/* 全局样式 */
:root {
    --primary-color: #1a237e;
    --secondary-color: #0d47a1;
    --accent-color: #b3e5fc;
    --text-color: #333;
    --light-text: #fff;
    --background: #f5f5f5;
    --transition: all 0.3s ease;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --container-width: 1200px;
}

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

body {
    font-family: "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background);
}

/* 容器通用样式 */
.header-container,
.features-container,
.contact-container,
.footer-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    box-shadow: var(--shadow);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(26, 35, 126, 0.95);
    backdrop-filter: blur(10px);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo h1 {
    color: var(--light-text);
    font-size: 2rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

/* 导航样式 */
.main-nav {
    display: flex;
    align-items: center;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links li {
    position: relative;
}

.nav-links a {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 1.1rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--light-text);
    background: rgba(255, 255, 255, 0.1);
}

/* 二级菜单样式 */
.submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--light-text);
    border-radius: 4px;
    box-shadow: var(--shadow);
    min-width: 200px;
    z-index: 1000;
    transform: translateY(10px);
    opacity: 0;
    transition: var(--transition);
}

.nav-links li:hover .submenu {
    display: block;
    transform: translateY(0);
    opacity: 1;
}

.submenu li {
    margin: 0;
}

.submenu a {
    color: var(--text-color);
    padding: 0.8rem 1.5rem;
    display: block;
    font-size: 1rem;
}

.submenu a:hover {
    background: var(--accent-color);
    color: var(--primary-color);
}

/* 轮播图样式 */
.hero {
    height: 100vh;
    position: relative;
    overflow: hidden;
    margin-top: 80px;
}

.carousel {
    height: 100%;
    position: relative;
}

.carousel-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
}

.carousel-item.active {
    opacity: 1;
}

.carousel-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.carousel-caption {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--light-text);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    width: 80%;
    max-width: 800px;
}

.carousel-caption h2 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease 0.2s;
}

.carousel-caption p {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease 0.4s;
}

.carousel-item.active .carousel-caption h2,
.carousel-item.active .carousel-caption p {
    opacity: 1;
    transform: translateY(0);
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: var(--light-text);
    text-decoration: none;
    border-radius: 30px;
    font-size: 1.1rem;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease 0.6s;
}

.carousel-item.active .cta-button {
    opacity: 1;
    transform: translateY(0);
}

.cta-button:hover {
    background: var(--secondary-color);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.carousel-indicators {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1rem;
}

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

.indicator.active {
    background: var(--light-text);
    transform: scale(1.2);
}

/* 特色内容区样式 */
.features-section {
    padding: 6rem 0;
    background: var(--light-text);
}

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

.section-header h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.2rem;
    color: var(--text-color);
    opacity: 0.8;
}

.features-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background: var(--light-text);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}

.card-image {
    position: relative;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: var(--transition);
}

.feature-card:hover .card-image img {
    transform: scale(1.1);
}

.card-content {
    padding: 2rem;
}

.card-content h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.card-content p {
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.feature-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: bold;
    transition: var(--transition);
}

.feature-link:hover {
    color: var(--secondary-color);
    transform: translateX(5px);
}

/* 时间轴样式 */
.timeline-section {
    padding: 6rem 0;
    background: linear-gradient(135deg, #f5f7fa, #e8ecf1);
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: var(--primary-color);
}

.timeline-item {
    margin-bottom: 3rem;
    position: relative;
}

.timeline-content {
    background: var(--light-text);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: var(--shadow);
    width: calc(50% - 3rem);
    position: relative;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-left: auto;
}

.timeline-content::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    top: 50%;
    transform: translateY(-50%);
}

.timeline-item:nth-child(odd) .timeline-content::before {
    left: -40px;
}

.timeline-item:nth-child(even) .timeline-content::before {
    right: -40px;
}

.timeline-content h3 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

/* 联系表单区样式 */
.contact-section {
    padding: 6rem 0;
    background: var(--light-text);
}

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

.contact-info h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.info-items {
    margin-top: 2rem;
}

.info-item {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
}

.info-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-right: 1rem;
}

.contact-form {
    background: var(--light-text);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-weight: bold;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
}

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

.submit-button {
    background: var(--primary-color);
    color: var(--light-text);
    padding: 1rem 2rem;
    border: none;
    border-radius: 30px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
}

.submit-button:hover {
    background: var(--secondary-color);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* 页脚样式 */
.footer {
    background: var(--primary-color);
    color: var(--light-text);
    padding: 4rem 0 2rem;
}

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

.footer-info h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.footer-links h4,
.footer-social h4 {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
}

.footer-links ul {
    list-style: none;
}

.footer-links a {
    color: var(--light-text);
    text-decoration: none;
    display: block;
    margin-bottom: 0.8rem;
    transition: var(--transition);
}

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

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    color: var(--light-text);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 1px solid var(--light-text);
    border-radius: 20px;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--light-text);
    color: var(--primary-color);
}

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

/* 响应式设计 */
@media (max-width: 1200px) {
    .features-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .contact-container {
        grid-template-columns: 1fr;
    }

    .timeline-content {
        width: calc(100% - 3rem);
        margin: 0 !important;
    }

    .timeline::before {
        left: 2rem;
    }

    .timeline-content::before {
        left: -40px !important;
    }
}

@media (max-width: 768px) {
    .features-container {
        grid-template-columns: 1fr;
    }

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

    .carousel-caption h2 {
        font-size: 2.5rem;
    }

    .carousel-caption p {
        font-size: 1.2rem;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fadeInUp {
    animation: fadeInUp 0.8s ease forwards;
}