/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* WhatsApp 回退样式 */
.whatsapp-fallback {
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 15px;
    margin: 15px 0;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.contact-notice {
    font-size: 16px;
    color: #495057;
    margin-bottom: 10px;
}

.contact-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background-color: #25d366;
    color: white;
    border: none;
    border-radius: 6px;
    padding: 10px 20px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 10px 0;
    box-shadow: 0 4px 6px rgba(37,211,102,0.2);
}

.contact-btn:hover {
    background-color: #128c7e;
    transform: translateY(-2px);
    box-shadow: 0 6px 8px rgba(37,211,102,0.3);
}

/* 基础页面样式 */
body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
    width: 100%;
    margin: 0;
    padding: 0;
}

html {
    width: 100%;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

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

/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, rgba(255,255,255,0.95) 0%, rgba(248,250,252,0.95) 100%);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    border-bottom: 1px solid rgba(255,255,255,0.2);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
}

.navbar:hover {
    box-shadow: 0 12px 40px rgba(0,0,0,0.15);
    transform: translateY(-1px);
}

.nav-container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0 80px;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    height: 75px;
    gap: 20px;
}

.nav-logo {
    position: relative;
    overflow: hidden;
    margin-right: auto;
    margin-left: 0;
    flex-shrink: 0;
    text-align: left;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    overflow: hidden;
    justify-content: flex-start;
}

.logo-icon {
    transition: all 0.3s ease;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
    transform-origin: 20px 20px;
}

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

.company-name {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 24px;
    font-weight: 700;
    margin: 0;
    line-height: 1.2;
    transition: all 0.3s ease;
}

.company-tagline {
    font-size: 11px;
    color: #64748b;
    font-weight: 500;
    letter-spacing: 0.5px;
    opacity: 0.8;
    transition: all 0.3s ease;
}

.logo-underline {
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
    transition: width 0.6s cubic-bezier(0.4,0,0.2,1);
}

.nav-logo:hover .logo-underline {
    width: 100%;
}

.nav-logo:hover h2 {
    transform: translateY(-2px);
}

.nav-logo:hover .logo-icon {
    transform: scale(1.05);
    filter: drop-shadow(0 4px 12px rgba(6,182,212,0.3));
}

.nav-logo:hover .company-name {
    background: linear-gradient(45deg, #06b6d4, #10b981, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transform: translateY(-1px);
}

.nav-logo:hover .company-tagline {
    color: #10b981;
    opacity: 1;
    transform: translateY(-1px);
}

.logo-icon g {
    transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

.logo-container:hover .logo-icon g {
    transform: scale(1.1);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
    align-items: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    text-decoration: none;
    color: #4a5568;
    font-weight: 600;
    font-size: 15px;
    padding: 12px 20px;
    border-radius: 25px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
    overflow: hidden;
}

.nav-text {
    position: relative;
    z-index: 2;
    transition: all 0.3s ease;
}

.nav-indicator {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 25px;
    transform: scale(0);
    transition: transform 0.4s cubic-bezier(0.4,0,0.2,1);
    z-index: 1;
}

.nav-link:hover {
    color: #ffffff;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(102,126,234,0.3);
}

.nav-link:hover .nav-indicator {
    transform: scale(1);
}

.nav-link:hover .nav-text {
    transform: scale(1.05);
}

.nav-link.active {
    color: #ffffff;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 8px 20px rgba(102,126,234,0.4);
}

.nav-link.active .nav-indicator {
    transform: scale(1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-toggle:hover {
    background: rgba(102,126,234,0.2);
    transform: scale(1.05);
    box-shadow: 0 6px 16px rgba(102,126,234,0.3);
}

.bar {
    width: 28px;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    margin: 3px 0;
    border-radius: 3px;
    transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
    box-shadow: 0 2px 4px rgba(102,126,234,0.3);
}

.nav-toggle:hover .bar {
    transform: scaleX(1.1);
    box-shadow: 0 3px 6px rgba(102,126,234,0.4);
}

.navbar.scrolled {
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(15px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    height: 65px;
}

.navbar.scrolled .nav-container {
    height: 65px;
}

.navbar.scrolled .nav-logo h2 {
    font-size: 22px;
}

/* 语言选择器样式 */
.language-selector {
    position: relative;
}

.language-dropdown {
    position: relative;
}

.language-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: none;
    color: #4a5568;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    padding: 12px 20px;
    border-radius: 25px;
    transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
    position: relative;
    overflow: hidden;
}

.language-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 25px;
    transform: scale(0);
    transition: transform 0.4s cubic-bezier(0.4,0,0.2,1);
    z-index: 1;
}

.language-btn:hover {
    color: #ffffff;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(102,126,234,0.3);
}

.language-btn:hover::before {
    transform: scale(1);
}

.language-btn > * {
    position: relative;
    z-index: 2;
}

.language-options {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    min-width: 140px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
    z-index: 1001;
    margin-top: 8px;
    backdrop-filter: blur(10px);
}

.language-dropdown.active .language-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-option {
    padding: 12px 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 14px;
    color: #374151;
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.language-option::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(102,126,234,0.1), transparent);
    transition: left 0.5s ease;
}

.language-option:hover::before {
    left: 100%;
}

.language-option:hover {
    background: linear-gradient(135deg, rgba(102,126,234,0.1), rgba(118,75,162,0.1));
    color: #667eea;
    transform: translateX(5px);
}

.language-option:first-child {
    border-radius: 12px 12px 0 0;
}

.language-option:last-child {
    border-radius: 0 0 12px 12px;
}

.language-option.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.language-option.active:hover {
    background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
    transform: translateX(0);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: #3498db;
    border: 2px solid #3498db;
}

.btn-secondary:hover {
    background: #3498db;
    color: white;
}

/* 英雄区域样式 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, rgba(255,255,255,0.3), transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.2), transparent),
        radial-gradient(1px 1px at 90px 40px, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 130px 80px, rgba(255,255,255,0.3), transparent),
        radial-gradient(2px 2px at 160px 30px, rgba(255,255,255,0.2), transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: particleMove 20s linear infinite;
}

@keyframes particleMove {
    0% { transform: translateY(0px); }
    100% { transform: translateY(-100px); }
}

.hero-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 120px;
    height: 120px;
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.shape-3 {
    width: 60px;
    height: 60px;
    top: 80%;
    left: 20%;
    animation-delay: 4s;
}

.shape-4 {
    width: 100px;
    height: 100px;
    top: 30%;
    right: 30%;
    animation-delay: 1s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
    }
}

.hero-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1.8fr;
    gap: 120px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 50px;
    padding: 8px 20px;
    margin-bottom: 20px;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.badge-text {
    font-size: 0.9rem;
    font-weight: 500;
    color: rgba(255,255,255,0.9);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.title-line-1, .title-line-2 {
    display: block;
    animation: fadeInUp 0.8s ease-out both;
}

.title-line-1 {
    animation-delay: 0.4s;
}

.title-line-2 {
    animation-delay: 0.6s;
    background: linear-gradient(45deg, #fff, #ecf0f1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #ecf0f1;
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #bdc3c7;
    line-height: 1.8;
    animation: fadeInUp 0.8s ease-out 1s both;
}

.hero-highlights {
    display: flex;
    gap: 30px;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease-out 1.2s both;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 25px;
    padding: 10px 15px;
    transition: all 0.3s ease;
}

.highlight-item:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.highlight-icon {
    width: 30px;
    height: 30px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.highlight-icon i {
    font-size: 0.9rem;
    color: #fff;
}

.highlight-item span {
    font-size: 0.9rem;
    font-weight: 500;
    color: rgba(255,255,255,0.9);
}

.hero-features {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease-out 1.2s both;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 25px;
    padding: 12px 18px;
    transition: all 0.3s ease;
}

.feature-item:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.feature-item i {
    font-size: 1.1rem;
    color: #fff;
    width: 20px;
    text-align: center;
}

.feature-item span {
    font-size: 0.95rem;
    font-weight: 500;
    color: rgba(255,255,255,0.9);
    white-space: nowrap;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    animation: fadeInUp 0.8s ease-out 1.4s both;
}

.btn-enhanced {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    position: relative;
    overflow: hidden;
}

.btn-enhanced::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn-enhanced:hover::before {
    left: 100%;
}

.btn-enhanced i {
    transition: transform 0.3s ease;
}

.btn-enhanced:hover i {
    transform: translateX(5px);
}

/* 图片轮播样式 */
.hero-image-carousel {
    flex: 1;
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 25px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
    perspective: 1200px;
}

.carousel-slides {
    display: flex;
    transition: transform 0.6s cubic-bezier(0.77,0,0.175,1);
}

.carousel-slide {
    min-width: 100%;
    box-sizing: border-box;
    opacity: 0;
    transition: opacity 0.8s ease, transform 0.8s ease;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    transform: scale(0.95);
}

.carousel-slide.active {
    opacity: 1;
    position: relative;
    transform: scale(1);
}

.hero-image-carousel img {
    width: 100%;
    display: block;
    border-radius: 25px;
    transition: transform 0.4s ease;
}

.hero-image-carousel:hover img {
    transform: scale(1.05);
}

.carousel-control {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(255,255,255,0.1);
    backdrop-filter: blur(8px);
    color: white;
    border: 1px solid rgba(255,255,255,0.2);
    width: 45px;
    height: 45px;
    cursor: pointer;
    border-radius: 50%;
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 18px;
}

.carousel-control:hover {
    background-color: rgba(255,255,255,0.2);
    transform: translateY(-50%) scale(1.1);
}

.carousel-control.prev {
    left: 15px;
}

.carousel-control.next {
    right: 15px;
}

.carousel-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    background: rgba(0,0,0,0.3);
    padding: 8px 15px;
    border-radius: 20px;
}

.carousel-dot {
    width: 12px;
    height: 12px;
    background-color: rgba(255,255,255,0.6);
    border: 2px solid white;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.4s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.carousel-dot.active {
    background-color: white;
    width: 30px;
    border-radius: 15px;
    box-shadow: 0 4px 12px rgba(255,255,255,0.4);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    animation: fadeInUp 0.8s ease-out 2s both;
}

.scroll-text {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: 10px;
}

.scroll-arrow {
    animation: bounce 2s infinite;
}

.scroll-arrow i {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.8);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 区域标题样式 */
.section-header {
    max-width: 1200px;
    margin: 0 auto 60px auto;
    padding: 0 20px;
    text-align: center;
}

.section-header h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 15px;
    position: relative;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: #3498db;
}

.section-header p {
    font-size: 1.2rem;
    color: #7f8c8d;
}

/* 关于我们区域 */
.about {
    padding: 100px 0;
    background: #f8f9fa;
}

.about-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    color: #2c3e50;
    margin-bottom: 20px;
}

.about-text p {
    font-size: 1.1rem;
    color: #555;
    margin-bottom: 20px;
    line-height: 1.8;
}

.company-stats {
    display: flex;
    gap: 40px;
    margin-top: 40px;
}

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

.stat-item h4 {
    font-size: 2.5rem;
    color: #3498db;
    font-weight: 700;
    margin-bottom: 10px;
}

.stat-item p {
    color: #7f8c8d;
    font-weight: 600;
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

/* 服务区域 */
.services {
    padding: 100px 0;
    background: white;
}

.services-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.service-card {
    background: white;
    padding: 40px 30px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 30px;
}

.service-icon i {
    font-size: 2rem;
    color: white;
}

.service-card h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 20px;
}

.service-card p {
    color: #7f8c8d;
    line-height: 1.6;
}

/* 联系我们区域 */
.contact {
    padding: 100px 0;
    background: #f8f9fa;
}

.contact-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: #3498db;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 20px;
    flex-shrink: 0;
    min-width: 60px;
    min-height: 60px;
}

.contact-icon i {
    font-size: 1.5rem;
    color: white;
}

.contact-details h4 {
    color: #2c3e50;
    margin-bottom: 5px;
    font-size: 1.2rem;
}

.contact-details p {
    color: #7f8c8d;
}

.contact-form {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #ecf0f1;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
}

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

.form-message {
    margin-top: 15px;
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(-10px);
}

.form-message.show {
    opacity: 1;
    transform: translateY(0);
}

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

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

.btn-primary {
    position: relative;
    overflow: hidden;
}

.btn-primary .loading-spinner {
    display: none;
    width: 16px;
    height: 16px;
    border: 2px solid #ffffff;
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 8px;
}

.btn-primary.loading .loading-spinner {
    display: inline-block;
}

.btn-primary.loading {
    pointer-events: none;
    opacity: 0.7;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.form-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.form-buttons .btn {
    flex: 1;
    min-width: 150px;
}

.btn-whatsapp {
    background: linear-gradient(135deg, #25d366, #128c7e);
    color: white;
    border: none;
    padding: 15px 25px;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}

.btn-whatsapp:hover {
    background: linear-gradient(135deg, #128c7e, #075e54);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(37,211,102,0.3);
}

.btn-whatsapp:active {
    transform: translateY(0);
}

.btn-whatsapp i {
    font-size: 18px;
}

/* 产品分类导航 */
.product-categories {
    padding: 2rem 0;
    border-bottom: 1px solid #e2e8f0;
}

.category-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.category-tab {
    background: white;
    border: 2px solid #e2e8f0;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    color: #64748b;
}

.category-tab:hover {
    border-color: #06b6d4;
    color: #06b6d4;
    transform: translateY(-2px);
}

.category-tab.active {
    background: #06b6d4;
    border-color: #06b6d4;
    color: white;
}

/* 产品展示区域 */
.products-grid {
    padding: 4rem 0;
    background: white;
}

.products-container {
    max-width: 1200px;
    margin: 2rem auto 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    justify-content: center;
}

.product-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #f1f5f9;
    max-width: 350px;
    margin: 0 auto;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.product-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

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

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

.product-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.view-details {
    background: #06b6d4;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.view-details:hover {
    background: #0891b2;
    transform: translateY(-2px);
}

.product-info {
    padding: 1.5rem;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.product-info h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.product-specs {
    color: #06b6d4;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.product-description {
    color: #64748b;
    line-height: 1.6;
    margin-bottom: 1rem;
    font-size: 0.95rem;
    max-width: 100%;
    word-break: break-word;
}

.product-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    max-width: 100%;
}

.feature-tag {
    background: #f1f5f9;
    color: #475569;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* 产品详情模态框 */
.product-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: white;
    margin: 2% auto;
    padding: 0;
    border-radius: 16px;
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.modal-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem 2rem;
    border-radius: 16px 16px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
}

.close-modal {
    font-size: 2rem;
    cursor: pointer;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.close-modal:hover {
    opacity: 1;
}

.modal-body {
    padding: 2rem;
}

.product-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.product-detail-image {
    text-align: center;
}

.product-detail-image img {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.product-detail-info h3 {
    color: #1e293b;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.product-detail-specs {
    background: #f8fafc;
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
}

.product-detail-specs h4 {
    color: #374151;
    margin-bottom: 1rem;
    font-weight: 600;
}

.specs-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.spec-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid #e5e7eb;
}

.spec-label {
    font-weight: 500;
    color: #6b7280;
}

.spec-value {
    font-weight: 600;
    color: #374151;
}

.product-features-detail {
    margin-top: 1.5rem;
}

.product-features-detail h4 {
    color: #374151;
    margin-bottom: 1rem;
    font-weight: 600;
}

.features-list {
    list-style: none;
    padding: 0;
}

.features-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #f3f4f6;
    position: relative;
    padding-left: 1.5rem;
}

.features-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: bold;
}

/* 产品筛选动画 */
.product-card.hidden {
    display: none;
}

.product-card.show {
    display: block;
    animation: fadeInUp 0.6s ease forwards;
}

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

/* 动力总成页面样式 */
.powertrain-section {
    padding: 60px 0;
    background-color: #f8f9fa;
}

.powertrain-grid {
    max-width: 1200px;
    margin: 40px auto 0 auto;
    padding: 0 20px;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.powertrain-item {
    display: flex;
    background-color: #f5f5f5;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
    position: relative;
    min-height: 200px;
}

.powertrain-item.animate {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.powertrain-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.powertrain-content {
    flex: 1;
    padding: 35px 30px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background-color: #e8e8e8;
    position: relative;
}

.powertrain-content::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 25px;
    height: 100%;
    background-color: #8b7355;
}

.powertrain-image {
    flex: 1;
    min-height: 200px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.powertrain-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.powertrain-content h3 {
    font-size: 26px;
    color: #333;
    margin-bottom: 18px;
    font-weight: 700;
    line-height: 1.4;
}

.powertrain-content h4 {
    font-size: 20px;
    color: #666;
    margin-bottom: 25px;
    font-weight: 500;
}

.powertrain-content p {
    color: #555;
    margin-bottom: 25px;
    line-height: 2.0;
    font-size: 16px;
    letter-spacing: 0.5px;
}

.powertrain-content .english-desc {
    color: #777;
    font-size: 14px;
    font-style: italic;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .powertrain-item {
        flex-direction: column;
    }
    
    .powertrain-image {
        min-height: 250px;
    }
}

/* 移动端响应式样式 */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 20px;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 75px;
        left: 0;
        width: 100%;
        height: calc(100vh - 75px);
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(15px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 50px;
        gap: 10px;
        transform: translateX(-100%);
        transition: transform 0.4s cubic-bezier(0.4,0,0.2,1);
        z-index: 999;
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(8px, -8px);
    }

    .navbar.scrolled .nav-menu {
        top: 65px;
        height: calc(100vh - 65px);
    }

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

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .title-line-1, .title-line-2 {
        font-size: 2.5rem;
    }

    .hero-highlights {
        flex-direction: column;
        gap: 15px;
    }

    .hero-features {
        flex-direction: column;
        gap: 15px;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .company-stats {
        flex-direction: column;
        gap: 20px;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .form-buttons {
        flex-direction: column;
    }

    .form-buttons .btn {
        width: 100%;
    }

    /* 产品页面移动端样式 */
    .products-hero {
        padding: 3rem 0 2rem 0;
    }

    .products-hero h1 {
        font-size: 2rem;
    }

    .category-tabs {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
        padding: 0 1rem;
    }

    .category-tab {
        width: 100%;
        max-width: 200px;
        text-align: center;
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }

    .products-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding: 0 1rem;
        margin-top: 1rem;
    }

    .product-card {
        max-width: 100%;
    }

    .product-image {
        height: 180px;
    }

    .product-info {
        padding: 1rem;
    }

    .product-info h3 {
        font-size: 1.1rem;
    }

    .product-description {
        font-size: 0.9rem;
    }

    .feature-tag {
        font-size: 0.75rem;
        padding: 0.2rem 0.6rem;
    }

    /* 产品详情模态框移动端 */
    .modal-content {
        width: 95%;
        margin: 5% auto;
        max-height: 85vh;
    }

    .modal-header {
        padding: 1rem 1.5rem;
    }

    .modal-header h2 {
        font-size: 1.25rem;
    }

    .modal-body {
        padding: 1.5rem;
    }

    .product-detail-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .product-detail-image img {
        max-width: 250px;
    }

    .specs-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .spec-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }

    .spec-value {
         font-size: 0.9rem;
     }

    /* 动力总成页面移动端样式 */
    .powertrain-section {
        padding: 40px 0;
    }
    
    .powertrain-content {
        padding: 35px 25px;
    }
    
    .powertrain-content h3 {
        font-size: 20px;
    }
    
    .powertrain-content h4 {
        font-size: 16px;
    }
    
    .powertrain-image {
        min-height: 200px;
    }
    
    .powertrain-content::after {
        top: auto;
        bottom: 0;
        right: 0;
        left: 0;
        width: 100%;
        height: 25px;
    }
 }

@media (max-width: 480px) {
    .powertrain-content {
        padding: 25px 20px;
    }
    
    .powertrain-content h3 {
        font-size: 18px;
    }
    
    .powertrain-content h4 {
        font-size: 14px;
    }
    
    .powertrain-content p {
        font-size: 14px;
    }
    
    .powertrain-content .english-desc {
        font-size: 12px;
    }
    
    .powertrain-image {
        min-height: 180px;
    }
 }

/* Footer Styles */
.footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 100px 0;
    font-size: 15px;
    line-height: 1.8;
}

.footer .container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 30px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    width: 100%;
}

.footer-section {
    flex: 1;
    min-width: 250px;
    margin-bottom: 30px;
}

.footer-section h3,
.footer-section h4 {
    color: #ffffff;
    font-size: 18px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h3::after,
.footer-section h4::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 50px;
    height: 3px;
    background-color: #3498db;
}

.footer-section p,
.footer-section ul {
    margin-bottom: 15px;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

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

.footer-section ul li a {
    color: #ecf0f1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #3498db;
}

.footer-section .fas {
    margin-right: 10px;
    color: #3498db;
}

.footer-bottom {
    width: 100%;
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 30px;
    color: #bdc3c7;
}

@media (max-width: 768px) {
    .footer {
        min-height: auto;
        padding: 70px 0 80px 0;
    }

    .footer .container {
        flex-direction: column;
        align-items: center;
        min-height: auto;
    }

    .footer-content {
        flex-direction: column;
        align-items: center;
        gap: 40px;
        min-height: auto;
    }

    .footer-section {
        text-align: left;
        min-width: unset;
        width: 100%;
        max-width: none;
        margin-bottom: 40px;
        padding: 0 20px;
        min-height: auto;
    }

    .footer-section h3::after,
    .footer-section h4::after {
        left: 0;
        transform: none;
    }

    .footer-section p {
        word-wrap: break-word;
        overflow-wrap: break-word;
        white-space: normal;
        line-height: 1.6;
    }

    .footer-section ul li {
        margin-bottom: 12px;
        line-height: 1.6;
    }
}

@media (max-width: 480px) {
    .footer {
        padding: 70px 0 90px 0;
        min-height: auto;
    }

    .footer .container {
        min-height: auto;
    }

    .footer-content {
        gap: 35px;
        min-height: auto;
    }

    .footer-section {
        padding: 0 15px;
        margin-bottom: 40px;
        min-height: auto;
    }

    .footer-section h3,
    .footer-section h4 {
        font-size: 16px;
        margin-bottom: 18px;
    }

    .footer-section p {
        font-size: 14px;
        line-height: 1.8;
        margin-bottom: 15px;
    }

    .footer-section ul li {
        font-size: 14px;
        margin-bottom: 12px;
        line-height: 1.8;
    }

    .footer-bottom {
        padding-top: 40px;
        margin-top: 40px;
    }
}