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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.6;
  color: #111827;
  background: #f9fafb;
}

/* Containers */
.container {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
}

/* Header / Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #ffffffcc;
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #e5e7eb;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 0;
}

.logo {
  font-weight: 700;
  font-size: 1.3rem;
  color: #1d4ed8;
}

.logo span {
  color: #111827;
}

.nav {
  display: flex;
  align-items: center;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.2rem;
}

.nav-links a {
  text-decoration: none;
  color: #4b5563;
  font-size: 0.95rem;
  transition: color 0.2s, transform 0.1s;
}

.nav-links a:hover {
  color: #2563eb;
  transform: translateY(-1px);
}

.nav-links a.active {
  color: #2563eb;
  font-weight: 600;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  margin-left: 1rem;
  font-size: 1.5rem;
  background: transparent;
  border: none;
  cursor: pointer;
}

/* Hero */
.hero {
  padding: 4rem 0 3rem;
  background: linear-gradient(135deg, #eff6ff