:root {
  color-scheme: dark;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  background: #0d0f12;
  color: #f2f4f5;
}

* { box-sizing: border-box; }

body { margin: 0; background: #0d0f12; }

main { width: min(100% - 40px, 720px); margin: 0 auto; padding: 48px 0 72px; }

header { margin-bottom: 42px; }

.brand { color: #39d16a; font-size: 15px; font-weight: 750; letter-spacing: 0; text-decoration: none; }

h1 { margin: 14px 0 8px; font-size: 30px; line-height: 1.25; }
h2 { margin: 34px 0 10px; font-size: 18px; }
p, li { color: rgba(242, 244, 245, .7); font-size: 16px; line-height: 1.85; }

.lead { font-size: 17px; }
.card { padding: 22px; border: 1px solid rgba(255,255,255,.09); border-radius: 8px; background: #202326; }
.card p:last-child { margin-bottom: 0; }

a { color: #39d16a; }
nav { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 26px; }
footer { margin-top: 48px; color: rgba(242,244,245,.48); font-size: 13px; }

form { display: grid; gap: 8px; }
label { margin-top: 8px; color: rgba(242,244,245,.86); font-size: 14px; font-weight: 650; }
input, textarea { width: 100%; border: 1px solid rgba(255,255,255,.14); border-radius: 6px; background: #121416; color: #f2f4f5; font: inherit; padding: 12px; }
textarea { resize: vertical; }
button { margin-top: 10px; min-height: 46px; border: 0; border-radius: 6px; background: #39d16a; color: #07140b; cursor: pointer; font: inherit; font-weight: 750; }
button:disabled { cursor: wait; opacity: .68; }
#form-status { min-height: 1.85em; margin: 4px 0 0; }

@media (max-width: 560px) {
  main { width: min(100% - 32px, 720px); padding-top: 36px; }
  h1 { font-size: 26px; }
}