.sidebar{position:relative;width:232px;flex:none;display:flex;flex-direction:column;background:var(--bg-sidebar);backdrop-filter:saturate(180%) blur(24px);-webkit-backdrop-filter:saturate(180%) blur(24px);border-right:1px solid var(--separator);overflow:hidden}.sidebar-drag{height:30px;flex:none;-webkit-app-region:drag}.brand{display:flex;align-items:center;gap:10px;padding:4px 16px 16px}.brand-mark{width:32px;height:32px;flex:none;border-radius:9px;display:grid;place-items:center;font-size:13px;font-weight:700;letter-spacing:-.02em;color:#fff;background:linear-gradient(145deg,var(--sys-blue),var(--sys-indigo));box-shadow:0 2px 8px color-mix(in srgb,var(--sys-blue) 35%,transparent)}.brand-text{min-width:0}.brand-name{font-size:14px;font-weight:600;letter-spacing:-.01em}.brand-sub{font-size:11.5px;color:var(--text-secondary);font-variant-numeric:tabular-nums}.nav{padding:0 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.15s}.cat-item:hover{background:var(--bg-hover)}.cat-item.is-on{background:var(--bg-fill);color:var(--text-primary);font-weight:550}.cat-dot{width:6px;height:6px;flex:none;border-radius:50%;background:var(--text-tertiary);transition:background .15s,transform .2s var(--ease-spring)}.cat-item.is-on .cat-dot{background:var(--sys-blue);transform:scale(1.25)}.cat-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.cat-count{flex:none;font-size:11px;color:var(--text-tertiary);font-variant-numeric:tabular-nums}@media(max-width:880px){.sidebar{width:60px}.brand-text,.nav-label,.cat-section{display:none}.brand{justify-content:center;padding:4px 0 16px}.nav-item{justify-content:center;padding:0}.nav-badge{position:absolute;margin-left:22px;margin-top:-14px}.nav-item{position:relative}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;border-radius:var(--r-sm);font-weight:510;letter-spacing:-.01em;cursor:pointer;white-space:nowrap;transition:background .15s var(--ease-out),transform .12s var(--ease-out),opacity .15s var(--ease-out),box-shadow .15s var(--ease-out)}.btn:active:not(:disabled){transform:scale(.97)}.btn:disabled{opacity:.4;cursor:default}.btn-icon{display:inline-flex;font-size:1.05em;line-height:1}.btn-sm{height:26px;padding:0 10px;font-size:12.5px;border-radius:var(--r-xs)}.btn-md{height:32px;padding:0 14px;font-size:13.5px}.btn-lg{height:40px;padding:0 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- 2px);box-shadow:var(--shadow-sm);transition:transform .28s var(--ease-out);z-index:-1}.seg-item{border:none;background:none;cursor:pointer;font-weight:510;color:var(--text-secondary);transition:color .2s var(--ease-out);white-space:nowrap;flex:1}.seg-item.is-active{color:var(--text-primary)}.seg-md .seg-item{height:28px;padding:0 14px;font-size:13px}.seg-sm .seg-item{height:24px;padding:0 10px;font-size:12px}.switch{position:relative;width:50px;height:30px;flex:none;border:none;border-radius:var(--r-full);background:var(--bg-fill-strong);cursor:pointer;padding:0;transition:background .25s var(--ease-out)}.switch.is-on{background:var(--sys-green)}.switch-knob{position:absolute;top:2px;left:2px;width:26px;height:26px;border-radius:50%;background:#fff;box-shadow:0 2px 5px #0003;transition:transform .25s var(--ease-out)}.switch.is-on .switch-knob{transform:translate(20px)}.slider-wrap{display:flex;align-items:center;gap:10px;min-width:160px}.slider{-webkit-appearance:none;appearance:none;flex:1;height:4px;border-radius:var(--r-full);background:linear-gradient(to right,var(--sys-blue) 0%,var(--sys-blue) var(--pct),var(--bg-fill-strong) var(--pct),var(--bg-fill-strong) 100%);cursor:pointer}.slider::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:#fff;box-shadow:0 1px 4px #00000047,0 0 0 .5px #0000001a;cursor:grab}.slider::-webkit-slider-thumb:active{cursor:grabbing;transform:scale(1.1)}.slider-val{font-size:12.5px;color:var(--text-secondary);font-variant-numeric:tabular-nums;min-width:46px;text-align:right}.row{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:11px 0;border-bottom:1px solid var(--separator)}.row:last-child{border-bottom:none}.row-text{min-width:0}.row-label{font-size:14px;font-weight:500}.row-hint{font-size:12.5px;color:var(--text-secondary);margin-top:2px;line-height:1.45}.row-control{flex:none;display:flex;align-items:center;gap:8px}.card{background:var(--bg-elevated);border-radius:var(--r-lg);box-shadow:var(--shadow-sm);overflow:hidden;margin-bottom:18px}.card-title{margin:0;padding:14px 18px 10px;font-size:13px;font-weight:600;color:var(--text-secondary);letter-spacing:.02em;text-transform:uppercase}.card-body{padding:0 18px 6px}.card-title+.card-body{padding-top:0}.card-body:first-child{padding-top:14px}.card-footer{padding:12px 18px;border-top:1px solid var(--separator);background:var(--bg-fill)}.tag{display:inline-flex;align-items:center;padding:2px 8px;border-radius:var(--r-full);font-size:11.5px;font-weight:550;color:var(--tag-color);background:color-mix(in srgb,var(--tag-color) 14%,transparent);white-space:nowrap}.modal-backdrop{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:24px;background:#00000052;backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px);animation:fadeIn .18s var(--ease-out)}.modal{width:100%;max-height:82vh;display:flex;flex-direction:column;background:var(--bg-elevated);border-radius:var(--r-xl);box-shadow:var(--shadow-lg);animation:popIn .24s var(--ease-out);overflow:hidden}.modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;border-bottom:1px solid var(--separator)}.modal-head h2{margin:0;font-size:16px;font-weight:600;letter-spacing:-.01em}.modal-close{border:none;background:var(--bg-fill);width:26px;height:26px;border-radius:50%;cursor:pointer;color:var(--text-secondary);font-size:12px;display:grid;place-items:center;transition:background .15s}.modal-close:hover{background:var(--bg-fill-strong)}.modal-body{padding:18px;overflow-y:auto}.empty{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;padding:64px 24px;text-align:center;color:var(--text-secondary);animation:fadeUp .35s var(--ease-out)}.empty-icon{font-size:44px;opacity:.55;margin-bottom:4px}.empty-title{font-size:16px;font-weight:600;color:var(--text-primary)}.empty-desc{font-size:13.5px;max-width:380px;line-height:1.6}.empty-action{margin-top:12px}.ring{position:relative;display:grid;place-items:center;flex:none}.ring svg{position:absolute;inset:0}.ring-label{position:relative;font-size:11px;font-weight:620;font-variant-numeric:tabular-nums;color:var(--text-primary)}.practice{display:flex;flex-direction:column;height:100%;min-width:0;position:relative}.toolbar{flex:none;background:var(--bg-sidebar);backdrop-filter:saturate(180%) blur(24px);-webkit-backdrop-filter:saturate(180%) blur(24px);border-bottom:1px solid var(--separator)}.toolbar-drag{height:26px;-webkit-app-region:drag}.toolbar-inner{display:flex;align-items:center;gap:12px;padding:0 18px 12px;flex-wrap:wrap}.toolbar-spacer{flex:1;min-width:8px}.timer{font-variant-numeric:tabular-nums;font-size:13px;font-weight:550;color:var(--text-secondary);padding:5px 10px;border-radius:var(--r-xs);background:var(--bg-fill);letter-spacing:.02em}.tool-group{display:flex;gap:2px}.icon-btn{width:30px;height:30px;border:none;border-radius:var(--r-xs);background:transparent;color:var(--text-secondary);font-size:15px;cursor:pointer;display:grid;place-items:center;transition:background .15s,color .15s,transform .15s var(--ease-spring)}.icon-btn:hover:not(:disabled){background:var(--bg-fill);color:var(--text-primary)}.icon-btn:active:not(:disabled){transform:scale(.9)}.icon-btn:disabled{opacity:.3;cursor:default}.icon-btn.is-on{color:var(--sys-orange);background:color-mix(in srgb,var(--sys-orange) 14%,transparent)}.split{flex:1;min-height:0;display:grid;grid-template-columns:calc(var(--ratio) * 100%) 0px 1fr}.pane{display:flex;flex-direction:column;min-width:0;min-height:0;overflow:hidden}.pane-q{background:var(--bg-base)}.pane-a{background:var(--bg-elevated);border-left:1px solid var(--separator)}.pane-head{flex:none;display:flex;align-items:center;gap:10px;padding:14px 24px 8px}.pane-tag{font-size:11px;font-weight:640;letter-spacing:.06em;text-transform:uppercase;color:var(--text-tertiary)}.pane-crumb{font-size:11.5px;color:var(--text-tertiary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}.pane-mini{margin-left:auto;border:none;background:none;color:var(--sys-blue);font-size:12px;cursor:pointer;padding:0}.pane-mini:hover{text-decoration:underline}.pane-scroll{flex:1;min-height:0;overflow-y:auto;padding:6px 24px 32px;position:relative}.q-title{margin:4px 0 14px;font-size:clamp(20px,2.2vw,27px);font-weight:640;line-height:1.38;letter-spacing:-.02em;animation:fadeUp .32s var(--ease-out)}.q-meta{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin-bottom:12px;animation:fadeUp .4s var(--ease-out)}.q-meta-dim{font-size:11.5px;color:var(--text-tertiary);margin-left:2px}.q-history{font-size:12px;color:var(--text-secondary);padding:8px 12px;background:var(--bg-fill);border-radius:var(--r-sm);margin-bottom:12px;font-variant-numeric:tabular-nums}.pool-hint{margin-top:20px;padding-top:14px;border-top:1px solid var(--separator);font-size:11.5px;color:var(--text-tertiary);font-variant-numeric:tabular-nums}.note-box{margin-bottom:12px;animation:fadeUp .2s var(--ease-out)}.note-input{width:100%;padding:10px 12px;border:1px solid var(--separator-opaque);border-radius:var(--r-sm);background:var(--bg-elevated);color:var(--text-primary);font-family:inherit;font-size:13.5px;line-height:1.6;resize:vertical}.note-input:focus{outline:none;border-color:var(--sys-blue);box-shadow:0 0 0 3px color-mix(in srgb,var(--sys-blue) 18%,transparent)}.note-actions{display:flex;justify-content:flex-end;gap:6px;margin-top:6px}.note-view{margin-bottom:12px;padding:10px 12px;border-left:3px solid var(--sys-yellow);background:color-mix(in srgb,var(--sys-yellow) 10%,transparent);border-radius:0 var(--r-sm) var(--r-sm) 0;font-size:13px;line-height:1.65;white-space:pre-wrap}.note-view-label{display:block;font-size:10.5px;font-weight:640;letter-spacing:.05em;text-transform:uppercase;color:var(--text-tertiary);margin-bottom:4px}.split-handle{position:relative;width:0;cursor:col-resize;z-index:5}.split-handle span{position:absolute;top:0;bottom:0;left:-4px;width:9px;transition:background .15s}.split-handle:hover span{background:color-mix(in srgb,var(--sys-blue) 25%,transparent)}.answer{animation:fadeUp .35s var(--ease-out)}.answer.is-hidden{filter:blur(9px);opacity:.42;pointer-events:none;user-select:none;transition:filter .35s var(--ease-out),opacity .35s var(--ease-out)}.cover{position:absolute;inset:0;border:none;background:transparent;cursor:pointer;display:grid;place-items:center;padding:24px}.cover-inner{display:flex;flex-direction:column;align-items:center;gap:5px;padding:26px 34px;border-radius:var(--r-xl);background:var(--bg-elevated);box-shadow:var(--shadow-md);transition:transform .25s var(--ease-spring),box-shadow .25s var(--ease-out);animation:popIn .3s var(--ease-out)}.cover:hover .cover-inner{transform:translateY(-2px) scale(1.02);box-shadow:var(--shadow-lg)}.cover:active .cover-inner{transform:scale(.99)}.cover-icon{font-size:30px;margin-bottom:2px}.cover-title{font-size:15px;font-weight:600;letter-spacing:-.01em}.cover-desc{font-size:12.5px;color:var(--text-secondary);display:flex;align-items:center;gap:5px}.gradebar{flex:none;display:flex;align-items:center;gap:14px;padding:12px 24px;border-top:1px solid var(--separator);background:var(--bg-sidebar);backdrop-filter:saturate(180%) blur(24px);-webkit-backdrop-filter:saturate(180%) blur(24px)}.gradebar-label{font-size:13px;color:var(--text-secondary);flex:none}.grade-btns{display:flex;gap:8px;flex:1;max-width:520px}.grade{flex:1;display:flex;flex-direction:column;align-items:center;gap:1px;padding:7px 10px;border:none;border-radius:var(--r-md);cursor:pointer;background:var(--bg-fill);color:var(--text-primary);transition:background .15s,transform .12s var(--ease-out),box-shadow .15s;position:relative}.grade:hover{transform:translateY(-1px);box-shadow:var(--shadow-sm)}.grade:active{transform:scale(.97)}.grade-key{position:absolute;top:4px;left:7px;font-size:9.5px;font-weight:700;opacity:.45;font-variant-numeric:tabular-nums}.grade-text{font-size:13.5px;font-weight:600}.grade-sub{font-size:10.5px;opacity:.62}.grade-0:hover{background:color-mix(in srgb,var(--sys-red) 18%,transparent);color:var(--sys-red)}.grade-1:hover{background:color-mix(in srgb,var(--sys-orange) 18%,transparent);color:var(--sys-orange)}.grade-2:hover{background:color-mix(in srgb,var(--sys-green) 18%,transparent);color:var(--sys-green)}.hints{margin-top:14px;display:flex;flex-direction:column;gap:5px;font-size:11px;line-height:1.7;color:var(--text-tertiary);pointer-events:none}.hints>div{display:flex;align-items:center;gap:4px;flex-wrap:wrap}kbd{display:inline-grid;place-items:center;min-width:18px;height:18px;padding:0 4px;border-radius:4px;background:var(--bg-fill-strong);font-family:var(--font-ui);font-size:10.5px;font-weight:600;color:var(--text-secondary)}@media(max-width:820px){.split{grid-template-columns:1fr;grid-template-rows:minmax(160px,auto) 0 1fr}.pane-a{border-left:none;border-top:1px solid var(--separator)}.split-handle{display:none}.gradebar{flex-wrap:wrap}}.src-empty{padding:16px 0;font-size:13px;color:var(--text-tertiary);text-align:center}.src-item{display:flex;align-items:center;gap:11px;padding:9px 0;border-bottom:1px solid var(--separator)}.src-item:last-of-type{border-bottom:none}.src-icon{font-size:19px;flex:none}.src-text{flex:1;min-width:0}.src-name{font-size:13.5px;font-weight:520;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.src-meta{font-size:11.5px;color:var(--text-secondary);font-variant-numeric:tabular-nums}.src-actions{display:flex;gap:8px;flex-wrap:wrap;padding:14px 0 12px;border-top:1px solid var(--separator);margin-top:4px}.src-item+.src-actions{margin-top:8px}.lib-toolbar{display:flex;align-items:center;gap:10px;margin:22px 0 10px;flex-wrap:wrap}.search{flex:1;min-width:180px;height:32px;padding:0 12px;border:1px solid var(--separator-opaque);border-radius:var(--r-sm);background:var(--bg-elevated);color:var(--text-primary);font-family:inherit;font-size:13.5px}.search::placeholder{color:var(--text-tertiary)}.search:focus{outline:none;border-color:var(--sys-blue);box-shadow:0 0 0 3px color-mix(in srgb,var(--sys-blue) 18%,transparent)}.lib-count{font-size:11.5px;color:var(--text-tertiary);margin-bottom:8px;font-variant-numeric:tabular-nums}.lib-more{padding:14px;text-align:center;font-size:12px;color:var(--text-tertiary)}.qlist{background:var(--bg-elevated);border-radius:var(--r-lg);box-shadow:var(--shadow-sm);overflow:hidden}.qrow{display:flex;align-items:center;gap:4px;padding:4px 12px 4px 6px;border-bottom:1px solid var(--separator);transition:background .12s}.qrow:last-child{border-bottom:none}.qrow:hover{background:var(--bg-hover)}.qrow-star{flex:none;width:28px;height:28px;border:none;background:none;cursor:pointer;color:var(--text-tertiary);font-size:14px;border-radius:var(--r-xs);transition:color .15s,transform .15s var(--ease-spring)}.qrow-star:hover{transform:scale(1.15)}.qrow-star.is-on{color:var(--sys-orange)}.qrow-main{flex:1;min-width:0;border:none;background:none;cursor:pointer;text-align:left;padding:8px 4px;color:inherit}.qrow-title{font-size:13.5px;font-weight:500;line-height:1.4;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.qrow-meta{display:flex;align-items:center;gap:5px;margin-top:3px;font-size:11.5px;color:var(--text-tertiary);overflow:hidden;white-space:nowrap}.preview-crumb{font-size:11.5px;color:var(--text-tertiary);margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--separator)}.preview-actions{display:flex;justify-content:flex-end;margin-top:20px;padding-top:14px;border-top:1px solid var(--separator)}.parse-result{margin:4px 0 12px;padding:9px 12px;border-radius:var(--r-sm);background:var(--bg-fill);font-size:12.5px;line-height:1.6;color:var(--text-secondary)}.parse-result.is-warn{background:color-mix(in srgb,var(--sys-orange) 13%,transparent);color:var(--sys-orange)}.mock-scope{font-size:13px;color:var(--text-secondary);max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.hist-row{display:flex;align-items:center;gap:10px;padding:8px 0;border-bottom:1px solid var(--separator);font-size:12.5px}.hist-row:last-child{border-bottom:none}.hist-date{flex:none;width:96px;color:var(--text-secondary);font-variant-numeric:tabular-nums}.hist-bar{flex:1;height:6px;border-radius:var(--r-full);background:var(--bg-fill);overflow:hidden}.hist-fill{height:100%;background:var(--sys-green);border-radius:var(--r-full);transition:width .4s 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