/**
 * 主样式表 - 响应式设计
 * 清新家环保科技
 */

/* ===== CSS变量 ===== */
:root {
    --primary-color: #00a8a8;
    --primary-dark: #008b8b;
    --primary-light: #e6f7f7;
    --secondary-color: #f39c12;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.15);
    --radius: 8px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
    --header-height: 70px;
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-light);
}

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

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

ul {
    list-style: none;
}

/* ===== 布局容器 ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

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

.section-title h2 {
    font-size: 2.2rem;
    color: var(--text-dark);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-color);
}

.section-title p {
    color: var(--text-light);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 20px auto 0;
}

/* ===== 按钮样式 ===== */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: var(--radius);
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 1rem;
}

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

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

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

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

.btn-large {
    padding: 15px 40px;
    font-size: 1.1rem;
}

/* ===== 头部导航 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: var(--shadow);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 45px;
    height: 45px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-dark);
}

.logo-text span {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    gap: 35px;
}

.nav-menu a {
    font-weight: 500;
    position: relative;
    padding: 5px 0;
}

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

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

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

.header-phone {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.1rem;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

/* ===== 轮播图 ===== */
.hero-slider {
    position: relative;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
}

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

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

.hero-slide-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
}

.hero-slide-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    max-width: 800px;
    padding: 0 20px;
    margin-top: 550px;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 30px;
    opacity: 0.95;
}

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

.hero-buttons .btn-secondary {
    border-color: white;
    color: white;
}

.hero-buttons .btn-secondary:hover {
    background: white;
    color: var(--primary-color);
}

.slider-dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 3;
}

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

.slider-dot.active {
    background: white;
    width: 30px;
    border-radius: 6px;
}

/* ===== 特色服务 ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.service-card {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.service-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 2rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.service-card:hover .service-icon {
    background: var(--primary-color);
    color: white;
}

.service-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

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

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

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

.about-text h2 {
    font-size: 2.2rem;
    margin-bottom: 25px;
    color: var(--text-dark);
}

.about-text p {
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.9;
}

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

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

.stat-label {
    color: var(--text-light);
    font-size: 0.95rem;
}

.about-image {
    position: relative;
}

.about-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.about-experience {
    position: absolute;
    bottom: -20px;
    left: -20px;
    background: var(--primary-color);
    color: white;
    padding: 25px 35px;
    border-radius: var(--radius);
    text-align: center;
}

.about-experience .years {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1;
}

.about-experience .text {
    font-size: 1rem;
    opacity: 0.9;
}

/* ===== 工艺工法 ===== */
.process-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.process-section .section-title h2,
.process-section .section-title p {
    color: white;
}

.process-section .section-title h2::after {
    background: white;
}

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

.process-item {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    padding: 35px;
    border-radius: var(--radius-lg);
    text-align: center;
    position: relative;
    border: 1px solid rgba(255,255,255,0.2);
}

.process-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: white;
    color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

.process-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    opacity: 0.9;
}

.process-item h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
}

.process-item p {
    opacity: 0.9;
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===== 案例展示 ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

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

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

.case-image {
    position: relative;
    height: 240px;
    overflow: hidden;
}

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

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

.case-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,168,168,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

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

.case-type {
    position: absolute;
    top: 15px;
    left: 15px;
    background: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
}

.case-content {
    padding: 25px;
}

.case-content h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.case-meta {
    display: flex;
    gap: 20px;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.case-meta i {
    margin-right: 5px;
    color: var(--primary-color);
}

.case-content p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===== 科普文章 ===== */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

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

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

.article-image {
    height: 200px;
    overflow: hidden;
}

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

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

.article-content {
    padding: 25px;
}

.article-category {
    color: var(--primary-color);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.article-content h3 {
    font-size: 1.15rem;
    margin-bottom: 12px;
    line-height: 1.4;
}

.article-content p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 15px;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    color: var(--text-light);
    font-size: 0.85rem;
}

/* ===== 联系表单 ===== */
.contact-section {
    background: var(--bg-white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-detail h4 {
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.contact-detail p {
    color: var(--text-light);
}

.contact-form {
    background: var(--bg-light);
    padding: 40px;
    border-radius: var(--radius-lg);
}

.form-group {
    margin-bottom: 25px;
}

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

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

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

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

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

.btn-submit {
    width: 100%;
    padding: 16px;
    font-size: 1.1rem;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 60px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo-text {
    color: white;
    font-size: 1.6rem;
    margin-bottom: 20px;
}

.footer-brand p {
    opacity: 0.8;
    line-height: 1.8;
    margin-bottom: 25px;
}

.footer-social {
    display: flex;
    gap: 15px;
}

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

.footer-social a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer h4 {
    font-size: 1.2rem;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 10px;
}

.footer h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--primary-color);
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-contact p {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    opacity: 0.8;
}

.footer-bottom {
    padding: 25px 0;
    text-align: center;
    opacity: 0.7;
    font-size: 0.95rem;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title h2 {
        font-size: 1.8rem;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background: var(--bg-white);
        flex-direction: column;
        padding: 40px;
        transition: var(--transition);
        box-shadow: var(--shadow);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu a {
        font-size: 1.2rem;
        padding: 15px 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .header-phone {
        display: none;
    }
    
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-buttons .btn {
        width: 200px;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .about-experience {
        position: relative;
        bottom: auto;
        left: auto;
        margin-top: 20px;
        display: inline-block;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer h4::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .footer-contact p {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .service-card {
        padding: 30px 20px;
    }
    
    .contact-form {
        padding: 25px;
    }
}