/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --accent: #4a9eff;
    --hover-overlay: rgba(255, 255, 255, 0.1);
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
    background-color: var(--bg-secondary);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}

.album-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-top: 0.5rem;
}

nav {
    margin-bottom: var(--spacing-md);
}

.back-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 1rem;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--text-primary);
}

/* Main Content */
main {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-md);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Albums Grid (Home Page) */
.albums-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.album-card {
    position: relative;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

.album-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.album-cover {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
}

.album-cover.placeholder {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.3);
}

.album-info {
    padding: var(--spacing-md);
}

.album-info h2 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
}

.album-info p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.album-photo-count {
    color: var(--accent);
    font-size: 0.85rem;
    margin-top: 0.5rem;
    display: inline-block;
}

/* Photo Grid (Album Page) */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: var(--spacing-md);
}

.photo-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    cursor: pointer;
    aspect-ratio: 1;
    background-color: var(--bg-secondary);
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: var(--transition);
    opacity: 0;
}

.photo-item img.loaded {
    opacity: 1;
}

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

.photo-item::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0);
    transition: var(--transition);
    pointer-events: none;
}

.photo-item:hover::after {
    background-color: var(--hover-overlay);
}

/* Loading Spinner */
.photo-item::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 30px;
    height: 30px;
    margin: -15px 0 0 -15px;
    border: 3px solid var(--bg-secondary);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    z-index: 10;
}

.photo-item.loaded::before {
    content: none;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Footer */
footer {
    text-align: center;
    padding: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
    background-color: var(--bg-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .albums-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: var(--spacing-sm);
    }

    .photo-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 0.5rem;
    }

    main {
        padding: var(--spacing-md) var(--spacing-sm);
    }
}

@media (min-width: 1200px) {
    .photo-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

/* PhotoSwipe Customization */
.pswp__bg {
    background-color: rgba(0, 0, 0, 0.95);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-secondary);
}

.empty-state h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.empty-state p {
    font-size: 1rem;
    line-height: 1.8;
}

/* Lock Badge for Private Albums */
.lock-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.5rem;
    border-radius: 50%;
    font-size: 1.2rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    backdrop-filter: blur(5px);
}

/* Password Modal */
.modal {
    display: block;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0);
    transition: background-color 0.3s ease;
    opacity: 0;
}

.modal.show {
    background-color: rgba(0, 0, 0, 0.8);
    opacity: 1;
}

.modal-content {
    background-color: var(--bg-secondary);
    margin: 10% auto;
    padding: var(--spacing-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    position: relative;
    transform: translateY(-50px);
    transition: transform 0.3s ease;
}

.modal.show .modal-content {
    transform: translateY(0);
}

.modal-close {
    color: var(--text-secondary);
    float: right;
    font-size: 2rem;
    font-weight: 300;
    line-height: 1;
    cursor: pointer;
    transition: var(--transition);
}

.modal-close:hover,
.modal-close:focus {
    color: var(--text-primary);
}

.modal-content h2 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: 1.8rem;
    font-weight: 400;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.modal-content .lock-icon {
    font-size: 1.5rem;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.modal-content form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.modal-content input[type="password"] {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    background-color: var(--bg-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: calc(var(--border-radius) / 2);
    color: var(--text-primary);
    transition: var(--transition);
}

.modal-content input[type="password"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(74, 158, 255, 0.2);
}

.error-message {
    color: #ff6b6b;
    font-size: 0.9rem;
    min-height: 1.5rem;
    margin: -0.5rem 0;
}

.button-group {
    display: flex;
    gap: var(--spacing-sm);
}

.modal-content button {
    flex: 1;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border: none;
    border-radius: calc(var(--border-radius) / 2);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.btn-primary {
    background-color: var(--accent);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: #3a8eef;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 158, 255, 0.3);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

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

@media (max-width: 768px) {
    .modal-content {
        margin: 20% auto;
        padding: var(--spacing-md);
    }

    .button-group {
        flex-direction: column;
    }

    .modal-content button {
        width: 100%;
    }
}