:root {
    --primary-color: #4ECDC4; /* 天青色 */
    --secondary-color: #5AB9EA; /* 天蓝色 */
    --accent-color: #8860D0; /* 淡紫色作为点缀 */
    --light-color: #F7F9FB; /* 浅灰白色 */
    --dark-color: #2D3E50; /* 深蓝灰色 */
    --primary-gradient: linear-gradient(135deg, #4ECDC4 0%, #5AB9EA 100%);
    --secondary-gradient: linear-gradient(135deg, #5AB9EA 0%, #8860D0 100%);
    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-border: rgba(255, 255, 255, 0.25);
    --text-color: #333;
    --text-light: #F7F9FB;
    --text-muted: #6c757d;
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

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

body {
    background: var(--primary-gradient);
    background-attachment: fixed;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

section {
    padding: 80px 0;
}

/* 玻璃态效果 */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

/* 为不支持backdrop-filter的浏览器提供回退方案 */
.no-backdrop-filter .glass,
.no-backdrop-filter .glass-card,
.no-backdrop-filter .navbar {
    background: rgba(255, 255, 255, 0.85);
}

.glass-card {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 16px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    padding: 25px;
    height: 100%;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

/* 导航栏 */
.navbar {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 15px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.25);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-light);
    text-decoration: none;
}

.nav-link {
    color: var(--text-light) !important;
    margin: 0 15px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: var(--accent-color) !important;
    transform: translateY(-2px);
}

/* 英雄部分 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
}

/* 浮动效果 */
.floating {
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-15px);
    }
    100% {
        transform: translateY(0px);
    }
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2.5rem;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
}

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.btn-outline {
    background: transparent;
    color: var(--text-light);
    border: 2px solid var(--text-light);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* 关于我们部分 */
.about-section {
    background: var(--light-color);
    position: relative;
    overflow: hidden;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--dark-color);
    text-align: center;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    text-align: center;
}

.feature-box {
    text-align: center;
    margin-bottom: 30px;
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.feature-desc {
    color: var(--text-muted);
}

/* 服务部分 */
.services-section {
    background: white;
    position: relative;
}

.service-card {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
    margin-bottom: 30px;
}

.service-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.service-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.service-features {
    margin: 1.5rem 0;
}

.service-features li {
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}

/* 项目部分 */
.projects-section {
    background: var(--light-color);
    position: relative;
}

.project-item {
    position: relative;
    overflow: hidden;
    border-radius: 16px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
}

.project-img {
    width: 100%;
    height: auto;
    transition: transform 0.5s ease;
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, rgba(78, 205, 196, 0.8), rgba(90, 185, 234, 0.8));
    opacity: 0;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 20px;
    text-align: center;
}

.project-item:hover .project-overlay {
    opacity: 1;
}

.project-item:hover .project-img {
    transform: scale(1.05);
}

.project-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: white;
    margin-bottom: 0.5rem;
}

.project-desc {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.project-tag {
    background: rgba(255, 255, 255, 0.3);
    color: white;
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    margin: 0 5px 5px 0;
}

/* 联系我们部分 */
.contact-section {
    background: white;
    position: relative;
}

.contact-form {
    background: var(--light-color);
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow);
}

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

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(78, 205, 196, 0.2);
    outline: none;
}

.contact-info {
    margin-top: 30px;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.contact-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-right: 15px;
}

/* 页脚 */
.footer {
    background: var(--dark-color);
    color: var(--text-light);
    padding: 60px 0 30px;
}

.footer-logo {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 30px;
}

.footer-links h5 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: white;
}

.footer-links ul {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    margin-top: 20px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 10px;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 60px;
    color: rgba(255, 255, 255, 0.7);
}

/* 回到顶部按钮 */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

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

.scroll-to-top:hover {
    background: var(--secondary-color);
    transform: translateY(-3px);
}

/* 动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.8s ease;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.8s ease;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* IE浏览器警告 */
.ie-warning {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 9999;
    display: none;
    justify-content: center;
    align-items: center;
}

.ie-warning-content {
    background: white;
    border-radius: 16px;
    padding: 30px;
    max-width: 600px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

/* 语言选择器 */
.language-selector {
    position: relative;
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    padding: 10px 0;
    min-width: 150px;
    z-index: 1000;
    display: none;
}

.language-dropdown.show {
    display: block;
}

.language-item {
    display: flex;
    align-items: center;
    padding: 8px 15px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.language-item:hover {
    background: rgba(78, 205, 196, 0.1);
}

.language-flag {
    width: 20px;
    height: 15px;
    margin-right: 10px;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .service-card {
        margin-bottom: 30px;
    }
    
    .project-card {
        margin-bottom: 30px;
    }
    
    .contact-info {
        margin-bottom: 40px;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    section {
        padding: 60px 0;
    }
    
    .navbar-collapse {
        background: rgba(255, 255, 255, 0.95);
        border-radius: 10px;
        padding: 15px;
        margin-top: 15px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }
    
    .nav-link {
        color: var(--dark-color) !important;
        margin: 8px 0;
        padding: 8px 15px;
    }
    
    .glass-card {
        padding: 20px;
    }
    
    .service-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .project-overlay {
        padding: 15px;
    }
    
    .project-title {
        font-size: 1.2rem;
    }
    
    .contact-form {
        padding: 25px;
    }
    
    .footer {
        padding: 40px 0 20px;
    }
    
    .footer-links {
        margin-bottom: 30px;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
        margin-bottom: 2rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
        display: block;
        width: 100%;
        margin-bottom: 15px;
    }
    
    .btn + .btn {
        margin-left: 0;
    }
    
    section {
        padding: 50px 0;
    }
    
    .scroll-to-top {
        width: 40px;
        height: 40px;
        bottom: 20px;
        right: 20px;
    }
    
    .glass-card {
        padding: 15px;
    }
    
    .service-icon {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
        margin-bottom: 15px;
    }
    
    .service-title {
        font-size: 1.2rem;
        margin-bottom: 10px;
    }
    
    .project-overlay {
        padding: 10px;
    }
    
    .project-title {
        font-size: 1.1rem;
        margin-bottom: 5px;
    }
    
    .project-category {
        font-size: 0.8rem;
    }
    
    .contact-form {
        padding: 20px;
    }
    
    .form-control {
        padding: 10px 15px;
        font-size: 0.9rem;
    }
    
    .navbar-brand {
        font-size: 1.2rem;
    }
    
    .hero-buttons {
        display: flex;
        flex-direction: column;
    }
}