:root {
    --bg: #ffffff; --bg2: #f5f5f7; --fg: #1d1d1f; --muted: #6e6e73;
    --line: #d2d2d7; --accent: #4c1d95; --accent-press: #3b0f7a;
    --ok: #1a8f3c; --bad: #c8102e; --radius: 14px;
}
@media (prefers-color-scheme: dark) {
    :root { --bg: #0b0b0d; --bg2: #1c1c1e; --fg: #f5f5f7; --muted: #98989d; --line: #38383a; --accent: #a78bfa; --accent-press: #8b5cf6; }
}
* { box-sizing: border-box; }
body {
    margin: 0; background: var(--bg); color: var(--fg);
    font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 980px; margin: 0 auto; padding: 0 24px; }
h1 { font-size: clamp(38px, 7vw, 68px); line-height: 1.05; letter-spacing: -0.02em; margin: 0 0 16px; }
h2 { font-size: clamp(26px, 4vw, 38px); letter-spacing: -0.01em; margin: 0 0 14px; }
p.lead { font-size: 21px; color: var(--muted); margin: 0 0 28px; }
.btn {
    display: inline-block; background: var(--accent); color: #fff; border: 0;
    border-radius: 980px; padding: 14px 28px; font-size: 17px; font-weight: 500;
    cursor: pointer; text-decoration: none;
}
.btn:hover { background: var(--accent-press); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn.secondary { background: transparent; color: var(--accent); border: 1px solid var(--line); }
.card { background: var(--bg2); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
header.nav { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; border-bottom: 1px solid var(--line); }
header.nav a.brand { color: var(--fg); text-decoration: none; font-weight: 600; letter-spacing: -0.01em; }
footer { border-top: 1px solid var(--line); margin-top: 80px; padding: 32px 0; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); }
section { padding: 72px 0; }
input[type="email"] { padding: 12px 16px; border-radius: 980px; border: 1px solid var(--line); background: var(--bg); color: var(--fg); font-size: 16px; min-width: 240px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
/* p.lead is 0-1-1 specificity; a bare .price-tag (0-1-0) would always lose
   to it regardless of source order, since both set font-size and color.
   Qualifying the selector the same way beats it on specificity, not luck. */
p.lead.price-tag { font-size: 32px; color: var(--fg); margin: 8px 0; }
.note-muted { font-size: 14px; color: var(--muted); }
.notify-form { display: flex; gap: 8px; flex-wrap: wrap; }