/* AI News - Dark Tech Theme */
:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #1a1f2e;
    --bg-card-hover: #222839;
    --border-color: #2a3044;
    --text-primary: #e4e8f1;
    --text-secondary: #8892a8;
    --text-muted: #5a6478;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --accent-cyan: #06b6d4;
    --cat-ai: #8b5cf6;
    --cat-cybersecurity: #ef4444;
    --cat-startups: #10b981;
    --cat-programming: #3b82f6;
    --cat-hardware: #f59e0b;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 20px rgba(0,0,0,0.3);
    --container-width: 1280px;
}

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

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

a { color: var(--accent-blue); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-purple); }

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

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

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon { font-size: 1.6rem; }
.logo-accent {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-nav {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    align-items: center;
}

.nav-link {
    padding: 6px 14px;
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
    white-space: nowrap;
}

.nav-link:hover { color: var(--text-primary); background: var(--bg-card); }
.nav-link.active {
    background: var(--accent-gradient);
    color: white;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1.4rem;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

/* Page Header */
.page-header {
    padding: 30px 0 10px;
}

.page-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.article-count {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 4px;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 30px;
    padding: 20px 0 40px;
}

/* Article Cards */
.article-list { display: flex; flex-direction: column; gap: 16px; }

.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all 0.2s;
}

.article-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-blue);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.article-image {
    width: 100%;
    max-height: 200px;
    overflow: hidden;
}

.article-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-body { padding: 16px 20px; }

.article-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.article-source {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-cyan);
}

.article-category {
    font-size: 0.75rem;
    padding: 2px 10px;
    border-radius: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.cat-ai { background: rgba(139,92,246,0.15); color: var(--cat-ai); }
.cat-cybersecurity { background: rgba(239,68,68,0.15); color: var(--cat-cybersecurity); }
.cat-startups { background: rgba(16,185,129,0.15); color: var(--cat-startups); }
.cat-programming { background: rgba(59,130,246,0.15); color: var(--cat-programming); }
.cat-hardware { background: rgba(245,158,11,0.15); color: var(--cat-hardware); }
.cat-general { background: rgba(107,114,128,0.15); color: #9ca3af; }

.article-time {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-left: auto;
}

.article-title {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 8px;
}

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

.article-excerpt {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 12px;
}

.article-actions {
    display: flex;
    gap: 10px;
}

.btn-read, .btn-source {
    font-size: 0.85rem;
    padding: 6px 14px;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-read {
    background: var(--accent-gradient);
    color: white;
}

.btn-read:hover { color: white; opacity: 0.9; }

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

.btn-source:hover { color: var(--text-primary); border-color: var(--accent-blue); }

/* Sidebar */
.sidebar { display: flex; flex-direction: column; gap: 20px; }

.sidebar-widget {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
}

.sidebar-widget h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.category-list, .source-list {
    list-style: none;
}

.category-list li, .source-list li {
    margin-bottom: 4px;
}

.category-list a {
    display: block;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all 0.2s;
}

.category-list a:hover, .category-list a.active {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.source-list li {
    padding: 6px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border-color);
}

.source-list li:last-child { border-bottom: none; }

/* Ad Containers */
.ad-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 20px;
}

.ad-hero { margin: 15px 0; }
.ad-inline { margin: 16px 0; }
.ad-footer { margin-bottom: 20px; }
.ad-sidebar { margin-bottom: 0; }

/* Article Detail */
.article-full {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 30px;
}

.article-full-title {
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1.3;
    margin: 16px 0 20px;
}

.article-full-image {
    margin: 0 -30px 20px;
    overflow: hidden;
}

.article-full-image img {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
}

.article-full-content {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.article-full-content img { max-width: 100%; border-radius: var(--radius-sm); }
.article-full-content a { color: var(--accent-blue); }
.article-full-content p { margin-bottom: 14px; }

.article-full-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.btn-primary {
    display: inline-block;
    background: var(--accent-gradient);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    transition: opacity 0.2s;
}

.btn-primary:hover { color: white; opacity: 0.9; }

.btn-secondary {
    display: inline-block;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.btn-secondary:hover { color: var(--text-primary); border-color: var(--accent-blue); }

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.empty-state h2 { margin-bottom: 10px; }
.empty-state p { color: var(--text-secondary); }

/* Footer */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 30px 0;
    margin-top: 40px;
}

.footer-inner {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-sources {
    margin-top: 6px;
    font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
    .sidebar {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn { display: block; }

    .main-nav {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        padding: 12px 20px;
        flex-direction: column;
        gap: 4px;
        box-shadow: var(--shadow);
    }

    .main-nav.open { display: flex; }

    .nav-link { padding: 10px 14px; }

    .page-header h1 { font-size: 1.4rem; }

    .article-full { padding: 20px; }
    .article-full-title { font-size: 1.3rem; }
    .article-full-image { margin: 0 -20px 16px; }

    .article-full-actions { flex-direction: column; }
    .btn-primary, .btn-secondary { text-align: center; }
}

@media (max-width: 480px) {
    .article-meta { gap: 6px; }
    .article-time { margin-left: 0; width: 100%; }
}