*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0e0e0f;--surface:#181819;--border:#2a2a2d;--text:#e8e6e0;--muted:#6b6b72;--accent:#d4c89a;--green:#3ddc84;--blue:#5b9cf6;--red:#f25f5c;--yellow:#f7c948;--font-ui:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif}html,body{background:var(--bg);height:100%;color:var(--text);font-family:var(--font-ui);font-size:13px;overflow:hidden}#app{flex-direction:column;height:100vh;padding-bottom:56px;display:flex;overflow:hidden}#tab-bar{background:var(--surface);border-top:1px solid var(--border);z-index:90;grid-template-columns:1fr 1fr;height:56px;display:grid;position:fixed;bottom:0;left:0;right:0}.tab-item{cursor:pointer;-webkit-tap-highlight-color:transparent;color:var(--muted);background:0 0;border:none;flex-direction:column;justify-content:center;align-items:center;font-size:0;transition:color .12s;display:flex}.tab-item.active{color:var(--accent)}.tab-item svg{stroke-width:2.2px;width:30px;height:30px}.tab-item .tab-icon-fill{fill:currentColor;width:30px;height:30px}#sidebar{background:var(--surface);scrollbar-width:thin;scrollbar-color:var(--border) transparent;flex-direction:column;flex:1;display:flex;overflow:hidden auto}#sidebar-header{display:none}#controls{z-index:10;background:var(--surface);border-bottom:1px solid var(--border);flex-direction:column;flex-shrink:0;gap:8px;padding:10px 14px;display:flex;position:sticky;top:0}#search-row{align-items:center;gap:8px;display:flex}#search{background:var(--bg);border:1px solid var(--border);color:var(--text);font-family:var(--font-ui);outline:none;flex:1;padding:8px 10px;font-size:14px;transition:border-color .15s}#search:focus{border-color:var(--accent)}#search::placeholder{color:#888894}#filter-panel{flex-direction:column;gap:8px;display:none}#filter-panel.open{display:flex}#grade-filter-row{align-items:center;gap:8px;padding:8px 4px;display:flex}.grade-end-label{text-align:center;letter-spacing:.04em;white-space:nowrap;border:1px solid #0000;border-radius:3px;flex-shrink:0;min-width:30px;margin:0 8px;padding:2px 5px;font-size:11px;font-weight:600}#grade-dual-range{flex:1;align-items:center;height:28px;display:flex;position:relative}#gdr-track{background:var(--border);pointer-events:none;border-radius:3px;height:6px;position:absolute;left:0;right:0}#gdr-fill{pointer-events:none;border-radius:3px;height:6px;position:absolute}.gdr-thumb{cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none;box-sizing:border-box;border:2px solid #ffffff40;border-radius:50%;width:20px;height:20px;position:absolute;top:50%;transform:translate(-50%,-50%);box-shadow:0 1px 4px #00000080}.gdr-thumb:active{cursor:grabbing}#sort-row{justify-content:flex-end;align-items:center;gap:5px;display:flex}#sort-label{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;white-space:nowrap;margin-right:2px;font-size:11px}#result-count{display:none}.sort-btn{color:var(--muted);font-family:var(--font-ui);cursor:pointer;text-transform:uppercase;letter-spacing:.06em;background:0 0;border:none;padding:2px 6px;font-size:11px;transition:color .12s}.sort-btn:hover,.sort-btn.active{color:var(--accent)}.sort-btn.active[data-dir=desc]:after{content:" ↓"}.sort-btn.active[data-dir=asc]:after{content:" ↑"}#filter-close-pill{cursor:pointer;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;background:0 0;border-radius:6px;justify-content:center;align-items:center;width:100%;height:28px;margin:8px 0 4px;transition:background .15s;display:flex}#filter-close-pill:hover{background:0 0}#filter-close-pill:hover 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var(--border);white-space:nowrap;flex-direction:column;justify-content:center;align-self:stretch;align-items:center;padding-right:10px;font-size:14px;font-weight:600;line-height:1;display:flex}.stars{color:var(--yellow);letter-spacing:0;font-size:13px}.problem-item{border-bottom:1px solid var(--border);cursor:pointer;align-items:center;gap:10px;padding:10px 14px;transition:background .1s;display:flex}.problem-item-content{flex:1;min-width:0}.problem-item:hover{background:#d4c89a0d}.problem-item.active{border-left:2px solid var(--accent);background:#d4c89a1a;padding-left:12px}.plus-btn{color:#9a99a0;cursor:pointer;-webkit-tap-highlight-color:transparent;width:30px;height:30px;font-size:22px;font-weight:500;line-height:1;font-family:var(--font-ui);background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;transition:color .12s;display:flex}.plus-btn:hover,.plus-btn:active{color:var(--accent)}#action-sheet-backdrop{z-index:200;display:none;position:fixed;inset:0}#action-sheet-backdrop.open{display:block}#action-sheet{z-index:201;background:#f7c948;border:1px solid #d4a800;border-radius:8px;flex-direction:column;width:auto;display:none;position:fixed;overflow:hidden;box-shadow:0 8px 32px #0009}#action-sheet.open{animation:.14s sheet-in;display:flex}@keyframes sheet-in{0%{opacity:0;transform:scale(.93)translateY(-4px)}to{opacity:1;transform:scale(1)translateY(0)}}.action-item{height:44px;font-family:var(--font-ui);color:#000;cursor:pointer;text-align:left;letter-spacing:.02em;-webkit-tap-highlight-color:transparent;white-space:nowrap;background:0 0;border:none;align-items:center;gap:10px;padding:0 14px;font-size:13px;font-weight:500;transition:background .1s;display:flex}.action-item:not(:last-child){border-bottom:1px solid #00000026}.action-item:hover{background:#0000001a}.action-item svg{color:#333;flex-shrink:0;width:16px;height:16px}#board-modal{z-index:100;justify-content:center;align-items:center;display:none;position:fixed;inset:0}#board-modal.open{animation:.22s modal-in;display:flex}@keyframes modal-in{0%{opacity:0}to{opacity:1}}#board-modal-backdrop{-webkit-backdrop-filter:blur(6px);background:#000000c7;position:absolute;inset:0}#board-modal-content{z-index:1;background:var(--bg);border:1px solid var(--border);border-radius:10px;flex-direction:column;align-items:center;width:min(680px,92vw);height:92vh;max-height:92vh;padding:10px 4px 8px;display:flex;position:relative;overflow:hidden}#board-modal-header{border-bottom:1px solid var(--border);flex-shrink:0;grid-template-columns:auto 1fr auto;align-items:center;gap:10px;width:100%;margin-bottom:2px;padding:10px 14px;display:grid}#board-modal-info{min-width:0}#info-name{font-family:var(--font-ui);letter-spacing:.01em;color:var(--text);font-size:14px;font-weight:500;line-height:1.3}#info-grade{letter-spacing:.04em;vertical-align:middle;border-radius:3px;margin-left:6px;padding:1px 7px;font-size:12px;font-weight:600;display:inline-block}#info-sub,#info-type{color:#b0aea8;margin-top:3px;font-size:13px;line-height:1.5}#board-close-btn{color:var(--accent);cursor:pointer;font-family:var(--font-ui);-webkit-tap-highlight-color:transparent;letter-spacing:.02em;white-space:nowrap;background:0 0;border:none;flex-shrink:0;align-items:center;gap:4px;padding:4px 0;font-size:13px;font-weight:500;display:flex}#board-close-btn svg{flex-shrink:0;width:16px;height:16px}#main{flex-direction:column;flex:1;justify-content:center;align-items:center;width:100%;display:flex;position:relative;overflow:hidden}#board-wrap{flex-direction:column;align-items:center;max-height:100%;display:flex;position:relative}#board-canvas{display:block}#col-labels-outer{padding-left:28px}#col-labels{color:var(--muted);letter-spacing:.04em;-webkit-user-select:none;user-select:none;grid-template-columns:repeat(11,1fr);margin-bottom:3px;font-size:13px;display:grid}#col-labels span{text-align:center}#col-labels span.lit,#row-labels span.lit{color:#fff;font-weight:600}#board-canvas-row{flex-direction:row;align-items:flex-start;display:flex}#row-labels{width:28px;color:var(--muted);letter-spacing:.02em;-webkit-user-select:none;user-select:none;flex-direction:column;flex-shrink:0;font-size:13px;display:flex;overflow:hidden}#row-labels span{flex-shrink:0;justify-content:flex-end;align-items:center;padding-right:5px;display:flex}#info-legend{text-align:right;flex-direction:column;gap:4px;font-size:11px;display:flex}.legend-item{justify-content:flex-end;align-items:center;gap:6px;display:flex}.legend-dot{border-radius:50%;flex-shrink:0;width:10px;height:10px}@media (width<=767px){#board-modal-content{border:none;border-radius:0;width:100%;max-width:100%;height:100%;max-height:100%;padding:0 4px 8px}#board-modal-content:before{content:none}#col-labels,#row-labels{font-size:13px}}#sidebar.hidden{display:none}#lists-page,#list-detail-page{background:var(--surface);scrollbar-width:thin;scrollbar-color:var(--border) transparent;flex-direction:column;flex:1;display:none;overflow:hidden auto}#lists-page.active,#list-detail-page.active{display:flex}#lists-controls{z-index:10;background:var(--surface);border-bottom:1px solid var(--border);flex-direction:column;flex-shrink:0;gap:8px;padding:10px 14px;display:flex;position:sticky;top:0}#lists-search-row{align-items:center;gap:8px;display:flex}#lists-search{background:var(--bg);border:1px solid var(--border);color:var(--text);font-family:var(--font-ui);outline:none;flex:1;padding:8px 10px;font-size:14px;transition:border-color .15s}#lists-search:focus{border-color:var(--accent)}#lists-search::placeholder{color:#888894}#lists-filter-panel{flex-direction:column;gap:8px;display:none}#lists-filter-panel.open{display:flex}.page-header{z-index:10;background:var(--surface);border-bottom:1px solid var(--border);flex-shrink:0;align-items:center;gap:10px;padding:14px 14px 12px;display:flex;position:sticky;top:0}.page-header-info{flex-direction:column;flex:1;gap:1px;min-width:0;display:flex}.page-title{color:var(--text);letter-spacing:.01em;flex-wrap:wrap;flex:1;align-items:center;gap:0;font-size:14px;font-weight:500;display:flex}.page-subtitle{color:#b0aea8;letter-spacing:.01em;font-size:13px}.back-btn{color:var(--accent);cursor:pointer;-webkit-tap-highlight-color:transparent;letter-spacing:.02em;background:0 0;border:none;align-items:center;gap:4px;padding:4px 0;font-size:13px;font-weight:500;display:flex}.back-btn svg{flex-shrink:0;width:16px;height:16px}.list-edit-btn{color:var(--muted);cursor:pointer;-webkit-tap-highlight-color:transparent;background:0 0;border:none;border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;padding:6px;transition:color .15s,background .15s;display:flex}.list-edit-btn:hover{color:var(--text);background:#ffffff12}#edit-list-modal{z-index:400;justify-content:center;align-items:center;display:none;position:fixed;inset:0}#edit-list-modal.open{display:flex}#edit-list-backdrop{background:#0009;position:absolute;inset:0}#edit-list-content{background:#2c2c30;border:1px solid #3e3e43;border-radius:12px;flex-direction:column;gap:14px;width:min(320px,88vw);padding:20px;display:flex;position:relative;box-shadow:0 8px 32px #00000080}.edit-list-heading{color:var(--text);text-transform:uppercase;letter-spacing:.08em;font-size:14px;font-weight:600}.edit-list-field{flex-direction:column;gap:5px;display:flex}.edit-list-label{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;font-size:11px}#edit-list-name,#edit-list-desc{border:1px solid var(--border);color:var(--text);font-family:var(--font-ui);box-sizing:border-box;background:#ffffff0d;border-radius:6px;outline:none;width:100%;padding:9px 10px;font-size:14px;transition:border-color .15s}#edit-list-name:focus,#edit-list-desc:focus{border-color:var(--accent)}#edit-list-desc{resize:none;line-height:1.5}.edit-list-btns{justify-content:flex-end;gap:8px;display:flex}.edit-list-btn{border:1px solid var(--border);color:var(--text);font-family:var(--font-ui);cursor:pointer;background:0 0;border-radius:6px;padding:7px 18px;font-size:13px;transition:background .12s}.edit-list-btn:hover{background:#ffffff0f}.edit-list-btn.save{border-color:var(--accent);color:var(--accent)}.edit-list-btn.save:hover{background:#d4c89a1a}#list-detail-title{text-transform:uppercase}.list-detail-desc-display{color:#b0aea8;white-space:pre-wrap;word-break:break-word;margin-top:2px;font-size:12px;font-style:italic;line-height:1.5}#confirm-remove-modal{z-index:300;justify-content:center;align-items:center;display:none;position:fixed;inset:0}#confirm-remove-modal.open{display:flex}#confirm-remove-backdrop{background:#0000008c;position:absolute;inset:0}#confirm-remove-content{background:var(--surface);border-radius:12px;flex-direction:column;gap:14px;width:min(300px,90vw);padding:20px 20px 16px;display:flex;position:relative;box-shadow:0 8px 32px #00000080}#confirm-remove-title{color:var(--text);font-size:15px;font-weight:600;line-height:1.4}#confirm-remove-name{color:var(--accent);font-weight:400}#confirm-remove-check-row{cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:8px;display:flex}#confirm-remove-check-row input[type=checkbox]{width:16px;height:16px;accent-color:var(--accent);cursor:pointer;flex-shrink:0}#confirm-remove-check-label{color:var(--muted);font-size:12px}#confirm-remove-btns{justify-content:flex-end;gap:8px;display:flex}.confirm-remove-btn{border:1px solid var(--border);color:var(--text);font-family:var(--font-ui);cursor:pointer;background:0 0;border-radius:6px;padding:7px 16px;font-size:13px;transition:background .12s}.confirm-remove-btn:hover{background:#ffffff0f}.confirm-remove-btn.danger{color:#e74c3c;border-color:#c0392b}.confirm-remove-btn.danger:hover{background:#e74c3c1a}.list-card{border-bottom:1px solid var(--border);cursor:pointer;-webkit-tap-highlight-color:transparent;align-items:center;gap:10px;padding:10px 14px;transition:background .1s;display:flex}.list-card:hover{background:#d4c89a0d}.list-card-info{flex:1;min-width:0}.list-card-name{color:var(--text);letter-spacing:.01em;text-transform:uppercase;flex-wrap:wrap;align-items:center;gap:0;font-size:14px;font-weight:500;line-height:1.3;display:flex}.list-card-meta{color:#b0aea8;margin-top:2px;font-size:13px}.list-card-chevron{color:var(--muted);flex-shrink:0;margin-left:8px}.list-card-chevron svg{width:16px;height:16px;display:block}.list-problem-row{border-bottom:1px solid var(--border);cursor:pointer;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none;align-items:center;gap:10px;padding:10px 14px;transition:background .1s;display:flex}.list-problem-row:hover{background:#d4c89a0d}.list-problem-row.drag-over{background:#d4c89a00}.list-problem-row.dragging{opacity:1;background:#d4c89a2e;box-shadow:0 2px 10px #0006}.list-problem-row .problem-item-content{flex:1;min-width:0}.drag-handle{width:24px;height:30px;color:var(--muted);cursor:grab;opacity:.5;touch-action:none;flex-shrink:0;justify-content:center;align-items:center;display:flex}.drag-handle:active{cursor:grabbing}.drag-handle svg{width:16px;height:16px}.list-remove-btn{width:30px;height:30px;color:var(--muted);cursor:pointer;-webkit-tap-highlight-color:transparent;background:0 0;border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:20px;transition:color .12s,background .12s;display:flex}.list-remove-btn:hover{color:var(--red);background:#f25f5c1a}.empty-state{text-align:center;color:var(--muted);flex-direction:column;flex:1;justify-content:center;align-items:center;padding:56px 24px;display:flex}.empty-state svg{opacity:.35;width:48px;height:48px;margin-bottom:14px}.empty-state-msg{max-width:220px;font-size:13px;line-height:1.6}#list-selector-backdrop{z-index:300;background:#0000008c;display:none;position:fixed;inset:0}#list-selector-backdrop.open{display:block}#list-selector-sheet{z-index:301;background:var(--surface);border-top:1px solid var(--border);border-radius:16px 16px 0 0;flex-direction:column;max-height:74vh;padding-bottom:28px;transition:transform .28s cubic-bezier(.32,.94,.6,1);display:flex;position:fixed;bottom:0;left:0;right:0;transform:translateY(100%)}#list-selector-sheet.open{transform:translateY(0)}.sheet-pill{background:var(--border);border-radius:2px;flex-shrink:0;width:36px;height:4px;margin:10px auto 0}.list-selector-header{border-bottom:1px solid var(--border);flex-shrink:0;justify-content:space-between;align-items:center;padding:12px 16px 10px;display:flex}.list-selector-title{color:var(--muted);text-transform:uppercase;letter-spacing:.08em;font-size:11px;font-weight:600}.sheet-close-btn{color:var(--muted);cursor:pointer;-webkit-tap-highlight-color:transparent;background:0 0;border:none;padding:0 2px;font-size:22px;line-height:1}#list-selector-items{overflow-y:auto}.list-sel-item{cursor:pointer;-webkit-tap-highlight-color:transparent;border-bottom:1px solid #2a2a2db3;align-items:center;gap:12px;padding:13px 16px;transition:background .1s;display:flex}.list-sel-item:hover{background:#d4c89a0d}.list-check{border:2px solid #ffffff59;border-radius:5px;flex-shrink:0;justify-content:center;align-items:center;width:22px;height:22px;transition:all .15s;display:flex;position:relative}.list-check.on{background:var(--accent);border-color:var(--accent)}.list-check.on:after{content:"";border:2.2px solid #111;border-top:none;border-left:none;width:5px;height:9px;display:block;transform:rotate(42deg)translate(-1px,-1px)}.list-sel-name{color:var(--text);flex:1;font-size:14px;font-weight:500}.list-sel-count{color:var(--muted);font-size:12px}.list-sel-create{cursor:pointer;-webkit-tap-highlight-color:transparent;flex-shrink:0;align-items:center;gap:12px;padding:13px 16px;transition:background .1s;display:flex}.list-sel-create:hover{background:#d4c89a0d}.list-create-icon{border:2px solid var(--accent);width:22px;height:22px;color:var(--accent);border-radius:5px;flex-shrink:0;justify-content:center;align-items:center;padding-bottom:1px;font-size:17px;font-weight:300;line-height:1;display:flex}.list-sel-create-label{color:var(--accent);font-size:14px;font-weight:500}#create-list-modal{z-index:400;justify-content:center;align-items:center;display:none;position:fixed;inset:0}#create-list-modal.open{animation:.18s modal-in;display:flex}#create-list-backdrop{background:#000000b8;position:absolute;inset:0}#create-list-content{z-index:1;background:#2c2c30;border:1px solid #3e3e43;border-radius:12px;flex-direction:column;width:min(320px,88vw);max-height:72vh;padding:20px 0 0;display:flex;position:relative;overflow:hidden}.create-list-heading{color:var(--text);flex-shrink:0;margin-bottom:12px;padding:0 18px;font-size:15px;font-weight:600}#add-to-list-items{flex:1;min-height:0;overflow-y:auto}.add-to-list-item{cursor:pointer;-webkit-tap-highlight-color:transparent;border-top:1px solid #3e3e43;align-items:center;gap:11px;padding:12px 18px;transition:background .1s;display:flex}.add-to-list-item:first-child{border-top:none}.add-to-list-item:hover{background:#ffffff0f}.add-to-list-item .list-check{flex-shrink:0}.add-to-list-item-name{color:var(--text);flex:1;font-size:14px;font-weight:400}.add-to-list-item-name.on{font-weight:600}.add-to-list-item-count{color:var(--muted);flex-shrink:0;font-size:14px;font-weight:400}.add-to-list-item-count.on{color:var(--text);font-weight:700}#add-to-create-row{border-top:1px solid #3e3e43;flex-shrink:0;align-items:center;gap:8px;padding:12px 14px;display:flex}#new-list-name-input{color:var(--text);font-family:var(--font-ui);box-sizing:border-box;background:#1e1e21;border:1px solid #3e3e43;border-radius:6px;outline:none;flex:1;padding:7px 10px;font-size:13px;transition:border-color .15s}#new-list-name-input:focus{border-color:var(--accent)}.create-list-actions{flex-shrink:0;justify-content:flex-end;gap:8px;padding:0 18px 18px;display:flex}.cl-btn{font-family:var(--font-ui);cursor:pointer;-webkit-tap-highlight-color:transparent;white-space:nowrap;border:none;border-radius:7px;flex-shrink:0;padding:7px 16px;font-size:13px;font-weight:500;transition:opacity .12s}.cl-btn:active{opacity:.75}.cl-btn.cancel{border:1px solid var(--border);color:var(--muted);background:0 0}.cl-btn.confirm{background:var(--accent);color:#000}#loading{background:var(--bg);font-family:var(--font-ui);letter-spacing:.1em;color:var(--muted);z-index:10;justify-content:center;align-items:center;font-size:28px;transition:opacity .4s;display:flex;position:fixed;inset:0}#loading.done{opacity:0;pointer-events:none}.bm-badge{color:#000;vertical-align:middle;background:#fff;border-radius:9px;flex-shrink:0;justify-content:center;align-items:center;height:18px;margin-left:4px;padding:0 6px;font-size:10px;font-weight:700;line-height:1;display:inline-flex}.grade-plus{vertical-align:2.5px;font-size:1em;line-height:0;font-weight:inherit}