Clean and Scalable Professional CSS Structure Template

				
					/*-------------------------------------
1. Base Styles
--------------------------------------*/
:root {
  --primary-color: #0d6efd;
  --secondary-color: #6c757d;
  --font-main: 'Helvetica Neue', sans-serif;
  --text-color: #212529;
  --bg-color: #ffffff;
}

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

body {
  font-family: var(--font-main);
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.6;
}

/*-------------------------------------
2. Layout
--------------------------------------*/
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
}

/*-------------------------------------
3. Reusable Components
--------------------------------------*/
.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  background-color: var(--primary-color);
  color: #fff;
  border: none;
  border-radius: 4px;
  text-decoration: none;
  transition: background 0.3s;
}

.btn:hover {
  background-color: #0056b3;
}

/*-------------------------------------
4. Banner Section
--------------------------------------*/
.banner {
  position: relative;
  background: url('your-banner-image.jpg') center/cover no-repeat;
  color: #fff;
  text-align: center;
  padding: 100px 20px;
}

.banner::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5); /* dark overlay */
  z-index: 0;
}

.banner-content {
  position: relative;
  z-index: 1;
}

.banner h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.banner p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
}

.banner .btn {
  font-size: 1rem;
}

/*-------------------------------------
5. Sections
--------------------------------------*/
/* Add custom sections like .about, .services, .contact etc. */

/*-------------------------------------
6. Media Queries
--------------------------------------*/
@media (max-width: 768px) {
  .banner h1 {
    font-size: 2rem;
  }
  .banner p {
    font-size: 1rem;
  }
}