:root {
    --black: #111111;
    --white: #ffffff;
    --gray-light: #f5f5f5;
    --gray-medium: #e0e0e0;
    --gray-dark: #333333;
    --green-primary: #2ecc71;
    --green-dark: #27ae60;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-hover: 0 14px 28px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--black);
    background-color: var(--white);
    scroll-behavior: smooth;
}

/* Main container */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Page title */
.page-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--black);
    position: relative;
    font-weight: 600;
}

.page-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--green-primary);
}

/* Albums grid */
.albums-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.album-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-medium);
}

.album-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--green-primary);
}

.album-cover {
    width: 100%;
    height: 220px;
    object-fit: cover;
    display: block;
}

.album-info {
    padding: 1.5rem;
}

.album-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--black);
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    text-wrap: nowrap;
}

.view-album-btn {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background-color: var(--white);
    color: var(--green-primary);
    border: 2px solid var(--green-primary);
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    margin-top: 1rem;
}

.view-album-btn:hover {
    background-color: var(--green-primary);
    color: var(--white);
}

/* Album page */
.back-link {
    display: inline-flex;
    align-items: center;
    color: var(--green-primary);
    text-decoration: none;
    margin-bottom: 2rem;
    font-weight: 500;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--green-dark);
}

.album-header {
    margin-bottom: 3rem;
    text-align: center;
}

.album-header h1 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
    color: var(--black);
}

.album-description {
    color: var(--gray-dark);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Advanced photo grid */
.photos-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.photo-item {
    position: relative;
    border-radius: 4px;
    overflow: hidden;
    transition: var(--transition);
    animation: fadeIn 0.5s ease forwards;
    opacity: 0;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.photo-thumbnail {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    cursor: zoom-in;
    transition: var(--transition);
    background-color: var(--gray-light);
}

.photo-thumbnail:hover {
    transform: scale(1.02);
}

/* Scroll to top button */
.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background-color: var(--green-primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background-color: var(--green-dark);
    transform: translateY(-3px);
}

/* Photo viewer modal */
.photo-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.photo-modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
}

.modal-img {
    max-width: 100%;
    max-height: 80vh;
    display: block;
    margin: 0 auto;
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 20px;
    color: var(--white);
    font-size: 2rem;
    cursor: pointer;
    background: none;
    border: none;
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--green-primary);
}

.nav-buttons {
    position: absolute;
    top: 50%;
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    transform: translateY(-50%);
    z-index: 100;
}

.nav-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.5rem;
    backdrop-filter: blur(5px);
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    .photos-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .main-container {
        padding: 1.5rem;
    }

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

    .page-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .photos-grid {
        grid-template-columns: 1fr;
    }

    .album-cover {
        height: 180px;
    }

    .scroll-top {
        width: 40px;
        height: 40px;
        bottom: 1rem;
        right: 1rem;
    }
}