:root {
    --primary-color: #0f62fe;
    --secondary-color: #161616;
    --accent-color: #ff6b35;
    --background-color: #f4f4f4;
    --card-background: #ffffff;
    --text-primary: #161616;
    --text-secondary: #525252;
    --border-color: #e0e0e0;
    --success-color: #24a148;
    --warning-color: #f1c21b;
    --error-color: #da1e28;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --border-radius: 8px;
}

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

body {
    font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.dashboard-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.dashboard-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 1.5rem 0;
    box-shadow: var(--shadow);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-section i {
    font-size: 2rem;
    color: var(--accent-color);
}

.logo-section h1 {
    font-size: 1.8rem;
    font-weight: 600;
}

.stats-section {
    display: flex;
    gap: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.update-info {
    font-size: 0.9rem;
    opacity: 0.8;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Navigation Styles */
.category-nav {
    background: var(--card-background);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.category-nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.category-nav::-webkit-scrollbar {
    display: none;
}

.nav-btn {
    background: transparent;
    border: 2px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.nav-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

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

.category-count {
    background: rgba(255,255,255,0.2);
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: bold;
}

.nav-btn.active .category-count {
    background: rgba(255,255,255,0.3);
}

/* Main Content Styles */
.dashboard-main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

.top-stories h2,
.category-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.top-stories h2 i,
.category-section h2 i {
    color: var(--primary-color);
}

/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.article-card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.article-card.priority-1 {
    border-left-color: var(--success-color);
}

.article-card.priority-2 {
    border-left-color: var(--warning-color);
}

.article-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.source-badge {
    background: var(--primary-color);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 16px;
    font-size: 0.8rem;
    font-weight: 500;
}

.category-badge {
    padding: 0.3rem 0.8rem;
    border-radius: 16px;
    font-size: 0.8rem;
    font-weight: 500;
    background: var(--background-color);
    color: var(--text-primary);
}

.category-ai_watson { background: #e3f2fd; color: #1565c0; }
.category-cloud_hybrid { background: #f3e5f5; color: #7b1fa2; }
.category-quantum { background: #fff3e0; color: #f57c00; }
.category-enterprise { background: #e8f5e8; color: #2e7d32; }
.category-partnerships { background: #fff8e1; color: #f9a825; }
.category-research { background: #fce4ec; color: #c2185b; }
.category-financial { background: #e1f5fe; color: #0277bd; }
.category-latest { background: var(--accent-color); color: white; }

.article-title {
    margin-bottom: 0.75rem;
}

.article-title a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
}

.article-title a:hover {
    color: var(--primary-color);
}

.article-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 1rem;
}

.article-date {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.article-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
}

.keyword-tag {
    background: var(--background-color);
    color: var(--text-secondary);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
}

/* Articles List */
.articles-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.article-item {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.article-item:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.article-item.priority-1 {
    border-left-color: var(--success-color);
}

.article-item.priority-2 {
    border-left-color: var(--warning-color);
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.article-item .article-title {
    margin-bottom: 0.5rem;
}

.article-item .article-title a {
    font-size: 1.05rem;
}

.article-item .article-description {
    margin-bottom: 0.75rem;
}

/* Footer Styles */
.dashboard-footer {
    background: var(--secondary-color);
    color: white;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--accent-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .stats-section {
        gap: 1rem;
    }
    
    .dashboard-main {
        padding: 1rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .article-header,
    .article-footer,
    .article-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .nav-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 0 1rem;
    }
    
    .logo-section h1 {
        font-size: 1.4rem;
    }
    
    .stat-number {
        font-size: 1.2rem;
    }
    
    .category-nav {
        padding: 0.5rem 1rem;
    }
    
    .article-card,
    .article-item {
        padding: 1rem;
    }
}

/* Animation for section transitions */
.category-section {
    animation: fadeIn 0.3s ease-in-out;
}

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

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}