@font-face{font-family:Noto Sans;font-weight:400;src:url(/fonts/NotoSans-Regular.ttf)format("truetype");font-display:swap}@font-face{font-family:Noto Sans;font-weight:500;src:url(/fonts/NotoSans-Medium.ttf)format("truetype");font-display:swap}@font-face{font-family:Noto Sans;font-weight:700;src:url(/fonts/NotoSans-Bold.ttf)format("truetype");font-display:swap}@font-face{font-family:AR PL UKai TW;font-weight:400;src:url(/fonts/ARPLUKai-TW.ttf)format("truetype");font-display:swap}@font-face{font-family:Noto Sans SC;font-weight:500;src:url(/fonts/NotoSansSC-Medium.ttf)format("truetype");font-display:swap}@font-face{font-family:Material Icons;font-weight:400;font-style:normal;src:url(/fonts/MaterialIcons-subset.ttf?v=9)format("truetype");font-display:block}.material-icon{-webkit-font-smoothing:antialiased;font-family:Material Icons;font-style:normal;font-weight:400;line-height:1;display:inline-block}:root{--bg:#09090b;--surface:#27272a;--text:#fafafa;--text-muted:#a1a1aa;--border:#27272a;--accent:#fafafa;--accent-text:#18181b;--success:#00bc7d;--danger:#ff2056;--link:#2b7fff;--stroke-bg:#18181b;--ring:#d4d4d8;--shadow-sm:0 1px 2px 0 #0006;--radius:.5rem;--font-ui:"Noto Sans", "AR PL UKai TW", system-ui, sans-serif;--font-hanzi:"AR PL UKai TW", "Noto Sans", sans-serif}*{box-sizing:border-box}a,a:visited{color:var(--link)}body{font-family:var(--font-ui);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;overflow-wrap:break-word;margin:0}#app{flex-direction:column;max-width:480px;min-height:100vh;margin:0 auto;display:flex;overflow-x:hidden}.page{flex:1;padding:16px}h1,h2,h3{letter-spacing:-.01em;margin:0 0 12px}.hanzi{font-family:var(--font-hanzi)}.hanzi-list{font-size:20px}.hanzi-list-lg{font-size:25px}button,input,select{font-family:inherit;font-size:16px}button,input[type=text],input[type=email],input[type=password],a:focus-visible,[tabindex]:focus-visible{outline:none}button:focus-visible,input[type=text]:focus-visible,input[type=email]:focus-visible,input[type=password]:focus-visible,a:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--ring);outline-offset:2px}button{border-radius:calc(var(--radius) - 2px);border:1px solid var(--border);background:var(--surface);min-width:44px;min-height:44px;color:var(--text);box-shadow:var(--shadow-sm);cursor:pointer;padding:10px 16px;font-weight:500}button:hover:not(:disabled){opacity:.9}button:active{transform:scale(.98)}button:disabled{cursor:not-allowed}.btn-primary{background:var(--accent);color:var(--accent-text);border-color:var(--accent)}.btn-success,.btn-danger{background:var(--surface);color:var(--text);border-color:var(--border)}.btn-block{width:100%}.btn-destructive{background:var(--danger);color:#fff;border-color:var(--danger)}.btn-destructive:disabled{opacity:.4}.danger-zone{border:1px solid var(--danger);border-radius:var(--radius);padding:16px}select{border-radius:calc(var(--radius) - 2px);border:1px solid var(--border);background:var(--bg);min-height:36px;color:var(--text);padding:4px 8px}input[type=text],input[type=email],input[type=password]{border-radius:calc(var(--radius) - 2px);border:1px solid var(--border);background:var(--bg);width:100%;min-height:44px;color:var(--text);box-shadow:var(--shadow-sm);margin-bottom:12px;padding:10px 12px}.input-clearable-wrap{margin-bottom:12px;position:relative}.input-clearable-wrap input[type=text]{margin-bottom:0;padding-right:40px}.input-clear-btn{justify-content:center;align-items:center;display:none;position:absolute;top:0;bottom:0;right:2px}.input-inline-add{min-height:36px;margin-bottom:0}input[type=file]{width:100%;color:var(--text-muted);font-size:14px;display:block}input[type=file]::file-selector-button{border-radius:calc(var(--radius) - 2px);border:1px solid var(--border);background:var(--surface);min-height:44px;color:var(--text);box-shadow:var(--shadow-sm);cursor:pointer;margin-right:12px;padding:10px 16px;font-family:inherit;font-size:16px;font-weight:500}input[type=file]::file-selector-button:hover{opacity:.9}input[type=file]::file-selector-button:active{transform:scale(.98)}.field-error{color:var(--danger);margin:-8px 0 12px;font-size:14px}.muted{color:var(--text-muted);font-size:14px}.stat-tile{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);min-width:80px;box-shadow:var(--shadow-sm);text-align:center;flex:1;padding:12px;font-size:24px;font-weight:700}.stat-tile span{color:var(--text-muted);margin-top:2px;font-size:12px;font-weight:400;display:block}.list-item{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:12px 0;display:flex}.tag-chip{background:var(--surface);border:1px solid var(--border);cursor:pointer;border-radius:999px;align-items:center;margin:2px;padding:2px 10px;font-size:12px;font-weight:500;display:inline-flex}.tag-chip.selected{background:var(--accent);color:var(--accent-text);border-color:var(--accent)}#all-filter-chip{padding:3px 12px;font-size:14px}.session-summary-bar{background:var(--bg);border-radius:999px;width:100%;height:14px;margin:16px 0;display:flex;overflow:hidden}.session-summary-bar span{height:100%;display:block}.session-summary-bar .seg-win{background:var(--text)}.session-summary-bar .seg-mid{background:var(--text-muted)}.session-summary-bar .seg-low{background:var(--surface)}.session-summary-legend{flex-direction:column;gap:10px;margin:4px 0 8px;display:flex}.session-summary-row{justify-content:space-between;align-items:baseline;gap:12px;display:flex}.session-summary-label{color:var(--text-muted);align-items:center;gap:8px;font-size:13px;display:inline-flex}.session-summary-value{font-variant-numeric:tabular-nums;color:var(--text-muted);font-size:14px;font-weight:600}.session-summary-swatch{border-radius:2px;flex:none;width:8px;height:8px}.session-summary-swatch.seg-win{background:var(--text)}.session-summary-swatch.seg-mid{background:var(--text-muted)}.session-summary-swatch.seg-low{background:var(--surface)}.session-summary-row.is-primary .session-summary-label{color:var(--text);font-weight:600}.session-summary-row.is-primary .session-summary-value{color:var(--text);font-size:20px;font-weight:700}.tag-chip-remove{min-width:0;min-height:0;box-shadow:none;color:inherit;cursor:pointer;background:0 0;border:none;align-items:center;margin:0;padding:2px 4px;font-size:14px;display:inline-flex}nav.tabbar{border-top:1px solid var(--border);display:flex}nav.tabbar a{text-align:center;color:var(--text-muted);flex:1;padding:12px 0;font-size:13px;text-decoration:none}nav.tabbar a.active{color:var(--accent);font-weight:500}.card{border:1px solid var(--border);border-radius:calc(var(--radius) + 4px);box-shadow:var(--shadow-sm);text-align:center;cursor:pointer;min-height:320px;padding:24px;position:relative}.card-front{flex-direction:column;justify-content:center;align-items:center;gap:12px;min-height:272px;display:flex}.card-hanzi{font-family:var(--font-hanzi);font-size:64px;line-height:1}.card-pinyin{color:var(--text-muted);align-items:center;gap:6px;font-size:14px;display:inline-flex}.card-vocab-text{justify-content:center;align-items:baseline;gap:24px;margin-top:12px;font-size:22px;line-height:1.3;display:flex}.card-vocab-text-noto{font-family:Noto Sans SC,sans-serif;font-weight:500}.card-definition{font-size:16px}.stroke-target{border:1px solid var(--border);border-radius:calc(var(--radius) - 2px);background:var(--stroke-bg);display:inline-block;position:relative}.stroke-target>svg{z-index:1;position:relative}.stroke-grid{pointer-events:none;position:absolute;inset:0}.stroke-grid-line{border:0 dashed #ffffff26;display:block;position:absolute}.stroke-grid-h{border-top-width:1px;width:100%;top:50%;left:0}.stroke-grid-v{border-left-width:1px;height:100%;top:0;left:50%}.stroke-grid-d1{transform-origin:0 0;border-top-width:1px;width:141.5%;top:0;left:0;transform:rotate(45deg)}.stroke-grid-d2{transform-origin:100% 0;border-top-width:1px;width:141.5%;top:0;right:0;transform:rotate(-45deg)}.stroke-grid-option{border-radius:calc(var(--radius) + 1px);cursor:pointer;background:0 0;border:2px solid #0000;padding:4px;line-height:0}.stroke-grid-option-selected{border-color:var(--accent)}.stroke-diagram-grid{grid-template-columns:repeat(auto-fill,80px);justify-content:center;display:grid}.stroke-diagram-frame{margin:-1px 0 0 -1px}.stroke-diagram-index{z-index:2;color:var(--text-muted);pointer-events:none;background:#00000080;border-radius:3px;padding:1px 3px;font-size:10px;line-height:1;position:absolute;top:2px;right:4px}.flag-row{gap:12px;margin-top:16px;display:flex}.flag-row button{flex:1;justify-content:center;align-items:center;gap:4px;min-height:52px;font-size:28px;display:flex}.flag-row button.flag-toggle-active{background:var(--accent);color:var(--accent-text);border-color:var(--accent)}.flag-row.flag-row-compact{flex-wrap:wrap;gap:8px;margin-top:0}.flag-row.flag-row-compact button{border-radius:999px;flex:none;width:43px;height:27px;min-height:0;padding:0;font-size:15px}.progress-indicator{text-align:center;color:var(--text-muted);margin-bottom:8px}.icon-btn{border-radius:calc(var(--radius) - 2px);border:1px solid var(--border);background:var(--surface);min-width:44px;min-height:44px;color:var(--text);cursor:pointer;justify-content:center;align-items:center;padding:0;font-size:18px;display:inline-flex}.icon-btn[disabled]{opacity:.4;cursor:not-allowed}.icon-btn.btn-primary{background:var(--accent);color:var(--accent-text);border-color:var(--accent)}.icon-btn-sm{min-width:28px;min-height:28px;font-size:16px}.bare-icon-btn{min-width:30px;min-height:30px;color:var(--text);cursor:pointer;background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;padding:4px;font-size:22px;line-height:1;display:inline-flex}.bare-icon-btn[disabled]{opacity:.4;cursor:not-allowed}.audio-icon-btn{min-width:32px;min-height:32px;color:var(--text-muted);box-shadow:none;cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;padding:4px;font-size:22px;display:inline-flex}.audio-icon-btn[disabled]{opacity:.4;cursor:not-allowed}.modal-overlay{z-index:100;background:#0009;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.modal-content{background:var(--bg);border:1px solid var(--border);border-radius:calc(var(--radius) + 4px);text-align:center;width:100%;max-width:400px;max-height:85vh;padding:24px;position:relative;overflow-y:auto;box-shadow:0 10px 30px -5px #0003}.modal-close{min-width:36px;min-height:36px;font-size:16px;position:absolute;top:8px;right:8px}.definition-list{text-align:left;margin:12px 0;padding-left:20px}.definition-list li{margin-bottom:4px}