:root {
  --bg: #f6f7f9; --panel: #ffffff; --line: #e3e5ea; --text: #1d2026; --muted: #646b78;
  --accent: #c62835; --accent-ink: #ffffff; --ok: #2e8b4a; --warn: #a86d07; --err: #c92f2f; --soft: #fbe9ea;
  --radius: 14px; --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #121316; --panel: #1b1d22; --line: #2c2f36; --text: #e8e9ec; --muted: #9ba1ac;
    --accent: #ff7a80; --accent-ink: #1b0b0c; --ok: #5ccf7d; --warn: #f2b84b; --err: #ff6b6b; --soft: #3a2224; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 16px; }
header.top { border-bottom: 1px solid var(--line); background: var(--panel); }
header.top .wrap { display: flex; align-items: center; gap: 16px; min-height: 58px; flex-wrap: wrap; }
header.top .brand { font-weight: 700; text-decoration: none; color: var(--text); font-size: 18px; }
header.top nav { display: flex; gap: 14px; flex-wrap: wrap; margin-left: auto; font-size: 15px; }
header.top nav a { color: var(--muted); text-decoration: none; }
header.top nav a:hover { color: var(--text); }
main { padding: 28px 0 48px; }
h1 { font-size: clamp(26px, 5vw, 38px); line-height: 1.15; margin: 0 0 12px; }
h2 { font-size: 22px; margin: 36px 0 12px; }
h3 { font-size: 17px; margin: 0 0 6px; }
p { margin: 0 0 12px; }
.lead { font-size: 18px; color: var(--muted); max-width: 680px; }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.card.accent { border-color: var(--accent); }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.price { font-size: 30px; font-weight: 700; margin: 6px 0; }
.price span { font-size: 15px; font-weight: 400; color: var(--muted); }
ul.ticks { list-style: none; padding: 0; margin: 10px 0 14px; }
ul.ticks li { padding-left: 24px; position: relative; margin: 5px 0; }
ul.ticks li::before { content: "✓"; position: absolute; left: 2px; color: var(--ok); font-weight: 700; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink);
  padding: 11px 18px; border-radius: 10px; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; min-height: 44px; }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.small { padding: 6px 12px; min-height: 34px; font-size: 14px; }
.btn:disabled { opacity: .55; cursor: default; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
label.field { display: grid; gap: 5px; margin: 10px 0; font-size: 15px; }
input[type=email], input[type=text], select, textarea { font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--text); width: 100%; }
input.key { font-family: var(--mono); letter-spacing: .5px; text-transform: uppercase; }
label.check { display: flex; gap: 10px; align-items: flex-start; margin: 10px 0; font-size: 15px; }
label.check input { margin-top: 4px; width: 18px; height: 18px; flex: none; }
.notice { border-radius: 10px; padding: 12px 14px; margin: 12px 0; background: var(--soft); }
.notice.ok { background: color-mix(in srgb, var(--ok) 14%, transparent); }
.notice.err { background: color-mix(in srgb, var(--err) 14%, transparent); }
.keybox { font: 600 clamp(17px, 4.5vw, 24px)/1.3 var(--mono); letter-spacing: 1px; padding: 14px; border: 2px dashed var(--accent); border-radius: 12px; text-align: center; word-break: break-all; user-select: all; }
.steps { counter-reset: s; list-style: none; padding: 0; }
.steps li { counter-increment: s; padding-left: 40px; position: relative; margin: 12px 0; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 28px; height: 28px; border-radius: 50%; background: var(--accent); color: var(--accent-ink);
  display: grid; place-items: center; font-weight: 700; font-size: 14px; }
table.list { width: 100%; border-collapse: collapse; font-size: 15px; }
table.list td, table.list th { padding: 8px 6px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
footer { border-top: 1px solid var(--line); padding: 20px 0 32px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; gap: 16px; flex-wrap: wrap; }
dialog { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); color: var(--text); padding: 20px; width: min(460px, calc(100vw - 32px)); }
dialog::backdrop { background: rgba(0, 0, 0, .45); }
.hidden { display: none !important; }
.prose { max-width: 760px; }
.prose h2 { font-size: 19px; }
.placeholder { background: color-mix(in srgb, var(--warn) 22%, transparent); padding: 0 4px; border-radius: 4px; }