*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family: Arial, sans-serif;
}

.courses-section{
    padding: 40px 20px;
    background:#f5f7fa;
}

.container{
    max-width:1200px;
    margin:auto;
    text-align:center;
}

h1{
    font-size:2.5rem;
    margin-bottom:10px;
}

.subtitle{
    color:gray;
    margin-bottom:30px;
}

/* SEARCH */
.search-box{
    margin-bottom:30px;
}

.search-box input{
    width:100%;
    max-width:400px;
    padding:12px;
    border:1px solid #ccc;
    border-radius:8px;
    font-size:16px;
}

/* GRID */
.courses-grid{
    display:grid;
    grid-template-columns: repeat(auto-fit, minmax(280px,1fr));
    gap:20px;
}

/* CARD */
.course-card{
    background:white;
    padding:20px;
    border-radius:12px;
    box-shadow:0 4px 10px rgba(0,0,0,0.05);
    text-align:left;
    transition:0.3s;
}

.course-card:hover{
    transform:translateY(-5px);
}

.course-card h3{
    margin-bottom:10px;
}

.department{
    font-size:14px;
    color:#007BFF;
    margin-bottom:10px;
}

.description{
    font-size:14px;
    margin-bottom:15px;
}

.duration{
    display:block;
    font-size:13px;
    margin-bottom:15px;
    color:#555;
}

.btn{
    display:inline-block;
    padding:10px 15px;
    background:#007BFF;
    color:white;
    text-decoration:none;
    border-radius:6px;
}

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

/* TABLET */
@media(max-width:992px){
    h1{
        font-size:2rem;
    }
}

/* MOBILE */
@media(max-width:600px){
    h1{
        font-size:1.7rem;
    }

    .course-card{
        padding:15px;
    }
}

/* ============================= */
/* DESKTOP (LARGE SCREENS) */
/* ============================= */
@media (min-width: 1200px){

    .container{
        max-width: 1600px;
    }

    .courses-grid{
        grid-template-columns: repeat(4, 1fr); /* 4 columns on desktop */
        gap: 30px;
    }

    .course-card{
        padding: 25px;
    }

    .course-card h3{
        font-size: 20px;
    }

    .description{
        font-size: 15px;
        line-height: 1.6;
    }

    .btn{
        padding: 12px 18px;
        font-size: 15px;
    }
}

.nav-menu {
  display: flex;
  gap: 20px;
}

.hamburger {
  display: none;
  font-size: 24px;
  cursor: pointer;
}

/* Mobile */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
    flex-direction: column;
  }

  .nav-menu.active {
    display: flex;
  }

  .hamburger {
    display: block;
  }
}