body {
  margin:0;
  font-family: 'Segoe UI', sans-serif;
  background:#f4f9fb;
  color:#1f2937;
}

.hero {
  background:linear-gradient(rgba(0, 128, 128, 0.7), rgba(0, 128, 128, 0.7)),
  url('https://images.unsplash.com/photo-1588776814546-ec7e7c3b5c27') center/cover;
  height:70vh;
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  color:white;
}

.hero h1 {
  font-size:3rem;
  margin-bottom:10px;
}

.hero p {
  font-size:1.2rem;
  margin-bottom:20px;
}

.btn {
  background:#10b981;
  padding:12px 25px;
  color:white;
  border-radius:25px;
  text-decoration:none;
}

.navbar {
  display:flex;
  justify-content:center;
  background:white;
  box-shadow:0 2px 8px rgba(0,0,0,0.1);
  position:sticky;
  top:0;
  z-index:10;
}

.navbar a {
  padding:15px 20px;
  text-decoration:none;
  color:#0f766e;
  font-weight:500;
}

.navbar a:hover {
  color:#10b981;
}

.card {
  max-width:1000px;
  margin:40px auto;
  padding:40px;
  background:white;
  border-radius:12px;
  box-shadow:0 4px 20px rgba(0,0,0,0.05);
}

.card.light {
  background:#e6f7f7;
}

h2 {
  color:#0f766e;
  margin-bottom:20px;
}

.grid {
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(200px,1fr));
  gap:15px;
}

.box {
  background:#d1fae5;
  padding:15px;
  border-radius:8px;
  text-align:center;
  font-weight:500;
}

.testimonial {
  background:white;
  padding:20px;
  border-left:4px solid #10b981;
  margin-bottom:15px;
  border-radius:6px;
}

footer {
  background:#0f172a;
  color:white;
  text-align:center;
  padding:20px;
}

.hero-slider {
  position: relative;
  height: 85vh;
  overflow: hidden;
}

.slides {
  width: 100%;
  height: 100%;
  position: relative;
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
}

.slide.active {
  opacity: 1;
  z-index: 1;
}

.slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 70, 80, 0.45);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: white;
  text-align: center;
  padding: 20px;
}

.overlay h1 {
  font-size: 4rem;
  margin-bottom: 15px;
}

.overlay p {
  font-size: 1.3rem;
  max-width: 700px;
  margin-bottom: 30px;
}

.btn {
  background: #14b8a6;
  color: white;
  padding: 14px 32px;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 600;
}

.btn:hover {
  background: #0f766e;
}

.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.25);
  border: none;
  color: white;
  font-size: 2rem;
  width: 55px;
  height: 55px;
  border-radius: 50%;
  cursor: pointer;
  z-index: 10;
  backdrop-filter: blur(5px);
}

.prev {
  left: 25px;
}

.next {
  right: 25px;
}

.slider-btn:hover {
  background: rgba(255,255,255,0.4);
}