:root {
    /* 深色主题 + 蓝绿色渐变 */
    --bg-gradient-start: #0a1929;
    --bg-gradient-end: #1a2f4a;
    --sidebar-bg: rgba(10, 25, 41, 0.95);
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-primary: #e8f4f8;
    --text-secondary: #a8c5d0;
    --text-muted: #6b8a9a;
    --primary: #00d4ff;
    --primary-dark: #00a8cc;
    --accent: #00ff88;
    --accent-purple: #8b5cf6;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.4);
    --radius: 20px;
    --sidebar-width: 240px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    background-attachment: fixed;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 布局容器 */
.layout-wrapper {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏 */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--card-border);
    padding: 0;
    z-index: 100;
    overflow-y: auto;
}

.sidebar-content {
    padding: 24px 20px;
}

.brand {
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--card-border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
}

.logo-icon {
    font-size: 24px;
    line-height: 1;
}

.logo-text {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: -0.5px;
}

.tagline {
    color: var(--text-muted);
    font-size: 10px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

/* 侧边栏导航 */
.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.3s ease;
    font-size: 12px;
    font-weight: 500;
}

.nav-item i {
    font-size: 14px;
    width: 18px;
    text-align: center;
}

.nav-item:hover {
    background: rgba(0, 212, 255, 0.1);
    color: var(--primary);
    transform: translateX(4px);
}

.nav-item.active {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.2) 0%, rgba(0, 255, 136, 0.1) 100%);
    color: var(--primary);
    border-left: 3px solid var(--primary);
}

/* 主内容区 */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    width: calc(100% - var(--sidebar-width));
}

.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
    padding: 60px 40px;
}

/* Hero Section */
.hero-section {
    margin-bottom: 80px;
    text-align: center;
    padding: 60px 0;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 50%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-weight: 400;
}

.hero-meta {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 500;
}

/* 内容区块 */
.content-section {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 40px;
    margin-bottom: 32px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.content-section:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: rgba(0, 212, 255, 0.3);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.section-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.2) 0%, rgba(0, 255, 136, 0.2) 100%);
    border-radius: 12px;
    color: var(--primary);
    font-size: 20px;
}

.section-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.section-body {
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.8;
}

.section-body p {
    margin-bottom: 16px;
}

.section-body strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* 介绍区块特殊样式 */
.intro-section {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1) 0%, rgba(0, 255, 136, 0.05) 100%);
    border-color: rgba(0, 212, 255, 0.2);
}

.intro-text {
    font-size: 18px;
    line-height: 1.9;
    color: var(--text-primary);
}

/* 应用介绍两栏布局 */
.intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 8px;
}

.intro-card {
    padding: 24px;
    background: rgba(0, 212, 255, 0.05);
    border: 1px solid rgba(0, 212, 255, 0.15);
    border-radius: 16px;
    transition: all 0.3s ease;
}

.intro-card:hover {
    background: rgba(0, 212, 255, 0.08);
    border-color: rgba(0, 212, 255, 0.25);
    transform: translateY(-2px);
}

.intro-card-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.intro-card .intro-text {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin: 0;
}

/* 数据列表 */
.data-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.data-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: rgba(0, 212, 255, 0.05);
    border: 1px solid rgba(0, 212, 255, 0.1);
    border-radius: 16px;
    transition: all 0.3s ease;
}

.data-item:hover {
    background: rgba(0, 212, 255, 0.1);
    border-color: rgba(0, 212, 255, 0.3);
    transform: translateX(4px);
}

.data-item i {
    font-size: 24px;
    color: var(--primary);
    flex-shrink: 0;
}

.data-item strong {
    display: block;
    color: var(--text-primary);
    font-size: 18px;
    margin-bottom: 8px;
    font-weight: 600;
}

.data-item p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 15px;
}

/* 功能列表 */
.feature-list {
    list-style: none;
    padding: 0;
    margin: 20px 0;
}

.feature-list li {
    padding: 16px 0 16px 32px;
    position: relative;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
    font-size: 18px;
}

/* 高亮框 */
.highlight-box {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
    background: linear-gradient(135deg, rgba(0, 255, 136, 0.1) 0%, rgba(0, 212, 255, 0.1) 100%);
    border: 1px solid rgba(0, 255, 136, 0.3);
    border-radius: 16px;
    margin-top: 24px;
}

.highlight-box i {
    font-size: 24px;
    color: var(--accent);
}

.highlight-box p {
    margin: 0;
    color: var(--text-primary);
    font-size: 16px;
}

/* 联系区块 */
.contact-section {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(0, 212, 255, 0.1) 100%);
    border-color: rgba(139, 92, 246, 0.3);
}

.contact-box {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 16px;
    margin-top: 24px;
    transition: all 0.3s ease;
}

.contact-box:hover {
    background: rgba(0, 212, 255, 0.15);
    border-color: rgba(0, 212, 255, 0.4);
    transform: scale(1.02);
}


.contact-box i {
    font-size: 24px;
    color: var(--primary);
}

.contact-email {
    color: var(--primary);
    text-decoration: none;
    font-size: 18px;
    font-weight: 600;
    display: inline-block;
    cursor: default;
}

/* 页脚 */
.site-footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 60px;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    
    .main-content {
        margin-left: 0;
        width: 100%;
    }
    
    .content-wrapper {
        padding: 40px 24px;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .content-section {
        padding: 24px 20px;
    }
    
    .section-header h2 {
        font-size: 22px;
    }
    
    .section-icon {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
    
    .data-item {
        flex-direction: column;
        gap: 12px;
    }
    
    .intro-text {
        font-size: 16px;
    }
    
    .intro-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .intro-card {
        padding: 20px;
    }
    
    .intro-card-title {
        font-size: 20px;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 212, 255, 0.3);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 212, 255, 0.5);
}