:root { color-scheme: dark; }
* { box-sizing: border-box; }
body { margin: 0; background: #0a0a0a; color: #f4f4f4; font-family: Inter, Segoe UI, sans-serif; }
a { color: #00ff9d; text-decoration: none; }
header, main, footer { width: min(880px, calc(100% - 32px)); margin: 0 auto; }
header { display: flex; justify-content: space-between; align-items: center; padding: 28px 0; }
nav a { margin-left: 18px; }
.mark { font-family: "Space Grotesk", Inter, sans-serif; letter-spacing: .04em; }
.card { border: 1px solid #1d1d1d; border-radius: 16px; padding: 28px; background: #111; }
h1 { font-family: "Space Grotesk", Inter, sans-serif; font-weight: 500; }
.status { color: #00ff9d; }
input, button { font: inherit; }
input { width: 100%; margin: 8px 0 16px; padding: 12px; border-radius: 10px; border: 1px solid #333; background: #0a0a0a; color: #fff; }
button { background: #00ff9d; color: #0a0a0a; border: 0; border-radius: 10px; padding: 12px 18px; cursor: pointer; }
.err { color: #ff6b6b; min-height: 1.2em; }
footer { color: #8a8a8a; padding: 28px 0 48px; }