:root{--bg-primary: #0d0d1f;--bg-card: #13132a;--bg-card-hover: #1a1a35;--color-sine: #40d080;--color-cosine: #4aabf7;--color-hyp: #ff5e5e;--color-wave: #f0c040;--color-accent: #6b6bff;--color-vec-b: #c77dff;--color-teal: #40e0a0;--color-subtract: #ee5a6f;--color-tangent: #ffb432;--color-cyan: #00d4ff;--text-primary: #e8e8ff;--text-muted: #6b7280;--border: #22224a;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif}@media(prefers-color-scheme:light){:root{--bg-primary: #f8f9ff;--bg-card: #ffffff;--bg-card-hover: #eef0fa;--text-primary: #0d0d1f;--text-muted: #6b6b9a;--border: #d0d0e8;--color-accent: #4a4acc;--color-sine: #1a8048;--color-cosine: #1464b4;--color-hyp: #cc2222;--color-wave: #906000;--color-tangent: #a06000;--color-subtract:#cc1a2e;--color-vec-b: #7c3aed;--color-teal: #1a9060;--color-cyan: #007aa0}.card-badge--done{background:#d4f4e2;color:#1a6640}.card-badge--progress{background:#dce8ff;color:#1a4480}.value-card--vectorb .value-card-value,#val-mag-b,#val-angle-b{color:#7c3aed}.value-card--resultant .value-card-value,#val-resultant-mag,#val-resultant-angle{color:#906000}.value-card--dotproduct .value-card-value,#val-dot-product,#val-angle-between,#val-projection{color:#007aa0}.value-card--crossproduct .value-card-value,#val-cross-product,#val-cross-angle,#val-cross-area{color:#1a9060}.value-card--dot .value-card-value,#dp-val-dot,#dp-val-angle,#dp-val-cos,#dp-val-proj{color:#1a8048}.btn-op-mode.active{background:#007aa026;color:#007aa0;border-color:#007aa0}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;background:var(--bg-primary);color:var(--text-primary);font-family:var(--font);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{cursor:pointer;font-family:var(--font)}canvas{display:block}.page-wrapper{min-height:100vh;display:flex;flex-direction:column}.container{max-width:1100px;margin:0 auto;padding:0 24px;width:100%}.nav{background:var(--bg-primary);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;padding:0 24px}.nav-inner{max-width:1100px;margin:0 auto;height:60px;display:flex;align-items:center;justify-content:space-between}.nav-logo{font-size:1.2rem;font-weight:700;color:var(--text-primary);letter-spacing:-.5px}.nav-logo span{color:var(--color-accent)}.nav-links{display:flex;gap:24px;align-items:center}.nav-link{color:var(--text-muted);font-size:.9rem;transition:color .2s}.nav-link:hover{color:var(--text-primary)}.nav-link-cta{background:var(--color-accent);color:#fff;padding:6px 16px;border-radius:8px;font-size:.875rem;font-weight:600;transition:opacity .2s}.nav-link-cta:hover{opacity:.85;color:#fff}.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}.nav-toggle-bar{display:block;width:22px;height:2px;background:var(--text-primary);border-radius:2px;transition:opacity .2s}@media(max-width:520px){.nav-toggle{display:flex}.nav{position:relative}.nav-links{display:none;position:absolute;top:60px;left:0;right:0;background:var(--bg-primary);border-bottom:1px solid var(--border);flex-direction:column;padding:16px 24px;gap:16px;z-index:99}.nav-links--open{display:flex}}.hero{padding:80px 24px 64px;text-align:center}.hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:700;line-height:1.15;margin-bottom:20px;color:var(--text-primary)}.hero-sub{font-size:1.1rem;color:var(--text-muted);max-width:560px;margin:0 auto 36px}.hero-search{max-width:400px;margin:1.5rem auto 0}.hero-search-input{width:100%;padding:10px 16px;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;color:var(--text-primary);font-size:.95rem;font-family:var(--font)}.hero-search-input::placeholder{color:var(--text-muted)}.hero-search-input:focus{outline:2px solid var(--color-accent)}.hero-search-field{display:flex;align-items:center;position:relative}.hero-search-btn{position:absolute;right:8px;background:none;border:none;color:var(--text-muted);font-size:1.2rem;padding:4px 8px;cursor:pointer;transition:color .2s}.hero-search-btn:hover{color:var(--text-primary)}.hero-search-hint{display:block;margin-top:8px;font-size:.8rem;color:var(--text-muted)}.btn-primary{display:inline-flex;align-items:center;gap:8px;background:var(--color-accent);color:#fff;padding:14px 28px;border-radius:10px;font-size:1rem;font-weight:600;border:none;transition:opacity .2s,transform .15s}.btn-primary:hover{opacity:.88;transform:translateY(-1px)}.section{padding:48px 24px}.section-heading{font-size:.75rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted);margin-bottom:24px}.concept-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:24px;transition:border-color .2s,transform .2s;cursor:pointer;display:flex;flex-direction:column;gap:12px;color:inherit;text-decoration:none}.concept-card:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.concept-card:hover{border-color:var(--color-accent);transform:translateY(-2px)}.concept-card--hidden{display:none}.concept-card--done{border-color:#40d08066;box-shadow:0 0 0 1px #40d08026;position:relative}.concept-card--progress{border-color:#60a5fa66;box-shadow:0 0 0 1px #60a5fa26;position:relative}.card-badge{position:absolute;top:.5rem;right:.5rem;font-size:.7rem;padding:.15rem .4rem;border-radius:4px;font-weight:600}.card-badge--done{background:#1a4a2e;color:#4ade80}.card-badge--progress{background:#1a2f4a;color:#60a5fa}.concept-card-title{font-size:1.05rem;font-weight:600;color:var(--text-primary)}.concept-card-subtitle{font-size:.85rem;color:var(--text-muted);line-height:1.5}.concept-card-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:auto}.badge{display:inline-block;font-size:.72rem;font-weight:600;padding:3px 8px;border-radius:5px;letter-spacing:.04em}.badge-math{background:#6b6bff26;color:var(--color-accent)}.badge-physics{background:#4aabf726;color:var(--color-cosine)}.badge-cs{background:#40d08026;color:var(--color-sine)}.badge-chem{background:#f0c04026;color:var(--color-wave)}.badge-bio{background:#ff5e5e26;color:var(--color-hyp)}.badge-default{background:#ffffff14;color:var(--text-muted)}.badge-calc{background:#fb923c26;color:#fb923c}.difficulty-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.difficulty-beginner{background:var(--color-sine)}.difficulty-intermediate{background:var(--color-wave)}.difficulty-advanced{background:var(--color-hyp)}.meta-time{font-size:.78rem;color:var(--text-muted)}.btn-explore{margin-top:4px;align-self:flex-start;display:inline-flex;align-items:center;gap:6px;font-size:.85rem;font-weight:600;color:var(--color-accent);background:transparent;border:1px solid var(--color-accent);border-radius:7px;padding:6px 14px;transition:background .2s,color .2s}.btn-explore:hover{background:var(--color-accent);color:#fff}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}.featured-card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;overflow:hidden;max-width:700px}.featured-canvas-wrap{width:100%;background:var(--bg-primary)}.featured-canvas-wrap canvas{width:100%;height:160px}.featured-card-body{padding:24px;display:flex;flex-direction:column;gap:12px}.featured-card-body h2{font-size:1.3rem;font-weight:700}.featured-card-body p{color:var(--text-muted);font-size:.9rem}.category-pills{display:flex;flex-wrap:wrap;gap:10px}.pill{padding:8px 18px;border-radius:100px;font-size:.875rem;font-weight:600;border:1px solid var(--border);background:var(--bg-card);color:var(--text-muted);cursor:pointer;transition:border-color .2s,color .2s,background .2s}.pill:hover,.pill.active{border-color:var(--color-accent);color:var(--color-accent);background:#6b6bff14}.paths-list{display:flex;flex-direction:column;gap:8px;max-width:480px}.path-item{display:flex;align-items:center;gap:16px;padding:14px 18px;background:var(--bg-card);border:1px solid var(--border);border-radius:10px;transition:border-color .2s,transform .2s;cursor:pointer}.path-item:hover{border-color:var(--color-accent);transform:translate(4px)}.path-arrow{color:var(--color-accent);font-weight:700;font-size:1.1rem}.path-info{display:flex;align-items:baseline;gap:10px}.path-title{font-weight:600;font-size:.95rem;color:var(--text-primary)}.path-count{font-size:.8rem;color:var(--text-muted)}.continue-section{padding:32px 0 0;display:flex;flex-direction:column;gap:16px}.continue-path-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:20px 24px;display:flex;flex-direction:column;gap:12px}.continue-path-info{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}.continue-path-title{font-weight:600;font-size:1rem;color:var(--text-primary)}.continue-path-stat{font-size:.8rem;color:var(--text-muted)}.continue-progress-bar{height:6px;background:var(--border);border-radius:3px;overflow:hidden}.continue-progress-fill{height:100%;background:var(--color-accent);border-radius:3px;transition:width .4s ease}.continue-concept-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:16px 24px;display:flex;align-items:center;gap:16px}.continue-concept-label{font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);white-space:nowrap}.continue-concept-link{display:flex;flex-direction:column;gap:2px;text-decoration:none;color:inherit}.continue-concept-link:hover .continue-concept-title{color:var(--color-accent)}.continue-concept-title{font-weight:600;font-size:.95rem;color:var(--text-primary);transition:color .2s}.continue-concept-sub{font-size:.8rem;color:var(--text-muted)}.explore-header{padding:48px 24px 24px}.explore-header h1{font-size:1.8rem;font-weight:700;margin-bottom:24px}.category-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:0}.cat-tab{padding:7px 16px;border-radius:8px;font-size:.875rem;font-weight:600;border:1px solid var(--border);background:transparent;color:var(--text-muted);cursor:pointer;transition:all .2s}.cat-tab:hover{color:var(--text-primary);border-color:var(--text-muted)}.cat-tab.active{background:var(--color-accent);border-color:var(--color-accent);color:#fff}.difficulty-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.diff-tab{padding:5px 14px;border-radius:8px;font-size:.8rem;font-weight:600;border:1.5px solid var(--border);background:transparent;color:var(--text-muted);cursor:pointer;transition:all .2s}.diff-tab:hover{color:var(--text-primary);border-color:var(--text-muted)}.diff-tab.active{background:var(--color-accent);border-color:var(--color-accent);color:#fff}.sort-wrap{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-top:12px}.sort-label{font-size:.8rem;color:var(--text-muted);margin-right:2px}.sort-btn{padding:5px 14px;border-radius:8px;font-size:.8rem;border:1px solid var(--border-color, #333);background:transparent;color:var(--text-muted);cursor:pointer;transition:all .2s}.sort-btn:hover{color:var(--text-primary);border-color:var(--text-muted)}.sort-btn.active{background:var(--color-accent);border-color:var(--color-accent);color:#fff}.search-wrap{margin-top:16px}.kbd-hint{margin:6px 0 0;font-size:.78rem;color:var(--text-muted)}.kbd-hint kbd{display:inline-block;padding:1px 6px;background:var(--bg-card-hover);border:1px solid var(--border);border-radius:4px;font-family:monospace;font-size:.78rem;color:var(--text-primary);box-shadow:0 1px 0 var(--border)}.concept-search{width:100%;max-width:400px;padding:8px 14px;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;color:var(--text-primary);font-size:.9rem}.concept-search:focus{outline:2px solid var(--color-accent)}.explore-grid-section{padding:24px}.concept-page{flex:1;padding-bottom:64px}.concept-breadcrumb{padding:16px 24px;max-width:1100px;margin:0 auto}.breadcrumb-link{font-size:.875rem;color:var(--text-muted);transition:color .2s}.breadcrumb-link:hover{color:var(--text-primary)}.concept-header{max-width:1100px;margin:0 auto;padding:0 24px 24px}.concept-header h1{font-size:clamp(1.5rem,3vw,2.2rem);font-weight:700;line-height:1.2;margin-bottom:10px}.concept-header-sub{color:var(--text-muted);font-size:1rem;margin-bottom:16px}.concept-meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:.85rem;color:var(--text-muted)}.concept-prerequisites{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:8px}.prereq-label{font-size:.8rem;color:var(--text-muted);flex-shrink:0}.prereq-tag{font-size:.78rem;padding:2px 10px;border-radius:20px;background:#ffffff12;color:var(--text-muted);border:1px solid var(--border)}.prereq-tag--link{color:var(--color-accent);border-color:#6b6bff4d;text-decoration:none}.prereq-tag--link:hover{background:#6b6bff1a}.canvas-container{width:100%;max-width:1100px;margin:0 auto;padding:0 24px}.canvas-wrap{width:100%;background:var(--bg-primary);border:1px solid var(--border);border-radius:12px;overflow:hidden;position:relative}.canvas-wrap canvas{width:100%;height:min(60vh,480px);display:block;touch-action:none}.canvas-loading{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:var(--bg-card);border-radius:12px;z-index:1}.canvas-loading-spinner{width:32px;height:32px;border:3px solid rgba(255,255,255,.1);border-top-color:var(--color-accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(prefers-reduced-motion:reduce){.canvas-loading-spinner{animation:none;opacity:.5}}.viz-skeleton{position:absolute;top:0;right:0;bottom:0;left:0;background:var(--bg-card);border-radius:8px;overflow:hidden;z-index:1}.viz-skeleton__shimmer{height:100%;background:linear-gradient(90deg,transparent 0%,rgba(128,128,200,.08) 50%,transparent 100%);background-size:200% 100%;animation:shimmer 1.5s infinite}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}@media(prefers-reduced-motion:reduce){.viz-skeleton__shimmer{animation:none}}.canvas-placeholder{width:100%;height:min(60vh,480px);display:flex;align-items:center;justify-content:center;background:var(--bg-card);border-radius:12px;color:var(--text-muted);font-size:1rem;border:1px solid var(--border)}.controls-row{max-width:1100px;margin:16px auto;padding:0 24px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}.btn-control{display:inline-flex;align-items:center;gap:8px;background:var(--bg-card);color:var(--text-primary);border:1px solid var(--border);border-radius:8px;padding:9px 18px;font-size:.9rem;font-weight:600;transition:border-color .2s,background .2s}.btn-control:hover{border-color:var(--color-accent);background:var(--bg-card-hover)}.btn-control.active{border-color:var(--color-accent);color:var(--color-accent)}.speed-wrap{display:flex;align-items:center;gap:10px;font-size:.85rem;color:var(--text-muted)}.speed-wrap input[type=range]{width:100px;accent-color:var(--color-accent)}.live-values{max-width:1100px;margin:0 auto 24px;padding:0 24px;display:grid;grid-template-columns:repeat(4,1fr);gap:12px}@media(max-width:600px){.live-values{grid-template-columns:repeat(2,1fr)}}.value-card{background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:14px 16px;text-align:center}.value-card-label{font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);margin-bottom:6px}.value-card-value{font-size:1.3rem;font-weight:700;font-variant-numeric:tabular-nums;color:var(--text-primary)}#val-sine{color:var(--color-sine)}#val-cos{color:var(--color-cosine)}#val-angle{color:var(--color-wave)}#val-rad{color:var(--text-primary)}#val-mag{color:var(--color-hyp)}#val-vec-angle{color:var(--color-wave)}#val-x{color:var(--color-cosine)}#val-y{color:var(--color-sine)}.value-card--vectorb .value-card-value{color:#c77dff}.value-card--resultant .value-card-value{color:#f0c040}#val-mag-b,#val-angle-b{color:#c77dff}#val-resultant-mag,#val-resultant-angle{color:#f0c040}.value-card--dotproduct .value-card-value,#val-dot-product,#val-angle-between,#val-projection{color:#00d4ff}.value-card--crossproduct .value-card-value,#val-cross-product,#val-cross-angle,#val-cross-area{color:#40e0a0}.value-card--dot .value-card-value,#dp-val-dot,#dp-val-angle,#dp-val-cos,#dp-val-proj{color:#40d080}.op-mode-group{display:flex;gap:4px;margin-left:8px}.btn-op-mode{font-size:.8rem;padding:4px 10px;border:1px solid var(--border);background:transparent;color:var(--text-muted);cursor:pointer;transition:all .2s}.btn-op-mode.active{background:#00d4ff26;color:#00d4ff;border-color:#00d4ff}.vec-b-controls,.vec-b-values{border-top:1px solid var(--border);padding-top:8px}.formula-box{max-width:1100px;margin:0 auto 24px;padding:0 24px}.formula-inner{background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:18px 24px;font-size:1rem;font-family:Courier New,monospace;color:var(--text-primary)}.formula-label{font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);margin-bottom:8px;font-family:var(--font)}.formula-val{color:var(--color-sine);font-weight:700}.share-bar{max-width:1100px;margin:0 auto;padding:12px 24px;display:flex;align-items:center;gap:10px;border-top:1px solid var(--border)}.share-label{color:var(--text-muted);font-size:.85rem;flex-shrink:0}.share-btn{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border:1px solid var(--border);border-radius:6px;background:transparent;color:var(--text-muted);font-size:.85rem;font-family:var(--font);cursor:pointer;transition:border-color .2s,color .2s;text-decoration:none;white-space:nowrap}.share-btn:hover{border-color:var(--text-primary);color:var(--text-primary)}.steps-section{max-width:1100px;margin:0 auto 32px;padding:0 24px}.steps-section h2{font-size:1rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);margin-bottom:20px}.steps-list{display:flex;flex-direction:column;gap:16px}.step-item{display:flex;gap:16px;align-items:flex-start;border-left:3px solid transparent;padding-left:calc(1.25rem - 3px);transition:background .3s ease,border-color .3s ease}.step-num{width:28px;height:28px;border-radius:50%;background:var(--bg-card);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:700;color:var(--color-accent);flex-shrink:0}.step-content h3{font-size:.95rem;font-weight:600;margin-bottom:4px}.step-content p{font-size:.875rem;color:var(--text-muted)}.step-item--active{background:#40d08014;border-color:var(--color-sine)}.step-item--active .step-num{background:var(--color-sine);color:var(--bg-primary)}.resume-badge{display:inline-block;font-size:.7rem;font-weight:600;padding:2px 7px;border-radius:10px;background:#40d0801f;color:var(--color-sine);border:1px solid rgba(64,208,128,.3);margin-bottom:6px;letter-spacing:.02em}.takeaways-section{max-width:1100px;margin:0 auto 32px;padding:0 24px}.takeaways-section h2{font-size:1rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);margin-bottom:20px}.takeaways-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}.takeaway-card{background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:18px}.takeaway-card h3{font-size:.9rem;font-weight:700;color:var(--color-accent);margin-bottom:6px}.takeaway-card p{font-size:.82rem;color:var(--text-muted);line-height:1.5}.connections-section{max-width:1100px;margin:0 auto 48px;padding:0 24px}.connections-section h2{font-size:1rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);margin-bottom:20px}.connections-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}.connection-card{background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:16px;cursor:pointer;transition:border-color .2s,transform .2s;color:inherit;text-decoration:none;display:block}.connection-card:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.connection-card:hover{border-color:var(--color-accent);transform:translateY(-2px)}.connection-card h3{font-size:.9rem;font-weight:700;color:var(--text-primary);margin-bottom:4px}.connection-card p{font-size:.8rem;color:var(--text-muted);line-height:1.45}.connection-card--disabled{opacity:.5;cursor:default}.connection-card--disabled:hover{border-color:var(--border);transform:none}.badge-coming-soon{background:#ffffff14;color:var(--text-muted);font-size:.65rem;font-weight:600;padding:2px 7px;border-radius:4px;vertical-align:middle;margin-left:6px}.completion-cta{max-width:1100px;margin:0 auto 32px;padding:0 24px;text-align:center}.completion-done{display:inline-flex;align-items:center;gap:12px;background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:14px 24px;font-size:.95rem;color:var(--text-primary)}.completion-check{font-size:1.2rem;color:var(--color-accent);font-weight:700}.btn-secondary{display:inline-flex;align-items:center;background:transparent;color:var(--text-muted);padding:6px 14px;border-radius:8px;font-size:.85rem;font-weight:600;border:1px solid var(--border);cursor:pointer;transition:border-color .2s,color .2s}.btn-secondary:hover{border-color:var(--color-accent);color:var(--text-primary)}.skip-link{position:absolute;top:-100%;left:8px;background:var(--color-accent);color:#fff;padding:8px 16px;border-radius:0 0 8px 8px;font-weight:600;font-size:.9rem;z-index:9999;text-decoration:none;transition:top .2s}.skip-link:focus{top:0}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.footer{border-top:1px solid var(--border);padding:24px;text-align:center;font-size:.85rem;color:var(--text-muted);margin-top:auto}.fullscreen-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;background:var(--bg-primary);flex-direction:column}.fullscreen-overlay.active{display:flex}.fullscreen-canvas-wrap{flex:1;position:relative;min-height:0}.fullscreen-canvas-wrap canvas{width:100%;height:100%;display:block;touch-action:none}.fullscreen-controls{padding:12px 24px;display:flex;align-items:center;gap:16px;border-top:1px solid var(--border);background:var(--bg-primary);flex-wrap:wrap}.fullscreen-values{display:flex;gap:20px;align-items:center;flex-wrap:wrap}.fs-val-item{display:flex;gap:5px;align-items:baseline}.fs-val-label{font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted)}.fs-val-num{font-size:1rem;font-weight:700;font-variant-numeric:tabular-nums;color:var(--text-primary)}.fs-exit-btn{margin-left:auto}.kb-hints{max-width:1100px;margin:0 auto 16px;padding:0 24px}.kb-hints summary{cursor:pointer;list-style:none;font-size:.85rem;color:var(--text-muted);-webkit-user-select:none;user-select:none;display:inline-flex;align-items:center;gap:6px;padding:4px 0;transition:color .2s}.kb-hints summary::-webkit-details-marker{display:none}.kb-hints[open] summary{color:var(--text-primary)}.kb-hints summary:hover{color:var(--text-primary)}.kb-grid{display:grid;grid-template-columns:auto 1fr;gap:8px 14px;padding:12px 16px;margin-top:8px;background:var(--bg-card);border:1px solid var(--border);border-radius:10px}.kb-grid kbd{display:inline-flex;align-items:center;justify-content:center;background:var(--bg-card-hover);border:1px solid var(--border);border-radius:5px;padding:2px 8px;font-size:.78rem;font-family:monospace;color:var(--text-primary);white-space:nowrap;box-shadow:0 1px 0 var(--border);align-self:center}.kb-grid span{font-size:.82rem;color:var(--text-muted);align-self:center}@media(pointer:coarse){.kb-hints,.kbd-hint{display:none}}.path-page{max-width:800px;margin:0 auto;padding:32px 24px 48px;flex:1}.path-header{margin-bottom:32px}.path-header h1{font-size:2rem;font-weight:700;margin-bottom:10px}.path-header-desc{color:var(--text-muted);font-size:1.05rem}.path-cta{margin-bottom:36px}.btn-disabled{opacity:.5;cursor:default;pointer-events:none}.path-concepts{display:flex;flex-direction:column;gap:12px}.path-concept-item{display:flex;align-items:flex-start;gap:16px;padding:18px 20px;border-radius:12px;border:1px solid var(--border);background:var(--bg-card);transition:background .2s,border-color .2s;text-decoration:none;color:var(--text-primary)}a.path-concept-item:hover{background:var(--bg-card-hover);border-color:var(--color-accent)}.path-concept-item--unavailable{opacity:.45;cursor:default}.path-concept-item--done{border-left:3px solid var(--color-sine)}.path-concept-num--done{background:var(--color-sine);color:#0a0a1a}.path-progress{height:8px;border-radius:4px;background:var(--border);overflow:hidden;margin-top:16px}.path-progress-bar{height:100%;background:var(--color-sine);border-radius:4px;transition:width .3s ease}.path-progress-label{font-size:.85rem;color:var(--text-muted);margin-top:6px;display:block}.path-complete-msg{color:var(--color-sine);font-weight:600;margin-top:8px;font-size:.95rem}.path-concept-num{min-width:32px;height:32px;border-radius:50%;background:var(--color-accent);color:#fff;font-size:.85rem;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}.path-concept-num--disabled{background:var(--border);color:var(--text-muted)}.path-concept-info{display:flex;flex-direction:column;gap:4px}.path-concept-title{font-weight:600;font-size:1rem}.path-concept-subtitle{color:var(--text-muted);font-size:.88rem}.path-concept-meta{display:flex;align-items:center;gap:8px;margin-top:4px}.path-nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 24px;border-top:1px solid var(--border);background:var(--bg-card);font-size:.9rem}.path-nav-prev,.path-nav-next{flex:1;color:var(--color-accent);font-weight:500;transition:opacity .2s}a.path-nav-prev:hover,a.path-nav-next:hover{opacity:.8}.path-nav-next{text-align:right}.path-nav-badge{flex:0 0 auto;background:#6b6bff26;color:var(--color-accent);padding:4px 12px;border-radius:20px;font-size:.8rem;font-weight:600;text-align:center;white-space:nowrap}.path-nav-disabled{flex:1;color:var(--text-muted);opacity:.5}.path-nav-disabled.path-nav-next{text-align:right}@media(max-width:768px){.hero{padding:48px 16px 40px}.hero h1{font-size:1.8rem}.section{padding:32px 16px}.live-values{grid-template-columns:repeat(2,1fr)}.controls-row{gap:10px}}:focus-visible{outline:2px solid var(--color-accent);outline-offset:3px;border-radius:4px}@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;animation:none!important}}.graph-header-section{padding-top:48px;padding-bottom:24px}.graph-header-section h1{font-size:2rem;margin-bottom:8px}.graph-subtitle{color:var(--text-muted);font-size:1rem;margin-bottom:20px}.graph-legend{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:8px;list-style:none}.graph-legend-item{display:flex;align-items:center;gap:6px;font-size:.82rem;color:var(--text-muted)}.graph-legend-dot{width:12px;height:12px;border-radius:50%;flex-shrink:0}.graph-legend-dot--muted{background:var(--text-muted);opacity:.45;border:1px dashed rgba(255,255,255,.3)}.graph-wrap{width:100%;overflow-x:auto;overflow-y:hidden;min-width:500px;padding-bottom:32px;position:relative;cursor:grab}.graph-zoom-controls{display:flex;gap:6px;padding:8px 12px;justify-content:flex-end}.graph-btn{background:var(--bg-card);border:1px solid var(--border);color:var(--text-primary);border-radius:6px;width:32px;height:32px;font-size:1.1rem;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s,border-color .15s}.graph-btn:hover{background:var(--bg-hover, rgba(255,255,255,.08));border-color:var(--color-accent)}.graph-btn:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.graph-wrap:active{cursor:grabbing}#concept-graph{display:block;max-width:100%;height:auto}.graph-scroll-hint{display:none;text-align:center;color:var(--text-muted);font-size:.75rem;padding:.25rem 0}@media(pointer:coarse){.graph-scroll-hint{display:block}}.graph-col-header{fill:var(--text-muted);font-size:12px;font-weight:600;letter-spacing:.04em;text-transform:uppercase}.graph-edge-conn{stroke:var(--text-muted);stroke-width:1;stroke-opacity:.25}.graph-edge-prereq{stroke:var(--text-muted);stroke-width:1.5;stroke-opacity:.4;stroke-dasharray:5 4}.graph-node circle{transition:filter .15s}.graph-node-link{outline:none}.graph-node-link:focus-visible .graph-node circle,.graph-node:hover circle{filter:brightness(1.25)}.graph-node-link:focus,.graph-node-link:focus-visible{outline:none}.graph-node-link:focus circle,.graph-node-link:focus-visible circle{stroke:var(--color-focus, #60a5fa);stroke-width:3}.graph-node--coming-soon{cursor:default;pointer-events:none}.graph-tooltip{position:fixed;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;padding:10px 14px;font-size:.82rem;max-width:200px;pointer-events:none;z-index:200;display:none;line-height:1.4;box-shadow:0 4px 16px #0006}.graph-tooltip strong{display:block;color:var(--text-primary);font-size:.88rem;margin-bottom:3px}.graph-tooltip-sub{display:block;color:var(--text-muted);font-size:.78rem}.graph-tooltip-soon{display:inline-block;margin-top:4px;font-size:.72rem;color:var(--text-muted);background:#ffffff0f;border-radius:4px;padding:1px 6px}@media(pointer:coarse){.graph-wrap{cursor:default;overflow-x:scroll;-webkit-overflow-scrolling:touch}}.not-found-body{padding:64px 24px;text-align:center}.not-found-heading{margin-bottom:16px}.btn-inline-flex{display:inline-flex}.canvas-error{padding:16px;color:var(--text-muted);text-align:center}.viz-error{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:200px;gap:1rem;color:var(--text-muted);text-align:center}.viz-error button{display:inline-flex;align-items:center;background:transparent;border:1.5px solid var(--border-color);color:var(--text-secondary);padding:8px 20px;border-radius:8px;font-size:.9rem;font-weight:600;cursor:pointer;transition:border-color .2s,color .2s}.viz-error button:hover{border-color:var(--color-accent);color:var(--text-primary)}.explore-no-results{color:var(--text-muted);grid-column:1 / -1}.empty-state{grid-column:1 / -1;text-align:center;padding:4rem 2rem;color:var(--text-muted)}.empty-state h3{font-size:1.25rem;margin-bottom:.5rem}.empty-state__icon{font-size:3rem;margin-bottom:1rem}.btn-primary--self-start{align-self:flex-start}.btn-ghost{background:var(--bg-card)}.not-found-main{padding:80px 24px;text-align:center}.not-found-code{font-size:4rem;margin-bottom:16px}.not-found-h1{margin-bottom:12px}.not-found-desc{color:var(--text-muted);margin-bottom:32px;max-width:420px;margin-left:auto;margin-right:auto}.not-found-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.graph-legend-dot--trig{background:var(--color-sine)}.graph-legend-dot--calc{background:var(--color-wave)}.graph-legend-dot--linalg{background:var(--color-cosine)}.graph-legend-dot--physics{background:var(--color-hyp)}.graph-legend-dot--done{background:#40d080;box-shadow:0 0 4px #40d08080}.graph-node--done circle{stroke:#40d080;stroke-width:3;filter:drop-shadow(0 0 6px rgba(64,208,128,.6))}.graph-tooltip-done{display:inline-block;margin-top:4px;font-size:.72rem;color:#40d080;background:#40d0801a;border-radius:4px;padding:1px 6px}.graph-search-wrap{margin-bottom:20px}.graph-search{width:100%;max-width:360px;padding:9px 14px;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;color:var(--text-primary);font-size:.95rem;font-family:var(--font);outline:none;transition:border-color .15s}.graph-search::placeholder{color:var(--text-muted)}.graph-search:focus{border-color:var(--color-accent)}.graph-node--dim circle{opacity:.2}.graph-node--dim text{opacity:.2}.graph-node--highlight circle{filter:drop-shadow(0 0 8px var(--color-sine));stroke-width:3}.color-hyp{color:var(--color-hyp)}.color-sine{color:var(--color-sine)}.color-cosine{color:var(--color-cosine)}.color-wave{color:var(--color-wave)}.color-vec-b{color:var(--color-vec-b)}.color-teal{color:var(--color-teal)}.color-subtract{color:var(--color-subtract)}.color-tangent{color:var(--color-tangent)}.color-cyan{color:var(--color-cyan)}.controls-row--wrap{gap:16px;flex-wrap:wrap}.formula-flex-row{display:flex;gap:24px;flex-wrap:wrap;justify-content:center}.progress-heading{font-size:clamp(1.6rem,4vw,2.2rem);font-weight:800;letter-spacing:-.02em;color:var(--text-primary);margin-bottom:8px}.progress-stat-line{font-size:1rem;color:var(--text-muted);margin-bottom:16px}.progress-stat-line strong{color:var(--text-primary);font-weight:700}.streak-badge{display:inline-flex;align-items:center;gap:6px;background:color-mix(in srgb,var(--color-hyp) 15%,transparent);border:1px solid color-mix(in srgb,var(--color-hyp) 40%,transparent);color:var(--color-hyp);border-radius:999px;padding:4px 14px 4px 10px;font-size:.9rem;font-weight:600;margin-bottom:16px}.streak-flame{font-size:1rem;line-height:1}.streak-count{font-size:1.05rem;font-weight:700}.streak-label{font-weight:500}.progress-bar{height:10px;background:var(--border);border-radius:5px;overflow:hidden}.progress-fill{height:100%;background:var(--color-accent);border-radius:5px;transition:width .4s ease}.progress-categories{display:grid;gap:24px}.progress-category{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:20px 24px}.progress-category-header{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:10px}.progress-category-name{font-weight:700;font-size:.95rem;color:var(--text-primary)}.progress-category-stat{font-size:.8rem;color:var(--text-muted)}.progress-concept-list{list-style:none;margin-top:14px;display:flex;flex-direction:column;gap:6px}.progress-concept-item{display:flex}.progress-concept-link{display:flex;align-items:center;gap:10px;padding:6px 8px;border-radius:8px;text-decoration:none;color:var(--text-muted);font-size:.9rem;transition:background .15s,color .15s;width:100%}.progress-concept-link:hover{background:var(--bg-card-hover);color:var(--text-primary)}.progress-concept-link--done{color:var(--text-primary)}.progress-concept-check{font-size:.85rem;width:18px;text-align:center;flex-shrink:0;color:var(--color-sine)}.progress-concept-link:not(.progress-concept-link--done) .progress-concept-check{color:var(--border)}.progress-concept-name{flex:1}.progress-recent-list{list-style:none;display:flex;flex-direction:column;gap:8px}.progress-recent-item{display:flex;flex-direction:column;gap:2px;padding:12px 16px;background:var(--bg-card);border:1px solid var(--border);border-radius:10px;text-decoration:none;color:inherit;transition:border-color .2s,background .2s}.progress-recent-item:hover{background:var(--bg-card-hover);border-color:var(--color-accent)}.progress-recent-title{font-weight:600;font-size:.95rem;color:var(--text-primary)}.progress-recent-sub{font-size:.82rem;color:var(--text-muted)}.progress-empty-state{display:flex;flex-direction:column;gap:16px;padding:32px 0}.progress-empty-msg{color:var(--text-muted);font-size:1rem}.progress-congrats{text-align:center;padding:40px 0}.progress-congrats-icon{font-size:3rem;margin-bottom:12px}.progress-congrats-title{font-size:1.5rem;font-weight:800;color:var(--color-sine);margin-bottom:8px}.progress-congrats-sub{color:var(--text-muted);max-width:480px;margin:0 auto}.progress-heading-row{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:8px;flex-wrap:wrap}.progress-heading-row .progress-heading{margin-bottom:0}.progress-export-btn{background:transparent;border:1px solid var(--color-accent);color:var(--color-accent);padding:8px 16px;border-radius:8px;font-size:.875rem;font-weight:600;cursor:pointer;transition:background .15s,color .15s;white-space:nowrap;flex-shrink:0}.progress-export-btn:hover{background:var(--color-accent);color:#fff}.progress-toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%) translateY(16px);background:var(--bg-card);border:1px solid var(--color-accent);color:var(--text-primary);padding:12px 20px;border-radius:10px;font-size:.9rem;z-index:9999;pointer-events:none;opacity:0;transition:opacity .2s,transform .2s;max-width:calc(100vw - 48px);text-align:center}.progress-toast--visible{opacity:1;transform:translate(-50%) translateY(0)}.progress-toast--error{border-color:var(--color-subtract);color:var(--color-subtract)}.export-fallback{background:var(--color-surface, #1a1a2e);border:1px solid var(--color-border, #333);border-radius:8px;padding:12px 16px;margin-bottom:16px}.export-fallback p{margin:0 0 8px;font-size:.9rem;color:var(--color-text-secondary, #aaa)}.export-fallback-input{width:100%;box-sizing:border-box;background:var(--color-bg, #0d0d1a);border:1px solid var(--color-border, #444);border-radius:4px;color:var(--color-text, #fff);font-family:monospace;font-size:.8rem;padding:6px 8px}.import-confirm-banner{background:color-mix(in srgb,#f0a500 12%,var(--bg-card));border:1px solid #f0a500;border-radius:10px;padding:16px 20px;margin-bottom:24px}.import-confirm-msg{margin:0 0 14px;color:var(--color-wave);font-size:.95rem;line-height:1.5}.import-confirm-actions{display:flex;gap:10px;flex-wrap:wrap}.dot-formula-row{margin-top:6px}.recommend-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}.recommend-card{background:var(--bg-card);border:1px solid var(--color-accent);border-radius:10px;padding:16px;text-decoration:none;color:inherit;display:block;transition:border-color .2s,transform .2s}.recommend-card:hover{transform:translateY(-2px);border-color:var(--color-sine)}.recommend-card:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.recommend-card-title{font-size:.95rem;font-weight:700;color:var(--text-primary);margin-bottom:4px}.recommend-card-sub{font-size:.82rem;color:var(--text-muted);margin-bottom:8px}.recommend-card-reason{font-size:.75rem;color:var(--color-accent);font-weight:600}.up-next-section{max-width:1100px;margin:0 auto 48px;padding:0 24px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}.up-next-label{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);white-space:nowrap}.up-next-card{display:flex;flex-direction:column;gap:2px;background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:12px 16px;text-decoration:none;color:inherit;transition:border-color .2s,transform .2s;min-width:200px;max-width:420px}.up-next-card:hover{border-color:var(--color-accent);transform:translateY(-2px)}.up-next-card:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.up-next-title{font-size:.9rem;font-weight:700;color:var(--text-primary)}.up-next-sub{font-size:.78rem;color:var(--text-muted)}.quiz-prompt{display:flex;gap:.75rem;margin-top:1rem;flex-wrap:wrap}.quiz-panel{margin-top:1.5rem;background:var(--card-bg, #1a1a2e);border:1px solid var(--border-color, rgba(255,255,255,.1));border-radius:12px;padding:1.5rem;max-width:640px}.quiz-progress{font-size:.78rem;color:var(--text-muted);margin-bottom:.75rem;text-transform:uppercase;letter-spacing:.05em}.quiz-question{font-size:1.05rem;font-weight:600;color:var(--text-primary);margin:0 0 1.25rem;line-height:1.45}.quiz-options{display:flex;flex-direction:column;gap:.5rem;margin-bottom:1rem}.quiz-option{background:transparent;border:1px solid var(--border-color, rgba(255,255,255,.15));border-radius:8px;padding:.7rem 1rem;text-align:left;color:var(--text-primary);font-size:.95rem;cursor:pointer;transition:background .15s,border-color .15s}.quiz-option:hover:not(:disabled){background:#ffffff0f;border-color:var(--accent, #6c63ff)}.quiz-option:focus-visible{outline:2px solid var(--accent, #6c63ff);outline-offset:2px}.quiz-option--correct{background:#22c55e26;border-color:#22c55e;color:#22c55e}.quiz-option--incorrect{background:#ef444426;border-color:#ef4444;color:#ef4444}.quiz-feedback{font-size:.9rem;min-height:1.4em;margin-bottom:.75rem}.quiz-feedback--correct{color:#22c55e}.quiz-feedback--incorrect{color:#ef4444}.quiz-next{margin-top:.25rem}.quiz-results{display:flex;flex-direction:column;gap:1rem}.quiz-results-score{font-size:1.4rem;font-weight:700;color:var(--text-primary)}.quiz-score-bar{height:8px;background:#ffffff1a;border-radius:4px;overflow:hidden}.quiz-score-fill{height:100%;background:var(--accent, #6c63ff);border-radius:4px;transition:width .4s ease}.quiz-results-actions{display:flex;gap:.75rem;flex-wrap:wrap}.badge-score{display:inline-flex;align-items:center;gap:.25rem;padding:.15rem .5rem;border-radius:999px;font-size:.72rem;font-weight:600;background:#6c63ff26;color:var(--accent, #6c63ff);border:1px solid rgba(108,99,255,.3);white-space:nowrap}mark{background:#f0c04059;color:inherit;border-radius:2px;padding:0 1px}