/* Clean, calm styles. System fonts only, no images, no scripts. */
:root {
  --text: #16202e;
  --muted: #4a5668;
  --bg: #ffffff;
  --tint: #eef6f8;          /* card / hero background */
  --line: #d5e0e6;
  --blue: #0a2f63;          /* main color: headings, primary button */
  --link: #0a6070;          /* dark teal: text and links */
  --accent: #2cc5b8;        /* bright teal: backgrounds and highlights only */
  --btn-bg: #0a2f63;
  --btn-text: #ffffff;
  --focus: #0a6070;         /* dark teal outline: strong contrast on white */
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e8eef6;
    --muted: #aebbcc;
    --bg: #0a1628;
    --tint: #10233d;
    --line: #25405f;
    --blue: #a9ccff;
    --link: #5fd9d0;
    --btn-bg: #2cc5b8;
    --btn-text: #06182e;
    --focus: #2cc5b8;       /* bright teal outline: strong contrast on dark blue */
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.7;
}

.wrap { max-width: 60rem; margin: 0 auto; padding: 1rem; }
main .wrap > h1, main .wrap > p, main .wrap > h2, main .wrap > ul,
main .wrap > ol, main .wrap > blockquote { max-width: 42rem; } /* readable article lines */

a { color: var(--link); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

h1, h2, h3 { color: var(--blue); line-height: 1.25; }
h1 { font-size: 1.9rem; }
h2 { font-size: 1.45rem; margin-top: 2.5rem; }
h3 { font-size: 1.1rem; margin: 0 0 0.4rem; }

/* Header */
header.site { border-top: 4px solid var(--accent); border-bottom: 1px solid var(--line); }
header.site .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 0.5rem 1rem; }
header.site a { text-decoration: none; }
.brand { display: block; font-weight: 700; font-size: 1.35rem; color: var(--blue); }
.project-by { display: block; color: var(--muted); font-size: 0.9rem; line-height: 1.3; }
header.site nav { display: flex; gap: 0.25rem; }
header.site nav a { padding: 0.4rem 0.75rem; border-radius: 0.5rem; color: var(--text); font-weight: 600; transition: background 0.15s; }
header.site nav a:hover { background: var(--tint); }
header.site nav a[aria-current="page"] { color: var(--link); box-shadow: inset 0 -3px 0 var(--accent); border-radius: 0; }

.byline { color: var(--muted); font-size: 0.95rem; margin-top: -0.5rem; }
.byline + .byline { margin-top: -0.75rem; }   /* dates sit close under the byline */

/* Hero */
.hero { background: var(--tint); border-bottom: 1px solid var(--line); }
.hero .wrap { padding: 3rem 1rem; }
.hero h1 { font-size: 2.4rem; margin: 0 0 0.5rem; }
.lead { font-size: 1.3rem; color: var(--text); margin: 0 0 1.5rem; max-width: 36rem; }
.buttons { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 0; }
.btn { display: inline-block; padding: 0.7rem 1.25rem; border-radius: 0.5rem; font-weight: 600; text-decoration: none; border: 2px solid var(--btn-bg); transition: transform 0.15s, background 0.15s; }
.btn:hover { transform: translateY(-2px); }
.btn.primary { background: var(--btn-bg); color: var(--btn-text); }
.btn.secondary { background: transparent; color: var(--blue); border-color: var(--blue); }
.btn.secondary:hover { background: var(--bg); }

/* Cards */
.grid { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 38rem) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 56rem) { .grid.four { grid-template-columns: repeat(4, 1fr); } }
.card { background: var(--tint); border: 1px solid var(--line); border-top: 4px solid var(--accent); border-radius: 0.6rem; padding: 1rem 1.1rem; transition: transform 0.15s, box-shadow 0.15s; }
.card:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(10, 47, 99, 0.12); }
.card h3 a { text-decoration: none; }
.card p { margin: 0 0 0.5rem; color: var(--muted); font-size: 0.98rem; line-height: 1.55; }
.card .more { font-weight: 600; }

/* FAQ */
.faq details { border: 1px solid var(--line); border-radius: 0.6rem; padding: 0.75rem 1rem; margin-bottom: 0.6rem; background: var(--tint); }
.faq summary { cursor: pointer; font-weight: 600; color: var(--blue); }
.faq details p { margin: 0.6rem 0 0; }

/* Footer */
footer.site { border-top: 1px solid var(--line); margin-top: 3rem; color: var(--muted); font-size: 0.95rem; }
footer.site nav { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; margin-bottom: 0.5rem; }
footer.site p { margin: 0; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  .btn:hover, .card:hover { transform: none; }
}