/* Sero Tools — single stylesheet.
   System fonts only. One muted-blue accent. No gradients, shadows, motion. */

:root {
  --ink:    #1a1a1a;
  --muted:  #555555;
  --faint:  #8a8a8a;
  --border: #e5e5e5;
  --accent: #3a5a7c;
  --bg:     #ffffff;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
               Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 28px;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
a:hover { text-decoration-thickness: 2px; }

/* ── Header ── */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 22px 0;
}
.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.brand {
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.005em;
}
.brand:hover { text-decoration: none; color: var(--ink); }
.nav { display: flex; gap: 28px; }
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
}
.nav a:hover { color: var(--accent); }

/* ── Sections / typography ── */
section { padding: 72px 0; }
section.hero { padding-top: 88px; padding-bottom: 64px; }
section + section { border-top: 1px solid var(--border); }

h1 {
  margin: 0 0 24px;
  font-size: 36px;
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}
h2 {
  margin: 0 0 22px;
  font-size: 22px;
  line-height: 1.3;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.005em;
}
p { margin: 0 0 18px; }
p:last-child { margin-bottom: 0; }

/* ── Hero ── */
.hero h1 { max-width: 640px; }
.hero .lede {
  font-size: 19px;
  line-height: 1.55;
  color: var(--muted);
  max-width: 620px;
  margin-bottom: 28px;
}
.hero .trust {
  font-size: 14px;
  color: var(--faint);
  margin-bottom: 36px;
}
.hero .micro,
.final-cta .micro {
  font-size: 14px;
  color: var(--faint);
  margin-top: 16px;
  margin-bottom: 0;
}

/* ── CTA button ── */
.cta {
  display: inline-block;
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
  padding: 12px 22px;
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.3;
}
.cta:hover {
  background: var(--accent);
  color: #ffffff;
  text-decoration: none;
}

/* ── Lists ── */
.steps, .bullets {
  margin: 0;
  padding-left: 22px;
}
.steps  { list-style: decimal; }
.bullets { list-style: disc; }
.steps li, .bullets li {
  margin-bottom: 10px;
  padding-left: 4px;
}
.steps li::marker, .bullets li::marker { color: var(--faint); }

/* ── Offer / Data / About ── */
.offer p     { margin-bottom: 10px; }
.data .bullets li { color: var(--ink); }
.about p     { color: var(--ink); }

/* ── Final CTA ── */
.final-cta { padding-bottom: 80px; }

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}
.site-footer .container {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  font-size: 14px;
}
.site-footer a {
  color: var(--muted);
  text-decoration: none;
}
.site-footer a:hover { color: var(--accent); text-decoration: underline; }

/* ── Long-form pages (privacy, terms) ── */
.longform h1 { margin-bottom: 12px; }
.longform .lead {
  font-size: 15px;
  color: var(--faint);
  margin-bottom: 40px;
}
.longform h2 { margin-top: 40px; }
.longform h2:first-of-type { margin-top: 0; }
.longform p { margin-bottom: 14px; }
.longform ul { padding-left: 22px; margin: 0 0 14px; }
.longform li { margin-bottom: 6px; }
.longform-end {
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--faint);
}

/* ── Mobile ── */
@media (max-width: 600px) {
  body { font-size: 16px; }
  .container { padding: 0 22px; }
  section { padding: 56px 0; }
  section.hero { padding-top: 64px; padding-bottom: 48px; }
  h1 { font-size: 28px; }
  h2 { font-size: 20px; }
  .hero .lede { font-size: 17px; }
  .cta {
    display: block;
    text-align: center;
    padding: 14px 22px;
  }
  .nav { gap: 18px; }
  .site-footer .container { gap: 18px; }
}