:16px;border-radius:var(--radius-sm);background:var(--accent-dim);color:var(--accent-deep);font-size:.95rem;font-weight:700;transition:all .2s var(--ease-bounce);margin-bottom:6px}.audio-btn:hover{background:var(--accent-light);transform:scale(1.01)}.audio-btn.playing{animation:pulse-rec 1.4s infinite}.word-audio-control{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:8px;margin-bottom:6px}.word-audio-control .audio-btn{margin-bottom:0}.spell-input{width:100%;padding:16px 20px;border-radius:var(--radius-sm);border:2px solid var(--border);background:var(--bg);font-family:Fredoka,sans-serif;font-size:1.5rem;text-align:center;letter-spacing:.16em;transition:border-color .2s ease}.spell-input:focus{border-color:var(--accent);background:var(--bg-card)}.spell-hint{text-align:center;font-size:.75rem;color:var(--text-faint);margin-top:8px}.spell-slots{display:flex;flex-wrap:nowrap;gap:8px;justify-content:center;align-items:center;width:100%;min-width:0;margin-top:4px}.spell-entry{position:relative;cursor:text}.spell-native-input{position:absolute;left:50%;bottom:0;z-index:2;width:1px;height:1px;opacity:0;pointer-events:none;font-size:16px;caret-color:transparent}.spell-slot{flex:0 1 44px;min-width:28px;height:52px;border-radius:10px;border:2px solid var(--border);background:var(--bg);font-family:Fredoka,sans-serif;font-size:1.5rem;font-weight:700;text-align:center;display:flex;align-items:center;justify-content:center;transition:border-color .2s ease,background .2s ease}.spell-slots.compact{gap:5px}.spell-slots.compact .spell-slot,.spell-slots.compact .spell-punct{flex-basis:36px;min-width:25px;height:46px;border-radius:8px;font-size:1.25rem}.spell-slots.compact .spell-space{width:12px}.spell-slots.dense{gap:3px}.spell-slots.dense .spell-slot,.spell-slots.dense .spell-punct{flex-basis:30px;min-width:20px;height:40px;font-size:1.05rem}.spell-slots.dense .spell-space{width:8px}.spell-slot.spell-slot-active{border-color:var(--accent);background:var(--bg-card)}.spell-slot.spell-slot-wrong{color:var(--berry);-webkit-text-fill-color:var(--berry);border-color:var(--berry);background:var(--berry-dim);opacity:1}.spell-space{width:18px;flex-shrink:0}.spell-punct{flex:0 1 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