:root {
  --color-bg: #fafafa;
  --color-text: #212121;
  --color-accent: #1a3a5c;
  --color-surface: #e8edf2;
  --color-muted: #59636e;
  --color-border: #cbd4dd;
  --color-on-accent: #ffffff;
  --color-error: #b3261e;
  --color-surface-raised: #ffffff;
  --shadow-card: 0 0.3rem 1.2rem rgba(26, 58, 92, 0.1);
  --font-heading: 'Merriweather', serif;
  --font-body: 'Source Sans 3', sans-serif;
  --font-size-base: 1.0625rem;
  --spacing-section: 5rem;
  --border-radius: 4px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--color-bg); color: var(--color-text); font-family: var(--font-body); font-size: var(--font-size-base); line-height: 1.7; }
h1, h2, h3 { font-family: var(--font-heading); line-height: 1.3; margin-bottom: 1.25rem; }
h1 { font-size: 2rem; font-weight: 700; }
h2 { font-size: 1.4rem; font-weight: 700; }
p { margin-bottom: 1.25rem; }
a { color: var(--color-accent); }

.site-header { background: var(--color-accent); padding: 1rem 2rem; }
.site-nav { display: flex; align-items: center; gap: 2rem; max-width: 64rem; margin: 0 auto; }
.site-name { font-weight: 700; font-size: 1.1rem; text-decoration: none; color: #ffffff; font-family: var(--font-heading); }
.nav-links { display: flex; list-style: none; gap: 1.5rem; }
.nav-links a { text-decoration: none; color: rgba(255,255,255,0.85); font-size: 0.95rem; }
.nav-links a:hover { color: #ffffff; }
.theme-selector { display: flex; align-items: center; gap: 0.5rem; margin-left: auto; color: rgba(255,255,255,0.85); font-size: 0.85rem; }
.theme-selector select { padding: 0.35rem 1.75rem 0.35rem 0.5rem; color: var(--color-text); background: #ffffff; border: 1px solid rgba(255,255,255,0.5); border-radius: var(--border-radius); font: inherit; text-transform: capitalize; }
.theme-selector select:focus-visible { outline: 3px solid #ffffff; outline-offset: 2px; }

.site-main { max-width: 64rem; margin: 0 auto; padding: var(--spacing-section) 2rem; }
.site-footer { text-align: center; padding: 2rem; background: var(--color-surface); color: var(--color-muted); font-size: 0.875rem; }

.site-main > .c-component + .c-component { margin-block-start: var(--spacing-section); }

@media (max-width: 48rem) {
  .site-header { padding: 1rem; }
  .site-nav { align-items: flex-start; flex-direction: column; gap: 0.75rem; }
  .nav-links { width: 100%; max-width: 100%; flex-wrap: wrap; gap: 0.5rem 1.25rem; }
  .theme-selector { margin-left: 0; }
}