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

/* CSS Custom Properties for consistent spacing and colors */
:root {
    /* 8px base unit spacing scale */
    --spacing-xs: 0.25rem;    /* 4px */
    --spacing-sm: 0.5rem;     /* 8px */
    --spacing-md: 1rem;       /* 16px */
    --spacing-lg: 1.5rem;     /* 24px */
    --spacing-xl: 2rem;       /* 32px */
    --spacing-xxl: 3rem;      /* 48px */
    
    --color-primary-light: #f0f8ff;
    --color-primary: #4a90c2;
    --color-primary-dark: #357abd;
    --color-accent-teal: #20b2aa;
    --color-accent-purple: #9966cc;
    --color-text-primary: #333333;
    --color-text-secondary: #666666;
    --color-bg-white: #ffffff;
    --color-bg-light: #fafafa;
    --color-bg-lighter: #f5f5f5;
    --color-border: #e6f3ff;
    --color-border-light: #f5f5f5;
    
    --header-height: 60px;
    --sidebar-width: 250px;
    --border-radius: 6px;
    --box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Source Code Pro', monospace;
}

html {
    font-size: 16px;
    line-height: 1.6;
    scroll-behavior: smooth;
}

body {
    /* System font stack for optimal performance */
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--color-bg-white);
    color: var(--color-text-primary);
    min-height: 100vh;
    /* Comfortable reading line height */
    line-height: 1.6;
    font-weight: 400;
    /* Improved text rendering */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Main App Layout using CSS Grid */
#app {
    min-height: 100vh;
    display: grid;
    grid-template-rows: var(--header-height) 1fr auto;
    grid-template-areas: 
        "header"
        "content"
        "footer";
}

/* Header */
.app-header {
    grid-area: header;
    background: var(--color-bg-white);
    border-bottom: 2px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--box-shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 100%;
}

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

.app-header h1 {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--color-text-primary);
    margin: 0;
    text-transform: uppercase;
    text-shadow: 2px 2px 0px var(--color-accent-teal);
    letter-spacing: 1px;
}

.breadcrumb {
    display: flex;
    align-items: center;
}

.breadcrumb-btn {
    background: transparent;
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.header-nav {
    display: flex;
    gap: var(--spacing-sm);
}

.header-right {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.keyboard-hint {
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.keyboard-hint:hover {
    opacity: 1;
}

/* Main App Layout Container */
.app-layout {
    grid-area: content;
    display: block;
    min-height: 0; /* Allow grid items to shrink */
}

/* Sidebar */
.sidebar {
    grid-area: sidebar;
    background-color: var(--color-bg-light);
    border-right: 1px solid var(--color-border-light);
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.sidebar-section {
    margin-bottom: var(--spacing-xl);
}

.sidebar-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

/* Stats Section */
.stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.stat-number {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* Main Content Area */
.main-content {
    padding: var(--spacing-xl);
    overflow-y: auto;
    background-color: var(--color-bg-white);
    position: relative;
    max-width: 1400px;
    margin: 0 auto;
}

/* Section Transitions */
.section-container {
    transition: all 0.3s ease;
}

.section-container.transitioning-out {
    opacity: 0.5;
    transform: translateX(-20px);
}

.section-container.transitioning-in {
    opacity: 0.8;
    transform: translateX(10px);
}

.content-section {
    max-width: 800px;
}

.content-section#dashboard-section {
    max-width: 1200px;
    margin: 0 auto;
}

.content-section.hidden {
    display: none;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.header-count {
    font-size: 0.875rem;
    font-weight: normal;
    color: var(--color-text-secondary);
    margin-left: 0.5rem;
}

.section-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Empty State */
.empty-state {
    text-align: center;
    color: var(--color-text-secondary);
    font-style: italic;
    padding: var(--spacing-xl);
    background-color: var(--color-bg-lighter);
    border-radius: var(--border-radius);
    margin: var(--spacing-lg) 0;
}

/* Footer */
.app-footer {
    grid-area: footer;
    background-color: var(--color-bg-light);
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    border-top: 1px solid var(--color-border-light);
}

/* Responsive Design */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 200px;
    }
    
    .header-content {
        padding: 0 var(--spacing-md);
    }
    
    .main-content {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    .app-layout {
        grid-template-columns: 1fr;
        grid-template-areas: 
            "main"
            "sidebar";
    }
    
    :root {
        --header-height: auto;
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }
    
    .header-left {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .header-nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .header-right {
        text-align: center;
    }
    
    .keyboard-hint {
        display: none; /* Hide keyboard hints on mobile */
    }
    
    .sidebar {
        order: 2;
        border-right: none;
        border-top: 1px solid var(--color-border-light);
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .section-actions {
        width: 100%;
        justify-content: flex-start;
    }
    
    .section-container {
        max-width: 100%;
    }
}

/* Version Footer */
.version-footer {
    position: fixed;
    bottom: 0;
    right: 0;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.9);
    border-top: 1px solid var(--color-border);
    border-left: 1px solid var(--color-border);
    border-top-left-radius: 8px;
    font-size: 12px;
    color: var(--color-text-secondary);
    z-index: 100;
    backdrop-filter: blur(10px);
}

.version-footer span {
    opacity: 0.7;
    transition: opacity 0.2s;
}

.version-footer:hover span {
    opacity: 1;
}

/* Refresh Progress Styles */
.refresh-progress {
    background: #f8f9fa;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.progress-header h3 {
    margin: 0;
    color: #333;
    font-size: 18px;
}

.progress-count {
    font-size: 16px;
    font-weight: 600;
    color: #007bff;
}

.progress-bar {
    width: 100%;
    height: 24px;
    background: #e9ecef;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #007bff 0%, #0056b3 100%);
    transition: width 0.3s ease;
    border-radius: 12px;
}

.progress-current {
    margin-bottom: 15px;
    padding: 10px;
    background: #fff;
    border-radius: 6px;
    border: 1px solid #e0e0e0;
}

.progress-label {
    color: #666;
    margin-right: 8px;
}

.progress-feed-name {
    font-weight: 600;
    color: #333;
}

.progress-feed-date {
    font-size: 12px;
    color: #777;
    margin-left: 8px;
}

.progress-article {
    margin-top: 8px;
    font-size: 14px;
}

.progress-translation {
    margin-top: 8px;
    padding: 8px;
    background: #e8f4fd;
    border-radius: 4px;
    font-size: 14px;
}

.progress-translation-status {
    color: #0066cc;
    font-style: italic;
}

.progress-article-name {
    font-style: italic;
    color: #555;
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}

.progress-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
    margin-bottom: 15px;
}

.progress-stat {
    background: #fff;
    padding: 10px;
    border-radius: 6px;
    border: 1px solid #e0e0e0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stat-label {
    color: #666;
    font-size: 14px;
}

.stat-value {
    font-weight: 600;
    color: #333;
    font-size: 16px;
}

.progress-details {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    background: #fff;
}

.progress-detail-item {
    padding: 8px 12px;
    border-bottom: 1px solid #f0f0f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.progress-detail-item:last-child {
    border-bottom: none;
}

.progress-detail-item.success {
    background: #f0fff4;
}

.progress-detail-item.error {
    background: #fff5f5;
}

.detail-name {
    font-weight: 500;
    color: #333;
}

.detail-status {
    font-size: 14px;
    color: #28a745;
}

.detail-status.error {
    color: #dc3545;
}