/* ========================================
   山西泽明环保科技 - 工业风WordPress企业网站
   设计风格：深蓝 + 不锈钢灰 + 橙色点缀
   ======================================== */

/* ==================== CSS变量定义 ==================== */
:root {
    /* 主色调 - 深蓝系 */
    --primary-dark: #1a365d;
    --primary: #2c5282;
    --primary-light: #3182ce;
    --primary-lighter: #4299e1;

    /* 不锈钢灰系 */
    --steel-dark: #4a5568;
    --steel: #718096;
    --steel-light: #a0aec0;
    --steel-lighter: #e2e8f0;

    /* 橙色点缀 */
    --accent: #ed8936;
    --accent-dark: #dd6b20;
    --accent-light: #f6ad55;

    /* 功能色 */
    --success: #38a169;
    --warning: #d69e2e;
    --danger: #e53e3e;
    --info: #3182ce;

    /* 背景色 */
    --bg-white: #ffffff;
    --bg-light: #f7fafc;
    --bg-dark: #1a202c;
    --bg-darker: #171923;

    /* 文字色 */
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --text-light: #a0aec0;
    --text-white: #ffffff;

    /* 边框色 */
    --border: #e2e8f0;
    --border-dark: #cbd5e0;

    /* 阴影 */
    --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 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-xl: 0 35px 60px -15px rgba(0, 0, 0, 0.3);

    /* 圆角 */
    --radius-sm: 4px;
    --radius: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

    /* 间距 */
    --header-height: 80px;
    --container-max: 1200px;
    --container-padding: 20px;
}

/* ==================== 基础重置 ==================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
    overflow-x: hidden;
    padding-top: 116px;
}

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

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

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

ul, ol {
    list-style: none;
}

button, input, textarea, select {
    font-family: inherit;
    font-size: inherit;
    border: none;
    outline: none;
    background: none;
}

button {
    cursor: pointer;
}

/* ==================== 通用容器 ==================== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: 80px 0;
}

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

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--text-white);
    font-size: 14px;
    font-weight: 500;
    border-radius: 20px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-title .highlight {
    color: var(--accent);
}

.section-desc {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.section-cta {
    text-align: center;
    margin-top: 50px;
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius);
    transition: all var(--transition);
    cursor: pointer;
    white-space: nowrap;
}

.btn i {
    font-size: 14px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: var(--text-white);
    box-shadow: 0 4px 15px rgba(237, 137, 54, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(237, 137, 54, 0.5);
    color: var(--text-white);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--text-white);
}

.btn-secondary {
    background: var(--steel);
    color: var(--text-white);
}

.btn-secondary:hover {
    background: var(--steel-dark);
    color: var(--text-white);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 16px;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.btn-block {
    width: 100%;
}

/* ==================== 头部导航 ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.header-top-bar {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    padding: 8px 0;
}

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

.header-location {
    display: flex;
    align-items: center;
    gap: 6px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 13px;
}

.header-location i {
    color: var(--accent-light);
}

.header-phones {
    display: flex;
    gap: 30px;
}

.header-phone {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 14px;
}

.header-phone i {
    color: var(--accent-light);
}

.header-phone a {
    color: var(--text-white);
    font-weight: 600;
}

.header-phone a:hover {
    color: var(--accent-light);
}

.header-main {
    background: #ffffff;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    transition: all var(--transition);
    position: fixed;
    top: 36px;
    left: 0;
    right: 0;
    border-bottom: 3px solid var(--accent);
}

.header.scrolled {
    height: 70px;
    background: rgba(255, 255, 255, 0.98);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-img {
    height: 80px;
    width: auto;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    font-size: 24px;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-dark);
    line-height: 1.2;
}

.logo-tagline {
    font-size: 12px;
    color: var(--accent);
}

/* 主导航 */
.main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 12px 22px;
    font-size: 17px;
    font-weight: 700;
    color: var(--accent);
    border-radius: var(--radius);
    transition: all var(--transition-fast);
    letter-spacing: 0.5px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.nav-link:hover,
.nav-item.active .nav-link {
    color: var(--accent-dark);
    background: rgba(237, 137, 54, 0.15);
    transform: translateY(-2px);
}

.nav-link i {
    font-size: 12px;
    transition: transform var(--transition-fast);
}

/* 下拉菜单 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 200px;
    background: var(--bg-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    padding: 8px;
}

.nav-item.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-menu li a {
    display: block;
    padding: 12px 20px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.dropdown-menu li a:hover {
    color: var(--accent);
    background: rgba(237, 137, 54, 0.1);
}

/* 头部CTA */
.header-cta {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-phone {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: var(--text-white);
    font-weight: 600;
    border-radius: var(--radius);
    transition: all var(--transition);
}

.btn-phone:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(237, 137, 54, 0.4);
    color: var(--text-white);
}

.btn-phone i {
    font-size: 16px;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    padding: 0;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 3px;
    background: var(--primary-dark);
    border-radius: 2px;
    transition: all var(--transition);
}

/* 移动端菜单 */
.mobile-menu {
    position: fixed;
    top: 116px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-white);
    padding: 20px;
    transform: translateX(100%);
    transition: transform var(--transition);
    z-index: 999;
    overflow-y: auto;
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-nav-list > li {
    border-bottom: 1px solid var(--border);
}

.mobile-nav-list > li > a {
    display: block;
    padding: 15px 0;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
}

.mobile-submenu {
    padding-left: 20px;
    display: none;
}

.mobile-dropdown.active .mobile-submenu {
    display: block;
}

.mobile-submenu li a {
    display: block;
    padding: 10px 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.mobile-contact {
    margin-top: 30px;
}

/* ==================== 首页Hero区域 ==================== */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    margin-top: -116px;
}

.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    object-fit: cover;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26, 54, 93, 0.80) 0%, rgba(44, 82, 130, 0.75) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    padding: 120px 0 80px;
}

.hero-company-name {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-white);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 30px;
    color: var(--text-white);
    font-size: 14px;
    margin-bottom: 30px;
}

.badge-icon {
    color: var(--accent);
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    color: var(--text-white);
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero-title .highlight {
    color: var(--accent-light);
}

.hero-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.8;
    margin-bottom: 40px;
}

.hero-subtitle strong {
    color: var(--text-white);
    background: rgba(255, 255, 255, 0.15);
    padding: 2px 8px;
    border-radius: 4px;
}

/* 数据展示 */
.hero-features {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 30px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    min-width: 120px;
}

.feature-number {
    font-size: 42px;
    font-weight: 800;
    color: var(--accent-light);
    line-height: 1;
}

.feature-unit {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    margin-left: 2px;
}

.feature-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 8px;
}

/* Hero CTA */
.hero-cta {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* 滚动提示 */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* ==================== 核心优势区 ==================== */
.advantages-section {
    background: var(--bg-light);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-card {
    position: relative;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}

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

.advantage-card.featured {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--text-white);
}

.advantage-card.featured .advantage-icon {
    background: var(--accent);
}

.advantage-card.featured .advantage-list li {
    color: rgba(255, 255, 255, 0.9);
}

.advantage-card.featured .advantage-list li i {
    color: var(--accent-light);
}

.advantage-badge {
    position: absolute;
    top: -10px;
    right: 20px;
    padding: 4px 12px;
    background: var(--accent);
    color: var(--text-white);
    font-size: 12px;
    font-weight: 600;
    border-radius: 10px;
}

.advantage-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--text-white);
    margin-bottom: 24px;
}

.advantage-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.advantage-card.featured h3 {
    color: var(--text-white);
}

.advantage-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.advantage-card.featured p {
    color: rgba(255, 255, 255, 0.85);
}

.advantage-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.advantage-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.advantage-list li i {
    color: var(--success);
    font-size: 14px;
}

/* ==================== 产品中心 ==================== */
.products-section {
    background: var(--bg-white);
}

/* 产品分类Tab */
.product-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 10px 24px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-light);
    border: 2px solid var(--border);
    border-radius: 30px;
    cursor: pointer;
    transition: all var(--transition);
}

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

.tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--text-white);
}

/* 产品网格 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    position: relative;
    height: 200px;
    background: linear-gradient(135deg, var(--steel-lighter) 0%, var(--bg-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-placeholder {
    font-size: 64px;
    color: var(--steel-light);
}

.product-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 6px 14px;
    background: var(--primary);
    color: var(--text-white);
    font-size: 13px;
    font-weight: 700;
    border-radius: 20px;
}

.product-badge.accent {
    background: var(--accent);
}

.product-badge.warning {
    background: var(--danger);
}

.product-content {
    padding: 24px;
}

.product-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.product-specs {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.product-specs span {
    font-size: 13px;
    color: var(--text-secondary);
}

.product-specs strong {
    color: var(--text-primary);
    font-weight: 600;
}

.product-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.product-applications {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.app-tag {
    padding: 4px 10px;
    background: var(--bg-light);
    color: var(--text-secondary);
    font-size: 12px;
    border-radius: 4px;
}

.product-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.product-price {
    font-size: 18px;
    font-weight: 700;
    color: var(--accent);
}

.product-price span {
    font-size: 12px;
    font-weight: 400;
    color: var(--text-muted);
}

/* ==================== 加工能力 ==================== */
.capabilities-section {
    background: var(--bg-dark);
    color: var(--text-white);
}

.capabilities-section .section-header.light .section-title,
.capabilities-section .section-header.light .section-desc {
    color: var(--text-white);
}

.capabilities-section .section-header.light .section-desc {
    color: rgba(255, 255, 255, 0.7);
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.capability-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
}

.capability-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.capability-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.capability-icon {
    width: 60px;
    height: 60px;
    background: var(--accent);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: var(--text-white);
}

.capability-info h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 4px;
}

.capability-tag {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
}

.capability-content {
    padding: 24px;
}

.capability-highlight {
    display: flex;
    gap: 30px;
    margin-bottom: 20px;
}

.highlight-item {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.highlight-value {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.highlight-value span {
    font-size: 18px;
    font-weight: 600;
}

.highlight-label {
    font-size: 14px;
    color: var(--text-muted);
}

.capability-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.capability-specs {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 16px;
    background: var(--bg-light);
    border-radius: var(--radius);
    margin-bottom: 16px;
}

.spec-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
}

.spec-label {
    color: var(--text-secondary);
}

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

.capability-advantages {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.capability-advantages span {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--success);
}

/* ==================== 成功案例 ==================== */
.cases-section {
    background: var(--bg-light);
}

/* 案例筛选 */
.case-filters {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-white);
    border: 2px solid var(--border);
    border-radius: 30px;
    cursor: pointer;
    transition: all var(--transition);
}

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

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

/* 案例网格 */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.case-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.case-image {
    position: relative;
    height: 180px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-placeholder {
    font-size: 64px;
    color: rgba(255, 255, 255, 0.3);
}

.case-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 6px 14px;
    background: var(--accent);
    color: var(--text-white);
    font-size: 13px;
    font-weight: 600;
    border-radius: 20px;
}

.case-content {
    padding: 24px;
}

.case-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.4;
}

.case-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.case-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}

.case-meta i {
    color: var(--primary);
}

.case-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.case-specs {
    display: flex;
    gap: 20px;
    padding: 16px;
    background: var(--bg-light);
    border-radius: var(--radius);
    margin-bottom: 16px;
}

.spec-item {
    flex: 1;
    text-align: center;
}

.spec-item .spec-label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.spec-item .spec-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.spec-item .spec-value.rating {
    color: var(--warning);
    letter-spacing: 2px;
}

.case-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
}

.case-link:hover {
    color: var(--accent);
}

/* ==================== 资质展示 ==================== */
.certifications-section {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: var(--text-white);
    padding: 60px 0;
}

.certifications-grid {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.cert-card {
    text-align: center;
    padding: 20px;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-lg);
    min-width: 280px;
}

.cert-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    border-radius: var(--radius);
    margin-bottom: 16px;
    background: var(--bg-light);
}

.cert-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.cert-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: var(--text-white);
}

.cert-card h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--primary-dark);
}

.cert-card p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.cert-status {
    display: inline-block;
    padding: 4px 12px;
    background: var(--success);
    color: var(--text-white);
    font-size: 12px;
    border-radius: 10px;
}

.cert-features {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    margin-top: 30px;
}

.cert-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-white);
    font-size: 15px;
}

.cert-feature i {
    color: var(--accent-light);
    font-size: 18px;
}

/* ==================== 关于我们 ==================== */
.about-section {
    background: var(--bg-white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-content .section-tag {
    margin-bottom: 12px;
}

.about-content .section-title {
    text-align: left;
    margin-bottom: 24px;
}

.about-text {
    margin-bottom: 30px;
}

.about-text p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-text strong {
    color: var(--text-primary);
}

.about-stats {
    display: flex;
    gap: 30px;
    padding: 30px;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    margin-bottom: 30px;
}

.stat-item {
    flex: 1;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.stat-number span {
    font-size: 20px;
}

.stat-label {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 8px;
}

.about-values {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.value-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.value-item i {
    color: var(--success);
}

/* About Visual */
.about-visual {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.about-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.image-placeholder {
    height: 300px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 64px;
}

.image-placeholder span {
    font-size: 16px;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.feature-box {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px;
    background: var(--bg-light);
    border-radius: var(--radius);
}

.feature-box i {
    font-size: 28px;
    color: var(--primary);
}

.feature-box h5 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.feature-box p {
    font-size: 12px;
    color: var(--text-muted);
}

/* ==================== 知识中心 ==================== */
.knowledge-section {
    background: var(--bg-light);
}

.knowledge-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
}

.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.knowledge-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}

.knowledge-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.knowledge-image {
    position: relative;
    height: 140px;
    background: linear-gradient(135deg, var(--steel-light) 0%, var(--steel) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.knowledge-placeholder {
    font-size: 48px;
    color: rgba(255, 255, 255, 0.5);
}

.knowledge-tag {
    position: absolute;
    bottom: 12px;
    left: 12px;
    padding: 4px 10px;
    background: var(--primary);
    color: var(--text-white);
    font-size: 12px;
    font-weight: 600;
    border-radius: 10px;
}

.knowledge-content {
    padding: 20px;
}

.knowledge-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.4;
}

.knowledge-title a {
    color: inherit;
}

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

.knowledge-excerpt {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.knowledge-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 12px;
    font-size: 12px;
    color: var(--text-muted);
}

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

.knowledge-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
}

.knowledge-link:hover {
    color: var(--accent);
}

/* ==================== 在线询价 ==================== */
.quote-section {
    background: var(--bg-white);
    padding: 100px 0;
}

.quote-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.quote-info h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.quote-info h2 .highlight {
    color: var(--accent);
}

.quote-info > p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.quote-promises {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 40px;
}

.promise-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 20px;
    background: var(--bg-light);
    border-radius: var(--radius);
}

.promise-item i {
    font-size: 24px;
    color: var(--primary);
    margin-top: 2px;
}

.promise-item h5 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.promise-item p {
    font-size: 13px;
    color: var(--text-secondary);
}

.quote-contact {
    display: flex;
    gap: 30px;
}

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

.contact-item i {
    font-size: 32px;
    color: var(--primary);
}

.contact-label {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
}

.contact-value {
    display: block;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.contact-item a.contact-value:hover {
    color: var(--accent);
}

/* 询价表单 */
.quote-form-wrapper {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 40px;
}

.quote-form h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 30px;
    text-align: center;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

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

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

.required {
    color: var(--danger);
}

.form-group input[type="text"],
.form-group input[type="tel"],
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    color: var(--text-primary);
    background: var(--bg-light);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    transition: all var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    background: var(--bg-white);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-light);
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* 文件上传 */
.file-upload {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 30px;
    background: var(--bg-light);
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
}

.file-upload:hover {
    border-color: var(--primary);
    background: rgba(44, 82, 130, 0.05);
}

.file-upload i {
    font-size: 36px;
    color: var(--steel-light);
}

.file-upload span {
    font-size: 14px;
    color: var(--text-secondary);
}

.file-hint {
    font-size: 12px !important;
    color: var(--text-muted) !important;
}

.file-list {
    margin-top: 10px;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 15px;
    background: var(--bg-light);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    font-size: 13px;
}

.file-item i {
    color: var(--success);
    margin-right: 8px;
}

.file-item .remove-file {
    color: var(--danger);
    cursor: pointer;
}

.form-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 16px;
    font-size: 13px;
    color: var(--text-muted);
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--bg-dark);
    color: var(--text-white);
}

.footer-top {
    padding: 60px 0 40px;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo .logo-icon {
    width: 48px;
    height: 48px;
    background: var(--primary);
    border-radius: var(--radius);
}

.footer-logo .logo-text .logo-name {
    color: var(--text-white);
    font-size: 16px;
}

.footer-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    margin-bottom: 20px;
}

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

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    transition: all var(--transition);
}

.social-link:hover {
    background: var(--accent);
    color: var(--text-white);
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-white);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

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

.footer-links li a:hover {
    color: var(--accent);
    padding-left: 4px;
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

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

.footer-contact li i {
    color: var(--accent);
    margin-top: 3px;
    font-size: 16px;
}

.footer-contact li a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-contact li a:hover {
    color: var(--accent);
}

.footer-bottom {
    padding: 20px 0;
    background: var(--bg-darker);
}

.footer-bottom-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.copyright {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}

.copyright a {
    color: rgba(255, 255, 255, 0.8);
}

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

.seo-keywords {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.seo-keywords span {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.4);
}

/* ==================== 固定联系栏 ==================== */
.fixed-contact {
    position: fixed;
    right: 20px;
    bottom: 40px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 999;
}

.contact-btn {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 20px;
    color: var(--text-white);
    box-shadow: var(--shadow-md);
    transition: all var(--transition);
    text-decoration: none;
}

.contact-btn:hover {
    transform: scale(1.1);
}

.contact-btn.phone {
    background: var(--success);
}

.contact-btn.wechat {
    background: var(--success);
}

.contact-btn.quote {
    background: var(--accent);
}

.contact-btn.back-to-top {
    background: var(--primary);
    border: none;
    cursor: pointer;
}

.contact-tooltip {
    position: absolute;
    right: 60px;
    padding: 6px 12px;
    background: var(--bg-dark);
    color: var(--text-white);
    font-size: 13px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.contact-btn:hover .contact-tooltip {
    opacity: 1;
    visibility: visible;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1200px) {
    .hero-title {
        font-size: 40px;
    }

    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .knowledge-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 992px) {
    .main-nav {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero-features {
        gap: 20px;
    }

    .feature-item {
        padding: 15px 20px;
        min-width: 100px;
    }

    .feature-number {
        font-size: 32px;
    }

    .capabilities-grid {
        grid-template-columns: 1fr;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-content .section-title {
        text-align: center;
    }

    .about-stats {
        flex-wrap: wrap;
    }

    .quote-grid {
        grid-template-columns: 1fr;
    }

    .quote-info {
        text-align: center;
    }

    .quote-promises {
        justify-content: center;
    }

    .quote-contact {
        justify-content: center;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 28px;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-features {
        flex-direction: column;
        align-items: center;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-cta .btn {
        width: 100%;
        max-width: 280px;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .knowledge-grid {
        grid-template-columns: 1fr;
    }

    .about-stats {
        flex-direction: column;
    }

    .about-values {
        grid-template-columns: 1fr;
    }

    .about-features {
        grid-template-columns: 1fr;
    }

    .certifications-grid {
        flex-direction: column;
        align-items: center;
    }

    .cert-features {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-logo {
        justify-content: center;
    }

    .footer-social {
        justify-content: center;
    }

    .footer-links {
        align-items: center;
    }

    .footer-contact li {
        justify-content: center;
    }

    .footer-bottom-inner {
        flex-direction: column;
        text-align: center;
    }

    .quote-form-wrapper {
        padding: 24px;
    }

    .fixed-contact {
        right: 10px;
        bottom: 20px;
    }

    .contact-btn {
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero-content {
        padding: 100px 0 60px;
    }

    .hero-title {
        font-size: 24px;
    }

    .section-title {
        font-size: 24px;
    }

    .btn-lg {
        padding: 14px 24px;
        font-size: 15px;
    }

    .quote-contact {
        flex-direction: column;
        gap: 16px;
    }
}

/* ==================== 动画效果 ==================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* 元素进入动画 */
.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

/* 加载状态 */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 隐藏滚动条但保留功能 */
.hide-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.hide-scrollbar::-webkit-scrollbar {
    display: none;
}