/* 全局样式 */
:root {
    --primary-color: #1e88e5;
    --secondary-color: #283593;
    --accent-color: #00c853;
    --dark-color: #212121;
    --light-color: #f5f5f5;
    --gray-color: #757575;
    --gradient-primary: linear-gradient(135deg, #1e88e5, #283593);
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #fff;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--primary-color);
}

.section-header p {
    font-size: 1.1rem;
    color: var(--gray-color);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 30px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: var(--box-shadow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(30, 136, 229, 0.3);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.btn-outline:hover {
    background: #fff;
    color: var(--primary-color);
    transform: translateY(-3px);
}

/* 导航栏样式 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: transparent;
    padding: 20px 0;
    transition: var(--transition);
}

.header.sticky {
    background-color: #fff;
    box-shadow: var(--box-shadow);
    padding: 15px 0;
}

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

.logo a {
    font-size: 1.8rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 1px;
}

.logo span {
    color: var(--accent-color);
}

.header.sticky .logo a {
    color: var(--dark-color);
}

.nav-menu {
    display: flex;
    align-items: center;
}

.menu {
    display: flex;
}

.menu li {
    margin: 0 15px;
}

.menu li a {
    color: #fff;
    font-weight: 500;
    padding: 8px 0;
    position: relative;
}

.header.sticky .menu li a {
    color: var(--dark-color);
}

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

.menu li a:hover::after,
.menu li a.active::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: #fff;
    margin: 5px 0;
    transition: var(--transition);
}

.header.sticky .menu-toggle span {
    background-color: var(--dark-color);
}

/* 首屏Banner样式 */
.hero {
    height: 100vh;
    background: #A0522D;
    position: relative;
    display: flex;
    align-items: center;
    color: #fff;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero-content {
    max-width: 700px;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content h1 span {
    color: var(--accent-color);
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

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

/* 服务介绍样式 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background-color: #fff;
    border-radius: 10px;
    padding: 40px 30px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    text-align: center;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
}

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

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.service-card p {
    color: var(--gray-color);
    margin-bottom: 20px;
}

.service-features {
    margin: 20px 0;
    text-align: left;
}

.service-features li {
    margin-bottom: 10px;
    position: relative;
    padding-left: 25px;
    color: var(--gray-color);
}

.service-features li::before {
    content: '\f00c';
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    color: var(--accent-color);
    position: absolute;
    left: 0;
}

.btn-service {
    display: inline-block;
    padding: 10px 25px;
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    border-radius: 30px;
    font-weight: 500;
    transition: var(--transition);
}

.btn-service:hover {
    background: var(--gradient-primary);
    color: #fff;
    border-color: transparent;
}

/* 关于我们样式 */
.about {
    background-color: var(--light-color);
}

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

.about-text p {
    color: var(--gray-color);
    margin-bottom: 20px;
}

.about-stats {
    display: flex;
    justify-content: space-between;
    margin-top: 40px;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
    margin-bottom: 5px;
}

.stat-text {
    color: var(--gray-color);
    font-size: 0.9rem;
}

.about-image img {
    border-radius: 10px;
    box-shadow: var(--box-shadow);
}

/* 案例展示样式 */
.portfolio-filter {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 20px;
    margin: 5px;
    background: transparent;
    border: 1px solid var(--gray-color);
    border-radius: 30px;
    color: var(--gray-color);
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--gradient-primary);
    color: #fff;
    border-color: transparent;
}

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

.portfolio-item {
    border-radius: 10px;
    overflow: hidden;
    position: relative;
    box-shadow: var(--box-shadow);
}

.portfolio-img {
    height: 250px;
}

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

.portfolio-info {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 20px;
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(100%);
    transition: var(--transition);
}

.portfolio-item:hover .portfolio-info {
    transform: translateY(0);
}

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

.portfolio-info h3 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.portfolio-info p {
    color: var(--primary-color);
    font-size: 0.9rem;
}

.portfolio-link {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    transition: var(--transition);
}

.portfolio-link:hover {
    background: var(--secondary-color);
    transform: rotate(45deg);
}

/* 联系我们样式 */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

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

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 20px;
    flex-shrink: 0;
}

.contact-icon i {
    font-size: 1.2rem;
    color: #fff;
}

.contact-text h3 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.contact-text p {
    color: var(--gray-color);
}

.social-links {
    display: flex;
    margin-top: 30px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    margin-right: 15px;
    transition: var(--transition);
}

.social-link:hover {
    transform: translateY(-5px);
}

.contact-form form {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(30, 136, 229, 0.2);
}

.form-group textarea {
    height: 150px;
    resize: none;
}

/* 页脚样式 */
.footer {
    background-color: var(--dark-color);
    color: #fff;
    padding: 80px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    margin-bottom: 50px;
}

.footer-logo a {
    font-size: 1.8rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 1px;
}

.footer-logo span {
    color: var(--accent-color);
}

.footer-logo p {
    margin-top: 15px;
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: flex;
    justify-content: space-between;
}

.footer-link-group h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-link-group h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--accent-color);
}

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

.footer-link-group ul li a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-link-group ul li a:hover {
    color: var(--accent-color);
    padding-left: 5px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px 0;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.footer-bottom a {
    color: var(--accent-color);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
}

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

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

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-content h1 {
        font-size: 3rem;
    }
    
    section {
        padding: 80px 0;
    }
}

@media (max-width: 991px) {
    .about-content,
    .contact-wrapper,
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-image {
        order: -1;
    }
    
    .about-stats {
        justify-content: space-around;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        background: #fff;
        flex-direction: column;
        align-items: center;
        padding: 20px 0;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        transition: var(--transition);
    }
    
    .menu.active {
        left: 0;
    }
    
    .menu li {
        margin: 15px 0;
    }
    
    .menu li a {
        color: var(--dark-color);
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .portfolio-filter {
        overflow-x: auto;
        padding-bottom: 10px;
    }
}

@media (max-width: 576px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .service-card {
        padding: 30px 20px;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 30px;
    }
    
    .contact-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .contact-icon {
        margin-bottom: 15px;
    }
}