:root{--bg-primary:#0a0e1a;--bg-secondary:#111827;--bg-card:#1a1f35;--bg-card-hover:#222845;--bg-surface:#151a2e;--bg-elevated:#1e2440;--text-primary:#f0f2f8;--text-secondary:#94a3b8;--text-muted:#64748b;--text-accent:#38bdf8;--accent-blue:#3b82f6;--accent-cyan:#06b6d4;--accent-purple:#8b5cf6;--accent-green:#10b981;--accent-amber:#f59e0b;--accent-red:#ef4444;--accent-pink:#ec4899;--gradient-primary:linear-gradient(135deg, #3b82f6, #8b5cf6);--gradient-warm:linear-gradient(135deg, #f59e0b, #ef4444);--gradient-cool:linear-gradient(135deg, #06b6d4, #3b82f6);--gradient-hero:linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #0f172a 100%);--border-color:#94a3b81a;--border-hover:#94a3b833;--shadow-sm:0 1px 2px #0000004d;--shadow-md:0 4px 12px #0006;--shadow-lg:0 8px 32px #00000080;--shadow-glow-blue:0 0 20px #3b82f626;--shadow-glow-purple:0 0 20px #8b5cf626;--font-sans:"Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", monospace;--space-xs:4px;--space-sm:8px;--space-md:16px;--space-lg:24px;--space-xl:32px;--space-2xl:48px;--space-3xl:64px;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--ease-out:cubic-bezier(.16, 1, .3, 1);--ease-spring:cubic-bezier(.34, 1.56, .64, 1);--transition-fast:.15s var(--ease-out);--transition-normal:.25s var(--ease-out);--transition-slow:.4s var(--ease-out)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6;overflow-x:hidden}#app{min-height:100vh}a{color:inherit;text-decoration:none}button{cursor:pointer;font-family:inherit;font-size:inherit;background:0 0;border:none}.container{max-width:1200px;padding:0 var(--space-lg);margin:0 auto}.mono{font-family:var(--font-mono)}.badge{border-radius:var(--radius-full);letter-spacing:.03em;text-transform:uppercase;align-items:center;padding:4px 12px;font-size:.75rem;font-weight:600;display:inline-flex}.badge--blue{color:var(--accent-blue);background:#3b82f626}.badge--green{color:var(--accent-green);background:#10b98126}.badge--purple{color:var(--accent-purple);background:#8b5cf626}.badge--amber{color:var(--accent-amber);background:#f59e0b26}.landing-hero{text-align:center;padding:var(--space-3xl) var(--space-lg);background:var(--gradient-hero);position:relative;overflow:hidden}.landing-hero:before{content:"";background:radial-gradient(at 30%,#3b82f614 0%,#0000 50%),radial-gradient(at 70%,#8b5cf614 0%,#0000 50%);width:200%;height:200%;animation:8s ease-in-out infinite alternate heroGlow;position:absolute;top:-50%;left:-50%}@keyframes heroGlow{0%{transform:translate(0)scale(1)}to{transform:translate(-5%,3%)scale(1.05)}}.landing-hero__tag{align-items:center;gap:var(--space-sm);border-radius:var(--radius-full);color:var(--accent-purple);margin-bottom:var(--space-lg);letter-spacing:.04em;text-transform:uppercase;background:#8b5cf61f;border:1px solid #8b5cf640;padding:6px 16px;font-size:.8rem;font-weight:500;display:inline-flex;position:relative}.landing-hero__tag:before{content:"";background:var(--accent-purple);border-radius:50%;width:6px;height:6px;animation:2s ease-in-out infinite pulse}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.8)}}.landing-hero__title{letter-spacing:-.03em;margin-bottom:var(--space-lg);font-size:clamp(2.5rem,5vw,4rem);font-weight:800;line-height:1.1;position:relative}.landing-hero__title span{background:var(--gradient-primary);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.landing-hero__subtitle{color:var(--text-secondary);max-width:600px;margin:0 auto;font-size:1.15rem;line-height:1.7;position:relative}.cat-section{padding:var(--space-xl) var(--space-lg) var(--space-3xl)}.cat-grid{gap:var(--space-lg);grid-template-columns:repeat(2,1fr);max-width:900px;margin:0 auto;display:grid}.cat-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-xl) var(--space-xl) var(--space-lg);cursor:pointer;transition:all var(--transition-normal);gap:var(--space-md);flex-direction:column;display:flex;position:relative;overflow:hidden}.cat-card:before{content:"";border-radius:var(--radius-lg) var(--radius-lg) 0 0;opacity:0;height:3px;transition:opacity var(--transition-normal);position:absolute;top:0;left:0;right:0}.cat-card--hld:before{background:linear-gradient(90deg,#8b5cf6,#6366f1)}.cat-card--dsa:before{background:linear-gradient(90deg,#10b981,#34d399)}.cat-card--lld:before{background:linear-gradient(90deg,#f59e0b,#fbbf24)}.cat-card--tools:before{background:linear-gradient(90deg,#3b82f6,#60a5fa)}.cat-card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-lg), var(--shadow-glow-blue);transform:translateY(-6px)}.cat-card:hover:before{opacity:1}.cat-card__icon{border-radius:var(--radius-md);justify-content:center;align-items:center;width:56px;height:56px;font-size:1.8rem;display:flex}.cat-card--hld .cat-card__icon{background:#8b5cf61f}.cat-card--dsa .cat-card__icon{background:#10b9811f}.cat-card--lld .cat-card__icon{background:#f59e0b1f}.cat-card--tools 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var(--transition-normal);font-size:1.2rem;position:absolute}.viz-card:hover .viz-card__arrow{color:var(--accent-blue);transform:translate(4px)}.viz-page{flex-direction:column;min-height:100vh;display:flex}.viz-topbar{align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-lg);background:var(--bg-secondary);border-bottom:1px solid var(--border-color);z-index:100;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);display:flex;position:sticky;top:0}.viz-topbar__back{align-items:center;gap:var(--space-sm);color:var(--text-secondary);border-radius:var(--radius-sm);transition:all var(--transition-fast);padding:6px 12px;font-size:.85rem;font-weight:500;display:flex}.viz-topbar__back:hover{color:var(--text-primary);background:var(--bg-elevated)}.viz-topbar__title{color:var(--text-primary);font-size:.95rem;font-weight:600}.viz-topbar__divider{background:var(--border-color);width:1px;height:20px}.footer{text-align:center;padding:var(--space-2xl) 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#3b82f61f;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;font-size:1.4rem;transition:background .25s,border-color .25s;display:flex}.pf-section-card:hover .pf-section-card__icon{background:#3b82f624;border-color:#3b82f640}.pf-section-card__title{color:var(--text-primary);letter-spacing:-.01em;margin:0;font-size:1.2rem;font-weight:700}.pf-section-card__desc{color:var(--text-muted);margin:0;font-size:.875rem;line-height:1.6}.pf-section-card__meta{color:var(--text-muted);border-top:1px solid #ffffff0a;justify-content:space-between;align-items:center;margin-top:auto;padding-top:.75rem;font-size:.78rem;font-weight:500;display:flex}.pf-section-card__meta .pf-arrow{color:var(--accent-blue);align-items:center;gap:.3rem;font-weight:600;transition:transform .25s,gap .25s;display:inline-flex}.pf-section-card:hover .pf-section-card__meta .pf-arrow{gap:.55rem}.pf-section-card--viz{border-left-color:#6366f166}.pf-section-card--viz:hover{border-left-color:var(--accent-purple);box-shadow:0 4px 12px #0000004d,0 12px 48px #8b5cf614,0 0 0 1px #8b5cf60f,inset 0 1px #ffffff0d}.pf-section-card--viz .pf-section-card__icon{color:var(--accent-purple);background:#8b5cf614;border-color:#8b5cf61f}.pf-section-card--viz:hover .pf-section-card__icon{background:#8b5cf624;border-color:#8b5cf640}.pf-section-card--viz .pf-section-card__meta .pf-arrow{color:var(--accent-purple)}.pf-section-card--board{border-left-color:#10b98159}.pf-section-card--board:hover{border-left-color:var(--accent-green);box-shadow:0 4px 12px #0000004d,0 12px 48px #10b98114,0 0 0 1px #10b9810f,inset 0 1px #ffffff0d}.pf-section-card--board .pf-section-card__icon{color:var(--accent-green);background:#10b98114;border-color:#10b9811f}.pf-section-card--board:hover .pf-section-card__icon{background:#10b98124;border-color:#10b98140}.pf-section-card--board 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2.5rem}.pf-sections__grid{gap:1rem}}@keyframes nb-fade{0%{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}@keyframes nb-pulse-border{0%,to{border-color:#8b5cf64d}50%{border-color:#8b5cf699}}.nb-page{background:var(--bg-primary,#0a0e1a);min-height:100vh;color:var(--text-primary,#f0f2f8);flex-direction:column;font-family:Inter,system-ui,-apple-system,sans-serif;display:flex}.nb-header{text-align:center;padding:48px 24px 32px;animation:.5s both nb-fade}.nb-header__title{letter-spacing:-.02em;background:linear-gradient(135deg, var(--accent-blue,#60a5fa), var(--accent-purple,#a78bfa));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin:0 0 8px;font-size:2rem;font-weight:700}.nb-header__desc{color:var(--text-secondary,#94a3b8);margin:0;max-width:520px;margin-inline:auto;font-size:.95rem;line-height:1.6}.nb-grid{grid-template-columns:1fr;gap:16px;width:100%;max-width:800px;margin:0 auto;padding:0 24px 64px;animation:.55s .1s both nb-fade;display:grid}.nb-batch-card{background:var(--bg-card,#1a1f35);cursor:pointer;-webkit-backdrop-filter:blur(12px);border:1px solid #ffffff0f;border-radius:14px;padding:24px 28px;transition:transform .22s,box-shadow .22s,border-color .22s;position:relative;overflow:hidden}.nb-batch-card:before{content:"";border-radius:inherit;pointer-events:none;background:linear-gradient(135deg,#ffffff05,#0000);position:absolute;inset:0}.nb-batch-card:hover{border-color:#ffffff1a;transform:translateY(-3px);box-shadow:0 12px 40px #0006,0 0 0 1px #ffffff14}.nb-batch-card:active{transform:translateY(-1px)}.nb-batch-card--active{border-left:3px solid var(--accent-green,#34d399)}.nb-batch-card--completed{opacity:.6;border-left:3px solid 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