:root{--coral:#ff6b5b;--ink:#1c1a1f;--muted:#6b6670;--bg:#fbf8f5;--card:#ffffff;--line:#ebe6e1}
@media (prefers-color-scheme:dark){:root{--ink:#f5f2ef;--muted:#a9a3ad;--bg:#141216;--card:#1f1c22;--line:#2d2932}}
*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.5 -apple-system,BlinkMacSystemFont,"SF Pro Text",Inter,system-ui,sans-serif;-webkit-font-smoothing:antialiased}
main{max-width:520px;margin:0 auto;padding:48px 20px 64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.01em}.brand .dot{width:14px;height:14px;border-radius:50%;background:var(--coral)}
h1{font-size:30px;line-height:1.15;letter-spacing:-.02em;margin:28px 0 8px}p{margin:0 0 16px;color:var(--muted)}
.card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:22px;margin:24px 0}
.code{font:600 44px/1 "SF Mono",ui-monospace,Menlo,monospace;letter-spacing:.18em;text-align:center;padding:18px 0 8px;word-break:break-all}
.code.long{font-size:22px;letter-spacing:.08em}
.btn{display:block;width:100%;text-align:center;padding:15px 18px;border-radius:14px;font-weight:600;text-decoration:none;border:1px solid var(--line);color:var(--ink);background:var(--card);margin-top:10px;cursor:pointer;font-size:17px}
.btn.primary{background:var(--coral);border-color:var(--coral);color:#fff}.btn:active{transform:scale(.99)}
.small{font-size:14px}.hidden{display:none}footer{margin-top:40px;font-size:13px;color:var(--muted)}footer a{color:inherit}

h2{font-size:19px;letter-spacing:-.01em;margin:28px 0 8px}ul{margin:0 0 16px;padding-left:20px;color:var(--muted)}li{margin:0 0 8px}li strong,p strong{color:var(--ink)}