:root {
  --bg: #ffffff;
  --text: #0b0c0c;
  --muted: #4c4f56;
  --accent: #002D72;   /* QUT blue */
  --accent-ink: #ffffff;
  --brand-green: #007a3d; 
  --focus: #0b5fff;
  --tile: #f8f8f8;
  --tile-border: #e0e0e0;
  --tile-hover: #f1f7f4;
  --maxw: 78rem;
}

* { box-sizing: border-box; }
html:focus-within { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html:focus-within { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, 'Noto Sans', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 1rem; }
.visually-hidden { position: absolute !important; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

/* Skip link */
.skip-link { position:absolute; left:-9999px; top:auto; width:1px; height:1px; overflow:hidden; }
.skip-link:focus { position: static; width: auto; height: auto; padding: .5rem .75rem; background: var(--accent); color: #fff; }

/* Header */
.site-header { border-bottom: 6px solid var(--accent); background: var(--accent); position: sticky; top: 0; z-index: 10; }
.header-inner { display: grid; grid-template-columns: 1fr auto auto; gap: 1rem; align-items: center; }
.brand { display: inline-flex; align-items: center; gap: .5rem; font-weight: 800; font-size: 1.25rem; text-decoration: none; color: #fff; }
.brand-mark { display:inline-block; width:.75rem; height:1.25rem; background: var(--accent); border-radius: 2px; }
.brand-text { letter-spacing: .5px; color:#fff; }

.nav-toggle { display: none; border: 1px solid var(--tile-border); background: #fff; padding: .5rem .75rem; border-radius: .5rem; }
.site-nav ul { list-style: none; display: flex; gap: 1rem; margin: 0; padding: 0; }
.site-nav a { color: #fff; text-decoration: underline; text-underline-offset: .2em; }
.site-nav a.is-active { color: var(--accent-ink); text-decoration-thickness: .2em; }

@media (max-width: 800px) {
  .header-inner { grid-template-columns: 1fr auto; }
  .site-nav { display: none; }
  .site-nav.open, .site-nav[aria-expanded="true"] { display: block; }
  .nav-toggle { display: inline-block; }
  #nav-menu { display: grid; gap: .5rem; padding-top: .5rem; }
}

/* Hero */
.hero { display: grid; grid-template-columns: 1.5fr 1fr; gap: 2rem; align-items: center; padding-block: 2rem; }
.hero-content h1 { font-size: clamp(2rem, 4vw + 1rem, 3.25rem); margin: 0 0 .25rem 0; }
.lede { font-size: 1.2rem; font-weight: 600; margin: 0 0 .25rem 0; }
.sublede { color: var(--muted); margin: 0 0 1rem 0; max-width: 65ch; }
.cta-row { display: flex; gap: .75rem; flex-wrap: wrap; }
.hero-aside { display:flex; justify-content:flex-end; }
.hero-badge { align-self: start; background: var(--tile); border: 2px solid var(--tile-border); padding: .75rem 1rem; border-radius: .75rem; font-weight: 700; }

@media (max-width: 900px) { .hero { grid-template-columns: 1fr; } .hero-aside { justify-content: start; } }

/* Buttons */
.button { display:inline-block; background: var(--accent); color: var(--accent-ink); padding: .75rem 1rem; border-radius: .5rem; text-decoration:none; font-weight:600; }
.button:hover, .button:focus { outline: 3px solid var(--focus); outline-offset: 2px; }
.button-secondary { background: var(--brand-green); }

/* Tiles */
.tiles h2 { margin-top: 0; }
.tile-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.tile-link { display: grid; grid-template-rows: auto auto 1fr; gap: .25rem; background: var(--tile); border: 1.5px solid var(--tile-border); border-radius: .75rem; padding: 1rem; height: 100%; text-decoration: none; color: inherit; }
.tile-link:focus, .tile-link:hover { border-color: var(--accent); background: var(--tile-hover); outline: 3px solid var(--focus); outline-offset: 2px; }
.tile-icon { font-size: 1.5rem; }
.tile-title { font-weight: 700; font-size: 1.1rem; }
.tile-desc { color: var(--muted); }

/* Split section */
.split { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; align-items: start; margin-top: 1rem; }
.info-panel { background: #fff; border: 1px solid var(--tile-border); border-radius: .75rem; padding: 1rem; }
.link-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .5rem; }
.link-list a { text-decoration: underline; text-underline-offset: .2em; }

@media (max-width: 900px) { .split { grid-template-columns: 1fr; } }

/* Footer */
.site-footer { border-top: 1px solid #ddd; margin-top: 2rem; font-size: .9375rem; }

/* High-contrast mode support */
@media (prefers-contrast: more) {
  .tile-link { border-width: 2px; }
}