:root { color-scheme:light dark; --bg:#f3f5f7; --card:#fff; --ink:#17191c; --muted:#68727e; --line:#dfe4e9; --accent:#16845b; }
* { box-sizing:border-box; }
body { margin:0; background:var(--bg); color:var(--ink); font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif; }
main { width:min(760px,calc(100% - 32px)); margin:40px auto; padding:40px; border:1px solid var(--line); border-radius:18px; background:var(--card); box-shadow:0 18px 55px rgba(25,35,48,.08); }
.brand { display:flex; align-items:center; gap:12px; margin-bottom:32px; }
.mark { display:grid; width:44px; height:44px; place-items:center; border-radius:13px; background:var(--ink); color:var(--card); font-size:22px; font-weight:800; }
h1 { margin:0; font-size:28px; letter-spacing:-.03em; } h2 { margin:2em 0 .5em; font-size:20px; } h3 { margin:1.5em 0 .3em; font-size:16px; }
p,li { color:var(--muted); } strong { color:var(--ink); } a { color:var(--accent); text-underline-offset:3px; }
.promise { margin:24px 0; padding:18px 20px; border-left:4px solid var(--accent); border-radius:0 12px 12px 0; background:color-mix(in srgb,var(--accent) 8%,var(--card)); }
.promise p { margin:0; } .promise p + p { margin-top:8px; }
nav { display:flex; gap:16px; margin-left:auto; font-size:14px; }
footer { margin-top:36px; padding-top:18px; border-top:1px solid var(--line); color:var(--muted); font-size:13px; }
@media (max-width:600px) { main { margin:0; width:100%; padding:24px; border:0; border-radius:0; box-shadow:none; } nav { display:none; } }
@media (prefers-color-scheme:dark) { :root { --bg:#17191c; --card:#202328; --ink:#f2f4f6; --muted:#a0a8b2; --line:#363b43; --accent:#55c99a; } main { box-shadow:none; } }