* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  width: 100%;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #ffffff;
  color: #333;
}

.container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 40px 20px;
}

header {
  text-align: center;
  margin-bottom: 50px;
}

header h1 {
  font-size: 3rem;
  color: #2c3e50;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.buttons-container {
  display: flex;
  flex-direction: column;
  gap: 30px;
  width: 100%;
  max-width: 600px;
  flex: 1;
  justify-content: center;
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 35px 40px;
  text-decoration: none;
  border-radius: 16px;
  font-size: 1.4rem;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
  border: 2px solid transparent;
  min-height: 120px;
}

.btn i {
  font-size: 2rem;
}

.btn-instagram {
  background: #34495e;
  color: white;
  border-color: #34495e;
}

.btn-instagram:hover {
  background: #2c3e50;
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(52, 73, 94, 0.3);
}

.btn-signup {
  background: #3498db;
  color: white;
  border-color: #3498db;
}

.btn-signup:hover {
  background: #2980b9;
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(52, 152, 219, 0.3);
}

.btn-sms {
  background: #27ae60;
  color: white;
  border-color: #27ae60;
}

.btn-sms:hover {
  background: #229954;
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(39, 174, 96, 0.3);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  header h1 {
    font-size: 2.5rem;
  }
  
  .btn {
    padding: 30px 35px;
    font-size: 1.2rem;
    min-height: 100px;
  }
  
  .btn i {
    font-size: 1.8rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 20px 15px;
  }
  
  header h1 {
    font-size: 2rem;
    margin-bottom: 30px;
  }
  
  .buttons-container {
    gap: 20px;
  }
  
  .btn {
    padding: 25px 30px;
    font-size: 1.1rem;
    min-height: 90px;
  }
  
  .btn i {
    font-size: 1.6rem;
  }
  
  .btn span {
    font-size: 1.1rem;
  }
}