:root{--bg: #0a0a0a;--bg-soft: #101010;--card: #151515;--card-hover: #1a1a1a;--text: #c9c9c9;--heading: #ffffff;--muted: #8c8c8c;--faint: #6e6e6e;--border: #232323;--border-hi: #2e2e2e;--accent: #0c8ce9;--accent-hi: #3fa4ee;--radius: 14px;--wrap: 1080px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.65;margin:0;-webkit-font-smoothing:antialiased}img{max-width:100%;height:auto;display:block}a{color:var(--accent-hi)}.wrap{max-width:var(--wrap);margin:0 auto;padding:0 1.5rem}h1,h2,h3{color:var(--heading);line-height:1.2}.topbar{position:sticky;top:0;z-index:50;background:var(--bg);transition:transform .28s ease}.topbar.is-hidden{transform:translateY(-100%)}.topbar.is-pinned{border-bottom:1px solid var(--border)}nav{display:flex;align-items:center;justify-content:space-between;padding:1.1rem 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var(--border);border-radius:var(--radius);padding:1.4rem;transition:background .15s ease,border-color .15s ease}.card:hover{background:var(--card-hover);border-color:var(--border-hi)}.card h3{margin:0 0 .5rem;font-size:1.05rem}.card p{margin:0;font-size:.95rem;color:var(--text)}.steps{counter-reset:step;display:grid;gap:.9rem;max-width:720px;margin:0 auto}.step{display:flex;gap:1rem;align-items:flex-start;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1.1rem 1.3rem}.step .n{counter-increment:step;flex:none;width:28px;height:28px;border-radius:50%;background:var(--accent);color:#fff;font-weight:700;font-size:.9rem;display:grid;place-items:center}.step .n:before{content:counter(step)}.step p{margin:.15rem 0 0}.step b{color:var(--heading)}.step kbd{background:var(--bg);border:1px solid var(--border-hi);border-bottom-width:2px;border-radius:6px;padding:.05rem .4rem;font-size:.9em;color:var(--heading)}.term{max-width:720px;margin:0 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thead th.vecto{color:var(--accent-hi);background:#0c8ce924}.dl-grid{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.dl{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1.3rem;text-align:center}.dl h3{margin:0 0 .2rem;font-size:1rem}.dl .os{color:var(--muted);font-size:.85rem;margin:0 0 .9rem}.dl .sub-dl{color:var(--muted);font-size:.85rem;margin:.8rem 0 0}.dl-store{position:relative;border-color:var(--accent);background:var(--card-hover)}.dl-badge{position:absolute;top:-.6rem;left:50%;transform:translate(-50%);background:var(--accent);color:#fff;font-size:.7rem;font-weight:700;letter-spacing:.03em;text-transform:uppercase;white-space:nowrap;padding:.15rem .6rem;border-radius:999px}.note{margin-top:1.4rem;padding:.9rem 1.1rem;border-radius:10px;background:var(--bg-soft);border:1px solid var(--border);color:var(--muted);font-size:.88rem}.note b{color:var(--text)}.faq{max-width:760px;margin:0 auto}details{border-bottom:1px solid var(--border);padding:1rem 0}details summary{cursor:pointer;font-weight:600;color:var(--heading);list-style:none;display:flex;justify-content:space-between;gap:1rem;align-items:center}details summary::-webkit-details-marker{display:none}details summary:after{content:"+";color:var(--accent-hi);font-weight:700}details[open] summary:after{content:"–"}details p{margin:.7rem 0 0;color:var(--text)}footer{border-top:1px solid var(--border);padding:2.2rem 0 3rem;color:var(--muted);font-size:.88rem}footer .row{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}footer a{color:var(--muted)}footer a:hover{color:var(--heading)}@media (max-width: 640px){nav .links a:not(.btn){display:none}.hero{padding-top:2rem}}@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}.btn,.topbar{transition:none}}