/* Основные стили */
body {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  color: #333;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

.btn {
  background: #4CAF50;
  color: white;
  padding: 12px 25px;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s;
}

.btn:hover {
  background: #3e8e41;
  transform: translateY(-3px);
}

/* Шапка */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.logo {
  font-size: 24px;
  font-weight: 700;
}

.logo span {
  color: #4CAF50;
}

.nav a {
  margin: 0 15px;
  text-decoration: none;
  color: #333;
}

/* Hero-блок */
.hero {
  display: flex;
  align-items: center;
  padding: 80px 0;
}

.hero h1 {
  font-size: 48px;
  margin-bottom: 20px;
}

.hero-image {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

/* Преимущества */
.features {
  padding: 80px 0;
  background: #f9f9f9;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 40px;
}

.feature {
  text-align: center;
  padding: 30px;
  background: white;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.feature i {
  font-size: 40px;
  color: #4CAF50;
  margin-bottom: 20px;
}

/* Калькулятор */
.calculator {
  padding: 80px 0;
}

.form-group {
  margin-bottom: 20px;
}

input[type="range"] {
  width: 100%;
}

.result {
  margin-top: 30px;
  padding: 20px;
  background: #f0f8ff;
  border-radius: 10px;
  display: none;
}

/* Адаптивность */
@media (max-width: 768px) {
  .hero {
    flex-direction: column;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
}