:root { font-family: system-ui, sans-serif; color: #19324b; background: #f0f5fa; }
* { box-sizing: border-box; }
body { margin: 0; padding: 30px 16px; }
.join-card { max-width: 620px; margin: auto; padding: clamp(22px, 5vw, 44px); background: white; border-radius: 24px; box-shadow: 0 16px 60px #173a5915; }
header { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
header strong { font-size: 28px; }
header select { width: auto; }
h1 { font-size: 28px; line-height: 1.2; }
p { line-height: 1.55; }
label { display: block; margin: 14px 0; font-size: 14px; font-weight: 600; }
input, select, button { width: 100%; border: 1px solid #b8c8d6; border-radius: 9px; padding: 12px; font: inherit; margin-top: 6px; }
button { background: #1164ad; color: white; border: none; cursor: pointer; font-weight: 650; }
button:disabled { opacity: .6; cursor: wait; }
.columns { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.check { display: flex; gap: 10px; align-items: flex-start; line-height: 1.5; }
.check input { width: auto; flex: 0 0 auto; }
.offer { padding: 16px; background: #edf6ff; border-radius: 12px; white-space: pre-line; }
.offer:empty { display: none; }
a { color: #1164ad; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid #69a9e0; outline-offset: 3px; }
@media(max-width: 450px) { .columns { grid-template-columns: 1fr; gap: 0; } }