/**
 * 企业前台公共样式 - Client Portal Common Styles
 * 简洁大方、专业商务感，适合B2B制造业/中小企业
 */

/* ========================================
   1. CSS Variables & Reset
   ======================================== */
:root {
    --primary: #2563EB;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary: #10B981;
    --accent: #F59E0B;
    --bg: #F8FAFC;
    --bg-secondary: #F1F5F9;
    --card: #FFFFFF;
    --text: #1E293B;
    --text-secondary: #64748B;
    --text-light: #94A3B8;
    --border: #E2E8F0;
    --border-light: #F1F5F9;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 4px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --nav-height: 72px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 15px;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
}

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

a:hover {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
    height: auto;
}

/* ========================================
   2. Navigation Bar
   ======================================== */
.client-nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--card);
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition);
}

.client-nav.scrolled {
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    height: var(--nav-height);
    gap: 32px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    flex-shrink: 0;
}

.nav-logo {
    width: 60px;
    height: 60px;
    border-radius: var(--radius);
    object-fit: cover;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
}

.nav-logo img {
    width: 100%;
    height: 100%;
    border-radius: var(--radius);
    object-fit: cover;
}

.nav-company {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    letter-spacing: 0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
}

.nav-link {
    padding: 10px 16px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius);
    transition: var(--transition);
    position: relative;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--primary);
    background: rgba(37, 99, 235, 0.06);
}

.nav-link.active {
    color: var(--primary);
    background: rgba(37, 99, 235, 0.08);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    margin-left: auto;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    margin: 5px 0;
    border-radius: 2px;
    transition: var(--transition);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--card);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        width: 100%;
        padding: 12px 16px;
    }
    
    .nav-link.active::after {
        display: none;
    }
}

/* ========================================
   3. Hero / Banner Section
   ======================================== */
.hero-banner {
    position: relative;
    padding: 80px 24px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 50%, #1e40af 100%);
    overflow: hidden;
}

.hero-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-banner .container {
    position: relative;
    z-index: 1;
}

.hero-content {
    text-align: center;
    color: white;
}

.hero-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: 1px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: 18px;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 24px;
    line-height: 1.6;
}

.hero-tags {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.hero-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    font-size: 13px;
    color: white;
    backdrop-filter: blur(4px);
}

.hero-banner.has-image {
    min-height: 400px;
    display: flex;
    align-items: center;
}

.hero-banner.has-image .hero-bg-image {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    z-index: 0;
}

.hero-banner.has-image .hero-bg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.85) 0%, rgba(30, 64, 175, 0.9) 100%);
    z-index: 1;
}

.hero-banner.has-image .container {
    position: relative;
    z-index: 2;
}

@media (max-width: 768px) {
    .hero-banner {
        padding: 60px 20px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 15px;
    }
}

/* ========================================
   4. Page Navigation (Breadcrumb)
   ======================================== */
.page-nav {
    background: var(--card);
    border-bottom: 1px solid var(--border-light);
}

.page-nav .container {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    max-width: var(--max-width);
    margin: 0 auto;
    font-size: 14px;
}

.page-nav a {
    color: var(--text-secondary);
}

.page-nav a:hover {
    color: var(--primary);
}

.page-nav span {
    color: var(--text-light);
}

/* ========================================
   5. Container & Layout
   ======================================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 60px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 15px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   6. Cards
   ======================================== */
.card {
    background: var(--card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--border);
}

.card-image {
    position: relative;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.card:hover .card-image img {
    transform: scale(1.05);
}

.card-body {
    padding: 20px;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
    display: block;
    line-height: 1.4;
}

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

.card-summary {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.6;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: var(--text-light);
}

.card-meta i {
    margin-right: 4px;
}

/* Article Card Specific */
.article-card .card-image {
    height: 180px;
}

.article-card .card-image img {
    height: 100%;
}

/* Product Card Specific */
.product-card .card-image {
    height: 220px;
}

.product-card .card-image img {
    height: 100%;
}

.product-card .product-price {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
}

.product-card .product-price small {
    font-size: 13px;
    font-weight: normal;
    color: var(--text-secondary);
}

/* ========================================
   7. Sidebar
   ======================================== */
.sidebar {
    background: var(--card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    padding: 24px;
}

.sidebar-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-title i {
    color: var(--primary);
}

.sidebar-list {
    list-style: none;
}

.sidebar-item {
    display: flex;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition);
}

.sidebar-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.sidebar-item:first-child {
    padding-top: 0;
}

.sidebar-item:hover {
    background: var(--bg);
    margin: 0 -12px;
    padding-left: 12px;
    padding-right: 12px;
    border-radius: var(--radius);
}

.sidebar-item-image {
    width: 60px;
    height: 60px;
    border-radius: var(--radius);
    object-fit: cover;
    flex-shrink: 0;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 20px;
}

.sidebar-item-content h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 4px;
    line-height: 1.4;
}

.sidebar-item-content h4 a {
    color: var(--text);
}

.sidebar-item-content h4 a:hover {
    color: var(--primary);
}

.sidebar-item-content span {
    font-size: 12px;
    color: var(--text-light);
}

/* ========================================
   8. Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.4);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 15px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-block {
    width: 100%;
}

/* ========================================
   9. Pagination
   ======================================== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border-light);
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    border-radius: var(--radius);
    font-size: 14px;
    transition: var(--transition);
}

.pagination a {
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

.pagination a:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

.pagination .current {
    background: var(--primary);
    color: white;
    border: 1px solid var(--primary);
}

.pagination .disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ========================================
   10. Footer
   ======================================== */
.client-footer {
    background: #1E293B;
    color: white;
    padding: 60px 0 0;
    margin-top: 80px;
}

.footer-main {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo {
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    object-fit: cover;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 16px;
}

.footer-logo img {
    width: 100%;
    height: 100%;
    border-radius: var(--radius);
    object-fit: cover;
}

.footer-company {
    font-size: 18px;
    font-weight: 600;
}

.footer-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    margin-bottom: 16px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

.footer-column h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 20px;
    color: white;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
    padding-left: 4px;
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

.footer-contact-item i {
    color: var(--primary-light);
    margin-top: 2px;
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 768px) {
    .client-footer {
        padding: 48px 0 0;
    }
    
    .footer-main {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

/* ========================================
   11. Article Detail Page
   ======================================== */
.article-detail-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 24px;
}

.article-header-card {
    background: var(--card);
    border-radius: var(--radius-xl);
    padding: 40px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.article-author {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

.author-avatar img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

.author-info {
    flex: 1;
}

.author-name {
    font-weight: 600;
    color: var(--text);
    font-size: 15px;
}

.author-date {
    font-size: 13px;
    color: var(--text-light);
}

.article-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 16px;
    line-height: 1.3;
    letter-spacing: 0.5px;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
    font-size: 14px;
    color: var(--text-secondary);
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.article-cover-image {
    width: 100%;
    max-height: 450px;
    object-fit: cover;
    border-radius: var(--radius-xl);
    margin-bottom: 32px;
    box-shadow: var(--shadow);
}

/* Rich Text Content - Medium Style */
.article-content {
    background: var(--card);
    border-radius: var(--radius-xl);
    padding: 48px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    font-size: 17px;
    line-height: 1.85;
    color: var(--text);
}

.article-content > *:first-child {
    margin-top: 0 !important;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5,
.article-content h6 {
    font-weight: 700;
    color: var(--text);
    margin-top: 32px;
    margin-bottom: 16px;
    line-height: 1.4;
}

.article-content h1 { font-size: 28px; }
.article-content h2 { font-size: 24px; }
.article-content h3 { font-size: 20px; }
.article-content h4 { font-size: 18px; }
.article-content h5 { font-size: 16px; }
.article-content h6 { font-size: 15px; }

.article-content p {
    margin-bottom: 20px;
}

.article-content a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

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

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    margin: 24px 0;
    box-shadow: var(--shadow-sm);
}

.article-content ul,
.article-content ol {
    margin: 20px 0;
    padding-left: 28px;
}

.article-content li {
    margin-bottom: 10px;
    padding-left: 4px;
}

.article-content ul li {
    list-style-type: disc;
}

.article-content ol li {
    list-style-type: decimal;
}

.article-content blockquote {
    margin: 24px 0;
    padding: 20px 24px;
    background: var(--bg);
    border-left: 4px solid var(--primary);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--text-secondary);
    font-style: italic;
}

.article-content blockquote p:last-child {
    margin-bottom: 0;
}

.article-content pre {
    background: #1E293B;
    color: #E2E8F0;
    padding: 20px 24px;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 24px 0;
    font-size: 14px;
    line-height: 1.6;
}

.article-content code {
    font-family: "SF Mono", "Fira Code", Consolas, monospace;
    background: var(--bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--primary-dark);
}

.article-content pre code {
    background: none;
    padding: 0;
    color: inherit;
    font-size: inherit;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 15px;
}

.article-content table th,
.article-content table td {
    padding: 12px 16px;
    border: 1px solid var(--border);
    text-align: left;
}

.article-content table th {
    background: var(--bg);
    font-weight: 600;
    color: var(--text);
}

.article-content table tr:nth-child(even) {
    background: var(--bg);
}

.article-content hr {
    margin: 32px 0;
    border: none;
    border-top: 1px solid var(--border);
}

@media (max-width: 768px) {
    .article-detail-container {
        padding: 24px 16px;
    }
    
    .article-header-card,
    .article-content {
        padding: 24px;
        border-radius: var(--radius-lg);
    }
    
    .article-title {
        font-size: 24px;
    }
    
    .article-content {
        font-size: 16px;
        padding: 20px;
    }
}

/* ========================================
   12. FAQ Accordion
   ======================================== */
.faq-section {
    background: var(--card);
    border-radius: var(--radius-xl);
    padding: 32px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.faq-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
}

.faq-title i {
    color: var(--primary);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-light);
}

.faq-item.active {
    border-color: var(--primary);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.15);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
    background: var(--card);
}

.faq-question:hover {
    background: var(--bg);
}

.faq-item.active .faq-question {
    color: var(--primary);
    background: rgba(37, 99, 235, 0.03);
}

.faq-question i {
    transition: transform 0.3s ease;
    color: var(--text-secondary);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
    color: var(--primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer-content {
    padding: 0 20px 16px;
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
    border-top: 1px solid var(--border-light);
    padding-top: 16px;
}

/* ========================================
   13. Related Articles
   ======================================== */
.related-section {
    background: var(--card);
    border-radius: var(--radius-xl);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.related-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
}

.related-title i {
    color: var(--primary);
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.related-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    transition: var(--transition);
    background: var(--card);
}

.related-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.related-card h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-card h4:hover {
    color: var(--primary);
}

.related-card p {
    font-size: 12px;
    color: var(--text-light);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ========================================
   14. Product Detail Page
   ======================================== */
.product-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.product-gallery {
    background: var(--card);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.product-main-image {
    width: 100%;
    height: 450px;
    object-fit: cover;
}

.product-thumbnails {
    display: flex;
    gap: 8px;
    padding: 16px;
    overflow-x: auto;
}

.product-thumbnail {
    width: 80px;
    height: 80px;
    border-radius: var(--radius);
    object-fit: cover;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    flex-shrink: 0;
}

.product-thumbnail:hover,
.product-thumbnail.active {
    border-color: var(--primary);
}

.product-info-card {
    background: var(--card);
    border-radius: var(--radius-xl);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.product-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 16px;
    line-height: 1.3;
}

.product-price-row {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-light);
}

.product-price {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
}

.product-price small {
    font-size: 16px;
    font-weight: normal;
    color: var(--text-secondary);
}

.product-summary {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.7;
}

.product-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
}

.product-meta-table {
    width: 100%;
    font-size: 14px;
}

.product-meta-table tr {
    border-bottom: 1px solid var(--border-light);
}

.product-meta-table tr:last-child {
    border-bottom: none;
}

.product-meta-table th {
    padding: 12px 0;
    font-weight: 500;
    color: var(--text-secondary);
    text-align: left;
    width: 100px;
}

.product-meta-table td {
    padding: 12px 0;
    color: var(--text);
}

@media (max-width: 768px) {
    .product-detail-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .product-main-image {
        height: 300px;
    }
    
    .product-title {
        font-size: 22px;
    }
    
    .product-price {
        font-size: 28px;
    }
}

/* ========================================
   15. About Page
   ======================================== */
.about-card {
    background: var(--card);
    border-radius: var(--radius-xl);
    padding: 48px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.about-header {
    text-align: center;
    margin-bottom: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid var(--border-light);
}

.about-logo {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-xl);
    object-fit: cover;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 48px;
    margin-left: auto;
    margin-right: auto;
}

.about-logo img {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-xl);
    object-fit: cover;
}

.about-company-name {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.about-industry {
    font-size: 15px;
    color: var(--text-secondary);
}

.about-section-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.about-section-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--primary);
    border-radius: 2px;
}

.about-description {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.info-card {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 20px;
    transition: var(--transition);
}

.info-card:hover {
    background: var(--card);
    box-shadow: var(--shadow);
}

.info-card-label {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.info-card-label i {
    color: var(--primary);
}

.info-card-value {
    font-size: 15px;
    color: var(--text);
    font-weight: 500;
}

@media (max-width: 768px) {
    .about-card {
        padding: 24px;
    }
    
    .about-logo {
        width: 100px;
        height: 100px;
    }
    
    .about-company-name {
        font-size: 22px;
    }
}

/* ========================================
   16. Contact Page
   ======================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 40px;
}

.contact-info-card {
    background: var(--card);
    border-radius: var(--radius-xl);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.contact-info-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--primary);
}

.contact-item {
    display: flex;
    gap: 16px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-light);
}

.contact-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.contact-item:first-child {
    padding-top: 0;
}

.contact-item-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(37, 99, 235, 0.05) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-item-icon i {
    font-size: 20px;
    color: var(--primary);
}

.contact-item-content h4 {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 4px;
    font-weight: 500;
}

.contact-item-content p {
    font-size: 15px;
    color: var(--text);
    margin: 0;
}

.contact-form-card {
    background: var(--card);
    border-radius: var(--radius-xl);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.contact-form-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--primary);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--card);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.form-message {
    margin-bottom: 16px;
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    display: none;
}

.form-message.success {
    background: #D1FAE5;
    color: #065F46;
    display: block;
}

.form-message.error {
    background: #FEE2E2;
    color: #991B1B;
    display: block;
}

@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .contact-info-card,
    .contact-form-card {
        padding: 24px;
    }
}

/* ========================================
   17. Empty State
   ======================================== */
.empty-state {
    text-align: center;
    padding: 80px 40px;
    background: var(--card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.empty-state-icon i {
    font-size: 32px;
    color: var(--text-light);
}

.empty-state-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
}

.empty-state-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* ========================================
   18. Quick Actions
   ======================================== */
.quick-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 24px;
}

/* ========================================
   19. Utility Classes
   ======================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-light { color: var(--text-light); }
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: 16px; }
.mt-8 { margin-top: 32px; }
.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: 16px; }
.mb-8 { margin-bottom: 32px; }

/* ========================================
   20. Animations
   ======================================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

.fade-in-delay-1 { animation-delay: 0.1s; opacity: 0; }
.fade-in-delay-2 { animation-delay: 0.2s; opacity: 0; }
.fade-in-delay-3 { animation-delay: 0.3s; opacity: 0; }

/* Loading placeholder */
.skeleton {
    background: linear-gradient(90deg, var(--bg) 25%, var(--border-light) 50%, var(--bg) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

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

/* ========================================
   21. Article List Style
   ======================================== */
.article-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.article-list-item {
    display: flex;
    gap: 16px;
    background: var(--card);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.article-list-item:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
    border-color: var(--primary-light);
}

.article-list-image {
    width: 120px;
    height: 90px;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

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

.article-list-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.article-list-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.article-list-summary {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.6;
}

.article-list-meta {
    display: flex;
    gap: 20px;
    font-size: 12px;
    color: var(--text-light);
}

.article-list-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Responsive */
@media (max-width: 576px) {
    .article-list-item {
        flex-direction: column;
    }
    
    .article-list-image {
        width: 100%;
        height: 160px;
    }
}