:root {
  --color-bg: #f5fbff;
  --color-text: #192d3a;
  --color-accent: #1f9bb4;
  --color-accent-strong: #0b6f85;
  --color-surface: #ffffff;
  --color-muted: #637785;
  --color-border: #c7e6ee;
  --color-on-accent: #ffffff;
  --color-error: #b00020;
  --color-surface-raised: #ffffff;
  --shadow-card: 0 2px 0 #c7e6ee, 0 16px 34px rgba(25, 45, 58, 0.12);
  --font-heading: 'Baloo 2', system-ui, sans-serif;
  --font-body: 'Nunito', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-size-base: 1.0625rem;
  --spacing-section: 4.25rem;
  --border-radius: 22px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background:
    linear-gradient(180deg, rgba(199, 230, 238, 0.75), transparent 22rem),
    var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: 1.62;
}

h1, h2, h3 {
  color: #102635;
  font-family: var(--font-heading);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.04;
  margin-bottom: 1rem;
}
h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.6vw, 2.45rem); }
h3 { font-size: 1.35rem; }
p { margin-bottom: 1.15rem; }
a {
  color: var(--color-accent-strong);
  font-weight: 800;
  text-decoration: underline;
  text-decoration-thickness: 0.1em;
  text-underline-offset: 0.18em;
}
a:hover { color: #ff7a1a; }

.site-header {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 12px 28px rgba(25, 45, 58, 0.08);
  padding: 1.05rem 2rem;
}
.site-nav { display: flex; align-items: center; gap: 2rem; max-width: 72rem; margin: 0 auto; }
.site-name {
  border: 0;
  color: #102635;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  text-decoration: none;
}
.nav-links { display: flex; list-style: none; gap: 1.3rem; }
.nav-links a {
  border: 0;
  color: #192d3a;
  font-size: 0.95rem;
  padding-bottom: 0.15rem;
  text-decoration: none;
}
.nav-links a:hover { color: var(--color-accent-strong); }

.theme-selector { display: flex; align-items: center; gap: 0.5rem; margin-left: auto; color: var(--color-muted); font-size: 0.8rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.06em; }
.theme-selector select { padding: 0.35rem 1.75rem 0.35rem 0.5rem; color: var(--color-text); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--border-radius); font: inherit; }
.theme-selector select:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; }

.site-main { max-width: 72rem; margin: 0 auto; padding: var(--spacing-section) 2rem; }
.site-footer {
  background: #102635;
  color: #d6edf3;
  font-size: 0.95rem;
  padding: 2.2rem 2rem;
  text-align: center;
}
.site-footer a { color: #9ce3ef; }

.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; }
  .site-main { padding: 3rem 1rem; }
}