🎯 Primary Button

<button class="btn btn-primary">Нажми меня</button>

.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: inherit;
}

.btn-primary {
  background: #667eea;
  color: white;
}

.btn-primary:hover {
  background: #5568d3;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

<button class="btn btn-gradient">Градиент</button>

.btn-gradient {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
}

.btn-gradient:hover {
  background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(118, 75, 162, 0.4);
}

<button class="btn btn-primary btn-icon">
  <span class="btn-icon-left">✨</span>
  <span>С иконкой</span>
</button>

.btn-icon {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-icon-left {
  font-size: 1.1em;
}

<button class="btn btn-primary btn-large">Большая кнопка</button>

.btn-large {
  padding: 16px 32px;
  font-size: 18px;
}

<button class="btn btn-primary btn-small">Маленькая</button>

.btn-small {
  padding: 8px 16px;
  font-size: 14px;
}