/* CSS变量定义 */
:root {
    --primary: #667eea;
    --primary-dark: #5a6bcb;
    --secondary: #764ba2;
    --accent: #ff6b6b;
    --success: #38b2ac;
    --dark: #1a1a2e;
    --darker: #0f0f1a;
    --light: #ffffff;
    --lighter: #fafafa;
    --gray: #f5f7fa;
    --gray-dark: #e2e8f0;
    --text: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #a0aec0;
    --shadow: 0 10px 30px -15px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.08);
    --border-radius: 24px;
    --border-radius-sm: 12px;
    --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --transition-fast: all 0.2s ease;
    --spacing: 1.5rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4.5rem;
}

/* 暗色主题变量 */
[data-theme="dark"] {
    --primary: #7c93fb;
    --primary-dark: #6a7fd9;
    --secondary: #8a5fb5;
    --accent: #ff7b7b;
    --dark: #0a0a15;
    --light: #1e1e2e;
    --lighter: #2d2d44;
    --gray: #252535;
    --gray-dark: #3a3a4a;
    --text: #e2e8f0;
    --text-secondary: #a0aec0;
    --text-light: #718096;
    --shadow: 0 10px 30px -15px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.6);
}

/* 重置和基本样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--gray);
    overflow-x: hidden;
    position: relative;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* 背景装饰 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 10% 20%, rgba(102, 126, 234, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(118, 75, 162, 0.05) 0%, transparent 40%);
    z-index: -2;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.8) 100%);
    z-index: -1;
}

[data-theme="dark"] body::after {
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.95) 0%, rgba(15, 15, 26, 0.9) 100%);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing);
}

/* 加载器 */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--light);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader-content {
    text-align: center;
}

.loader-content i {
    font-size: 4rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.loader-text {
    font-family: 'Playfair Display', serif;
    font-size: 2rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 2rem;
}

.loader-bar {
    width: 200px;
    height: 6px;
    background: var(--gray-dark);
    border-radius: 3px;
    overflow: hidden;
}

.loader-progress {
    height: 100%;
    width: 0%;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    border-radius: 3px;
    animation: loading 2s ease-in-out forwards;
}

@keyframes loading {
    0% { width: 0%; }
    100% { width: 100%; }
}

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

/* 导航栏 */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1.2rem 0;
    z-index: 1000;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

[data-theme="dark"] nav {
    background: rgba(30, 30, 46, 0.95);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: 'Playfair Display', serif;
    font-weight: 800;
    font-size: 1.8rem;
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.logo i {
    font-size: 2.2rem;
    color: var(--secondary);
}

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

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text);
    cursor: pointer;
    padding: 0.5rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    position: relative;
    padding: 0.5rem 0;
    transition: var(--transition);
    letter-spacing: 0.5px;
}

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

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

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

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gray);
    color: var(--text);
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--primary);
    color: white;
}

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

.hero-content {
    max-width: 850px;
    text-align: center;
    margin: 0 auto;
    padding: 0 var(--spacing);
    position: relative;
    z-index: 2;
}

.hero-title {
    font-family: 'Playfair Display', serif;
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.9;
}

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

.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    padding: 1.2rem 3rem;
    border: none;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.5px;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(to right, var(--primary), var(--secondary));
    color: white;
    box-shadow: var(--shadow);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition);
}

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

.btn-primary:hover::before {
    left: 100%;
}

.btn-secondary {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.hero-image {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 50%;
    height: 100%;
    z-index: 1;
}

.floating-element {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    opacity: 0.1;
}

#floating1 {
    width: 300px;
    height: 300px;
    top: 10%;
    right: 5%;
    animation: float 20s ease-in-out infinite;
}

#floating2 {
    width: 200px;
    height: 200px;
    top: 50%;
    right: 15%;
    animation: float 25s ease-in-out infinite reverse;
}

#floating3 {
    width: 150px;
    height: 150px;
    bottom: 20%;
    right: 25%;
    animation: float 30s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-40px) rotate(180deg); }
}

/* 统计数据 */
.stats {
    padding: var(--spacing-xl) 0;
    background: var(--light);
    margin: var(--spacing-xl) 0;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.stat-item {
    text-align: center;
    padding: var(--spacing);
}

.stat-number {
    font-family: 'Playfair Display', serif;
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* 标题样式 */
.section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    text-align: center;
    font-family: 'Playfair Display', serif;
    font-size: 3.2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    color: var(--text);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    border-radius: 2px;
}

/* 服务卡片 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.service-card {
    background: var(--light);
    border-radius: var(--border-radius);
    padding: 3rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    height: 100%;
}

[data-theme="dark"] .service-card {
    border-color: rgba(255, 255, 255, 0.05);
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
}

.service-card:hover {
    transform: translateY(-15px);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary);
    text-align: center;
}

.service-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--text);
    font-weight: 700;
}

.service-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 2rem;
    flex-grow: 1;
}

.service-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.service-link:hover {
    gap: 1rem;
}

/* 公司介绍 */
.company-intro {
    background: var(--light);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow);
    margin-bottom: var(--spacing-xl);
    position: relative;
    overflow: hidden;
}

.company-intro::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
}

.intro-text {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text);
    text-align: justify;
    margin-bottom: 2rem;
}

/* 技术栈 */
.tech-stack {
    padding: var(--spacing-xl) 0;
    background: var(--light);
    border-radius: var(--border-radius);
    margin: var(--spacing-xl) 0;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing);
    margin-top: var(--spacing-xl);
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem 1rem;
    background: var(--lighter);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.tech-item:hover {
    transform: translateY(-10px);
    background: var(--primary);
    color: white;
}

.tech-item i {
    font-size: 3rem;
}

.tech-item span {
    font-weight: 600;
    font-size: 1.2rem;
}

/* 联系信息 */
.contact-info {
    background: var(--light);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow);
    margin-bottom: var(--spacing-xl);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    border-radius: 16px;
    background: rgba(102, 126, 234, 0.05);
    transition: var(--transition);
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.contact-item:hover {
    background: rgba(102, 126, 234, 0.1);
    transform: translateX(8px);
    border-color: rgba(102, 126, 234, 0.2);
}

.contact-icon {
    font-size: 2.2rem;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
    color: white;
    border-radius: 16px;
    flex-shrink: 0;
}

.contact-label {
    font-weight: 600;
    color: var(--text);
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.contact-value {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.contact-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 99;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

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

/* 底部 */
footer {
    background: var(--dark);
    color: var(--light);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    position: relative;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing);
}

.footer-logo {
    font-family: 'Playfair Display', serif;
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--light);
    margin-bottom: var(--spacing);
}

.footer-text {
    max-width: 600px;
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

.footer-links {
    display: flex;
    gap: var(--spacing);
    margin-top: var(--spacing);
    flex-wrap: wrap;
    justify-content: center;
}

.footer-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
}

.footer-link:hover {
    color: var(--primary);
    text-decoration: underline;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    margin-top: var(--spacing);
}

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

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

.copyright {
    margin-top: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    text-align: center;
}

.icp-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: var(--spacing);
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.icp-link {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.2rem;
}

.icp-link:hover {
    color: var(--secondary);
    text-decoration: underline;
}

/* 动画效果 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* 响应式设计 */
@media (max-width: 992px) {
    .hero-title {
        font-size: 3.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.3rem;
    }
    
    .hero-image {
        width: 60%;
    }
}

@media (max-width: 768px) {
    .nav-content {
        position: relative;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-links {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background: var(--light);
        flex-direction: column;
        padding: var(--spacing);
        box-shadow: var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
        z-index: 999;
    }
    
    [data-theme="dark"] .nav-links {
        background: var(--dark);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .hero-title {
        font-size: 2.8rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .hero-image {
        display: none;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 2.3rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .btn-primary, .btn-secondary {
        padding: 1rem 2.5rem;
        font-size: 1rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
}