/* 上海彤特环保科技服务中心 - 企业官网样式 */

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

:root {
    --primary-color: #2d8659;
    --primary-dark: #1f5d3f;
    --primary-light: #4db380;
    --secondary-color: #f0f8f4;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --white: #ffffff;
    --gray-light: #f5f5f5;
    --border-color: #e0e0e0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', '微软雅黑', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

/* 语言切换 */
.lang-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    gap: 10px;
    background: var(--white);
    padding: 8px 12px;
    border-radius: 25px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.lang-switcher a {
    text-decoration: none;
    color: var(--text-dark);
    padding: 5px 12px;
    border-radius: 15px;
    transition: all 0.3s;
    font-weight: 500;
}

.lang-switcher a.active {
    background: var(--primary-color);
    color: var(--white);
}

.lang-switcher a:hover {
    background: var(--secondary-color);
}

/* 导航栏 */
.navbar {
    background: var(--white);
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 999;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s;
}

.nav-menu a:hover::after {
    width: 100%;
}

/* 响应式导航 */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-dark);
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 100px 20px;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.95;
}

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

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: var(--white);
}

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

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 部分标题 */
.section {
    padding: 80px 20px;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.section-title p {
    font-size: 18px;
    color: var(--text-light);
}

/* 服务网格 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.service-card {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
    border-top: 4px solid var(--primary-color);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.service-icon {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.service-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* 关于我们 */
.about-section {
    background: var(--secondary-color);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text {
    background: var(--white);
    padding: 50px;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.08);
    position: relative;
}

.about-text::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: 15px 0 0 15px;
}

.about-text h3 {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 25px;
    padding-left: 20px;
}

.about-text p {
    margin-bottom: 20px;
    color: var(--text-dark);
    line-height: 2;
    font-size: 16px;
    padding-left: 20px;
}

.about-text p:last-child {
    margin-bottom: 0;
}

.about-text .company-name {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid var(--secondary-color);
}

.about-text .company-name strong {
    color: var(--primary-color);
    font-size: 18px;
    white-space: nowrap;
}

.about-text .company-name span {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
}

/* 统计信息卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.stat-card {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.stat-number {
    font-size: 48px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-label {
    font-size: 16px;
    color: var(--text-light);
    font-weight: 500;
}

/* 联系表单 */
.contact-section {
    background: var(--gray-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
}

.contact-info {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 50px 40px;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
    color: var(--white);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact-info h3 {
    font-size: 28px;
    color: var(--white);
    margin-bottom: 40px;
    text-align: center;
}

.contact-item {
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    backdrop-filter: blur(10px);
    transition: background 0.3s;
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.15);
}

.contact-item:last-child {
    margin-bottom: 0;
}

.contact-icon {
    font-size: 32px;
    color: var(--white);
    flex-shrink: 0;
}

.contact-item-content h4 {
    margin-bottom: 8px;
    color: var(--white);
    font-size: 14px;
    opacity: 0.9;
    font-weight: 500;
}

.contact-item-content p {
    color: var(--white);
    font-size: 16px;
    font-weight: 600;
}

.contact-form {
    background: var(--white);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

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

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 16px;
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.btn-submit {
    width: 100%;
    background: var(--primary-color);
    color: var(--white);
    padding: 14px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

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

/* 页脚 */
.footer {
    background: var(--text-dark);
    color: var(--white);
    padding: 40px 20px;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer p {
    margin-bottom: 10px;
    opacity: 0.9;
}

.footer a {
    color: var(--primary-light);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* 经营范围优化 */
.about-content .about-text p {
    text-align: justify;
}

.about-content .about-text p:last-of-type {
    text-align: left;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    }

    .nav-menu.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero p {
        font-size: 18px;
    }

    .about-content {
        max-width: 100%;
    }
    
    .about-text {
        padding: 30px 20px;
    }
    
    .about-text h3 {
        font-size: 24px;
        padding-left: 0;
    }
    
    .about-text p {
        padding-left: 0;
        font-size: 15px;
    }
    
    .about-text .company-name {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .about-text .company-name strong,
    .about-text .company-name span {
        font-size: 16px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        margin-top: 30px;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        padding: 40px 30px;
    }

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

    .lang-switcher {
        top: 10px;
        right: 10px;
        padding: 6px 10px;
    }

    .lang-switcher a {
        padding: 4px 10px;
        font-size: 14px;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 滚动平滑 */
html {
    scroll-behavior: smooth;
}