/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

:root {
    --primary-color: #4e73df;
    --primary-dark: #224abe;
    --secondary-color: #858796;
    --success-color: #1cc88a;
    --info-color: #36b9cc;
    --warning-color: #f6c23e;
    --danger-color: #e74a3b;
    --dark-bg: #f8f9fc;
    --card-shadow: 0 .15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--dark-bg);
    color: #5a5c69;
    overflow-x: hidden;
}

/* Animations */
.fade-in {
    animation: fadeIn 0.8s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Glassmorphism Logic */
.glass-effect {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* Cards */
.card {
    border: none;
    border-radius: 1rem;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 .5rem 2rem 0 rgba(58, 59, 69, 0.25);
}

.card-header {
    background-color: #fff;
    border-bottom: 1px solid #e3e6f0;
    padding: 1rem 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Buttons */
.btn {
    border-radius: 0.5rem;
    padding: 0.5rem 1.5rem;
    font-weight: 600;
    transition: all 0.2s;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    border: none;
    box-shadow: 0 4px 15px rgba(78, 115, 223, 0.4);
}

.btn-primary:hover {
    background: linear-gradient(45deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
}

.btn-danger {
    background: linear-gradient(45deg, #e74a3b, #be2617);
    border: none;
}

.btn-success {
    background: linear-gradient(45deg, #1cc88a, #13855c);
    border: none;
}

/* Login Page Specifics */
.bg-login-image {
    background: url('https://images.unsplash.com/photo-1497294815431-9365093b7331?ixlib=rb-1.2.1&auto=format&fit=crop&w=1950&q=80');
    background-position: center;
    background-size: cover;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.login-overlay {
    background: linear-gradient(135deg, rgba(78, 115, 223, 0.8) 0%, rgba(34, 74, 190, 0.9) 100%);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

/* Tables */
.table thead th {
    border-bottom: 2px solid #e3e6f0;
    color: var(--primary-color);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.85rem;
}

.table td {
    vertical-align: middle;
}

/* Navbar */
.navbar {
    box-shadow: 0 .15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--primary-dark) 100%) !important;
}

.navbar-brand {
    font-weight: 800;
    letter-spacing: 1px;
    font-size: 1.5rem;
}

.lesson-preview-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}