:root {
  --bg: #0f1318;
  --panel: #111827;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --brand: #10b981;
  --line: #334155;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}
.top {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 28px; border-bottom: 1px solid var(--line); background: #0b0f14;
}
.brand { display: flex; gap: 12px; align-items: center; }
.mark {
  width: 40px; height: 40px; background: var(--brand); border-radius: 6px;
  display: grid; place-items: center; font-weight: 800; color: #fff;
}
.brand strong { display: block; }
.brand span { font-weight: 800; }
.brand small { color: var(--brand); font-weight: 700; letter-spacing: .04em; }
.ghost {
  color: var(--text); text-decoration: none; border: 1px solid var(--line);
  padding: 8px 14px; border-radius: 6px;
}
main { max-width: 1040px; margin: 0 auto; padding: 40px 20px 80px; }
.eyebrow { color: var(--brand); font-weight: 700; letter-spacing: .08em; font-size: 12px; }
h1 { font-size: clamp(2rem, 4vw, 3rem); line-height: 1.15; margin: 8px 0 16px; }
.lead { color: var(--muted); font-size: 1.1rem; max-width: 640px; }
.bullets { list-style: none; padding: 0; margin: 24px 0; }
.bullets li { margin: 8px 0; color: #cbd5e1; }
.note { color: #64748b; font-size: 13px; }
.plans { margin-top: 56px; }
.grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px; margin-top: 16px;
}
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 18px; cursor: pointer; transition: border-color .15s;
}
.card:hover, .card.selected { border-color: var(--brand); }
.card h3 { margin: 0 0 6px; }
.card .price { color: var(--brand); font-weight: 700; font-size: 1.3rem; margin: 10px 0; }
.card .meta { color: var(--muted); font-size: 13px; }
.checkout-form {
  margin-top: 48px; background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 24px; max-width: 520px;
}
label { display: block; margin: 12px 0; font-size: 14px; color: var(--muted); }
input {
  width: 100%; margin-top: 6px; padding: 10px 12px; border-radius: 6px;
  border: 1px solid var(--line); background: #0b1220; color: var(--text);
}
button {
  margin-top: 16px; width: 100%; padding: 12px 16px; border: 0; border-radius: 6px;
  background: var(--brand); color: #0f1318; font-weight: 700; cursor: pointer;
}
button:disabled { opacity: .45; cursor: not-allowed; }
.error { color: #f87171; min-height: 1.2em; }
footer { border-top: 1px solid var(--line); padding: 20px; text-align: center; color: #64748b; font-size: 12px; }
.box { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 24px; max-width: 560px; }
.success h1 { color: var(--brand); }