/* Main Styles */
body {
    font-family: 'Hind Siliguri', 'SolaimanLipi', sans-serif;
    line-height: 1.6;
}

/* Navigation */
.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

/* Buttons */
.btn {
    border-radius: 5px;
    font-weight: 500;
}

.btn-primary {
    background: linear-gradient(45deg, #4361ee, #3f37c9);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(45deg, #3f37c9, #4361ee);
}

/* Cards */
.card {
    border-radius: 10px;
    border: 1px solid #eaeaea;
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

/* Course Cards */
.course-card {
    height: 100%;
}

.course-card img {
    height: 180px;
    object-fit: cover;
}

/* Progress bars */
.progress {
    border-radius: 10px;
}

.progress-bar {
    background: linear-gradient(45deg, #4361ee, #4cc9f0);
}

/* Forms */
.form-control {
    border-radius: 5px;
    padding: 10px 15px;
    border: 1px solid #ddd;
}

.form-control:focus {
    border-color: #4361ee;
    box-shadow: 0 0 0 0.2rem rgba(67, 97, 238, 0.25);
}

/* Tables */
.table th {
    font-weight: 600;
    border-top: none;
}

/* Alerts */
.alert {
    border-radius: 10px;
    border: none;
}

/* Hero section */
.hero-section {
    background: linear-gradient(135deg, #4361ee 0%, #4cc9f0 100%);
    color: white;
}

/* Footer */
footer a:hover {
    color: #fff !important;
    text-decoration: underline;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .card img {
        height: 150px;
    }
}

/* Loading spinner */
.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid #4361ee;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}