:root{--bg:#0b0f1a;--bg-soft:#111827;--card:#151d2e;--card-hover:#1a2440;--border:#24304a;--text:#e8edf7;--text-dim:#93a1bd;--accent:#4f9dff;--accent-2:#7cffc4;--warn:#ffb454;--radius:14px;--max:1080px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}.container{max-width:var(--max);margin:0 auto;padding:0 20px}a{color:var(--accent);text-decoration:none}.site-header{border-bottom:1px solid var(--border);position:-webkit-sticky;position:sticky;top:0;background:rgba(11,15,26,.85);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);z-index:50}.header-inner{display:flex;align-items:center;justify-content:space-between;height:60px}.logo{font-size:1.25rem;font-weight:800;letter-spacing:-.02em;color:var(--text)}.logo span{color:var(--accent)}.nav{display:flex;gap:22px}.nav a{color:var(--text-dim);font-size:.95rem;font-weight:500;min-height:44px;display:inline-flex;align-items:center}.nav a:hover{color:var(--text)}.hero{padding:64px 0 40px;text-align:center}.hero h1{font-size:clamp(2rem,5vw,3.3rem);font-weight:800;letter-spacing:-.03em;line-height:1.12;max-width:820px;margin:0 auto 18px}.hero h1 em{font-style:normal;color:var(--accent)}.hero p.lede{color:var(--text-dim);font-size:1.15rem;max-width:640px;margin:0 auto 28px}.hero-ctas{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;min-height:46px;padding:0 22px;border-radius:999px;font-weight:600;font-size:.98rem}.btn-primary{background:var(--accent);color:#06101f}.btn-primary:hover{filter:brightness(1.1)}.btn-ghost{border:1px solid var(--border);color:var(--text)}.btn-ghost:hover{border-color:var(--accent)}.sim-wrap{margin:44px auto 0;max-width:900px;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#070b14}.sim-canvas{display:block;width:100%;height:340px;cursor:crosshair}.sim-caption{padding:10px 16px;font-size:.85rem;color:var(--text-dim);border-top:1px solid var(--border);display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}.section{padding:56px 0}.section h2{font-size:1.7rem;font-weight:750;letter-spacing:-.02em;margin-bottom:8px}.section .sub{color:var(--text-dim);margin-bottom:28px;max-width:640px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));grid-gap:14px;gap:14px}.card{display:block;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;transition:border-color .15s,background .15s}.card:hover{background:var(--card-hover);border-color:var(--accent)}.card h3{font-size:1.02rem;font-weight:650;color:var(--text);margin-bottom:6px}.card p{font-size:.88rem;color:var(--text-dim)}.card .formula-chip{display:inline-block;margin-top:10px;font-family:SF Mono,ui-monospace,Menlo,monospace;font-size:.8rem;color:var(--accent-2);background:rgba(124,255,196,.07);padding:3px 9px;border-radius:6px}.pillars{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));grid-gap:14px;gap:14px}.pillar{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px}.pillar h3{font-size:1.05rem;margin-bottom:8px}.pillar p{color:var(--text-dim);font-size:.92rem}.calc-layout{padding:40px 0 64px}.breadcrumbs{font-size:.85rem;color:var(--text-dim);margin-bottom:18px}.calc-layout h1{font-size:clamp(1.6rem,4vw,2.3rem);font-weight:800;letter-spacing:-.02em;margin-bottom:10px}.calc-desc{color:var(--text-dim);max-width:700px;margin-bottom:28px}.calc-box{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:26px;max-width:700px;margin-bottom:40px}.calc-formula{font-family:SF Mono,ui-monospace,Menlo,monospace;color:var(--accent-2);font-size:1.05rem;margin-bottom:20px}.calc-inputs{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));grid-gap:14px;gap:14px;margin-bottom:22px}.calc-inputs label{display:block;font-size:.85rem;color:var(--text-dim);margin-bottom:5px}.calc-inputs input{width:100%;background:var(--bg-soft);border:1px solid var(--border);border-radius:10px;color:var(--text);font-size:1.05rem;padding:11px 12px;min-height:44px}.calc-inputs input:focus{outline:none;border-color:var(--accent)}.unit{color:var(--text-dim);font-size:.8rem}.calc-results{border-top:1px solid var(--border);padding-top:18px;display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));grid-gap:14px;gap:14px}.result{background:rgba(79,157,255,.06);border:1px solid rgba(79,157,255,.25);border-radius:10px;padding:14px}.result .r-label{font-size:.82rem;color:var(--text-dim)}.result .r-value{font-size:1.45rem;font-weight:750;color:var(--accent);word-break:break-word}.result .r-unit{font-size:.85rem;color:var(--text-dim);margin-left:4px}.prose{max-width:700px}.prose h2{font-size:1.35rem;font-weight:700;margin:34px 0 12px;letter-spacing:-.01em}.prose h3{font-size:1.08rem;font-weight:650;margin:22px 0 8px}.prose p{color:var(--text-dim);margin-bottom:14px}.prose strong{color:var(--text)}.faq-item{border:1px solid var(--border);border-radius:10px;padding:16px 18px;margin-bottom:10px;background:var(--card)}.faq-item h3{font-size:.98rem;margin:0 0 6px;color:var(--text)}.faq-item p{font-size:.92rem;margin:0}.related{margin-top:40px}.related h2{font-size:1.2rem;margin-bottom:14px}.chip-row{display:flex;flex-wrap:wrap;gap:10px}.chip{border:1px solid var(--border);border-radius:999px;padding:8px 16px;font-size:.88rem;color:var(--text);background:var(--card);min-height:40px;display:inline-flex;align-items:center}.chip:hover{border-color:var(--accent)}.cat-label{display:inline-block;font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--accent-2);margin-bottom:10px;font-weight:600}.guide-hero{padding:48px 0 8px}.guide-hero h1{font-size:clamp(1.7rem,4vw,2.5rem);font-weight:800;letter-spacing:-.02em;max-width:760px;margin-bottom:12px}.site-footer{border-top:1px solid var(--border);margin-top:40px;padding:40px 0 0;background:var(--bg-soft)}.footer-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:30px;padding-bottom:30px}.footer-logo{font-size:1.1rem}.footer-tag{color:var(--text-dim);font-size:.88rem;margin-top:8px;max-width:280px}.footer-cols{display:flex;gap:60px}.footer-cols h4{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-dim);margin-bottom:10px}.footer-cols a{display:block;color:var(--text);font-size:.9rem;padding:4px 0}.footer-cols a:hover{color:var(--accent)}.footer-legal{border-top:1px solid var(--border);padding-top:16px;padding-bottom:24px;font-size:.8rem;color:var(--text-dim)}@media (max-width:640px){.hero{padding:44px 0 28px}.sim-canvas{height:260px}.footer-cols{gap:30px}}