:root {
  --bg: #eef3f7;
  --surface: #ffffff;
  --text: #1b2838;
  --muted: #5b6b7c;
  --accent: #0b6e99;
  --accent-soft: #d7eef7;
  --border: #d5e0ea;
  --shadow: 0 12px 40px rgba(27, 40, 56, 0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(11, 110, 153, 0.08), transparent 35%),
    linear-gradient(180deg, #f7fafc 0%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

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

a:hover {
  text-decoration: underline;
}

.layout {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  color: var(--text);
}

.brand:hover {
  text-decoration: none;
}

.brand-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, #0b6e99, #7ec8e3);
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.92rem;
}

.nav-links a.active,
.nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

main {
  flex: 1;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
}

.hero {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 2.5rem;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-bottom: 0.75rem;
}

.hero p {
  color: var(--muted);
  max-width: 640px;
}

.badge {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem;
}

.card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

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

.content-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.75rem;
  margin-bottom: 1rem;
}

.content-block h2 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.content-block p,
.content-block li {
  color: var(--muted);
}

.content-block ul {
  margin: 0.75rem 0 0 1.1rem;
}

footer {
  text-align: center;
  padding: 1.25rem;
  color: var(--muted);
  font-size: 0.82rem;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

@media (max-width: 640px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero {
    padding: 1.75rem;
  }
}