:root {
  --ink: #1A1918; --muted: #5f5d58; --paper: #F7F6F3; --card: #ffffff;
  --navy: #08113A; --blue: #8FB8E6; --line: #e6e3dc;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #F2F1EE; --muted: #b4b2ad; --paper: #121212; --card: #1c1c1e; --line: #2c2c2e; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  padding: 0 16px;
}
header, main, footer { max-width: 720px; margin: 0 auto; }
header { padding: 28px 0 8px; display: flex; align-items: center; gap: 12px; }
header a { color: var(--ink); text-decoration: none; font-weight: 700; font-size: 20px; }
main { background: var(--card); border-radius: 16px; padding: 24px 22px 32px; box-shadow: 0 5px 18px rgba(0,0,0,.06); }
h1 { font-size: 28px; line-height: 1.2; margin: 0 0 4px; }
h2 { font-size: 19px; margin: 28px 0 6px; }
h3 { font-size: 16px; margin: 18px 0 4px; }
p, li { color: var(--ink); }
.muted { color: var(--muted); font-size: 14px; }
a { color: inherit; }
ul { padding-left: 20px; }
footer { padding: 20px 0 36px; display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 14px; }
footer a { color: var(--muted); }
.button { display: inline-block; background: var(--blue); color: var(--navy); font-weight: 700;
  padding: 12px 20px; border-radius: 14px; text-decoration: none; margin-top: 12px; }

/* Share-link preview pages (functions/src/share/previewModel.ts):
   the card is `main`; the cover sits flush at its top, 3:2, and the
   empty placeholder keeps the neutral page the same shape. */
main.preview { padding-top: 0; overflow: hidden; }
.preview-cover { display: block; width: calc(100% + 44px); margin: 0 -22px 20px; aspect-ratio: 3 / 2;
  object-fit: cover; background: var(--line); }
.preview-cover-empty { background: linear-gradient(135deg, var(--navy), var(--blue)); }
.preview-kind { margin: 0 0 2px; font-size: 13px; letter-spacing: .04em; text-transform: uppercase; }
.preview h1 { overflow-wrap: anywhere; }