:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
}

/* Gradient Animations */
.bg-gradient {
    background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 50%, #dbeafe 100%);
    background-size: 200% 200%;
    animation: gradientBG 15s ease infinite;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.hero-section {
    background: linear-gradient(45deg, #eff6ff 0%, #dbeafe 50%, #bfdbfe 100%);
    background-size: 200% 200%;
    animation: heroGradient 10s ease infinite;
    padding: 5rem 1rem;
}

@keyframes heroGradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Header and Navigation Styles */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.logo-container {
    padding: 0;
    margin: 0;
}

.navbar {
    padding: 0;
    margin: 0;
}

.navbar-nav {
    gap: 1.5rem;
}

/* Logo Styles */
.logo {
    max-height: 60px;
    width: auto;
}

/* Tab Styles */
.tab-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    border: 1px solid #e5e7eb;
    background: white;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.tab-btn:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.tab-btn:hover:after {
    width: 100%;
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.tab-content {
    display: none;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s ease-out;
}

.tab-content.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* Card Styles */
.course-card {
    height: 100%;
    transform: translateY(0);
    transition: all 0.3s ease;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.course-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #6b7280;
    margin-bottom: 0.5rem;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    opacity: 0.9;
    transform: translateX(0);
    transition: all 0.2s ease;
}

.highlight-item:hover {
    opacity: 1;
    transform: translateX(5px);
}

.highlight-item i {
    color: #10b981;
}

/* Button Styles */
.btn {
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn:after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.btn:hover:after {
    width: 200%;
    height: 200%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.details-btn {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap 0.3s ease;
}

.details-btn:hover {
    gap: 0.75rem;
}

/* Footer Styles */
footer {
    border-top: 1px solid #e5e7eb;
}

footer .small {
    font-size: 0.875rem;
    color: #6b7280;
}

@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 1rem;
    }
    
    .tab-buttons {
        grid-template-columns: 1fr;
    }
}