/* CSS Variables for theming */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --background-color: #ffffff;
    --surface-color: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #0f172a;
        --surface-color: #1e293b;
        --text-primary: #f1f5f9;
        --text-secondary: #94a3b8;
        --border-color: #334155;
    }
}

/* 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-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* App container */
#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

/* Filter Container */
.filter-container {
    position: relative;
}

.source-filter {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 2rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 120px;
    max-width: 200px;
}

.source-filter:hover {
    border-color: var(--primary-color);
}

.source-filter:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.source-filter::after {
    content: '▼';
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Hide default dropdown arrow */
.source-filter::-ms-expand {
    display: none;
}

/* Mobile responsive adjustments */
@media (max-width: 640px) {
    .source-filter {
        min-width: 100px;
        max-width: 150px;
        font-size: 0.8rem;
        padding: var(--spacing-xs) var(--spacing-sm);
        padding-right: 1.5rem;
    }
    
    .header-actions {
        gap: var(--spacing-xs);
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    gap: var(--spacing-xs);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--surface-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--border-color);
}

.btn-icon {
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    background-color: transparent;
    color: var(--text-secondary);
}

.btn-icon:hover {
    background-color: var(--surface-color);
    color: var(--text-primary);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8rem;
}

/* Country Navigation */
.country-nav {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
}

.country-tabs {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    padding: 0 var(--spacing-lg);
}

.country-tab {
    flex: 1;
    padding: var(--spacing-md);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.country-tab:hover {
    color: var(--text-primary);
    background-color: var(--background-color);
}

.country-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.flag {
    font-size: 1.25rem;
}

.country-name {
    display: none;
}

@media (min-width: 640px) {
    .country-name {
        display: inline;
    }
}

/* Loading State */
.loading-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    color: var(--text-secondary);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

/* Error State */
.error-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    text-align: center;
}

.error-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.error-container h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.error-container p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* News Container */
.news-container {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    padding: var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

/* Filter Status */
.filter-status {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-status::before {
    content: '🔍';
    font-size: 1rem;
}

.clear-filter-btn {
    margin-left: auto;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    background-color: var(--border-color);
    border: none;
    color: var(--text-secondary);
}

.clear-filter-btn:hover {
    background-color: var(--text-secondary);
    color: white;
}

.articles-grid {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: 1fr;
}

@media (min-width: 640px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Article Card */
.article-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.2s ease;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.article-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.article-card:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

/* Mobile touch improvements */
@media (hover: none) and (pointer: coarse) {
    .article-card:hover {
        transform: none;
        box-shadow: var(--shadow-sm);
    }
    
    .article-card:active {
        transform: scale(0.98);
        box-shadow: var(--shadow-md);
    }
    
    /* Prevent text selection on swipe */
    .article-card {
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        -webkit-touch-callout: none;
        -webkit-tap-highlight-color: transparent;
    }
    
    /* Improve modal touch experience */
    .modal-content {
        -webkit-overflow-scrolling: touch;
    }
}

.article-image {
    width: 100%;
    height: 200px;
    background-color: var(--border-color);
    background-size: cover;
    background-position: center;
    position: relative;
}

.article-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.3));
}

.article-source-badge {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    z-index: 10;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.article-date-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    z-index: 10;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}





.article-content {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.article-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
    flex-shrink: 0;
}

.article-excerpt {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
    flex-shrink: 0;
}



/* Load More */
.load-more-container {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-2xl);
}

/* Offline Indicator */
.offline-indicator {
    position: fixed;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    background-color: #ef4444;
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-sm);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--background-color);
    border-radius: var(--radius-lg);
    max-width: 800px;
    width: 100%;
    max-height: 95vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    position: relative;
    transition: transform 0.3s ease, opacity 0.3s ease;
    touch-action: pan-y;
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    position: sticky;
    top: 0;
    background-color: var(--background-color);
    z-index: 10;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    margin: 0;
    flex: 1;
    margin-right: var(--spacing-md);
}

.modal-header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
    line-height: 1.7;
}

.modal-body h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    line-height: 1.4;
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-body p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    font-size: 1rem;
    text-align: justify;
}

.modal-body p:last-child {
    margin-bottom: 0;
}

.article-meta-modal {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.article-meta-modal .article-source {
    font-weight: 500;
    color: var(--primary-color);
}

.article-meta-modal .read-full-btn {
    margin: 0 var(--spacing-sm);
    white-space: nowrap;
}

.article-meta-modal .article-date {
    opacity: 0.8;
}

.swipe-hint {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-sm);
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
    opacity: 0.7;
}

/* Pull-to-refresh indicator */
.pull-indicator {
    position: fixed;
    top: 120px; /* Position below header and country nav */
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    z-index: 1000;
    transition: transform 0.2s ease;
    background-color: var(--background-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    opacity: 0;
    pointer-events: none;
}

.pull-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    margin-bottom: var(--spacing-xs);
    transition: transform 0.3s ease;
}

.pull-spinner.ready {
    border-top-color: var(--primary-color);
    transform: rotate(180deg);
}

.pull-spinner.spinning {
    animation: spin 1s linear infinite;
}

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

.article-image-modal {
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.article-image-modal img {
    width: 100%;
    height: auto;
    max-height: 300px;
    object-fit: cover;
    display: block;
}



/* Responsive adjustments */
@media (max-width: 640px) {
    .header-content {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .news-container {
        padding: var(--spacing-md);
    }
    
    .modal {
        padding: 0;
        align-items: stretch;
    }
    
    .modal-content {
        max-height: 100vh;
        border-radius: 0;
        margin: 0;
    }
    
    .modal-header {
        padding: var(--spacing-md);
    }
    
    .modal-title {
        font-size: 1.25rem;
        line-height: 1.3;
    }
    
    .modal-header-actions {
        gap: var(--spacing-xs);
    }
    
    .modal-header-actions .btn-sm {
        padding: 4px var(--spacing-xs);
        font-size: 0.75rem;
    }
    
    .modal-body {
        padding: var(--spacing-md);
    }
    
    .modal-body p {
        font-size: 0.95rem;
        line-height: 1.7;
        text-align: left;
    }
    
    .modal-footer {
        padding: var(--spacing-md);
    }
}

/* PWA specific styles */
@media (display-mode: standalone) {
    .header {
        padding-top: env(safe-area-inset-top);
    }
    
    body {
        padding-bottom: env(safe-area-inset-bottom);
    }
    
    .modal {
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
    }
}

/* Additional mobile improvements */
@media (max-width: 480px) {
    .articles-grid {
        gap: var(--spacing-md);
    }
    
    .article-card {
        border-radius: var(--radius-md);
        transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    
    .article-image {
        height: 160px;
    }
    
    .article-content {
        padding: var(--spacing-md);
    }
    
    .article-title {
        font-size: 1rem;
        line-height: 1.3;
    }
    
    .article-excerpt {
        font-size: 0.8rem;
        line-height: 1.4;
    }
    
    .article-source-badge,
    .article-date-badge {
        font-size: 0.7rem;
        padding: 2px var(--spacing-xs);
    }
    
    .article-image-modal img {
        max-height: 200px;
    }
    
    .article-meta-modal {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .article-meta-modal .read-full-btn {
        margin: 0;
        align-self: flex-start;
        text-align: center;
    }
}

/* Focus styles for accessibility */
.btn:focus,
.country-tab:focus,
.article-card:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

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

/* Pull-to-refresh styles for PWA compatibility */
.ptr--ptr {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    color: var(--text-secondary);
    z-index: 10;
    pointer-events: none;
    font-size: 0.875rem;
    font-weight: 500;
    text-align: center;
    height: 0;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

.ptr--box {
    position: relative;
    height: 0;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

.ptr--content {
    position: relative;
    min-height: 100vh;
    z-index: 1;
    background-color: var(--background-color);
}

.ptr--pull {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: auto;
    z-index: 10;
    text-align: center;
    height: 0;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

.ptr--text {
    margin: 0;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.ptr--icon {
    color: var(--primary-color);
    transition: transform 0.2s ease;
}

.ptr--release .ptr--icon {
    transform: rotate(180deg);
}

.ptr--refreshing .ptr--icon {
    animation: ptr--rotate 1s linear infinite;
}

@keyframes ptr--rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* PWA standalone mode adjustments for pull-to-refresh */
@media (display-mode: standalone) {
    .ptr--ptr {
        padding-top: env(safe-area-inset-top);
    }
    
    .ptr--content {
        padding-top: env(safe-area-inset-top);
    }
}