:root{
  --bg:#0f1418;--ink:#e8f4ff;--acc:#5ce1ff;--acc2:#2b8cff;
  --muted:#8eacbf;--line:#1e3340;--card:#152028;--foot:#070b0e;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.8;
background-image:radial-gradient(ellipse at 20% -10%,color-mix(in srgb,var(--acc) 22%,transparent),transparent 50%)}
a{color:inherit;text-decoration:none}
.wrap{width:min(1100px,92%);margin:0 auto}
.top{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{height:64px;display:flex;align-items:center;gap:24px}
.logo{font-weight:900;font-size:20px;letter-spacing:.04em}
.logo span{color:var(--acc)}
.nav nav{display:flex;gap:20px;margin-left:auto;font-size:14px;color:var(--muted)}
.nav nav a:hover{color:var(--acc)}
.age{font-size:11px;border:1px solid var(--acc);color:var(--acc);padding:3px 8px;border-radius:999px}
.hero{padding:78px 0 52px}
.kick{font-size:12px;letter-spacing:.22em;color:var(--acc);margin-bottom:12px}
h1{font-size:clamp(30px,5.6vw,56px);line-height:1.18;font-weight:900;letter-spacing:-.02em}
h1 em{font-style:normal;color:var(--acc)}
.lead{max-width:680px;margin:18px 0 22px;color:var(--muted);font-size:15px}
.btn{display:inline-block;background:var(--acc);color:#111;padding:10px 20px;border-radius:999px;font-weight:800;font-size:14px}
.btn.ghost{background:transparent;color:var(--acc);border:1.5px solid var(--acc)}
.sec{padding:52px 0}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:22px}
.sec-head h2{font-size:24px}
.sec-head p,.muted{color:var(--muted);font-size:13px}
.cats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px}
.cats a,.cats div{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px}
.cats b{display:block}
.cats span{font-size:12px;color:var(--muted)}
.cta{text-align:center;padding:56px 0}
.cta h2{font-size:28px}
.cta p{color:var(--muted);margin:8px 0 18px}
.foot{background:var(--foot);color:#c8c0bc;padding:36px 0;font-size:13px}
.f-logo{color:#fff;font-weight:800;margin-bottom:6px}
.links{display:flex;gap:16px;flex-wrap:wrap;margin:12px 0}
.links a:hover{color:#fff}
.copy{opacity:.6}

.tool-stage{position:relative;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;min-height:280px;overflow:hidden}
#preview{font-size:18px;line-height:1.9;max-width:720px}
#lens{position:absolute;width:160px;height:160px;border:3px solid var(--acc);border-radius:50%;pointer-events:none;box-shadow:0 0 0 9999px #0006,0 10px 30px #0008;display:none;overflow:hidden}
#lens span{position:absolute;white-space:pre-wrap;padding:18px;font-size:18px;line-height:1.9;transform-origin:0 0}
.controls{display:flex;gap:16px;flex-wrap:wrap;align-items:center;margin-top:14px}
.uses{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}
.uses div,.keys div{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px}
.keys{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px}
kbd{border:1px solid var(--line);padding:2px 7px;border-radius:6px;background:#0004}

@media(max-width:760px){.nav nav{display:none} h1{font-size:32px}}