/* 全局样式 */
:root {
    --primary-color: #000000;
    --secondary-color: #ffffff;
    --accent-color: #ff4d00;
    --text-color: #333333;
    --light-gray: #f5f5f5;
    --dark-gray: #666666;
    --border-color: #e0e0e0;
    --transition: all 0.3s ease;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 16px rgba(0, 0, 0, 0.2);
    --gradient-primary: linear-gradient(135deg, #ff4d00 0%, #ff6b00 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a1a 0%, #333333 100%);
    --tech-glow: 0 0 10px rgba(255, 77, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* 顶部信息栏 */
.top-bar {
    background: var(--primary-color);
    color: var(--secondary-color);
    padding: 10px 0;
    font-size: 14px;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1001;
}

.top-bar .container {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 40px;
}

.top-bar .contact-info {
    display: flex;
    gap: 30px;
}

.top-bar .contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.top-bar .contact-item i {
    color: var(--accent-color);
}

.top-bar .social-links {
    display: flex;
    gap: 20px;
    margin-left: auto;
}

.top-bar .social-links a {
    color: var(--secondary-color);
    opacity: 0.8;
    transition: var(--transition);
}

.top-bar .social-links a:hover {
    opacity: 1;
    color: var(--accent-color);
}

/* 导航栏 */
.fullscreen-nav {
    position: fixed;
    top: 40px;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.fullscreen-nav.scrolled {
    top: 0;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.nav-header {
    display: flex;
    align-items: center;
    gap: 40px;
}

.logo img {
    height: 30px;
    transition: var(--transition);
}

.logo:hover img {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    position: relative;
    padding: 8px 0;
    transition: var(--transition);
}

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

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

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-color);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-search,
.nav-cart {
    color: var(--primary-color);
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.nav-search:hover,
.nav-cart:hover {
    color: var(--accent-color);
    transform: scale(1.1);
}

/* 主横幅 */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--secondary-color);
    overflow: hidden;
    margin-top: 120px;
}

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

.hero-background video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.7);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0,0,0,0.3), rgba(0,0,0,0.7));
}

.hero-content {
    position: relative;
    z-index: 3;
    max-width: 800px;
    padding: 2rem;
}

.hero-text h1 {
    font-size: 4.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-text p {
    font-size: 1.4rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

.action-btn {
    padding: 1.2rem 2.5rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.action-btn.primary {
    background: var(--accent-color);
    color: var(--secondary-color);
    border: none;
}

.action-btn.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(255, 77, 0, 0.3);
}

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

.action-btn.secondary:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
    transform: translateY(-3px);
}

/* 产品展示 */
.products {
    padding: 6rem 0;
    background: var(--light-gray);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.section-header p {
    font-size: 1.2rem;
    color: var(--dark-gray);
    max-width: 600px;
    margin: 0 auto;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.product-card {
    background: var(--secondary-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.product-media {
    position: relative;
    height: 250px;
    overflow: hidden;
}

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

.product-card:hover .product-media img {
    transform: scale(1.1);
}

.product-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 2rem;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: var(--secondary-color);
}

.product-overlay h3 {
    font-size: 1.5rem;
    margin-bottom: 0.8rem;
    font-weight: 600;
}

.product-overlay p {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: 1.2rem;
}

.product-details {
    padding: 2rem;
}

.product-specs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.spec {
    text-align: center;
}

.spec .value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.spec .label {
    font-size: 1rem;
    color: var(--dark-gray);
}

/* 解决方案 */
.solutions {
    padding: 6rem 0;
    background: var(--secondary-color);
}

.solutions-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

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

.solution-slide:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.solution-content {
    padding: 2rem;
}

.solution-content h3 {
    font-size: 1.8rem;
    margin-bottom: 1.2rem;
    color: var(--primary-color);
}

.solution-content p {
    color: var(--dark-gray);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.solution-features {
    margin: 1.5rem 0;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.solution-features li,
.solution-features span {
    background: var(--light-gray);
    padding: 0.8rem 1.2rem;
    border-radius: 4px;
    font-size: 1rem;
    color: var(--dark-gray);
    transition: var(--transition);
}

.solution-features li:hover,
.solution-features span:hover {
    background: var(--accent-color);
    color: var(--secondary-color);
    transform: translateY(-2px);
}

.solution-image {
    height: 250px;
    overflow: hidden;
}

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

.solution-slide:hover .solution-image img {
    transform: scale(1.1);
}

/* 关于我们 */
.about {
    padding: 6rem 0;
    background: var(--light-gray);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h2 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--accent-color);
}

.about-text p {
    color: var(--dark-gray);
    margin-bottom: 2rem;
    line-height: 1.8;
    font-size: 1.1rem;
}

.company-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.stat {
    text-align: center;
    padding: 2rem;
    background: var(--secondary-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.stat .number {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.stat .label {
    font-size: 1.1rem;
    color: var(--dark-gray);
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

/* 联系我们 */
.contact {
    padding: 6rem 0;
    background: var(--secondary-color);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info h2 {
    font-size: 3.5rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--light-gray);
    border-radius: 8px;
    transition: var(--transition);
}

.info-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.info-item i {
    font-size: 2rem;
    color: var(--accent-color);
}

.info-item h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.info-item p {
    color: var(--dark-gray);
    line-height: 1.6;
}

.contact-form {
    background: var(--light-gray);
    padding: 3rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 2rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(255, 77, 0, 0.1);
}

.form-group textarea {
    height: 150px;
    resize: vertical;
}

.form-message {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 4px;
    text-align: center;
    font-size: 1rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.form-message.success {
    background-color: rgba(76, 175, 80, 0.1);
    color: #2e7d32;
    opacity: 1;
    visibility: visible;
}

.form-message.error {
    background-color: rgba(244, 67, 54, 0.1);
    color: #d32f2f;
    opacity: 1;
    visibility: visible;
}

.submit-btn {
    width: 100%;
    padding: 1.2rem;
    background: var(--accent-color);
    color: var(--secondary-color);
    border: none;
    border-radius: 4px;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 77, 0, 0.3);
}

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

.submit-btn.loading {
    pointer-events: none;
    opacity: 0.8;
}

.submit-btn.loading:after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--secondary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 页脚 */
.footer {
    background: var(--primary-color);
    color: var(--secondary-color);
    padding: 5rem 0 2rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand img {
    height: 50px;
    margin-bottom: 1.5rem;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.1rem;
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 3rem;
}

.link-column h4 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
    position: relative;
    padding-bottom: 0.8rem;
}

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

.link-column ul {
    list-style: none;
}

.link-column a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    display: block;
    margin-bottom: 0.8rem;
    transition: var(--transition);
    font-size: 1rem;
}

.link-column a:hover {
    color: var(--accent-color);
    transform: translateX(5px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--accent-color);
    color: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(255, 77, 0, 0.3);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }

    .nav-container {
        height: 70px;
    }

    .nav-header {
        gap: 30px;
    }

    .nav-links {
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .top-bar {
        padding: 8px 0;
    }

    .top-bar .container {
        flex-direction: column;
        gap: 10px;
    }

    .top-bar .contact-info {
        flex-direction: column;
        gap: 10px;
        width: 100%;
        text-align: center;
    }

    .top-bar .social-links {
        justify-content: center;
        width: 100%;
        margin-left: 0;
    }

    .fullscreen-nav {
        top: 100px;
    }

    .nav-container {
        height: 60px;
        padding: 0 15px;
    }

    .nav-header {
        gap: 20px;
    }

    .nav-links {
        display: none;
    }

    .nav-actions {
        gap: 15px;
    }

    .nav-search,
    .nav-cart {
        font-size: 18px;
    }

    .hero {
        margin-top: 150px;
    }

    .hero-text h1 {
        font-size: 2.5rem;
        padding: 0 1rem;
    }

    .hero-text p {
        font-size: 1.1rem;
        padding: 0 1rem;
    }

    .hero-actions {
        flex-direction: column;
        gap: 1rem;
        padding: 0 1rem;
    }

    .action-btn {
        width: 100%;
        text-align: center;
    }

    .products-grid,
    .solutions-slider {
        grid-template-columns: 1fr;
    }

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

    .company-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .top-bar {
        padding: 6px 0;
    }

    .top-bar .container {
        gap: 8px;
    }

    .top-bar .contact-item {
        font-size: 12px;
    }

    .top-bar .social-links {
        gap: 15px;
    }

    .fullscreen-nav {
        top: 80px;
    }

    .hero {
        margin-top: 120px;
    }

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

    .hero-text p {
        font-size: 1rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .products-grid,
    .solutions-slider {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .product-card,
    .solution-slide {
        margin: 0 1rem;
    }

    .product-media,
    .solution-image {
        height: 200px;
    }

    .product-details,
    .solution-content {
        padding: 1.5rem;
    }

    .company-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-content {
        gap: 2rem;
    }

    .nav-container {
        height: 50px;
    }

    .logo img {
        height: 25px;
    }

    .nav-actions {
        gap: 10px;
    }

    .nav-search,
    .nav-cart {
        font-size: 16px;
    }
}