*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#f8f8fa;--card:#fff;--ink:#09090b;--ink-2:#52525b;--ink-3:#71717a;--line:#e4e4e7;--blue:#0071e3;--purple:#af52de;--blue-soft:#e8f2fd;--radius:20px;
--shadow:0 4px 24px rgba(0,0,0,.06),0 1px 3px rgba(0,0,0,.04);
--font:-apple-system,BlinkMacSystemFont,'SF Pro Text','Inter','Segoe UI',system-ui,sans-serif}
[data-theme="dark"]{--bg:#0a0a0f;--card:#131318;--ink:#fafafa;--ink-2:#a1a1aa;--ink-3:#8b8b94;--line:#27272a;--blue-soft:rgba(0,113,227,.14);--shadow:0 4px 24px rgba(0,0,0,.5)}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--ink);line-height:1.65;min-height:100vh;display:flex;flex-direction:column;-webkit-font-smoothing:antialiased;
background-color:var(--bg);
background-image:radial-gradient(ellipse 800px 600px at 15% 10%,rgba(0,113,227,.08),transparent 60%),radial-gradient(ellipse 700px 500px at 85% 90%,rgba(175,82,222,.07),transparent 60%);
background-attachment:fixed;transition:background-color .4s,color .4s}
a{color:var(--blue)}
.nav{position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding:12px 24px;background:color-mix(in srgb,var(--bg) 80%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;letter-spacing:-.01em}
.mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,#0071e3,#af52de);color:#fff;display:grid;place-items:center;font-weight:800}
.links{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto}
.links a{color:var(--ink-2);text-decoration:none;font-size:14px;font-weight:600;padding:6px 14px;border-radius:100px}
.links a:hover{color:var(--blue);background:var(--blue-soft)}
.links a[aria-current="page"]{color:var(--blue);background:var(--blue-soft)}
.theme{border:1px solid var(--line);background:var(--card);color:var(--ink);width:36px;height:36px;border-radius:50%;cursor:pointer;font-size:16px}
main{flex:1;width:100%;max-width:820px;margin:0 auto;padding:56px 24px 72px}
.eyebrow{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);background:var(--blue-soft);padding:5px 12px;border-radius:100px;margin-bottom:16px}
h1{font-size:clamp(32px,5vw,46px);line-height:1.15;letter-spacing:-.03em;margin-bottom:12px}
.lead{font-size:18px;color:var(--ink-2);margin-bottom:8px}
.updated{font-size:14px;color:var(--ink-3);margin-bottom:36px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px;margin-bottom:20px}
h2{font-size:22px;letter-spacing:-.02em;margin:34px 0 10px}
.card h2:first-child,main>h2:first-of-type{margin-top:0}
h3{font-size:17px;margin:20px 0 6px}
p,li{color:var(--ink-2);font-size:16px}
p{margin-bottom:12px}
ul{padding-left:22px;margin-bottom:12px}
li{margin-bottom:6px}
strong{color:var(--ink)}
.toc{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:28px}
.toc a{font-size:13px;font-weight:600;text-decoration:none;color:var(--ink-2);border:1px solid var(--line);background:var(--card);padding:6px 12px;border-radius:100px}
.toc a:hover{color:var(--blue);border-color:var(--blue)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:20px 0}
.tile{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px}
.tile h3{margin:0 0 6px}.tile p{margin:0;font-size:15px}
.note{border-left:4px solid var(--blue);background:var(--blue-soft);padding:14px 18px;border-radius:0 12px 12px 0;margin:16px 0;color:var(--ink-2)}
label{display:block;font-size:14px;font-weight:600;margin:16px 0 6px;color:var(--ink)}
input,select,textarea{width:100%;font:inherit;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:12px 14px}
input:focus,select:focus,textarea:focus{outline:2px solid var(--blue);outline-offset:1px}
textarea{min-height:150px;resize:vertical}
.btn{display:inline-block;margin-top:20px;border:0;cursor:pointer;font:inherit;font-weight:700;color:#fff;background:linear-gradient(135deg,#0071e3,#af52de);padding:13px 26px;border-radius:100px;text-decoration:none}
.btn:hover{filter:brightness(1.08)}
.small{font-size:13px;color:var(--ink-3);margin-top:10px}
footer{border-top:1px solid var(--line);padding:28px 24px;text-align:center;font-size:14px;color:var(--ink-3)}
footer nav{display:flex;gap:6px 18px;justify-content:center;flex-wrap:wrap;margin-bottom:10px}
footer a{color:var(--ink-2);text-decoration:none;font-weight:600}
footer a:hover{color:var(--blue)}
@media(max-width:600px){.nav{padding:10px 16px}.links{margin-left:0;order:3;width:100%}main{padding:36px 16px 56px}.card{padding:22px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}html{scroll-behavior:auto}}