:root {
  --primary-bg: #ffffff;
  --card-bg: #f5f7fa;
  --card-hover-bg: #e8f0fe;
  --text-color: #333;
  --accent-color: #0074d9;
  --border-color: #dbe2ea;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', sans-serif;
  background: var(--primary-bg);
  color: var(--text-color);
}

.container {
  max-width: 1000px;
  margin: 40px auto;
  padding: 20px;
  box-sizing: border-box;
}

h1 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 32px;
  color: #111;
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.calc-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 24px 16px;
  text-align: center;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.03);
  transition: all 0.2s ease;
  position: relative;
}

.calc-card:hover {
  background: var(--card-hover-bg);
  transform: translateY(-3px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
  border-color: var(--accent-color);
}

.calc-card .icon {
  font-size: 2.4rem;
  margin-bottom: 12px;
  color: var(--accent-color);
}

.calc-card .title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #222;
}

@media (max-width: 500px) {
  .calc-card {
    padding: 18px 12px;
  }
  .calc-card .icon {
    font-size: 2rem;
  }
  .calc-card .title {
    font-size: 1rem;
  }
}