/* Color System - Dynamic hue based on day of the year */
:root {
    /* Calculate hue based on day 199 of the year (current reference) */
    --day-of-year: 199;
    --base-hue: calc(var(--day-of-year) * 360 / 365);
    
    /* Primary color variations using calculated hue */
    --primary-50: hsl(var(--base-hue), 25%, 95%);
    --primary-100: hsl(var(--base-hue), 30%, 85%);
    --primary-200: hsl(var(--base-hue), 35%, 75%);
    --primary-300: hsl(var(--base-hue), 40%, 65%);
    --primary-400: hsl(var(--base-hue), 45%, 55%);
    --primary-500: hsl(var(--base-hue), 50%, 45%);
    --primary-600: hsl(var(--base-hue), 55%, 35%);
    --primary-700: hsl(var(--base-hue), 60%, 25%);
    --primary-800: hsl(var(--base-hue), 65%, 15%);
    --primary-900: hsl(var(--base-hue), 70%, 10%);
    
    /* Background colors */
    --bg-primary: hsl(var(--base-hue), 20%, 8%);
    --bg-secondary: hsl(var(--base-hue), 15%, 12%);
    --bg-tertiary: hsl(var(--base-hue), 10%, 16%);
    --bg-elevated: hsl(var(--base-hue), 8%, 20%);
    
    /* Text colors */
    --text-primary: hsl(var(--base-hue), 5%, 95%);
    --text-secondary: hsl(var(--base-hue), 8%, 75%);
    --text-muted: hsl(var(--base-hue), 10%, 55%);
    
    /* Accent colors */
    --accent-primary: hsl(var(--base-hue), 60%, 50%);
    --accent-secondary: hsl(calc(var(--base-hue) + 30), 55%, 45%);
    --accent-success: hsl(120, 50%, 45%);
    --accent-warning: hsl(45, 80%, 55%);
    --accent-error: hsl(0, 60%, 50%);
    
    /* Border colors */
    --border-primary: hsl(var(--base-hue), 15%, 25%);
    --border-secondary: hsl(var(--base-hue), 10%, 30%);
    --border-accent: var(--accent-primary);
    
    /* Shadow colors */
    --shadow-sm: 0 1px 2px hsla(var(--base-hue), 20%, 0%, 0.1);
    --shadow-md: 0 4px 8px hsla(var(--base-hue), 20%, 0%, 0.15);
    --shadow-lg: 0 8px 16px hsla(var(--base-hue), 20%, 0%, 0.2);
    --shadow-xl: 0 16px 32px hsla(var(--base-hue), 20%, 0%, 0.25);
}

/* Consistent Scrollbar Styling */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--accent-primary) var(--bg-secondary);
}

*::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

*::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

*::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
    border: 1px solid var(--bg-secondary);
    transition: background-color 0.3s ease;
}

*::-webkit-scrollbar-thumb:hover {
    background: var(--primary-400);
}

*::-webkit-scrollbar-thumb:active {
    background: var(--primary-600);
}

*::-webkit-scrollbar-corner {
    background: var(--bg-secondary);
}

/* Modal and overlay scrollbars */
.modal-iframe-container::-webkit-scrollbar,
.modal-content::-webkit-scrollbar {
    width: 10px;
}

.modal-iframe-container::-webkit-scrollbar-thumb,
.modal-content::-webkit-scrollbar-thumb {
    background: var(--primary-500);
    border: 2px solid var(--bg-elevated);
}

.modal-iframe-container::-webkit-scrollbar-thumb:hover,
.modal-content::-webkit-scrollbar-thumb:hover {
    background: var(--primary-400);
}

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

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

.container {
    max-width: 100%;
    margin: 0;
    padding: 0 2rem;
}

/* Header Styles */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

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

.header-content {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    text-decoration: none;
}

.logo i {
    font-size: 2rem;
    filter: drop-shadow(0 0 8px var(--accent-primary));
}

.nav {
    display: flex;
    gap: 1rem;
}

.nav-btn,
.back-btn {
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn:hover,
.back-btn:hover {
    background: var(--accent-primary);
    color: var(--text-primary);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

/* Main Content */
.main {
    padding: 2rem 0;
    min-height: calc(100vh - 120px);
}

/* News Section */
.news-section {
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 2rem;
}

/* News Sources */
.news-sources {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.source-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.source-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.source-card:hover {
    background: var(--bg-elevated);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.source-card:hover::before {
    opacity: 1;
}

.source-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.source-icon {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--accent-primary);
}

.source-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.source-status {
    font-size: 0.9rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-success);
    animation: pulse 2s infinite;
}

.status-indicator.loading {
    background: var(--accent-warning);
}

.status-indicator.error {
    background: var(--accent-error);
    animation: none;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* News Grid */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.news-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
    position: relative;
    height: 400px;
    display: flex;
    flex-direction: column;
}

.news-card:hover {
    background: var(--bg-elevated);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.news-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.news-card:hover::before {
    opacity: 1;
}

.news-thumbnail {
    width: 100%;
    height: 180px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.news-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.news-thumbnail .placeholder-icon {
    font-size: 3rem;
    color: var(--text-muted);
    opacity: 0.5;
}

.news-card-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

.news-card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.news-source-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--accent-primary);
    flex-shrink: 0;
}

.news-card-meta {
    flex: 1;
}

.news-card-source {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 0.25rem;
}

.news-card-time {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.news-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-title a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

.news-card-title a:hover {
    color: var(--accent-primary);
}

.news-card-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: all 0.3s ease;
}

.news-card:hover .news-card-description {
    -webkit-line-clamp: none;
    line-clamp: none;
    overflow: visible;
    display: block;
}

/* Loading Cards */
.news-card.loading {
    pointer-events: none;
}

.news-card.loading .news-thumbnail {
    background: linear-gradient(90deg, var(--bg-tertiary), var(--bg-elevated), var(--bg-tertiary));
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.news-card.loading .news-card-title,
.news-card.loading .news-card-description,
.news-card.loading .news-card-source {
    background: linear-gradient(90deg, var(--bg-tertiary), var(--bg-elevated), var(--bg-tertiary));
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
    color: transparent;
}

.news-card.loading .news-card-title {
    height: 1.4em;
    margin-bottom: 0.75rem;
}

.news-card.loading .news-card-description {
    height: 4.5em;
}

.news-card.loading .news-card-source {
    height: 1em;
    width: 60%;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* Loading States */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    color: var(--text-muted);
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-primary);
    border-top: 3px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Error States */
.error {
    background: hsla(0, 60%, 50%, 0.1);
    border: 1px solid var(--accent-error);
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
    color: var(--accent-error);
    text-align: center;
}

/* Refresh Button */
.refresh-btn {
    background: var(--accent-primary);
    color: var(--text-primary);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 2rem auto;
}

.refresh-btn:hover {
    background: var(--primary-600);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.refresh-btn:active {
    transform: translateY(0);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: 2rem 0;
    text-align: center;
    color: var(--text-muted);
    margin-top: 3rem;
}

.settings-section {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.settings-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.settings-select {
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 140px;
}

.settings-select:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
}

.settings-select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px hsla(var(--base-hue), 60%, 50%, 0.2);
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .news-card {
        height: auto;
        min-height: 350px;
    }
    
    .settings-section {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
.nav-btn:focus,
.back-btn:focus,
.refresh-btn:focus,
.news-title a:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Article Modal */
.article-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: hsla(var(--base-hue), 20%, 0%, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

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

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 16px;
    width: 100%;
    max-width: 1200px;
    height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    position: relative;
}

.modal-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-tertiary);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    flex: 1;
    margin-right: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.modal-actions {
    display: flex;
    gap: 0.75rem;
}

.modal-btn {
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.modal-btn:hover {
    background: var(--accent-primary);
    color: var(--text-primary);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.modal-btn.close-btn:hover {
    background: var(--accent-error);
    border-color: var(--accent-error);
}

.modal-btn.share-btn {
    background: var(--accent-secondary);
    border-color: var(--accent-secondary);
}

.modal-btn.share-btn:hover {
    background: var(--primary-600);
    border-color: var(--primary-600);
    transform: translateY(-1px);
}

.modal-iframe-container {
    flex: 1;
    position: relative;
    background: var(--bg-primary);
}

.modal-iframe {
    width: 100%;
    height: 100%;
    border: none;
    background: var(--bg-primary);
}

.modal-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
    z-index: 1001;
}

.modal-loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-primary);
    border-top: 4px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Modal Responsive */
@media (max-width: 768px) {
    .article-modal {
        padding: 1rem;
    }
    
    .modal-content {
        height: 95vh;
        border-radius: 12px;
    }
    
    .modal-header {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .modal-title {
        margin-right: 0;
        text-align: center;
    }
    
    .modal-actions {
        justify-content: center;
    }
}

/* Clickable news cards */
.news-card {
    cursor: pointer;
}

.news-card:hover {
    background: var(--bg-elevated);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.news-card-title a {
    pointer-events: none;
}