/* ==========================================
   基础变量和重置
========================================== */
:root {
    --primary-color: #ff6600;
    --primary-dark: #e55a00;
    --text-dark: #333333;
    --text-medium: #666666;
    --text-light: #999999;
    --bg-light: #f8f9fa;
    --bg-dark: #222222;
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 5px 20px rgba(0,0,0,0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --container-max-width: 1200px;
    --gap: 20px;
}

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

body {
    font-family: 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background: #ffffff;
}

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

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: var(--text-dark);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    margin: 15px auto 0;
}

/* ==========================================
   顶部条和头部
========================================== */
.top-bar {
    background: var(--bg-dark);
    color: #ffffff;
    padding: 10px 0;
    position: relative;
}

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

/* 语言切换器 */
.language-switcher select {
    padding: 8px 15px;
    border: 1px solid #444;
    border-radius: var(--border-radius);
    background: #333;
    color: #fff;
    font-size: 14px;
    cursor: pointer;
}

.language-switcher select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 联系方式 */
.header-contacts {
    display: flex;
    gap: 25px;
}

.contact-link {
    color: #ffffff;
    text-decoration: none;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.contact-link:hover {
    color: var(--primary-color);
}

.contact-link i {
    font-size: 18px;
}

/* 主头部 */
.site-header {
    background: #ffffff;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.site-logo h1 {
    font-size: 24px;
    margin: 0;
    color: var(--primary-color);
}

.site-logo p {
    margin: 0;
    font-size: 12px;
    color: var(--text-medium);
}

/* 导航菜单 */
.main-nav .nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.main-nav .nav-menu > li {
    position: relative;
}

.main-nav .nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    padding: 10px 0;
    display: block;
    transition: var(--transition);
    position: relative;
}

.main-nav .nav-menu a:hover {
    color: var(--primary-color);
}

.main-nav .nav-menu .current-menu-item > a {
    color: var(--primary-color);
}

/* 下拉菜单 */
.main-nav .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #ffffff;
    box-shadow: var(--shadow);
    list-style: none;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 1001;
}

.main-nav .nav-menu > li:hover .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.main-nav .sub-menu a {
    padding: 12px 20px;
    border-bottom: 1px solid #eee;
}

.main-nav .sub-menu li:last-child a {
    border-bottom: none;
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-dark);
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: -300px;
    width: 300px;
    height: 100vh;
    background: #ffffff;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    z-index: 2000;
    transition: var(--transition);
}

.mobile-menu.active {
    left: 0;
}

.mobile-nav-menu {
    list-style: none;
    padding: 20px;
}

.mobile-nav-menu a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid #eee;
    text-decoration: none;
    color: var(--text-dark);
}

/* ==========================================
   首页样式
========================================== */
.page-home .hero-section {
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), 
                url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    color: #ffffff;
    text-align: center;
    padding: 100px 20px;
}

.hero-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.hero-content p {
    font-size: 20px;
    margin-bottom: 40px;
}

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

.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: #ffffff;
    border: 2px solid #ffffff;
}

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

/* ==========================================
   服务板块
========================================== */
.services-section {
    background: var(--bg-light);
    padding: 80px 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.service-card {
    background: #ffffff;
    padding: 40px 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-icon i {
    font-size: 36px;
    color: #ffffff;
}

.service-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.service-card p {
    color: var(--text-medium);
    line-height: 1.7;
}

/* ==========================================
   设备列表页
========================================== */
.page-machinery .page-title {
    text-align: center;
    font-size: 36px;
    margin: 40px 0;
}

.machinery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
    margin-bottom: 50px;
}

.machinery-card {
    background: #ffffff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

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

.machinery-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: var(--transition);
}

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

.machinery-info {
    padding: 20px;
}

.machinery-info h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.machinery-specs {
    font-size: 14px;
    color: var(--text-medium);
    margin-bottom: 15px;
}

.machinery-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    font-size: 13px;
    color: var(--text-light);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.enquiry-btn {
    display: block;
    width: 100%;
    padding: 12px;
    background: var(--primary-color);
    color: #ffffff;
    text-align: center;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

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

/* 加载更多按钮 */
.load-more-container {
    text-align: center;
    margin: 40px 0;
}

.load-more-btn {
    padding: 15px 40px;
    background: var(--primary-color);
    color: #ffffff;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 16px;
    transition: var(--transition);
}

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

.load-more-btn:disabled {
    background: var(--text-light);
    cursor: not-allowed;
}

/* ==========================================
   询盘表单
========================================== */
.enquiry-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.enquiry-form {
    max-width: 800px;
    margin: 0 auto;
    background: #ffffff;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-dark);
}

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

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 102, 0, 0.1);
}

/* 机器人检测 */
.spam-check {
    background: #fff9e6;
    padding: 20px;
    border-left: 4px solid var(--primary-color);
    margin: 20px 0;
}

.spam-check label {
    font-weight: 500;
    color: var(--text-dark);
}

.spam-check input {
    width: 100px;
    margin-left: 10px;
}

.submit-btn {
    width: 100%;
    padding: 15px;
    background: var(--primary-color);
    color: #ffffff;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.submit-btn i {
    margin-right: 8px;
}

/* 表单消息 */
.form-message {
    margin-top: 20px;
}

.form-message .success,
.form-message .error {
    padding: 15px;
    border-radius: var(--border-radius);
    font-weight: 500;
}

.form-message .success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-message .error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* ==========================================
   公司/关于页面
========================================== */
.company-images,
.about-images {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.company-images img,
.about-images img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--border-radius);
}

.company-content h3,
.about-text h3 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.values-list {
    list-style: none;
    margin-top: 20px;
}

.values-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    font-size: 16px;
}

.values-list i {
    color: var(--primary-color);
}

.company-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 40px;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 48px;
    font-weight: bold;
    color: var(--primary-color);
    line-height: 1;
}

.stat-label {
    font-size: 14px;
    color: var(--text-medium);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ==========================================
   品牌下拉
========================================== */
.brand-dropdown {
    padding: 60px 0;
}

.brand-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.brand-card {
    background: #ffffff;
    border: 2px solid #eee;
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    text-decoration: none;
    color: var(--text-dark);
    transition: var(--transition);
}

.brand-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

.brand-logo {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
}

.brand-logo img {
    max-height: 100%;
    width: auto;
    filter: grayscale(100%);
    transition: var(--transition);
}

.brand-card:hover .brand-logo img {
    filter: grayscale(0);
}

/* ==========================================
   页脚
========================================== */
.site-footer {
    background: var(--bg-dark);
    color: #ffffff;
    padding: 60px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h3 {
    margin-bottom: 20px;
    color: var(--primary-color);
}

.footer-col ul {
    list-style: none;
}

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

.footer-col a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 20px;
    text-align: center;
    color: #999;
    font-size: 14px;
}

/* ==========================================
   响应式设计
========================================== */
@media (max-width: 1024px) {
    .machinery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    /* 顶部条 */
    .top-bar .container {
        flex-direction: column;
        gap: 10px;
    }
    
    /* 头部 */
    .header-inner {
        flex-wrap: wrap;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .main-nav {
        display: none;
    }
    
    /* 首页英雄区 */
    .hero-content h1 {
        font-size: 32px;
    }
    
    .hero-content p {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    /* 表单 */
    .form-row {
        grid-template-columns: 1fr;
    }
    
    /* 设备网格 */
    .machinery-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    /* 公司图片 */
    .company-images,
    .about-images {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* 页脚 */
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    /* 字体大小 */
    body {
        font-size: 14px;
    }
    
    .section-title {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }
    
    .hero-content h1 {
        font-size: 24px;
    }
    
    .company-stats {
        grid-template-columns: 1fr;
    }
    
    .machinery-image img {
        height: 150px;
    }
}