/* DomainTend — family design language: deep-blue hero, frosted glass, clean sans.
   Static, no build step. Shared by both pages. */

:root {
  --deep-blue: #0b2a5b;
  --deep-blue-2: #123a75;
  --ink: #1c2733;
  --muted: #5a6a7a;
  --line: #dbe4ee;
  --bg: #f6f9fc;
  --card: #ffffff;
  --accent: #2e7cf6;
  --good: #1d8a56;
  --warn: #b97a0f;
  --radius: 14px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 880px; margin: 0 auto; padding: 0 22px; }

/* ---------- header / hero ---------- */
.hero {
  background: linear-gradient(160deg, var(--deep-blue) 0%, var(--deep-blue-2) 100%);
  color: #fff;
  padding: 30px 0 54px;
}
.nav {
  display: flex; justify-content: space-between; align-items: center;
  padding-bottom: 38px;
}
.brand { font-weight: 700; font-size: 20px; letter-spacing: .2px; color: #fff; }
.brand span { color: #9ec2ff; }
.nav a { color: #cfe1ff; font-size: 15px; margin-left: 22px; }
.nav a:hover { color: #fff; }
.hero h1 {
  font-size: 40px; line-height: 1.2; margin: 0 0 16px; font-weight: 750;
  max-width: 640px;
}
.hero p.lede { font-size: 19px; color: #d7e6ff; max-width: 620px; margin: 0 0 26px; }
.hero .glass {
  background: rgba(255, 255, 255, .09);
  border: 1px solid rgba(255, 255, 255, .22);
  backdrop-filter: blur(8px);
  border-radius: var(--radius);
  padding: 16px 20px;
  max-width: 620px;
  color: #eaf2ff;
  font-size: 15.5px;
}

/* ---------- sections ---------- */
main { padding: 44px 0 10px; }
h2 { font-size: 25px; margin: 38px 0 12px; line-height: 1.3; }
h2:first-child { margin-top: 0; }
h3 { font-size: 19px; margin: 26px 0 8px; }
p { margin: 0 0 14px; }
.muted { color: var(--muted); }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 18px 0 6px; }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px;
}
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { font-size: 15px; color: var(--muted); margin: 0; }
.card .tag {
  display: inline-block; font-size: 12.5px; font-weight: 700; letter-spacing: .4px;
  padding: 2px 9px; border-radius: 999px; margin-bottom: 10px;
}
.tag.spf { background: #e3edff; color: var(--deep-blue-2); }
.tag.dkim { background: #e2f4ec; color: var(--good); }
.tag.dmarc { background: #fdf0da; color: var(--warn); }

.steps { counter-reset: step; padding: 0; list-style: none; margin: 16px 0; }
.steps li {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 18px 16px 58px; margin-bottom: 12px; position: relative;
}
.steps li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 16px; top: 16px;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--deep-blue); color: #fff; font-weight: 700; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
}
.steps li p { margin: 0; font-size: 15.5px; }
.steps li p + p { margin-top: 8px; }

code, .record {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14.5px;
}
.record {
  display: block; background: #0e1f38; color: #cfe6ff;
  border-radius: 10px; padding: 12px 16px; margin: 10px 0 14px;
  overflow-x: auto; white-space: nowrap;
}
p code, li code { background: #e8eef6; border-radius: 5px; padding: 1px 6px; }

.note {
  border-left: 4px solid var(--accent); background: #eef4fd;
  border-radius: 0 10px 10px 0; padding: 12px 16px; margin: 16px 0;
  font-size: 15.5px;
}
.note p { margin: 0; }

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--line); margin-top: 48px;
  padding: 26px 0 40px; color: var(--muted); font-size: 14.5px;
}
footer p { margin: 0 0 6px; }

@media (max-width: 720px) {
  .cards { grid-template-columns: 1fr; }
  .hero h1 { font-size: 31px; }
  body { font-size: 16px; }
}