* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; min-height: 100vh; background: var(--scene), var(--bg); background-attachment: fixed;
  color: var(--text); font: 400 16px/1.55 var(--ui); }
a { color: var(--primary); text-underline-offset: 3px; }
.wrap { width: min(640px, 100% - 32px); margin-inline: auto; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 0; }
.brand { font-family: var(--brand, var(--ui)); display: inline-flex; align-items: center; gap: 10px; color: var(--text);
  text-decoration: none; font-weight: 600; font-size: 19px; letter-spacing: -.01em; }
.brand svg { width: 32px; height: 32px; flex: none; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 20px;
  border-radius: 999px; font: 500 15px/1 var(--ui); text-decoration: none; cursor: pointer;
  border: 1px solid var(--border); color: var(--text); background: var(--glass); }
.btn:hover { background: var(--hover); }
.btn.primary { background: var(--primary); border-color: transparent; color: var(--on-primary); }
.btn:disabled { opacity: .6; cursor: progress; }
a:focus-visible, .btn:focus-visible, input:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 24px; padding: 28px; margin: 8px 0 48px; box-shadow: var(--pop); }
h1 { font-size: 32px; line-height: 1.1; letter-spacing: -.02em; font-weight: 600; margin: 0 0 10px; }
.lede { color: var(--text-2); margin: 0 0 24px; }
.plans { border: 0; padding: 0; margin: 0 0 20px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.plans legend { font-weight: 600; margin-bottom: 8px; padding: 0; }
.plan { position: relative; display: grid; gap: 4px; padding: 16px; border: 1px solid var(--border); border-radius: 16px; cursor: pointer; background: var(--glass); }
.plan:has(input:checked) { border-color: var(--primary); box-shadow: 0 0 0 1px var(--primary) inset; }
.plan input { position: absolute; top: 16px; right: 16px; accent-color: var(--primary); }
.plan-name { font-weight: 600; font-size: 17px; }
.plan-price { color: var(--text-2); font-size: 14px; }
.plan-price b { color: var(--text); font-size: 20px; }
.plan-what { color: var(--text-2); font-size: 13px; line-height: 1.4; }
.field { display: grid; gap: 6px; margin: 0 0 14px; }
.field span { font-weight: 500; font-size: 14px; }
.field small { color: var(--text-2); font-size: 13px; }
.field input { min-height: 44px; padding: 0 14px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font: 400 16px var(--ui); width: 100%; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.error { color: var(--danger, #e5484d); margin: 4px 0 14px; }
.fine { color: var(--text-2); font-size: 13px; margin: 16px 0 0; }
#go { width: 100%; }
@media (max-width: 560px) {
  .plans, .pair { grid-template-columns: 1fr; }
  .card { padding: 20px; }
}