:root {
  --ink: #16181d;
  --muted: #565b66;
  --line: #e2e5ea;
  --accent: #1a3d7c;
  --accent-ink: #ffffff;
  --bg: #ffffff;
  --panel: #f7f8fa;
  --max: 640px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px 72px;
}

.block { padding: 34px 0; border-bottom: 1px solid var(--line); }
.block:last-child { border-bottom: 0; }

/* 1. hero */
.hero { padding-top: 64px; border-bottom: 0; }
h1 {
  font-size: 34px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
  font-weight: 700;
}
.sub {
  font-size: 20px;
  color: var(--muted);
  margin: 0;
  line-height: 1.45;
}

/* 2. pain */
.pain p { margin: 0 0 16px; }
.pain p:last-child { margin-bottom: 0; }

/* 3. steps */
.steps ol { margin: 0; padding-left: 22px; }
.steps li { margin: 0 0 10px; }
.free-note {
  margin: 20px 0 0;
  font-weight: 600;
  color: var(--accent);
}

/* 4. pricing */
.tiers { display: flex; gap: 14px; flex-wrap: wrap; }
.tier {
  flex: 1 1 200px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
  background: var(--panel);
}
.tier-name { font-weight: 600; color: var(--muted); font-size: 15px; text-transform: uppercase; letter-spacing: 0.04em; }
.tier-price { font-size: 28px; font-weight: 700; margin: 6px 0 2px; }
.tier-detail { color: var(--muted); }
.privacy {
  margin: 22px 0 0;
  padding: 16px 18px;
  background: #eef3fb;
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  font-weight: 500;
}

/* 5. signup */
.cta-note { margin: 0 0 16px; color: var(--muted); }
#email-form { display: flex; flex-wrap: wrap; gap: 10px; }
#email {
  flex: 1 1 260px;
  padding: 13px 14px;
  font-size: 16px;
  border: 1px solid #c7ccd4;
  border-radius: 8px;
  color: var(--ink);
}
#email:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
#submit-btn {
  padding: 13px 22px;
  font-size: 16px;
  font-weight: 600;
  color: var(--accent-ink);
  background: var(--accent);
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}
#submit-btn:hover { background: #16336a; }
#submit-btn:disabled { opacity: 0.6; cursor: default; }
.form-msg { flex-basis: 100%; margin: 4px 0 0; color: #b42318; min-height: 1em; font-size: 15px; }
.thanks p { margin: 0; font-weight: 600; }

/* 6. about */
.about { color: var(--muted); border-bottom: 0; }
.about p { margin: 0; }

a { color: var(--accent); }

@media (max-width: 480px) {
  h1 { font-size: 28px; }
  .sub { font-size: 18px; }
  main { padding-bottom: 48px; }
}