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

body {
  font-family: Arial, Helvetica, sans-serif;
  background: #f3f5f4;
  color: #2f7d6b;
  line-height: 1.6;
}

header {
  background: white;
  padding: 18px 6%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #e5e7eb;
}

.logo img {
  height: 64px;
}

.btn {
  background: linear-gradient(135deg, #46b27c, #6bcf98);
  color: white;
  padding: 12px 20px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: bold;
}

.hero {
  max-width: 1100px;
  margin: 70px auto;
  padding: 0 6%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.hero h1 {
  font-size: 54px;
  line-height: 1.1;
  margin-bottom: 24px;
  color: #2f7d6b;
}

.hero p {
  font-size: 20px;
  color: #5f6b68;
  margin-bottom: 30px;
}

.hero-card {
  background: white;
  border-radius: 22px;
  padding: 30px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

.hero-card img {
  width: 180px;
  display: block;
  margin: 0 auto 25px;
}

.hero-card ul {
  list-style: none;
}

.hero-card li {
  padding: 14px 0;
  border-bottom: 1px solid #eef2f7;
  font-size: 16px;
}

.hero-card li:last-child {
  border-bottom: none;
}

.features {
  max-width: 1100px;
  margin: 0 auto 80px;
  padding: 0 6%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature {
  background: white;
  padding: 28px;
  border-radius: 20px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.05);
}

.feature h3 {
  margin-bottom: 14px;
  color: #2f7d6b;
  font-size: 22px;
}

.feature p {
  color: #5f6b68;
  font-size: 16px;
}

.developer {
  max-width: 1100px;
  margin: 0 auto 80px;
  padding: 40px;
  background: linear-gradient(135deg, #46b27c, #6bcf98);
  border-radius: 28px;
  color: white;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 40px;
  align-items: center;
}

.developer img {
  width: 100%;
  background: white;
  border-radius: 18px;
  padding: 20px;
}

.developer h2 {
  margin-bottom: 18px;
  font-size: 34px;
}

.developer p {
  margin-bottom: 20px;
  color: #d9ebe5;
}

footer {
  text-align: center;
  padding: 30px;
  color: #6b7280;
  background: white;
  border-top: 1px solid #e5e7eb;
}

@media (max-width: 900px) {
  .hero,
  .developer {
    grid-template-columns: 1fr;
  }

  .features {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 42px;
  }
}