/* style.css - 荣朗防爆科技 工业美学重制版 v6.0 (优化版) */
:root {
    --primary-blue: #0A2A44;
    --secondary-steel: #2C4C6F;
    --safety-orange: #E67E22;
    --industrial-blue: #2980B9;
    --metal-gray: #B0BEC5;
    --light-bg: #F5F7FA;
    --dark-text: #1E2F3F;
    --border-color: #D0D7DE;
    --gray-100: #F8F9FA;
    --gray-300: #E0E4E8;
    --gray-500: #ADB5BD;
    --gray-700: #495057;
    --gray-900: #1A1A1A;
    --card-shadow: 0 0.625rem 1.5625rem -0.5rem rgba(0, 0, 0, 0.2);
    --hover-shadow: 0 1.25rem 2.1875rem -0.625rem rgba(230, 126, 34, 0.3);
    --transition: all 0.25s cubic-bezier(0.2, 0, 0, 1);
    --border-radius: 0.25rem;
    --font-sans: 'Noto Sans SC', 'Roboto', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --grid-gap: 1.5rem;
    --container-padding: 2rem;
}

/* 材质纹理：全局背景叠加金属拉丝效果 */
body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--gray-700);
    background-color: #fff;
    background-image: 
        repeating-linear-gradient(45deg, 
            rgba(0, 0, 0, 0.015) 0px, 
            rgba(0, 0, 0, 0.015) 2px, 
            transparent 2px, 
            transparent 6px);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 80rem;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* 表格响应式容器 */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 1rem;
}
.table-responsive table {
    width: 100%;
    min-width: 600px;
}

/* ========== 头部导航 ========== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--primary-blue);
    box-shadow: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.3);
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 0.125rem solid var(--safety-orange);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    height: 4.375rem;
}

.logo {
    display: flex;
    align-items: flex-end;
    gap: 0.75rem;
    text-decoration: none;
}
.logo:hover { opacity: 0.9; }

.logo-img {
    height: 3rem;
    width: auto;
    filter: drop-shadow(0 0.125rem 0.375rem rgba(0,0,0,0.5));
}

.company-tagline {
    font-size: 0.9375rem;
    color: rgba(255,255,255,0.8);
    letter-spacing: 0.03125rem;
    text-transform: uppercase;
    line-height: 1.2;
    font-weight: 400;
}

.nav-container {
    display: flex;
    align-items: center;
}

.main-menu {
    display: flex;
    list-style: none;
    margin-right: 1.875rem;
}
.main-menu > li {
    margin-left: 0.5rem;
    position: relative;
}
.main-menu > li > a {
    text-decoration: none;
    color: rgba(255,255,255,0.9);
    font-weight: 500;
    font-size: 1rem;
    padding: 0.5rem 0.75rem;
    transition: var(--transition);
    display: block;
    border-radius: 0;
    position: relative;
}
.main-menu > li > a:hover,
.main-menu > li.active > a {
    color: white;
    background: rgba(255,255,255,0.05);
}
.main-menu > li > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0.75rem;
    right: 0.75rem;
    height: 0.1875rem;
    background: var(--safety-orange);
    transform: scaleX(0);
    transition: transform 0.25s;
}
.main-menu > li > a:hover::after,
.main-menu > li.active > a::after {
    transform: scaleX(1);
}

/* 下拉菜单 */
.dropdown-content {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 15rem;
    box-shadow: var(--card-shadow);
    padding: 1rem 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(0.5rem);
    transition: all 0.25s;
    z-index: 1000;
    border: 0.0625rem solid var(--border-color);
    border-top: 0.1875rem solid var(--safety-orange);
}
.dropdown:hover .dropdown-content {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.dropdown-section {
    padding: 0 1.25rem;
}
.dropdown-section a {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    color: var(--dark-text);
    text-decoration: none;
    padding: 0.625rem 0;
    font-size: 0.875rem;
    transition: var(--transition);
    border-bottom: 0.0625rem solid var(--border-color);
}
.dropdown-section a:last-child { border-bottom: none; }
.dropdown-section a:hover {
    background: rgba(230,126,34,0.05);
    color: var(--safety-orange);
    padding-left: 0.9375rem;
}
.dropdown-section a i {
    width: 1.25rem;
    color: var(--safety-orange);
    font-size: 1rem;
}

.header-cta .phone-number {
    display: flex;
    align-items: center;
    background: var(--safety-orange);
    color: white;
    padding: 0.5rem 1.375rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    border-radius: 0;
    box-shadow: 0 0.25rem 0.75rem rgba(230,126,34,0.4);
    letter-spacing: 0.03125rem;
}
.phone-number:hover {
    background: #c35f1a;
    transform: translateY(-0.125rem);
    box-shadow: 0 0.5rem 1.125rem rgba(230,126,34,0.6);
}
.phone-number i { margin-right: 0.5rem; }

.mobile-menu-btn {
    display: none;
    background: rgba(255,255,255,0.15);
    border: none;
    font-size: 1.625rem;
    color: white;
    cursor: pointer;
    width: 3.25rem;
    height: 3.25rem;
    border-radius: 0;
    transition: var(--transition);
}
.mobile-menu-btn:hover { background: rgba(255,255,255,0.25); }

/* ========== 英雄区域 ========== */
.hero {
    padding: 10rem 0 7.5rem;
    background: linear-gradient(135deg, #0A2A44 0%, #1A4A6F 100%);
    color: white;
    position: relative;
    overflow: hidden;
    border-bottom: 0.25rem solid var(--safety-orange);
}
.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-image: 
        linear-gradient(rgba(255,255,255,0.02) 0.0625rem, transparent 0.0625rem),
        linear-gradient(90deg, rgba(255,255,255,0.02) 0.0625rem, transparent 0.0625rem);
    background-size: 2.5rem 2.5rem;
    pointer-events: none;
}
.hero::after {
    content: '';
    position: absolute;
    top: -20%; right: -5%;
    width: 37.5rem;
    height: 37.5rem;
    background: radial-gradient(circle, rgba(230,126,34,0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.hero-image {
    position: absolute;
    bottom: 0; right: 3%;
    width: 38%; max-width: 37.5rem;
    z-index: 2;
    opacity: 0.9;
    pointer-events: none;
}
.hero-image img {
    width: 100%; height: auto;
    filter: drop-shadow(0 1.25rem 1.5625rem rgba(0,0,0,0.6));
}
.hero-content {
    position: relative; z-index: 2;
    max-width: 46.875rem;
}
.hero h1 {
    font-size: 3rem;
    font-weight: 700; line-height: 1.2;
    margin-bottom: 1.25rem;
    color: white;
    text-transform: uppercase;
}
.hero h1 .highlight {
    color: var(--safety-orange);
    position: relative;
    display: inline-block;
    border-bottom: 0.25rem solid rgba(230,126,34,0.5);
    padding-bottom: 0.25rem;
}
.hero p {
    font-size: 1.125rem;
    margin-bottom: 2.1875rem;
    max-width: 40.625rem;
    opacity: 0.95;
    border-left: 0.25rem solid var(--safety-orange);
    padding-left: 1.25rem;
}
.hero-buttons { display: flex; gap: 1.25rem; }

/* ========== 通用标题 ========== */
.section-title {
    text-align: center; margin-bottom: 3.75rem;
}
.section-title h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 1rem;
    position: relative; display: inline-block;
    text-transform: uppercase;
    letter-spacing: 0.0625rem;
}
.section-title h2 i {
    color: var(--safety-orange);
    margin-right: 0.625rem;
}
.section-title h2::after {
    content: '';
    position: absolute;
    width: 5rem;
    height: 0.25rem;
    background: var(--safety-orange);
    bottom: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
}
.section-title p {
    color: var(--secondary-steel);
    max-width: 43.75rem;
    margin: 1.5rem auto 0;
    font-size: 1.125rem;
    border-top: 0.0625rem solid var(--border-color);
    padding-top: 1.25rem;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 0.875rem 2.25rem;
    text-decoration: none; font-weight: 600;
    font-size: 1rem; transition: var(--transition); border: none;
    cursor: pointer; border-radius: 0;
    letter-spacing: 0.03125rem;
    gap: 0.5rem;
    text-transform: uppercase;
}
.btn-primary {
    background: var(--safety-orange); color: white;
    box-shadow: 0 0.25rem 0.75rem rgba(230,126,34,0.4);
}
.btn-primary:hover {
    background: #c35f1a; transform: translateY(-0.1875rem);
    box-shadow: 0 0.5rem 1.25rem rgba(230,126,34,0.6);
}
.btn-secondary {
    background: transparent; color: white;
    border: 0.125rem solid rgba(255,255,255,0.3);
}
.btn-secondary:hover {
    background: rgba(255,255,255,0.1); border-color: white; transform: translateY(-0.1875rem);
}

/* ========== 行业画像卡片 ========== */
.industry-landscape { padding: 6.25rem 0; background: var(--light-bg); }
.landscape-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem,1fr)); gap: var(--grid-gap);
}
.industry-sector {
    background: white; padding: 1.875rem; border: 0.0625rem solid var(--border-color);
    box-shadow: var(--card-shadow); transition: var(--transition);
    border-top: 0.25rem solid transparent;
}
.industry-sector:hover {
    transform: translateY(-0.375rem);
    border-top-color: var(--safety-orange);
    box-shadow: var(--hover-shadow);
}
.sector-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 1.25rem; padding-bottom: 0.9375rem; border-bottom: 0.125rem solid var(--border-color);
}
.industry-sector h3 { font-size: 1.25rem; color: var(--primary-blue); font-weight: 600; }
.sector-percentage {
    background: rgba(230,126,34,0.1); color: var(--safety-orange);
    padding: 0.25rem 0.75rem; font-size: 0.875rem; font-weight: 600; border-radius: 0;
}
.sector-content p { color: var(--secondary-steel); margin-bottom: 1.25rem; font-size: 0.875rem; }
.sector-stats { display: flex; gap: 1.875rem; margin-top: 1.25rem; }
.stat-value {
    display: block; font-size: 1.5rem; font-weight: 700; color: var(--primary-blue);
    line-height: 1.2;
}
.stat-label { font-size: 0.75rem; color: var(--metal-gray); text-transform: uppercase; }

/* ========== 企业介绍 ========== */
.company-introduction { padding: 6.25rem 0; background: white; }
.intro-content {
    display: grid; grid-template-columns: 2fr 1fr; gap: 3.75rem; margin-top: 2.5rem;
}
.intro-text h3 {
    color: var(--primary-blue); margin: 1.875rem 0 0.9375rem; font-size: 1.375rem;
    padding-left: 1.25rem; position: relative; display: flex; align-items: center; gap: 0.625rem;
}
.intro-text h3:first-child { margin-top: 0; }
.intro-text h3 i { color: var(--safety-orange); font-size: 1.5rem; }
.intro-text h3::before {
    content: '';
    position: absolute; left: 0; top: 50%; transform: translateY(-50%);
    width: 0.375rem; height: 1.75rem;
    background: var(--safety-orange);
}
.intro-text p { color: var(--secondary-steel); line-height: 1.9; margin-bottom: 0.9375rem; }
.intro-stats {
    display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem;
}
.stat-item {
    background: var(--light-bg); padding: 1.875rem 1.25rem; text-align: center;
    border: 0.0625rem solid var(--border-color); box-shadow: var(--card-shadow);
    transition: var(--transition);
}
.stat-item:hover {
    transform: translateY(-0.25rem);
    border-color: var(--safety-orange);
}
.stat-number { font-size: 2.125rem; font-weight: 700; color: var(--primary-blue); margin-bottom: 0.5rem; }
.stat-label { font-size: 0.9375rem; color: var(--metal-gray); }

/* ========== 企业名片卡片 ========== */
.company-profile { padding: 6.25rem 0; background: var(--light-bg); }
.profile-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem,1fr)); gap: var(--grid-gap);
}
.profile-card {
    background: white; padding: 1.875rem; border: 0.0625rem solid var(--border-color);
    box-shadow: var(--card-shadow); transition: var(--transition);
    border-left: 0.25rem solid transparent;
}
.profile-card:hover { border-left-color: var(--safety-orange); transform: translateX(0.25rem); }
.profile-card h3 {
    font-size: 1.25rem; color: var(--primary-blue); margin-bottom: 1.5rem;
    padding-bottom: 0.75rem; border-bottom: 0.125rem solid var(--safety-orange);
    display: flex; align-items: center; gap: 0.625rem;
    text-transform: uppercase;
}
.profile-card h3 i { color: var(--safety-orange); }
.profile-content { display: flex; flex-direction: column; gap: 1.125rem; }
.cert-item, .tech-item, .service-item {
    display: flex; flex-direction: column; gap: 0.25rem;
    border-bottom: 0.0625rem dashed var(--border-color); padding-bottom: 0.625rem;
}
.cert-item:last-child, .tech-item:last-child, .service-item:last-child { border-bottom: none; }
.cert-name, .tech-name, .service-name {
    font-weight: 600; color: var(--dark-text); font-size: 0.9375rem;
}
.cert-desc, .tech-desc, .service-desc {
    color: var(--metal-gray); font-size: 0.8125rem;
}
.client-logos {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; margin-bottom: 1.25rem;
}
.client-logo {
    background: var(--light-bg); padding: 0.75rem 0.5rem; font-weight: 600;
    color: var(--primary-blue); text-align: center; border: 0.0625rem solid var(--border-color);
    transition: var(--transition);
}
.client-logo:hover {
    border-color: var(--safety-orange); color: var(--safety-orange);
    background: white;
}
.client-desc { color: var(--metal-gray); font-size: 0.875rem; font-style: italic; }

/* ========== 核心产品系列 ========== */
.products-showcase { padding: 6.25rem 0; background: white; }
.product-features {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(12.5rem,1fr)); gap: 1.875rem;
    margin: 3.125rem 0 4.375rem;
}
.feature-item {
    text-align: center; padding: 1.875rem 1.25rem; background: var(--light-bg);
    border: 0.0625rem solid var(--border-color); box-shadow: var(--card-shadow);
    transition: var(--transition);
}
.feature-item:hover {
    transform: translateY(-0.375rem);
    border-color: var(--safety-orange);
}
.feature-item i { font-size: 2.625rem; color: var(--safety-orange); margin-bottom: 1.125rem; }
.feature-item h4 { font-size: 1.25rem; color: var(--primary-blue); margin-bottom: 0.75rem; }
.feature-item p { color: var(--metal-gray); font-size: 0.875rem; }

.hot-products-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(16.25rem,1fr)); gap: 1.875rem;
    margin-bottom: 2.5rem;
}
.hot-product-card {
    background: white; border: 0.0625rem solid var(--border-color);
    box-shadow: var(--card-shadow); transition: var(--transition);
}
.hot-product-card:hover {
    transform: translateY(-0.5rem); box-shadow: var(--hover-shadow);
    border-color: var(--safety-orange);
}
.product-image {
    height: 13.75rem; overflow: hidden; position: relative; background: #eef2f6;
    border-bottom: 0.0625rem solid var(--border-color);
}
.product-image img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 0.5s;
}
.hot-product-card:hover .product-image img { transform: scale(1.05); }
.product-info { padding: 1.5rem; }
.product-info h3 { font-size: 1.25rem; color: var(--primary-blue); margin-bottom: 0.75rem; }
.product-specs {
    display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem;
}
.product-specs .spec {
    background: rgba(26,58,95,0.08); color: var(--primary-blue);
    padding: 0.25rem 0.75rem; font-size: 0.75rem; border-radius: 0;
}
.product-info p { color: var(--secondary-steel); margin-bottom: 1rem; font-size: 0.875rem; }
.product-tags {
    display: flex; flex-wrap: wrap; gap: 0.5rem;
}
.product-tags .tag {
    background: rgba(230,126,34,0.1); color: var(--safety-orange);
    padding: 0.25rem 0.625rem; font-size: 0.6875rem; border-radius: 0; font-weight: 500;
}

/* 文章卡片网格 */
.article-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(16.25rem,1fr)); gap: 1.875rem;
    margin: 1.875rem 0 3.125rem;
}
.article-card {
    background: white; padding: 1.75rem 1.375rem;
    border: 0.0625rem solid var(--border-color);
    box-shadow: var(--card-shadow); transition: var(--transition);
    position: relative; overflow: hidden;
    display: flex; flex-direction: column;
}
.article-card:hover {
    transform: translateY(-0.25rem); border-color: var(--safety-orange);
}
.article-card::before {
    content: '';
    position: absolute; top: 0; left: 0; width: 0.25rem; height: 100%;
    background: var(--safety-orange);
    opacity: 0; transition: opacity 0.25s;
}
.article-card:hover::before { opacity: 1; }
.article-icon { font-size: 2rem; color: var(--safety-orange); margin-bottom: 1.125rem; }
.article-card h5 {
    font-size: 1.125rem; font-weight: 600; color: var(--primary-blue);
    margin-bottom: 0.75rem; line-height: 1.4;
    text-transform: uppercase;
}
.article-card p {
    font-size: 0.875rem; color: var(--metal-gray); margin-bottom: 1.25rem;
    line-height: 1.6; flex: 1;
}
.article-link {
    display: inline-flex; align-items: center; gap: 0.375rem;
    color: var(--safety-orange); font-weight: 500; font-size: 0.875rem;
    text-decoration: none; transition: gap 0.3s; margin-top: auto;
}
.article-link i { font-size: 0.75rem; transition: transform 0.3s; }
.article-link:hover { gap: 0.75rem; }
.article-link:hover i { transform: translateX(0.25rem); }

/* 章节分隔线 */
.section-divider {
    display: flex; align-items: center; gap: 1rem; margin: 3.125rem 0 1.25rem;
}
.section-divider h4 {
    font-size: 1.375rem; color: var(--primary-blue); font-weight: 600;
    white-space: nowrap; margin: 0;
    text-transform: uppercase;
}
.section-divider .line {
    height: 0.125rem; flex: 1; background: linear-gradient(90deg, var(--safety-orange), transparent);
}

/* ========== 行业解决方案 ========== */
.industry-solutions { padding: 6.25rem 0; background: var(--light-bg); }
.needs-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(17.5rem,1fr)); gap: 1.875rem;
}
.need-item {
    background: white; padding: 2.1875rem 1.875rem; border: 0.0625rem solid var(--border-color);
    box-shadow: var(--card-shadow); transition: var(--transition);
}
.need-item:hover {
    transform: translateY(-0.25rem); border-color: var(--safety-orange);
}
.need-icon {
    width: 4.375rem; height: 4.375rem; background: var(--safety-orange);
    display: flex; align-items: center; justify-content: center; margin-bottom: 1.5rem;
    box-shadow: 0 0.25rem 0.75rem rgba(230,126,34,0.3);
}
.need-icon i { color: white; font-size: 1.875rem; }
.need-item h4 { font-size: 1.25rem; color: var(--primary-blue); margin-bottom: 1.125rem; }
.need-item ul { list-style: none; }
.need-item li {
    color: var(--secondary-steel); margin-bottom: 0.625rem; padding-left: 1.375rem;
    position: relative; font-size: 0.9375rem;
}
.need-item li::before {
    content: '▹'; color: var(--safety-orange); position: absolute; left: 0;
}

/* 技术方案标签页 */
.solutions-tabs {
    background: white; border: 0.0625rem solid var(--border-color);
    box-shadow: var(--card-shadow); margin-bottom: 3.125rem;
}
.tab-header {
    display: flex; background: var(--light-bg); border-bottom: 0.0625rem solid var(--border-color);
    flex-wrap: wrap;
}
.tab-btn {
    padding: 1rem 1.5rem; background: none; border: none; font-size: 1rem;
    color: var(--secondary-steel); cursor: pointer; transition: var(--transition);
    flex: 1 1 auto; font-weight: 500; border-right: 0.0625rem solid var(--border-color);
    text-transform: uppercase;
}
.tab-btn:last-child { border-right: none; }
.tab-btn:hover { color: var(--primary-blue); background: white; }
.tab-btn.active {
    color: var(--safety-orange); font-weight: 600; background: white;
    box-shadow: inset 0 -0.1875rem 0 var(--safety-orange);
}
.tab-content { padding: 2.5rem; }
.tab-pane { display: none; }
.tab-pane.active { display: block; animation: fadeIn 0.3s; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.solution-content h4 { font-size: 1.375rem; color: var(--primary-blue); margin-bottom: 1.25rem; }
.solution-content p { color: var(--secondary-steel); margin-bottom: 1.875rem; }
.solution-features {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(9.375rem,1fr)); gap: 1.25rem;
}
.feature {
    text-align: center; padding: 1.25rem 0.9375rem; background: var(--light-bg);
    border: 0.0625rem solid var(--border-color); transition: var(--transition);
}
.feature:hover {
    border-color: var(--safety-orange); background: white; transform: translateY(-0.125rem);
}
.feature i { font-size: 1.75rem; color: var(--safety-orange); margin-bottom: 0.625rem; }
.feature span { font-size: 0.9375rem; color: var(--primary-blue); font-weight: 500; }

/* 工程案例 */
.project-cases { margin-top: 4.375rem; }
.cases-container { display: flex; flex-direction: column; gap: 2.5rem; }
.case-row {
    display: grid; grid-template-columns: 1fr 1fr; gap: 1.875rem; align-items: center;
    background: white; border: 0.0625rem solid var(--border-color);
    box-shadow: var(--card-shadow); transition: var(--transition);
    border-left: 0.375rem solid transparent;
}
.case-row:hover { border-left-color: var(--safety-orange); box-shadow: var(--hover-shadow); }
.case-image { height: 17.5rem; overflow: hidden; }
.case-image img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 0.5s;
}
.case-row:hover .case-image img { transform: scale(1.03); }
.case-content { padding: 1.875rem; }
.case-content h4 { font-size: 1.375rem; color: var(--primary-blue); margin-bottom: 0.75rem; }
.case-meta {
    display: flex; gap: 1.25rem; margin-bottom: 1rem;
}
.case-category {
    background: var(--safety-orange); color: white; padding: 0.25rem 1rem;
    font-size: 0.75rem; font-weight: 600; border-radius: 0;
}
.case-date { color: var(--metal-gray); font-size: 0.875rem; }
.case-content p { color: var(--secondary-steel); margin-bottom: 1.25rem; }
.case-stats {
    display: flex; gap: 1.875rem;
}
.case-stats .stat { text-align: left; }
.case-stats .value {
    display: block; font-size: 1.375rem; font-weight: 700; color: var(--primary-blue);
}
.case-stats .label {
    font-size: 0.75rem; color: var(--metal-gray); text-transform: uppercase;
}

/* ========== CTA区域 ========== */
.cta-section {
    padding: 6.25rem 0; background: linear-gradient(135deg, #0A2A44, #1A4A6F);
    color: white; text-align: center; position: relative; overflow: hidden;
    border-top: 0.25rem solid var(--safety-orange);
    border-bottom: 0.25rem solid var(--safety-orange);
}
.cta-section::before {
    content: '';
    position: absolute; top: -30%; left: -10%;
    width: 37.5rem; height: 37.5rem;
    background: radial-gradient(circle, rgba(230,126,34,0.15) 0%, transparent 70%);
    border-radius: 50%;
}
.cta-content { max-width: 50rem; margin: 0 auto; position: relative; z-index: 2; }
.cta-content h2 { font-size: 2.25rem; margin-bottom: 1.25rem; text-transform: uppercase; }
.cta-content p { font-size: 1.125rem; margin-bottom: 2.5rem; opacity: 0.95; }
.cta-form {
    max-width: 43.75rem; margin: 1.875rem auto; display: flex; flex-wrap: wrap;
    gap: 0.9375rem; justify-content: center;
}
.cta-form input {
    flex: 1 1 12.5rem; padding: 0.875rem 1.25rem; border: 0.0625rem solid rgba(255,255,255,0.3);
    background: rgba(255,255,255,0.1); color: white; font-weight: 500;
    transition: background 0.3s; border-radius: 0;
}
.cta-form input:focus {
    outline: 0.125rem solid var(--safety-orange); background: rgba(255,255,255,0.2);
    border-color: transparent;
}
.cta-form input::placeholder { color: rgba(255,255,255,0.7); }
.cta-buttons { display: flex; justify-content: center; gap: 1.25rem; }

/* ========== 技术问答 ========== */
.technical-qa { padding: 6.25rem 0; background: white; }
.qa-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(20rem,1fr)); gap: 1.875rem;
}
.qa-column {
    background: var(--light-bg); border: 0.0625rem solid var(--border-color);
    box-shadow: var(--card-shadow);
}
.qa-category {
    background: var(--primary-blue); padding: 1.125rem 1.5rem; color: white;
}
.qa-category h3 { font-size: 1.25rem; margin: 0; text-transform: uppercase; }
.qa-category i { margin-right: 0.5rem; }
.qa-item { border-bottom: 0.0625rem solid var(--border-color); background: white; }
.qa-item:last-child { border-bottom: none; }
.qa-question {
    padding: 1.125rem 1.5rem; display: flex; justify-content: space-between;
    align-items: center; cursor: pointer; transition: background 0.2s;
}
.qa-question:hover { background: rgba(230,126,34,0.03); }
.qa-question span { font-weight: 600; color: var(--primary-blue); }
.qa-question i { color: var(--metal-gray); transition: transform 0.3s; }
.qa-item.active .qa-question i { transform: rotate(180deg); color: var(--safety-orange); }
.qa-answer {
    padding: 0 1.5rem; max-height: 0; overflow: hidden;
    transition: all 0.3s ease; background: #fafcfd;
}
.qa-item.active .qa-answer {
    padding: 0 1.5rem 1.5rem; max-height: 18.75rem;
}
.qa-answer p { color: var(--secondary-steel); font-size: 0.875rem; margin-top: 0.5rem; }

/* ========== 底部 ========== */
footer {
    background: var(--primary-blue);
    color: white; padding: 3.75rem 0 1.25rem;
    border-top: 0.3125rem solid var(--safety-orange);
}
.footer-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(12.5rem,1fr)); gap: 2.5rem;
    margin-bottom: 2.5rem;
}
.footer-about .footer-logo-img {
    height: 3.125rem; width: auto; margin-bottom: 1.25rem;
    filter: brightness(0) invert(1);
}
.footer-about p { opacity: 0.8; line-height: 1.8; margin-bottom: 1.25rem; font-size: 0.875rem; }
.social-links { display: flex; gap: 0.9375rem; }
.social-links a {
    display: flex; align-items: center; justify-content: center;
    width: 2.5rem; height: 2.5rem; background: rgba(255,255,255,0.1);
    color: white; font-size: 1.125rem; transition: var(--transition);
    border: 0.0625rem solid rgba(255,255,255,0.2); border-radius: 0;
}
.social-links a:hover {
    background: var(--safety-orange); transform: translateY(-0.25rem);
    border-color: transparent; box-shadow: 0 0.375rem 0.75rem rgba(230,126,34,0.4);
}
.footer-links h3, .footer-contact-info h3 {
    font-size: 1.125rem; margin-bottom: 1.25rem; position: relative; padding-bottom: 0.625rem;
    color: white; font-weight: 600; text-transform: uppercase;
}
.footer-links h3::after, .footer-contact-info h3::after {
    content: '';
    position: absolute;
    width: 2.5rem;
    height: 0.1875rem;
    background: var(--safety-orange);
    bottom: 0;
    left: 0;
}
.footer-links ul, .footer-contact-info ul { list-style: none; }
.footer-links li, .footer-contact-info li { margin-bottom: 0.75rem; }
.footer-links a {
    color: rgba(255,255,255,0.8); text-decoration: none; transition: var(--transition);
    font-size: 0.875rem; position: relative;
}
.footer-links a::after {
    content: '';
    position: absolute; bottom: -0.125rem; left: 0; width: 0; height: 0.0625rem;
    background: var(--safety-orange); transition: width 0.25s;
}
.footer-links a:hover::after { width: 100%; }
.footer-links a:hover { color: white; }
.footer-contact-info li {
    display: flex; align-items: center; gap: 0.625rem; color: rgba(255,255,255,0.8);
    font-size: 0.875rem;
}
.footer-contact-info i { color: var(--safety-orange); width: 1.25rem; }
.qr-code {
    margin-top: 1.25rem; text-align: center; background: rgba(255,255,255,0.1);
    padding: 0.9375rem; border: 0.0625rem solid rgba(255,255,255,0.2);
}
.qr-code img { width: 5rem; height: 5rem; margin-bottom: 0.5rem; }
.qr-code p { font-size: 0.75rem; color: rgba(255,255,255,0.7); }

.cert-badges {
    display: flex; flex-wrap: wrap; justify-content: center; gap: 1.5625rem;
    padding: 1.5625rem 0; border-top: 0.0625rem solid rgba(255,255,255,0.2);
    border-bottom: 0.0625rem solid rgba(255,255,255,0.2); margin-bottom: 1.5625rem;
}
.cert-badges span {
    display: flex; align-items: center; gap: 0.5rem; color: rgba(255,255,255,0.9);
    font-size: 0.875rem; background: rgba(255,255,255,0.05); padding: 0.375rem 1rem;
    transition: var(--transition);
}
.cert-badges span:hover {
    background: var(--safety-orange); color: white; transform: translateY(-0.125rem);
}
.footer-bottom {
    display: flex; flex-direction: column; align-items: center; gap: 0.9375rem;
    text-align: center;
}
.copyright { opacity: 0.7; font-size: 0.8125rem; }
.footer-links-horizontal {
    display: flex; gap: 0.9375rem; font-size: 0.8125rem; flex-wrap: wrap; justify-content: center;
}
.footer-links-horizontal a {
    color: rgba(255,255,255,0.7); text-decoration: none; transition: color 0.3s;
}
.footer-links-horizontal a:hover { color: var(--safety-orange); }

/* ========== 底部新增样式（适配footer.html） ========== */
.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(12.5rem, 1fr));
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: white;
    margin-bottom: 1.25rem;
    text-transform: uppercase;
    letter-spacing: 0.0625rem;
}

.footer-about span {
    opacity: 0.8;
    line-height: 1.8;
    margin-bottom: 1.25rem;
    font-size: 0.875rem;
    display: block;
}

.footer-contact {
    margin-top: 1.25rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
}

.contact-item i {
    color: var(--safety-orange);
    width: 1.25rem;
    font-size: 1rem;
}

/* 版权区域的 contact-item 特殊处理 */
.copyright.contact-item {
    margin-bottom: 0;
    justify-content: center;
    color: rgba(255,255,255,0.7);
    font-size: 0.8125rem;
}

/* ========== 返回顶部 ========== */
.back-to-top {
    position: fixed; bottom: 1.875rem; right: 1.875rem; width: 3.25rem; height: 3.25rem;
    background: var(--safety-orange); color: white; border: none; cursor: pointer;
    display: flex; align-items: center; justify-content: center; font-size: 1.375rem;
    opacity: 0; visibility: hidden; transition: var(--transition); z-index: 100;
    border-radius: 0; box-shadow: 0 0.25rem 0.75rem rgba(230,126,34,0.4);
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover {
    background: #c35f1a; transform: translateY(-0.25rem);
    box-shadow: 0 0.5rem 1.25rem rgba(230,126,34,0.6);
}

/* ========== 页面标题 ========== */
.page-header {
    padding: 8.75rem 0 3.75rem;
    background: linear-gradient(135deg, #0A2A44, #1A4A6F);
    color: white;
    text-align: center;
    border-bottom: 0.25rem solid var(--safety-orange);
}
.page-header h1 { font-size: 2.625rem; margin-bottom: 0.9375rem; text-transform: uppercase; }
.page-header p { font-size: 1.125rem; opacity: 0.9; }

/* ========== 动画 ========== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(1.875rem); }
    to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp 0.7s ease forwards; }
.stagger-delay-1 { animation-delay: 0.15s; }
.stagger-delay-2 { animation-delay: 0.3s; }
.stagger-delay-3 { animation-delay: 0.45s; }
.animate-on-scroll {
    opacity: 0; transform: translateY(1.875rem);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }

/* ========== 响应式 ========== */
@media (max-width: 80rem) {
    .hero h1 { font-size: 2.5rem; }
    .section-title h2 { font-size: 2rem; }
}
@media (max-width: 64rem) {
    .company-tagline { display: none; }
    .logo-img { height: 2.5rem; }
    .header-container { height: 4.25rem; }
    nav {
        position: fixed; top: 4.25rem; left: 0; width: 100%;
        background: rgba(10,42,68,0.98); backdrop-filter: blur(8px);
        padding: 1.25rem; transform: translateY(-100%); opacity: 0; visibility: hidden;
        transition: var(--transition); max-height: calc(100vh - 4.25rem); overflow-y: auto;
        border-top: 0.125rem solid var(--safety-orange);
    }
    nav.active { transform: translateY(0); opacity: 1; visibility: visible; }
    .main-menu { flex-direction: column; margin-right: 0; width: 100%; }
    .main-menu > li { margin: 0 0 1.25rem 0; width: 100%; }
    .main-menu > li > a { padding: 1rem 0; border-bottom: 0.0625rem solid rgba(255,255,255,0.1); }
    .main-menu > li > a::after { display: none; }
    .dropdown-content {
        position: static; opacity: 1; visibility: visible; transform: none;
        box-shadow: none; background: rgba(0,0,0,0.3); border: 0.0625rem solid rgba(255,255,255,0.1);
        display: none; margin: 0.5rem 0; padding: 0.75rem 0;
        border-top: 0.125rem solid var(--safety-orange);
    }
    .dropdown.active .dropdown-content { display: block; }
    .dropdown-section a { color: rgba(255,255,255,0.9); padding: 0.75rem 1.25rem; }
    .mobile-menu-btn { display: block; }
    .hero { padding: 8.75rem 0 6.25rem; }
    .hero h1 { font-size: 2.25rem; }
    .hero-buttons { flex-direction: column; gap: 0.9375rem; }
    .cta-buttons { flex-direction: column; gap: 0.9375rem; }
    .btn { width: 100%; justify-content: center; }
    .intro-content { grid-template-columns: 1fr; gap: 2.5rem; }
    .product-features { grid-template-columns: 1fr 1fr; }
    .case-row { grid-template-columns: 1fr; }
    .case-image { height: 17.5rem; order: -1; }
    .case-content { padding: 1.875rem; }
    .tab-header { flex-wrap: wrap; }
    .tab-btn { flex: 1 0 50%; border-bottom: 0.0625rem solid var(--border-color); }
    .tab-btn:nth-child(odd) { border-right: 0.0625rem solid var(--border-color); }
    .qa-grid { grid-template-columns: 1fr; }
    .client-logos { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 48rem) {
    .hero h1 { font-size: 1.875rem; }
    .section-title h2 { font-size: 1.75rem; }
    .product-features { grid-template-columns: 1fr; }
    .needs-grid { grid-template-columns: 1fr; }
    .solution-features { grid-template-columns: 1fr 1fr; }
    .tab-btn { flex: 1 0 100%; border-right: none !important; }
    .case-stats { flex-direction: column; gap: 0.9375rem; }
    .back-to-top { width: 2.875rem; height: 2.875rem; font-size: 1.125rem; bottom: 1.25rem; right: 1.25rem; }
    .footer-grid { grid-template-columns: 1fr; gap: 1.875rem; }
    .footer-content { grid-template-columns: 1fr; gap: 1.875rem; } /* 新增响应式 */
    .cert-badges { gap: 0.9375rem; }
    .cert-badges span { font-size: 0.75rem; padding: 0.25rem 0.75rem; }
    .container { --container-padding: 1rem; }
}
@media (max-width: 36rem) {
    .hero h1 { font-size: 1.625rem; }
    .section-title h2 { font-size: 1.5rem; }
    .landscape-grid, .profile-grid, .hot-products-grid, .qa-grid,
    .article-grid { grid-template-columns: 1fr; }
    .intro-stats { grid-template-columns: 1fr; }
    .solution-features { grid-template-columns: 1fr; }
    .client-logos { grid-template-columns: repeat(2, 1fr); }
}

/* ========== 键盘导航增强 ========== */
.keyboard-navigation a:focus,
.keyboard-navigation button:focus {
    outline: 0.125rem solid var(--safety-orange); outline-offset: 0.125rem;
}
.keyboard-navigation .dropdown:focus-within .dropdown-content {
    opacity: 1; visibility: visible;
}
.breadcrumb {
    background: var(--light-bg); padding: 0.75rem 0; border-bottom: 0.0625rem solid var(--border-color);
}