/* Classes Page Styles */
:root {
    --primary-color: #000000;
    --secondary-color: #333333;
    --accent-color: #f59e0b;
    --text-color: #000000;
    --light-gray: #f0f0f0;
    --dark-gray: #e0e0e0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --border-radius: 12px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --card-bg: #ffffff;
    --chat-bg: #FFF0F5;
    --header-text: #ffffff;
    --header-bg: #000000;
    --user-bubble: #000000;
    --bot-bubble: #ffffff;
    --input-bg: #ffffff;
    --input-border: #cccccc;
    --input-text: #000000;
    --border-color: #cccccc;
    --hover-color: #f6f8fa;
}

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

html, body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--chat-bg);
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

/* Main header styles */
.main-header {
    background: var(--header-bg);
    color: var(--header-text);
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    width: 100%;
    height: 100px;
    border-radius: 0;
}

.logo-container {
    display: flex;
    align-items: center;
    padding: 0;
    margin: 0;
}

.logo {
    height: 100px;
    width: auto;
}

.header-actions {
    display: flex;
    align-items: center;
}

.home-btn {
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.home-btn:hover {
    background: var(--secondary-color);
}

/* View Toggle Section */
.view-toggle-section {
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
}

.toggle-buttons {
    display: flex;
    gap: 0.25rem;
    background: var(--light-gray);
    padding: 0.15rem;
    border-radius: 8px;
}

.toggle-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: var(--secondary-color);
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
}

.toggle-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

.toggle-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow);
}

.toggle-btn i {
    font-size: 0.8rem;
}

/* Filters Section */
.filters-section {
    padding: 1rem;
    margin-bottom: 1rem;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
    align-items: end;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.filter-group label {
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.9rem;
}

.filter-group select {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background: white;
    transition: border-color 0.3s ease;
}

.filter-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 124, 255, 0.1);
}

/* Loading Indicator */
.loading-indicator {
    text-align: center;
    padding: 3rem;
}

.loading-indicator i {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--error-color);
}

/* Classes Grid */
.classes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
    height: calc(100vh - 200px);
    overflow-y: auto;
    align-content: start;
    padding: 1rem;
}

/* Master Class Styles */
.master-class-card {
    border: 2px solid var(--accent-color);
    background: linear-gradient(135deg, #fff9e6 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
}

.master-class-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), #fbbf24);
}

.master-class-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.master-class-badge i {
    font-size: 0.7rem;
}

.master-class-card .class-header {
    flex-wrap: wrap;
    gap: 0.75rem;
}

.master-class-card .class-header h3 {
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.master-class-card .class-info-item {
    color: var(--secondary-color);
}

.master-class-card .class-info-item i {
    color: var(--accent-color);
}

.class-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
    color: var(--text-color);
}

.class-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
    border-color: var(--primary-color);
}

.class-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), #764ba2);
}

.class-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
    gap: 1rem;
}

.class-card h3 {
    color: var(--primary-color);
    font-size: 1.2rem;
    margin: 0;
    font-weight: 700;
    line-height: 1.3;
    flex: 1;
}

.class-info {
    display: grid;
    gap: 0.3rem;
    margin-bottom: 0.75rem;
}

.class-info-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.9rem;
    line-height: 1.4;
}

.class-info-item i {
    color: var(--primary-color);
    width: 16px;
    text-align: center;
}

.class-description {
    color: var(--text-color);
    font-size: 0.85rem;
    line-height: 1.4;
    margin-top: 0.75rem;
    margin-bottom: 0.75rem;
}


.register-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    text-decoration: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    white-space: nowrap;
    flex-shrink: 0;
}

.register-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
}

.register-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.register-btn i {
    font-size: 1rem;
}


/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: white;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-header {
        height: 60px;
        padding: 0 15px;
    }
    
    .logo {
        height: 60px;
    }
    
    .home-btn {
        padding: 6px 12px;
        font-size: 0.85rem;
    }
    
    .filters-section {
        padding: 0.75rem;
        margin-bottom: 0.5rem;
        grid-template-columns: 1fr 1fr 1fr;
        gap: 0.5rem;
    }
    
    .filter-group {
        gap: 0.25rem;
    }
    
    .filter-group label {
        font-size: 0.8rem;
        font-weight: 500;
    }
    
    .filter-group select {
        padding: 0.5rem;
        font-size: 0.9rem;
    }
    
    
    .classes-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
        height: calc(100vh - 120px);
        padding: 0.75rem;
        margin-top: 0;
    }
    
    .class-card {
        padding: 0.75rem;
    }
    
    .class-header {
        margin-bottom: 0.6rem;
        gap: 0.75rem;
    }
    
    .class-card h3 {
        font-size: 1.1rem;
    }
    
    .class-info {
        gap: 0.25rem;
        margin-bottom: 0.6rem;
    }
    
    .class-info-item {
        font-size: 0.85rem;
    }
    
    .class-description {
        font-size: 0.8rem;
        margin-top: 0.6rem;
        margin-bottom: 0.6rem;
    }
    
    .register-btn {
        padding: 0.35rem 0.7rem;
        font-size: 0.7rem;
        gap: 0.25rem;
    }
}

@media (max-width: 480px) {
    .main-header {
        height: 50px;
        padding: 0 10px;
    }
    
    .logo {
        height: 50px;
    }
    
    .home-btn {
        padding: 4px 8px;
        font-size: 0.75rem;
    }
    
    .filters-section {
        padding: 0.5rem;
        margin-bottom: 0.25rem;
        grid-template-columns: 1fr 1fr 1fr;
        gap: 0.4rem;
    }
    
    .filter-group {
        gap: 0.2rem;
    }
    
    .filter-group label {
        font-size: 0.75rem;
    }
    
    .filter-group select {
        padding: 0.4rem;
        font-size: 0.85rem;
    }
    
    
    .classes-grid {
        height: calc(100vh - 95px);
        padding: 0.5rem;
        gap: 0.4rem;
    }
    
    .class-card {
        padding: 0.6rem;
    }
    
    .class-header {
        margin-bottom: 0.5rem;
        gap: 0.5rem;
    }
    
    .class-card h3 {
        font-size: 1rem;
    }
    
    .class-info {
        gap: 0.2rem;
        margin-bottom: 0.5rem;
    }
    
    .class-info-item {
        font-size: 0.8rem;
        gap: 0.3rem;
    }
    
    .class-description {
        font-size: 0.75rem;
        margin-top: 0.5rem;
        margin-bottom: 0.5rem;
        line-height: 1.3;
    }
    
    .register-btn {
        padding: 0.3rem 0.6rem;
        font-size: 0.65rem;
        gap: 0.2rem;
    }
    
    .register-btn i {
        font-size: 0.6rem;
    }
}