/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
}

/* 导航栏样式 */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

/* 语言选择器样式 */
.language-selector {
    display: flex;
    gap: 0.5rem;
    margin-left: 2rem;
}

.lang-btn {
    background: #f8f9fa;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #333;
}

.lang-btn:hover {
    background: #e74c3c;
    color: white;
    border-color: #e74c3c;
    transform: translateY(-2px);
}

.lang-btn.active {
    background: #e74c3c;
    color: white;
    border-color: #e74c3c;
    box-shadow: 0 2px 8px rgba(231, 76, 60, 0.3);
}

.nav-logo h2 {
    color: #e74c3c;
    font-size: 1.8rem;
    flex-shrink: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0 auto;
    justify-content: center;
    flex-shrink: 0;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #e74c3c;
}

/* 首页横幅 - 全新现代设计 */
.hero {
    background: 
        linear-gradient(135deg, #0c0c0c 0%, #1a1a2e 25%, #16213e 50%, #0f3460 75%, #e74c3c 100%),
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.1) 0%, transparent 50%),
        url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="hex" width="20" height="20" patternUnits="userSpaceOnUse"><path d="M10 0L20 5.77L20 17.32L10 23.09L0 17.32L0 5.77Z" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.3"/></pattern></defs><rect width="100" height="100" fill="url(%23hex)"/></svg>');
    color: white;
    padding: 120px 0 80px;
    text-align: center;
    margin-top: 70px;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(45deg, transparent 30%, rgba(231, 76, 60, 0.1) 50%, transparent 70%);
    animation: scan 8s linear infinite;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.8), transparent);
    animation: scanline 4s ease-in-out infinite;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, #ffffff 0%, #ffd700 25%, #e74c3c 50%, #ff6b6b 75%, #ffffff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(231, 76, 60, 0.3);
    line-height: 1.1;
}

.hero-content p {
    font-size: 1.4rem;
    margin-bottom: 3rem;
    opacity: 0.95;
    line-height: 1.7;
    text-shadow: 0 2px 15px rgba(0, 0, 0, 0.5);
    font-weight: 300;
    letter-spacing: 0.5px;
}

.cta-button {
    background: linear-gradient(135deg, #ff6b6b 0%, #e74c3c 50%, #c0392b 100%);
    color: white;
    padding: 15px 35px;
    border: none;
    border-radius: 8px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(231, 76, 60, 0.4);
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

.cta-button:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 15px 35px rgba(231, 76, 60, 0.6);
}

.cta-button:hover::before {
    left: 100%;
}

/* 英雄区特性列表 - 全新设计 */
.hero-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin: 3rem 0;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.2rem 1.5rem;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(231, 76, 60, 0.15) 100%);
    border-radius: 12px;
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.feature-item::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 0.6s ease;
}

.feature-item:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, rgba(231, 76, 60, 0.25) 100%);
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
}

.feature-item:hover::before {
    left: 100%;
}

.feature-icon {
    font-size: 2rem;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.5));
    animation: float 3s ease-in-out infinite;
}

.feature-item span:last-child {
    font-size: 1rem;
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.7);
    letter-spacing: 0.5px;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .hero-features {
        grid-template-columns: 1fr;
        gap: 0.8rem;
    }
    
    .feature-item {
        padding: 0.7rem 1rem;
    }
    
    .feature-item span:last-child {
        font-size: 0.85rem;
    }
}

/* 全新动画效果 */
@keyframes scan {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

@keyframes scanline {
    0%, 100% { top: 0; opacity: 0; }
    50% { top: 50%; opacity: 1; }
}

@keyframes titleGlow {
    0% { 
        text-shadow: 0 0 30px rgba(231, 76, 60, 0.5), 0 0 60px rgba(231, 76, 60, 0.3);
        transform: scale(1);
    }
    100% { 
        text-shadow: 0 0 50px rgba(231, 76, 60, 0.8), 0 0 80px rgba(231, 76, 60, 0.5);
        transform: scale(1.02);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

/* 响应式调整 */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
    }
    
    .cta-button {
        padding: 12px 25px;
        font-size: 1.1rem;
    }
}

/* 产品分类 */
.products-section {
    padding: 80px 0;
    background: #fff;
}

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

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #333;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.category-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.category-card:hover {
    transform: translateY(-5px);
    border-color: #e74c3c;
    box-shadow: 0 10px 30px rgba(231, 76, 60, 0.1);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* 产品展示 */
.product-showcase {
    padding: 80px 0;
    background: #f8f9fa;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.product-card {
    background: #fff;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    height: 362px;
    perspective: 1000px;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.product-card:hover .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front, .flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    padding: 2rem;
}

.flip-card-front {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.flip-card-back {
    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
    color: white;
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow-y: auto;
    padding: 1.5rem;
}

.flip-card-back * {
    color: white !important;
}

.product-seo-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.product-seo-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    line-height: 1.3;
    color: #fff;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

.product-seo-description {
    font-size: 0.9rem;
    line-height: 1.5;
    opacity: 0.95;
    margin-bottom: 0.5rem;
}

.product-specs h5,
.product-applications h5 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #ffd700;
}

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

.product-features li {
    font-size: 0.85rem;
    margin-bottom: 0.3rem;
    padding-left: 1rem;
    position: relative;
}

.product-features li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: #ffd700;
}

.product-applications p {
    font-size: 0.85rem;
    line-height: 1.4;
    opacity: 0.9;
}

.product-keywords-section {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid rgba(255,255,255,0.3);
}

.product-keywords {
    font-size: 0.8rem;
    opacity: 0.8;
    font-style: italic;
}

.product-image {
    width: 100%;
    height: 210px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 0.5rem;
    background: #f8f9fa;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    font-size: 14px;
}

.product-info h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.product-info p {
    color: #666;
    font-size: 0.9rem;
}

.product-actions {
    display: none;
    margin-top: 1rem;
}

.view-details {
    background: linear-gradient(135deg, #ff6b6b 0%, #e74c3c 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.3);
    text-decoration: none;
    text-align: center;
    display: inline-block;
}

.view-details:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(231, 76, 60, 0.4);
    background: linear-gradient(135deg, #ff7b7b 0%, #f05a4a 100%);
}

/* 关于我们 */
.about-section {
    padding: 80px 0;
    background: #fff;
}

.about-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 2rem;
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.advantages {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.advantage-item {
    text-align: center;
    padding: 2rem;
    background: #f8f9fa;
    border-radius: 10px;
}

.advantage-item h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #e74c3c;
}

/* 联系我们 */
.contact-section {
    padding: 80px 0;
    background: #f8f9fa;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.contact-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: #333;
}

.contact-info p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-form input,
.contact-form textarea {
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    font-family: inherit;
}

.contact-form button {
    background: #e74c3c;
    color: white;
    padding: 12px;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.3s ease;
}

.contact-form button:hover {
    background: #c0392b;
}

.form-note {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.5;
}

.form-status {
    color: #257942;
    font-size: 0.95rem;
    min-height: 1.5em;
}

/* 页脚 */
.footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 2rem 0;
}

/* 语言选择器样式 */
.language-selector {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-left: auto;
    margin-right: 1rem;
}

.lang-btn {
    background: transparent;
    border: 1px solid #ddd;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    color: #666;
}

.lang-btn:hover {
    border-color: #e74c3c;
    color: #e74c3c;
}

.lang-btn.active {
    background: #e74c3c;
    border-color: #e74c3c;
    color: white;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 1rem 0;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    }

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

    .nav-toggle {
        display: block !important;
        background: none;
        border: none;
        font-size: 1.5rem;
        cursor: pointer;
        color: #333;
    }

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

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

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

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

    .product-card {
        height: auto;
        min-height: 410px;
        perspective: none;
    }

    .flip-card-inner {
        position: static;
        height: auto;
        transform-style: flat;
    }

    .product-card:hover .flip-card-inner {
        transform: none;
    }

    .flip-card-front {
        position: static;
        min-height: 410px;
    }

    .flip-card-back {
        display: none;
    }

    .product-actions {
        display: block;
    }

    .view-details-front {
        width: 100%;
    }
    
    .language-selector {
        margin-right: 0;
        margin-left: auto;
    }
    
    .lang-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}