:root {
    --primary: #00f3ff;
    --secondary: #9d4edd;
    --dark: #0a0a1a;
    --darker: #050510;
    --light: #e0f7fa;
    --glass: rgba(20, 20, 40, 0.7);
    --neon-glow: 0 0 10px var(--primary), 0 0 20px var(--primary), 0 0 30px var(--primary);
    --transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Exo 2', sans-serif;
    background-color: var(--darker);
    color: var(--light);
    min-height: 100vh;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(157, 78, 221, 0.15) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(0, 243, 255, 0.1) 0%, transparent 20%),
        linear-gradient(to bottom, var(--darker), var(--dark));
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.container.narrow {
    max-width: 480px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid rgba(0, 243, 255, 0.2);
    margin-bottom: 30px;
    position: relative;
    flex-wrap: wrap;
    gap: 20px;
}

header::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    box-shadow: var(--neon-glow);
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
    font-family: 'Orbitron', sans-serif;
}

.logo-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--neon-glow);
    font-size: 1.5rem;
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 900;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: 1px;
}

.subtitle {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: -5px;
    letter-spacing: 2px;
}

/* Stats */
.stats-container {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 20px;
}

.stat-card {
    background: var(--glass);
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    min-width: 180px;
    border: 1px solid rgba(157, 78, 221, 0.2);
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--secondary);
    box-shadow: 0 0 20px rgba(157, 78, 221, 0.3);
}

.stat-value {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.stat-label {
    margin-top: 10px;
    font-size: 0.9rem;
    opacity: 0.8;
    letter-spacing: 1px;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* Glassmorphism Cards */
.card {
    background: var(--glass);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 25px;
    border: 1px solid rgba(0, 243, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 243, 255, 0.3);
    box-shadow: 0 12px 40px rgba(0, 243, 255, 0.1), var(--neon-glow);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(0, 243, 255, 0.05), transparent);
    z-index: -1;
}

.card-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.5rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--primary);
}

.card-title i {
    font-size: 1.3rem;
}

/* Form Elements */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--primary);
    font-size: 0.9rem;
    letter-spacing: 1px;
}

.form-control {
    width: 100%;
    padding: 15px;
    background: rgba(10, 15, 30, 0.7);
    border: 1px solid rgba(0, 243, 255, 0.2);
    border-radius: 10px;
    color: var(--light);
    font-family: 'Exo 2', sans-serif;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.2);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

.form-actions {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: 15px 30px;
    border: none;
    border-radius: 10px;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    letter-spacing: 1px;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary), #0099ff);
    color: var(--dark);
    box-shadow: 0 5px 15px rgba(0, 243, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 243, 255, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-secondary:hover {
    background: rgba(0, 243, 255, 0.1);
    box-shadow: var(--neon-glow);
}

.btn-outline {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--light);
    padding: 10px 20px;
    font-family: 'Exo 2', sans-serif;
    font-weight: 600;
    border-radius: 8px;
    transition: var(--transition);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary);
}

/* Search and Filter Section */
.search-filter-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.search-filter-container {
    margin-bottom: 30px;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    align-items: end;
}

@media (max-width: 768px) {
    .search-filter-container {
        grid-template-columns: 1fr;
    }
}

.search-box {
    position: relative;
}

.search-input {
    width: 100%;
    padding: 15px 15px 15px 50px;
    background: rgba(10, 15, 30, 0.7);
    border: 1px solid rgba(0, 243, 255, 0.2);
    border-radius: 10px;
    color: var(--light);
    font-family: 'Exo 2', sans-serif;
    font-size: 1rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.2);
}

.search-icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary);
    font-size: 1.2rem;
}

.filter-options {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-group {
    flex: 1;
    min-width: 150px;
}

.filter-select {
    width: 100%;
    padding: 15px;
    background: rgba(10, 15, 30, 0.7);
    border: 1px solid rgba(0, 243, 255, 0.2);
    border-radius: 10px;
    color: var(--light);
    font-family: 'Exo 2', sans-serif;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.2);
}

/* Flash Messages */
.flash {
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-weight: 600;
    animation: slideIn 0.3s ease-out;
}

.flash.error {
    background: rgba(255, 71, 87, 0.2);
    border: 1px solid #ff4757;
    color: #ff4757;
}

.flash.success {
    background: rgba(0, 255, 136, 0.2);
    border: 1px solid #00ff88;
    color: #00ff88;
}

/* Lessons Display */
.lessons-container {
    margin-top: 30px;
}

.lesson-item {
    background: rgba(15, 20, 40, 0.7);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    border-left: 4px solid var(--primary);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.lesson-item:hover {
    transform: translateX(5px);
    background: rgba(20, 25, 50, 0.8);
}

.lesson-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 243, 255, 0.05), transparent);
    z-index: -1;
}

.lesson-source {
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.lesson-text {
    line-height: 1.6;
    margin-bottom: 10px;
    white-space: pre-wrap;
}

.lesson-date {
    font-size: 0.8rem;
    opacity: 0.7;
    display: flex;
    align-items: center;
    gap: 5px;
}

.lesson-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.action-btn {
    background: transparent;
    border: none;
    color: var(--light);
    cursor: pointer;
    padding: 8px 15px;
    border-radius: 5px;
    transition: var(--transition);
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.delete-btn:hover {
    color: #ff4757;
}

/* No Results Message */
.no-results {
    text-align: center;
    padding: 40px 20px;
    background: rgba(10, 15, 30, 0.5);
    border-radius: 15px;
    border: 2px dashed rgba(0, 243, 255, 0.3);
}

.no-results-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 20px;
    opacity: 0.5;
}

/* Animations */
@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 243, 255, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(0, 243, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 243, 255, 0); }
}

.pulse {
    animation: pulse 2s infinite;
}

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

.slide-in {
    animation: slideIn 0.3s ease-out;
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 30px;
    padding: 20px;
    opacity: 0.6;
    font-size: 0.85rem;
    border-top: 1px solid rgba(0, 243, 255, 0.1);
}

/* Badge */
.badge {
    display: inline-block;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    color: var(--dark);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 15px;
    font-family: 'Orbitron', sans-serif;
}

/* Responsive Adjustments */
@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    .logo-text {
        font-size: 1.4rem;
    }
    
    .card {
        padding: 20px;
    }
    
    .btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }
    
    .stat-card {
        min-width: 140px;
        padding: 15px;
    }
    
    .stat-value {
        font-size: 2rem;
    }
    
    .filter-options {
        flex-direction: column;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* Login page specific */
.card h2 {
    font-family: 'Orbitron', sans-serif;
    color: var(--primary);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.card form label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: var(--primary);
    font-size: 0.9rem;
}

.card form input {
    width: 100%;
    padding: 12px 15px;
    background: rgba(10, 15, 30, 0.7);
    border: 1px solid rgba(0, 243, 255, 0.2);
    border-radius: 8px;
    color: var(--light);
    font-family: 'Exo 2', sans-serif;
    font-size: 1rem;
    margin-bottom: 15px;
    transition: var(--transition);
}

.card form input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.2);
}

.card form button {
    width: 100%;
    padding: 15px;
    margin-top: 10px;
}