:root {
  color-scheme: dark;
  --bg: #071416;
  --panel: #102326;
  --panel-light: #173136;
  --text: #f4f7f6;
  --muted: #adc0bd;
  --accent: #55d6be;
  --accent-dark: #06201c;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
body { min-height: 100vh; margin: 0; background: radial-gradient(circle at 50% 0, #17434a 0, transparent 42rem), var(--bg); color: var(--text); }
main { width: min(46rem, calc(100% - 2rem)); margin: 0 auto; padding: 4rem 0 2.5rem; }
header { text-align: center; }
.mark { width: 3.25rem; height: 3.25rem; margin: 0 auto 1rem; border: 2px solid var(--accent); border-radius: 50%; color: var(--accent); font-size: 2.25rem; line-height: 2.75rem; }
.eyebrow { margin: 0 0 .45rem; color: var(--accent); font-size: .78rem; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(2.5rem, 10vw, 4.5rem); letter-spacing: -.055em; line-height: 1; }
.intro { max-width: 33rem; margin: 1rem auto 2.5rem; color: var(--muted); font-size: 1.1rem; line-height: 1.55; }
.primary { padding: 2rem; border: 1px solid #285056; border-radius: 1.25rem; background: linear-gradient(145deg, var(--panel-light), var(--panel)); box-shadow: 0 1.5rem 4rem #0006; text-align: center; }
h2 { margin: 0; font-size: 1.45rem; }
.primary > p { color: var(--muted); }
.button { display: block; margin: 1.4rem 0 1rem; padding: 1rem 1.25rem; border-radius: .75rem; background: var(--accent); color: var(--accent-dark); font-size: 1.05rem; font-weight: 800; text-decoration: none; }
.button:hover, .button:focus-visible { background: #7ce8d4; }
.note { margin: 0; font-size: .85rem; }
nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: .8rem; margin-top: .8rem; }
.card { min-height: 8rem; padding: 1.15rem; border: 1px solid #234349; border-radius: 1rem; background: var(--panel); color: var(--text); text-decoration: none; }
.card:hover, .card:focus-visible { border-color: var(--accent); }
.card span { display: block; margin-bottom: .45rem; font-weight: 750; }
.card small { color: var(--muted); line-height: 1.45; }
footer { display: flex; justify-content: center; gap: .7rem; margin-top: 2rem; color: #78918e; font-size: .88rem; }
footer a { color: var(--muted); }
@media (max-width: 38rem) { main { padding-top: 2.5rem; } .primary { padding: 1.5rem; } nav { grid-template-columns: 1fr; } .card { min-height: auto; } footer { flex-wrap: wrap; } }