/* 
 * Personal Website Styles
 * Michal Lindner
 */

/* === CSS Variables === */
:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --text-color: #1e293b;
    --text-light: #64748b;
    --bg-color: #ffffff;
    --bg-secondary: #f8fafc;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    font-size: 16px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    opacity: 0.8;
}

/* === Layout === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* === Header & Navigation === */
.site-header {
    background: var(--bg-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    margin: 3px 0;
    transition: var(--transition);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

/* === Hero Section === */
.hero {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-color) 100%);
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.lead {
    font-size: 1.25rem;
    color: var(--text-light);
}

/* === Feature Cards === */
.features {
    padding: 3rem 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: #1d4ed8;
    opacity: 1;
}

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

.btn-secondary:hover {
    background: #475569;
    opacity: 1;
}

/* === Page Header === */
.page-header {
    padding: 2rem 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.page-header h1 {
    font-size: 2rem;
}

/* === Photo Grid === */
.photo-grid,
.photo-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.photo-item,
.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    aspect-ratio: 1;
}

.photo-item:hover,
.gallery-item:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-lg);
}

.photo-item img,
.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.photo-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
    color: white;
    padding: 1rem;
    opacity: 0;
    transition: var(--transition);
}

.photo-item:hover .photo-overlay {
    opacity: 1;
}

/* === Folder Grid === */
.folder-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.folder-card {
    background: var(--bg-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.folder-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.folder-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.folder-placeholder {
    width: 100%;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    background: var(--bg-secondary);
}

.folder-info {
    padding: 1.5rem;
}

.folder-info h3 {
    margin-bottom: 0.5rem;
}

.folder-info p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* === Lightbox === */
.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    z-index: 9999;
    animation: fadeIn 0.3s ease;
}

.lightbox.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.lightbox-content img {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
    position: absolute;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.5);
    border-radius: var(--border-radius);
    transition: var(--transition);
    user-select: none;
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
    background: rgba(0, 0, 0, 0.8);
}

.lightbox-close {
    top: 20px;
    right: 20px;
}

.lightbox-prev {
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
}

.lightbox-next {
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}

.lightbox-caption {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: white;
    background: rgba(0, 0, 0, 0.7);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
}

.lightbox-counter {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: white;
    background: rgba(0, 0, 0, 0.7);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
}

/* === Articles === */
.articles-filter {
    display: flex;
    gap: 1rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    border: 2px solid var(--border-color);
    background: var(--bg-color);
    color: var(--text-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.articles-list {
    display: grid;
    gap: 2rem;
    margin: 2rem 0;
}

.article-card {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.article-card:hover {
    box-shadow: var(--shadow-lg);
}

.article-card.hidden {
    display: none;
}

.article-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.article-type {
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
}

.article-type.article {
    background: #dbeafe;
    color: #1e40af;
}

.article-type.review {
    background: #fce7f3;
    color: #9f1239;
}

.article-type.blog {
    background: #dcfce7;
    color: #166534;
}

.article-date {
    color: var(--text-light);
    font-size: 0.9rem;
}

.article-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.article-title a {
    color: var(--text-color);
}

.article-title a:hover {
    color: var(--primary-color);
}

.article-description {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.article-publisher {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.article-link {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 600;
}

.article-link:hover {
    text-decoration: underline;
}

.no-articles {
    text-align: center;
    padding: 3rem;
    color: var(--text-light);
}

/* === About Page === */
.about-content {
    max-width: 800px;
    margin: 2rem auto;
}

.about-section {
    margin-bottom: 3rem;
}

.about-section h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.about-section p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.contact-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* === Recent Content === */
.recent-content {
    padding: 3rem 0;
    border-top: 2px solid var(--border-color);
}

.recent-content h2 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
}

/* === Footer === */
.site-footer {
    background: var(--bg-secondary);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-light);
}

.footer-section a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.9rem;
}

/* === Animations === */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* === Responsive Design === */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-color);
        padding: 1rem;
        box-shadow: var(--shadow-md);
        display: none;
        gap: 0;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-menu a {
        display: block;
        padding: 1rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .photo-grid,
    .photo-gallery {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
    }
    
    .folder-grid {
        grid-template-columns: 1fr;
    }
    
    .lightbox-prev,
    .lightbox-next {
        font-size: 1.5rem;
        padding: 0.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero h1 {
        font-size: 1.5rem;
    }
    
    .lead {
        font-size: 1rem;
    }
    
    .photo-grid,
    .photo-gallery {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}