/* ===================================
   全局样式重置
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 颜色变量 */
    --primary-color: #1a1a1a;
    --secondary-color: #333333;
    --accent-color: #111;
    --text-dark: #1a1a1a;
    --text-gray: #666666;
    --text-light: #999999;
    --bg-white: #ffffff;
    --bg-light: #f5f5f5;
    --bg-dark: #1a1a1a;
    --border-color: #e0e0e0;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    
    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
    
    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1380px;
    margin: 0 auto;
    padding: 0 20px;
}

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

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

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
    transition: var(--transition);
}

/* ===================================
   顶部导航�?
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: transparent;
    z-index: 1000;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.1);
}

.header.scrolled .nav-link {
    color: var(--text-dark);
}

.header.scrolled .nav-link::after {
    background-color: var(--accent-color);
}

.header.scrolled .header-link {
    color: var(--text-dark);
}

.header.scrolled .mobile-toggle span {
    background-color: var(--text-dark);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0;
    font-size: 18px;
    font-weight: 700;
}

.logo-jia {
    background-color: #ffffff;
    color: #1a1a1a;
    padding: 8px 12px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.logo-shu {
    background-color: transparent;
    color: #ffffff;
    padding: 8px 12px;
    transition: background-color 0.3s ease, color 0.3s ease;
}
svg{width: 100%;height: 100%;}
.header.scrolled .logo-jia {
    background-color: #1a1a1a;
    color: #ffffff;
}

.header.scrolled .logo-shu {
    background-color: transparent;
    color: #1a1a1a;
}

.nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 48px;
}

.nav-link {
    color: #ffffff;
    font-size: 15px;
    font-weight: 600;
    position: relative;
    padding: 8px 0;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #ffffff;
    transition: width 0.3s ease, background-color 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover {
    color: rgba(255, 255, 255, 0.8);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-icon {
    font-size: 20px;
    color: #ffffff;
    transition: color 0.3s ease;
    padding-top: 3px;
    width: 18px;
}

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

.header-phone {
    color: #ffffff;
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 1px;
    transition: color 0.3s ease;
}

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

.header.scrolled .header-phone {
    color: var(--text-dark);
}

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

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    padding: 8px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background-color: #ffffff;
    transition: all 0.3s ease;
}

/* ===================================
   主视觉轮播区
   =================================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
}

.hero-slider {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 1s ease, visibility 1s ease;
}

.hero-slide.active {
    opacity: 1;
    visibility: visible;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.5));
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    color: #ffffff;
    line-height: 1.2;
    letter-spacing: -0.5px;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.hero-controls {
    position: absolute;
    bottom: 60px;
    right: 60px;
    z-index: 4;
    display: flex;
    align-items: center;
    gap: 16px;
}

.hero-prev,
.hero-next {
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.2);
    border: 1px solid #ffffff;
    border-radius: 50%;
    color: #ffffff;
    font-size: 28px;
    padding-bottom: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-prev:hover,
.hero-next:hover {
    background-color: #ffffff;
    color: var(--text-dark);
    transform: scale(1.1);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    animation: bounce 2s infinite;
}

.scroll-text {
    color: #ffffff;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.scroll-icon {
    width: 24px;
    height: 36px;
    border: 2px solid #ffffff;
    border-radius: 0;
    position: relative;
}

.scroll-icon::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background-color: #ffffff;
    border-radius: 0;
    animation: scrollDown 2s infinite;
}

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

@keyframes scrollDown {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(16px);
    }
}

/* ===================================
   搜索筛选区
   =================================== */
.filter-section {
    padding: 60px 0;
    background-color: var(--bg-light);
}

.filter-card {
    background-color: var(--bg-white);
    border-radius: 0;
    padding: 40px;
    box-shadow: var(--shadow-md);
}

.filter-row {
    display: flex;
    align-items: flex-end;
    gap: 20px;
    flex-wrap: wrap;
}

.filter-group {
    flex: 1;
    min-width: 180px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.filter-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-gray);
}

.filter-select {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    border: 1px solid var(--border-color);
    border-radius: 0;
    background-color: var(--bg-white);
    color: var(--text-dark);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23666' d='M6 8L0 2l1.4-1.4L6 5.2 10.6.6 12 2z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.filter-select:hover {
    border-color: var(--accent-color);
}

.filter-select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.btn-search {
    padding: 12px 40px;
    background-color: var(--text-dark);
    color: #ffffff;
    font-size: 15px;
    font-weight: 500;
    border-radius: 0;
    white-space: nowrap;
}

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

/* ===================================
   产品卡片�?
   =================================== */
.products-section {
    padding: 80px 0;
    background-color: var(--bg-white);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 48px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-dark);
}

.section-nav {
    display: flex;
    gap: 12px;
}

.nav-arrow {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: 0;
    background-color: var(--bg-white);
    color: var(--text-dark);
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-arrow:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background-color: rgba(0, 102, 255, 0.05);
}

.view-more {
    color: var(--accent-color);
    font-size: 15px;
    font-weight: 500;
    position: relative;
    transition: var(--transition);
}

.view-more::after {
    content: ' →';
    display: inline-block;
    transition: transform 0.3s ease;
    padding-left: 10px;
}

.view-more:hover::after {
    transform: translateX(4px);
}

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

.product-card {
    border: 1px solid var(--border-color);
    border-radius: 0;
    overflow: hidden;
    transition: var(--transition);
}

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

.product-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background-color: var(--bg-light);
}

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

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

.product-info {
    padding: 24px;
}

.product-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

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

.product-link {
    color: var(--accent-color);
    font-size: 14px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    position: relative;
    transition: var(--transition);
}

.product-link::after {
    content: ' →';
    padding-left: 10px;
    display: inline-block;
    transition: transform 0.3s ease;
}

.product-link:hover::after {
    transform: translateX(4px);
}


/* ===================================
   关于我们�?
   =================================== */
.about-section {
    padding: 100px 0;
    background-color: var(--bg-white);
}

.about-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text-content {
    max-width: 840px;
}

.about-title {
    font-size: 40px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.title-underline {
    width: 60px;
    height: 4px;
    background-color: var(--text-dark);
    margin-bottom: 32px;
}

.about-desc {
    font-size: 16px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-btn {
    padding: 14px 32px;
    background-color: var(--text-dark);
    color: #ffffff;
    font-size: 15px;
    font-weight: 500;
    border: none;
    border-radius: 0;
    margin-top: 16px;
    cursor: pointer;
    transition: var(--transition);
}

.about-btn:hover {
    background-color: var(--secondary-color);
}

.about-images-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

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

.about-image-1 {
}

.about-image-2 {
}

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

.about-image-1 img {
    padding-top: 40px;
}
.about-image-2 img {
    padding-bottom: 40px;
}



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

/* ===================================
   选择理由
   =================================== */
.reasons-section {
    padding: 80px 0;
    background-color: var(--bg-white);
}

.section-title-center {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 60px;
}

.reasons-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.reason-card {
    text-align: center;
    padding: 32px 24px;
    border-radius: 0;
    background-color: var(--bg-light);
    transition: var(--transition);
}

.reason-card:hover {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px);
}

.reason-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
}

.reason-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.reason-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.reason-desc {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

/* ===================================
   机械性能展示�?
   =================================== */
.performance-section {
    padding: 80px 0;
    background-color: var(--bg-dark);
    color: #ffffff;
}

.section-title-white {
    font-size: 36px;
    font-weight: 700;
    color: #ffffff;
    text-align: center;
    margin-bottom: 16px;
}

.section-subtitle-white {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.7);
    text-align: center;
    margin-bottom: 60px;
}

.performance-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.performance-item {
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 0;
    overflow: hidden;
    transition: var(--transition);
}

.performance-item:hover {
    background-color: rgba(255, 255, 255, 0.08);
    transform: translateY(-8px);
}

.performance-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
}

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

.performance-info {
    padding: 24px;
}

.performance-title {
    font-size: 20px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 8px;
}

.performance-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

/* ===================================
   案例展示�?
   =================================== */
.cases-section {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.cases-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.cases-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.cases-subtitle {
    color: var(--accent-color);
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 40px;
    cursor: pointer;
}

.cases-subtitle:hover {
    text-decoration: underline;
}

.case-detail {
    background-color: var(--bg-white);
    padding: 32px;
    border-radius: 0;
    box-shadow: var(--shadow-md);
}

.case-name {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.case-desc {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 20px;
}

.case-tags {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.tag {
    padding: 6px 16px;
    background-color: var(--bg-light);
    color: var(--text-gray);
    font-size: 13px;
    border-radius: 0;
}

.btn-outline {
    padding: 12px 32px;
    background-color: transparent;
    color: var(--text-dark);
    border: 1px solid var(--border-color);
    font-size: 15px;
    font-weight: 500;
    border-radius: 0;
}

.btn-outline:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background-color: rgba(0, 102, 255, 0.05);
}

.cases-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.case-item {
    display: flex;
    gap: 24px;
    padding: 24px;
    background-color: var(--bg-white);
    border-radius: 0;
    transition: var(--transition);
}

.case-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(8px);
}

.case-date {
    flex-shrink: 0;
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-color);
}

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

.case-item-desc {
    font-size: 14px;
    color: var(--text-gray);
}

/* ===================================
   CTA区域
   =================================== */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--accent-color), #0052cc);
}

.cta-box {
    text-align: center;
}

.cta-title {
    font-size: 40px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 16px;
}

.cta-desc {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
}

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

.btn-cta-primary {
    padding: 16px 48px;
    background-color: #ffffff;
    color: var(--accent-color);
    font-size: 16px;
    font-weight: 600;
    border-radius: 0;
}

.btn-cta-primary:hover {
    background-color: var(--bg-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.btn-cta-secondary {
    padding: 16px 48px;
    background-color: transparent;
    color: #ffffff;
    border: 2px solid #ffffff;
    font-size: 16px;
    font-weight: 600;
    border-radius: 0;
}

.btn-cta-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* ===================================
   页脚
   =================================== */
.footer {
    background-color: #f5f5f5;
    color: var(--text-dark);
    padding: 80px 0 0;
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand {
    max-width: 280px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-logo .logo-jia {
    background-color: #1a1a1a;
    color: #ffffff;
    padding: 8px 12px;
}

.footer-logo .logo-shu {
    background-color: transparent;
    color: #1a1a1a;
    padding: 8px 12px;
}

.footer-desc {
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-gray);
    margin-bottom: 24px;
}

.footer-social {
    display: flex;
    gap: 16px;
}

.social-link {
    font-size: 14px;
    color: var(--text-gray);
    transition: var(--transition);
}

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

.footer-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-gray);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--text-dark);
}

.footer-subscribe {
}

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

.subscribe-form {
    display: flex;
    margin-bottom: 24px;
}

.subscribe-input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 0;
    font-size: 14px;
    background-color: var(--bg-white);
}

.subscribe-input:focus {
    outline: none;
    border-color: var(--text-dark);
}

.subscribe-btn {
    padding: 12px 24px;
    background-color: var(--text-dark);
    color: #ffffff;
    border: none;
    border-radius: 0;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.subscribe-btn:hover {
    background-color: var(--secondary-color);
}

.footer-contact-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-contact-info p {
    font-size: 14px;
    color: var(--text-gray);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright {
    font-size: 14px;
    color: var(--text-light);
}

.footer-links-bottom {
    display: flex;
    gap: 24px;
}

.footer-links-bottom a {
    font-size: 14px;
    color: var(--text-light);
    transition: var(--transition);
}

.footer-links-bottom a:hover {
    color: var(--text-dark);
}

/* ===================================
   返回顶部
   =================================== */
.back-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 48px;
    height: 48px;
    background-color: var(--accent-color);
    color: #ffffff;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-md);
}
.back-top svg{width: 24px;height: 24px;}
.back-top.show {
    opacity: 1;
    visibility: visible;
}

.back-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}