:root {
    --bg-primary: #f9fafc;
    --bg-secondary: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #444;
    --accent-primary: #0d0df8;
    --accent-secondary: #6c63ff;
    --shadow-light: rgba(0, 0, 0, 0.06);
    --shadow-medium: rgba(0, 0, 0, 0.08);
    --shadow-accent: rgba(13, 13, 248, 0.25);
    --border-color: #e1e5e9;
}

[data-theme="dark"] {
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --text-primary: #e8e8e8;
    --text-secondary: #b0b0b0;
    --accent-primary: #4f46e5;
    --accent-secondary: #7c3aed;
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.4);
    --shadow-accent: rgba(79, 70, 229, 0.3);
    --border-color: #2d2d44;
}

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

body {
    font-family: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    padding: 20px;
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.header {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 30px;
    padding: 0 10px;
    position: relative;
}

.theme-toggle {
    background: none;
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    color: var(--accent-primary);
    position: absolute;
    right: 10px;
    overflow: hidden;
}

.theme-toggle:hover {
    background-color: var(--accent-primary);
    color: var(--bg-secondary);
    transform: scale(1.05);
}

.theme-toggle:focus {
    outline: 3px solid var(--shadow-accent);
    outline-offset: 2px;
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
    transition: all 0.3s ease;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

[data-theme="dark"] .theme-toggle .sun-icon {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(90deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle .moon-icon {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0deg) scale(1);
}

[data-theme="light"] .theme-toggle .sun-icon {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0deg) scale(1);
}

[data-theme="light"] .theme-toggle .moon-icon {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(-90deg) scale(0.5);
}

h1 {
    text-align: center;
    font-size: clamp(2rem, 5vw, 3rem); 
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 0;
    letter-spacing: 1px;
    transition: color 0.3s ease;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 40px;
}

.category-buttons button {
    padding: 12px 24px;
    border: none;
    border-radius: 30px;
    background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
    color: var(--bg-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.03s ease-in-out; 
    box-shadow: 0 4px 14px var(--shadow-accent);
}

.category-buttons button:hover {
    background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
    transform: translateY(-10px) scale(1.03) !important; 
    box-shadow: 0 12px 24px var(--shadow-accent); 
}

.category-buttons button:focus {
    outline: 3px solid var(--shadow-accent);
    outline-offset: 2px;
}

.search-bar input {
    padding: 12px 20px;
    width: 100%; 
    max-width: 320px;
    border: none; 
    border-radius: 30px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    box-shadow: 0 4px 10px var(--shadow-medium);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.search-bar input:focus {
    outline: none;
    box-shadow: 0 0 0 4px var(--shadow-accent);
}

.gallery {
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 20px;
    justify-content: center;
    align-items: start;
}

.gallery-item {
    background: var(--bg-secondary);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 6px 16px var(--shadow-light);
    border: 1px solid var(--border-color);
}

.gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px var(--shadow-light);
    border-color: var(--accent-primary);
}

.gallery-item img {
    width: 100%;
    height: 320px;
    object-fit: cover;
    display: block;
}

.gallery-item p {
    padding: 12px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    text-align: center;
    transition: color 0.3s ease;
}

.pagination {
    margin-top: 40px;
    text-align: center;
}

.pagination button {
    padding: 10px 18px;
    margin: 0 6px;
    border: none;
    border-radius: 50px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.pagination button:hover {
    background-color: var(--accent-primary);
    color: var(--bg-secondary);
    border-color: var(--accent-primary);

}

.pagination button.active {
    background-color: var(--accent-primary);
    color: var(--bg-secondary);
    border-color: var(--accent-primary);
}

.pagination button:focus {
    outline: 3px solid var(--shadow-accent); 
    outline-offset: 2px;
}