:root{--bg: #f7f5ef;--bg-elev: #ffffff;--border: #e5e1d5;--text: #1b1b1b;--muted: #6b6b6b;--accent: #b13a3a;--accent-soft: #fbeaea;--btn: #1b1b1b;--btn-fg: #ffffff;--good: #2e7d32;--hard: #ef6c00;--again: #c62828;--partial: #1565c0;--shadow: 0 1px 2px rgba(0, 0, 0, .04), 0 2px 12px rgba(0, 0, 0, .04);font-family:PingFang SC,Microsoft YaHei,Hiragino Sans GB,system-ui,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;min-height:100vh}body{background:var(--bg)}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button{font:inherit;cursor:pointer;border:1px solid var(--border);background:#fff;padding:6px 12px;border-radius:6px;color:var(--text);transition:background .12s ease,border-color .12s ease}button:hover{border-color:#c7c0ad}button.primary{background:var(--btn);color:var(--btn-fg);border-color:var(--btn)}button.primary:hover{background:#000}button.ghost{background:transparent}button[disabled]{opacity:.5;cursor:not-allowed}input[type=text],input[type=search],textarea,select{font:inherit;border:1px solid var(--border);background:#fff;padding:6px 10px;border-radius:6px;color:var(--text);width:100%}.layout{display:flex;min-height:100vh;flex-direction:column}.navbar{display:flex;align-items:center;gap:16px;padding:10px 20px;background:var(--bg-elev);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.navbar .brand{font-weight:700;font-size:18px}.navbar .spacer{flex:1}.navbar nav{display:flex;gap:6px}.navbar nav a{padding:6px 10px;border-radius:6px;color:var(--muted)}.navbar nav a.active{background:var(--accent-soft);color:var(--accent)}.main{flex:1;padding:20px;max-width:1280px;width:100%;margin:0 auto}.grid-2{display:grid;grid-template-columns:320px 1fr;gap:20px}@media (max-width: 980px){.grid-2{grid-template-columns:1fr}}.card{background:var(--bg-elev);border:1px solid var(--border);border-radius:10px;padding:16px;box-shadow:var(--shadow)}.section-title{font-size:14px;color:var(--muted);margin:0 0 8px;letter-spacing:1px}.pack-item{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:8px;cursor:pointer}.pack-item:hover{background:#faf7ee}.pack-item.selected{background:var(--accent-soft)}.pack-item .name{font-weight:600;flex:1}.pack-item .meta{font-size:12px;color:var(--muted)}.pack-item input{width:auto}.chips{display:flex;flex-wrap:wrap;gap:6px}.chip{padding:4px 10px;font-size:13px;border:1px solid var(--border);border-radius:999px;background:#fff;cursor:pointer;-webkit-user-select:none;user-select:none}.chip.on{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}.chip .count{color:var(--muted);margin-left:6px;font-size:12px}.dropzone{border:2px dashed var(--border);border-radius:10px;padding:18px;text-align:center;color:var(--muted);background:#fffaf0;cursor:pointer}.dropzone.hover{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}.study-wrap{display:flex;flex-direction:column;gap:16px}.study-head{display:flex;align-items:center;gap:12px}.study-head .word{font-size:46px;font-weight:700;letter-spacing:2px}.study-head .module-tag{padding:2px 10px;background:var(--accent-soft);color:var(--accent);border-radius:999px;font-size:12px}.study-head .progress{margin-left:auto;color:var(--muted);font-size:13px}.source-summary{display:flex;flex-wrap:wrap;gap:6px;margin-top:-6px}.source-chip{font-size:12px;padding:2px 8px;background:#f0ede4;color:var(--muted);border-radius:4px;border:1px solid var(--border)}.source-tag{flex-shrink:0;font-size:11px;padding:1px 6px;background:#f5f0e0;color:#8b7a5e;border-radius:4px;white-space:nowrap}.sentences{display:flex;flex-direction:column;gap:10px}.sentence-row{background:#fff;border:1px solid var(--border);border-radius:10px;padding:14px 16px;transition:border-color .12s,background .12s,opacity .2s}.sentence-row.focus{border-color:#b5a97b;box-shadow:0 0 0 2px #f2ead0}.sentence-row.rated{opacity:.55}.sentence-row .line{display:flex;align-items:baseline;gap:14px}.sentence-row .sentence{font-size:20px;line-height:1.7;flex:1}.sentence-row .sentence .hit{color:var(--accent);font-weight:700;text-decoration:underline;text-underline-offset:4px}.sentence-row .reveal-btn{color:var(--muted);background:transparent;border:1px dashed var(--border)}.sentence-row .reveal-btn:hover{color:var(--accent);border-color:var(--accent)}.detail{margin-top:10px;padding:10px 12px;background:#fbf7ea;border-radius:8px;border:1px solid #ece3c1}.detail .row{margin-bottom:4px;font-size:14px}.detail .row.explain{font-size:15px;color:var(--text)}.detail .row .label{color:var(--muted);margin-right:8px}.rating-bar{display:flex;gap:8px;margin-top:10px}.rating-bar button{flex:0 0 auto;padding:6px 12px;font-size:13px;border-radius:999px}.rating-bar button.again{border-color:var(--again);color:var(--again)}.rating-bar button.hard{border-color:var(--hard);color:var(--hard)}.rating-bar button.partial{border-color:var(--partial);color:var(--partial)}.rating-bar button.good{border-color:var(--good);color:var(--good)}.rating-bar button.selected{background:currentColor;color:#fff!important}.rating-bar button.again.selected{background:var(--again);border-color:var(--again);color:#fff}.rating-bar button.hard.selected{background:var(--hard);border-color:var(--hard);color:#fff}.rating-bar button.partial.selected{background:var(--partial);border-color:var(--partial);color:#fff}.rating-bar button.good.selected{background:var(--good);border-color:var(--good);color:#fff}.global-bar{position:sticky;bottom:0;display:flex;gap:10px;padding:10px;background:#ffffffe6;border-top:1px solid var(--border);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);justify-content:center;z-index:5}.card.study-wrap{margin-bottom:60px}.empty{text-align:center;color:var(--muted);padding:40px 20px}.toast{position:fixed;bottom:20px;left:50%;transform:translate(-50%);background:#1b1b1b;color:#fff;padding:10px 16px;border-radius:8px;font-size:13px;z-index:100;box-shadow:0 4px 20px #0003}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.stat-card{text-align:center}.stat-card .val{font-size:28px;font-weight:700}.stat-card .lbl{color:var(--muted);font-size:13px;margin-top:4px}.note-panel{margin-top:8px;padding:8px;border-top:1px dashed var(--border)}.mastered-btn{background:#fbbf24;color:#78350f;border:none;padding:4px 12px;border-radius:6px;font-size:12px;font-weight:600;cursor:pointer;transition:all .2s}.mastered-btn:hover{background:#f59e0b}.mastered-btn.confirm{background:#dc2626;color:#fff;animation:pulse 1s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}.reinforcement-tag{display:inline-block;padding:2px 8px;border-radius:10px;background:#dbeafe;color:#1d4ed8;font-size:11px;font-weight:600}.queue-label{display:inline-block;padding:2px 10px;border-radius:10px;background:#f0f9ff;color:#0369a1;font-size:12px;font-weight:600}.urgent-banner{display:flex;align-items:center;gap:8px;padding:8px 14px;border-radius:8px;background:#fef2f2;border:1px solid #fecaca;font-size:13px;color:#991b1b}.urgent-icon{font-size:16px}.urgent-banner .ghost{color:#dc2626;font-weight:600;margin-left:auto}.stat-card.clickable{cursor:pointer;transition:box-shadow .2s}.stat-card.clickable:hover{box-shadow:0 2px 12px #0000001a}.review-list-card h3{margin:0;font-size:15px}.review-grid{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.review-chip{display:flex;align-items:center;gap:6px;padding:4px 10px 4px 4px;border-radius:8px;background:#f8fafc;border:1px solid var(--border);font-size:13px;cursor:pointer;transition:background .15s}.review-chip:hover{background:#e0f2fe}.review-chip.danger{border-color:#fca5a5;background:#fef2f2}.review-chip.warning{border-color:#fed7aa;background:#fffbeb}.review-chip.mastered{border-color:#fbbf24;background:#fffbeb;color:#92400e}.review-chip.more{color:var(--muted);font-style:italic;cursor:default}.chip-word{font-weight:600}.word-table{width:100%;border-collapse:collapse;font-size:13px}.word-table th{text-align:left;padding:6px 8px;color:var(--muted);border-bottom:1px solid var(--border)}.word-table td{padding:6px 8px;border-bottom:1px solid #f1f5f9}.word-table tr.danger td{background:#fef2f2}.word-table tr.warning td{background:#fffbeb}.word-table tr.expanded td{background:#f0f9ff}.word-cell{font-weight:600}.sortable-th{cursor:pointer;-webkit-user-select:none;user-select:none}.sortable-th:hover{color:#0f172a}.word-table-card h3{margin:0;font-size:15px}.status-badge{display:inline-block;padding:2px 8px;border-radius:10px;font-size:11px;font-weight:600}.status-badge.danger{background:#fef2f2;color:#dc2626}.status-badge.warning{background:#fffbeb;color:#d97706}.status-badge.safe{background:#f0fdf4;color:#16a34a}.status-badge.new{background:#f0f9ff;color:#0369a1}.status-badge.mastered{background:#fffbeb;color:#92400e}.weak-panel h3{margin:0;font-size:15px}.inline-study-panel{padding:8px 0}.inline-study-row{display:flex;align-items:center;gap:8px;padding:6px 0;border-bottom:1px solid #f1f5f9}.inline-study-sentence{display:flex;align-items:center;gap:6px;flex:1;min-width:0}.inline-study-word{font-weight:600;flex-shrink:0}.inline-study-explain{color:var(--muted);font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.rating-bar.compact{gap:4px}.rating-bar.compact button{padding:2px 8px;font-size:11px}.drilldown-panel{background:#f8fafc;border:1px solid var(--border);border-radius:8px;margin-top:8px;overflow:hidden;animation:slideDown .2s ease}@keyframes slideDown{0%{opacity:0;max-height:0}to{opacity:1;max-height:500px}}.drilldown-header{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;font-weight:600;font-size:13px;border-bottom:1px solid var(--border)}.drilldown-list{max-height:300px;overflow-y:auto}.drilldown-row{display:flex;align-items:center;gap:10px;padding:6px 14px;border-bottom:1px solid #f1f5f9;font-size:13px}.drilldown-row.urgent{background:#fef2f2}.drilldown-word{font-weight:600;min-width:50px}.drilldown-source{color:var(--muted);font-size:12px;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.drilldown-explain{color:#475569;flex:2;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.drilldown-diff{color:var(--muted);font-size:11px;flex-shrink:0}.streak-grid{display:flex;flex-wrap:wrap;gap:3px}.streak-cell{width:12px;height:12px;border-radius:2px;background:#e5e7eb}.streak-cell.active{background:#22c55e}.polysemy-group{border:1px solid var(--border);border-radius:8px;overflow:hidden}.polysemy-header{display:flex;align-items:center;gap:10px;padding:8px 12px;background:#f8fafc;border-bottom:1px solid var(--border)}.polysemy-word{font-weight:700;font-size:15px}.polysemy-range{color:var(--muted);font-size:12px;flex:1}.polysemy-senses{padding:6px 12px}.polysemy-sense{display:flex;align-items:center;gap:8px;padding:4px 0;border-bottom:1px solid #f1f5f9;font-size:13px}.polysemy-sense:last-child{border-bottom:none}.sense-explain{flex:1}.sense-source{color:var(--muted);font-size:12px}.sense-badge{display:inline-block;padding:3px 10px;border-radius:10px;background:#ede9fe;color:#6d28d9;font-size:11px;font-weight:500;margin-top:4px}.study-summary{text-align:center;padding:32px 20px}.study-summary h2{margin:0 0 20px;font-size:22px;color:#22c55e}.summary-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.summary-item{text-align:center}.summary-val{font-size:24px;font-weight:700}.summary-lbl{color:var(--muted);font-size:12px;margin-top:2px}.stats-guide-banner{background:linear-gradient(135deg,#eef2ff,#e0f2fe);border:1px solid #bfdbfe;border-radius:10px;padding:14px 18px;display:flex;align-items:flex-start;gap:12px}.stats-guide-banner .guide-content{flex:1;font-size:13px;line-height:1.7;color:#1e3a5f}.stats-guide-banner .guide-content ul{margin:6px 0 0;padding-left:18px}.stats-guide-banner .guide-content li{margin-bottom:2px}.stats-guide-banner .guide-dismiss{white-space:nowrap;color:#3b82f6;font-size:13px;font-weight:500;margin-top:2px}.stats-nav{display:flex;flex-wrap:wrap;gap:6px;padding:8px 0;position:sticky;top:0;z-index:10;background:var(--bg);border-bottom:1px solid var(--border);margin-bottom:4px}.stats-nav a{font-size:12px;padding:4px 10px;border-radius:12px;background:var(--bg-elev);border:1px solid var(--border);color:var(--text);text-decoration:none;transition:background .12s ease}.stats-nav a:hover{background:#e2e8f0;text-decoration:none}.section-desc{font-size:12px;color:var(--muted);margin:0 0 10px;line-height:1.5}.skeleton-block{background:linear-gradient(90deg,#f1f1f1 25%,#e8e8e8,#f1f1f1 75%);background-size:200% 100%;animation:skeleton-shimmer 1.5s ease infinite;border-radius:8px}@keyframes skeleton-shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.empty-state-card{text-align:center;padding:48px 24px;background:var(--bg-elev);border:1px solid var(--border);border-radius:12px}.empty-state-card .empty-icon{font-size:48px;margin-bottom:12px}.empty-state-card h2{margin:0 0 8px;font-size:20px;color:var(--text)}.empty-state-card>p{color:var(--muted);font-size:14px;margin:0 0 24px}.empty-steps{display:flex;flex-direction:column;gap:12px;max-width:320px;margin:0 auto;text-align:left}.empty-step{display:flex;align-items:center;gap:10px;font-size:14px}.empty-step .step-num{width:24px;height:24px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0}.back-to-top{position:sticky;bottom:16px;align-self:flex-end;background:var(--btn);color:var(--btn-fg);border:none;border-radius:20px;padding:8px 14px;font-size:12px;font-weight:500;box-shadow:0 2px 8px #00000026;cursor:pointer;z-index:10;transition:transform .12s ease}.back-to-top:hover{transform:translateY(-2px)}.review-chip.mastered{position:relative;display:inline-flex;align-items:center;gap:4px}.unmaster-btn{position:absolute;top:-6px;right:-6px;width:16px;height:16px;border-radius:50%;background:#ef4444;color:#fff;border:none;font-size:11px;line-height:1;cursor:pointer;display:none;align-items:center;justify-content:center;padding:0}.review-chip.mastered:hover .unmaster-btn{display:flex}.unmaster-confirm{display:flex;gap:4px;margin-left:4px}.budget-bar{display:flex;flex-direction:column;gap:4px}.budget-segments{height:6px;background:#e2e8f0;border-radius:3px;display:flex;overflow:hidden}.budget-fill{height:100%;transition:width .3s ease}.budget-fill.review{background:#3b82f6}.budget-fill.new{background:#22c55e}.budget-text{font-size:11px;color:var(--muted)}