/* 全局CSS变量 */
:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --dark-bg: #0f172a;
    --dark-card: #1e293b;
    --dark-text: #f8fafc;
    --dark-text-secondary: #cbd5e1;
    --light-bg: #f8fafc;
    --light-card: #ffffff;
    --light-text: #0f172a;
    --light-text-secondary: #64748b;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 16px;
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 40px 50px -16px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--light-text);
    background-color: var(--light-bg);
    transition: var(--transition);
    overflow-x: hidden;
}

/* 深色主题 */
body.dark-theme {
    color: var(--dark-text);
    background-color: var(--dark-bg);
}

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

/* 导航栏样式 */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    padding: 1rem 0;
}

body.dark-theme header {
    background: rgba(15, 23, 42, 0.8);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

header.scrolled {
    padding: 0.75rem 0;
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

body.dark-theme header.scrolled {
    background: rgba(15, 23, 42, 0.95);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

/* 品牌标志 */
.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    box-shadow: var(--shadow-lg);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: var(--shadow-lg);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 25px 35px -5px rgba(102, 126, 234, 0.4);
    }
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
    letter-spacing: -0.5px;
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--light-text);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    padding: 0.5rem 0;
    transition: var(--transition);
}

body.dark-theme .nav-menu a {
    color: var(--dark-text);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background: var(--primary-gradient);
    transition: width 0.3s ease;
    border-radius: 1px;
}

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

/* 主题切换按钮 */
.theme-toggle {
    background: transparent;
    border: none;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.1);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(180deg);
}

/* 英雄区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--primary-gradient);
    overflow: hidden;
    padding: 6rem 1rem;
}

/* 背景动画 */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    animation: backgroundMove 20s ease-in-out infinite;
}

@keyframes backgroundMove {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-30px, 30px) scale(0.9);
    }
}

/* 网格线效果 */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 10s linear infinite;
}

@keyframes gridMove {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(50px, 50px);
    }
}

/* 英雄内容 */
.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    color: white;
    margin-bottom: 2rem;
    animation: slideUp 0.8s ease-out;
}

.hero h1 {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 900;
    color: white;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    animation: slideUp 0.8s ease-out 0.2s both;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 3vw, 1.5rem);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 3rem;
    animation: slideUp 0.8s ease-out 0.4s both;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.8s ease-out 0.6s both;
}

.btn-primary {
    background: var(--secondary-gradient);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(245, 87, 108, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-left: 1rem;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

/* 按钮动画 */
.btn::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:hover::before {
    left: 100%;
}

/* 特性区域 */
.features {
    padding: 8rem 0;
    background: var(--light-bg);
}

body.dark-theme .features {
    background: var(--dark-bg);
}

/* 内容区域 */
.content-section {
    padding: 8rem 0;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

body.dark-theme .content-section {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

/* 章节标题 */
.section-header {
    text-align: center;
    margin-bottom: 5rem;
}

.section-badge {
    display: inline-block;
    background: var(--primary-gradient);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--light-text);
    margin-bottom: 1rem;
}

body.dark-theme .section-title {
    color: var(--dark-text);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--light-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

body.dark-theme .section-subtitle {
    color: var(--dark-text-secondary);
}

/* 特性网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin-top: 4rem;
}

.feature-card {
    background: var(--light-card);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

body.dark-theme .feature-card {
    background: var(--dark-card);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-md);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--light-text);
    margin-bottom: 1rem;
}

body.dark-theme .feature-card h3 {
    color: var(--dark-text);
}

.feature-card p {
    color: var(--light-text-secondary);
    line-height: 1.7;
}

body.dark-theme .feature-card p {
    color: var(--dark-text-secondary);
}

/* 内容卡片 */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
    margin-top: 4rem;
}

.content-card {
    background: var(--light-card);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
}

body.dark-theme .content-card {
    background: var(--dark-card);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

.content-card:hover {
    transform: translateY(-10px) rotate(1deg);
    box-shadow: var(--shadow-xl);
}

.content-image {
    width: 100%;
    height: 250px;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: white;
    position: relative;
    overflow: hidden;
}

.content-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: pulse 3s ease-in-out infinite;
}

.content-card-content {
    padding: 2rem;
}

.content-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--light-text);
    margin-bottom: 1rem;
}

body.dark-theme .content-card h3 {
    color: var(--dark-text);
}

.content-card p {
    color: var(--light-text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

body.dark-theme .content-card p {
    color: var(--dark-text-secondary);
}

.content-card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #667eea;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

body.dark-theme .content-card-link {
    color: #818cf8;
}

.content-card-link:hover {
    gap: 0.75rem;
}

/* 页面内容样式 */
.page-section {
    padding: 8rem 0;
    background: var(--light-bg);
}

body.dark-theme .page-section {
    background: var(--dark-bg);
}

.page-content {
    background: var(--light-card);
    padding: 4rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    max-width: 1000px;
    margin: 0 auto;
}

body.dark-theme .page-content {
    background: var(--dark-card);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

.page-content h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--light-text);
    margin-bottom: 2rem;
    text-align: center;
}

body.dark-theme .page-content h2 {
    color: var(--dark-text);
}

.page-content p {
    color: var(--light-text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
    font-size: 1.125rem;
}

body.dark-theme .page-content p {
    color: var(--dark-text-secondary);
}

.page-content h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--light-text);
    margin: 3rem 0 1.5rem;
}

body.dark-theme .page-content h3 {
    color: var(--dark-text);
}

.page-content ul {
    margin-left: 1.5rem;
    margin-bottom: 2rem;
}

.page-content ul li {
    color: var(--light-text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

body.dark-theme .page-content ul li {
    color: var(--dark-text-secondary);
}

/* 新闻网格 */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
    margin-top: 4rem;
}

.news-card {
    background: var(--light-card);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

body.dark-theme .news-card {
    background: var(--dark-card);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

.news-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.news-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--light-text);
    margin-bottom: 1rem;
    line-height: 1.4;
}

body.dark-theme .news-card h3 {
    color: var(--dark-text);
}

.news-card h3 a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

.news-card h3 a:hover {
    color: #667eea;
}

body.dark-theme .news-card h3 a:hover {
    color: #818cf8;
}

.news-card p {
    color: var(--light-text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

body.dark-theme .news-card p {
    color: var(--dark-text-secondary);
}

.news-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    color: var(--light-text-secondary);
    font-size: 0.875rem;
}

body.dark-theme .news-meta {
    color: var(--dark-text-secondary);
}

.news-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 联系表单样式 */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
    margin-top: 3rem;
}

.form-group {
    margin-bottom: 2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--light-text);
    font-size: 0.95rem;
}

body.dark-theme .form-group label {
    color: var(--dark-text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--light-bg);
    color: var(--light-text);
}

body.dark-theme .form-group input,
body.dark-theme .form-group textarea {
    background: var(--dark-bg);
    color: var(--dark-text);
    border-color: rgba(255, 255, 255, 0.1);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

body.dark-theme .form-group input:focus,
body.dark-theme .form-group textarea:focus {
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 200px;
}

.submit-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    box-shadow: var(--shadow-lg);
}

.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.4);
}

/* 服务卡片 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin-top: 4rem;
}

.service-card {
    background: var(--light-card);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    text-align: center;
}

body.dark-theme .service-card {
    background: var(--dark-card);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

.service-card:hover {
    transform: translateY(-10px) rotate(1deg);
    box-shadow: var(--shadow-xl);
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transition: var(--transition);
}

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

.service-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.service-card:hover .service-icon {
    transform: scale(1.1);
}

.service-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--light-text);
    margin-bottom: 1rem;
}

body.dark-theme .service-card h3 {
    color: var(--dark-text);
}

.service-card p {
    color: var(--light-text-secondary);
    line-height: 1.7;
}

body.dark-theme .service-card p {
    color: var(--dark-text-secondary);
}

/* 页脚 */
footer {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: white;
    padding: 5rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-info h4 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-info p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1.5rem;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: white;
}

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

.footer-links ul li {
    margin-bottom: 1rem;
}

.footer-links ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-links ul li a:hover {
    color: #818cf8;
    gap: 0.75rem;
}

.footer-contact p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

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

body.dark-theme .loader {
    background: var(--dark-bg);
}

.loader.hidden {
    opacity: 0;
    pointer-events: none;
}

.loader-inner {
    width: 60px;
    height: 60px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

body.dark-theme .loader-inner {
    border-color: rgba(255, 255, 255, 0.1);
    border-top-color: #667eea;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero {
        padding: 6rem 1rem;
    }
    
    .hero-buttons {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .btn-secondary {
        margin-left: 0;
    }
    
    .features,
    .content-section,
    .page-section {
        padding: 5rem 1rem;
    }
    
    .features-grid,
    .content-grid,
    .news-grid,
    .services-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .page-content {
        padding: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

/* 图片优化 */
img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

img:hover {
    transform: scale(1.02);
}

/* 滚动动画 */
.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}