* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', sans-serif;
}

body {
  background: linear-gradient(to right, #0f2027, #203a43, #2c5364);
  color: #fff;
  padding: 0;
  margin: 0;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 5rem 2rem;
}

header h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

header p {
  font-size: 1.25rem;
  max-width: 600px;
  margin-bottom: 2rem;
}

.btn-whatsapp {
  background-color: #25d366;
  color: white;
  padding: 1rem 2rem;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  text-decoration: none;
  transition: background 0.3s ease;
}

.btn-whatsapp:hover {
  background-color: #1ebc59;
}

section {
  padding: 4rem 2rem;
  text-align: center;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.feature {
  background: rgba(255, 255, 255, 0.05);
  padding: 2rem;
  border-radius: 12px;
  transition: transform 0.3s ease;
}

.feature:hover {
  transform: scale(1.05);
}

.feature h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.portfolio img {
  max-width: 100%;
  border-radius: 12px;
  box-shadow: 0 5px 25px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease;
}

.portfolio img:hover {
  transform: scale(1.02);
}

footer {
  background-color: #0f2027;
  text-align: center;
  padding: 3rem 1rem;
  font-size: 1.1rem;
}

.avatar-sensei {
  width: 160px;
  height: 160px;
  object-fit: cover;
  border-radius: 50%;
  margin-bottom: 2rem;
  box-shadow: 0 4px 24px rgba(0,0,0,0.25);
  border: 4px solid #25d366;
}

.portfolio-img {
  margin-top: 2rem;
  max-width: 600px;
  width: 100%;
  border-radius: 18px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.25);
  border: 2px solid #25d366;
}