:root {
  --bg: #0e1116;
  --panel: #161b22;
  --panel-2: #1c232d;
  --line: #2a323d;
  --ink: #e8edf2;
  --ink-dim: #9aa7b4;
  --accent: #3fb950;
  --accent-ink: #04170a;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header.top { padding: 22px 0; border-bottom: 1px solid var(--line); }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; }
.logo { font-weight: 700; letter-spacing: -0.02em; font-size: 18px; }
.hero { padding: 64px 0 40px; text-align: center; }
.hero h1 { font-size: clamp(30px, 6vw, 46px); line-height: 1.1; letter-spacing: -0.03em; margin: 0 0 14px; }
.hero .tagline { font-size: clamp(17px, 3vw, 20px); color: var(--ink-dim); margin: 0 auto 28px; max-width: 30em; }
.price { font-size: 20px; color: var(--ink-dim); margin: 0 0 18px; }
.price b { color: var(--ink); font-size: 30px; }
.btn {
  display: inline-block; background: var(--accent); color: var(--accent-ink);
  font-weight: 700; font-size: 17px; padding: 14px 32px; border-radius: 10px;
  border: none; cursor: pointer; box-shadow: var(--shadow);
}
.btn:hover { filter: brightness(1.06); text-decoration: none; }
.btn[disabled], .btn.disabled { background: var(--panel-2); color: var(--ink-dim); cursor: not-allowed; box-shadow: none; }
.btn-sub { display: block; margin-top: 10px; font-size: 13px; color: var(--ink-dim); }
.shot { margin: 36px auto 0; max-width: 100%; border-radius: 12px; border: 1px solid var(--line); box-shadow: var(--shadow); }
section { padding: 40px 0; border-top: 1px solid var(--line); }
section h2 { font-size: 22px; letter-spacing: -0.02em; margin: 0 0 18px; }
ul.features { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
ul.features li { position: relative; padding-left: 30px; color: var(--ink); }
ul.features li::before { content: ""; position: absolute; left: 4px; top: 9px; width: 8px; height: 8px; background: var(--accent); border-radius: 50%; }
.faq details { border: 1px solid var(--line); border-radius: 10px; padding: 4px 16px; margin-bottom: 10px; background: var(--panel); }
.faq summary { cursor: pointer; font-weight: 600; padding: 12px 0; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq details[open] summary { border-bottom: 1px solid var(--line); }
.faq p { color: var(--ink-dim); margin: 12px 0; }
.guarantee { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 20px 22px; color: var(--ink-dim); text-align: center; }
footer { padding: 40px 0 64px; color: var(--ink-dim); font-size: 14px; text-align: center; border-top: 1px solid var(--line); }
/* success + cancel pages */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 28px; box-shadow: var(--shadow); }
.center { text-align: center; padding-top: 64px; }
.keybox { background: var(--bg); border: 1px dashed var(--line); border-radius: 10px; padding: 14px 16px; font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 18px; letter-spacing: 0.04em; user-select: all; }
.muted { color: var(--ink-dim); }
.spinner { width: 26px; height: 26px; border: 3px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; margin: 0 auto; }
@keyframes spin { to { transform: rotate(360deg); } }
.err { color: #f0883e; }