:root{--bg: #0f1020;--panel: #1b1d3a;--panel-2: #242750;--primary: #5b4bd6;--primary-2: #8be9ff;--ok: #35c56f;--warn: #ff6b6b;--text: #f4f5ff;--muted: #a9abd0;--gold: #ffd76a;--radius: 20px}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{margin:0;height:100%}body{background:radial-gradient(1200px 600px at 50% -10%,#2a2456 0%,var(--bg) 60%);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:18px;line-height:1.5}.app{max-width:520px;margin:0 auto;min-height:100%;display:flex;flex-direction:column}.content{flex:1;padding:16px 16px 112px;overflow-y:auto}h1{font-size:26px;margin:6px 0}h2{font-size:22px;margin:10px 0}h3{font-size:18px;margin:8px 0}.muted{color:var(--muted);font-size:15px}.small{font-size:13px}.center{text-align:center}.spacer{flex:1}.btn{min-height:3.5rem;padding:12px 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var(--panel-2);border-radius:24px;min-height:240px;padding:22px;display:grid;place-items:center;cursor:pointer}.flip-card.flipped{background:var(--panel-2)}.flip-face{text-align:center;width:100%}.big-en{font-size:40px;font-weight:800;color:var(--primary-2)}.big-cn{font-size:30px;font-weight:700}.pos{color:var(--gold);font-size:16px;margin-left:8px}.hint-tap{margin-top:24px;color:var(--muted);font-size:14px}.extra{margin-top:8px;font-size:16px;color:var(--text)}.example{margin-top:12px;padding:10px;background:#00000040;border-radius:12px;font-size:16px}.example-cn{color:var(--muted);font-size:14px}.grade-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:16px}.grade.forgot{background:var(--warn)}.grade.fuzzy{background:var(--gold);color:#3a2f00}.grade.remember{background:var(--ok)}.q-prompt{text-align:center;margin:14px 0}.word-line{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap}.cloze-sentence{font-size:22px;line-height:1.7}.q-hint{color:var(--muted);margin-top:6px}.audio-prompt{display:flex;flex-direction:column;align-items:center;gap:12px}.options{display:grid;gap:12px;margin-top:12px}.opt{display:flex;align-items:center;gap:12px;text-align:left;background:var(--panel)}.opt-key{width:34px;height:34px;border-radius:10px;background:var(--panel-2);display:grid;place-items:center;color:var(--primary-2);font-weight:800}.opt-correct{background:#35c56f40;border:2px solid var(--ok)}.opt-wrong{background:#ff6b6b38;border:2px solid var(--warn)}.answer-input{width:100%;min-height:56px;border-radius:16px;border:2px solid var(--panel-2);background:var(--panel);color:var(--text);font-size:22px;text-align:center;padding:8px;margin:10px 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input[type=range]{width:100%}.switch{display:flex;align-items:center;gap:10px;margin:12px 0}.switch input{width:22px;height:22px}.tabbar{position:fixed;bottom:0;left:0;right:0;max-width:520px;margin:0 auto;display:grid;grid-template-columns:repeat(5,1fr);background:#14152df7;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-top:1px solid var(--panel-2);padding-bottom:env(safe-area-inset-bottom)}.tab{background:none;border:none;color:var(--muted);padding:8px 0;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:2px}.tab.active{color:var(--primary-2)}.tab-emoji{font-size:20px}.tab-label{font-size:11px}.panel{background:var(--panel);border:1px solid var(--panel-2);border-radius:var(--radius);padding:20px;margin:16px 0}.grammar-block{margin-top:10px;width:100%;text-align:left}.formula{background:#8be9ff1f;border-left:4px solid var(--primary-2);border-radius:10px;padding:8px 10px;margin-bottom:8px;font-size:16px}.page-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.speak{font-size:15px;min-height:2.5rem}.ov-section{margin:18px 0}.ov-title{display:flex;align-items:center;gap:8px;border-left:4px solid var(--primary);padding-left:10px;margin:14px 0 10px}.ov-list{display:grid;gap:10px}.ov-card{background:var(--panel);border:1px solid var(--panel-2);border-radius:16px;padding:12px 14px}.ov-head{display:flex;align-items:baseline;gap:8px}.ov-en{font-size:22px;font-weight:700;color:var(--primary-2)}.ov-cn{font-size:18px;margin-top:2px}.ov-note{color:var(--muted);font-size:15px;margin-top:6px}.ov-level{margin-left:auto;font-size:18px}.mode-tabs{display:flex;gap:8px;justify-content:center;margin:10px 0}.tab-btn{background:var(--panel);border:2px solid var(--panel-2);color:var(--muted);border-radius:999px;padding:8px 14px;font-size:15px;cursor:pointer}.tab-btn.active{color:var(--primary-2);border-color:var(--primary-2)}.word-builder{display:flex;flex-direction:column;align-items:center;gap:14px;margin:12px 0}.slots{display:flex;gap:6px;flex-wrap:wrap;justify-content:center}.slot{width:40px;height:46px;border-bottom:3px solid var(--primary-2);display:grid;place-items:center;font-size:24px;font-weight:700;color:var(--text)}.slot.filled{background:var(--panel-2);border-radius:8px}.slot-space{width:18px;align-self:stretch;border-bottom:3px dotted transparent}.letter-pool{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}.tile{width:44px;min-width:44px;height:44px;padding:0;display:grid;place-items:center;font-size:22px;border-radius:12px;background:var(--panel-2)}.tile.used{opacity:.3}.word-tile{width:auto;min-width:44px;height:auto;padding:8px 14px;font-size:20px}.hand-pad{margin:10px 0}.hand-pad canvas{width:100%;height:200px;border:2px solid var(--panel-2);border-radius:16px;touch-action:none;display:block}.hand-actions{display:flex;gap:8px;margin-top:10px}.order-words{margin:8px 0}.placed{min-height:52px;display:flex;gap:8px;flex-wrap:wrap;align-items:center;justify-content:center;background:var(--panel);border:2px dashed var(--panel-2);border-radius:16px;padding:8px;margin:10px 0}.placed .placeholder{color:var(--muted);font-size:15px}.placed-chip{background:var(--primary);color:#fff;font-size:18px;cursor:pointer}.pool{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}.wb-streak{margin-left:auto;font-size:13px;color:var(--gold)}.wb-meta{margin-top:6px;display:flex;gap:8px;align-items:center;color:var(--muted);font-size:14px}.wb-meta .tag{margin-right:4px}.rank-card{display:flex;gap:14px;align-items:center;background:linear-gradient(135deg,var(--panel),var(--panel-2));border:2px solid var(--primary);border-radius:var(--radius);padding:16px;margin:8px 0 12px}.rank-icon{font-size:46px}.rank-body{flex:1}.rank-name{font-size:20px;font-weight:800;margin-bottom:6px}.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:12px 0}.stat{background:var(--panel);border-radius:14px;padding:12px 6px;text-align:center}.stat-n{font-size:20px;font-weight:800;color:var(--primary-2)}.stat-label{font-size:12px;color:var(--muted)}.cal{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;margin-top:8px}.cal-cell{aspect-ratio:1;border-radius:8px;background:var(--panel-2);display:grid;place-items:center;font-size:12px;color:var(--muted)}.cal-cell.on{background:var(--ok);color:#06301a;font-weight:700}.cal-cell.today{outline:2px solid var(--gold)}.badge-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:8px}.badge{border-radius:14px;padding:12px;text-align:center;background:var(--panel-2)}.badge.locked{opacity:.5}.badge.earned{border:2px solid var(--gold)}.badge-mark{font-size:28px}.badge-title{font-weight:700;margin-top:4px}.badge-desc{font-size:12px;color:var(--muted)}.stage-legend{display:flex;flex-wrap:wrap;gap:10px;margin:8px 0;font-size:14px}.stage-item b{color:var(--primary-2)}.spirit-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(76px,1fr));gap:8px}.spirit{display:flex;flex-direction:column;align-items:center;background:var(--panel-2);border-radius:12px;padding:8px 4px}.spirit-emoji{font-size:26px}.spirit-en{font-size:12px;margin-top:2px;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.scene{margin:10px 0}.scene-head{width:100%;display:flex;align-items:center;gap:10px;background:var(--panel);text-align:left}.scene-words{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.word-chip{background:var(--panel-2);border:2px solid transparent;color:var(--text);border-radius:999px;padding:8px 14px;font-size:16px;cursor:pointer}.word-chip.sel{border-color:var(--primary-2)}.picked-card{border:2px solid var(--primary-2)}.seg{display:flex;gap:8px;flex-wrap:wrap}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:10px}.athome-banner{display:flex;align-items:center;gap:10px;background:#ffd76a24;border:1px solid var(--gold);border-radius:14px;padding:10px 12px;margin-bottom:10px;font-size:14px}.err{color:var(--warn);font-weight:600}code{background:var(--panel-2);color:var(--primary-2);padding:1px 6px;border-radius:6px;font-size:.88em}