*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:PingFang SC,Microsoft YaHei,sans-serif;background:#0f1117;color:#e0e0e0;height:100vh;display:flex;flex-direction:column;overflow:hidden}#top-nav{display:flex;align-items:center;gap:0;background:#13151f;border-bottom:1px solid #2a2d3a;flex-shrink:0;height:48px;padding:0 1rem}#nav-logo{font-size:1rem;font-weight:600;color:#c0c8e0;padding-right:1.2rem;border-right:1px solid #2a2d3a;margin-right:0;white-space:nowrap}#nav-stage{display:flex;align-items:stretch;height:100%;border-right:1px solid #2a2d3a;padding:0 .5rem}.stage-btn{background:transparent;border:none;color:#7080a0;font-size:.875rem;padding:0 .9rem;cursor:pointer;height:100%;position:relative;transition:color .15s;white-space:nowrap}.stage-btn:hover{color:#c0c8e0}.stage-btn.active{color:#fff;font-weight:600}.stage-btn.active:after{content:"";position:absolute;bottom:0;left:.9rem;right:.9rem;height:2px;background:#4a90d9;border-radius:2px 2px 0 0}#nav-subject{display:flex;align-items:stretch;height:100%;flex:1;padding:0 .5rem;overflow-x:auto;scrollbar-width:none}#nav-subject::-webkit-scrollbar{display:none}.subject-btn{background:transparent;border:none;color:#7080a0;font-size:.875rem;padding:0 .9rem;cursor:pointer;height:100%;position:relative;transition:color .15s;white-space:nowrap;flex-shrink:0}.subject-btn:hover{color:#c0c8e0}.subject-btn.active{color:#fff}.subject-btn.active:after{content:"";position:absolute;bottom:0;left:.9rem;right:.9rem;height:2px;background:#50c878;border-radius:2px 2px 0 0}.subject-btn.unavailable{opacity:.45}#stats-bar{display:flex;align-items:center;gap:1rem;margin-left:auto;font-size:.8rem;flex-shrink:0;padding-left:1rem;border-left:1px solid #2a2d3a}#stats-bar span{color:#7080a0;white-space:nowrap}#btn-reset{padding:.25rem .7rem;background:transparent;border:1px solid #333;border-radius:4px;color:#7080a0;cursor:pointer;font-size:.78rem;transition:border-color .2s,color .2s;white-space:nowrap}#btn-reset:hover{border-color:#dc143c;color:#dc143c}#coming-soon{flex:1;display:flex;align-items:center;justify-content:center}#coming-soon[hidden]{display:none}.coming-soon-inner{text-align:center;color:#4a5070}.coming-soon-icon{font-size:3rem;display:block;margin-bottom:1rem}.coming-soon-inner p{font-size:1rem}#app{display:flex;flex:1;overflow:hidden}#app[hidden]{display:none}#filter-panel{width:200px;flex-shrink:0;background:#1a1d27;border-right:1px solid #2a2d3a;padding:1rem;overflow-y:auto;font-size:.85rem}#filter-panel h3{font-size:.9rem;color:#c0c8e0;margin-bottom:.75rem}#filter-panel p{color:#7080a0;margin:.75rem 0 .4rem;font-size:.78rem;text-transform:uppercase;letter-spacing:.05em}#filter-panel label{display:flex;align-items:center;gap:.4rem;padding:.2rem 0;cursor:pointer;color:#c0c8e0}#legend{margin-top:1rem;font-size:.8rem;color:#a0a8c0;line-height:1.8}.legend-dot{display:inline-block;width:10px;height:10px;border-radius:50%;vertical-align:middle;margin-right:4px}.legend-line{display:inline-block;width:24px;height:2px;vertical-align:middle;margin-right:4px;background:#666}.legend-line.dashed{background:repeating-linear-gradient(90deg,#999 0,#999 5px,transparent 5px,transparent 10px)}.legend-line.dotted{background:repeating-linear-gradient(90deg,#4A90D9 0,#4A90D9 2px,transparent 2px,transparent 5px)}#graph-container{flex:1;position:relative;overflow:hidden}#card-panel{width:320px;flex-shrink:0;background:#1a1d27;border-left:1px solid #2a2d3a;overflow-y:auto;padding:1rem}#card-panel[hidden]{display:none}body.path-open #card-panel{margin-right:320px}#graph-svg{width:100%;height:100%;display:block;background:#0f1117}.node circle{cursor:pointer;stroke-width:1.5px;transition:opacity .2s}.node text{font-size:11px;fill:#d0d8f0;pointer-events:none;-webkit-user-select:none;user-select:none}.link{stroke-opacity:.6;transition:opacity .2s}.node.dimmed circle{opacity:.15}.node.dimmed text{opacity:.1}.link.dimmed{opacity:.05}.node.unmastered circle{fill:#dc143c!important}.node.impacted circle{stroke:#ff8c00!important;stroke-width:3px!important;filter:drop-shadow(0 0 6px #FF8C00)}#search-box{position:absolute;top:12px;left:50%;transform:translate(-50%);z-index:10;width:280px}#search-input{width:100%;padding:.5rem .8rem;background:#1a1d27;border:1px solid #3a3d4a;border-radius:6px;color:#e0e0e0;font-size:.875rem;outline:none;transition:border-color .2s}#search-input:focus{border-color:#4a90d9}#search-results{list-style:none;background:#1a1d27;border:1px solid #3a3d4a;border-top:none;border-radius:0 0 6px 6px;max-height:200px;overflow-y:auto}#search-results li{padding:.4rem .8rem;cursor:pointer;font-size:.85rem;color:#c0c8e0}#search-results li:hover{background:#2a2d3a}#search-empty{padding:.4rem .8rem;font-size:.85rem;color:#7080a0;background:#1a1d27;border:1px solid #3a3d4a;border-top:none;border-radius:0 0 6px 6px}#context-menu{position:absolute;z-index:100;background:#1a1d27;border:1px solid #3a3d4a;border-radius:6px;box-shadow:0 4px 16px #00000080;min-width:120px}#context-menu[hidden]{display:none}#context-menu ul{list-style:none}#context-menu li{padding:.5rem 1rem;cursor:pointer;font-size:.875rem;color:#c0c8e0;transition:background .15s}#context-menu li:hover{background:#2a2d3a}.edge-tooltip{position:absolute;background:#1a1d27f2;border:1px solid #3a3d4a;border-radius:4px;padding:.3rem .6rem;font-size:.78rem;color:#c0c8e0;pointer-events:none;z-index:50}#card-panel{font-size:.875rem;line-height:1.6}.card-header{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:.75rem}.card-title{font-size:1.05rem;font-weight:600;color:#e8eaf6}.card-close{background:transparent;border:none;color:#7080a0;cursor:pointer;font-size:1.1rem;line-height:1;padding:0 .2rem}.card-close:hover{color:#e0e0e0}.card-meta{font-size:.78rem;color:#7080a0;margin-bottom:.75rem}.card-section{margin-bottom:.75rem}.card-section-title{font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;color:#7080a0;margin-bottom:.3rem}.card-definition{color:#c0c8e0}.card-formulas{background:#0f1117;border-radius:4px;padding:.5rem .75rem}.formula-item{margin-bottom:.6rem}.formula-label{font-size:.75rem;color:#7080a0;margin-bottom:.2rem}.formula-display{display:block;overflow-x:auto;overflow-y:hidden;padding:.3rem 0;text-align:center}.formula-display .katex-display{margin:0;overflow-x:auto;overflow-y:hidden}.formula-display .katex{font-size:1em}.card-properties ul{padding-left:1.2rem;color:#c0c8e0}.card-properties li{margin-bottom:.2rem}.card-mastery{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;margin-bottom:.75rem}.mastery-label{font-size:.78rem;color:#7080a0}.mastery-badge{padding:.15rem .5rem;border-radius:3px;font-size:.78rem}.mastery-badge.mastered{background:#1a3a1a;color:#50c878}.mastery-badge.unmastered{background:#3a1a1a;color:#dc143c}.mastery-badge.unmarked{background:#2a2d3a;color:#7080a0}.mastery-btn{padding:.2rem .6rem;border-radius:4px;border:1px solid #3a3d4a;background:transparent;color:#c0c8e0;cursor:pointer;font-size:.78rem;transition:border-color .15s,color .15s}.mastery-btn:hover{border-color:#4a90d9;color:#4a90d9}.mastery-btn.active-mastered{border-color:#50c878;color:#50c878}.mastery-btn.active-unmastered{border-color:#dc143c;color:#dc143c}.card-neighbors a{display:inline-block;margin:.15rem .3rem .15rem 0;padding:.15rem .5rem;background:#2a2d3a;border-radius:3px;color:#4a90d9;text-decoration:none;font-size:.8rem;cursor:pointer;transition:background .15s}.card-neighbors a:hover{background:#3a3d4a}.card-impact-sources{background:#2a1a0a;border:1px solid #FF8C00;border-radius:4px;padding:.5rem .75rem;margin-bottom:.75rem}.card-impact-sources .card-section-title{color:#ff8c00}.card-impact-sources ul{padding-left:1.2rem;color:#ffb060}#storage-warning{position:fixed;bottom:0;left:0;right:0;background:#3a2a0a;border-top:1px solid #FF8C00;color:#ffb060;font-size:.8rem;padding:.4rem 1rem;text-align:center;z-index:200}.card-viz{margin-bottom:.75rem}.card-viz svg{max-width:100%;height:auto}#path-panel{position:fixed;top:56px;right:0;width:320px;height:calc(100vh - 56px);background:#1a1f2e;border-left:1px solid #2a3050;display:flex;flex-direction:column;z-index:200;overflow:hidden;box-shadow:-4px 0 24px #0006}#path-panel[hidden]{display:none}.lp-header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px 12px;border-bottom:1px solid #2a3050;flex-shrink:0}.lp-title{font-size:.95rem;font-weight:600;color:#e0e8ff;letter-spacing:.02em}.lp-close{background:none;border:none;color:#89b;cursor:pointer;font-size:1rem;padding:2px 6px;border-radius:4px;transition:color .15s,background .15s}.lp-close:hover{color:#fff;background:#2a3050}.lp-summary{display:flex;gap:0;padding:12px 16px;border-bottom:1px solid #2a3050;flex-shrink:0}.lp-summary-item{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px}.lp-summary-num{font-size:1.5rem;font-weight:700;color:#c0d0ff;line-height:1}.lp-summary-label{font-size:.7rem;color:#67a}.lp-summary-item.lp-target .lp-summary-num{color:#ff7070}.lp-summary-item.lp-prereq .lp-summary-num{color:#ffb060}.lp-progress-bar{height:3px;background:#2a3050;flex-shrink:0}.lp-progress-fill{height:100%;background:linear-gradient(90deg,#4a90d9,#50c878);transition:width .4s ease}.lp-progress-label{font-size:.7rem;color:#67a;padding:4px 16px 8px;flex-shrink:0}.lp-steps{flex:1;overflow-y:auto;padding:8px 12px;display:flex;flex-direction:column;gap:6px}.lp-steps::-webkit-scrollbar{width:4px}.lp-steps::-webkit-scrollbar-track{background:transparent}.lp-steps::-webkit-scrollbar-thumb{background:#2a3050;border-radius:2px}.lp-step{display:flex;gap:10px;padding:10px;border-radius:8px;cursor:pointer;border:1px solid transparent;transition:background .15s,border-color .15s;background:#1e2438}.lp-step:hover{background:#242b42;border-color:#3a4570}.lp-step.lp-step-active{background:#1e2d4a;border-color:#4a90d9;box-shadow:0 0 0 1px #4a90d9 inset}.lp-step-index{width:22px;height:22px;border-radius:50%;background:#2a3050;color:#89b;font-size:.7rem;font-weight:600;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}.lp-step-active .lp-step-index{background:#4a90d9;color:#fff}.lp-step-body{flex:1;min-width:0}.lp-step-top{display:flex;align-items:center;gap:5px;margin-bottom:3px}.lp-tag{font-size:.62rem;padding:1px 5px;border-radius:3px;font-weight:600;letter-spacing:.02em}.lp-tag-target{background:#dc143c40;color:#ff7070;border:1px solid rgba(220,20,60,.4)}.lp-tag-prereq{background:#ff8c0033;color:#ffb060;border:1px solid rgba(255,140,0,.35)}.lp-step-book{font-size:.65rem;color:#67a;background:#2a3050;padding:1px 5px;border-radius:3px}.lp-step-status{margin-left:auto;font-size:.8rem}.lp-step-name{font-size:.88rem;color:#c8d8f8;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.lp-step-active .lp-step-name{color:#fff}.lp-step-section{font-size:.7rem;color:#56a;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:1px}.lp-unlock-tip{display:inline-block;margin-top:4px;font-size:.65rem;color:#50c878;background:#50c8781a;border:1px solid rgba(80,200,120,.25);padding:1px 6px;border-radius:3px}.lp-nav{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;border-top:1px solid #2a3050;flex-shrink:0}.lp-nav-btn{background:#2a3050;border:1px solid #3a4570;color:#89b;padding:5px 12px;border-radius:5px;cursor:pointer;font-size:.78rem;transition:background .15s,color .15s}.lp-nav-btn:hover:not(:disabled){background:#3a4570;color:#c0d0ff}.lp-nav-btn:disabled{opacity:.35;cursor:not-allowed}.lp-nav-pos{font-size:.78rem;color:#67a}.lp-empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:24px;text-align:center}.lp-empty-icon{font-size:2.5rem}.lp-empty p{color:#89b;font-size:.88rem;margin:0}.lp-empty-hint{color:#56a!important;font-size:.75rem!important;line-height:1.5}#btn-learning-path{background:linear-gradient(135deg,#1e3a5f,#2a4a7f);border:1px solid #4A90D9;color:#7ab8f5;padding:4px 12px;border-radius:5px;cursor:pointer;font-size:.8rem;font-weight:500;transition:background .15s,color .15s,box-shadow .15s}#btn-learning-path:hover{background:linear-gradient(135deg,#2a4a7f,#3a5a9f);color:#c0d8ff;box-shadow:0 0 8px #4a90d966}