:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    --accent-color: #3b82f6;
    --card-hover: #f1f5f9;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --border-color: #334155;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    --accent-color: #60a5fa;
    --card-hover: #334155;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    padding-bottom: 4rem;
    min-height: 100vh;
}

header {
    background-color: var(--bg-secondary);
    box-shadow: var(--shadow);
    padding: 1.5rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: var(--transition);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(90deg, var(--accent-color), #8b5cf6);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo svg {
    width: 28px;
    height: 28px;
}

.controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.search-container {
    position: relative;
}

#search {
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    width: 280px;
    transition: var(--transition);
}

#search:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.search-icon {
    position: absolute;
    left: 0.8rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.filters {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.6rem 1.2rem;
    border: none;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.filter-btn:hover, .filter-btn.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition);
}

.theme-toggle:hover {
    background-color: var(--card-hover);
    color: var(--accent-color);
}

.stats {
    display: flex;
    gap: 2rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

main {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

.gallery-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-title svg {
    width: 24px;
    height: 24px;
    color: var(--accent-color);
}

.load-more-container {
    position: sticky;
    bottom: 2rem;
    text-align: center;
    padding-bottom: 1rem;
    z-index: 50;
}

#load-more {
    background-image: linear-gradient(to right, #4f46e5, #8b5cf6);
    color: white;
    border: none;
    padding: 0.8rem 1.8rem;
    border-radius: 999px; /* Make it a pill shape */
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

#load-more:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
    background-image: linear-gradient(to right, #4338ca, #7c3aed);
}

#load-more:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
    background-image: none; /* remove gradient when disabled */
    background-color: var(--text-secondary);
}

.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.5rem;
}

.card {
    background-color: var(--bg-secondary);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    border-color: var(--accent-color);
}

.icon-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 140px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-bottom: 1px solid var(--border-color);
}

[data-theme="dark"] .icon-container {
    background: linear-gradient(135deg, #1f2937 0%, #374151 100%);
}

.icon-placeholder {
    font-size: 0.75rem;
    text-align: center;
    color: var(--text-secondary);
    padding: 0.5rem;
}

.card-content {
    padding: 1.25rem;
}

.icon-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
    word-break: break-word;
    font-size: 0.9em;
}

.icon-type {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.type-png {
    background-color: #dbeafe;
    color: #1e40af;
}

[data-theme="dark"] .type-png {
    background-color: #1e40af;
    color: #dbeafe;
}

.type-svg {
    background-color: #dcfce7;
    color: #166534;
}

[data-theme="dark"] .type-svg {
    background-color: #166534;
    color: #dcfce7;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state svg {
    width: 80px;
    height: 80px;
    margin-bottom: 1.5rem;
    color: var(--accent-color);
    opacity: 0.7;
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    margin-top: auto;
    color: var(--text-secondary);
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    margin-top: 1rem;
    padding: 0.6rem;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.download-btn:hover {
    background-color: #2563eb;
    transform: translateY(-1px);
}

[data-theme="dark"] .download-btn:hover {
    background-color: #3b82f6;
}


@media (max-width: 768px) {
    .header-container {
        gap: 1rem;
    }
    .header-top {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    .stats {
        flex-wrap: wrap;
        gap: 1rem;
    }
    #search {
        width: 100%;
    }
    .controls {
        width: 100%;
        justify-content: space-between;
    }
    .gallery {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

@media (max-width: 480px) {
    .gallery-header {
        flex-direction: column;
        align-items: stretch;
    }
    .filters {
        width: 100%;
        overflow-x: auto;
        padding-bottom: 0.5rem;
    }
    .filter-btn {
        flex-shrink: 0;
    }
    .controls {
        flex-direction: column;
        align-items: stretch;
    }
    main {
        padding: 0 1rem;
    }
    .logo {
        font-size: 1.5rem;
    }
    .load-more-container {
        bottom: 1rem;
    }
    .section-title {
        font-size: 1.3rem;
    }
}