/* --- 核心变量定义 --- */
:root {
    --color-background: #0A192F; /* 深空蓝 - 主背景 */
    --color-text-primary: #CCD6F6; /* 浅灰蓝 - 主要文字 */
    --color-text-secondary: #8892B0; /* 高级灰 - 次要文字 */
    --color-primary: #64FFDA;       /* 赛博青 - 链接、高光 */
    --color-accent: #FF8C42;        /* 日出橙 - 点缀、按钮 */
    --color-surface: #112240;        /* 卡片背景色 */
    --color-border: #1E2D47;        /* 边框色 */

    --font-family-heading: 'Montserrat', 'Noto Sans SC', sans-serif;
    --font-family-body: 'Noto Sans SC', sans-serif;

    --container-width: 1100px;
    --header-height: 80px;
    --border-radius: 8px;
}

/* --- 全局重置与基础设定 --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-background);
    color: var(--color-text-primary);
    font-family: var(--font-family-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

body.no-scroll {
    overflow: hidden;
}

.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
}

/* --- 头部与导航样式 --- */
.site-header {
    height: var(--header-height);
    background-color: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    width: 100%;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo a {
    color: var(--color-primary);
    font-family: var(--font-family-heading);
    font-size: 24px;
    font-weight: 700;
    text-decoration: none;
    transition: color 0.3s ease;
}
.logo a:hover {
    color: var(--color-accent);
}

/* 在这里添加下面的新样式 */
.logo img {
    height: 45px; /* 设置logo的高度为45像素 */
    width: auto;  /* 宽度自动调整以保持比例 */
    vertical-align: middle; /* 确保图片垂直居中对齐 */
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

.main-nav a {
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: 16px;
    padding: 5px 0;
    position: relative;
    transition: color 0.3s ease;
    font-weight:bold;
}

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

.main-nav a:hover, .main-nav a.active {
    color: var(--color-primary);
}
.main-nav a:hover::after, .main-nav a.active::after {
    width: 100%;
}

/* --- 主内容区域样式 --- */
.hero {
/* 将背景图应用到这里 */
    background-image: linear-gradient(rgba(10, 25, 47, 0.7), rgba(10, 25, 47, 0.9)), url('../images/hero-background.jpg');
    background-size: cover; /* 确保背景图覆盖整个区域 */
    background-position: center; /* 居中显示背景图 */
    
    padding: 120px 0; /* 增加一点内边距，让效果更好 */

    text-align: center;
}

.hero-title {
    font-family: var(--font-family-heading);
    font-size: clamp(40px, 5vw, 60px);
    color: var(--color-text-primary);
    margin-bottom: 20px;
    font-weight: 700;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: clamp(18px, 2.5vw, 20px);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* --- Bento Grid 布局 --- */
.bento-container {
    padding: 20px 0 100px;
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.bento-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 25px;
    text-decoration: none;
    color: var(--color-text-primary);
    transition: transform 0.3s ease, background-color 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.bento-card:hover {
    transform: translateY(-8px);
    background-color: #1A2C4D;
}
/* 在这里添加下面的新样式 */
.card-featured-ai101 {
    /* 在图片上叠加一层半透明深色蒙版，确保文字清晰可读 */
    background-image: linear-gradient(rgba(17, 34, 64, 0.5), rgba(17, 34, 64, 0.7)), url('../images/feature-ai-101.jpg');
    background-size: cover;
    background-position: center;
    
    /* 我们可以让这张特色卡片的文字更突出 */
    color: #FFFFFF; /* 强制文字为纯白色 */
}

.card-featured-ai101 .card-content p {
    color: var(--color-text-primary); /* 让段落文字颜色也更亮一些 */
}

/* 在这里添加下面的新样式 */
.card-featured-ai-action {
    /* 同样添加深色蒙版以保证文字可读性 */
    background-image: linear-gradient(rgba(17, 34, 64, 0.5), rgba(17, 34, 64, 0.7)), url('../images/feature-ai-in-action.jpg');
    background-size: cover;
    background-position: center;
}

/* 如果希望这张卡片的文字也更突出，可以添加下面这段 */
.card-featured-ai-action .card-content h3 {
    color: var(--color-primary);
}
.card-featured-ai-action .card-content p {
    color: var(--color-text-primary);
}
/* 在这里添加下面的新样式 */
.card-featured-resources {
    /* 使用蒙版确保文字可读 */
    background-image: linear-gradient(rgba(17, 34, 64, 0.5), rgba(17, 34, 64, 0.7)), url('../images/feature-resources.jpg');
    background-size: cover;
    background-position: center;
    
    color: #FFFFFF;
}

.card-featured-resources .card-content h3 {
    color: var(--color-primary); /* 标题使用科技青色 */
}
.card-featured-resources .card-content p {
    color: var(--color-text-primary);
}
/* 在这里添加下面的新样式 */
.card-featured-industry-ai {
    /* 使用蒙版确保文字可读 */
    background-image: linear-gradient(rgba(17, 34, 64, 0.6), rgba(17, 34, 64, 0.8)), url('../images/feature-industry-ai.jpg');
    background-size: cover;
    background-position: center;

    color: #FFFFFF;
}

.card-featured-industry-ai .card-content h3 {
    color: var(--color-primary); /* 标题使用科技青色 */
}
.card-featured-industry-ai .card-content p {
    color: var(--color-text-primary);
}
/* 在这里添加下面的新样式 */
.card-featured-ai-agents {
    /* 依旧使用深色蒙版来确保文字的可读性 */
    background-image: linear-gradient(rgba(17, 34, 64, 0.6), rgba(17, 34, 64, 0.8)), url('../images/feature-ai-agents.jpg');
    background-size: cover;
    background-position: center;

    /* 我们可以让这张卡片的标题使用点缀色，增加重要性 */
    color: #FFFFFF;
}

.card-featured-ai-agents .card-content h3 {
    color: var(--color-accent); /* 使用我们的“日出橙”点缀色 */
}
.card-featured-ai-agents .card-content p {
    color: var(--color-text-primary);
}



.bento-card.card-large {
    grid-column: span 2;
}

.card-content h3 {
    font-family: var(--font-family-heading);
    color: var(--color-primary);
    margin-bottom: 10px;
    font-size: 20px;
}

.card-content p {
    color: var(--color-text-secondary);
    font-size: 16px;
    line-height: 1.7;
}

.card-icon {
    margin-top: 20px;
    align-self: flex-end;
}

.card-icon svg {
    width: 60px;
    height: 60px;
    color: rgba(100, 255, 218, 0.2); /* 半透明的青色 */
}

/* --- 页脚样式 --- */
.site-footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.site-footer p {
    margin: 5px 0;
    font-size: 14px;
}

/* --- 移动端菜单按钮 --- */
.menu-toggle {
    display: none; /* 默认隐藏 */
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 25px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 110;
}

.menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* 汉堡菜单的 "X" 动画 */
.menu-toggle.active span:nth-child(1) {
    transform: translateY(11.5px) rotate(45deg);
}
.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
    transform: translateY(-11.5px) rotate(-45deg);
}

/* --- 响应式设计 --- */
@media (max-width: 1024px) {
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .bento-card.card-large {
        grid-column: span 2; /* 在平板上大卡片依然横跨 */
    }
}

@media (max-width: 768px) {
    .main-nav {
        position: fixed;
        top: 0;
        right: -100%; /* 初始位置在屏幕外 */
        width: 70%;
        height: 100vh;
        background-color: var(--color-surface);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right 0.4s ease-in-out;
        padding-top: var(--header-height);
    }
    
    .main-nav.active {
        right: 0; /* 激活时滑入屏幕 */
    }

    .main-nav ul {
        flex-direction: column;
        align-items: center;
        gap: 40px;
    }

    .main-nav a {
        font-size: 20px;
    }

    .menu-toggle {
        display: flex;
    }

    .bento-grid {
        grid-template-columns: 1fr; /* 手机上变为单列 */
    }

    .bento-card.card-large {
        grid-column: span 1; /* 所有卡片都占一整行 */
    }
}