/* tryfirstbell.app: the Petrol tokens from DESIGN.md, system fonts only. */
:root {
  --bg: #F3F5F5;
  --surface: #FFFFFF;
  --ink: #15211F;
  --ink-muted: #5C6966;
  --line: #E1E7E6;
  --accent: #1D5C6B;
  --accent-tint: #E3EEF0;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0D1517;
    --surface: #162124;
    --ink: #EAF2F1;
    --ink-muted: #97A8A6;
    --line: #22302F;
    --accent: #7FC3CF;
    --accent-tint: #17313A;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
header, main, footer { max-width: 680px; margin: 0 auto; padding: 0 20px; }
header { padding-top: 24px; }
main { padding-bottom: 32px; }

h1, h2, h3, .wordmark {
  font-family: ui-serif, "New York", Georgia, "Times New Roman", serif;
  font-weight: 600;
}
.wordmark { color: var(--ink); text-decoration: none; font-size: 20px; }
h1 { font-size: 30px; line-height: 36px; letter-spacing: -0.3px; margin: 32px 0 12px; }
h2 { font-size: 22px; line-height: 28px; margin: 40px 0 8px; }
h3 { font-size: 18px; line-height: 24px; margin: 24px 0 8px; }
p, ul { margin: 0 0 16px; }
ul { padding-left: 22px; }
li { margin-bottom: 8px; }
strong { font-weight: 600; }
code { font: 0.9em ui-monospace, Menlo, monospace; }
a { color: var(--accent); text-underline-offset: 2px; overflow-wrap: anywhere; }

.meta { color: var(--ink-muted); font-size: 15px; }
.note {
  background: var(--accent-tint);
  border-radius: 14px;
  padding: 12px 16px;
  font-size: 15px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.45;
}
th, td { text-align: left; vertical-align: top; padding: 10px 12px; }
th { color: var(--ink-muted); font-weight: 600; border-bottom: 1px solid var(--line); }
tbody tr + tr td { border-top: 1px solid var(--line); }

/* On a phone, each row becomes a block of labelled lines. */
@media (max-width: 560px) {
  table, tbody, tr, td { display: block; }
  thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  tbody tr { padding: 10px 14px; }
  tbody tr + tr { border-top: 1px solid var(--line); }
  tbody tr + tr td { border-top: 0; }
  td { padding: 2px 0; }
  td::before {
    content: attr(data-label);
    display: block;
    color: var(--ink-muted);
    font-size: 13px;
  }
  td:first-child { font-weight: 600; }
  td:first-child::before { display: none; }
}

footer { border-top: 1px solid var(--line); padding-top: 16px; padding-bottom: 40px; }
footer nav { display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: 15px; }