:root {
  --bg: #09122a;
  --surface: #10203f;
  --text: #f4f7ff;
  --muted: #bfd0ef;
  --primary: #3cb3ff;
  --primary-dark: #1287d4;
  --light-bg: #f2f7ff;
  --dark-text: #0b1730;
}

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

body {
  font-family: "Open Sans", sans-serif;
  color: var(--dark-text);
  line-height: 1.6;
  background: white;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.hero {
  background: linear-gradient(130deg, rgba(9, 18, 42, 0.94), rgba(16, 32, 63, 0.88)),
    url("https://images.unsplash.com/photo-1521737604893-d14cc237f11d?auto=format&fit=crop&w=1500&q=80")
      center/cover;
  color: var(--text);
  padding-bottom: 5rem;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 0;
}

.logo {
  font-family: "Montserrat", sans-serif;
  font-weight: 800;
  text-decoration: none;
  color: inherit;
  letter-spacing: 0.5px;
}
.logo span {
  color: var(--primary);
}

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

.menu a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}

.menu-btn {
  display: none;
}

.hero-content {
  padding-top: 4rem;
  max-width: 720px;
}

.tag,
.section-tag {
  text-transform: uppercase;
  letter-spacing: 1.4px;
  font-weight: 700;
  color: var(--primary);
  font-size: 0.82rem;
}

.hero h1 {
  font-family: "Montserrat", sans-serif;
  font-size: clamp(2rem, 6vw, 3.3rem);
  line-height: 1.2;
  margin: 0.8rem 0 1.2rem;
}

.hero p {
  color: var(--muted);
}

.hero-actions {
  display: flex;
  gap: 0.8rem;
  margin-top: 1.8rem;
}

.btn {
  display: inline-block;
  padding: 0.78rem 1.1rem;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
}

.primary {
  background: var(--primary);
  color: #061021;
}

.primary:hover {
  background: var(--primary-dark);
}

.secondary {
  border: 1px solid rgba(255, 255, 255, 0.5);
  color: white;
}

.section {
  padding: 4rem 0;
}

.section h2 {
  font-family: "Montserrat", sans-serif;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  margin: 0.6rem 0 1rem;
}

.card-grid {
  margin-top: 1.6rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--light-bg);
  border-radius: 14px;
  padding: 1.2rem;
}

.card h3 {
  font-family: "Montserrat", sans-serif;
  color: var(--primary-dark);
}

.dark {
  background: var(--bg);
  color: var(--text);
}

.topics {
  margin-top: 1.3rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.topics article {
  background: var(--surface);
  border-radius: 14px;
  padding: 1.2rem;
}

.testimonials {
  margin-top: 1.2rem;
  display: grid;
  gap: 1rem;
}

.testimonials blockquote {
  background: var(--light-bg);
  padding: 1.2rem;
  border-radius: 14px;
  border-left: 4px solid var(--primary);
}

.testimonials cite {
  display: block;
  margin-top: 0.75rem;
  font-style: normal;
  color: #32476e;
}

.footer {
  background: #091022;
  color: white;
  padding: 2.6rem 0;
}

.footer-grid {
  display: grid;
  gap: 1.2rem;
  grid-template-columns: 1.5fr 1fr auto;
  align-items: center;
}

@media (max-width: 760px) {
  .menu-btn {
    display: block;
    font-size: 1.4rem;
    color: white;
    background: none;
    border: 0;
    cursor: pointer;
  }

  .menu {
    position: absolute;
    top: 70px;
    right: 4%;
    background: rgba(9, 18, 42, 0.95);
    border-radius: 10px;
    flex-direction: column;
    padding: 1rem;
    display: none;
  }

  .menu.open {
    display: flex;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}