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

html, body {
  width: 100%;
  height: 100%;
  font-family: 'Helvetica Neue', sans-serif;
  background-color: #f9fcff;
  color: #003366;
  line-height: 1.6;
}

/* === Sticky Navbar === */
.navbar {
  position: sticky;
  top: 0;
  width: 100%;
  background: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  z-index: 10;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
}

.nav-menu {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-menu a {
  text-decoration: none;
  color: #004080;
  font-weight: 500;
}

.nav-menu a:hover {
  color: #00bfff;
}

/* === Hero Tagline Section === */
.hero-tagline {
  padding: 6rem 2rem 4rem;
  background: linear-gradient(to right, #e0f7ff, #ffffff);
  text-align: center;
}

.hero-tagline h1 {
  font-size: 2.8rem;
  margin-bottom: 1rem;
}

.hero-tagline p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

/* === CTA Buttons === */
.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.btn {
  background-color: #00bfff;
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
  transition: background-color 0.3s ease;
}

.btn:hover {
  background-color: #009acd;
}

.btn-secondary {
  background: transparent;
  border: 2px solid #00bfff;
  color: #00bfff;
}

.btn-secondary:hover {
  background-color: #00bfff;
  color: white;
}

/* === Graphic + Skyline Sections === */
.hero-graphic,
.hero-skyline {
  text-align: center;
  padding: 3rem 2rem;
}

.hero-graphic img,
.hero-skyline img {
  max-width: 90%;
  height: auto;
  border-radius: 8px;
}

/* === General Content Sections === */
.section {
  padding: 4rem 2rem;
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.section h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid #00bfff;
  display: inline-block;
  padding-bottom: 0.5rem;
}

.section p, .section li {
  font-size: 1rem;
  margin-bottom: 1rem;
  color: #444;
}

/* === Mobile Optimization === */
@media (max-width: 768px) {
  .hamburger {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    margin-left: auto;
    z-index: 20;
  }
  .hamburger span {
    display: block;
    width: 28px;
    height: 3px;
    margin: 5px 0;
    background: #203a43;
    border-radius: 2px;
    transition: 0.3s;
  }
  .nav-links {
    display: none;
    flex-direction: column;
    background: rgba(255,255,255,0.98);
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    box-shadow: 0 2px 8px rgba(32,58,67,0.07);
    padding: 1rem 0;
    z-index: 15;
  }
  .nav-links.open {
    display: flex;
  }
  .navbar-overlay {
    position: relative;
  }
  .hamburger.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }
  .hamburger.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  .navbar {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    background: rgba(255,255,255,0.97); /* solid background for readability */
    box-shadow: 0 2px 6px rgba(0,0,0,0.07);
  }

  .logo {
    font-size: 1.2rem;
    margin-bottom: 0.3rem;
  }

  .nav-menu {
    gap: 0.7rem;
  }
  .hero-tagline h1 {
    font-size: 2rem;
  }

  .hero-tagline p {
    font-size: 1rem;
  }

  .btn, .btn-secondary {
    width: 100%;
    padding: 1rem;
  }

  .section h2 {
    font-size: 1.5rem;
  }
}