/* ===== 金溴新材料官网 - 样式表 ===== */
/* 设计风格：深蓝商务风，精致现代 */

:root {
    --primary: #0A2463;
    --primary-light: #1E3A8A;
    --primary-dark: #051441;
    --accent: #D4AF37;
    --accent-light: #F0D060;
    --text: #1F2937;
    --text-light: #6B7280;
    --text-lighter: #9CA3AF;
    --bg: #FFFFFF;
    --bg-gray: #F8FAFC;
    --bg-dark: #0A2463;
    --border: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 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);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

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

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

ul {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--primary-dark);
}

/* ===== 顶部导航 ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: #fff;
    box-shadow: var(--shadow-sm);
}

.header-top {
    background: var(--primary-dark);
    color: rgba(255,255,255,0.8);
    font-size: 13px;
    padding: 8px 0;
}

.header-top .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-top a {
    color: var(--accent-light);
    font-weight: 500;
}

.header-top a:hover {
    color: #fff;
}

.header-main {
    padding: 15px 0;
    background: #fff;
    transition: var(--transition);
}

.header-main .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo h1 {
    font-size: 22px;
    color: var(--primary);
    margin: 0;
    font-weight: 800;
    letter-spacing: 0.5px;
}

.logo p {
    font-size: 11px;
    color: var(--text-light);
    margin: 2px 0 0 0;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.nav ul {
    display: flex;
    gap: 35px;
}

.nav a {
    color: var(--text);
    font-weight: 500;
    font-size: 15px;
    position: relative;
    padding: 5px 0;
}

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

.nav a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

/* ===== Hero区域 ===== */
.hero {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
    color: #fff;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
    border-radius: 50%;
}

.hero .container {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-content {
    flex: 1;
}

.hero-badge {
    display: inline-block;
    background: rgba(212, 175, 55, 0.2);
    color: var(--accent-light);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 20px;
    border: 1px solid rgba(212, 175, 55, 0.3);
}

.hero h1 {
    font-size: 42px;
    color: #fff;
    margin-bottom: 20px;
    line-height: 1.2;
    font-weight: 800;
}

.hero h1 span {
    color: var(--accent-light);
}

.hero p {
    font-size: 18px;
    color: rgba(255,255,255,0.85);
    margin-bottom: 35px;
    line-height: 1.8;
    max-width: 550px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.hero-image {
    flex: 1;
    text-align: center;
    font-size: 200px;
    opacity: 0.9;
    filter: drop-shadow(0 20px 40px rgba(0,0,0,0.3));
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, #C9A227 100%);
    color: var(--primary-dark);
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(212, 175, 55, 0.5);
    color: var(--primary-dark);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,0.5);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: #fff;
    color: #fff;
}

.btn-secondary {
    background: var(--primary);
    color: #fff;
}

.btn-secondary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: #fff;
}

/* ===== 通用区块 ===== */
.section {
    padding: 80px 0;
}

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

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 32px;
    color: var(--primary);
    margin-bottom: 12px;
    font-weight: 800;
}

.section-header p {
    font-size: 16px;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

.section-header h2::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background: var(--accent);
    margin: 15px auto 0;
    border-radius: 2px;
}

/* ===== 四大优势 ===== */
.advantages {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.advantage-card {
    background: #fff;
    padding: 35px 25px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transition: var(--transition);
}

.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.advantage-card:hover::before {
    transform: scaleX(1);
}

.advantage-icon {
    font-size: 48px;
    margin-bottom: 20px;
    display: inline-block;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.advantage-card h3 {
    font-size: 18px;
    color: var(--primary);
    margin-bottom: 12px;
    font-weight: 700;
}

.advantage-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== 产品卡片 ===== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.product-card {
    background: #fff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.product-image {
    background: linear-gradient(135deg, var(--bg-gray) 0%, #E8EDF5 100%);
    padding: 40px 20px;
    text-align: center;
    font-size: 60px;
    transition: var(--transition);
}

.product-card:hover .product-image {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
}

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

.product-info {
    padding: 20px;
}

.product-info h3 {
    font-size: 17px;
    color: var(--primary);
    margin-bottom: 8px;
    font-weight: 700;
}

.product-info p {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 15px;
    min-height: 40px;
}

.product-link {
    font-size: 13px;
    color: var(--accent);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.product-link:hover {
    gap: 8px;
    color: var(--primary);
}

/* ===== 产品筛选 ===== */
.product-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
    justify-content: center;
}

.filter-btn {
    padding: 8px 20px;
    border: 1px solid var(--border);
    background: #fff;
    border-radius: 20px;
    font-size: 14px;
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.filter-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ===== 应用领域 ===== */
.applications {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.application-card {
    background: #fff;
    padding: 30px 25px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.application-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.application-icon {
    font-size: 42px;
    margin-bottom: 15px;
}

.application-card h3 {
    font-size: 17px;
    color: var(--primary);
    margin-bottom: 10px;
    font-weight: 700;
}

.application-card p {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== 图片网格 ===== */
.gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.gallery-item {
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    aspect-ratio: 4/3;
    background: var(--bg-gray);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-item::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(10, 36, 99, 0.7) 0%, transparent 50%);
    opacity: 0;
    transition: var(--transition);
}

.gallery-item:hover::after {
    opacity: 1;
}

/* ===== 出口资质 ===== */
.export-section {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: #fff;
}

.export-section .section-header h2 {
    color: #fff;
}

.export-section .section-header p {
    color: rgba(255,255,255,0.7);
}

.export-items {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 20px;
}

.export-item {
    text-align: center;
    padding: 25px 15px;
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.1);
}

.export-item:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-5px);
}

.export-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.export-item h4 {
    font-size: 14px;
    color: #fff;
    font-weight: 600;
}

/* ===== CTA区块 ===== */
.cta-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    text-align: center;
    padding: 60px 0;
}

.cta-section h2 {
    font-size: 28px;
    color: #fff;
    margin-bottom: 15px;
}

.cta-section p {
    font-size: 16px;
    color: rgba(255,255,255,0.8);
    margin-bottom: 30px;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--primary-dark);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-about h3 {
    color: #fff;
    font-size: 18px;
    margin-bottom: 15px;
    font-weight: 700;
}

.footer-about p {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255,255,255,0.6);
}

.footer h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 20px;
    font-weight: 600;
}

.footer ul li {
    margin-bottom: 10px;
}

.footer ul li a {
    color: rgba(255,255,255,0.6);
    font-size: 14px;
    transition: var(--transition);
}

.footer ul li a:hover {
    color: var(--accent-light);
    padding-left: 5px;
}

.footer-contact p {
    font-size: 14px;
    margin-bottom: 10px;
    line-height: 1.7;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

/* ===== 面包屑 ===== */
.breadcrumb {
    background: var(--bg-gray);
    padding: 15px 0;
    font-size: 14px;
    color: var(--text-light);
    border-bottom: 1px solid var(--border);
}

.breadcrumb a {
    color: var(--text-light);
}

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

.breadcrumb span {
    margin: 0 8px;
    color: var(--text-lighter);
}

/* ===== 页面标题 ===== */
.page-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: #fff;
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.page-header h1 {
    font-size: 36px;
    color: #fff;
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
    font-weight: 800;
}

.page-header p {
    font-size: 16px;
    color: rgba(255,255,255,0.7);
    position: relative;
    z-index: 1;
}

/* ===== 产品详情 ===== */
.product-detail {
    display: flex;
    gap: 50px;
    margin-bottom: 60px;
    align-items: flex-start;
}

.product-detail-image {
    flex: 1;
    background: linear-gradient(135deg, var(--bg-gray) 0%, #E8EDF5 100%);
    border-radius: var(--radius-xl);
    padding: 60px 40px;
    text-align: center;
    font-size: 150px;
    position: sticky;
    top: 100px;
}

.product-detail-info {
    flex: 1;
}

.product-detail-info h1 {
    font-size: 32px;
    color: var(--primary);
    margin-bottom: 8px;
    font-weight: 800;
}

.subtitle {
    font-size: 15px;
    color: var(--text-light);
    margin-bottom: 30px;
}

.product-specs {
    background: var(--bg-gray);
    border-radius: var(--radius-lg);
    padding: 25px;
    margin-bottom: 30px;
}

.product-specs h3 {
    font-size: 18px;
    color: var(--primary);
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--accent);
    display: inline-block;
    font-weight: 700;
}

.spec-item {
    display: flex;
    padding: 10px 0;
    border-bottom: 1px dashed var(--border);
    font-size: 14px;
}

.spec-item:last-child {
    border-bottom: none;
}

.spec-label {
    width: 100px;
    color: var(--text-light);
    font-weight: 500;
}

.spec-value {
    flex: 1;
    color: var(--text);
    font-weight: 600;
}

.product-cta {
    display: flex;
    gap: 15px;
}

.product-content {
    border-top: 1px solid var(--border);
    padding-top: 50px;
}

.product-content h2 {
    font-size: 24px;
    color: var(--primary);
    margin: 40px 0 20px;
    padding-left: 15px;
    border-left: 4px solid var(--accent);
    font-weight: 700;
}

.product-content h2:first-child {
    margin-top: 0;
}

.product-content h3 {
    font-size: 18px;
    color: var(--primary-light);
    margin: 25px 0 12px;
    font-weight: 600;
}

.product-content p {
    margin-bottom: 15px;
    line-height: 1.9;
    color: var(--text);
}

.product-content ul {
    margin-bottom: 15px;
    padding-left: 25px;
}

.product-content ul li {
    margin-bottom: 10px;
    line-height: 1.8;
    list-style: disc;
    color: var(--text);
}

.product-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.product-content th {
    background: var(--primary);
    color: #fff;
    padding: 12px 15px;
    text-align: left;
    font-weight: 600;
}

.product-content td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--border);
}

.product-content tr:last-child td {
    border-bottom: none;
}

.product-content tr:hover td {
    background: var(--bg-gray);
}

/* ===== 关于我们 ===== */
.about-content {
    display: flex;
    gap: 50px;
    align-items: center;
}

.about-text {
    flex: 1;
}

.about-text h2 {
    font-size: 28px;
    color: var(--primary);
    margin-bottom: 25px;
    font-weight: 800;
}

.about-text p {
    margin-bottom: 18px;
    line-height: 1.9;
    color: var(--text);
    font-size: 15px;
}

.about-image {
    flex: 1;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.about-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* ===== 资质证书 ===== */
.certificates {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.certificate-card {
    background: #fff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.certificate-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.certificate-card img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    background: var(--bg-gray);
}

.certificate-card h3 {
    padding: 20px 20px 10px;
    font-size: 17px;
    color: var(--primary);
    font-weight: 700;
}

.certificate-card p {
    padding: 0 20px 20px;
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== FAQ（旧 .faq-question 折叠面板样式已移除，统一使用下方 <details> 原生折叠版）===== */

/* ===== 联系我们 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info h2,
.contact-form h2 {
    font-size: 26px;
    color: var(--primary);
    margin-bottom: 15px;
    font-weight: 800;
}

.contact-item {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
    padding: 20px;
    background: var(--bg-gray);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-sm);
}

.contact-icon {
    font-size: 28px;
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
}

.contact-item h3 {
    font-size: 16px;
    color: var(--primary);
    margin-bottom: 5px;
    font-weight: 700;
}

.contact-item p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

.contact-form {
    background: #fff;
    padding: 35px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(10, 36, 99, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===== 新闻列表 ===== */
.news-list {
    max-width: 900px;
    margin: 0 auto;
}

.news-item {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 30px;
    margin-bottom: 25px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.news-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.news-meta {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.news-item h2 {
    font-size: 20px;
    color: var(--primary);
    margin-bottom: 15px;
    font-weight: 700;
}

.news-item p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 15px;
    font-size: 14px;
}

.news-item a {
    color: var(--accent);
    font-weight: 600;
    font-size: 14px;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .advantages,
    .products-grid,
    .applications {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .export-items {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero p {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-image {
        font-size: 150px;
    }
    
    .product-detail {
        flex-direction: column;
    }
    
    .product-detail-image {
        position: static;
    }
    
    .about-content {
        flex-direction: column;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .gallery {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .section {
        padding: 50px 0;
    }
    
    .hero {
        padding: 50px 0;
    }
    
    .hero h1 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .section-header h2 {
        font-size: 24px;
    }
    
    .advantages,
    .products-grid,
    .applications,
    .certificates {
        grid-template-columns: 1fr;
    }
    
    .export-items {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .nav ul {
        gap: 15px;
    }
    
    .nav a {
        font-size: 13px;
    }
    
    .logo h1 {
        font-size: 18px;
    }
    
    .logo p {
        display: none;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .gallery {
        grid-template-columns: 1fr;
    }
    
    .page-header h1 {
        font-size: 28px;
    }
    
    .product-detail-info h1 {
        font-size: 24px;
    }
    
    .product-content h2 {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .header-top {
        display: none;
    }
    
    .hero h1 {
        font-size: 24px;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }
    
    .export-items {
        grid-template-columns: 1fr 1fr;
    }
}

/* 备案信息页脚样式（工信部 + 公安） */
.footer-bottom .beian {
    margin-top: 8px;
    font-size: 13px;
    color: var(--sub, #5b6675);
    line-height: 2;
}
.footer-bottom .beian a {
    color: var(--sub, #5b6675);
    text-decoration: none;
    margin: 0 10px;
    display: inline-flex;
    align-items: center;
}
.footer-bottom .beian a:hover {
    color: var(--blue, #2563eb);
    text-decoration: underline;
}
.footer-bottom .beian-icon {
    width: 18px;
    height: 18px;
    margin-right: 5px;
    vertical-align: middle;
}

/* 产品页 banner 公司名（原为 h1，已降为 div 以符合单 h1 语义） */
.hero-brand {
    font-size: 2em;
    font-weight: 700;
    margin: 0;
    line-height: 1.2;
}

/* ===== FAQ 常见问题 ===== */
.faq-section { background: var(--bg); }
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
    background: var(--bg-gray);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 14px;
    overflow: hidden;
    transition: var(--transition);
}
.faq-item[open] { border-color: var(--primary); box-shadow: var(--shadow); }
.faq-item summary {
    cursor: pointer;
    list-style: none;
    padding: 18px 48px 18px 22px;
    font-size: 17px;
    font-weight: 600;
    color: var(--primary-dark);
    position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: "+";
    position: absolute;
    right: 22px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 26px;
    font-weight: 700;
    line-height: 1;
    color: var(--primary);
}
.faq-item[open] summary::after { content: "\2212"; }
.faq-answer {
    display: block;
    padding: 0 22px 18px;
    color: var(--text);
    font-size: 15px;
    line-height: 1.8;
}