/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c7ad6;
    --secondary-color: #f67e27;
    --accent-color: #27ae60;
    --dark-color: #1a237e;
    --light-color: #f8f9fa;
    --gray-color: #6c757d;
    --light-gray: #e9ecef;
    --text-color: #333;
    --white: #fff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

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

/* 导航栏 */
header {
    background-color: transparent;
    box-shadow: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition);
    padding: 20px 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

header.scrolled {
    background-color: var(--white);
    box-shadow: var(--shadow);
    padding: 15px 0;
}

.logo h1 {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 5px;
    font-weight: 700;
}

.logo p {
    font-size: 14px;
    color: var(--gray-color);
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    text-decoration: none;
    color: var(--white);
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 8px 0;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

header.scrolled nav ul li a {
    color: var(--text-color);
    text-shadow: none;
}

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

nav ul li a:hover {
    color: var(--primary-color);
}

nav ul li a:hover::after {
    width: 100%;
}

.contact-info p {
    font-size: 14px;
    color: var(--white);
    margin-left: 20px;
    display: inline-block;
    transition: var(--transition);
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.contact-info p:hover {
    color: var(--secondary-color);
}

.contact-info i {
    color: var(--white);
    margin-right: 5px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

header.scrolled .contact-info p {
    color: var(--gray-color);
    text-shadow: none;
}

header.scrolled .contact-info p:hover {
    color: var(--primary-color);
}

header.scrolled .contact-info i {
    color: var(--primary-color);
    text-shadow: none;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, var(--dark-color), var(--primary-color));
    color: var(--white);
    padding: 150px 0 100px;
    text-align: center;
    margin-top: 80px;
    position: relative;
    overflow: hidden;
    background-image: url('https://images.unsplash.com/photo-1551434678-e076c223a692?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-blend-mode: overlay;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 35, 126, 0.9), rgba(44, 122, 214, 0.8));
    z-index: 1;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.1)" d="M0,96L48,117.3C96,139,192,181,288,186.7C384,192,480,160,576,138.7C672,117,768,107,864,122.7C960,139,1056,181,1152,181.3C1248,181,1344,139,1392,117.3L1440,96L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
    background-size: cover;
    background-position: center;
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
}

.hero-content h2 {
    font-size: 48px;
    margin-bottom: 20px;
    animation: fadeInUp 1s ease;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-content p {
    font-size: 20px;
    margin-bottom: 40px;
    animation: fadeInUp 1s ease 0.2s both;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 15px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 18px;
    font-weight: 600;
    transition: var(--transition);
    animation: fadeInUp 1s ease 0.4s both;
    box-shadow: 0 4px 15px rgba(246, 126, 39, 0.3);
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #e56e1f;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(246, 126, 39, 0.4);
}

/* 服务项目 */
.services {
    padding: 100px 0;
    background-color: var(--white);
    position: relative;
}

.services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: linear-gradient(to bottom, var(--light-color), var(--white));
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 20px;
    color: var(--dark-color);
    position: relative;
    font-weight: 700;
}

.section-subtitle {
    text-align: center;
    font-size: 18px;
    color: var(--gray-color);
    margin-bottom: 60px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-title::after {
    content: '';
    display: block;
    width: 100px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 20px auto;
    border-radius: 3px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-item {
    background-color: var(--white);
    padding: 45px 30px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow);
    border: 1px solid var(--light-gray);
    position: relative;
    overflow: hidden;
}

.service-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: var(--transition);
}

.service-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.service-item:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 36px;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(44, 122, 214, 0.3);
    position: relative;
    overflow: hidden;
}

.service-icon::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transform: rotate(45deg);
    animation: shine 3s infinite;
}

@keyframes shine {
    0% {
        transform: translateX(-100%) rotate(45deg);
    }
    100% {
        transform: translateX(100%) rotate(45deg);
    }
}

.service-item:hover .service-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 6px 20px rgba(44, 122, 214, 0.4);
}

.service-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--dark-color);
    font-weight: 600;
}

.service-item p {
    color: var(--gray-color);
    line-height: 1.6;
    font-size: 15px;
}

/* 我们的优势 */
.advantages {
    padding: 100px 0;
    background-color: var(--light-color);
    position: relative;
}

.advantages::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: linear-gradient(to bottom, var(--white), var(--light-color));
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.advantage-item {
    background-color: var(--white);
    padding: 45px 30px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow);
    border: 1px solid var(--light-gray);
    position: relative;
}

.advantage-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.advantage-icon {
    width: 90px;
    height: 90px;
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 32px;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(39, 174, 96, 0.3);
    position: relative;
}

.advantage-icon::before {
    content: '';
    position: absolute;
    top: 5px;
    left: 5px;
    right: 5px;
    bottom: 5px;
    border: 2px dashed rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    transition: var(--transition);
}

.advantage-item:hover .advantage-icon {
    transform: scale(1.1) rotate(-5deg);
    box-shadow: 0 6px 20px rgba(39, 174, 96, 0.4);
}

.advantage-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--dark-color);
    font-weight: 600;
}

.advantage-item p {
    color: var(--gray-color);
    line-height: 1.6;
    font-size: 15px;
}

/* 成功案例 */
.cases {
    padding: 100px 0;
    background-color: var(--white);
    position: relative;
}

.cases::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: linear-gradient(to bottom, var(--light-color), var(--white));
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.case-item {
    background-color: var(--white);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow);
    border: 1px solid var(--light-gray);
    position: relative;
}

.case-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.case-image {
    position: relative;
    overflow: hidden;
    height: 250px;
    border-radius: 12px 12px 0 0;
}

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

.case-item:hover .case-image img {
    transform: scale(1.1);
}

.case-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.3));
    opacity: 0;
    transition: var(--transition);
}

.case-item:hover .case-image::before {
    opacity: 1;
}

.case-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(44, 122, 214, 0.2), transparent);
    transform: translateX(-100%);
    transition: var(--transition);
}

.case-item:hover .case-image::after {
    transform: translateX(100%);
    transition: transform 1s ease;
}

.case-content {
    padding: 30px;
}

.case-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--dark-color);
    font-weight: 600;
    position: relative;
    padding-bottom: 10px;
}

.case-item h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
}

.case-item p {
    color: var(--gray-color);
    line-height: 1.6;
    font-size: 15px;
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    background-color: var(--light-color);
    position: relative;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: linear-gradient(to bottom, var(--white), var(--light-color));
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}

.contact-form {
    background-color: var(--white);
    padding: 45px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--light-gray);
    position: relative;
    overflow: hidden;
}

.contact-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

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

.form-group label {
    display: block;
    margin-top: 8px;
    color: var(--dark-color);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: var(--transition);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid var(--light-gray);
    border-radius: 8px;
    font-size: 16px;
    transition: var(--transition);
    background-color: var(--light-color);
    position: relative;
    z-index: 1;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: var(--white);
    box-shadow: 0 0 0 3px rgba(44, 122, 214, 0.1);
    transform: translateY(-2px);
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--dark-color);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: var(--transition);
}

.form-group input:focus + label,
.form-group textarea:focus + label {
    color: var(--primary-color);
    transform: translateY(-5px);
}

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

.contact-info {
    background: linear-gradient(135deg, var(--dark-color), var(--primary-color));
    color: var(--white);
    padding: 45px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.contact-info::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.05)" d="M0,224L48,213.3C96,203,192,181,288,181.3C384,181,480,203,576,218.7C672,235,768,245,864,234.7C960,224,1056,192,1152,181.3C1248,171,1344,181,1392,186.7L1440,192L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
    background-size: cover;
    background-position: center;
}

.contact-info-content {
    position: relative;
    z-index: 1;
}

.contact-info h3 {
    font-size: 24px;
    margin-bottom: 30px;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.contact-info-content p {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    font-size: 16px;
    opacity: 1;
    color: var(--white);
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.contact-info-content i {
    margin-right: 15px;
    font-size: 20px;
    color: var(--white);
    width: 30px;
    text-align: center;
    opacity: 0.9;
}

.social-icons {
    margin-top: 30px;
}

.social-icons a {
    display: inline-block;
    width: 45px;
    height: 45px;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 10px;
    transition: var(--transition);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.social-icons a:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px) rotate(5deg);
    border-color: var(--secondary-color);
}

/* 页脚 */
footer {
    background-color: var(--dark-color);
    color: var(--white);
    padding: 80px 0 40px;
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.03)" d="M0,160L48,165.3C96,171,192,181,288,181.3C384,181,480,171,576,149.3C672,128,768,96,864,90.7C960,85,1056,107,1152,117.3C1248,128,1344,128,1392,128L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
    background-size: cover;
    background-position: center;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
    position: relative;
    z-index: 1;
}

.footer-logo h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--secondary-color);
    font-weight: 700;
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
    font-size: 14px;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 18px;
    margin-bottom: 25px;
    color: var(--white);
    font-weight: 600;
    position: relative;
    padding-bottom: 10px;
}

.footer-links h4::after,
.footer-contact h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--secondary-color);
    border-radius: 2px;
}

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

.footer-links ul li {
    margin-bottom: 12px;
}

.footer-links ul li a {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
    font-size: 14px;
    display: inline-block;
    position: relative;
    padding-left: 15px;
}

.footer-links ul li a::before {
    content: '→';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--secondary-color);
    transition: var(--transition);
}

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

.footer-contact p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    font-size: 14px;
}

.footer-contact i {
    margin-right: 12px;
    color: var(--secondary-color);
    width: 20px;
    text-align: center;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    position: relative;
    z-index: 1;
}

.footer-bottom p {
    font-size: 14px;
    margin-bottom: 10px;
}

.footer-bottom a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: var(--transition);
}

.footer-bottom a:hover {
    text-decoration: underline;
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: #e63946;
    color: #fff;
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

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

.back-to-top:hover {
    background-color: #c1121f;
    transform: translateY(-5px);
}

/* 加载动画 */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid #e63946;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        padding: 10px;
    }

    nav ul {
        margin: 10px 0;
    }

    nav ul li {
        margin-left: 15px;
        margin-right: 15px;
    }

    .contact-info p {
        margin-left: 0;
        margin-right: 10px;
    }

    .hero-content h2 {
        font-size: 36px;
    }

    .hero-content p {
        font-size: 18px;
    }

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

    .services-grid,
    .advantages-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 30px;
    }

    .back-to-top {
        width: 40px;
        height: 40px;
        font-size: 16px;
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 100px 0 80px;
    }

    .hero-content h2 {
        font-size: 28px;
    }

    .service-item,
    .advantage-item {
        padding: 30px;
    }

    .contact-form,
    .contact-info {
        padding: 30px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}