/* ========================================
   山西义友清洁设备有限公司 - 官网样式
   ======================================== */

/* CSS Variables */
:root {
    --primary-color: #FFC107;
    --primary-dark: #FFA000;
    --secondary-color: #1a1a1a;
    --accent-color: #FF5722;
    --text-dark: #333333;
    --text-light: #666666;
    --bg-light: #f8f9fa;
    --white: #ffffff;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

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

.section {
    padding: 80px 0;
}

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

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-light);
}

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

.mt-8 {
    margin-top: 32px;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow);
    z-index: 1000;
    height: 70px;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo img {
    height: 50px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0;
}

.nav-item {
    position: relative;
}

.nav-item > a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 28px 0;
    margin: 0 12px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-dark);
    white-space: nowrap;
    transition: var(--transition);
}

.nav-item > a:hover {
    color: var(--primary-dark);
}

/* Dropdown */
.dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--white);
    min-width: 340px;
    padding: 25px 35px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
    border-radius: 12px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 100;
}

.nav-item:hover .dropdown {
    opacity: 1;
    visibility: visible;
}

.dropdown-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

.dropdown-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.dropdown-grid a,
.dropdown-links a {
    display: block;
    padding: 8px 0;
    color: var(--text-light);
    font-size: 0.95rem;
}

.dropdown-grid a:hover,
.dropdown-links a:hover {
    color: var(--primary-dark);
}

.dropdown-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 5px 20px;
}

/* 下拉菜单 - 新结构 */
.dropdown {
    display: flex;
    flex-wrap: wrap;
}

.dropdown-section {
    flex: 1;
    min-width: 200px;
    margin-bottom: 20px;
}

.dropdown-section:last-child {
    margin-bottom: 0;
}

.dropdown-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--secondary-color);
    padding-bottom: 12px;
    margin-bottom: 12px;
    border-bottom: 1px solid #eee;
}

.dropdown-item {
    display: block;
    padding: 10px 0;
    color: var(--text-light);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
    line-height: 1.4;
}

.dropdown-item:hover {
    color: var(--primary-dark);
}

/* Nav Actions */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.search-box {
    display: flex;
    align-items: center;
    border: 1px solid #ddd;
    border-radius: 20px;
    overflow: hidden;
}

.search-box input {
    border: none;
    padding: 8px 15px;
    width: 180px;
    outline: none;
}

.search-box button {
    border: none;
    background: transparent;
    padding: 8px 15px;
    cursor: pointer;
    color: var(--text-light);
}

/* Buttons */
.btn-primary {
    display: inline-block;
    padding: 12px 30px;
    background: var(--primary-color);
    color: var(--secondary-color);
    font-weight: 600;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-outline-white {
    display: inline-block;
    padding: 12px 30px;
    background: transparent;
    color: var(--white);
    font-weight: 600;
    border-radius: 4px;
    border: 2px solid var(--white);
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-white {
    display: inline-block;
    padding: 12px 30px;
    background: var(--white);
    color: var(--secondary-color);
    font-weight: 600;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-white:hover {
    transform: translateY(-2px);
}

.btn-primary-outline {
    display: inline-block;
    padding: 12px 30px;
    background: transparent;
    color: var(--primary-dark);
    font-weight: 600;
    border-radius: 4px;
    border: 2px solid var(--primary-color);
    cursor: pointer;
    transition: var(--transition);
}

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

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* ========================================
   Hero Slider
   ======================================== */
.hero {
    margin-top: 70px;
    position: relative;
    height: 600px;
    overflow: hidden;
}

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

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.8s ease;
}

.slide.active {
    opacity: 1;
}

.slide-content {
    text-align: center;
    color: var(--white);
    max-width: 800px;
    padding: 0 20px;
}

.slide-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

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

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

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

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

.slider-dots .dot.active {
    background: var(--white);
    transform: scale(1.2);
}

/* ========================================
   Products Section
   ======================================== */
.products-section {
    background: var(--white);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.product-card {
    background: var(--white);
    border-radius: 12px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.product-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.product-icon i {
    font-size: 2rem;
    color: var(--white);
}

.product-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.product-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 20px;
}

.product-link {
    color: var(--primary-dark);
    font-weight: 500;
}

.product-link i {
    margin-left: 5px;
    transition: var(--transition);
}

.product-link:hover i {
    transform: translateX(5px);
}

/* ========================================
   Solutions Section
   ======================================== */
.solutions-section {
    background: var(--bg-light);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.solution-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.solution-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.solution-image {
    height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.solution-image i {
    font-size: 4rem;
    color: var(--white);
    opacity: 0.9;
}

.solution-content {
    padding: 25px;
}

.solution-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.solution-content p {
    font-size: 0.95rem;
    color: var(--text-light);
}

/* ========================================
   Why Section
   ======================================== */
.why-section {
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    text-align: center;
    padding: 40px 20px;
    border-radius: 12px;
    background: linear-gradient(135deg, #f8f9fa, #ffffff);
    border: 1px solid #eee;
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.feature-icon i {
    font-size: 1.8rem;
    color: var(--white);
}

.feature-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-light);
}

/* ========================================
   Clients Section
   ======================================== */
.clients-section {
    background: var(--bg-light);
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 30px;
}

.client-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.client-logo:hover {
    transform: translateY(-5px);
}

.client-logo i {
    font-size: 2.5rem;
    color: var(--primary-dark);
    margin-bottom: 10px;
}

.client-logo span {
    font-size: 0.95rem;
    color: var(--text-dark);
    font-weight: 500;
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    padding: 80px 0;
}

.cta-content {
    text-align: center;
    color: var(--secondary-color);
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

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

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--secondary-color);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 50px;
    margin-bottom: 40px;
}

.footer-col h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.footer-col > p {
    color: rgba(255,255,255,0.8);
    margin-bottom: 20px;
    line-height: 1.8;
}

.footer-contact p {
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255,255,255,0.8);
    margin-bottom: 10px;
}

.footer-contact i {
    color: var(--primary-color);
    width: 20px;
}

.footer-col h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--primary-color);
}

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

.footer-col ul li a {
    color: rgba(255,255,255,0.8);
    font-size: 0.95rem;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1200px) {
    .nav-links {
        gap: 20px;
    }
    
    .dropdown {
        min-width: 600px;
    }
    
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .dropdown {
        position: static;
        transform: none;
        box-shadow: none;
        min-width: auto;
        padding: 10px 0;
    }
    
    .hero {
        height: 500px;
    }
    
    .slide-content h1 {
        font-size: 2rem;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .clients-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .hero {
        height: 400px;
    }
    
    .slide-content h1 {
        font-size: 1.6rem;
    }
    
    .slide-content p {
        font-size: 1rem;
    }
    
    .Slide-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .section {
        padding: 50px 0;
    }
    
    .section-header h2 {
        font-size: 1.8rem;
    }
    
    .product-grid,
    .solutions-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .clients-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cta-content h2 {
        font-size: 1.8rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

/* ========================================
   Animation
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fadeIn {
    animation: fadeIn 0.6s ease forwards;
}