/* One stylesheet for all four pages. Palette matches the App Store
   screenshots: pale sky page, navy ink, one orange accent. */
:root {
  --sky-0: #ffffff;
  --sky-1: #eaf3fb;
  --sky-2: #cfe6fa;
  --ink: #0c2233;
  --ink-soft: #4a6274;
  --accent: #f2542d;
  --rule: #d9e6f1;
  --card: #ffffff;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 17px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, var(--sky-0) 0%, var(--sky-1) 55%, var(--sky-2) 100%);
  background-attachment: fixed;
}
header { padding: 56px 20px 8px; text-align: center; }
.mark { display: block; margin: 0 auto 14px; }
h1 { margin: 0 0 6px; font-size: 34px; line-height: 1.15; letter-spacing: -0.6px; }
h1 .hl { color: var(--accent); }
.tag { margin: 0; color: var(--ink-soft); font-size: 15px; }
nav { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin: 26px 0 0; }
nav a {
  padding: 9px 18px; border-radius: 999px; background: var(--card);
  color: var(--ink); text-decoration: none; font-weight: 600; font-size: 15px;
  border: 2px solid transparent; box-shadow: 0 1px 2px rgba(12, 34, 51, 0.06);
}
nav a:hover { border-color: var(--rule); }
nav a[aria-current="page"] { border-color: var(--accent); }
main { max-width: 700px; margin: 0 auto; padding: 10px 20px 72px; }
section {
  background: var(--card); border-radius: 18px; padding: 24px 26px; margin: 18px 0;
  box-shadow: 0 1px 3px rgba(12, 34, 51, 0.06);
}
section h2 { margin: 0 0 10px; font-size: 20px; letter-spacing: -0.2px; }
section p:last-child, section ul:last-child { margin-bottom: 0; }
ul { padding-left: 22px; }
li { margin: 6px 0; }
a { color: var(--accent); }
.lede { font-size: 19px; }
.grid { display: grid; gap: 14px; grid-template-columns: 1fr; }
@media (min-width: 620px) { .grid { grid-template-columns: 1fr 1fr; } }
.grid section { margin: 0; }
dl { margin: 0; }
dt { font-weight: 700; margin-top: 14px; }
dt:first-child { margin-top: 0; }
dd { margin: 4px 0 0; color: var(--ink-soft); }
.mail { font-weight: 700; font-size: 18px; }
footer { text-align: center; color: var(--ink-soft); font-size: 14px; padding: 8px 20px 48px; }
footer a { color: var(--ink-soft); }
@media (max-width: 480px) {
  header { padding-top: 40px; }
  h1 { font-size: 28px; }
  section { padding: 20px; }
}