:root { color-scheme: light; }
* { box-sizing: border-box; }
body { margin: 0; background: #E8EEF6; color: #1c2430; font: 17px/1.55 -apple-system, system-ui, "Segoe UI", sans-serif; }
header { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 16px; padding: 14px 16px; background: #fff; border-bottom: 1px solid #cfd8e6; }
header nav a { margin-right: 12px; font-size: 15px; }
.brand { font-weight: 700; font-size: 20px; text-decoration: none; color: #1c2430; }
main { max-width: 720px; margin: 0 auto; padding: 16px; }
h1 { font-size: 28px; line-height: 1.2; }
h2 { margin-top: 2em; border-bottom: 1px solid #cfd8e6; padding-bottom: 4px; }
a { color: #1b5fb8; overflow-wrap: anywhere; }
blockquote { margin: 1em 0; padding: 0 14px; border-left: 4px solid #9fb3d0; color: #3c4a60; }
code { background: #fff; padding: 1px 4px; border-radius: 4px; }
.notice { background: #fff; border: 1px solid #cfd8e6; border-radius: 8px; padding: 10px 14px; }
.notice.error { border-color: #b3261e; color: #b3261e; }
#sent { display: none; }
#sent:target { display: block; }
form label { display: block; margin: 12px 0; font-size: 15px; }
input, textarea { display: block; width: 100%; margin-top: 4px; padding: 10px; font: inherit; border: 1px solid #9fb3d0; border-radius: 8px; background: #fff; }
button { padding: 12px 22px; font: inherit; font-weight: 600; color: #fff; background: #1b5fb8; border: 0; border-radius: 8px; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }