/* ===== 全局基础 ===== */
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial;
  background: #f9fafb;
  color: #111;
}

/* ===== 通用区块 ===== */
.section {
  padding: 60px 20px;
  max-width: 1000px;
  margin: auto;
}

/* 标题 */
h2 {
  text-align: center;
  margin-bottom: 30px;
}

/* 按钮 */
.btn {
  padding: 12px 22px;
  margin: 5px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 14px;
}

.btn-primary {
  background: #6366f1;
  color: #fff;
}

.btn-secondary {
  border: 1px solid #fff;
  color: #fff;
}

/* ===== 移动端全局 ===== */
@media (max-width: 768px) {
  .section {
    padding: 40px 16px;
  }

  .btn {
    width: 100%;
  }
}