:root{--bg:#f6f7fb;--surface:#fff;--ink:#0f172a;--muted:#64748b;--brand:#6366f1;--brand-2:#22d3ee;--line:#e2e8f0;--ok:#16a34a;--bad:#dc2626;--radius:14px}@media (prefers-color-scheme:dark){:root{--bg:#0b1120;--surface:#111a2e;--ink:#f1f5f9;--muted:#94a3b8;--line:#1e2b45}}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--ink);min-height:100vh;line-height:1.8}.wrap{max-width:1080px;margin:0 auto;padding:0 20px}nav{justify-content:space-between;align-items:center;padding:20px 0;display:flex}.logo{align-items:center;gap:10px;font-size:18px;font-weight:700;display:flex}.logo span{background:linear-gradient(135deg, var(--brand), var(--brand-2));color:#fff;border-radius:10px;place-items:center;width:36px;height:36px;display:grid}.btn{border-radius:var(--radius);align-items:center;gap:8px;padding:12px 22px;font-size:15px;font-weight:500;text-decoration:none;transition:transform .15s,box-shadow .15s;display:inline-flex}.btn:hover{transform:translateY(-2px)}.btn-primary{background:var(--brand);color:#fff;box-shadow:0 8px 24px -8px var(--brand)}.btn-ghost{border:1px solid var(--line);color:var(--ink);background:var(--surface)}.hero{text-align:center;padding:56px 0 48px}.badge{background:color-mix(in srgb, var(--brand) 14%, transparent);color:var(--brand);border-radius:999px;margin-bottom:18px;padding:6px 14px;font-size:13px;display:inline-block}.hero h1{margin-bottom:14px;font-size:clamp(26px,5vw,42px);font-weight:700;line-height:1.5}.hero p{color:var(--muted);max-width:520px;margin:0 auto 28px;font-size:16px}.cta{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.demo{background:var(--surface);border:1px solid var(--line);border-radius:20px;max-width:620px;margin:0 auto 56px;padding:24px;box-shadow:0 20px 50px -25px #0f172a40}.demo-label{color:var(--muted);margin-bottom:6px;font-size:13px}.demo-q{margin-bottom:16px;font-size:18px;font-weight:500}.opts{gap:10px;display:grid}.opt{text-align:right;cursor:pointer;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;border-radius:12px;padding:12px 16px;font-size:15px;transition:border-color .2s,background .2s}.opt:hover{border-color:var(--brand)}.opt.ok{background:color-mix(in srgb, var(--ok) 15%, transparent);border-color:var(--ok);color:var(--ok)}.opt.bad{background:color-mix(in srgb, var(--bad) 15%, transparent);border-color:var(--bad);color:var(--bad)}.feedback{color:var(--muted);min-height:24px;margin-top:12px;font-size:14px}.features{grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin-bottom:56px;display:grid}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px}.card .icon{background:color-mix(in srgb, var(--brand) 14%, transparent);width:44px;height:44px;color:var(--brand);border-radius:12px;place-items:center;margin-bottom:14px;font-size:20px;display:grid}.card h3{margin-bottom:6px;font-size:17px;font-weight:600}.card p{color:var(--muted);font-size:14px}.stats{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:56px;display:grid}.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);text-align:center;padding:18px}.stat strong{font-size:24px;font-weight:700;display:block}.stat small{color:var(--muted);font-size:13px}.cta-box{text-align:center;background:linear-gradient(135deg, var(--brand), var(--brand-2));color:#fff;border-radius:24px;margin-bottom:40px;padding:40px 24px}.cta-box h2{margin-bottom:8px;font-size:24px}.cta-box p{opacity:.9;margin-bottom:22px}.cta-box .btn-primary{color:var(--brand);box-shadow:none;background:#fff}footer{text-align:center;color:var(--muted);padding:24px 0 36px;font-size:13px}@media (width<=600px){.hero{padding:36px 0 32px}.demo{padding:18px}.nav-link{display:none}}