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(hover:hover){.accordion-header:hover{background:var(--bg-tertiary)}}.accordion-header.open{background:var(--bg-tertiary);border-bottom-color:#0000;border-bottom-right-radius:0;border-bottom-left-radius:0}.accordion-chevron{color:var(--text-tertiary);flex-shrink:0;transition:transform .2s}.accordion-title{font-weight:700;font-size:var(--font-sm);white-space:nowrap;text-overflow:ellipsis;flex:1;min-width:0;overflow:hidden}.accordion-count{font-size:var(--font-xs);color:var(--text-secondary);text-align:right;flex-shrink:0;min-width:45px;font-weight:600}.accordion-progress{background:var(--bg-primary);border-radius:2px;flex-shrink:0;width:120px;height:4px;overflow:hidden}@media (max-width:480px){.accordion-progress{width:60px}}.accordion-progress-fill{border-radius:2px;height:100%;transition:width .3s}.accordion-body{border:1px solid var(--border-color);border-bottom-left-radius:var(--radius-md);border-bottom-right-radius:var(--radius-md);background:var(--bg-card);border-top:none;overflow-x:auto}.accordion-table-header{padding:8px var(--space-md);border-bottom:1px solid var(--border-color);text-transform:uppercase;letter-spacing:.5px;color:var(--text-tertiary);background:var(--bg-tertiary);align-items:center;min-width:500px;font-size:11px;font-weight:700;display:flex}.accordion-row{padding:10px var(--space-md);border-bottom:1px solid var(--border-color);align-items:center;display:flex}@supports (color:color-mix(in lab, red, red)){.accordion-row{border-bottom:1px solid color-mix(in srgb,var(--border-color)50%,transparent)}}.accordion-row{cursor:pointer;-webkit-user-select:none;user-select:none;min-width:500px;transition:background .15s,transform .1s}.accordion-row:last-child{border-bottom:none}.accordion-row:active{background:var(--accent-bg);transform:scale(.985)}@media (hover:hover){.accordion-row:hover{background:var(--bg-tertiary)}}.accordion-row.solved{background:var(--success)}@supports (color:color-mix(in lab, red, red)){.accordion-row.solved{background:color-mix(in srgb,var(--success)4%,transparent)}}.accordion-row.solved:active{background:var(--success)}@supports (color:color-mix(in lab, red, red)){.accordion-row.solved:active{background:color-mix(in srgb,var(--success)12%,transparent)}}@media (hover:hover){.accordion-row.solved:hover{background:var(--success)}@supports (color:color-mix(in lab, red, red)){.accordion-row.solved:hover{background:color-mix(in srgb,var(--success)8%,transparent)}}}.atcol-status{flex-shrink:0;justify-content:center;width:50px;display:flex}.atcol-star{flex-shrink:0;justify-content:center;width:40px;display:flex}.atcol-problem{flex:1;align-items:center;gap:6px;min-width:0;display:flex}.atcol-difficulty{text-align:center;flex-shrink:0;width:80px}.atcol-solution{flex-shrink:0;justify-content:center;width:60px;display:flex}.status-checkbox{cursor:pointer;background:0 0;border:none;align-items:center;padding:2px;transition:transform .15s;display:flex}.status-checkbox:active{transform:scale(.85)}.problem-title{font-size:var(--font-sm);color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;font-weight:500;overflow:hidden}.external-link-icon{color:var(--text-tertiary);opacity:.5;flex-shrink:0;transition:opacity .15s}.external-link-icon:hover{opacity:1;color:var(--accent)}.sortable{cursor:pointer;-webkit-user-select:none;user-select:none}.sortable:hover{color:var(--text-primary)}.solution-btn{cursor:pointer;color:var(--text-tertiary);background:0 0;border:none;align-items:center;padding:4px;transition:color .15s;display:flex}.solution-btn:hover{color:var(--accent)}.view-toggle{background:var(--bg-tertiary);border-radius:var(--radius-md);gap:2px;padding:2px;display:flex}.view-toggle button{border-radius:var(--radius-sm);font-size:var(--font-xs);color:var(--text-tertiary);cursor:pointer;background:0 0;border:none;padding:6px 12px;font-family:inherit;font-weight:600;transition:all .15s}.view-toggle button.active{background:var(--bg-card);color:var(--text-primary);box-shadow:0 1px 3px #0000001a}.problem-title,.accordion-row,.accordion-header,.status-checkbox,.solution-btn,.external-link-icon,.pd-action-btn,.pd-back-btn,.pd-status-btn,.pd-tab,.card[role=button],.card[onclick]{-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;outline:none}.accordion-row:focus,.accordion-row a:focus,.external-link-icon:focus{color:inherit;outline:none}.accordion-row a{color:inherit;text-decoration:none}.problem-detail-page{padding-bottom:calc(var(--nav-height) + var(--safe-bottom) + 32px)}.pd-hero{margin:calc(-1*var(--space-xl))calc(-1*var(--space-lg))0;padding:var(--space-lg)var(--space-lg)var(--space-xl);background:linear-gradient(180deg,var(--diff-color)0%,var(--bg-primary)100%)}@supports (color:color-mix(in lab, red, red)){.pd-hero{background:linear-gradient(180deg,color-mix(in srgb,var(--diff-color)6%,var(--bg-primary))0%,var(--bg-primary)100%)}}.pd-hero{border-bottom:1px solid var(--border-color);margin-bottom:var(--space-lg)}.pd-topbar{margin-bottom:var(--space-lg);justify-content:space-between;align-items:center;display:flex}.pd-topbar-actions{align-items:center;gap:4px;display:flex}.pd-back-btn,.pd-action-btn{border-radius:var(--radius-sm);width:36px;height:36px;color:var(--text-secondary);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;transition:background .15s,color .15s;display:flex}.pd-back-btn:hover,.pd-action-btn:hover{background:var(--bg-tertiary);color:var(--text-primary)}.pd-back-btn:active,.pd-action-btn:active{transform:scale(.9)}.pd-title{font-size:var(--font-xl);margin-bottom:var(--space-md);letter-spacing:-.3px;font-weight:800;line-height:1.3}.pd-meta{align-items:center;gap:var(--space-sm);flex-wrap:wrap;display:flex}.pd-diff-badge{font-size:var(--font-xs);border-radius:var(--radius-full);background:currentColor;padding:2px 10px;font-weight:700}@supports (color:color-mix(in lab, red, red)){.pd-diff-badge{background:color-mix(in srgb,currentColor 10%,transparent)}}.pd-topic-badge{font-size:var(--font-xs);color:var(--text-secondary);font-weight:500}.pd-pattern-badge{border-radius:var(--radius-full);background:var(--accent-bg);color:var(--accent);padding:2px 8px;font-size:10px;font-weight:600}.pd-companies{margin-top:var(--space-sm);flex-wrap:wrap;gap:4px;display:flex}.pd-company-chip{border-radius:var(--radius-full);background:var(--bg-tertiary);color:var(--text-secondary);padding:2px 8px;font-size:10px;font-weight:500}.pd-status-bar{margin-bottom:var(--space-lg);scrollbar-width:none;-webkit-overflow-scrolling:touch;gap:4px;display:flex;overflow-x:auto}.pd-status-bar::-webkit-scrollbar{display:none}.pd-status-btn{border-radius:var(--radius-full);font-size:var(--font-xs);white-space:nowrap;border:1.5px solid var(--border-color);background:var(--bg-card);color:var(--text-secondary);cursor:pointer;align-items:center;gap:4px;padding:6px 12px;font-weight:600;transition:all .15s;display:flex}.pd-status-btn:active{transform:scale(.95)}.pd-status-btn.active{background:var(--status-color)}@supports (color:color-mix(in lab, red, red)){.pd-status-btn.active{background:color-mix(in srgb,var(--status-color)12%,transparent)}}.pd-status-btn.active{color:var(--status-color);border-color:var(--status-color)}@supports (color:color-mix(in lab, red, red)){.pd-status-btn.active{border-color:color-mix(in srgb,var(--status-color)30%,transparent)}}.pd-revision-banner{align-items:center;gap:var(--space-sm);padding:var(--space-md)var(--space-lg);background:var(--warning);display:flex}@supports (color:color-mix(in lab, red, red)){.pd-revision-banner{background:color-mix(in srgb,var(--warning)8%,transparent)}}.pd-revision-banner{border:1px solid var(--warning)}@supports (color:color-mix(in lab, red, red)){.pd-revision-banner{border:1px solid color-mix(in srgb,var(--warning)20%,transparent)}}.pd-revision-banner{border-radius:var(--radius-md);margin-bottom:var(--space-lg);font-size:var(--font-sm);color:var(--warning);font-weight:500}.pd-revision-btn{border-radius:var(--radius-full);background:var(--warning);color:#fff;font-size:var(--font-xs);cursor:pointer;border:none;margin-left:auto;padding:4px 12px;font-weight:700}.pd-timer-card{padding:var(--space-md)var(--space-lg);background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);margin-bottom:var(--space-lg);justify-content:space-between;align-items:center;animation:.2s accordionOpen;display:flex}.pd-timer-display{flex-direction:column;display:flex}.pd-timer-value{font-size:var(--font-2xl);letter-spacing:1px;font-family:SF Mono,JetBrains Mono,monospace;font-weight:800}.pd-timer-total{font-size:var(--font-xs);color:var(--text-tertiary)}.pd-timer-controls{gap:6px;display:flex}.pd-timer-btn{cursor:pointer;border:none;border-radius:50%;justify-content:center;align-items:center;width:36px;height:36px;transition:transform .15s;display:flex}.pd-timer-btn:active{transform:scale(.85)}.pd-timer-btn.primary{background:var(--accent);color:#fff}.pd-timer-btn.danger{background:var(--danger);color:#fff}.pd-timer-btn.success{background:var(--success);color:#fff}.pd-timer-btn.ghost{background:var(--bg-tertiary);color:var(--text-secondary)}.pd-tabs{background:var(--bg-tertiary);border-radius:var(--radius-md);margin-bottom:var(--space-lg);gap:2px;padding:3px;display:flex}.pd-tab{border-radius:var(--radius-sm);cursor:pointer;font-size:var(--font-xs);color:var(--text-tertiary);background:0 0;border:none;flex:1;justify-content:center;align-items:center;gap:4px;padding:8px 6px;font-weight:600;transition:all .15s;display:flex}.pd-tab:active{transform:scale(.96)}.pd-tab.active{background:var(--bg-card);color:var(--text-primary);box-shadow:var(--shadow-sm)}.pd-tab-icon{font-size:14px}.pd-content{min-height:200px}.pd-tab-content{gap:var(--space-md);flex-direction:column;animation:.2s pdContentIn;display:flex}@keyframes pdContentIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.pd-section{gap:var(--space-sm);flex-direction:column;display:flex}.pd-section-header{font-size:var(--font-xs);text-transform:uppercase;letter-spacing:.5px;color:var(--text-tertiary);align-items:center;gap:6px;font-weight:700;display:flex}.pd-section-body{padding:var(--space-md)var(--space-lg);background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md)}.pd-description{font-size:var(--font-sm);color:var(--text-primary);line-height:1.7}.pd-hints .pd-section-body{background:var(--warning)}@supports (color:color-mix(in lab, red, red)){.pd-hints .pd-section-body{background:color-mix(in srgb,var(--warning)4%,var(--bg-card))}}.pd-hints .pd-section-body{border-color:var(--warning)}@supports (color:color-mix(in lab, red, red)){.pd-hints .pd-section-body{border-color:color-mix(in srgb,var(--warning)15%,var(--border-color))}}.pd-hint-item{gap:var(--space-sm);padding:var(--space-xs)0;font-size:var(--font-sm);color:var(--text-secondary);display:flex}.pd-hint-num{color:var(--warning);flex-shrink:0;width:18px;font-weight:700}.pd-approaches-label{font-size:var(--font-xs);text-transform:uppercase;letter-spacing:.5px;color:var(--text-tertiary);margin-top:var(--space-sm);align-items:center;gap:6px;font-weight:700;display:flex}.pd-approach-card{padding:var(--space-lg);background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);border-left:3px solid var(--text-tertiary)}.pd-approach-card.optimal{border-left-color:var(--success);background:var(--success)}@supports (color:color-mix(in lab, red, red)){.pd-approach-card.optimal{background:color-mix(in srgb,var(--success)3%,var(--bg-card))}}.pd-approach-header{align-items:center;gap:var(--space-sm);margin-bottom:var(--space-sm);display:flex}.pd-approach-name{font-size:var(--font-sm);font-weight:800}.pd-approach-card.optimal .pd-approach-name{color:var(--success)}.pd-optimal-badge{border-radius:var(--radius-full);background:var(--success);padding:1px 6px;font-size:10px;font-weight:700}@supports (color:color-mix(in lab, red, red)){.pd-optimal-badge{background:color-mix(in srgb,var(--success)12%,transparent)}}.pd-optimal-badge{color:var(--success)}.pd-approach-desc{font-size:var(--font-sm);color:var(--text-secondary);margin-bottom:var(--space-md);line-height:1.6}.pd-complexity-row{gap:var(--space-sm);display:flex}.pd-complexity{font-size:var(--font-xs);border-radius:var(--radius-full);align-items:center;gap:4px;padding:3px 10px;font-weight:600;display:flex}.pd-complexity.time{background:var(--accent-bg);color:var(--accent)}.pd-complexity.space{background:var(--bg-tertiary);color:var(--text-secondary)}.pd-textarea{width:100%;padding:var(--space-md);background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);font-size:var(--font-sm);color:var(--text-primary);resize:vertical;line-height:1.6;font-family:var(--font-family);transition:border-color .15s}.pd-textarea:focus{border-color:var(--accent);outline:none}.pd-code-input{font-family:SF Mono,JetBrains Mono,Fira Code,monospace;font-size:13px}.pd-complexity-inputs{gap:var(--space-md);grid-template-columns:1fr 1fr;display:grid}.pd-input-label{font-size:var(--font-xs);color:var(--text-secondary);margin-bottom:4px;font-weight:600;display:block}.pd-input{width:100%;padding:8px var(--space-md);background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-sm);font-size:var(--font-sm);color:var(--text-primary);transition:border-color .15s}.pd-input:focus{border-color:var(--accent);outline:none}.pd-pattern-card{padding:var(--space-md)var(--space-lg);background:var(--accent-bg);border:1px solid var(--accent)}@supports (color:color-mix(in lab, red, red)){.pd-pattern-card{border:1px solid color-mix(in srgb,var(--accent)15%,transparent)}}.pd-pattern-card{border-radius:var(--radius-md)}.pd-pattern-label{font-size:var(--font-sm);color:var(--accent);margin-bottom:4px;font-weight:700}.pd-pattern-desc{font-size:var(--font-sm);color:var(--text-secondary);line-height:1.5}.pd-ai-grid{gap:var(--space-md);flex-direction:column;display:flex}.pd-danger-zone{margin-top:var(--space-2xl);border-top:1px solid var(--border-color);padding-top:var(--space-lg)}.pd-delete-toggle{align-items:center;gap:var(--space-sm);width:100%;padding:var(--space-sm)0;color:var(--text-tertiary);font-size:var(--font-xs);cursor:pointer;background:0 0;border:none;font-weight:600;display:flex}.pd-delete-toggle:hover{color:var(--danger)}.pd-delete-confirm{padding:var(--space-md);margin-top:var(--space-sm);border-radius:var(--radius-md);background:var(--danger)}@supports (color:color-mix(in lab, red, red)){.pd-delete-confirm{background:color-mix(in srgb,var(--danger)5%,transparent)}}.pd-delete-confirm{border:1px solid var(--danger)}@supports (color:color-mix(in lab, red, red)){.pd-delete-confirm{border:1px solid color-mix(in srgb,var(--danger)15%,transparent)}}.pd-delete-confirm{animation:.2s accordionOpen}.pd-delete-confirm p{font-size:var(--font-xs);color:var(--text-secondary);margin-bottom:var(--space-md)}.pd-delete-btn{background:var(--danger);color:#fff;border-radius:var(--radius-sm);font-size:var(--font-sm);cursor:pointer;border:none;align-items:center;gap:6px;padding:8px 16px;font-weight:600;transition:transform .15s;display:flex}.pd-delete-btn:active{transform:scale(.95)}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}