:root{--bg:#fff;--bg-raised:#f8fafc;--text:#64748b;--text-strong:#0f172a;--border:#e2e8f0;--card-bg:#fff;--card-shadow:0 1px 3px #0000000a, 0 8px 32px #0000000f;--accent:#7c3aed;--accent-bg:#7c3aed12;--accent-border:#7c3aed40;--overlay:#0f172a73;--modal-bg:#fff;--input-bg:#f8fafc;--success:#16a34a;--warning:#ea580c;--danger:#dc2626;--info:#2563eb;--font-sans:"Inter", system-ui, -apple-system, sans-serif;--font-chinese:"Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;--font-mono:ui-monospace, "SF Mono", Consolas, monospace;--radius:10px;--radius-sm:6px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}:root:not([data-theme=light]){--bg:#0c0e14;--bg-raised:#151821;--text:#8b95a8;--text-strong:#e2e8f0;--border:#1e2433;--card-bg:#151821;--card-shadow:0 1px 3px #0003, 0 8px 32px #00000040;--accent:#a78bfa;--accent-bg:#a78bfa1a;--accent-border:#a78bfa40;--overlay:#0009;--modal-bg:#151821;--input-bg:#1a1f2e}}:root[data-theme=dark]{--bg:#0c0e14;--bg-raised:#151821;--text:#8b95a8;--text-strong:#e2e8f0;--border:#1e2433;--card-bg:#151821;--card-shadow:0 1px 3px #0003, 0 8px 32px #00000040;--accent:#a78bfa;--accent-bg:#a78bfa1a;--accent-border:#a78bfa40;--overlay:#0009;--modal-bg:#151821;--input-bg:#1a1f2e}*,:before,:after{box-sizing:border-box}body{font:15px/1.5 var(--font-sans);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;margin:0}#root{max-width:1080px;margin:0 auto}h1,h2,h3{color:var(--text-strong);margin:0 0 8px;font-weight:600}h2{font-size:20px}h3{text-transform:uppercase;letter-spacing:.5px;color:var(--text);font-size:14px}code{font-family:var(--font-mono);background:var(--bg-raised);border:1px solid var(--border);border-radius:4px;padding:2px 6px;font-size:13px}kbd{font-family:var(--font-mono);opacity:.5;border:1px solid;border-radius:3px;padding:1px 5px;font-size:11px;line-height:1.4;display:inline-block}.app{flex-direction:column;min-height:100svh;display:flex}.center-message{justify-content:center;align-items:center;height:100svh;font-size:16px;display:flex}.main{flex-direction:column;flex:1;justify-content:center;align-items:center;padding:24px 20px 40px;display:flex}.toolbar{border-bottom:1px solid var(--border);background:var(--bg);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:10px 16px;display:flex}.toolbar-left,.toolbar-right{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.toolbar-field{color:var(--text);align-items:center;gap:5px;font-size:13px;font-weight:500;display:flex}.toolbar-field select,.toolbar-field input[type=number]{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--input-bg);color:var(--text-strong);padding:4px 8px;font-family:inherit;font-size:13px}.toolbar-field input[type=number]{width:56px}.toolbar-check{cursor:pointer;-webkit-user-select:none;user-select:none;color:var(--text);align-items:center;gap:5px;font-size:13px;display:flex}.toolbar-check input{accent-color:var(--accent)}.toolbar-icon{border:1px solid var(--border);border-radius:var(--radius-sm);width:32px;height:32px;color:var(--text);cursor:pointer;background:0 0;justify-content:center;align-items:center;font-size:16px;transition:all .15s;display:flex}.toolbar-icon:hover{background:var(--accent-bg);border-color:var(--accent-border);color:var(--accent)}.toolbar-divider{background:var(--border);width:1px;height:24px}.btn-primary,.btn-outline{border-radius:var(--radius-sm);cursor:pointer;border:1px solid #0000;padding:6px 14px;font-family:inherit;font-size:13px;font-weight:600;transition:all .15s}.btn-sm{padding:5px 12px;font-size:12px}.btn-primary{background:var(--danger);color:#fff;border-color:var(--danger)}.btn-primary:hover{filter:brightness(.9)}.btn-outline{color:var(--text-strong);border-color:var(--border);background:0 0}.btn-outline:hover{background:var(--accent-bg);border-color:var(--accent-border);color:var(--accent)}.btn-icon{border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);cursor:pointer;background:0 0;justify-content:center;align-items:center;padding:6px 8px;transition:all .15s;display:flex}.btn-icon:hover{background:var(--accent-bg);border-color:var(--accent-border);color:var(--accent)}.progress-track{background:var(--border);height:3px}.progress-fill{background:var(--accent);border-radius:0 2px 2px 0;height:100%;transition:width .4s}.flash{background:var(--success);color:#fff;text-align:center;padding:7px 16px;font-size:13px;font-weight:600;animation:.15s ease-out fadeIn}.info-bar{color:var(--text);border-bottom:1px solid var(--border);align-items:center;gap:20px;padding:7px 16px;font-size:12px;display:flex}.info-bar strong{color:var(--text-strong)}.streak-badge{color:var(--warning);margin-left:auto;font-weight:600}.card{border:1px solid var(--border);background:var(--card-bg);width:100%;max-width:560px;min-height:240px;box-shadow:var(--card-shadow);border-radius:16px;flex-direction:column;justify-content:center;align-items:center;gap:8px;padding:40px 32px 24px;display:flex}.card-meaning{color:var(--text-strong);text-align:center;font-size:22px;font-weight:500;line-height:1.4}.card-chinese{flex-direction:column;align-items:center;gap:2px;display:flex}.hanzi-row{align-items:center;gap:8px;display:flex}.hanzi{font-family:var(--font-chinese);color:var(--text-strong);font-size:48px;font-weight:700;line-height:1.2}.pinyin{color:var(--accent);font-size:18px;font-weight:500}.btn-speak{color:var(--text);cursor:pointer;opacity:.5;background:0 0;border:none;border-radius:4px;justify-content:center;align-items:center;padding:4px;transition:all .15s;display:flex}.btn-speak:hover{opacity:1;color:var(--accent);background:var(--accent-bg)}.card-answer{border-top:1px dashed var(--border);margin-top:4px;padding-top:12px;animation:.2s ease-out slideUp}.card-answer .card-meaning{color:var(--info);font-weight:600}.card-meta{color:var(--text);align-items:center;gap:6px;margin-top:12px;font-size:12px;display:flex}.badge-new{background:var(--success);color:#fff;border-radius:4px;margin-left:4px;padding:1px 6px;font-size:10px;font-weight:700}.badge-leech{background:var(--warning);color:#fff;border-radius:4px;margin-left:4px;padding:1px 6px;font-size:10px;font-weight:700}.controls{flex-direction:column;align-items:center;gap:14px;width:100%;max-width:560px;margin-top:24px;display:flex}.progress-text{color:var(--text);font-size:12px}.btn-reveal{border:2px solid var(--accent);border-radius:var(--radius);background:var(--accent-bg);color:var(--accent);cursor:pointer;padding:12px 48px;font-family:inherit;font-size:15px;font-weight:600;transition:all .15s}.btn-reveal:hover{background:var(--accent);color:#fff}.grade-buttons{flex-wrap:wrap;justify-content:center;gap:8px;display:flex}.btn-grade{border-radius:var(--radius);cursor:pointer;background:0 0;border:2px solid;flex-direction:column;align-items:center;gap:2px;min-width:80px;padding:10px 16px 8px;font-family:inherit;transition:all .15s;display:flex}.btn-grade .grade-label{font-size:14px;font-weight:600}.btn-grade .grade-interval{opacity:.7;font-size:11px}.btn-again{border-color:var(--danger);color:var(--danger)}.btn-again:hover{background:var(--danger);color:#fff}.btn-hard{border-color:var(--warning);color:var(--warning)}.btn-hard:hover{background:var(--warning);color:#fff}.btn-good{border-color:var(--success);color:var(--success)}.btn-good:hover{background:var(--success);color:#fff}.btn-easy{border-color:var(--info);color:var(--info)}.btn-easy:hover{background:var(--info);color:#fff}.secondary-actions{gap:6px;display:flex}.done-screen{text-align:center;max-width:400px}.done-icon{margin-bottom:12px;font-size:56px}.done-screen h2{margin-bottom:16px}.done-stats{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-raised);margin:20px 0 24px;padding:16px 20px}.done-stats p{margin:4px 0}.done-breakdown{flex-wrap:wrap;justify-content:center;gap:12px;margin:10px 0;font-size:13px;font-weight:600;display:flex}.grade-again{color:var(--danger)}.grade-hard{color:var(--warning)}.grade-good{color:var(--success)}.grade-easy{color:var(--info)}.done-accuracy{color:var(--text-strong);font-size:18px}.modal-overlay{background:var(--overlay);z-index:100;justify-content:center;align-items:center;padding:20px;animation:.15s ease-out fadeIn;display:flex;position:fixed;inset:0}.modal{background:var(--modal-bg);border:1px solid var(--border);border-radius:16px;width:100%;max-width:520px;max-height:85vh;padding:24px;animation:.2s ease-out slideUp;overflow-y:auto}.modal-wide{max-width:720px}.modal-compact{max-width:400px}.modal-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.modal-header h2{margin:0}.modal-close{border:1px solid var(--border);border-radius:var(--radius-sm);width:32px;height:32px;color:var(--text);cursor:pointer;background:0 0;justify-content:center;align-items:center;font-size:18px;transition:all .15s;display:flex}.modal-close:hover{background:var(--accent-bg);color:var(--accent)}.stats-grid{grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:20px;display:grid}.stat-card{border:1px solid var(--border);border-radius:var(--radius-sm);text-align:center;background:var(--bg-raised);padding:12px 8px}.stat-value{color:var(--text-strong);font-size:22px;font-weight:700;line-height:1.2}.stat-label{color:var(--text);margin-top:2px;font-size:11px}.streak-fire{font-size:18px}.stats-section{margin-bottom:20px}.stats-section h3{margin-bottom:10px}.retention-rows{flex-direction:column;gap:8px;display:flex}.retention-row{align-items:center;gap:10px;font-size:13px;display:flex}.retention-row>span:first-child{flex-shrink:0;width:90px}.retention-bar-track{background:var(--bg-raised);border:1px solid var(--border);border-radius:4px;flex:1;height:8px;overflow:hidden}.retention-bar-fill{background:var(--success);border-radius:4px;height:100%;transition:width .3s}.retention-pct{text-align:right;width:40px;color:var(--text-strong);font-weight:600}.chart{align-items:flex-end;gap:4px;height:100px;padding:4px 0;display:flex}.chart-col{flex-direction:column;flex:1;align-items:center;gap:2px;min-width:0;display:flex}.chart-bar-track{align-items:flex-end;width:100%;height:70px;display:flex}.chart-bar-fill{background:var(--accent);border-radius:3px 3px 0 0;width:100%;min-height:1px;transition:height .3s}.chart-label{color:var(--text);font-size:9px}.chart-value{color:var(--text-strong);font-size:9px;font-weight:600}.maturity-rows{flex-direction:column;gap:6px;display:flex}.maturity-row{align-items:center;gap:10px;font-size:13px;display:flex}.maturity-label{text-transform:capitalize;width:70px;font-size:12px;font-weight:600}.maturity-track{background:var(--bg-raised);border:1px solid var(--border);border-radius:5px;flex:1;height:10px;overflow:hidden}.maturity-fill{border-radius:5px;height:100%;transition:width .3s}.maturity-count{text-align:right;width:40px;color:var(--text-strong);font-size:12px;font-weight:600}.status-new{color:var(--info)}.maturity-fill.status-new{background:var(--info)}.status-learning{color:var(--warning)}.maturity-fill.status-learning{background:var(--warning)}.status-young{color:var(--success)}.maturity-fill.status-young{background:var(--success)}.status-mature{color:#7c3aed}.maturity-fill.status-mature{background:#7c3aed}.stats-actions{border-top:1px solid var(--border);gap:8px;padding-top:16px;display:flex}.browse-search{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--input-bg);width:100%;color:var(--text-strong);outline:none;margin-bottom:10px;padding:10px 14px;font-family:inherit;font-size:14px;transition:border-color .15s}.browse-search:focus{border-color:var(--accent)}.browse-filters{flex-wrap:wrap;gap:6px;margin-bottom:10px;display:flex}.filter-chip{border:1px solid var(--border);color:var(--text);cursor:pointer;text-transform:capitalize;background:0 0;border-radius:20px;padding:4px 12px;font-family:inherit;font-size:12px;font-weight:500;transition:all .15s}.filter-chip:hover{border-color:var(--accent-border);color:var(--accent)}.filter-chip.active{background:var(--accent);border-color:var(--accent);color:#fff}.browse-meta{color:var(--text);margin-bottom:8px;font-size:12px}.browse-list{border:1px solid var(--border);border-radius:var(--radius-sm);max-height:400px;overflow-y:auto}.browse-header-row{text-transform:uppercase;letter-spacing:.3px;color:var(--text);background:var(--bg-raised);border-bottom:1px solid var(--border);grid-template-columns:60px 90px 1fr 60px 40px;gap:8px;padding:8px 12px;font-size:11px;font-weight:600;display:grid;position:sticky;top:0}.browse-row{border-bottom:1px solid var(--border);grid-template-columns:60px 90px 1fr 60px 40px;align-items:center;gap:8px;padding:7px 12px;font-size:13px;transition:background .1s;display:grid}.browse-row:last-child{border-bottom:none}.browse-row:hover{background:var(--accent-bg)}.browse-hanzi{font-family:var(--font-chinese);color:var(--text-strong);font-weight:600}.browse-pinyin{color:var(--accent);font-size:12px}.browse-meaning{color:var(--text);text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.browse-badge{text-transform:capitalize;font-size:11px;font-weight:600}.browse-cefr{color:var(--text);text-align:center;font-size:11px}.browse-empty{text-align:center;color:var(--text);padding:32px}.shortcuts-list{flex-direction:column;gap:6px;display:flex}.shortcut-row{align-items:center;gap:12px;padding:4px 0;font-size:14px;display:flex}.shortcut-row kbd{text-align:center;opacity:1;background:var(--bg-raised);border-color:var(--border);min-width:80px;padding:3px 8px;font-size:12px}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.auth-page{background:var(--bg);justify-content:center;align-items:center;min-height:100svh;padding:20px;display:flex}.auth-card{border:1px solid var(--border);background:var(--card-bg);width:100%;max-width:400px;box-shadow:var(--card-shadow);border-radius:16px;padding:32px}.auth-header{text-align:center;margin-bottom:24px}.auth-logo{font-size:40px;font-family:var(--font-chinese);color:var(--accent);margin-bottom:8px;display:inline-block}.auth-header h1{margin:0 0 4px;font-size:22px}.auth-header p{color:var(--text);margin:0;font-size:13px}.auth-tabs{border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:20px;display:flex;overflow:hidden}.auth-tab{color:var(--text);cursor:pointer;background:0 0;border:none;flex:1;padding:8px;font-family:inherit;font-size:13px;font-weight:600;transition:all .15s}.auth-tab.active{background:var(--accent);color:#fff}.auth-form{flex-direction:column;gap:14px;display:flex}.auth-field{color:var(--text);flex-direction:column;gap:4px;font-size:13px;font-weight:500;display:flex}.auth-field input{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--input-bg);color:var(--text-strong);outline:none;padding:10px 12px;font-family:inherit;font-size:14px;transition:border-color .15s}.auth-field input:focus{border-color:var(--accent)}.auth-error{color:var(--danger);border:1px solid var(--danger);border-radius:var(--radius-sm);background:#dc26260f;padding:8px 12px;font-size:13px}.auth-submit{border-radius:var(--radius-sm);background:var(--accent);color:#fff;cursor:pointer;border:none;padding:10px;font-family:inherit;font-size:14px;font-weight:600;transition:filter .15s}.auth-submit:hover{filter:brightness(.9)}.auth-submit:disabled{opacity:.6;cursor:not-allowed}.auth-divider{color:var(--text);align-items:center;gap:12px;margin:20px 0;font-size:12px;display:flex}.auth-divider:before,.auth-divider:after{content:"";background:var(--border);flex:1;height:1px}.auth-social{gap:8px;display:flex}.auth-social-btn{border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-strong);cursor:pointer;background:0 0;flex:1;justify-content:center;align-items:center;gap:8px;padding:10px;font-family:inherit;font-size:13px;font-weight:500;transition:all .15s;display:flex}.auth-social-btn:hover{background:var(--accent-bg);border-color:var(--accent-border)}.toolbar-user{color:var(--text);text-overflow:ellipsis;white-space:nowrap;max-width:100px;font-size:12px;font-weight:500;overflow:hidden}@media (width<=640px){.toolbar{gap:8px;padding:8px 12px}.toolbar-left,.toolbar-right{gap:6px}.toolbar-right{flex-wrap:wrap;justify-content:flex-end}.toolbar-divider{display:none}.stats-grid{grid-template-columns:repeat(2,1fr)}.card{min-height:200px;padding:28px 20px 20px}.hanzi{font-size:40px}.card-meaning{font-size:18px}.grade-buttons{gap:6px}.btn-grade{min-width:68px;padding:8px 10px 6px}.btn-grade .grade-label{font-size:12px}.browse-header-row,.browse-row{grid-template-columns:50px 70px 1fr 50px 32px;gap:4px;padding:6px 8px;font-size:12px}.modal{padding:16px}}