/* General Styles */
body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

:root {
    --light-bg: #FFFFFF;
    --light-surface: #F8F9FA;
    --light-text-primary: #212529;
    --light-text-secondary: #6C757D;
    --dark-bg: #121212;
    --dark-surface: #1E1E1E;
    --dark-text-primary: #E9ECEF;
    --dark-text-secondary: #ADB5BD;
    --accent-color: #0D6EFD;
}

body.light-theme {
    background-color: var(--light-bg);
    color: var(--light-text-primary);
}

body.dark-theme {
    background-color: var(--dark-bg);
    color: var(--dark-text-primary);
}

/* Layout */
.main-container {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 250px;
    flex-shrink: 0;
    padding: 1rem;
    border-right: 1px solid #dee2e6;
}

body.light-theme .sidebar {
    background-color: var(--light-surface);
    border-right: 1px solid #dee2e6;
}

body.dark-theme .sidebar {
    background-color: var(--dark-surface);
    border-right: 1px solid #343a40;
}

.main-content {
    flex-grow: 1;
    padding: 1rem;
    overflow-y: auto;
}

/* Sidebar */
.sidebar h4 {
    font-size: 1.1rem;
    font-weight: 600;
}

.sidebar .nav-link {
    color: var(--light-text-secondary);
}

body.dark-theme .sidebar .nav-link {
    color: var(--dark-text-secondary);
}

.sidebar .nav-link.active,
.sidebar .nav-link:hover {
    color: var(--accent-color);
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

/* Search Bar */
.search-bar {
    flex-grow: 1;
    margin-right: 1rem;
}

/* Gallery */
.photo-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 0.25rem;
    transition: transform 0.2s;
}

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

/* Theme switcher */
.theme-switcher {
    cursor: pointer;
}