/* css/filters.css  */

body {
    background-color: #f8f9fa; 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.people-growth-container {
    max-width: 1400px;
    margin: 40px auto;
    padding: 0 20px;
}

/* Filter Section Styling */
.filter-container {
    background-color: #ffffff;
    padding: 25px 30px;
    border-radius: 16px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.07);
    margin-bottom: 40px;
}

.filter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 25px;
}

.filter-header h2 {
    margin: 0;
    font-size: 1.8em;
    color: #2c3e50;
    font-weight: 600;
}

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

.search-container {
    position: relative;
    min-width: 320px;
}

.search-container #search-bar {
    width: 100%;
    padding: 12px 20px 12px 45px;
    border-radius: 25px;
    border: 1px solid #dfe6e9;
    font-size: 1em;
    transition: all 0.3s ease;
}

.search-container #search-bar:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.15);
}

.search-container::before {
    content: '🔍';
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: #b2bec3;
    font-size: 1.1em;
}

/* Clear All Button */
.clear-filters-btn {
    background: #e74c3c;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 25px;
    font-size: 0.95em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    opacity: 0.7;
    pointer-events: none;
    transform: scale(0.95);
}

.clear-filters-btn.active {
    opacity: 1;
    pointer-events: all;
    transform: scale(1);
}

.clear-filters-btn.active:hover {
    background: #c0392b;
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.3);
}

.filter-count {
    background: #007bff;
    color: white;
    font-size: 0.8em;
    padding: 4px 8px;
    border-radius: 12px;
    font-weight: 600;
    margin-left: 8px;
    display: none;
    transform: scale(0);
    transition: transform 0.3s ease;
}

.filter-count.visible {
    display: inline-block;
    transform: scale(1);
}

.filter-groups {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
}

.filter-group {
    border-top: 1px solid #f1f1f1;
    padding-top: 15px;
}

.filter-group h3 {
    font-size: 1.15em;
    margin-top: 0;
    margin-bottom: 15px;
    color: #34495e;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    transition: color 0.3s ease;
}

.filter-group h3:hover {
    color: #2c3e50;
}

.filter-group h3::after {
    content: '▾';
    transition: transform 0.3s ease;
    font-size: 0.9em;
}

.filter-group.collapsed .checkbox-list {
    display: none;
}

.filter-group.collapsed h3::after {
    transform: rotate(-90deg);
}

.checkbox-list {
    max-height: 180px;
    overflow-y: auto;
    padding-right: 10px;
    will-change: scroll-position;
    contain: layout style paint;
}

.checkbox-list::-webkit-scrollbar {
    width: 5px;
}
.checkbox-list::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}
.checkbox-list::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 10px;
}
.checkbox-list::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

.checkbox-item {
    display: block;
    margin-bottom: 8px;
}

.checkbox-item label {
    cursor: pointer;
    color: #555;
    display: flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 8px;
    transition: all 0.2s ease;
    user-select: none;
    position: relative;
    contain: layout style;
}

.checkbox-item label:hover {
    background-color: #f8f9fa;
    color: #2c3e50;
    transform: translateX(3px);
}

.checkbox-item label.disabled {
    color: #bbb;
    cursor: not-allowed;
    opacity: 0.5;
}

.checkbox-item label.disabled:hover {
    background-color: transparent;
    transform: none;
}

.checkbox-item input[type="checkbox"] {
    cursor: pointer;
    width: 16px;
    height: 16px;
    margin-right: 8px;
    accent-color: #007bff;
}

.checkbox-item input[type="checkbox"]:disabled {
    cursor: not-allowed;
}

.checkbox-text {
    flex: 1;
}

/* count badges */
.option-count {
    background: #e9ecef;
    color: #6c757d;
    font-size: 0.75em;
    padding: 2px 6px;
    border-radius: 10px;
    margin-left: auto;
    font-weight: 500;
    min-width: 20px;
    text-align: center;
    transition: all 0.2s ease;
}

.checkbox-item label.disabled .option-count {
    background: #f8f9fa;
    color: #ccc;
}


#select_header {
    text-align: center;
    font-size: 2em;
    margin-bottom: 40px;
    color: #2c3e50;
    font-weight: 600;
    transition: all 0.3s ease;
}

.results-summary {
    text-align: center;
    color: #6c757d;
    font-size: 1.1em;
    margin-bottom: 30px;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.intern-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 25px;
    /* grid performance */
    contain: layout style;
}

/* Intern Cards with Lazy Loading */
.intern-card {
    background-color: #ffffff;
    padding: 25px 15px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    contain: layout style paint;
    will-change: transform, opacity;
}

.intern-card:hover {
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.intern-card a {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

/* lazy loading for images */
.intern-card .interns_prof_img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 20px;
    border: 5px solid #fff;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    contain: layout style paint;
}

.intern-card .interns_prof_img[src] {
    background: none;
    animation: none;
}

/* Loading animation for images */
@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.intern-name {
    font-weight: 600;
    font-size: 1.2em;
    color: #333;
    margin-bottom: 8px;
}

.intern-details {
    font-size: 0.95em;
    color: #6c757d;
    line-height: 1.5;
}

.intern-college, .intern-team {
    display: block;
}

#no-results {
    text-align: center;
    font-size: 1.5em;
    color: #777;
    margin-top: 50px;
    width: 100%;
    grid-column: 1 / -1; 
    padding: 40px 20px;
    background: #f8f9fa;
    border-radius: 12px;
    border: 2px dashed #ddd;
    transition: opacity 0.3s ease;
}

.intern-card.lazy-load {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.intern-card.lazy-load.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.filtering-active {
    pointer-events: none;
}

.filtering-active .intern-grid {
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
    .filter-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-controls {
        justify-content: center;
    }
    
    .search-container {
        min-width: 100%;
        max-width: 100%;
    }
    
    .clear-filters-btn {
        align-self: center;
    }
    
    .intern-card {
        transition: none;
    }
    
    .intern-card:hover {
        transform: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .intern-card.lazy-load {
        transition: opacity 0.3s ease;
        transform: none;
    }
}