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

:root {
    /* 主色调 */
    --primary-blue: #4A90E2;
    --dark-blue: #2C5F8D;
    --light-blue: #E8F4FD;
    
    /* 辅助色 */
    --white: #FFFFFF;
    --light-gray: #F7F9FB;
    --text-dark: #333333;
    --text-gray: #666666;
    --success-green: #52C41A;
    --warning-orange: #FA8C16;
    
    /* 间距 */
    --section-padding: 80px 20px;
    --container-width: 1200px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--white);
    overflow-x: hidden;
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 容器 */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: var(--white);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 600;
    color: var(--dark-blue);
    text-decoration: none;
}

.navbar-brand .logo {
    width: 40px;
    height: 40px;
    margin-right: 10px;
    /* Logo图片样式 */
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

.navbar-menu a {
    color: var(--text-dark);
    text-decoration: none;
    transition: color 0.3s;
    font-weight: 500;
}

.navbar-menu a:hover {
    color: var(--primary-blue);
}

.navbar-buttons {
    display: flex;
    gap: 15px;
}

/* 按钮样式 */
.btn {
    padding: 10px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

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

.btn-primary:hover {
    background: var(--dark-blue);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

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

.btn-outline:hover {
    background: var(--primary-blue);
    color: white;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    z-index: 1001;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: all 0.3s;
}

/* 移动端菜单展开样式 */
@media (max-width: 768px) {
    .navbar-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        transition: left 0.3s ease;
        gap: 0;
    }

    .navbar-menu li {
        width: 100%;
        padding: 15px 0;
        border-bottom: 1px solid #f0f0f0;
    }

    .navbar-menu li:last-child {
        border-bottom: none;
    }

    .navbar-buttons {
        position: fixed;
        top: auto;
        left: -100%;
        width: calc(100% - 40px);
        flex-direction: column;
        padding: 20px;
        background: var(--white);
        gap: 10px;
        transition: left 0.3s ease;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    }

    .navbar.menu-open .navbar-menu {
        left: 0;
        display: flex;
    }

    .navbar.menu-open .navbar-buttons {
        left: 0;
        display: flex;
        top: 290px;
    }
}

/* ==================== Hero Section ==================== */
.hero {
    padding: 150px 20px 80px;
    background: linear-gradient(135deg, #E8F4FD 0%, #FFFFFF 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(74, 144, 226, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
}

.hero-content h1 {
    font-size: 48px;
    color: var(--dark-blue);
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content p {
    font-size: 20px;
    color: var(--text-gray);
    margin-bottom: 30px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.hero-buttons .btn {
    padding: 14px 32px;
    font-size: 18px;
}

.hero-image {
    position: relative;
}

.hero-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

/* ==================== Features Section ==================== */
.features {
    padding: var(--section-padding);
    background: var(--white);
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 36px;
    color: var(--dark-blue);
    margin-bottom: 15px;
}

.section-title p {
    font-size: 18px;
    color: var(--text-gray);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--white);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid #E8E8E8;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-blue);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    color: var(--dark-blue);
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-gray);
    line-height: 1.8;
}

/* ==================== Demo Section ==================== */
.demo {
    padding: var(--section-padding);
    background: var(--light-gray);
}

.demo .container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
}

.demo-image {
    position: relative;
}

.demo-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.demo-tabs {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 20px;
}

.demo-tab {
    padding: 15px 20px;
    background: var(--white);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    border-left: 3px solid transparent;
}

.demo-tab:hover, .demo-tab.active {
    border-left-color: var(--primary-blue);
    background: var(--light-blue);
}

.demo-tab h4 {
    color: var(--dark-blue);
    margin-bottom: 5px;
}

.demo-tab p {
    color: var(--text-gray);
    font-size: 14px;
}

/* ==================== Performance Section ==================== */
.performance {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 100%);
    color: white;
}

.performance .section-title h2,
.performance .section-title p {
    color: white;
}

.performance-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
}

.performance-item {
    text-align: center;
}

.performance-value {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 10px;
    color: white;
}

.performance-label {
    font-size: 16px;
    opacity: 0.9;
}

/* ==================== Quick Start Section ==================== */
.quick-start {
    padding: var(--section-padding);
    background: var(--white);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 40px;
}

.step {
    text-align: center;
    position: relative;
}

.step::after {
    content: '→';
    position: absolute;
    right: -20px;
    top: 30px;
    font-size: 30px;
    color: var(--primary-blue);
}

.step:last-child::after {
    display: none;
}

.step-icon {
    width: 80px;
    height: 80px;
    background: var(--light-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    margin: 0 auto 20px;
}

.step h3 {
    color: var(--dark-blue);
    margin-bottom: 10px;
}

.step p {
    color: var(--text-gray);
}

/* ==================== Tech Stack Section ==================== */
.tech-stack {
    padding: var(--section-padding);
    background: var(--light-gray);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.tech-item {
    background: var(--white);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s;
}

.tech-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.tech-item .icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.tech-item h4 {
    color: var(--dark-blue);
    margin-bottom: 8px;
}

.tech-item p {
    color: var(--text-gray);
    font-size: 14px;
}

/* ==================== Use Cases Section ==================== */
.use-cases {
    padding: var(--section-padding);
    background: var(--white);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.case-card {
    background: var(--light-blue);
    padding: 40px;
    border-radius: 12px;
    border-left: 4px solid var(--primary-blue);
}

.case-card h3 {
    color: var(--dark-blue);
    margin-bottom: 15px;
    font-size: 22px;
}

.case-card p {
    color: var(--text-gray);
    line-height: 1.8;
}

/* ==================== CTA Section ==================== */
.cta {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--light-blue) 0%, #FFFFFF 100%);
    text-align: center;
}

.cta h2 {
    font-size: 40px;
    color: var(--dark-blue);
    margin-bottom: 20px;
}

.cta p {
    font-size: 18px;
    color: var(--text-gray);
    margin-bottom: 40px;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.cta-buttons .btn {
    padding: 14px 32px;
    font-size: 18px;
}

.github-link {
    margin-top: 30px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text-gray);
    text-decoration: none;
    transition: color 0.3s;
}

.github-link:hover {
    color: var(--primary-blue);
}

/* ==================== Footer ==================== */
.footer {
    padding: 60px 20px 30px;
    background: var(--text-dark);
    color: white;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    margin-bottom: 20px;
    font-size: 18px;
}

.footer-section p,
.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    line-height: 2;
    display: block;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-image {
        order: -1;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .demo .container {
        grid-template-columns: 1fr;
    }

    .performance-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .navbar-menu,
    .navbar-buttons {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        padding: 120px 20px 60px;
    }

    .hero-content h1 {
        font-size: 32px;
    }

    .hero-content p {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
    }

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

    .steps {
        grid-template-columns: 1fr;
    }

    .step::after {
        content: '↓';
        right: 50%;
        top: auto;
        bottom: -30px;
        transform: translateX(50%);
    }

    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }

    .performance-grid {
        grid-template-columns: 1fr;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    /* 移动端Footer样式 - 只显示底部栏 */
    .footer {
        padding: 30px 20px 20px;
    }

    .footer-content {
        display: none;  /* 移动端隐藏上面的四栏内容 */
    }

    .footer-bottom {
        border-top: none;  /* 移除顶部边框 */
        padding-top: 0;
    }
}

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

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

/* ==================== 代码块样式 ==================== */
.code-block {
    background: var(--text-dark);
    color: #52C41A;
    padding: 20px;
    border-radius: 8px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    margin: 30px 0;
    overflow-x: auto;
}