/* AI SEO Farm - Modern Responsive Styles */
:root {
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #3730a3;
    --primary-bg: #eef2ff;
    --accent: #06b6d4;
    --bg: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text: #0f172a;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --radius: 16px;
    --radius-sm: 8px;
    --radius-full: 9999px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
    --shadow-lg: 0 20px 40px -10px rgba(0,0,0,0.12);
    --max-width: 1200px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: var(--bg-secondary);
    line-height: 1.8;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { text-decoration: none; color: inherit; transition: color var(--transition); }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ========== Header ========== */
header {
    background: rgba(255,255,255,0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-light);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}
header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}
.logo {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 8px;
}
nav { display: flex; align-items: center; gap: 8px; }
nav a {
    padding: 6px 14px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: var(--radius-full);
    transition: all var(--transition);
}
nav a:hover {
    color: var(--primary);
    background: var(--primary-bg);
}

/* ========== Hero ========== */
.hero {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #a855f7 100%);
    color: white;
    padding: 80px 0 90px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 60%);
    pointer-events: none;
}
.hero h1 {
    font-size: 2.75rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.03em;
    line-height: 1.2;
    position: relative;
}
.hero p {
    font-size: 1.15rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
    position: relative;
}

/* ========== Breadcrumb ========== */
.breadcrumb {
    padding: 16px 0;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ========== Section Title ========== */
.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 40px 0 8px;
    color: var(--text);
    letter-spacing: -0.02em;
}
.section-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* ========== Article Grid ========== */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
    padding: 8px 0 40px;
}

.article-card {
    background: var(--bg);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
}
.article-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}
.article-card .card-body {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.article-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    line-height: 1.5;
    letter-spacing: -0.01em;
}
.article-card h3 a {
    color: var(--text);
    transition: color var(--transition);
}
.article-card h3 a:hover { color: var(--primary); }
.article-card .excerpt {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 16px;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-card .meta {
    color: var(--text-tertiary);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    padding-top: 12px;
    border-top: 1px solid var(--border-light);
}

/* ========== Tags ========== */
.tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-bg);
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--primary);
    margin: 2px 4px 2px 0;
    transition: all var(--transition);
}
.tag:hover {
    background: var(--primary);
    color: white;
}

/* ========== Article Page ========== */
.article-content {
    max-width: 780px;
    margin: 0 auto;
    padding: 32px 24px 60px;
}
.article-content h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.35;
    letter-spacing: -0.03em;
    color: var(--text);
}
.article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
    font-size: 0.88rem;
    color: var(--text-secondary);
}
.article-meta .divider { width: 4px; height: 4px; background: var(--border); border-radius: 50%; }

.article-body {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}
.article-body h2 {
    font-size: 1.45rem;
    font-weight: 700;
    margin: 36px 0 16px;
    padding-bottom: 10px;
    border-bottom: 3px solid var(--primary-bg);
    color: var(--text);
    letter-spacing: -0.01em;
}
.article-body h2:first-child { margin-top: 0; }
.article-body h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 28px 0 12px;
    color: var(--text);
}
.article-body h4 { font-size: 1.05rem; font-weight: 600; margin: 20px 0 10px; }
.article-body p { margin-bottom: 18px; color: var(--text); line-height: 1.85; }
.article-body ul, .article-body ol {
    margin: 16px 0;
    padding-left: 28px;
}
.article-body li {
    margin-bottom: 8px;
    line-height: 1.7;
}
.article-body a {
    color: var(--primary);
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition);
}
.article-body a:hover { border-bottom-color: var(--primary); }
.article-body img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    margin: 24px 0;
    box-shadow: var(--shadow);
}
.article-body pre {
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding: 20px;
    overflow-x: auto;
    margin: 20px 0;
    font-size: 0.9rem;
    border: 1px solid var(--border);
}
.article-body code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.88em;
}
.article-body pre code {
    background: none;
    padding: 0;
}
.article-body blockquote {
    border-left: 4px solid var(--primary);
    padding: 16px 20px;
    margin: 20px 0;
    background: var(--primary-bg);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-secondary);
    font-style: italic;
}
.article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}
.article-body th, .article-body td {
    padding: 10px 14px;
    border: 1px solid var(--border);
    text-align: left;
}
.article-body th {
    background: var(--bg-tertiary);
    font-weight: 600;
}
.article-body strong { font-weight: 700; }

/* ========== FAQ ========== */
.faq-section {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 32px;
    margin: 40px 0;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}
.faq-section h2 { margin-top: 0 !important; border-bottom: none !important; padding-bottom: 0 !important; }
.faq-item {
    margin-bottom: 20px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
}
.faq-item:last-child { margin-bottom: 0; }
.faq-item h4 {
    color: var(--primary-dark);
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 1rem;
}
.faq-item p { margin-bottom: 0; color: var(--text-secondary); line-height: 1.7; }

/* ========== Related Articles ========== */
.related-section {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 2px solid var(--border);
}

/* ========== View All Button ========== */
.view-all-wrap {
    text-align: center;
    margin: 40px 0 20px;
}
.btn-view-all {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 36px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition);
    box-shadow: 0 4px 16px rgba(79, 70, 229, 0.3);
}
.btn-view-all:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(79, 70, 229, 0.45);
    color: white;
}
.btn-view-all .badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.25);
    color: white;
    border-radius: var(--radius-full);
    padding: 2px 10px;
    font-size: 0.82rem;
    font-weight: 700;
}

/* ========== Articles List Page ========== */
.hero-sm {
    padding: 36px 0 44px;
}
.hero-sm h1 { font-size: 2rem; }
.hero-sm p { font-size: 1rem; }

.tags-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 20px 0 28px;
    padding: 16px 20px;
    background: var(--bg);
    border-radius: var(--radius);
    border: 1px solid var(--border-light);
}

.articles-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: 24px 0;
}
.article-list-item {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 24px 28px;
    border: 1px solid var(--border-light);
    transition: all var(--transition);
}
.article-list-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow);
    transform: translateX(4px);
}
.article-list-item h2 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.5;
}
.article-list-item h2 a { color: var(--text); transition: color var(--transition); }
.article-list-item h2 a:hover { color: var(--primary); }
.article-list-item .excerpt {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.65;
    margin-bottom: 12px;
}
.article-list-item .meta {
    color: var(--text-tertiary);
    font-size: 0.82rem;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.tag-sm { padding: 2px 8px; font-size: 0.72rem; }

/* ========== Pagination ========== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 40px 0;
    flex-wrap: wrap;
}
.page-numbers {
    display: flex;
    gap: 4px;
    align-items: center;
}
.page-btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--primary);
    transition: all var(--transition);
}
.page-btn:hover:not(.disabled) {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}
.page-btn.disabled {
    color: var(--text-tertiary);
    cursor: not-allowed;
    opacity: 0.5;
}
.page-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all var(--transition);
}
a.page-num:hover {
    background: var(--primary-bg);
    color: var(--primary);
}
.page-num.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}
.page-dots {
    color: var(--text-tertiary);
    padding: 0 4px;
}

nav a.active {
    color: var(--primary);
    font-weight: 600;
    border-bottom: 2px solid var(--primary);
}

/* ========== Ad Slot ========== */
.ad-slot {
    background: var(--bg);
    border: 1px dashed var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
    margin: 24px 0;
    min-height: 100px;
    overflow: hidden;
}
.ad-slot ins.adsbygoogle {
    display: block !important;
    width: 100% !important;
    min-width: 250px;
}

/* ========== Footer ========== */
footer {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: #cbd5e1;
    padding: 48px 0 32px;
    text-align: center;
    margin-top: 60px;
}
footer p { margin-bottom: 12px; font-size: 0.9rem; }
footer a { color: #93c5fd; transition: color var(--transition); }
footer a:hover { color: white; }
footer .footer-links { margin-top: 8px; }
footer .footer-links a { margin: 0 8px; }

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .hero { padding: 50px 0 60px; }
    .hero h1 { font-size: 1.8rem; }
    .hero p { font-size: 1rem; }
    .hero-sm { padding: 28px 0 36px; }
    .hero-sm h1 { font-size: 1.5rem; }
    .article-grid { grid-template-columns: 1fr; gap: 16px; }
    .article-content h1 { font-size: 1.6rem; }
    .article-body { padding: 24px 20px; }
    nav { gap: 2px; }
    nav a { padding: 6px 10px; font-size: 0.82rem; }
    header .container { padding: 0 16px; }
    .container { padding: 0 16px; }
    .faq-section { padding: 20px; }
    .article-list-item { padding: 18px 20px; }
    .article-list-item h2 { font-size: 1.05rem; }
    .pagination { gap: 4px; }
    .page-btn { padding: 8px 14px; font-size: 0.82rem; }
    .page-num { width: 34px; height: 34px; font-size: 0.82rem; }
    .tags-bar { padding: 12px 14px; gap: 6px; }
}
@media (max-width: 480px) {
    .article-grid { grid-template-columns: 1fr; }
    .article-body { padding: 20px 16px; }
    .hero h1 { font-size: 1.5rem; }
    .article-content { padding: 24px 16px 40px; }
    .btn-view-all { padding: 12px 28px; font-size: 0.92rem; }
}