:root {
  color-scheme: light;
  --bg: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --card: #f8fafc;
}

* {
  box-sizing: border-box;
}

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

img {
  max-width: 100%;
  display: block;
}

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

a:hover,
a:focus {
  color: var(--accent-dark);
  text-decoration: underline;
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: #f8fafc;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}

.brand img {
  width: 52px;
  height: 52px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.95rem;
}

.nav-links a {
  color: var(--text);
  font-weight: 500;
}

.hero {
  padding: 3.5rem 0 2.5rem;
}

.hero h1 {
  font-size: clamp(2rem, 3vw, 3rem);
  margin-bottom: 0.5rem;
}

.hero p {
  font-size: 1.1rem;
  color: var(--muted);
}

.section {
  padding: 2.5rem 0;
}

.section h2 {
  font-size: 1.7rem;
  margin-bottom: 1rem;
}

.section h3 {
  margin-top: 1.5rem;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid.two {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

.card h3 {
  margin-top: 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.2rem;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
}

.button.secondary {
  background: transparent;
  color: var(--accent);
}

.button:hover,
.button:focus {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: #fff;
  text-decoration: none;
}

.list-clean {
  padding-left: 1.2rem;
}

.callout {
  border-left: 4px solid var(--accent);
  background: #eff6ff;
  padding: 1rem 1.5rem;
  border-radius: 10px;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #0f172a;
  color: #e2e8f0;
  padding: 2rem 0 3rem;
  margin-top: 3rem;
}

.site-footer a {
  color: #bae6fd;
}

.footer-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.footer-note {
  font-size: 0.9rem;
  color: #cbd5f5;
}

.meta {
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 720px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    gap: 0.75rem;
  }
}