:root {
  color-scheme: dark;
  font-family: Inter, system-ui, sans-serif;
  line-height: 1.5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
}

.topbar {
  width: 100%;
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  backdrop-filter: blur(12px);
  background: rgba(4, 10, 24, 0.75);
}

.brand strong {
  display: block;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.brand span {
  color: #9db3cf;
  font-size: 0.9rem;
}

.navigation .menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1rem;
  align-items: center;
}

.menu-item {
  position: relative;
}

.menu-link {
  color: inherit;
  text-decoration: none;
  padding: 0.55rem 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 0.65rem;
  transition: background 180ms ease, transform 180ms ease;
}

.menu-link:hover,
.menu-link:focus {
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-1px);
}

.menu-icon::before,
.card-icon::before {
  content: attr(data-icon);
  display: inline-block;
  min-width: 1.4rem;
  text-align: center;
}

.has-submenu:hover .submenu,
.has-submenu:focus-within .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.submenu {
  position: absolute;
  left: 0;
  top: calc(100% + 0.5rem);
  min-width: 220px;
  padding: 0.75rem 0;
  list-style: none;
  margin: 0;
  background: rgba(8, 18, 45, 0.98);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 1rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.18);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
}

.submenu li {
  margin: 0;
}

.submenu a {
  display: block;
  padding: 0.75rem 1rem;
  color: inherit;
  text-decoration: none;
}

.submenu a:hover {
  background: rgba(255, 255, 255, 0.05);
}

.hero {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 74vh;
  padding: 4rem 2rem;
  text-align: center;
  background-size: cover;
  background-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 860px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.5rem, 4vw, 4.25rem);
  letter-spacing: -0.06em;
}

.hero p {
  margin: 1.5rem auto 0;
  max-width: 720px;
  color: rgba(247, 249, 252, 0.9);
  font-size: 1.05rem;
}

.hero-actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.95rem 1.4rem;
  border-radius: 999px;
  background: var(--accent, #00a7ff);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  transition: transform 180ms ease, filter 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

.section-grid {
  padding: 3rem 2rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-block {
  margin-bottom: 2rem;
}

.section-block h2 {
  margin-bottom: 0.5rem;
}

.section-block p {
  margin-top: 0;
  color: rgba(255, 255, 255, 0.8);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.card {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 1rem;
  padding: 1.2rem 1.2rem;
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.04);
  color: inherit;
  text-decoration: none;
  transition: transform 180ms ease, background 180ms ease;
}

.card:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.08);
}

.card-icon {
  font-size: 1.75rem;
}

.footer {
  padding: 2rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.65);
}

@media (max-width: 900px) {
  .topbar {
    flex-direction: column;
    gap: 1rem;
  }

  .navigation .menu {
    flex-wrap: wrap;
    justify-content: center;
  }

  .submenu {
    position: static;
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    background: transparent;
    box-shadow: none;
    border: none;
    display: grid;
  }

  .submenu a {
    padding: 0.5rem 0.75rem;
  }
}