/* ========================================
   上海芮浦新材料有限公司 - 企业网站样式
   主色调: #0055b3 (深蓝) / #007bff (亮蓝)
   响应式适配 PC + H5
   ======================================== */

:root {
    --primary: #0055b3;
    --primary-light: #007bff;
    --primary-dark: #003d7a;
    --primary-bg: #f0f7ff;
    --text-dark: #333;
    --text-gray: #666;
    --text-light: #999;
    --border-color: #e8e8e8;
    --bg-gray: #f8f9fa;
    --white: #fff;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

/* ===== Global ===== */
body {
    font-family: var(--font-family);
    color: var(--text-dark);
    background: var(--white);
    font-size: 15px;
    line-height: 1.8;
    padding-top: 80px;
}

@media (max-width: 767px) {
    body { padding-top: 60px; font-size: 14px; }
}

a {
    color: var(--primary);
    transition: all 0.3s ease;
    outline: none;
}
a:hover {
    color: var(--primary-light);
    text-decoration: none;
}
a:focus {
    outline: none;
}
a:active {
    outline: none;
}

.container {
    max-width: 1200px;
}

/* ===== Header / Navigation (Bootstrap Navbar) ===== */
.enterprise-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.enterprise-header .navbar {
    margin-bottom: 0;
    border: none;
    background: transparent;
    min-height: 80px;
}

.enterprise-header .navbar-brand {
    height: 80px;
    padding: 15px 15px;
    display: flex;
    align-items: center;
}

.enterprise-header .logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 2px;
    line-height: 1.2;
}

.enterprise-header .logo-sub {
    display: block;
    font-size: 11px;
    color: var(--text-light);
    letter-spacing: 1px;
    font-weight: 400;
}

.enterprise-header .navbar-nav > li > a {
    padding: 0 18px;
    height: 80px;
    line-height: 80px;
    color: var(--text-dark);
    font-size: 15px;
    font-weight: 500;
    position: relative;
    transition: all 0.3s ease;
}

.enterprise-header .navbar-nav > li > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: var(--primary);
    transition: width 0.3s ease;
    border-radius: 2px;
}

.enterprise-header .navbar-nav > li > a:hover,
.enterprise-header .navbar-nav > li.active > a { color: var(--primary); background: transparent; }

.enterprise-header .navbar-nav > li > a:hover::after,
.enterprise-header .navbar-nav > li.active > a::after { width: 60%; }

/* Mobile navbar */
.enterprise-header .navbar-toggle {
    margin-top: 13px;
    border-color: var(--primary);
}
.enterprise-header .navbar-toggle .icon-bar {
    background-color: var(--primary);
}

@media (max-width: 767px) {
    .enterprise-header .navbar { min-height: 60px; }
    .enterprise-header .navbar-brand {
        height: 60px;
        padding: 8px 15px;
    }
    .enterprise-header .logo-text { font-size: 16px; }
    .enterprise-header .logo-sub { display: none; }
    .enterprise-header .navbar-nav > li > a {
        height: auto;
        line-height: 1.5;
        padding: 12px 15px;
        text-align: center;
        border-bottom: 1px solid #f0f0f0;
    }
    .enterprise-header .navbar-nav > li > a::after { display: none; }
    .enterprise-header .navbar-nav > li.active > a { color: var(--primary); background: var(--primary-bg); }
    .enterprise-header .navbar-collapse {
        background: var(--white);
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        max-height: 80vh;
        overflow-y: auto;
    }
}

/* Page Banner */
.page-banner {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 60px 0;
    text-align: center;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 60%);
    animation: bannerGlow 8s ease-in-out infinite alternate;
}

@keyframes bannerGlow {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(20px, 20px) rotate(5deg); }
}

.page-banner h1 {
    font-size: 36px;
    font-weight: 700;
    margin: 0 0 10px;
    position: relative;
    z-index: 1;
}

.page-banner .breadcrumb {
    background: transparent;
    padding: 0;
    margin: 0;
    justify-content: center;
    position: relative;
    z-index: 1;
}

.page-banner .breadcrumb a,
.page-banner .breadcrumb > .active {
    color: rgba(255,255,255,0.8);
}

.page-banner .breadcrumb > li + li::before {
    color: rgba(255,255,255,0.5);
    content: "/\00a0";
}

/* ===== Section Common ===== */
.section {
    padding: 80px 0;
}

.section-gray { background: var(--bg-gray); }
.section-primary { background: var(--primary-bg); }

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-dark);
    margin: 0 0 15px;
    position: relative;
}

.section-title h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--primary);
    margin: 15px auto 0;
    border-radius: 2px;
}

.section-title p {
    color: var(--text-gray);
    font-size: 16px;
    margin: 10px 0 0;
}

/* ===== Homepage Hero Banner ===== */
.hero-banner {
    position: relative;
    height: 550px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary) 0%, #001a33 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-banner .hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
}

.hero-banner .hero-slide.active {
    opacity: 1;
    position: relative;
}

.hero-banner .banner-content {
    max-width: 800px;
    padding: 0 20px;
    position: relative;
    z-index: 2;
}

.hero-banner .banner-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin: 0 0 20px;
    letter-spacing: 3px;
}

.hero-banner .banner-content p {
    font-size: 18px;
    opacity: 0.9;
    margin: 0 0 30px;
    line-height: 1.8;
}

.hero-banner .banner-content .btn-banner {
    display: inline-block;
    padding: 14px 40px;
    background: var(--white);
    color: var(--primary);
    font-size: 16px;
    font-weight: 600;
    border-radius: 30px;
    transition: all 0.3s ease;
}

.hero-banner .banner-content .btn-banner:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.hero-banner .hero-indicators {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    gap: 10px;
}

.hero-banner .hero-indicators span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    cursor: pointer;
    transition: all 0.3s ease;
}

.hero-banner .hero-indicators span.active {
    background: var(--white);
    width: 30px;
    border-radius: 6px;
}

.hero-banner .banner-content {
    max-width: 800px;
    padding: 0 20px;
    position: relative;
    z-index: 2;
}

.hero-banner .banner-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin: 0 0 20px;
    letter-spacing: 3px;
}

.hero-banner .banner-content p {
    font-size: 18px;
    opacity: 0.9;
    margin: 0 0 30px;
    line-height: 1.8;
}

.hero-banner .banner-content .btn-banner {
    display: inline-block;
    padding: 14px 40px;
    background: var(--white);
    color: var(--primary);
    font-size: 16px;
    font-weight: 600;
    border-radius: 30px;
    transition: all 0.3s ease;
}

.hero-banner .banner-content .btn-banner:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

/* ===== About Summary (Home) ===== */
.about-summary {
    padding: 80px 0;
}

.about-summary .about-image {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.about-summary .about-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.about-summary .about-text { padding-left: 40px; }

.about-summary .about-text h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    margin: 0 0 20px;
}

.about-summary .about-text h2 span { color: var(--primary); }

.about-summary .about-text p {
    color: var(--text-gray);
    line-height: 1.8;
    margin: 0 0 20px;
}

.about-summary .about-text .btn-more {
    display: inline-block;
    padding: 12px 30px;
    background: var(--primary);
    color: var(--white);
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.about-summary .about-text .btn-more:hover {
    background: var(--primary-dark);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,85,179,0.3);
}

/* ===== Product Grid ===== */
.product-grid,
.case-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.product-card,
.case-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
    transition: all 0.3s ease;
}

.product-card:hover,
.case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.product-card .card-image,
.case-card .card-image {
    height: 220px;
    overflow: hidden;
}

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

.product-card:hover .card-image img,
.case-card:hover .card-image img { transform: scale(1.1); }

.product-card .card-body,
.case-card .card-body { padding: 20px; }

.product-card .card-body h3,
.case-card .card-body h3 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.product-card .card-body h3 a,
.case-card .card-body h3 a { color: var(--text-dark); }
.product-card .card-body h3 a:hover,
.case-card .card-body h3 a:hover { color: var(--primary); }

.product-card .card-body p,
.case-card .card-body p {
    color: var(--text-gray);
    font-size: 13px;
    line-height: 1.6;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===== News List ===== */
.news-list { list-style: none; padding: 0; margin: 0; }

.news-list li {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
}

.news-list li:first-child { padding-top: 0; }

.news-list .news-date {
    min-width: 70px;
    text-align: center;
    margin-right: 20px;
}

.news-list .news-date .day {
    font-size: 30px;
    font-weight: 700;
    color: var(--primary);
    display: block;
    line-height: 1.2;
}

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

.news-list .news-info { flex: 1; }

.news-list .news-info h4 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 6px;
}

.news-list .news-info h4 a { color: var(--text-dark); }
.news-list .news-info h4 a:hover { color: var(--primary); }

.news-list .news-info p {
    color: var(--text-gray);
    font-size: 14px;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===== News Card Layout (with thumbnail) ===== */
.news-list-card { list-style: none; padding: 0; margin: 0; }

.news-list-card li {
    margin-bottom: 20px;
}

.news-card-link {
    display: block;
    color: var(--text-dark);
    text-decoration: none;
    transition: all 0.3s ease;
}

.news-card-link:hover {
    color: var(--text-dark);
}

.news-card {
    display: flex;
    width: 100%;
    background: var(--white);
    border-radius: 10px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.news-card:hover {
    box-shadow: 0 5px 25px rgba(0,85,179,0.12);
    border-color: var(--primary-light);
    transform: translateY(-2px);
}

.news-thumb {
    width: 240px;
    min-height: 180px;
    flex-shrink: 0;
    overflow: hidden;
    background: var(--primary-bg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.news-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.news-thumb-default {
    width: 100%;
    height: 100%;
    min-height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-light);
    font-size: 48px;
    opacity: 0.4;
}

.news-card-body {
    flex: 1;
    padding: 25px 28px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.news-card-body .news-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 10px;
    font-size: 13px;
    color: var(--text-light);
}

.news-card-body .news-meta .news-category {
    display: inline-block;
    background: var(--primary-bg);
    color: var(--primary);
    padding: 2px 12px;
    border-radius: 3px;
    font-size: 12px;
}

.news-card-body h4 {
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 10px;
    line-height: 1.5;
    color: var(--text-dark);
}

.news-card-link:hover .news-card-body h4 {
    color: var(--primary);
}

.news-card-body p {
    font-size: 14px;
    color: var(--text-gray);
    margin: 0 0 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.6;
}

.news-read-more {
    font-size: 13px;
    color: var(--primary-light);
    font-weight: 500;
}

.news-read-more i {
    transition: transform 0.3s ease;
}

.news-card-link:hover .news-read-more i {
    transform: translateX(4px);
}

/* Detail Page Prev/Next */
.detail-pn {
    margin-top: 40px;
    padding-top: 25px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

.pn-item {
    flex: 1;
    padding: 15px 20px;
    background: var(--bg-gray);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.pn-item:hover {
    border-color: var(--primary-light);
    background: var(--primary-bg);
}

.pn-item a {
    color: var(--text-dark);
    text-decoration: none;
    display: block;
}

.pn-label {
    font-size: 13px;
    color: var(--text-light);
    display: block;
    margin-bottom: 4px;
}

.pn-title {
    font-size: 14px;
    font-weight: 500;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.pn-prev { text-align: left; }
.pn-next { text-align: right; }

@media (max-width: 767px) {
    .news-card {
        flex-direction: column;
    }
    .news-thumb {
        width: 100%;
        min-height: 200px;
    }
    .news-thumb img {
        height: 200px;
    }
    .news-thumb-default {
        min-height: 140px;
        font-size: 36px;
    }
    .news-card-body {
        padding: 18px;
    }
    .news-card-body h4 {
        font-size: 16px;
    }
    .detail-pn {
        flex-direction: column;
    }
    .pn-prev, .pn-next { text-align: left; }
}

/* ===== Sidebar ===== */
.sidebar .widget {
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
    margin-bottom: 25px;
    overflow: hidden;
}

.sidebar .widget-title {
    padding: 18px 20px;
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    background: var(--primary);
    margin: 0;
}

.sidebar .widget-body { padding: 15px 0; }

.sidebar .category-list { list-style: none; padding: 0; margin: 0; }

.sidebar .category-list li { border-bottom: 1px solid var(--border-color); }

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

.sidebar .category-list li a {
    display: block;
    padding: 12px 20px;
    color: var(--text-gray);
    transition: all 0.3s ease;
    position: relative;
}

.sidebar .category-list li a::before {
    content: '›';
    margin-right: 8px;
    font-weight: 700;
}

.sidebar .category-list li a:hover,
.sidebar .category-list li.active a {
    color: var(--primary);
    background: var(--primary-bg);
    padding-left: 25px;
}

.sidebar .contact-info { padding: 20px; }

.sidebar .contact-info p {
    margin: 0 0 10px;
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.6;
}

.sidebar .contact-info p i {
    width: 20px;
    color: var(--primary);
    margin-right: 5px;
}

/* ===== Content Page ===== */
.content-page {
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
    padding: 40px;
    min-height: 400px;
}

.content-page .page-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin: 0 0 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.content-page .page-content { color: var(--text-gray); line-height: 2; }

.content-page .page-content img { max-width: 100%; height: auto; margin: 15px 0; border-radius: 4px; }

.content-page .page-content p { margin: 0 0 15px; }

/* ===== Detail Page ===== */
.detail-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-dark);
    margin: 0 0 15px;
    text-align: center;
}

.detail-meta {
    text-align: center;
    color: var(--text-light);
    font-size: 13px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.detail-meta span { margin-right: 20px; }

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

.detail-content { color: var(--text-gray); line-height: 2; }

.detail-content img { max-width: 100%; height: auto; margin: 15px 0; border-radius: 4px; }

.detail-content p { margin: 0 0 15px; }

/* ===== Product Detail ===== */
.product-gallery {
    border-radius: 8px;
    overflow: hidden;
}

.product-gallery .main-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 8px;
}

.product-params {
    margin: 25px 0;
}

.product-params table { width: 100%; border-collapse: collapse; }

.product-params table th,
.product-params table td {
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    font-size: 14px;
}

.product-params table th {
    background: var(--bg-gray);
    font-weight: 600;
    color: var(--text-dark);
    width: 120px;
}

/* ===== Contact Page ===== */
.contact-info-section { margin-bottom: 40px; }

.contact-info-section .info-item {
    text-align: center;
    padding: 30px 20px;
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
    transition: all 0.3s ease;
}

.contact-info-section .info-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.contact-info-section .info-item .icon {
    width: 60px;
    height: 60px;
    line-height: 60px;
    border-radius: 50%;
    background: var(--primary-bg);
    color: var(--primary);
    font-size: 24px;
    margin: 0 auto 15px;
}

.contact-info-section .info-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 8px;
}

.contact-info-section .info-item p {
    color: var(--text-gray);
    margin: 0;
    font-size: 14px;
}

/* ===== Contact Form ===== */
.contact-form-section {
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
    padding: 40px;
}

.contact-form-section h3 {
    font-size: 20px;
    font-weight: 600;
    margin: 0 0 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.contact-form-section .form-control {
    height: 45px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    font-size: 14px;
    transition: all 0.3s ease;
}

.contact-form-section .form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0,85,179,0.1);
}

.contact-form-section textarea.form-control { height: 130px; resize: vertical; }

.contact-form-section .btn-submit {
    padding: 12px 40px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.contact-form-section .btn-submit:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,85,179,0.3);
}

/* ===== Pagination ===== */
.pagination { margin-top: 40px; justify-content: center; }

.pagination > li > a,
.pagination > li > span {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    color: var(--text-gray);
    margin: 0 3px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.pagination > li > a:hover,
.pagination > li.active > a,
.pagination > li.active > span {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
}

/* ===== Footer ===== */
.enterprise-footer {
    background: #1a1a2e;
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}

.enterprise-footer h4 {
    color: var(--white);
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 20px;
    position: relative;
    padding-bottom: 12px;
}

.enterprise-footer h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 35px;
    height: 2px;
    background: var(--primary-light);
}

.enterprise-footer p { margin: 0 0 8px; font-size: 14px; line-height: 1.8; }

.enterprise-footer a { color: rgba(255,255,255,0.7); }
.enterprise-footer a:hover { color: var(--white); }

.enterprise-footer .footer-links { list-style: none; padding: 0; margin: 0; }

.enterprise-footer .footer-links li { margin-bottom: 8px; }

.enterprise-footer .footer-links li a {
    font-size: 14px;
    transition: all 0.3s ease;
}

.enterprise-footer .footer-links li a::before {
    content: '› ';
    color: var(--primary-light);
}

.enterprise-footer .footer-contact i {
    width: 20px;
    margin-right: 8px;
    color: var(--primary-light);
}

.enterprise-footer .footer-bottom {
    margin-top: 40px;
    padding: 20px 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    font-size: 13px;
}

/* ===== Product Category Filter ===== */
.category-filter {
    margin-bottom: 30px;
    text-align: center;
}

.category-filter .btn-filter {
    display: inline-block;
    padding: 8px 22px;
    margin: 0 4px 8px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-gray);
    font-size: 14px;
    background: var(--white);
    transition: all 0.3s ease;
    cursor: pointer;
}

.category-filter .btn-filter:hover,
.category-filter .btn-filter.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

/* ===== About Page ===== */
.about-content { max-width: 900px; margin: 0 auto; }

.about-content .about-section { margin-bottom: 40px; }

.about-content .about-section h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
    margin: 0 0 20px;
    padding-left: 15px;
    border-left: 4px solid var(--primary);
}

.about-content .about-section p {
    color: var(--text-gray);
    line-height: 2;
    text-indent: 2em;
}

/* ===== Responsive ===== */
@media (max-width: 991px) {
    .product-grid,
    .case-grid { grid-template-columns: repeat(2, 1fr); }
    .about-summary .about-text { padding-left: 0; margin-top: 25px; }
}

@media (max-width: 767px) {
    body { padding-top: 60px; }
    .enterprise-header { height: 60px; }
    .enterprise-header .header-inner { height: 60px; }
    .enterprise-header .logo-text { font-size: 16px; letter-spacing: 1px; }
    .enterprise-header .logo-sub { display: none; }
    .main-nav > li > a { padding: 0 10px; font-size: 13px; height: 60px; line-height: 60px; }
    .hero-banner { height: 350px; }
    .hero-banner .banner-content h1 { font-size: 28px; }
    .hero-banner .banner-content p { font-size: 15px; }
    .section { padding: 50px 0; }
    .section-title h2 { font-size: 24px; }
    .page-banner { padding: 40px 0; }
    .page-banner h1 { font-size: 24px; }
    .product-grid,
    .case-grid { grid-template-columns: repeat(2, 1fr); gap: 15px; }
    .product-card .card-image,
    .case-card .card-image { height: 160px; }
    .content-page,
    .contact-form-section { padding: 20px; }
    .news-list li { flex-direction: column; }
    .news-list .news-date { display: flex; align-items: center; gap: 8px; margin: 0 0 10px; }
    .news-list .news-date .day { font-size: 20px; }
    .enterprise-footer { padding: 40px 0 0; }
    .enterprise-footer .footer-bottom { margin-top: 25px; }
}

@media (max-width: 480px) {
    .product-grid,
    .case-grid { grid-template-columns: 1fr; }
}