:root {
  --bg: #0f172a;
  --surface: #111827;
  --surface-soft: #1f2937;
  --text: #f8fafc;
  --muted: #cbd5e1;
  --accent: #38bdf8;
  --accent-dark: #0ea5e9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(180deg, #081025 0%, #111827 100%);
  color: var(--text);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(15, 23, 42, 0.96);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  max-width: 1180px;
  margin: 0 auto;
}

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

.logo {
  display: block;
  width: auto;
  height: 52px;
  object-fit: contain;
}

.mobile-logo {
  display: none;
}

.menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu li {
  position: relative;
}

.desktop-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.desktop-menu a,
.desktop-menu button {
  color: var(--text);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem 0;
  transition: color 0.2s ease;
}

.desktop-menu a:hover,
.desktop-menu button:hover,
.desktop-menu a:focus,
.desktop-menu button:focus {
  color: var(--accent);
}

.has-submenu > button::after {
  content: "▾";
  margin-left: 0.4rem;
  font-size: 0.8rem;
}

.submenu {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  min-width: 200px;
  background: rgba(15, 23, 42, 0.98);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 0.75rem;
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.35);
  padding: 0.75rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
}

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

.submenu li {
  padding: 0;
}

.submenu a {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--muted);
}

.submenu a:hover,
.submenu a:focus {
  color: var(--text);
  background: rgba(71, 85, 105, 0.15);
}

.hamburger {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  gap: 0.3rem;
  flex-direction: column;
  justify-content: center;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  border-radius: 999px;
  background: var(--text);
}

.mobile-menu-wrapper {
  display: none;
}

.hero {
  padding: 5rem 1.5rem 3rem;
  text-align: center;
}

.hero-content {
  max-width: 760px;
  margin: 0 auto;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin: 0;
  line-height: 1.05;
}

p {
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.8;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 2rem;
  padding: 0.95rem 1.8rem;
  border-radius: 999px;
  background: var(--accent);
  color: #020617;
  font-weight: 600;
  transition: transform 0.2s ease, background 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
  background: var(--accent-dark);
}

.feature,
.contact-section {
  max-width: 1020px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  border-bottom: 1px solid rgba(148, 163, 184, 0.08);
}

.feature h2,
.contact-section h2 {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.feature p,
.contact-section p {
  max-width: 720px;
}

.button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

@media (max-width: 900px) {
  .desktop-menu {
    display: none;
  }

  .hamburger {
    display: inline-flex;
  }

  .mobile-logo {
    display: block;
    width: 50px;
    height: 50px;
  }

  .desktop-logo {
    display: none;
  }

  .mobile-menu-wrapper {
    display: block;
    background: rgba(15, 23, 42, 0.98);
    border-top: 1px solid rgba(148, 163, 184, 0.12);
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.3s ease;
  }

  .mobile-menu-wrapper.open {
    max-height: 720px;
  }

  .mobile-menu {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    padding: 1rem 1.5rem 1.5rem;
  }

  .mobile-menu a,
  .mobile-menu button {
    display: flex;
    justify-content: space-between;
    width: 100%;
    color: var(--text);
    background: transparent;
    border: none;
    text-align: left;
    padding: 1rem 0;
    font-size: 1rem;
    cursor: pointer;
  }

  .mobile-menu button::after {
    content: "▾";
    transition: transform 0.25s ease;
  }

  .mobile-menu li.open > button::after {
    transform: rotate(-180deg);
  }

  .mobile-menu .submenu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    max-height: 0;
    overflow: hidden;
    background: rgba(15, 23, 42, 0.92);
    border-radius: 0.75rem;
    transition: max-height 0.3s ease;
  }

  .mobile-menu li.open > .submenu {
    max-height: 500px;
    padding: 0.5rem 0;
  }

  .mobile-menu .submenu a {
    padding: 0.85rem 1rem;
    color: var(--muted);
  }

  .mobile-menu .submenu a:hover,
  .mobile-menu .submenu a:focus {
    color: var(--text);
  }
}