:root {
    /* 亮色模式变量 */
    --primary-color: #1DA1F2;
    --secondary-color: #0D8ECF;
    --text-primary: #0F1419;
    --text-secondary: #536471;
    --bg-primary: #ffffff;
    --bg-secondary: #F7F9F9;
    --card-bg: rgba(255, 255, 255, 0.9);
    --nav-bg: rgba(255, 255, 255, 0.9);
    --border-color: rgba(0, 0, 0, 0.1);
    --gradient-primary: linear-gradient(135deg, #1DA1F2 0%, #0D8ECF 100%);
    --gradient-secondary: linear-gradient(135deg, rgba(29, 161, 242, 0.1) 0%, rgba(13, 142, 207, 0.1) 100%);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --accent-color: #1DA1F2;
    --accent-hover: #0D8ECF;
}

/* 暗色模式变量 */
[data-theme="dark"] {
    --primary-color: #1DA1F2;
    --secondary-color: #0D8ECF;
    --text-primary: #E7E9EA;
    --text-secondary: #71767B;
    --bg-primary: #000000;
    --bg-secondary: #16181C;
    --card-bg: rgba(22, 24, 28, 0.7);
    --nav-bg: rgba(0, 0, 0, 0.8);
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, sans-serif;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background 0.3s, color 0.3s;
    line-height: 1.6;
}

/* 科技感元素 */
.tech-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(29, 161, 242, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(29, 161, 242, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

nav {
    background: var(--nav-bg);
    padding: 1.5rem 5%;
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0, 230, 118, 0.1);
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-right: 4rem;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    margin-right: auto;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: all 0.3s;
    font-size: 0.95rem;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

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

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.language-selector {
    margin-left: 0;
}

.language-dropdown {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.language-dropdown:hover {
    border-color: var(--primary-color);
}

/* 页面内容样式 */
.page-content {
    position: relative;
    z-index: 1;
    padding: 120px 5% 6rem;
    min-height: 100vh;
}

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

h1 {
    font-size: 3rem;
    margin-bottom: 3rem;
    text-align: center;
    background: linear-gradient(90deg, #fff, var(--primary-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* 产品和服务页面样式 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.product-card {
    padding: 3rem 2.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    text-align: left;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px var(--shadow-color);
}

.product-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--primary-color);
    box-shadow: 
        0 20px 40px var(--shadow-color),
        0 0 0 1px var(--primary-color),
        0 0 20px rgba(0, 230, 118, 0.2);
}

.product-card h3 {
    color: var(--text-primary);
    margin: 1.5rem 0;
    font-size: 1.8rem;
    font-weight: 600;
    position: relative;
    padding-left: 1rem;
    transition: transform 0.3s ease;
}

.product-card:hover h3 {
    transform: translateX(8px);
}

.product-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1.1rem;
    transition: color 0.3s ease;
}

.product-card:hover p {
    color: var(--text-primary);
}

.product-card ul {
    list-style: none;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.product-card:hover ul {
    color: var(--text-primary);
}

.product-card li {
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
    transition: transform 0.3s ease;
}

.product-card:hover li {
    transform: translateX(4px);
}

.product-card li::before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
    transition: transform 0.3s ease;
}

.product-card:hover li::before {
    transform: scale(1.5);
}

/* 解决方案页面样式 */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.solution-card {
    padding: 3rem 2.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    text-align: left;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px var(--shadow-color);
    display: flex;
    flex-direction: column;
}

.solution-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--primary-color);
    box-shadow: 
        0 20px 40px var(--shadow-color),
        0 0 0 1px var(--primary-color),
        0 0 20px rgba(0, 230, 118, 0.2);
}

.solution-card h3 {
    color: var(--text-primary);
    margin: 1.5rem 0;
    font-size: 1.8rem;
    font-weight: 600;
    position: relative;
    padding-left: 1rem;
    transition: transform 0.3s ease;
    height: 3.6rem;
    display: flex;
    align-items: center;
}

.solution-card:hover h3 {
    transform: translateX(8px);
}

.solution-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1.1rem;
    transition: color 0.3s ease;
    height: 5.4rem;
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
}

.solution-card:hover p {
    color: var(--text-primary);
}

.solution-card ul {
    list-style: none;
    color: var(--text-secondary);
    transition: color 0.3s ease;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.solution-card:hover ul {
    color: var(--text-primary);
}

.solution-card li {
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
    transition: transform 0.3s ease;
    height: 2rem;
    display: flex;
    align-items: center;
}

.solution-card:hover li {
    transform: translateX(4px);
}

.solution-card li::before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
    transition: transform 0.3s ease;
}

.solution-card:hover li::before {
    transform: scale(1.5);
}

/* 卡片背景光效 */
.product-card::after,
.solution-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(
        circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
        rgba(0, 230, 118, 0.1) 0%,
        transparent 50%
    );
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.product-card:hover::after,
.solution-card:hover::after {
    opacity: 1;
}

/* 联系我们页面样式 */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 2rem;
}

.contact-info {
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.info-item {
    margin-bottom: 2rem;
}

.info-item h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.info-item p {
    color: var(--text-secondary);
}

.contact-form {
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn {
    padding: 1rem 2.5rem;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.3s;
    cursor: pointer;
    display: inline-block;
    box-shadow: 0 4px 15px rgba(29, 161, 242, 0.2);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(29, 161, 242, 0.3);
    background: var(--gradient-primary);
}

/* 页脚样式 */
footer {
    padding: 3rem 5%;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    h1 {
        font-size: 2.5rem;
    }
}

/* 首页样式优化 */
.hero {
    text-align: center;
    padding: 8rem 0 6rem;
    position: relative;
    overflow: hidden;
    background: var(--gradient-secondary);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(0, 230, 118, 0.1) 0%, transparent 70%);
    z-index: -1;
}

.hero h1 {
    font-size: 4.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.hero p {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.hero .btn {
    padding: 1.2rem 3rem;
    font-size: 1.1rem;
    background: var(--gradient-primary);
    border-radius: 50px;
    box-shadow: 0 10px 20px rgba(0, 230, 118, 0.2);
    transition: all 0.3s ease;
}

.hero .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0, 230, 118, 0.3);
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
    margin-top: 6rem;
    padding: 0 2rem;
}

.feature-card {
    padding: 3rem 2.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    text-align: left;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: visible;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px var(--shadow-color);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border-radius: 22px;
    background: var(--primary-color);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
    filter: blur(8px);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 
        0 20px 40px var(--shadow-color),
        0 0 0 1px var(--primary-color),
        0 0 30px rgba(29, 161, 242, 0.2);
}

.feature-card:hover::before {
    opacity: 0.3;
}

.feature-card h3 {
    color: var(--text-primary);
    margin: 1.5rem 0;
    font-size: 1.8rem;
    font-weight: 600;
    position: relative;
    padding-left: 1rem;
    transition: transform 0.3s ease;
}

.feature-card:hover h3 {
    transform: translateX(8px);
}

.feature-card h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: height 0.3s ease;
}

.feature-card:hover h3::before {
    height: 32px;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1.1rem;
    transition: color 0.3s ease;
}

.feature-card:hover p {
    color: var(--text-primary);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .hero {
        padding: 6rem 0 4rem;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .hero p {
        font-size: 1.2rem;
        padding: 0 1rem;
    }

    .features {
        grid-template-columns: 1fr;
        padding: 0 1rem;
    }

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

/* 主题切换按钮样式 */
.theme-switch {
    position: relative;
    display: inline-block;
    margin-left: 2rem;
    cursor: pointer;
}

.theme-icon {
    font-size: 1.2rem;
    color: var(--text-primary);
    transition: transform 0.3s ease;
}

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

/* 移除旧的滑块样式 */
.theme-slider,
.theme-slider:before,
.theme-slider:after,
.system-theme-icon {
    display: none;
}

/* 卡片基础样式优化 */
.feature-card,
.product-card,
.solution-card {
    padding: 3rem 2.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    text-align: left;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: visible;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px var(--shadow-color);
}

/* 卡片悬停效果 */
.feature-card:hover,
.product-card:hover,
.solution-card:hover {
    transform: translateY(-8px);
    box-shadow: 
        0 20px 40px var(--shadow-color),
        0 0 0 1px var(--primary-color),
        0 0 30px rgba(29, 161, 242, 0.2);
}

/* 卡片发光效果 */
.feature-card::before,
.product-card::before,
.solution-card::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border-radius: 22px;
    background: var(--primary-color);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
    filter: blur(8px);
}

.feature-card:hover::before,
.product-card:hover::before,
.solution-card:hover::before {
    opacity: 0.3;
}

/* 卡片内容容器 */
.feature-card > *,
.product-card > *,
.solution-card > * {
    position: relative;
    z-index: 1;
}

/* 移除之前的背景光效 */
.feature-card::after,
.product-card::after,
.solution-card::after {
    display: none;
}

/* 关于我们页面样式 */
.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    margin-top: 2rem;
}

.about-section {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px var(--shadow-color);
}

.about-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-color);
    border-color: var(--primary-color);
}

.about-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    position: relative;
    padding-bottom: 1rem;
}

.about-section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

.about-section p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.about-section:hover p {
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-section {
        padding: 2rem;
    }
    
    .about-section h2 {
        font-size: 1.8rem;
    }
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
    z-index: 1000;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 3px;
    transition: all 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav-links {
        display: flex;
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: var(--nav-bg);
        backdrop-filter: blur(10px);
        padding: 80px 2rem 2rem;
        flex-direction: column;
        gap: 1.5rem;
        transition: right 0.3s ease;
        box-shadow: -5px 0 15px var(--shadow-color);
        z-index: 999;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links a {
        font-size: 1.2rem;
        padding: 0.5rem 0;
        border-bottom: 1px solid var(--border-color);
        width: 100%;
        text-align: left;
    }

    .nav-links a:last-child {
        border-bottom: none;
    }

    .language-selector {
        margin-left: 1rem;
    }

    /* 确保导航栏在移动端正确显示 */
    nav {
        padding: 1rem 5%;
    }

    /* 调整logo大小 */
    .logo {
        font-size: 1.3rem;
    }
}