:root {
  --bg: #ffffff;
  --bg-alt: #f5f6f8;
  --text: #1f2328;
  --muted: #5b6470;
  --accent: #2f6fed;
  --border: #e3e6ea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --bg-alt: #181c21;
    --text: #e8eaed;
    --muted: #9aa3ad;
    --accent: #6b9bff;
    --border: #2a3038;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

a {
  color: var(--accent);
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  position: sticky;
  top: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-block: 1rem;
}

.logo {
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

nav a {
  margin-left: 1.25rem;
  color: var(--muted);
  text-decoration: none;
}

nav a:first-child {
  margin-left: 0;
}

nav a:hover {
  color: var(--text);
}

.hero {
  padding-block: 6rem 5rem;
}

.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(2rem, 6vw, 3.25rem);
  line-height: 1.15;
}

.tagline {
  margin: 0 0 2rem;
  font-size: 1.15rem;
  color: var(--muted);
}

.button {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
}

.section {
  padding-block: 4rem;
}

.section.alt {
  background: var(--bg-alt);
}

.section h2 {
  margin-top: 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.card {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}

.card h3 {
  margin-top: 0;
}

.card p {
  margin-bottom: 0;
  color: var(--muted);
}

.site-footer {
  padding-block: 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}