:root{--bg:#ffffff;--bg2:#f5f6fb;--fg:#0f172a;--fg2:#334155;--mute:#64748b;--line:#e2e8f0;--acc:#5b5cf6;--acc2:#eef0ff}
@media (prefers-color-scheme:dark){:root{--bg:#0b0d12;--bg2:#11141b;--fg:#eef1f6;--fg2:#c7cdd8;--mute:#8a93a3;--line:#232937;--acc:#8b8cfb;--acc2:#1c1f3d}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.7 "IBM Plex Sans Thai","Noto Sans Thai","Segoe UI",system-ui,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--acc)}
.wrap{max-width:980px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line);position:sticky;top:0;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);z-index:5}
header .wrap{display:flex;align-items:center;gap:12px;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--fg);font-weight:700;font-size:18px}
.brand img{width:34px;height:34px}
nav{margin-left:auto;display:flex;gap:18px;font-size:14px}nav a{color:var(--fg2);text-decoration:none}nav a:hover{color:var(--acc)}
.hero{padding:72px 0 48px;text-align:center}
.hero img{width:96px;height:96px;filter:drop-shadow(0 12px 28px rgba(91,92,246,.35))}
.hero h1{font-size:clamp(30px,5vw,46px);line-height:1.2;margin:18px 0 10px;letter-spacing:-.02em}
.hero p{font-size:18px;color:var(--fg2);max-width:640px;margin:0 auto}
.btn{display:inline-block;margin-top:26px;background:var(--acc);color:#fff;padding:12px 22px;border-radius:12px;text-decoration:none;font-weight:600}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;padding:24px 0 56px}
.card{background:var(--bg2);border:1px solid var(--line);border-radius:16px;padding:22px}
.card b{display:block;font-size:17px;margin-bottom:4px}.card span{color:var(--fg2);font-size:15px}
.steps{counter-reset:s;padding:0 0 56px}
.steps h2,.doc h2{font-size:24px;letter-spacing:-.01em}
.step{display:flex;gap:14px;align-items:flex-start;margin:14px 0}
.step:before{counter-increment:s;content:counter(s);flex:none;width:30px;height:30px;border-radius:50%;background:var(--acc2);color:var(--acc);display:grid;place-items:center;font-weight:700}
.doc{padding:40px 0 64px;max-width:760px}
.doc h1{font-size:32px;margin-bottom:4px}.doc .upd{color:var(--mute);font-size:14px;margin-top:0}
.doc h2{margin-top:34px}.doc h3{margin-top:22px;font-size:18px}
.doc li{margin:6px 0}
.note{background:var(--acc2);border-radius:12px;padding:14px 16px;font-size:15px}
footer{border-top:1px solid var(--line);padding:28px 0;color:var(--mute);font-size:14px}
footer .wrap{display:flex;gap:18px;flex-wrap:wrap;align-items:center}footer a{color:var(--mute)}