:root,[data-theme=dark]{--bg: #0b0e14;--bg-panel: #161b22;--bg-elevated: #1d2026;--border: #30363d;--text: #e1e2eb;--text-dim: #978da0;--accent: #ae71ff;--accent-text: #d8b9ff;--accent-soft: rgba(174, 113, 255, .16);--green: #34d399;--yellow: #fbbf24;--red: #fb7185;--highlight: #f0883e;--glass: rgba(22, 27, 34, .7);--glass-border: rgba(48, 54, 61, .6);--violet-gradient: linear-gradient(135deg, #ae71ff 0%, #7d2dd9 100%);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace}[data-theme=light]{--bg: #f7f8fa;--bg-panel: #ffffff;--bg-elevated: #f0f2f5;--border: #d8dee4;--text: #1c1e26;--text-dim: #6b7280;--accent: #7d2dd9;--accent-text: #6b21c8;--accent-soft: rgba(125, 45, 217, .1);--green: #059669;--yellow: #b45309;--red: #e11d48;--highlight: #d97706;--glass: rgba(255, 255, 255, .75);--glass-border: rgba(216, 222, 228, .9)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-sans);-webkit-font-smoothing:antialiased}.app{max-width:1340px;margin:0 auto;padding:0 24px 64px}.topbar{display:flex;align-items:center;gap:16px;padding:20px 0;border-bottom:1px solid var(--border);margin-bottom:24px}.logo{height:34px;display:block}.tagline{color:var(--text-dim);font-size:14px}.problem-header{display:flex;align-items:center;gap:14px}.problem-header h1{font-size:26px;margin:0}.difficulty{font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px}.difficulty-easy{color:var(--green);background:#3fb95026}.difficulty-medium{color:var(--yellow);background:#d2992226}.difficulty-hard{color:var(--red);background:#f8514926}.leetcode-link{margin-left:auto;color:var(--text-dim);font-size:13px;text-decoration:none}.leetcode-link:hover{color:var(--text)}.problem-input{color:var(--text-dim);font-size:14px;font-family:var(--font-mono);margin:10px 0 20px}.workspace{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:20px;align-items:start}@media (max-width: 900px){.workspace{grid-template-columns:1fr}}.code-panel{background:var(--bg-panel);border:1px solid var(--border);border-radius:10px;overflow:auto;max-height:560px}.code-panel pre{margin:0;padding:16px 0;background:transparent!important;font-size:14px;line-height:1.65}.code-panel code{counter-reset:line;display:block}.code-panel .line{display:inline-block;width:100%;padding:0 16px 0 0;transition:background-color .2s ease}.code-panel .line:before{counter-increment:line;content:counter(line);display:inline-block;width:44px;padding-right:16px;text-align:right;color:var(--text-dim);opacity:.6}.code-panel .line-active{background:var(--accent-soft);box-shadow:inset 3px 0 0 var(--accent)}@keyframes line-step-pulse{0%{background-color:#ae71ff6b}to{background-color:transparent}}.code-panel .line-pulse{animation:line-step-pulse .45s ease-out}.code-loading{padding:24px;color:var(--text-dim)}.right-pane{display:flex;flex-direction:column;gap:14px}.step-label{position:relative;background:var(--bg-panel);border:1px solid var(--border);border-radius:10px;padding:14px 16px 28px;font-size:15px;line-height:1.5;min-height:72px}.step-label-text{display:block}.step-badge{position:absolute;bottom:8px;right:10px;font-family:var(--font-mono);font-size:10px;font-weight:700;color:var(--accent);background:var(--accent-soft);border:1px solid rgba(174,113,255,.25);border-radius:999px;padding:2px 7px;letter-spacing:.04em}.step-badge-total{color:var(--text-dim);font-weight:400;margin-left:1px}.variables-panel{display:flex;flex-wrap:wrap;gap:8px}.variable-chip{display:flex;align-items:center;font-family:var(--font-mono);font-size:13px;border:1px solid var(--border);border-radius:6px;overflow:hidden}.variable-name{background:var(--bg-elevated);color:var(--text-dim);padding:4px 8px}.variable-value{padding:4px 8px;color:var(--accent);background:var(--bg-panel)}.visual-panel{display:flex;flex-direction:column;gap:14px}.visual-block{background:var(--bg-panel);border:1px solid var(--border);border-radius:10px;padding:16px}.visual-title{font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--text-dim);margin-bottom:12px}.array-row{display:flex;gap:6px}.array-col{display:flex;flex-direction:column;align-items:center}.array-cell{width:52px;height:52px;display:flex;align-items:center;justify-content:center;background:var(--bg-elevated);border:1px solid var(--border);border-radius:8px;font-family:var(--font-mono);font-size:18px;font-weight:600}.cell-highlighted{border-color:var(--highlight);color:var(--highlight);background:#f0883e1f}.array-index{margin-top:6px;font-size:12px;color:var(--text-dim);font-family:var(--font-mono)}.pointer-slot{height:22px;margin-top:2px}.pointer{font-size:12px;font-weight:700;color:var(--accent);font-family:var(--font-mono);white-space:nowrap}.dict-row{display:flex;flex-wrap:wrap;gap:8px;min-height:38px;align-items:center}.dict-empty{color:var(--text-dim);font-style:italic;font-size:14px;border:1px dashed var(--border);border-radius:8px;padding:8px 24px}.dict-entry{display:flex;align-items:center;gap:8px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:8px;padding:7px 12px;font-family:var(--font-mono);font-size:14px;transition:border-color .2s ease}.dict-entry-active{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}.dict-key{color:var(--highlight);font-weight:600}.dict-arrow{color:var(--text-dim)}.dict-value{color:var(--accent);font-weight:600}.step-controls{display:flex;align-items:center;gap:14px;margin-top:20px;background:var(--bg-panel);border:1px solid var(--border);border-radius:999px;padding:10px 20px}.transport{display:flex;align-items:center;gap:4px}.transport-btn{display:flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:50%;background:var(--bg-elevated);border:1px solid var(--border);color:var(--text-dim);cursor:pointer;transition:color .15s,border-color .15s,background .15s;flex-shrink:0}.transport-btn:hover:not(:disabled){color:var(--text);border-color:var(--accent);background:#ae71ff14}.transport-btn:disabled{opacity:.3;cursor:default}.play-btn{display:flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:50%;background:var(--accent);border:none;color:#fff;cursor:pointer;margin:0 4px;transition:opacity .15s,transform .1s;flex-shrink:0}.play-btn:hover{opacity:.88;transform:scale(1.05)}.step-counter{font-family:var(--font-mono);font-size:13px;color:var(--text-dim);min-width:48px;text-align:center;white-space:nowrap}.scrubber{flex:1;height:4px;-moz-appearance:none;appearance:none;-webkit-appearance:none;background:var(--border);border-radius:99px;outline:none;cursor:pointer;accent-color:var(--accent)}.scrubber::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer;box-shadow:0 0 0 2px #ae71ff40}.scrubber::-moz-range-thumb{width:14px;height:14px;border:none;border-radius:50%;background:var(--accent);cursor:pointer}.speeds{display:flex;gap:4px}.speed-btn{background:transparent;border:1px solid var(--border);color:var(--text-dim);font-family:var(--font-mono);font-size:12px;border-radius:999px;padding:4px 10px;cursor:pointer;transition:border-color .15s,color .15s,background .15s}.speed-btn:hover{border-color:var(--accent);color:var(--text)}.speed-btn.speed-active{background:var(--accent);border-color:var(--accent);color:#fff}.approach{margin-top:36px;background:var(--bg-panel);border:1px solid var(--border);border-radius:10px;padding:24px}.approach h2{margin-top:0;font-size:20px}.approach h3{font-size:16px}.approach p,.approach li{line-height:1.65;color:var(--text)}.approach li{margin-bottom:8px}.complexity{display:flex;gap:32px;font-family:var(--font-mono);font-size:14px;margin:16px 0;color:var(--text-dim)}.complexity strong{color:var(--text)}.stack-column{display:flex;flex-direction:column;gap:6px;min-height:46px;width:120px;justify-content:flex-end}.stack-empty{color:var(--text-dim);font-style:italic;font-size:14px;border:1px dashed var(--border);border-radius:8px;padding:8px 0;text-align:center}.stack-item{position:relative;background:var(--bg-elevated);border:1px solid var(--border);border-radius:8px;padding:8px 0;text-align:center;font-family:var(--font-mono);font-size:16px;font-weight:600}.stack-item-active{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}.stack-top-tag{position:absolute;right:-38px;top:50%;transform:translateY(-50%);font-size:11px;color:var(--text-dim);font-weight:400}.set-item{background:var(--bg-elevated);border:1px solid var(--border);border-radius:8px;padding:7px 14px;font-family:var(--font-mono);font-size:14px;font-weight:600;color:var(--highlight)}.list-row{display:flex;align-items:flex-start}.list-col{display:flex;flex-direction:column;align-items:center}.list-node{position:relative;width:52px;height:52px;display:flex;align-items:center;justify-content:center;background:var(--bg-elevated);border:1px solid var(--border);border-radius:10px;font-family:var(--font-mono);font-size:18px;font-weight:600}.list-null-badge{position:absolute;top:-8px;right:-8px;font-size:12px;background:var(--bg);border:1px solid var(--border);border-radius:999px;width:20px;height:20px;display:flex;align-items:center;justify-content:center;color:var(--red)}.list-gap{display:flex;flex-direction:column;justify-content:center;height:52px;width:34px;align-items:center}.list-arrow{font-size:16px;line-height:1.1;color:var(--border);opacity:.35;transition:all .25s ease}.list-arrow-on{color:var(--accent);opacity:1;font-weight:700}.tree-root{display:flex;justify-content:center}.tree-branch{display:flex;flex-direction:column;align-items:center}.tree-children{display:flex;gap:12px;margin-top:14px;position:relative}.tree-children:before{content:"";position:absolute;top:-10px;left:25%;right:25%;border-top:1px solid var(--border)}.tree-spacer{width:44px}.tree-node{position:relative;width:44px;height:44px;display:flex;align-items:center;justify-content:center;background:var(--bg-elevated);border:1px solid var(--border);border-radius:50%;font-family:var(--font-mono);font-size:16px;font-weight:600;transition:border-color .2s ease,opacity .2s ease}.tree-node-active{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent);color:var(--accent)}.tree-node-visited{opacity:.35}.tree-badge{position:absolute;top:-10px;right:-14px;font-size:10px;background:var(--accent);color:#fff;border-radius:999px;padding:1px 6px;font-weight:700}.cell-dimmed{border-color:var(--border)}.home-intro{margin:8px 0 28px;color:var(--text-dim);font-size:15px;line-height:1.6;max-width:640px}.category-group{margin-bottom:28px}.category-title{font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--text-dim);margin-bottom:10px}.problem-list{display:flex;flex-direction:column;gap:8px}.problem-card{display:flex;align-items:center;gap:14px;background:var(--bg-panel);border:1px solid var(--border);border-radius:10px;padding:14px 18px;text-decoration:none;color:var(--text);transition:border-color .15s ease}.problem-number{font-family:var(--font-mono);font-size:13px;color:var(--text-dim);min-width:36px}.topbar-link{display:block}.back-link{color:var(--text-dim);text-decoration:none;font-size:13px;display:inline-flex;align-items:center;gap:5px;margin-bottom:12px}.back-link:hover{color:var(--text)}.home-hero{background:linear-gradient(135deg,#7c5cff14,#7c5cff05);border:1px solid rgba(124,92,255,.2);border-radius:14px;padding:32px;margin-bottom:32px}.home-hero h2{margin-top:0;margin-bottom:16px;font-size:24px}.home-hero p{line-height:1.7;color:var(--text);margin-bottom:14px}.home-hero code{font-family:var(--font-mono);font-size:13px;background:var(--bg-elevated);color:var(--accent);padding:2px 6px;border-radius:4px}.home-buttons{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}.home-button{display:inline-flex;align-items:center;gap:7px;padding:10px 16px;border-radius:8px;font-size:14px;font-weight:600;text-decoration:none;transition:all .2s ease;border:1px solid transparent}.home-button-primary{background:var(--accent);color:#fff}.home-button-primary:hover{background:#6b4ce0;transform:translateY(-1px)}.home-button-secondary{background:var(--bg-panel);color:var(--text);border-color:var(--border)}.home-button-secondary:hover{border-color:var(--accent);color:var(--accent)}.theme-toggle{margin-left:auto;background:none;border:1px solid var(--border);border-radius:6px;padding:6px 10px;cursor:pointer;color:var(--text-dim);display:flex;align-items:center;transition:color .2s ease}.theme-toggle:hover{border-color:var(--accent);background:var(--accent-soft)}.solution-tabs{display:flex;gap:8px;margin:16px 0 4px;flex-wrap:wrap}.solution-tab{display:flex;flex-direction:column;align-items:flex-start;gap:2px;background:var(--bg-panel);border:1px solid var(--border);border-radius:10px;padding:8px 16px;cursor:pointer;transition:border-color .15s ease,background-color .15s ease}.solution-tab:hover{border-color:var(--accent)}.solution-tab-active{border-color:var(--accent);background:var(--accent-soft)}.solution-tab-index{font-size:11px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--text-dim)}.solution-tab-active .solution-tab-index{color:var(--accent)}.solution-tab-name{font-size:14px;font-weight:600;color:var(--text)}.home-controls{display:flex;align-items:center;gap:16px;margin:8px 0 24px;flex-wrap:wrap}.view-toggle{display:inline-flex;background:var(--bg-panel);border:1px solid var(--border);border-radius:8px;padding:3px}.view-toggle-btn{display:inline-flex;align-items:center;gap:6px;background:none;border:none;color:var(--text-dim);font-size:14px;font-weight:600;padding:6px 14px;border-radius:6px;cursor:pointer}.view-toggle-active{background:var(--accent);color:#fff}.search-box{position:relative;flex:1;min-width:200px;max-width:420px}.search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text-dim)}.search-input{width:100%;background:var(--bg-panel);border:1px solid var(--border);border-radius:8px;padding:9px 12px 9px 36px;font-size:14px;color:var(--text)}.search-input:focus{outline:none;border-color:var(--accent)}.search-empty{color:var(--text-dim);font-style:italic}.roadmap-scroll{overflow-x:auto;padding:8px 0 24px}.roadmap-canvas{position:relative;margin:0 auto}.roadmap-svg{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;pointer-events:none}.roadmap-edge{stroke:var(--border);stroke-width:2.5;fill:none}.roadmap-node{position:absolute;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;border-radius:10px;border:1px solid var(--border);padding:8px 10px;cursor:pointer;font-family:inherit;transition:transform .12s ease,box-shadow .12s ease}.roadmap-node-active{background:var(--accent);border-color:var(--accent)}.roadmap-node-active .roadmap-node-label{color:#fff}.roadmap-node-active:hover{transform:translateY(-2px);box-shadow:0 6px 18px #7c5cff59}.roadmap-node-locked{background:var(--bg-elevated);cursor:default;opacity:.55}.roadmap-node-locked .roadmap-node-label{color:var(--text-dim)}.roadmap-node-label{font-size:13px;font-weight:700;text-align:center;line-height:1.15}.roadmap-progress{display:block;width:90%;height:5px;border-radius:999px;background:#00000040;overflow:hidden}.roadmap-progress-fill{display:block;height:100%;background:var(--green);border-radius:999px}.roadmap-node-count{position:absolute;top:-8px;right:-8px;background:var(--green);color:#04210b;font-size:11px;font-weight:700;border-radius:999px;padding:1px 7px}.panel-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;display:flex;justify-content:flex-end;z-index:50}.category-panel{width:min(640px,92vw);height:100%;background:var(--bg);border-left:1px solid var(--border);overflow-y:auto;padding:24px;animation:panel-slide .18s ease-out}@keyframes panel-slide{0%{transform:translate(24px);opacity:.4}to{transform:translate(0);opacity:1}}.category-panel-header{position:relative;text-align:center;margin-bottom:24px}.category-panel-header h2{margin:0 0 8px;font-size:24px}.panel-close{position:absolute;left:0;top:0;background:var(--bg-elevated);border:1px solid var(--border);border-radius:6px;color:var(--text);width:32px;height:32px;display:flex;align-items:center;justify-content:center;cursor:pointer}.panel-close:hover{border-color:var(--accent)}.panel-count{color:var(--text-dim);font-size:14px;margin-bottom:10px}.panel-progress{height:8px;border-radius:999px;background:var(--bg-elevated);overflow:hidden}.panel-progress-fill{height:100%;background:var(--green);border-radius:999px}.panel-table{display:flex;flex-direction:column}.panel-row{display:grid;grid-template-columns:44px 1fr 90px 60px;align-items:center;gap:8px;padding:12px 8px;border-bottom:1px solid var(--border)}.panel-row-head{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--text-dim);font-weight:600}.panel-star{color:var(--yellow)}.panel-problem{display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;font-weight:600}.panel-problem:hover{color:var(--accent)}.panel-number{color:var(--text-dim);font-family:var(--font-mono);font-size:12px}.panel-solution{color:var(--text-dim);display:inline-flex;justify-content:center}.panel-solution:hover{color:var(--accent)}.home-links{display:flex;gap:12px;margin-bottom:24px}.home-link{display:inline-flex;align-items:center;gap:6px;color:var(--text-dim);text-decoration:none;font-size:13px;font-weight:600;padding:6px 12px;border-radius:6px;border:1px solid var(--border);transition:border-color .15s ease,color .15s ease}.home-link:hover{border-color:var(--accent);color:var(--accent)}.home-footer{display:flex;gap:12px;margin-top:80px;padding-top:24px;border-top:1px solid var(--border);justify-content:center}.topbar{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:16px 0;border-bottom:1px solid var(--border);margin-bottom:28px}.topbar-left{display:flex;align-items:center;gap:32px}.topnav{display:flex;gap:24px}.topnav-link{color:var(--text-dim);text-decoration:none;font-size:14px;font-weight:500;padding-bottom:4px;border-bottom:2px solid transparent;transition:color .15s ease,border-color .15s ease}.topnav-link:hover{color:var(--accent-text)}.topnav-active{color:var(--accent-text);border-bottom-color:var(--accent)}@media (max-width: 640px){.topnav{display:none}}.topbar-right{display:flex;align-items:center;gap:6px}.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:10px;border:1px solid transparent;background:transparent;color:var(--text-dim);cursor:pointer;text-decoration:none;transition:color .15s ease,background-color .15s ease}.icon-btn:hover{color:var(--accent-text);background:var(--bg-elevated)}.home-layout{display:grid;grid-template-columns:232px 1fr;gap:28px;align-items:start}@media (max-width: 980px){.home-layout{grid-template-columns:1fr}.home-sidebar{display:none}}.home-sidebar{position:sticky;top:24px;display:flex;flex-direction:column;gap:20px;background:var(--bg-panel);border:1px solid var(--border);border-radius:16px;padding:14px}.sidebar-nav{display:flex;flex-direction:column;gap:3px}.sidebar-link{display:flex;align-items:center;justify-content:space-between;gap:8px;background:none;border:none;color:var(--text-dim);font-family:inherit;font-size:13.5px;font-weight:500;text-align:left;padding:9px 12px;border-radius:10px;cursor:pointer;transition:background-color .12s ease,color .12s ease}.sidebar-link:hover{background:var(--bg-elevated);color:var(--text)}.sidebar-active,.sidebar-active:hover{background:var(--accent-soft);color:var(--accent-text)}.sidebar-link-label{display:flex;align-items:center;gap:8px}.sidebar-count{font-family:var(--font-mono);font-size:11px;color:var(--text-dim);background:var(--bg-elevated);border-radius:999px;padding:1px 8px}.sidebar-active .sidebar-count{color:var(--accent-text);background:#ae71ff2e}.sidebar-footer{display:flex;flex-wrap:wrap;gap:8px;border-top:1px solid var(--border);padding-top:16px}.home-main{min-width:0}.dash-header{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center;background:var(--bg-panel);border:1px solid var(--border);border-radius:16px;padding:24px;margin-bottom:24px}.dash-title{font-size:30px;font-weight:800;letter-spacing:-.02em;margin:0}.dash-subtitle{color:var(--text-dim);font-size:15px;margin:4px 0 0}.view-toggle{display:inline-flex;gap:4px;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:4px}.view-toggle-btn{display:inline-flex;align-items:center;gap:6px;background:none;border:none;color:var(--text-dim);font-family:inherit;font-size:13px;font-weight:600;padding:7px 14px;border-radius:8px;cursor:pointer;transition:color .12s ease}.view-toggle-btn:hover{color:var(--text)}.view-toggle-active,.view-toggle-active:hover{background:var(--violet-gradient);color:#fff}.dash-controls{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:32px}.search-box{position:relative;flex:1;min-width:220px;max-width:none}.search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--text-dim)}.search-input{width:100%;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:12px 14px 12px 42px;font-size:15px;font-family:inherit;color:var(--text);transition:border-color .15s ease,box-shadow .15s ease}.search-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}.diff-select{background:var(--bg-elevated);border:1px solid var(--border);border-radius:12px;padding:0 16px;height:46px;color:var(--text);font-family:inherit;font-size:14px;font-weight:600;cursor:pointer}.diff-select:focus{outline:none;border-color:var(--accent)}.cat-sections{display:flex;flex-direction:column;gap:40px}.cat-section-head{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);padding-bottom:10px;margin-bottom:16px}.cat-section-head h2{font-size:13px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--text-dim);margin:0}.cat-section-count{font-family:var(--font-mono);font-size:12px;color:var(--accent-text)}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.glass-card{position:relative;display:flex;flex-direction:column;min-height:178px;background:var(--glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:16px;padding:20px;text-decoration:none;color:var(--text);overflow:hidden;transition:border-color .15s ease,box-shadow .15s ease,transform .1s ease}.glass-card:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background-image:radial-gradient(circle at 2px 2px,var(--accent-soft) 1px,transparent 0);background-size:10px 10px;opacity:.3;pointer-events:none}.glass-card:hover{border-color:var(--accent);box-shadow:0 8px 32px #ae71ff1f}.glass-card:active{transform:scale(.99)}.glass-card-top{position:relative;z-index:1;display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.glass-card-title{position:relative;z-index:1;font-size:18px;font-weight:600;margin:0;flex:1;transition:color .15s ease}.glass-card:hover .glass-card-title{color:var(--accent-text)}.glass-card-bottom{position:relative;z-index:1;margin-top:auto;display:flex;align-items:center;justify-content:space-between}.glass-card-tags{font-family:var(--font-mono);font-size:12px;color:var(--text-dim)}.glass-card-play{color:var(--text-dim);opacity:0;transition:opacity .15s ease,color .15s ease}.glass-card:hover .glass-card-play{opacity:1;color:var(--accent-text)}.status-btn{display:inline-flex;align-items:center;justify-content:center;background:none;border:none;padding:0;cursor:pointer;color:var(--text-dim);transition:color .15s ease,transform .1s ease}.status-btn:hover{color:var(--text);transform:scale(1.1)}.status-done,.status-done:hover{color:var(--green)}.chip{font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;padding:4px 10px;border-radius:6px;border:1px solid transparent}.chip-easy{color:var(--green);background:#34d3991a;border-color:#34d39933}.chip-medium{color:var(--yellow);background:#fbbf241a;border-color:#fbbf2433}.chip-hard{color:var(--red);background:#fb71851a;border-color:#fb718533}.difficulty-easy{color:var(--green);background:#34d3991f}.difficulty-medium{color:var(--yellow);background:#fbbf241f}.difficulty-hard{color:var(--red);background:#fb71851f}.problem-card{display:flex;align-items:center;gap:14px;background:var(--bg-panel);border:1px solid var(--border);border-radius:12px;padding:14px 18px;text-decoration:none;color:var(--text);transition:border-color .15s ease}.problem-card:hover{border-color:var(--accent)}.problem-title{font-weight:600;flex:1}.problem-tags{font-family:var(--font-mono);font-size:12px;color:var(--text-dim);margin-right:8px}@media (max-width: 560px){.problem-tags{display:none}}.search-empty{color:var(--text-dim);font-style:italic;padding:8px 0}