.tracer-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.75rem;margin-bottom:1.5rem;box-shadow:var(--shadow)}.tracer-section-title{font-size:1.15rem;font-weight:700;color:var(--primary);margin-bottom:1.25rem;border-bottom:2px solid var(--border-faint);padding-bottom:.5rem;text-transform:uppercase;letter-spacing:.03em}.subsection-title{font-size:.95rem;font-weight:600;color:var(--text);margin-bottom:.75rem}.algo-filter-bar{display:flex;flex-direction:column;gap:1rem;margin-bottom:1.5rem;padding:1.25rem;background:linear-gradient(180deg,color-mix(in srgb,var(--surface2) 96%,#1f2937 4%) 0%,var(--surface2) 100%);border:1px solid var(--border);border-radius:12px}.algo-search-input{width:100%;padding:.75rem 1rem;font-size:.95rem;background:var(--surface);border:1px solid var(--border);border-radius:8px;color:var(--text);font-family:var(--mono);transition:all .2s}.algo-search-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-dim)}.algo-search-input::placeholder{color:var(--text-faint)}.algo-cats-scroll{overflow-x:auto;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.algo-cats{display:flex;gap:.5rem;padding:.25rem;flex-wrap:wrap}.cat-btn{padding:.55rem 1rem;font-size:.85rem;font-weight:600;border:1px solid var(--border);background:var(--surface);color:var(--text-muted);border-radius:8px;cursor:pointer;transition:all .2s;white-space:nowrap;flex-shrink:0}.cat-btn:hover{border-color:var(--primary);background:var(--primary-dim);color:var(--primary)}.cat-btn.active{border-color:var(--primary);background:var(--primary);color:#fff;box-shadow:0 0 12px #6366f166}.algo-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:.75rem}.algo-btn-v2{background:linear-gradient(180deg,color-mix(in srgb,var(--surface) 92%,#1f2937 8%) 0%,var(--surface) 100%);border:1px solid var(--border);border-radius:10px;padding:1rem;cursor:pointer;text-align:left;display:flex;flex-direction:column;gap:.35rem;transition:all .2s cubic-bezier(.4,0,.2,1);box-shadow:0 1px 2px #0000000d;min-height:160px}.algo-btn-v2:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:0 4px 12px #6366f126}.algo-btn-v2.selected{border-color:var(--primary);background:var(--primary-light);box-shadow:0 0 0 2px var(--primary-dim)}.algo-btn-v2.hidden{display:none}.algo-btn-card-header{display:flex;flex-direction:column;align-items:flex-start;gap:.3rem}.algo-btn-card-header strong{font-size:.95rem;font-weight:700;color:var(--text);line-height:1.3}.algo-cat-pill{font-size:.6rem;background:var(--primary-dim);color:var(--primary);border-radius:5px;padding:2px 6px;font-weight:700;text-transform:uppercase;white-space:nowrap}.algo-btn-desc{display:block;font-size:.75rem;color:var(--text-muted);line-height:1.35;flex:1;margin-top:.05rem}.algo-btn-vars-label{display:block;font-size:.7rem;color:var(--text-faint);margin-top:.35rem;border-top:1px dashed var(--border);padding-top:.4rem;line-height:1.3}.algo-btn-vars-label code{color:var(--primary);font-weight:600;font-size:.65rem}.templates-section{background:linear-gradient(180deg,color-mix(in srgb,var(--surface2) 94%,#1e293b 6%) 0%,var(--surface2) 100%);padding:1.25rem;border-radius:var(--radius);margin-bottom:1.5rem;border:1px solid var(--border)}.quick-templates{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:.8rem}.template-pill{width:100%;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:.75rem 1rem;cursor:pointer;text-align:left;transition:all .2s;display:flex;flex-direction:column;gap:.25rem}.template-pill:hover{border-color:var(--primary);background:var(--primary-light)}.template-pill.active-tpl{border-color:var(--primary);background:var(--primary-light);box-shadow:0 0 0 2px var(--primary-dim)}.template-pill strong{font-size:.85rem;color:var(--text);line-height:1.35}.tpl-desc{font-size:.72rem;color:var(--text-muted);line-height:1.45}.input-form{padding:.5rem 0;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius);padding:1rem 1rem 1.1rem}.input-form-inner{display:flex;flex-wrap:wrap;gap:1.5rem;margin-bottom:1rem}.input-field-label{display:flex;flex-direction:column;gap:.5rem;font-weight:700;font-size:.88rem;color:var(--text);flex:1 1 250px}.tracer-input{padding:.75rem 1rem;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text);font-family:var(--mono);font-size:.95rem;width:100%}.tracer-input:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 3px var(--primary-dim)}.pulse-highlight{animation:pulse-border .8s ease-in-out infinite}@keyframes pulse-border{0%,to{border-color:var(--border);box-shadow:none}50%{border-color:var(--primary);box-shadow:0 0 10px var(--primary-dim)}}.tracer-btn{padding:.75rem 1.5rem;border-radius:10px;font-weight:700;font-size:.95rem;cursor:pointer;border:none;display:inline-flex;align-items:center;gap:.5rem;transition:all .2s}.tracer-btn--primary{background:var(--primary);color:#fff}.tracer-btn--primary:hover{background:var(--primary-hover);transform:translateY(-1px)}.tracer-btn--secondary{background:var(--surface2);color:var(--text);border:1px solid var(--border)}.tracer-btn--secondary:hover{background:var(--border-faint)}.start-simulation-btn{margin-top:.25rem}@media(min-width:900px){#input-card{display:grid!important;grid-template-columns:1.1fr 1fr;gap:1rem;align-items:start}#input-card .tracer-section-title{grid-column:1 / -1;margin-bottom:.9rem}#input-card .templates-section,#input-card .input-form{margin-bottom:0;height:100%}}.tracer-workspace{margin-bottom:2rem}.debug-control-bar{background:#1e1e2e;border:1px solid #2d2b40;border-top-left-radius:14px;border-top-right-radius:14px;padding:1rem 1.5rem;color:#fff;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}.pulse-indicator{font-size:.75rem;color:#f15c5c;background:#f15c5c26;padding:3px 8px;border-radius:6px;font-family:var(--mono);font-weight:800;animation:debug-pulse 1.8s infinite;margin-right:.75rem}@keyframes debug-pulse{0%{opacity:.6}50%{opacity:1}to{opacity:.6}}.control-center{display:flex;align-items:center;gap:.5rem}.control-btn{background:#2d2b40;border:none;color:#fff;padding:.5rem 1rem;font-weight:700;font-size:.85rem;border-radius:8px;cursor:pointer;display:inline-flex;align-items:center;gap:.35rem;transition:all .15s}.control-btn:hover:not(:disabled){background:#3c3954}.control-btn:disabled{opacity:.3;cursor:not-allowed}.control-btn--primary{background:var(--primary)}.control-btn--primary:hover:not(:disabled){background:var(--primary-hover)}.control-btn--ghost{background:transparent;color:#a5b4fc}.control-btn--ghost:hover{background:#ffffff0d}.step-badge{background:#0f0e15;color:var(--primary);border:1px solid #2d2b40;border-radius:8px;padding:.5rem .75rem;font-family:var(--mono);font-size:.8rem;font-weight:700;min-width:110px;text-align:center}.tracer-layout{display:grid;grid-template-columns:3fr 2fr;gap:0;border:1px solid var(--border);border-top:none;background:var(--surface2)}@media(max-width:850px){.tracer-layout{grid-template-columns:1fr}}.tracer-code-panel{background:#0d1117;display:flex;flex-direction:column;border-right:1px solid var(--border);height:400px}.ide-tab-header{background:#161b22;height:38px;border-bottom:1px solid #21262d;display:flex;justify-content:space-between;align-items:center;padding:0 1rem}.ide-tab{background:#0d1117;color:#c9d1d9;height:38px;display:flex;align-items:center;gap:.4rem;padding:0 1rem;font-size:.8rem;font-family:var(--mono);border-top-left-radius:6px;border-top-right-radius:6px;border-top:2px solid var(--primary);margin-top:4px}.ide-dot{width:8px;height:8px;border-radius:50%;display:inline-block;margin-left:4px}.ide-dot.green{background:#22c55e}.ide-dot.yellow{background:#eab308}.ide-dot.red{background:#ef4444}.code-editor-scroller{flex:1;overflow-y:auto;padding:.5rem 0}.tracer-code{color:#c9d1d9;font-size:.85rem;line-height:1.8;margin:0;font-family:var(--mono)}.code-line-tr{display:flex;align-items:center;padding-left:.25rem;border-left:3px solid transparent;transition:background .1s}.code-active-arrow{min-width:18px;width:18px;color:#facc15;font-size:.85rem;line-height:1;opacity:0;user-select:none;flex-shrink:0;filter:drop-shadow(0 0 4px rgba(250,204,21,.7));transition:opacity .1s}.line-number-gutter{width:28px;color:#484f58;user-select:none;text-align:right;margin-right:.75rem;font-size:.78rem;flex-shrink:0}.code-text-span{white-space:pre}.code-line-tr.active-line{background:#6366f12e;border-left-color:#818cf8}.code-line-tr.active-line .code-text-span{color:#fff;font-weight:500}.code-line-tr.active-line .code-active-arrow{opacity:1}.tracer-side-panels{display:flex;flex-direction:column;height:400px}.tracer-vars-panel,.tracer-exp-panel{display:flex;flex-direction:column;background:var(--surface);flex:1;overflow:hidden}.tracer-vars-panel{border-bottom:1px solid var(--border)}.panel-header{background:var(--surface2);padding:.6rem 1.25rem;font-weight:700;font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}.flex-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:.5rem}.panel-body{padding:1rem;flex:1;overflow-y:auto}.tracer-vars{display:grid;grid-template-columns:1fr;gap:.6rem}.v2-var-card{background:var(--surface2);border:1px solid var(--border);padding:.55rem .75rem;border-radius:8px;display:grid;grid-template-columns:minmax(42px,auto) auto 1fr;align-items:center;gap:.5rem}.v2-var-name{font-family:var(--mono);color:var(--primary);font-weight:700;font-size:.78rem}.v2-var-eq{font-family:var(--mono);color:var(--text-muted);font-weight:700;font-size:.85rem}.v2-var-value{font-family:var(--mono);color:var(--text);font-size:1rem;font-weight:700;text-align:left;letter-spacing:.01em}.v2-var-value.uninitialized{color:var(--text-faint);font-style:italic;font-weight:400;font-size:.95rem}.tracer-explanation{font-size:.9rem;color:var(--text);line-height:1.5}.array-visualizer-card{background:var(--surface);border:1px solid var(--border);border-top:none}.array-viz{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}.v2-arr-cell{display:flex;flex-direction:column;align-items:center;background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:.55rem .8rem;min-width:54px;transition:all .2s}.v2-arr-cell--active{border-color:var(--primary);background:var(--primary-light);transform:scale(1.03);box-shadow:0 4px 10px var(--primary-dim)}.v2-arr-val{font-family:var(--mono);font-weight:800;font-size:1rem;color:var(--text)}.v2-arr-idx{font-size:.65rem;color:var(--text-muted);margin-top:3px;font-family:var(--mono)}.trace-table-card{background:var(--surface);border:1px solid var(--border);border-top:none;border-bottom-left-radius:14px;border-bottom-right-radius:14px;overflow:hidden}.trace-table-scroller{max-height:250px;overflow-y:auto}.trace-table{width:100%;border-collapse:collapse;font-size:.85rem}.trace-table th{background:var(--surface2);padding:.75rem 1rem;text-align:left;font-weight:700;color:var(--text-muted);border-bottom:2px solid var(--border);position:sticky;top:0}.trace-table td{padding:.65rem 1rem;border-bottom:1px solid var(--border-faint);color:var(--text)}.trace-table-row{cursor:pointer;transition:background .15s}.trace-table-row:hover{background:var(--border-faint)}.trace-table-row.active-row{background:var(--primary-light);border-left:4px solid var(--primary)}.trace-table-row.active-row td{font-weight:600;color:var(--primary)}.trace-table-row td:first-child{position:relative;padding-left:1.7rem}.trace-table-row.active-row td:first-child:before{content:"▶";position:absolute;left:.6rem;top:50%;transform:translateY(-50%);color:var(--primary);font-size:.72rem;font-weight:900}.mono-font{font-family:var(--mono)}.tracer-done{text-align:center;padding:2.5rem 1.5rem}.done-icon{font-size:3rem;margin-bottom:.75rem;animation:done-bounce 1s ease-in-out infinite alternate}@keyframes done-bounce{0%{transform:translateY(0)}to{transform:translateY(-8px)}}.tracer-done h3{font-size:1.4rem;margin-bottom:.5rem;font-weight:800}.tracer-done p{color:var(--text-muted);margin-bottom:1.5rem;font-family:var(--mono);font-size:.9rem}.done-actions{display:flex;justify-content:center;gap:1rem;flex-wrap:wrap}