/* ===== Reset & Base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #0077b6;
  --primary-dark: #023e8a;
  --accent: #00b4d8;
  --text: #1a1a2e;
  --light: #f8f9fa;
  --white: #ffffff;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  background: var(--white);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  z-index: 100;
}

.nav-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  text-decoration: none;
  color: var(--primary-dark);
}
.logo span { color: var(--accent); }

nav a {
  margin-left: 1.5rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  transition: color 0.2s;
}
nav a:hover { color: var(--primary); }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--primary-dark), var(--accent));
  color: var(--white);
  text-align: center;
  padding: 6rem 1.5rem;
}
.hero h1 { font-size: 2.5rem; margin-bottom: 1rem; }
.hero p { font-size: 1.2rem; opacity: 0.9; margin-bottom: 2rem; }

/* ===== Sections ===== */
.section {
  padding: 4rem 0;
  text-align: center;
}
.section.alt { background: var(--light); }
.section h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--primary-dark);
}
.section p {
  max-width: 600px;
  margin: 0 auto 1.5rem;
  font-size: 1.1rem;
}

/* ===== Cards ===== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}
.card {
  background: var(--white);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}
.card h3 { color: var(--primary); margin-bottom: 0.75rem; }

/* ===== Button ===== */
.btn {
  display: inline-block;
  padding: 0.85rem 2rem;
  background: var(--accent);
  color: var(--white);
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}
.btn:hover {
  background: var(--primary);
  transform: translateY(-2px);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--primary-dark);
  color: var(--white);
  text-align: center;
  padding: 2rem 0;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .nav-bar { flex-direction: column; gap: 0.75rem; }
  nav a { margin: 0 0.75rem; }
  .hero h1 { font-size: 1.8rem; }
}