:root {
    --primary-color: #2563eb;
    --secondary-color: #1e293b;
    --accent-color: #f59e0b;
    --bg-light: #f8fafc;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: #ffffff;
    color: #1e293b;
}

h1, h2, h3, .navbar-brand {
    font-family: 'Poppins', sans-serif;
}

/* Course Cards */
.course-card {
    transition: transform 0.3s ease, shadow 0.3s ease;
    border-radius: 12px;
    overflow: hidden;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1) !important;
}

.course-card img {
    height: 200px;
    object-fit: cover;
}

/* Dashboards */
.sidebar {
    background: #ffffff;
    border-right: 1px solid #e2e8f0;
    min-height: calc(100vh - 70px);
}

.nav-link-custom {
    color: #64748b;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    border-radius: 8px;
    transition: 0.2s;
}

.nav-link-custom:hover, .nav-link-custom.active {
    background: #eff6ff;
    color: var(--primary-color);
}

.nav-link-custom i {
    width: 25px;
}

/* Learning Interface */
.video-container {
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 16/9;
}