:root {
  --brand: #0c787b;            /* text colour: ≥ 4.5:1 on white, --bg and the pale teal tint */
  --on-brand: #ffffff;          /* text on brand-coloured buttons */
  --brand-deep: #085466;
  --bg: #f7f9f9;
  --card: #ffffff;
  --ink: #142124;
  --muted: #55676b;
  --line: #dfe7e8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand: #3bb8ba;
    --on-brand: #06292b;          /* light teal buttons in dark mode get dark text */
    --brand-deep: #8fd8d9;
    --bg: #0e1517;
    --card: #162023;
    --ink: #e8f0f1;
    --muted: #9bb0b3;
    --line: #26353a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

header { padding: 20px 0; }
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; font-size: 19px; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 15px; }
nav a:hover, nav a[aria-current] { color: var(--ink); }

.hero { padding: 48px 0 32px; text-align: center; }
.hero img { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 10px 30px rgba(8, 84, 102, .18); }
.hero h1 { font-size: clamp(32px, 6vw, 46px); line-height: 1.15; margin: 24px 0 12px; letter-spacing: -.02em; }
.hero p { color: var(--muted); font-size: 19px; max-width: 560px; margin: 0 auto; }
.badge { display: inline-block; margin-top: 24px; padding: 10px 18px; border-radius: 999px; background: var(--brand); color: #fff; font-weight: 600; font-size: 15px; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; padding: 24px 0 48px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 20px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.5; }
.card svg { width: 26px; height: 26px; color: var(--brand); margin-bottom: 10px; }

.doc { padding: 16px 0 48px; }
.doc h1 { font-size: 34px; line-height: 1.2; margin: 16px 0 4px; letter-spacing: -.01em; }
.doc .meta { color: var(--muted); font-size: 15px; margin-bottom: 28px; }
.doc h2 { font-size: 21px; margin: 34px 0 8px; }
.doc ul { padding-left: 22px; }
.doc li { margin: 6px 0; }
.note { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--brand); border-radius: 10px; padding: 14px 16px; margin: 20px 0; }
table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 12px 0; }
th, td { text-align: left; vertical-align: top; padding: 10px 8px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; }
.table-scroll { overflow-x: auto; }

footer { border-top: 1px solid var(--line); padding: 24px 0 40px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; }
footer a { color: var(--muted); }

/* keyboard focus: one visible ring on every interactive element */
:focus-visible { outline: 3px solid var(--brand); outline-offset: 3px; border-radius: 6px; }
a:focus:not(:focus-visible), button:focus:not(:focus-visible) { outline: none; }
/* everything clickable shows the hand cursor */
a, button, summary, label[for], select, input[type="checkbox"], input[type="radio"], [role="button"] { cursor: pointer; }

/* skip link for keyboard users: hidden until focused */
.skip { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--card); color: var(--brand); padding: 10px 14px; border-radius: 10px; font-weight: 600; box-shadow: 0 4px 16px rgba(0, 0, 0, .15); }
.skip:focus { left: 12px; }
/* faster taps on phones (no double-tap-zoom wait) */
a, button, input, select, textarea, summary { touch-action: manipulation; }