/* Base typography and layout */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Merriweather", Georgia, serif;
  --text: #111;
  --muted: #555;
  --bg: #fff;
  --accent: #0061ff;
  --maxw: 1024px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { font-family: var(--font-sans); color: var(--text); background: var(--bg); line-height: 1.65; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 1rem; }

h1, h2, h3 { line-height: 1.25; margin: 1.6rem 0 0.8rem; font-weight: 700; }
h1 { font-size: clamp(1.8rem, 2.5vw + 1rem, 2.6rem); }
h2 { font-size: clamp(1.4rem, 1.8vw + 0.8rem, 2rem); }
h3 { font-size: clamp(1.2rem, 1.2vw + 0.8rem, 1.4rem); }
p, li { font-size: 1.05rem; color: var(--text); }
.muted { color: var(--muted); }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header and nav */
.site-header { border-bottom: 1px solid #eee; background: #fafafa; }
.site-header .nav { display: flex; align-items: center; justify-content: space-between; padding: 0.75rem 0; }
.brand { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 800; color: inherit; }
.brand .logo { height: 36px; width: auto; }

nav { position: relative; }
nav .menu { list-style: none; margin: 0; padding: 0; display: flex; gap: 0.8rem; }
nav .menu a { padding: 0.4rem 0.6rem; border-radius: 6px; }
nav .menu a:hover { background: #eef4ff; text-decoration: none; }
nav .hamburger { display: none; cursor: pointer; font-size: 1.6rem; padding: 0.2rem 0.5rem; }
nav input#nav-toggle { display: none; }

/* Responsive nav */
@media (max-width: 860px) {
  nav .hamburger { display: inline-block; }
  nav .menu { position: absolute; right: 0; top: 100%; background: #fff; border: 1px solid #eee; border-radius: 8px; padding: 0.6rem; display: none; flex-direction: column; min-width: 240px; }
  nav input#nav-toggle:checked ~ .menu { display: flex; }
}

/* Footer */
.site-footer { border-top: 1px solid #eee; margin-top: 3rem; padding: 1.5rem 0; font-size: 0.95rem; color: var(--muted); }
.site-footer a { color: inherit; text-decoration: underline; }

/* Utilities */
.grid { display: grid; gap: 1.2rem; }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 860px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
}

.card { border: 1px solid #eee; border-radius: 10px; padding: 1rem; background: #fff; }
.chip { display: inline-block; padding: 0.2rem 0.5rem; border-radius: 999px; background: #eef4ff; color: #124eda; font-size: 0.85rem; }

.lead { font-size: 1.2rem; }