/* ========================================
   CSS 变量
   ======================================== */
:root {
    --primary-color: #ff0000;
    --primary-dark: #cc0000;
    --secondary-color: #e8a033;
    --text-dark: #333333;
    --text-light: #666666;
    --text-gray: #999999;
    --bg-light: #f5f7fa;
    --white: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
    --container-width: 1600px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

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

ul {
    list-style: none;
}

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

/* ========================================
   主容器
   ======================================== */
.container {
    width: var(--container-width);
    max-width: 96%;
    margin: 0 auto;
}

/* ========================================
   轮播图区域
   ======================================== */
.banner-section {
    position: relative;
    width: 100%;
    height: 100vh;
    max-height: 900px;
    min-height: 600px;
    overflow: hidden;
    padding-top: 80px;
}

.banner-slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.banner-slide.active {
    opacity: 1;
}

.banner-overlay {
    display: none;
}

/* ========================================
   导航区域
   ======================================== */
.nav-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: padding 0.3s ease;
    background: transparent;
}

.nav-container.scrolled {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding-top: 0;
    padding-bottom: 0;
}

.nav-container.scrolled .nav-wrapper {
    margin-top: 0;
}

.nav-wrapper {
    width: var(--container-width);
    max-width: 96%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--white);
    padding: 0 30px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    height: 58px;
    flex-shrink: 0;
}

.logo-img {
    height: 58px;
    width: auto;
}

.logo-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    color: #000000;
    white-space: nowrap;
    line-height: 1.3;
}

.logo p {
    font-size: 12px;
    color: #000000;
    white-space: nowrap;
    line-height: 1.3;
}

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

.nav-list {
    display: flex;
    gap: 40px;
}

.nav-link {
    display: block;
    padding: 25px 0;
    font-size: 16px;
    color: #333;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 15px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

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

/* 二级菜单 */
.has-submenu {
    position: relative;
}

.submenu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 160px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    padding: 10px 0;
    z-index: 100;
}

.has-submenu:hover .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.submenu li a {
    display: block;
    padding: 10px 20px;
    font-size: 14px;
    color: #333;
    transition: all 0.3s ease;
}

.submenu li a:hover {
    background: #f5f7fa;
    color: var(--primary-color);
}

/* 导航咨询热线 */
.nav-tel {
    margin-left: 50px;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.nav-tel-label {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    color: #ff0000;
    font-weight: 600;
    line-height: 1.2;
}

.nav-tel-label img {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.nav-tel-number {
    display: block;
    font-size: 15px;
    color: #333;
    font-weight: 700;
    line-height: 1.2;
}

.nav-tel-number a {
    color: inherit;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

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

.mobile-menu-btn.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* 轮播控制按钮 */
.banner-controls {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.banner-dots {
    display: flex;
    gap: 10px;
}

.dot {
    width: 12px;
    height: 12px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.dot.active,
.dot:hover {
    background: var(--white);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

/* ========================================
   产品中心
   ======================================== */
.product-section {
    padding: 60px 0;
    background: #fff;
}

.section-header {
    text-align: left;
    margin-bottom: 0;
}

.section-title-row {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 0;
}

.section-title-left {
    display: flex;
    flex-direction: column;
    gap: 0;
    line-height: 1;
}

.section-title-en {
    font-size: 36px;
    color: #ff0000;
    font-weight: 700;
    letter-spacing: 1px;
    line-height: 1.4;
}

.section-title-cn {
    font-size: 28px;
    font-weight: 700;
    color: #000000;
    line-height: 1;
}

.section-title-right {
    padding-bottom: 0;
}

.section-title-sub {
    font-size: 18px;
    color: #888888;
}

.section-divider-line {
    display: block;
    width: 100%;
    height: 1px;
    background: #cccccc;
    margin: 25px 0 0;
}

.section-desc {
    font-size: 14px;
    color: #333;
}

/* 产品分类 */
.product-categories {
    display: flex;
    justify-content: flex-start;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.category-btn {
    padding: 14px 0;
    background: transparent;
    color: #333;
    border-radius: 0;
    font-size: 17px;
    font-weight: 500;
    transition: all 0.3s ease;
    text-align: center;
    margin: 0;
    width: 10%;
    flex: none;
    border-top: 2px solid transparent;
    border-bottom: 2px solid transparent;
}

.category-btn:first-child {
    background: transparent;
    color: #ff0000;
    font-weight: 700;
    border-top: 2px solid #ff0000;
    transform: translateY(-2px);
}

.category-btn:last-child {
    margin-right: 0;
}

.category-btn:hover {
    background: transparent;
    color: #ff0000;
    font-weight: 700;
    border-top: 2px solid #ff0000;
    transform: translateY(-2px);
    font-size: 16px;
}

/* 产品网格 */
.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.product-card {
    display: block;
    background: #f5f5f5;
    overflow: hidden;
    transition: all 0.3s ease;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.product-image {
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.product-card:hover .product-image img {
    transform: scale(1.08);
}

.product-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px;
    background: #f5f5f5;
    transition: all 0.3s ease;
}

.product-card:hover .product-info {
    background: var(--primary-color);
}

.product-name {
    font-size: 16px;
    font-weight: 500;
    color: #333;
    transition: all 0.3s ease;
}

.product-card:hover .product-name {
    color: #fff;
}

.product-arrow {
    width: 32px;
    height: 32px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.3s ease;
}

.product-arrow svg {
    width: 18px;
    height: 18px;
    fill: var(--primary-color);
    transition: all 0.3s ease;
}

.product-card:hover .product-arrow {
    border-color: #fff;
}

.product-card:hover .product-arrow svg {
    fill: #fff;
}

/* ========================================
   公司简介
   ======================================== */
.about-section {
    position: relative;
    background: url('../img/jjbj.jpg') no-repeat center center;
    background-size: cover;
}

.about-bg {
    width: 100%;
    background: url('../img/jj.jpg') no-repeat right bottom;
    background-size: auto;
    padding: 80px 0;
}

.about-top {
    display: flex;
    gap: 40px;
}

.about-intro {
    flex: 1;
    padding: 0;
}

.about-logo {
    width: auto;
    height: 60px;
    margin-right: 15px;
    margin-top: -20px;
    flex-shrink: 0;
}

.about-header {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
}

.about-titles {
    display: flex;
    flex-direction: column;
}

.about-intro h2 {
    font-size: 26px;
    line-height: 26px;
    margin: 0 0 12px 0;
    color: #fff;
    font-weight: 700;
}

.about-intro .intro-slogan {
    font-size: 18px;
    line-height: 18px;
    color: #ff0000;
}

.intro-slogan {
    font-size: 18px;
    line-height: 18px;
    color: #ff0000;
    margin-bottom: 25px;
}

.intro-desc {
    font-size: 16px;
    color: #fff;
    line-height: 2.0;
    margin: 60px 0 80px;
}

.about-btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 25px;
    font-size: 14px;
}

.about-btn:hover {
    background: var(--primary-dark);
}

.about-video {
    flex: 1;
}

.about-bottom {
    display: flex;
    justify-content: space-around;
    height: 170px;
    align-items: center;
    width: 100%;
}

.stat-item {
    display: flex;
    align-items: center;
}

.stat-icon {
    width: 70px;
    height: 70px;
    display: inline-block;
    vertical-align: middle;
    margin-right: 15px;
}

.stat-info {
    display: inline;
    line-height: 1.2;
}

.stat-num {
    display: inline;
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-unit {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    display: block;
    font-size: 16px;
    color: #333;
}

/* ========================================
   设备展示
   ======================================== */
.equipment-section {
    padding: 60px 0;
    background: url('../img/sbbj.jpg') no-repeat center center;
    background-size: cover;
}

.equipment-scroll-wrapper {
    overflow: hidden;
    margin-top: 24px;
    padding: 10px 0;
}

.equipment-scroll {
    display: flex;
    gap: 20px;
    animation: scroll-left 30s linear infinite;
}

@keyframes scroll-left {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.equipment-card {
    flex-shrink: 0;
    width: 400px;
    background: #f5f5f5;
    padding: 15px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.equipment-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.25);
}

.equipment-card img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: contain;
}

.equipment-name {
    font-size: 16px;
    font-weight: 500;
    color: #333;
    text-align: center;
    margin-top: 10px;
}

.equipment-section .section-title-row {
    justify-content: center;
    text-align: center;
    margin-bottom: 20px;
}

.equipment-section .section-title-left {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0;
    line-height: 1;
}

.equipment-title-wrap {
    text-align: center;
    margin-bottom: 25px;
}

.equipment-title-cn {
    line-height: 1;
}

.equipment-section .section-title-en {
    font-size: 16px;
    color: #000;
    line-height: 1.2;
    font-weight: 400;
}

.equipment-section .section-title-cn {
    font-size: 28px;
    color: #ff0000;
    line-height: 1.2;
    font-weight: 400;
}

.equipment-section .section-title-cn-black {
    font-size: 28px;
    color: #000;
    line-height: 1.2;
    font-weight: 400;
}

/* ========================================
   定制流程
   ======================================== */
.process-section {
    padding: 60px 0;
    background: #fff;
}

.process-steps {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-top: 50px;
    position: relative;
}

.process-step {
    flex: 1;
    text-align: center;
    position: relative;
    padding: 30px 10px 25px;
    background: #fff;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    border-radius: 5px;
    margin: 0 12px;
    border: 1px solid #c41e3a;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.process-step:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.25);
}

.step-number {
    position: absolute;
    top: 0;
    left: 0;
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    background: #ff0000;
    width: 60px;
    height: 60px;
    clip-path: polygon(0 0, 100% 0, 0 100%);
    text-indent: -20px;
    line-height: 60px;
    box-sizing: border-box;
}

.step-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto 20px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.step-content h3 {
    font-size: 22px;
    font-weight: 700;
    color: #ff0000;
    margin-bottom: 12px;
}

.step-content p {
    font-size: 15px;
    color: #666;
    line-height: 1.6;
}

.process-contact {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 30px;
    font-size: 24px;
    font-weight: 700;
    color: #333;
    padding: 0 10px;
}

.process-contact-left {
    text-align: left;
}

.process-contact-right {
    text-align: right;
    color: #ff0000;
    font-weight: 700;
}

/* ========================================
   应用领域
   ======================================== */
.application-section {
    padding: 60px 0;
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    min-height: 600px;
}

.app-tabs ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 15px;
    margin-top: 100px;
    margin-bottom: 30px;
    max-width: 520px;
}

.app-tabs li {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 25px;
    font-size: 16px;
    color: #000;
    border: 1px solid #000;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
    flex: 0 0 calc(33.333% - 10px);
    min-width: 140px;
}

.app-tabs li:hover {
    background: #ff0000;
    border-color: #ff0000;
    color: #fff;
}

.app-tabs li.tab-active {
    background: #ff0000;
    border-color: #ff0000;
    color: #fff;
}

.app-tabs li img {
    width: 28px;
    height: 28px;
    object-fit: contain;
    transition: filter 0.3s ease;
}

.app-tabs li:hover img,
.app-tabs li.tab-active img {
    filter: invert(100%) brightness(200%);
}

.app-tab-content {
    width: 100%;
    min-height: 300px;
    position: relative;
    z-index: 1;
}

.app-tab-text {
    position: absolute;
    bottom: 40px;
    left: 30px;
    transform: none;
    width: auto;
    max-width: 50%;
    background: transparent;
    padding: 0;
    border-radius: 0;
    text-align: left;
    font-size: 16px;
    color: #000;
    line-height: 1.8;
}

/* ========================================
   页脚
   ======================================== */
.footer-section {
    position: relative;
    padding: 40px 0 0 0;
    background: url('../img/fbj.jpg') no-repeat center center;
    background-size: cover;
    color: #fff;
}

/* 上方栏目导航 */
.footer-top-bar {
    padding: 0;
}

.footer-nav-row {
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 0;
}

.footer-nav-item {
    display: block;
    padding: 16px 20px;
    font-size: 15px;
    color: #fff;
    text-decoration: none;
    transition: color 0.3s ease;
    text-align: center;
    flex: 1;
}

.footer-nav-item:hover,
.footer-nav-item.active {
    color: #ff0000;
}

.footer-nav-item {
    color: #fff;
}

/* 白色分隔线 */
.footer-divider {
    width: 100%;
    height: 1px;
    background: #fff;
    margin: 0;
}

/* 底部 padding */
.footer-section > .container {
    padding-top: 50px;
    padding-bottom: 0;
}

/* 主体区域 7:3 */
.footer-main {
    display: flex;
    justify-content: space-between;
    gap: 40px;
    margin-bottom: 40px;
}

/* 左侧 70% */
.footer-left-main {
    flex: 0 0 70%;
}

.footer-company-name {
    font-size: 26px;
    font-weight: normal;
    color: #fff;
    margin-bottom: 8px;
    line-height: 1.4;
}

.footer-company-desc {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 25px;
    line-height: 1.6;
}

/* 联系信息网格 */
.footer-contact-grid {
    display: flex;
    gap: 40px;
    align-items: flex-start;
}

.footer-qrcode-block {
    flex-shrink: 0;
    margin-top: 40px;
}

.footer-qrcode-img {
    width: 120px;
    height: 120px;
    object-fit: contain;
}

.footer-contact-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex: 1;
    padding-top: 40px;
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.95);
    line-height: 1.6;
}

.footer-phone-num {
    font-size: 18px;
    font-weight: bold;
}

.footer-contact-icon {
    width: 20px;
    height: 20px;
    object-fit: contain;
    flex-shrink: 0;
}

/* 右侧 30% */
.footer-right-main {
    flex: 0 0 30%;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.footer-form-box {
    background: #fff;
    border-radius: 16px;
    padding: 28px 28px 24px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.footer-form-title {
    font-size: 20px;
    font-weight: 700;
    color: #333;
    text-align: center;
    margin-bottom: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.footer-form-title::before {
    display: none;
}

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

.footer-form-row {
    display: flex;
    gap: 14px;
}

.footer-form-field {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.footer-form-field-full {
    width: 100%;
}

.footer-form-label {
    font-size: 13px;
    color: #666;
    font-weight: 500;
}

.footer-form-required {
    color: #e63946;
    margin-left: 2px;
}

.footer-form-input,
.footer-form-textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
    color: #333;
    background: #f8f8f8;
    outline: none;
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.footer-form-input:focus,
.footer-form-textarea:focus {
    border-color: #e63946;
    background: #fff;
    box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.1);
}

.footer-form-input::placeholder,
.footer-form-textarea::placeholder {
    color: #aaa;
}

.footer-form-textarea {
    resize: none;
    height: 88px;
}

.footer-form-btn {
    width: 100%;
    padding: 13px;
    background: #ff0000;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 700;
    font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    letter-spacing: 4px;
    margin-top: 4px;
}

.footer-form-btn:hover {
    background: #e60000;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 0, 0, 0.4);
}

/* 底部版权栏 */
.footer-bottom {
    background: rgba(0, 0, 0, 0.5);
    padding: 18px 0;
}

.footer-bottom-inner {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    flex-wrap: wrap;
    gap: 8px;
}

.footer-bottom .copyright,
.footer-bottom .footer-links {
    display: inline;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
    margin-right: 20px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #ff0000;
}

/* 响应式页脚 */
@media (max-width: 992px) {
    .footer-nav-row {
        flex-wrap: wrap;
    }

    .footer-nav-item {
        flex: 0 0 33.333%;
    }

    .footer-main {
        flex-direction: column;
    }

    .footer-left-main {
        flex: none;
        width: 100%;
    }

    .footer-right-main {
        flex: none;
        width: 100%;
        justify-content: flex-start;
    }

    .footer-form-box {
        max-width: 100%;
    }

    .footer-bottom-inner {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .footer-nav-item {
        flex: 0 0 50%;
        padding: 12px 10px;
        font-size: 14px;
    }

    .footer-contact-grid {
        flex-direction: column;
        gap: 20px;
    }

    .footer-qrcode-img {
        width: 100px;
        height: 100px;
    }

    .footer-qrcode-block {
        display: none;
    }

    .footer-company-name {
        font-size: 18px;
    }
}

/* ========================================
   右侧浮动按钮
   ======================================== */
.float-btns {
    position: fixed;
    right: 20px;
    bottom: 100px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 999;
}

.float-btn {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: transform 0.3s ease;
    border-radius: 5px;
    cursor: pointer;
}

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

.float-btn:hover .float-tip {
    display: block;
}

.float-btn img {
    width: 30px;
    height: 30px;
}

.float-tip {
    position: absolute;
    right: 60px;
    background: var(--primary-color);
    color: #fff;
    padding: 10px;
    font-size: 14px;
    display: none;
    z-index: 1000;
    pointer-events: none;
}

.float-tip a {
    color: #fff;
    text-decoration: none;
    display: block;
}

.float-tip span {
    display: block;
    white-space: nowrap;
    margin-bottom: 4px;
}

.float-tip span:last-child {
    margin-bottom: 0;
}

.float-tip img {
    width: 120px;
    height: 120px;
    display: block;
    max-width: none;
    object-fit: contain;
}

.float-qrcode {
    padding: 10px;
    right: 60px;
}

.float-btn:hover .float-tip {
    display: block;
}

.float-qrcode img {
    width: 120px;
    height: 120px;
}

/* ========================================
   响应式设计 - 平板 (1200px)
   ======================================== */
@media (max-width: 1200px) {
    .container {
        width: 96%;
    }

    .nav-tel {
        display: none;
    }

    .nav-list {
        gap: 30px;
    }

    .product-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-content {
        flex-wrap: wrap;
    }

    .footer-left {
        width: 40%;
    }

    .footer-center {
        width: 30%;
    }

    .footer-right {
        width: 100%;
        margin-top: 20px;
    }
}

/* ========================================
   响应式设计 - 平板 / 大手机 (992px)
   ======================================== */
@media (max-width: 992px) {
    .banner-section {
        height: 400px;
        min-height: 400px;
        padding-top: 0;
    }

    .nav-wrapper {
        width: 100%;
        max-width: 100%;
        padding: 10px;
    }

    .nav-container {
        padding-top: 0;
    }

    .logo p {
        display: none;
    }

    .main-nav {
        position: fixed;
        top: 0;
        left: -100%;
        width: 280px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        justify-content: flex-start;
        padding-top: 80px;
        transition: var(--transition);
        box-shadow: var(--shadow);
        z-index: 1000;
    }

    .main-nav.active {
        left: 0;
    }

    .nav-list {
        flex-direction: column;
        gap: 0;
        width: 100%;
    }

    .nav-link {
        padding: 18px 30px;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-link::after {
        display: none;
    }

    /* 移动端二级菜单 */
    .has-submenu .submenu-toggle {
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .submenu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        padding: 0;
        background: transparent;
        border-radius: 0;
        display: none;
    }

    .has-submenu.open .submenu {
        display: block;
    }

    .submenu li a {
        padding: 12px 30px 12px 45px;
        font-size: 14px;
        color: #666;
    }

    .submenu li a:hover {
        background: transparent;
        color: var(--primary-color);
    }

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

    /* 公司简介 */
    .about-bg {
        background: none;
    }

    .about-top {
        flex-direction: column;
        padding-top: 5px;
        margin-bottom: 0;
    }

    .about-intro {
        padding-left: 0;
        padding-right: 0;
    }

    .about-bottom-wrapper {
        justify-content: stretch;
    }

    .about-bottom {
        max-width: 100%;
        height: auto;
        padding: 40px 0;
        flex-wrap: wrap;
        gap: 30px;
    }

    /* 页脚 */
    .footer-section > .container {
        padding-top: 30px;
    }
}

/* ========================================
   响应式设计 - 平板 (768px)
   ======================================== */
@media (max-width: 768px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .process-steps {
        flex-wrap: wrap;
    }

    .process-step {
        flex: 0 0 calc(50% - 12px);
        margin: 0 6px 20px;
    }

    .process-contact {
        flex-direction: column;
        font-size: 16px;
        text-align: center;
    }

    .process-contact-right {
        text-align: center;
        margin-top: 10px;
    }

    .app-tabs ul {
        justify-content: flex-start;
        gap: 10px;
        max-width: 100%;
        margin-top: 30px;
    }

    .app-tabs li {
        flex: 0 0 calc(33.333% - 7px);
        min-width: 90px;
        padding: 8px 10px;
        font-size: 14px;
        gap: 4px;
    }

    .app-tabs li img {
        width: 16px;
        height: 16px;
    }

    .app-tab-text {
        width: 100%;
        max-width: none;
        font-size: 14px;
        bottom: 20px;
        left: 0;
        padding: 15px 20px;
    }

    .product-categories {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 0;
    }

    .category-btn {
        width: 100%;
        padding: 10px 0;
        font-size: 17px;
        white-space: nowrap;
    }

    .about-bottom .stat-icon {
        display: none;
    }

    .section-title-right {
        display: none;
    }

    .footer-center,
    .footer-right {
        display: none;
    }
}

/* ========================================
   响应式设计 - 小手机 (480px)
   ======================================== */
@media (max-width: 480px) {
    .banner-section {
        height: 250px;
        min-height: 250px;
        padding-top: 0;
    }

    .nav-wrapper {
        width: 100%;
        max-width: 100%;
        padding: 5px;
    }

    .logo {
        height: 55px;
    }

    .logo-img {
        height: 40px;
        width: auto;
    }

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

    .logo h1 {
        font-size: 17px;
        line-height: 1.2;
    }

    .logo p {
        font-size: 10px;
        display: block;
    }

    .product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

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

    .section-title-en {
        font-size: 22px;
    }

    .stat-num {
        font-size: 28px !important;
    }

    .stat-unit {
        font-size: 14px !important;
    }

    .stat-label {
        font-size: 11px;
    }

    .intro-desc {
        margin: 30px 0 40px;
    }
}

/* ========================================
   特殊尺寸
   ======================================== */
@media (min-width: 1600px) {
    .nav-container:not(.scrolled) .nav-wrapper {
        margin-top: 20px;
    }

    .about-bottom {
        max-width: calc(1600px + (100vw - 1600px) / 2 - 624px);
    }
}

.news-section {
    padding: 60px 0;
    background: #fff;
}
.news-wrapper {
    display: flex;
    gap: 20px;
    margin-top: 50px;
}
.news-box {
    text-decoration: none;
    color: inherit;
    display: block;
}

/* Featured card: image full + gradient overlay */
.news-box-featured {
    flex: 0 0 40%;
}
.news-featured-img {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 400px;
    overflow: hidden;
}
.news-featured-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.news-featured-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40%;
    background: linear-gradient(to top, rgba(0,0,0,0.8), rgba(0,0,0,0));
    display: flex;
    align-items: flex-end;
}
.news-featured-content {
    padding: 30px;
    color: #fff;
}
.news-featured-content h3 {
    font-size: 22px;
    font-weight: bold;
    color: #fff;
    margin-bottom: 12px;
    text-shadow: 0 2px 4px rgba(0,0,0,.3);
}
.news-featured-content p {
    font-size: 14px;
    color: rgba(255,255,255,.95);
    line-height: 1.7;
    margin: 0;
}

/* Right list cards */
.news-list {
    flex: 1;
    display: flex;
    flex-direction: row;
    gap: 20px;
}
.news-box-item {
    flex: 1;
    background: #efeff1;
    padding: 20px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: all .3s ease;
    position: relative;
}
.news-box-item::after {
    display: none;
}
.news-box-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,.1);
}
.news-item-date {
    font-size: 13px;
    color: #888;
    margin-bottom: 10px;
}
.news-box-item h3 {
    font-size: 16px;
    font-weight: bold;
    color: #333;
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    padding-right: 30px;
}
.news-box-item p {
    font-size: 13px;
    color: #666;
    line-height: 1.6;
    margin-bottom: 15px;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.news-item-img {
    width: 100%;
    height: auto;
    overflow: hidden;
    margin-bottom: 12px;
}
.news-item-img img {
    width: 100%;
    height: auto;
    object-fit: contain;
}
.news-more {
    font-style: normal;
    font-size: 12px;
    color: #ff0000;
    margin-top: auto;
    padding-top: 8px;
    border-top: 1px solid #ddd;
}

@media (max-width: 768px) {
    .news-wrapper {
        flex-direction: column;
    }
    .news-box-featured {
        flex: none;
    }
    .news-featured-img {
        min-height: 280px;
    }
    .news-list {
        flex-direction: column;
    }
}

@media (max-width: 1600px) and (min-width: 993px) {
    .about-bottom {
        max-width: calc(96vw - 624px);
    }
}

/* ========================================
   内页通用样式
   ======================================== */
.page-banner {
    width: 100%;
    height: 400px;
    overflow: hidden;
}

.page-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.breadcrumb-bar {
    background: #f5f5f5;
    padding: 12px 0;
    border-bottom: 1px solid #eee;
}

.breadcrumb {
    font-size: 14px;
    color: #666;
}

.breadcrumb a {
    color: #666;
    text-decoration: none;
    transition: color 0.3s;
}

.breadcrumb a:hover {
    color: #ff0000;
}

.breadcrumb-sep {
    margin: 0 8px;
    color: #999;
}

.breadcrumb-current {
    color: #ff0000;
}

.page-content-section {
    padding: 40px 0 60px;
}

.page-layout {
    display: flex;
    gap: 40px;
}

.page-sidebar {
    width: 220px;
    flex-shrink: 0;
}

.sidebar-title {
    font-size: 18px;
    font-weight: 700;
    color: #333;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid #ff0000;
}

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

.sidebar-nav li {
    margin-bottom: 4px;
}

.sidebar-nav a {
    display: block;
    padding: 10px 16px;
    font-size: 15px;
    color: #333;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.3s;
}

.sidebar-nav a:hover {
    background: #fff0f0;
    color: #ff0000;
}

.sidebar-nav a.active {
    background: #ff0000;
    color: #fff;
}

.page-main {
    flex: 1;
}

.page-title {
    font-size: 22px;
    font-weight: 700;
    color: #333;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid #eee;
}

.page-article {
    font-size: 15px;
    line-height: 1.8;
    color: #555;
}

.page-article p {
    margin-bottom: 16px;
    text-align: justify;
}

@media (max-width: 768px) {
    .page-banner {
        height: 200px;
    }
    .page-layout {
        flex-direction: column;
    }
    .page-sidebar {
        width: 100%;
    }
    .sidebar-nav {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    .sidebar-nav a {
        padding: 8px 16px;
    }
}

/* 联系我们卡片 */
.contact-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 32px;
}

.contact-card {
    background: #fff;
    border-radius: 12px;
    padding: 32px;
    display: flex;
    align-items: flex-start;
    gap: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.contact-card:hover {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.14);
    transform: translateY(-4px);
}

.contact-card-icon {
    width: 56px;
    height: 56px;
    min-width: 56px;
    background: linear-gradient(135deg, #c0392b, #e74c3c);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-card-icon img {
    width: 28px;
    height: 28px;
    filter: brightness(0) invert(1);
}

.contact-card-content h3 {
    font-size: 16px;
    font-weight: bold;
    color: #c0392b;
    margin-bottom: 8px;
}

.contact-card-content p {
    font-size: 15px;
    color: #555;
    line-height: 1.8;
    margin-bottom: 4px;
}

@media (max-width: 768px) {
    .contact-cards {
        grid-template-columns: 1fr;
    }
    .contact-card {
        padding: 24px;
    }
}

/* 产品列表 */
.product-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 32px;
}

.product-item {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.product-item:hover {
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.14);
    transform: translateY(-4px);
}

.product-item a {
    display: block;
    text-decoration: none;
}

.product-img {
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
}

.product-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.product-name {
    padding: 14px 16px;
    text-align: center;
    font-size: 18px;
    color: #333;
    font-weight: 500;
}

@media (max-width: 768px) {
    .product-list {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    .product-name {
        font-size: 14px;
    }
}

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

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    margin-top: 40px;
}

.pagination a {
    display: inline-block;
    padding: 8px 14px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    color: #555;
    text-decoration: none;
    transition: all 0.3s ease;
}

.pagination a:hover:not(.active):not(.disabled) {
    border-color: #c0392b;
    color: #c0392b;
}

.pagination a.active {
    background: #c0392b;
    border-color: #c0392b;
    color: #fff;
}

.pagination a.disabled {
    color: #ccc;
    cursor: not-allowed;
}

/* 产品详情 */
.product-detail {
    display: flex;
    gap: 32px;
    margin-bottom: 40px;
}

/* 图片展示 */
.product-gallery {
    flex: 1;
}

.gallery-main {
    width: 100%;
    aspect-ratio: 4 / 3;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #eee;
    margin-bottom: 12px;
}

.gallery-main img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.gallery-thumbs {
    display: flex;
    gap: 10px;
}

.thumb-item {
    width: 80px;
    aspect-ratio: 4 / 3;
    border-radius: 6px;
    overflow: hidden;
    border: 2px solid transparent;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.thumb-item.active,
.thumb-item:hover {
    border-color: #c0392b;
}

.thumb-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 产品详情信息 */
.detail-info {
    flex: 1;
}

.detail-info-title {
    font-size: 22px;
    color: #333;
    margin-bottom: 10px;
    font-weight: bold;
}

.detail-info-desc {
    font-size: 14px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 20px;
}

.detail-info-price {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.detail-info-actions {
    display: flex;
    gap: 12px;
}

.price-label {
    font-size: 14px;
    color: #666;
}

.price-value {
    font-size: 20px;
    color: #c0392b;
    font-weight: bold;
}

.btn-inquiry,
.btn-tel {
    display: inline-block;
    padding: 10px 28px;
    border-radius: 4px;
    font-size: 15px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-inquiry {
    background: #c0392b;
    color: #fff;
}

.btn-inquiry:hover {
    background: #a93226;
}

.btn-tel {
    background: #fff;
    color: #c0392b;
    border: 1px solid #c0392b;
}

.btn-tel:hover {
    background: #fff5f5;
}

/* 产品介绍 */
.product-intro {
    margin-bottom: 40px;
}

.intro-title {
    font-size: 18px;
    color: #333;
    font-weight: bold;
    padding-bottom: 12px;
    border-bottom: 2px solid #c0392b;
    margin-bottom: 20px;
}

@media (max-width: 1024px) {
    .product-detail {
        flex-direction: column;
    }
    .product-gallery {
        width: 100%;
        min-width: unset;
    }
    .gallery-thumbs {
        justify-content: center;
    }
}

/* 图片展示页 */
.img-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.img-card {
    background: #fff;
}

.img-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
}

.img-card-box {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    background: #f0f0f0;
}

.img-card-src {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.4s ease;
}

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

.img-card-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.img-card:hover .img-card-overlay {
    opacity: 1;
}

.img-card-zoom {
    color: #fff;
    font-size: 14px;
    padding: 6px 16px;
    border: 1px solid #fff;
    border-radius: 20px;
}

.img-card-title {
    padding: 12px 8px 4px;
    font-size: 14px;
    color: #333;
    text-align: center;
}

@media (max-width: 1024px) {
    .img-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .img-grid {
        grid-template-columns: 1fr;
    }
}

/* 图片放大灯箱 */
.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.85);
    z-index: 9999;
    align-items: center;
    justify-content: center;
}

.lightbox.active {
    display: flex;
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 40px;
    color: #fff;
    text-decoration: none;
    line-height: 1;
    z-index: 10001;
}

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 36px;
    color: #fff;
    text-decoration: none;
    padding: 16px 12px;
    z-index: 10001;
    opacity: 0.7;
}

.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

.lightbox-content {
    max-width: 90vw;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.lightbox-content img {
    max-width: 90vw;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 4px;
}

.lightbox-caption {
    color: #ccc;
    font-size: 14px;
    margin-top: 12px;
    text-align: center;
}

/* 文章列表 */
.article-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

.article-item {
    display: flex;
    gap: 20px;
    padding: 20px;
    background: #fff;
    border: 1px solid #eee;
    border-radius: 8px;
    text-decoration: none;
    color: inherit;
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.article-item:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    border-color: #ddd;
}

.article-thumb {
    width: 200px;
    height: 130px;
    flex-shrink: 0;
    border-radius: 6px;
    overflow: hidden;
}

.article-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

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

.article-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.article-item-title {
    font-size: 17px;
    color: #333;
    margin-bottom: 8px;
    font-weight: bold;
    line-height: 1.5;
}

.article-item:hover .article-item-title {
    color: #c0392b;
}

.article-item-desc {
    font-size: 14px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    display: flex;
    gap: 20px;
    font-size: 13px;
    color: #999;
}

@media (max-width: 768px) {
    .article-item {
        flex-direction: column;
    }
    .article-thumb {
        width: 100%;
        height: 180px;
    }
    .equipment-card {
        width: 280px;
    }
}

/* 文章详情 */
.article-detail-meta {
    display: flex;
    gap: 24px;
    font-size: 13px;
    color: #999;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid #eee;
}

.article-prev-next {
    margin-top: 40px;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.article-prev,
.article-next {
    font-size: 14px;
    color: #666;
}

.article-prev a,
.article-next a {
    color: #333;
    text-decoration: none;
}

.article-prev a:hover,
.article-next a:hover {
    color: #c0392b;
}

.article-nav-label {
    color: #999;
}

.article-back {
    margin-top: 20px;
    text-align: center;
}

.btn-back-list {
    display: inline-block;
    padding: 10px 28px;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 4px;
    color: #666;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
}

.btn-back-list:hover {
    background: #c0392b;
    border-color: #c0392b;
    color: #fff;
}