:root {
    --primary-color: #0071e3;
    --background-color: #000;
    --text-color: #fff;
    --card-background: #1c1c1e;
    --card-hover: #2c2c2e;
    --accent-color: #5e5ce6;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s ease;
}

header {
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.wallpaper-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
}

.wallpaper-item {
    background-color: var(--card-background);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.wallpaper-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.wallpaper-img-container {
    position: relative;
    width: 100%;
    padding-top: 216.74%; /* 2796/1290 = 2.1674 */
    overflow: hidden;
}

.wallpaper-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.wallpaper-item:hover .wallpaper-img {
    transform: scale(1.05);
}

.wallpaper-info {
    padding: 1rem;
}

.wallpaper-title {
    margin: 0 0 0.5rem 0;
    font-size: 1rem;
    font-weight: 500;
}

.download-buttons {
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
}

.download-btn {
    flex: 1;
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
    font-weight: 500;
    font-size: 0.8rem;
    text-align: center;
}

.download-btn:hover {
    background-color: var(--primary-color);
    color: var(--text-color);
}

#themeToggle, #filterToggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

#themeToggle:hover, #filterToggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.filter-container {
    display: none;
    margin-bottom: 1rem;
    padding: 1rem;
    background-color: var(--card-background);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.filter-container.active {
    display: block;
}

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

.filter-option {
    background-color: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
    font-size: 0.8rem;
}

.filter-option.active, .filter-option:hover {
    background-color: var(--accent-color);
    color: var(--text-color);
}

@media (max-width: 768px) {
    .wallpaper-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
}

.light-mode {
    --background-color: #f5f5f7;
    --text-color: #1d1d1f;
    --card-background: #fff;
    --card-hover: #f0f0f0;
}

.search-container {
    display: flex;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 0.3rem 1rem;
    margin: 1rem 0;
}

.search-container input {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1rem;
    width: 100%;
    padding: 0.5rem;
    outline: none;
}

.search-container input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}