/* ============================================
   Daily Top 5 News Website - Complete CSS
   Design System by 100X Solutions
   ============================================ */

/* CSS Custom Properties - Design System */
:root {
    /* Colors */
    --bg-primary: #0F172A;
    --surface-dark: #111827;
    --card-bg: #1F2933;
    --text-primary: #FFFFFF;
    --accent-cyan: #22D3EE;
    --accent-blue: #38BDF8;
    --success-green: #22C55E;
    --muted: #9CA3AF;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --container-padding: 1rem;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    backdrop-filter: blur(5px);
}

.loading-spinner {
    text-align: center;
    color: var(--text-primary);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--muted);
    border-top: 3px solid var(--accent-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

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

.loading-spinner p {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--accent-cyan);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--surface-dark) 0%, var(--bg-primary) 100%);
    padding: var(--spacing-2xl) 0;
    border-bottom: 1px solid rgba(34, 211, 238, 0.1);
}

.header-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    text-align: center;
}

.brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.site-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.site-subtitle {
    font-size: var(--font-size-lg);
    color: var(--muted);
    font-weight: 400;
}

.viral-hook {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.hook-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.hook-subtitle {
    font-size: var(--font-size-lg);
    color: var(--accent-cyan);
    font-weight: 500;
    margin: 0;
}

.hook-tagline {
    font-size: var(--font-size-base);
    color: var(--muted);
    font-weight: 300;
    margin: 0;
}

/* Main Content */
.main {
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - 200px);
}

/* Filters Section */
.filters-section {
    background: var(--surface-dark);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(34, 211, 238, 0.1);
}

.filters-container {
    margin-bottom: var(--spacing-lg);
}

.filters-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    align-items: end;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.filter-group label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.filter-select,
.filter-input {
    background: var(--card-bg);
    border: 1px solid rgba(156, 163, 175, 0.2);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    transition: all var(--transition-normal);
}

.filter-select:focus,
.filter-input:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.1);
}

.filter-input::placeholder {
    color: var(--muted);
}

.refresh-btn {
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    height: fit-content;
    margin-top: var(--spacing-lg);
}

.refresh-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(34, 211, 238, 0.3);
}

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

.refresh-icon {
    font-size: var(--font-size-base);
    animation: none;
}

.refresh-btn.loading .refresh-icon {
    animation: spin 1s linear infinite;
}

/* Category Tabs */
.category-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}


.category-tab {
    background: var(--card-bg);
    border: 1px solid rgba(156, 163, 175, 0.2);
    color: var(--muted);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.category-tab:hover {
    border-color: var(--accent-cyan);
    color: var(--text-primary);
}

.category-tab.active {
    background: var(--accent-cyan);
    color: var(--bg-primary);
    border-color: var(--accent-cyan);
}

/* News Sections */
.news-sections {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3xl);
}

.news-section {
    background: var(--surface-dark);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(34, 211, 238, 0.1);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.section-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.news-count {
    font-size: var(--font-size-sm);
    color: var(--muted);
    background: var(--card-bg);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
}

.share-btn {
    background: var(--success-green);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.share-btn:hover {
    background: #16A34A;
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(34, 197, 94, 0.3);
}

/* News Grid */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

/* News Cards */
.news-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: all var(--transition-normal);
    border: 1px solid rgba(156, 163, 175, 0.1);
    position: relative;
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent-cyan);
}

.news-card.breaking {
    border-left: 4px solid var(--success-green);
}

.news-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--surface-dark);
}

.news-image.fallback {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--surface-dark) 0%, var(--card-bg) 100%);
    color: var(--muted);
    font-size: var(--font-size-2xl);
}

.news-content {
    padding: var(--spacing-lg);
}

.news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.news-source {
    font-size: var(--font-size-xs);
    color: var(--muted);
    font-weight: 500;
}

.news-time {
    font-size: var(--font-size-xs);
    color: var(--muted);
}

.news-location {
    font-size: var(--font-size-xs);
    color: var(--accent-cyan);
    background: rgba(34, 211, 238, 0.1);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
}

.news-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.news-title:hover {
    color: var(--accent-cyan);
    cursor: pointer;
}

.news-title a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.news-description {
    font-size: var(--font-size-sm);
    color: var(--muted);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.breaking-tag {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: var(--success-green);
    color: var(--bg-primary);
    font-size: var(--font-size-xs);
    font-weight: 700;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Skeleton Loading */
.skeleton {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
}

.skeleton-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(90deg, var(--card-bg) 25%, rgba(156, 163, 175, 0.1) 50%, var(--card-bg) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

.skeleton-content {
    padding: var(--spacing-lg);
}

.skeleton-line {
    height: 16px;
    background: linear-gradient(90deg, var(--card-bg) 25%, rgba(156, 163, 175, 0.1) 50%, var(--card-bg) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-sm);
}

.skeleton-line.short {
    width: 60%;
}

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

/* Error Container */
.error-container {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.error-message {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: #FCA5A5;
    font-size: var(--font-size-sm);
}

.error-icon {
    font-size: var(--font-size-lg);
}

/* Footer */
.footer {
    background: var(--surface-dark);
    border-top: 1px solid rgba(34, 211, 238, 0.1);
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

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

.footer-section h3,
.footer-section h4 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.footer-section h3 {
    font-size: var(--font-size-xl);
}

.footer-section h4 {
    font-size: var(--font-size-lg);
}

.footer-section p {
    color: var(--muted);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(156, 163, 175, 0.1);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-bottom p {
    color: var(--muted);
    font-size: var(--font-size-sm);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-link {
    color: var(--muted);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
    }
    
    .site-title {
        font-size: var(--font-size-3xl);
    }
    
    .hook-title {
        font-size: var(--font-size-2xl);
    }
    
    .header-content {
        gap: var(--spacing-lg);
    }
    
    .filters-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .filter-group {
        gap: var(--spacing-xs);
    }
    
    .refresh-btn {
        margin-top: 0;
        justify-content: center;
    }
    
    .category-tabs {
        justify-content: center;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }
    
    .section-info {
        width: 100%;
        justify-content: space-between;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .header {
        padding: var(--spacing-lg) 0;
    }
    
    .main {
        padding: var(--spacing-lg) 0;
    }
    
    .filters-section,
    .news-section {
        padding: var(--spacing-lg);
    }
    
    .category-tabs {
        gap: var(--spacing-xs);
    }
    
    .category-tab {
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* Print Styles */
@media print {
    .header,
    .filters-section,
    .footer,
    .share-btn,
    .refresh-btn {
        display: none;
    }
    
    .main {
        padding: 0;
    }
    
    .news-section {
        box-shadow: none;
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
    
    .news-card {
        box-shadow: none;
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .spinner {
        animation: none;
    }
    
    .breaking-tag {
        animation: none;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --bg-primary: #000000;
        --surface-dark: #000000;
        --card-bg: #1a1a1a;
        --text-primary: #ffffff;
        --muted: #cccccc;
    }
    
    .news-card,
    .filters-section,
    .news-section {
        border-width: 2px;
    }
}

/* Focus styles for keyboard navigation */
.filter-select:focus,
.filter-input:focus,
.category-tab:focus,
.refresh-btn:focus,
.share-btn:focus {
    outline: 2px solid var(--accent-cyan);
    outline-offset: 2px;
}

/* Selection styles */
::selection {
    background: var(--accent-cyan);
    color: var(--bg-primary);
}

::-moz-selection {
    background: var(--accent-cyan);
    color: var(--bg-primary);
}