/* ========================================
   Vibecoding - Minimalistický accordion design
   ======================================== */

:root {
    /* Barvy */
    --color-bg: #0f172a;
    --color-bg-hover: #1e293b;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-accent: #6366f1;
    --color-accent-light: rgba(99, 102, 241, 0.1);
    --color-border: #334155;
    
    /* Spacing */
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Transitions */
    --transition: 0.3s ease;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* Loading Notification */
.loading-notification {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1000;
    background: var(--color-bg-hover);
    border: 2px solid var(--color-accent);
    border-radius: 12px;
    padding: var(--spacing-2xl);
    max-width: 90%;
    width: 500px;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 0 80px rgba(99, 102, 241, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-notification.show {
    opacity: 1;
    visibility: visible;
}

.notification-content p {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--color-text);
    margin: 0;
}

.notification-content p:first-child {
    font-weight: 500;
}

/* Header */
.site-header {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--color-border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.back-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-text-secondary);
    transition: color var(--transition);
    font-size: 0.875rem;
}

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

.back-arrow {
    font-size: 1.25rem;
    opacity: 0.7;
    transition: transform var(--transition);
}

.back-link:hover .back-arrow {
    transform: translateX(-4px);
}

.back-text {
    font-weight: 500;
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent) 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

/* Articles Container */
.articles-container {
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - 200px);
}

/* Article Item */
.article-item {
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    transition: all var(--transition);
}

.article-item:hover {
    border-color: var(--color-accent);
}

.article-item.active {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 1px var(--color-accent);
}

/* Když není JavaScript, články jsou rozbalené */
.article-item .article-content {
    max-height: none;
    overflow: visible;
}

/* Když je JavaScript aktivní, články se sbalí */
body.js-enabled .article-item .article-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
}

body.js-enabled .article-item.active .article-content {
    max-height: 5000px; /* Dostatečně velká hodnota pro obsah */
    transition: max-height 0.5s ease-in-out;
}

/* Article Header (Clickable Area) */
.article-header {
    padding: var(--spacing-xl);
    cursor: pointer;
    background: transparent;
    transition: background-color var(--transition);
}

.article-header:hover {
    background-color: var(--color-bg-hover);
}

.article-header-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.article-title {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.3;
    margin: 0;
    flex: 1;
    padding-right: var(--spacing-lg);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    white-space: nowrap;
}

.expand-icon {
    font-size: 1.5rem;
    font-weight: 300;
    transition: transform var(--transition);
    user-select: none;
    display: none; /* Skrytý dokud není JS aktivní */
}

body.js-enabled .expand-icon {
    display: block;
}

body.js-enabled .article-item.active .expand-icon {
    transform: rotate(45deg);
}

.article-summary {
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.5;
}

/* Content Inner */
.content-inner {
    padding: 0 var(--spacing-xl) var(--spacing-xl);
}

/* Content Typography */
.article-content section {
    margin-bottom: var(--spacing-2xl);
}

.article-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.article-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

/* Links in articles */
.article-content a {
    color: var(--color-accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition);
}

.article-content a:hover {
    border-bottom-color: var(--color-accent);
}

/* Lists in articles */
.article-content ul {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-xl);
    color: var(--color-text-secondary);
}

.article-content li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

.article-content strong {
    color: var(--color-text);
    font-weight: 600;
}

/* Highlights */
.highlight {
    background: var(--color-accent-light);
    color: var(--color-accent);
    padding: 2px 6px;
    border-radius: 4px;
}

/* Blockquotes */
.article-quote {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: var(--color-bg-hover);
    border-left: 3px solid var(--color-accent);
    border-radius: 4px;
}

.article-quote cite {
    display: block;
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* Placeholder článek */
.article-item.placeholder {
    opacity: 0.5;
    cursor: default;
}

.article-item.placeholder .article-header:hover {
    background: transparent;
}

.coming-soon {
    font-style: italic;
    color: var(--color-text-secondary);
}

/* Footer */
.site-footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-2xl);
}

.footer-content {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    /* Header zůstává flex, ale může se zalamovat */
    .header-content {
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }
    
    .logo {
        gap: var(--spacing-md);
        width: 100%;
        justify-content: space-between;
    }
    
    /* OPRAVA: Odkaz zpět zůstává viditelný celý! */
    .back-link {
        font-size: 0.8rem;
    }
    
    .back-text {
        /* Už NENÍ display: none - text zůstává viditelný! */
        font-weight: 500;
    }
    
    .page-title {
        font-size: 1.5rem;
    }
    
    .article-header {
        padding: var(--spacing-lg);
    }
    
    .content-inner {
        padding: 0 var(--spacing-lg) var(--spacing-lg);
    }
    
    .article-title {
        font-size: 1.25rem;
    }
    
    .article-header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .article-title {
        padding-right: 0;
    }
    
    .article-meta {
        width: 100%;
        justify-content: space-between;
    }
    
    .loading-notification {
        padding: var(--spacing-xl);
        width: calc(100% - 2rem);
    }
    
    .notification-content p {
        font-size: 1rem;
    }
}

/* Pro velmi malé obrazovky */
@media (max-width: 380px) {
    .back-text {
        font-size: 0.75rem;
    }
    
    .page-title {
        font-size: 1.25rem;
    }
}

/* Pro extrémně malé obrazovky */
@media (max-width: 320px) {
    .back-link {
        flex-direction: column;
        align-items: flex-start;
        gap: 2px;
    }
    
    .back-arrow {
        font-size: 1rem;
    }
    
    .back-text {
        font-size: 0.7rem;
        margin-left: 1.5rem;
    }
}

/* Smooth animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.article-item {
    animation: fadeIn 0.3s ease-out;
}

/* Print styles */
@media print {
    .site-header,
    .site-footer,
    .expand-icon,
    .loading-notification {
        display: none;
    }
    
    .article-item {
        border: none;
        margin-bottom: 2rem;
    }
    
    .article-content {
        max-height: none !important;
    }
}

/* ========================================
   Sekce sdílení článků
   ======================================== */

.share-section {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.share-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.share-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-bg-hover);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.share-btn svg {
    width: 1.125rem;
    height: 1.125rem;
}

/* Specifické barvy pro jednotlivé platformy */
.share-twitter:hover {
    background: #000000;
    color: white;
    border-color: #000000;
}

.share-facebook:hover {
    background: #1877f2;
    color: white;
    border-color: #1877f2;
}

.share-linkedin:hover {
    background: #0066cc;
    color: white;
    border-color: #0066cc;
}

.share-copy:hover {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

/* Feedback při kopírování */
.share-copy[data-copied="true"] {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

/* Responsive design pro sdílení */
@media (max-width: 640px) {
    .share-buttons {
        justify-content: stretch;
    }
    
    .share-btn {
        flex: 1;
        justify-content: center;
        min-width: 0;
    }
    
    .share-btn span {
        display: none; /* Skrýt text na malých obrazovkách */
    }
    
    .share-btn svg {
        width: 1.25rem;
        height: 1.25rem;
    }
}