:root {
            --base-black: #0A0A0A;
            --base-gray: #1A1A1A;
            --accent-blue: #00F0FF;
            --accent-pink: #FF00F0;
            --accent-purple: #9D00FF;
            --acrylic-bg: rgba(34, 34, 34, 0.6);
            --text-color: rgba(255, 255, 255, 0.8);
            --grid-color: #333333;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Courier New', Courier, monospace;
        }

        /* body {
            background-color: var(--base-black);
            background-image: 
                linear-gradient(rgba(51, 51, 51, 0.1) 1px, transparent 1px),
                linear-gradient(90deg, rgba(51, 51, 51, 0.1) 1px, transparent 1px);
            background-size: 20px 20px;
            color: var(--text-color);
            position: relative;
            min-height: 100vh;
            overflow-x: hidden;
        } */
         body {
            background-color: var(--base-black);
            /* ！！修改：仅保留渐变（原图片移到伪元素中，避免滤镜影响文字） */
            background-image: 
                linear-gradient(rgba(12, 12, 12, 0.4) 1px, transparent 1px),
                linear-gradient(90deg, rgba(51, 51, 51, 0.1) 1px, transparent 1px);
            
            /* 渐变的自适应属性（保持不变） */
            background-size: 20px 20px, 20px 20px;
            background-repeat: repeat; /* 渐变需要重复，原代码可补充此属性 */
            
            color: var(--text-color);
            position: relative; /* 必须保留：伪元素定位的参考 */
            min-height: 100vh;
            overflow-x: hidden;
        }

        /* ！！新增伪元素：单独承载背景图，仅对图片生效滤镜 */
        body::before {
            content: ""; /* 伪元素必须有content */
            position: absolute; /* 脱离文档流，覆盖整个body */
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1; /* 放在最下层（低于渐变和文字） */
            
            /* 原背景图的属性（迁移到伪元素） */
            background-image: url("https://pic1.imgdb.cn/item/67837273d0e0a243d4f399ff.jpg"); /* 电脑端图片URL */
            background-size: cover; /* 覆盖容器 */
            background-position: center center; /* 居中 */
            background-repeat: no-repeat;
            background-attachment: fixed; /* 滚动时固定（保持原需求） */
            
            /* ！！核心效果：调暗 + 模糊 */
            filter: brightness(0.6) blur(8px); /* 可按需调整数值 */
            /* brightness(0.6)：亮度60%（值越小越暗，范围0~1）；blur(8px)：模糊8px（值越大越模糊） */
        }

        /* 3. 媒体查询：手机端（单独替换伪元素的图片） */
        @media (max-width: 768px) {
            body::before {
                /* ！！修改：手机端图片URL */
                background-image: url("https://pic1.imgdb.cn/item/67837273d0e0a243d4f399ff.jpg");
                /* 手机端可单独调整滤镜（示例：稍弱的模糊，更暗的亮度） */
                /* filter: brightness(0.5) blur(5px); */
            }
            
            /* 渐变属性若需调整，可在此处补充（如手机端缩小网格间距） */
            /* body { background-size: 15px 15px, 15px 15px; } */
        }
        /* body {
            background-color: var(--base-black);
            /* 1. 背景层叠顺序：先写的在下层，后写的在上层 
            - 电脑端背景图（下层）→ 原有网格渐变（上层）
            - 若想让图片在渐变之上，互换顺序即可
            */
            background-image: 
                url("img/image.jpg"), /* 电脑端图片（替换成你的URL） */
                linear-gradient(rgba(51, 51, 51, 0.1) 1px, transparent 1px),
                linear-gradient(90deg, rgba(51, 51, 51, 0.1) 1px, transparent 1px);
            
            /* 2. 背景图自适应核心属性 */
            background-size: 
                cover, /* 图片：覆盖整个容器（优先保证填满，可能裁剪边缘） */
                20px 20px, /* 网格渐变：保持原有20px间距 */
                20px 20px; /* 网格渐变：保持原有20px间距 */
            background-position: center center; /* 图片：垂直+水平居中 */
            background-repeat: no-repeat; /* 图片：不重复平铺 */
            background-attachment: fixed; /* 可选：滚动时背景固定（不随页面滚动），不需要可删 */
            
            color: var(--text-color);
            position: relative;
            min-height: 100vh;
            overflow-x: hidden;
        }

        /* 3. 媒体查询：手机端（屏幕宽度 ≤ 768px，可根据需求调整断点） */
        @media (max-width: 768px) {
            body {
                background-image: 
                    url("img/image.jpg"), /* 替换成手机端图片URL */
                    linear-gradient(rgba(51, 51, 51, 0.1) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(51, 51, 51, 0.1) 1px, transparent 1px);
                /* 手机端可单独调整自适应规则（若与电脑端不同），示例： */
                /* background-size: contain, 20px 20px, 20px 20px; */
            }
        } */

        /* 网格点动画 */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 0;
        }

        /* 装饰图形 */
        .floating-shape {
            position: fixed;
            background-color: var(--base-gray);
            opacity: 0.7;
            pointer-events: none;
            z-index: 0;
            border: 1px solid var(--accent-blue);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
            animation: float 15s infinite ease-in-out, glitch 10s infinite;
        }

        .shape-1 {
            width: 120px;
            height: 120px;
            top: 20%;
            left: 10%;
            transform: rotate(45deg);
        }

        .shape-2 {
            width: 80px;
            height: 80px;
            top: 60%;
            left: 85%;
            clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
        }

        .shape-3 {
            width: 100px;
            height: 60px;
            top: 40%;
            left: 80%;
            border-radius: 5px;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0) rotate(0deg); }
            50% { transform: translateY(-20px) rotate(10deg); }
        }

        @keyframes glitch {
            0%, 95%, 100% { opacity: 0.7; }
            96% { opacity: 0; }
            97% { opacity: 0.3; }
            98% { opacity: 0; }
            99% { opacity: 0.5; }
        }

        /* 导航栏 - 磨砂金属效果（新增磨砂半透明） */
        .navbar {
            /* 1. 半透明背景：将纯色改为 rgba，最后一位 0.7 是透明度（0-1 可调） */
            background-color: rgba(40, 40, 40, 0); /* 替换原 var(--base-gray)，也可定义为变量：--base-gray: rgba(40,40,40,0.7) */
            /* 保留原有网格纹理，透明度 0.03 已很淡，不影响磨砂 */
            background-image: linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
            background-size: 20px 100%;

            /* 2. 磨砂核心：blur(8px) 是模糊半径，数值越大磨砂越明显 */
            backdrop-filter: blur(5px); 
            -webkit-backdrop-filter: blur(5px); /* 兼容 Safari 浏览器 */

            /* 保留原有边框、阴影、定位等样式 */
            border-bottom: 1px solid var(--accent-blue);
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
            position: sticky;
            top: 0;
            z-index: 100;
            padding: 1rem 5%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: all 0.3s ease;
            overflow: hidden;
        }

        .navbar::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.1), transparent);
            transition: 0.5s;
            animation: navbarGlow 8s infinite;
        }

        @keyframes navbarGlow {
            0%, 100% { left: -100%; }
            50% { left: 100%; }
        }

        .navbar .logo {
            color: white;
            font-size: 1.5rem;
            font-weight: bold;
            text-shadow: 0 0 5px var(--accent-pink);
            position: relative;
            animation: textGlitch 15s infinite;
        }

        .logo::after {
            content: '杨CC资源分享站';
            position: absolute;
            top: 0;
            left: 1px;
            color: var(--accent-pink);
            opacity: 0.7;
            z-index: -1;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
        }

        .nav-link {
            color: var(--text-color);
            text-decoration: none;
            position: relative;
            padding: 0.5rem 0;
            transition: all 0.3s ease;
            background-color: transparent;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 1px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-pink));
            transition: width 0.3s ease;
        }

        .nav-link:hover {
            color: white;
            text-shadow: 0 0 5px var(--accent-blue);
        }

        .nav-link:hover::after {
            width: 100%;
        }

        .nav-link.active {
            color: var(--accent-blue);
        }

        .hamburger {
            display: none;
            color: var(--accent-blue);
            font-size: 1.5rem;
            cursor: pointer;
            text-shadow: 0 0 5px var(--accent-blue);
        }

        /* 主内容区 */
        .main-content {
            /* max-width: 1200px; */
            max-width: 100%;
            margin: 2rem auto;
            padding: 0 2rem;
            position: relative;
            z-index: 10;
        }

        

        .page-title {
            color: white;
            text-align: center;
            margin-bottom: 3rem;
            font-size: 2.5rem;
            position: relative;
            text-shadow: 0 0 10px var(--accent-pink);
            animation: textGlitch 15s infinite;
        }

        .page-title::before {
            content: attr(data-text);
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            color: var(--accent-pink);
            opacity: 0.5;
            z-index: -1;
            transform: translate(2px, 2px);
        }

        @keyframes textGlitch {
            0%, 95%, 100% { transform: none; }
            96% { transform: translate(-2px, 2px); }
            97% { transform: translate(2px, -2px); }
            98% { transform: translate(-2px, -2px); }
            99% { transform: translate(2px, 2px); }
        }

        /* 分类网格 */
        .category-grid {
            display: grid;
            /* grid-template-columns: repeat(auto-fit, minmax(calc(25% - 1.6rem), 1fr)); */
            grid-template-columns: repeat(auto-fit, minmax(calc(20% - 3rem), 2fr));
            gap: 2rem;
            margin-bottom: 3rem;
        }

        /* 分类卡片 - 亚克力风格 */
        .category-card {
            background: var(--acrylic-bg);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(0, 240, 255, 0.3);
            border-radius: 8px;
            padding: 1.5rem;
            text-align: center;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        }

        .category-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            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: 15px 15px;
            opacity: 0.5;
            pointer-events: none;
        }

        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(157, 0, 255, 0.4);
            border-color: var(--accent-pink);
        }

        .category-icon {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            color: var(--accent-blue);
            text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
            transition: all 0.3s ease;
        }

        .category-card:hover .category-icon {
            color: var(--accent-pink);
            transform: scale(1.1);
        }

        .category-title {
            color: white;
            margin-bottom: 0.5rem;
            position: relative;
            text-shadow: 0 0 5px rgba(0, 240, 255, 0.3);
        }

        .category-title::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 1px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-pink));
            transition: width 0.3s ease;
        }

        .category-card:hover .category-title::after {
            width: 80%;
        }

        .category-desc {
            font-size: 0.9rem;
            margin-bottom: 1.5rem;
            line-height: 1.4;
        }

        /* 按钮 - 玻璃态金属风格 */
        .category-btn {
            display: inline-block;
            background: linear-gradient(135deg, var(--base-gray), #2a2a2a);
            color: white;
            text-decoration: none;
            padding: 0.5rem 1.5rem;
            border-radius: 4px;
            border: 1px solid rgba(0, 240, 255, 0.5);
            position: relative;
            overflow: hidden;
            transition: all 0.3s ease;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
        }

        .category-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
            transform: translateX(-100%);
            transition: 0.5s;
        }

        .category-btn:hover {
            border-color: var(--accent-pink);
            box-shadow: 0 0 10px rgba(255, 0, 240, 0.5);
        }

        .category-btn:hover::before {
            transform: translateX(100%);
        }

        .category-btn:active {
            transform: scale(0.95);
        }

        .category-btn:active::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            background: rgba(157, 0, 255, 0.5);
            border-radius: 50%;
            transform: translate(-50%, -50%);
            animation: pulse 0.6s;
        }

        @keyframes pulse {
            0% { width: 0; height: 0; opacity: 0.8; }
            100% { width: 200px; height: 200px; opacity: 0; }
        }

        /* 二级分类内容区 */
        .subcategory-container {
            margin-top: 2rem;
        }

        .subcategory-content {
            display: none;
            margin-top: 2rem;
            padding: 2rem;
            background: var(--acrylic-bg);
            backdrop-filter: blur(10px);
            border-radius: 8px;
            border: 1px solid rgba(0, 240, 255, 0.3);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
            position: relative;
            overflow: hidden;
        }

        .subcategory-content::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: 
                linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
            background-size: 20px 20px;
            pointer-events: none;
        }

        .subcategory-content h3 {
            color: var(--accent-blue);
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid rgba(0, 240, 255, 0.3);
            text-shadow: 0 0 5px rgba(0, 240, 255, 0.5);
            position: relative;
        }

        .block-title {
            color: var(--accent-pink);
            margin: 1.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid rgba(255, 0, 240, 0.3);
            text-shadow: 0 0 5px rgba(255, 0, 240, 0.5);
        }

       /* 基础动画定义 - 确保所有动画无缝循环 */
@keyframes neonBorderFlow {
    0% { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 0 5px currentColor, 0 0 10px currentColor; }
    50% { box-shadow: 0 0 10px currentColor, 0 0 20px currentColor; }
}

@keyframes scanLine {
    0% { transform: translateY(-100%) rotate(0deg); }
    100% { transform: translateY(100%) rotate(0deg); }
}

@keyframes float {
    0%, 100% { transform: translateX(5px) translateY(0); }
    50% { transform: translateX(5px) translateY(-3px); }
}

/* 下载项 - 基础样式 */
/* 基础样式 - 增强圆角效果 */
.download-item {
    color: #00f0ff; /* 基础霓虹蓝 - 讲解过 */
    background: rgba(10, 10, 30, 0.8);
    border-left: 4px solid #00f0ff;
    border-radius: 8px;
    padding: 1rem 1.2rem;
    margin-bottom: 1rem;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
    text-shadow: 0 0 8px rgba(0, 240, 255, 0.7), 0 0 15px rgba(0, 240, 255, 0.4);
    box-shadow: 0 0 8px rgba(0, 240, 255, 0.3);
    animation: subtleFloat 6s ease-in-out infinite;
    background-color: transparent
}

/* 赛博朋克网格背景增强 - 讲解过 */
.download-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 200%;
    background-image: 
        linear-gradient(rgba(0, 240, 255, 0.15) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.15) 1px, transparent 1px);
    background-size: 20px 20px;
    pointer-events: none;
    z-index: 1;
    animation: gridScan 8s linear infinite;
    
}

/* 霓虹发光边框 - 讲解过 */
.download-item::after {
    content: '';
    position: absolute;
    top: -3px;
    left: -3px;
    right: -3px;
    bottom: -3px;
    border: 1px solid #00f0ff;
    border-radius: 10px;
    z-index: 0;
    opacity: 0.6;
    filter: blur(5px);
    transition: all 0.4s ease;
    background: linear-gradient(
        to bottom,
        transparent 50%,
        rgba(0, 240, 255, 0.1) 51%,
        rgba(0, 240, 255, 0.1) 52%,
        transparent 53%
    );
    background-size: 100% 4px;
    animation: scanline 10s linear infinite;
}

/* 已讲解项 - hover效果（浅蓝色主题） */
.subcategory-content a:hover .download-item {
    color: #4deeea; /* 浅蓝 - 讲解过 */
    background: rgba(10, 30, 30, 0.9);
    border-left-color: #4deeea;
    transform: translateX(5px) translateY(-2px);
    box-shadow: 0 0 15px #4deeea, 0 0 30px rgba(77, 238, 234, 0.3);
    animation: float 4s ease-in-out infinite, 
               neonPulse 2s linear infinite,
               pulseScale 2s ease-in-out infinite;
    background-color: transparent
}

/* hover时网格变色 - 讲解过 */
.subcategory-content a:hover .download-item::before {
    background-image: 
        linear-gradient(rgba(77, 238, 234, 0.25) 1px, transparent 1px),
        linear-gradient(90deg, rgba(77, 238, 234, 0.25) 1px, transparent 1px);
}

/* hover时霓虹边框变色 - 讲解过 */
.subcategory-content a:hover .download-item::after {
    border-color: #4deeea;
    opacity: 0.8;
    box-shadow: 0 0 15px #4deeea, 0 0 30px rgba(77, 238, 234, 0.5);
    background: linear-gradient(
        to bottom,
        transparent 50%,
        rgba(77, 238, 234, 0.2) 51%,
        rgba(77, 238, 234, 0.2) 52%,
        transparent 53%
    );
}

/* 故障效果叠加层 - 讲解过 */
.download-item .glitch-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    z-index: 2;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.subcategory-content a:hover .download-item .glitch-overlay {
    opacity: 0.3;
    background: repeating-linear-gradient(
        transparent,
        transparent 2px,
        rgba(77, 238, 234, 0.4) 2px,
        rgba(77, 238, 234, 0.4) 4px
    );
    animation: glitch 2s linear infinite;
}

/* 未讲解下载项 - 基础样式（红色主题） */
.download-item_1 {
    color: #ff3a3a; /* 赛博红 - 未讲解 */
    background: rgba(30, 5, 5, 0.85);
    border-left: 4px solid #ff3a3a;
    border-radius: 8px;
    padding: 1rem 1.2rem;
    margin-bottom: 1rem;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
    text-shadow: 0 0 8px rgba(255, 58, 58, 0.7), 0 0 15px rgba(255, 58, 58, 0.4);
    box-shadow: 0 0 8px rgba(255, 58, 58, 0.3);
    animation: subtleFloat 7s ease-in-out infinite,
               warningPulse 3s ease-in-out infinite; /* 警示脉冲动画 */
    background-color: transparent
}

/* 未讲解项网格背景（红色主题） */
.download-item_1::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 200%;
    background-image: 
        linear-gradient(rgba(255, 58, 58, 0.15) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 58, 58, 0.15) 1px, transparent 1px);
    background-size: 20px 20px;
    pointer-events: none;
    z-index: 1;
    animation: gridScan 10s linear infinite reverse;
}

/* 未讲解项霓虹边框（红色主题） */
.download-item_1::after {
    content: '';
    position: absolute;
    top: -3px;
    left: -3px;
    right: -3px;
    bottom: -3px;
    border: 1px solid #ff3a3a;
    border-radius: 10px;
    z-index: 0;
    opacity: 0.6;
    filter: blur(5px);
    transition: all 0.4s ease;
    background: linear-gradient(
        to bottom,
        transparent 50%,
        rgba(255, 58, 58, 0.1) 51%,
        rgba(255, 58, 58, 0.1) 52%,
        transparent 53%
    );
    background-size: 100% 4px;
    animation: scanline 12s linear infinite;
}

/* 未讲解项 - hover效果（红色增强） */
.subcategory-content a:hover .download-item_1 {
    color: #ff6b6b; /* 亮红色 - 未讲解 */
    background: rgba(40, 5, 5, 0.95);
    border-left-color: #ff6b6b;
    transform: translateX(5px) translateY(-2px);
    box-shadow: 0 0 15px #ff6b6b, 0 0 30px rgba(255, 107, 107, 0.3);
    animation: float 4.5s ease-in-out infinite, 
               neonPulse 2s linear infinite,
               pulseScale 2s ease-in-out infinite,
               warningPulse 1.5s ease-in-out infinite; /* 加快警示动画 */
    background-color: transparent
}

/* 未讲解项hover网格变色 */
.subcategory-content a:hover .download-item_1::before {
    background-image: 
        linear-gradient(rgba(255, 107, 107, 0.25) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 107, 107, 0.25) 1px, transparent 1px);
}

/* 未讲解项hover霓虹边框变色 */
.subcategory-content a:hover .download-item_1::after {
    border-color: #ff6b6b;
    opacity: 0.8;
    box-shadow: 0 0 15px #ff6b6b, 0 0 30px rgba(255, 107, 107, 0.5);
    background: linear-gradient(
        to bottom,
        transparent 50%,
        rgba(255, 107, 107, 0.2) 51%,
        rgba(255, 107, 107, 0.2) 52%,
        transparent 53%
    );
}

/* 未讲解项故障效果（红色主题） */
.download-item_1 .glitch-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    z-index: 2;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.subcategory-content a:hover .download-item_1 .glitch-overlay {
    opacity: 0.4; /* 更高的不透明度增强警示 */
    background: repeating-linear-gradient(
        transparent,
        transparent 2px,
        rgba(255, 107, 107, 0.5) 2px,
        rgba(255, 107, 107, 0.5) 4px
    );
    animation: glitch 1.5s linear infinite; /* 更快的故障动画 */
}

/* 通用链接样式增强 */
.subcategory-content a {
    color: var(--text-color);
    text-decoration: none;
    display: block;
    transition: transform 0.3s ease;
}

.subcategory-content a:hover {
    transform: scale(1.005);
}

/* 内容内部元素动画 */
.download-item h3, .download-item_1 h3 {
    transition: all 0.3s ease;
    margin: 0 0 0.5rem 0;
}

.subcategory-content a:hover .download-item h3,
.subcategory-content a:hover .download-item_1 h3 {
    transform: translateX(3px);
}

.download-item p, .download-item_1 p {
    margin: 0;
    transition: all 0.3s ease 0.1s;
}

.subcategory-content a:hover .download-item p,
.subcategory-content a:hover .download-item_1 p {
    transform: translateX(5px);
}

/* 动画定义 */
@keyframes gridScan {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 0 40px;
    }
}

@keyframes neonPulse {
    0%, 100% {
        text-shadow: 0 0 8px currentColor, 0 0 15px currentColor, 0 0 20px currentColor;
    }
    50% {
        text-shadow: 0 0 12px currentColor, 0 0 25px currentColor, 0 0 30px currentColor, 0 0 40px rgba(currentColor, 0.7);
    }
}

/* 抖动效果 */
@keyframes glitch {
    0%, 100% {
        transform: translate(0, 0);
    }
    20% {
        transform: translate(-1px, 1px);
    }
    40% {
        transform: translate(1px, -1px);
    }
    60% {
        transform: translate(-1px, -1px);
    }
    80% {
        transform: translate(1px, 1px);
    }
}

/* 放大缩小循环动画 */
@keyframes pulseScale {
    0%, 100% {
        transform: translateX(5px) translateY(-2px) scale(1);
    }
    50% {
        transform: translateX(5px) translateY(-2px) scale(1.03);
    }
}

/* 扫描线动画 */
@keyframes scanline {
    0% {
        background-position: 0 -100vh;
    }
    100% {
        background-position: 0 100vh;
    }
}

/* 漂浮动画 */
@keyframes float {
    0%, 100% {
        transform: translateX(5px) translateY(-2px);
    }
    50% {
        transform: translateX(5px) translateY(2px);
    }
}

/* 轻微漂浮动画 */
@keyframes subtleFloat {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-3px);
    }
}

/* 未讲解项警示脉冲动画 */
@keyframes warningPulse {
    0%, 100% {
        box-shadow: 0 0 8px rgba(255, 58, 58, 0.3), 0 0 15px rgba(255, 58, 58, 0.2);
    }
    50% {
        box-shadow: 0 0 12px rgba(255, 58, 58, 0.5), 0 0 25px rgba(255, 58, 58, 0.4);
    }
}




        /* 动画效果 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .subcategory-content {
            animation: fadeIn 0.8s ease-out;
        }

        /* 霓虹边缘动画 */
        @keyframes neonPulse {
            0%, 100% { box-shadow: 0 0 5px rgba(0, 240, 255, 0.5); }
            50% { box-shadow: 0 0 15px rgba(0, 240, 255, 0.8); }
        }

        .navbar, .category-card, .subcategory-content {
            animation: neonPulse 3s infinite;
        }

        /* 响应式设计 */
        @media (max-width: 1024px) {
            .category-grid {
                grid-template-columns: repeat(auto-fit, minmax(calc(20% - 1.5rem), 1fr));
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                position: fixed;
                top: 70px;
                right: -100%;
                flex-direction: column;
                background: var(--base-gray);
                width: 50%;
                height: calc(100vh - 70px);
                padding: 2rem;
                transition: right 0.3s ease;
                z-index: 99;
                border-left: 1px solid var(--accent-blue);
                box-shadow: -5px 0 15px rgba(0, 0, 0, 0.5);
            }

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

            .hamburger {
                display: block;
            }

            .category-grid {
                grid-template-columns: repeat(auto-fit, minmax(calc(50% - 1rem), 1fr));
            }

            .page-title {
                font-size: 2rem;
            }
        }

        @media (max-width: 480px) {
            .category-grid {
                grid-template-columns: 1fr;
            }

            .nav-links {
                width: 100%;
                right: -100%;
            }
        }
        /* 底部状态栏 - 赛博朋克风格强化 */
        .footer {
            /* 1. 半透明背景（保留原深色基调，降低不透明度实现通透感） */
            background: rgba(40, 40, 44, 0.8); /* 替换原 var(--base-darkgray)，建议用 rgba 控制透明 */
            /* 2. 保留原有的细线条纹理（不影响磨砂效果，增加细节层次） */
            background-image: linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
            background-size: 10px 10px;
            /* 3. 磨砂核心属性：backdrop-filter（模糊背景内容，实现毛玻璃效果） */
            backdrop-filter: blur(5px); /* 模糊强度，8-12px 效果最自然，数值越大越模糊 */
            -webkit-backdrop-filter: blur(5px); /* 兼容 Safari/Chrome 等 WebKit 内核浏览器 */
            /* 4. 保留原有布局与样式（边框、内边距、定位等不变） */
            padding: 1rem 2rem;
            border-top: 1px solid rgba(0, 191, 255, 0.5); /* 边框也加半透明，更贴合磨砂质感 */
            margin-top: 3rem;
            position: relative;
            z-index: 10;
        }

/* 背景滚动动画 */
@keyframes bgScroll {
  0% { background-position: 0 0, 0 0, 0 0; }
  100% { background-position: 200px 0, 400px 0, 100px 0; }
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  background-color: transparent
}

/* 角落霓虹装饰线条 */
.footer::before,
.footer::after {
  content: '';
  position: absolute;
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, #00f0ff);
  bottom: 10px;
  background-color: transparent
}

.footer::before {
  left: 2rem;
  box-shadow: 0 0 10px #00f0ff, 0 0 20px rgba(0, 240, 255, 0.5);
  background-color: transparent
}

.footer::after {
  right: 2rem;
  background: linear-gradient(90deg, #ff00f0, transparent);
  box-shadow: 0 0 10px #ff00f0, 0 0 20px rgba(255, 0, 240, 0.5);
  background-color: transparent
}

/* 赛博朋克风格返回顶部按钮 */
.back-to-top {
  /* 霓虹渐变文字 */
  color: #00f0ff;
  text-shadow: 0 0 5px #00f0ff, 0 0 10px #00f0ff;
  text-decoration: none;
  padding: 0.6rem 1.2rem;
  font-family: 'Orbitron', sans-serif; /* 赛博朋克常用科技字体 */
  font-size: 0.9rem;
  letter-spacing: 1px;
  border: 1px solid;
  border-image: linear-gradient(45deg, #00f0ff, #ff00f0) 1;
  border-radius: 2px; /* 棱角更锐利 */
  background: rgba(10, 10, 15, 0.8);
  /* 基础发光 */
  box-shadow: 0 0 5px #00f0ff, inset 0 0 5px rgba(0, 240, 255, 0.2);
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
  overflow: hidden;
}

/* 按钮内部发光条纹 */
.back-to-top::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    to right,
    transparent,
    rgba(0, 240, 255, 0.1),
    transparent
  );
  transform: rotate(30deg);
  animation: shine 3s infinite;
}

@keyframes shine {
  0% { transform: rotate(30deg) translateX(-100%); }
  100% { transform: rotate(30deg) translateX(100%); }
}

/* 按钮悬停强化效果 */
.back-to-top:hover {
  color: #ff00f0;
  text-shadow: 0 0 5px #ff00f0, 0 0 15px #ff00f0, 0 0 20px #ff00f0;
  background: rgba(30, 5, 30, 0.8);
  /* 强烈发光扩散 */
  box-shadow: 0 0 10px #ff00f0, 0 0 20px rgba(255, 0, 240, 0.5), 
              inset 0 0 8px rgba(255, 0, 240, 0.3);
  transform: translateY(-3px) scale(1.02);
  border-image: linear-gradient(45deg, #ff00f0, #00f0ff) 1;
}

/* 底部额外霓虹装饰条 */
.footer::after {
  /* 底部边缘发光条 */
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, 
    transparent, 
    #00f0ff 20%, 
    #ff00f0 50%, 
    #00f0ff 80%, 
    transparent
  );
  box-shadow: 0 0 10px #00f0ff, 0 0 20px rgba(0, 240, 255, 0.3);
  animation: glowShift 8s ease-in-out infinite;
  background-color: transparent
}

@keyframes glowShift {
  0%, 100% { background-position: 0 0; }
  50% { background-position: 100% 0; }
}

        /* 滚动动画 */
        .fade-in {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }

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

/* 首页 */
        /* 基础重置与变量定义 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        :root {
            --base-black: #0A0A0A;
            --base-darkgray: #1A1A1A;
            --neon-blue: #00F0FF;
            --neon-pink: #FF00F0;
            --neon-purple: #9D00FF;
            --acrylic-bg: rgba(34, 34, 34, 0.6);
            --text-color: rgba(255, 255, 255, 0.8);
            --grid-color: #333333;
        }

        /* body {
            background-color: var(--base-black);
            background-image: 
                linear-gradient(rgba(51, 51, 51, 0.1) 1px, transparent 1px),
                linear-gradient(90deg, rgba(51, 51, 51, 0.1) 1px, transparent 1px);
            background-size: 20px 20px;
            color: var(--text-color);
            min-height: 100vh;
            position: relative;
            overflow-x: hidden;
        } */

        /* 网格点动画 */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 0;
        }

        /* 悬浮金属片装饰 */
        .floating-shape {
            position: fixed;
            background: var(--base-darkgray);
            opacity: 0.7;
            pointer-events: none;
            z-index: 0;
            border: 1px solid var(--neon-blue);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
            animation: float 15s infinite ease-in-out, glitch 10s infinite;
        }

        .triangle {
            width: 0;
            height: 0;
            border-left: 30px solid transparent;
            border-right: 30px solid transparent;
            border-bottom: 50px solid var(--base-darkgray);
        }

        .hexagon {
            width: 40px;
            height: 23px;
            position: relative;
        }

        .hexagon::before {
            content: "";
            position: absolute;
            top: -11px;
            left: 0;
            width: 0;
            height: 0;
            border-left: 20px solid transparent;
            border-right: 20px solid transparent;
            border-bottom: 11px solid var(--base-darkgray);
        }

        .hexagon::after {
            content: "";
            position: absolute;
            bottom: -11px;
            left: 0;
            width: 0;
            height: 0;
            border-left: 20px solid transparent;
            border-right: 20px solid transparent;
            border-top: 11px solid var(--base-darkgray);
        }

        /* /* 导航栏 - 磨砂金属风格 */
        /* 导航栏 - 磨砂金属效果（新增磨砂半透明） */
        .navbar {
            /* 1. 半透明背景：将纯色改为 rgba，最后一位 0.7 是透明度（0-1 可调） */
            background-color: rgba(4, 4, 4, 0); /* 替换原 var(--base-gray)，也可定义为变量：--base-gray: rgba(40,40,40,0.7) */
            /* 保留原有网格纹理，透明度 0.03 已很淡，不影响磨砂 */
            background-image: linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
            background-size: 20px 100%;

            /* 2. 磨砂核心：blur(8px) 是模糊半径，数值越大磨砂越明显 */
            backdrop-filter: blur(5px); 
            -webkit-backdrop-filter: blur(5px); /* 兼容 Safari 浏览器 */

            /* 保留原有边框、阴影、定位等样式 */
            border-bottom: 1px solid var(--accent-blue);
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
            position: sticky;
            top: 0;
            z-index: 100;
            padding: 1rem 5%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: all 0.3s ease;
            overflow: hidden;
        }

        .navbar::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 50%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.1), transparent);
            transition: 0.5s;
            animation: navbar-glow 8s infinite;
        }

        .navbar::after {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 30px;
            height: 100%;
            animation: glitch-effect 0.5s infinite;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: bold;
            color: white;
            text-shadow: 0 0 5px var(--neon-pink), 0 0 10px var(--neon-pink);
            position: relative;
            animation: text-glitch 5s infinite;
        }

        .nav-links {
            display: flex;
            gap: 1.5rem;
        }

        .nav-link {
            color: var(--text-color);
            text-decoration: none;
            padding: 0.5rem;
            position: relative;
            transition: all 0.3s;
            background: var(--base-darkgray);
            border: 1px solid transparent;
            border-radius: 4px;
            background-color: transparent;
        }

        .nav-link:hover {
            color: white;
            border-color: var(--neon-blue);
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 1px;
            background: linear-gradient(90deg, var(--neon-blue), var(--neon-pink));
            transition: width 0.3s;
        } */

        .nav-link:hover::after {
            width: 100%;
        }

        .hamburger {
            display: none;
            color: var(--neon-blue);
            font-size: 1.5rem;
            cursor: pointer;
            text-shadow: 0 0 5px var(--neon-blue);
        }

        /* 主内容区 - 亚克力风格 */
        .main-content {
            max-width: 100%;
            margin: 2rem auto;
            padding: 0 1rem;
            position: relative;
            z-index: 10;
        }

        .announcement {
            background: var(--acrylic-bg);
            backdrop-filter: blur(5px);
            border-radius: 8px;
            padding: 2rem;
            margin: 2rem 0;
            border: 1px solid var(--neon-blue);
            position: relative;
            overflow: hidden;
            transition: all 0.3s;
        }

        .announcement:hover {
            transform: translateY(-5px);
            border-color: var(--neon-pink);
            box-shadow: 0 0 20px rgba(157, 0, 255, 0.5);
        }

        .announcement::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, var(--neon-blue), var(--neon-pink));
        }

        .announcement::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, var(--neon-pink), var(--neon-blue));
        }

        .announcement-title {
            color: white;
            font-size: 1.8rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            text-shadow: 0 0 5px var(--neon-blue);
            position: relative;
        }

        .announcement-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            height: 1px;
            width: 60px;
            background: var(--neon-pink);
        }

        .section-title {
            color: white;
            font-size: 1.4rem;
            margin-bottom: 1rem;
            text-shadow: 0 0 5px var(--neon-pink);
        }

        .announcement-content p {
            margin-bottom: 1rem;
            line-height: 1.8;
            position: relative;
            padding-left: 1.5rem;
        }

        .announcement-content p::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0.5rem;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--neon-blue);
            box-shadow: 0 0 5px var(--neon-blue);
        }

        .announcement-content a {
            color: var(--neon-blue);
            text-decoration: none;
            position: relative;
            transition: all 0.3s;
        }

        .announcement-content a:hover {
            color: var(--neon-pink);
            text-shadow: 0 0 5px var(--neon-pink);
        }

        .announcement-content a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 1px;
            background: var(--neon-blue);
            transition: all 0.3s;
        }

        .announcement-content a:hover::after {
            background: var(--neon-pink);
            height: 2px;
        }

        /* 底部状态栏 */
        /* .footer {
            background: var(--base-darkgray);
            background-image: linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
            background-size: 10px 10px;
            padding: 1rem 2rem;
            border-top: 1px solid var(--neon-blue);
            margin-top: 3rem;
            position: relative;
            z-index: 10;*/
            /* background-color: transparent */
        /* }  */
        .footer {
            /* 1. 半透明背景（保留原深色基调，降低不透明度实现通透感） */
            background: rgba(40, 40, 44, 0.8); /* 替换原 var(--base-darkgray)，建议用 rgba 控制透明 */
            /* 2. 保留原有的细线条纹理（不影响磨砂效果，增加细节层次） */
            background-image: linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
            background-size: 10px 10px;
            /* 3. 磨砂核心属性：backdrop-filter（模糊背景内容，实现毛玻璃效果） */
            backdrop-filter: blur(5px); /* 模糊强度，8-12px 效果最自然，数值越大越模糊 */
            -webkit-backdrop-filter: blur(5px); /* 兼容 Safari/Chrome 等 WebKit 内核浏览器 */
            /* 4. 保留原有布局与样式（边框、内边距、定位等不变） */
            padding: 1rem 2rem;
            border-top: 1px solid rgba(0, 191, 255, 0.5); /* 边框也加半透明，更贴合磨砂质感 */
            margin-top: 3rem;
            position: relative;
            z-index: 10;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            /* background-color: transparent */
        }

        .back-to-top {
            color: var(--neon-blue);
            text-decoration: none;
            padding: 0.5rem 1rem;
            border: 1px solid var(--neon-blue);
            border-radius: 4px;
            transition: all 0.3s;
            background: rgba(0, 240, 255, 0.05);
        }

        .back-to-top:hover {
            background: rgba(0, 240, 255, 0.1);
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
            transform: translateY(-2px);
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .nav-links {
                position: fixed;
                top: 70px;
                right: -100%;
                flex-direction: column;
                background: var(--base-darkgray);
                width: 50%;
                height: calc(100vh - 70px);
                padding: 2rem;
                transition: right 0.3s;
                border-left: 1px solid var(--neon-blue);
                z-index: 100;
            }

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

            .hamburger {
                display: block;
            }
        }

        /* 动画效果 */
        @keyframes navbar-glow {
            0% { left: -100%; }
            20% { left: 100%; }
            100% { left: 100%; }
        }

        @keyframes glitch-effect {
            0%, 100% { transform: translateX(0); }
            50% { transform: translateX(-2px); }
        }

        @keyframes text-glitch {
            0%, 100% { transform: translateX(0); }
            90% { transform: translateX(0); }
            92% { transform: translateX(-2px); }
            94% { transform: translateX(2px); }
            96% { transform: translateX(-1px); }
            98% { transform: translateX(1px); }
        }

        @keyframes float {
            0%, 100% { transform: translateY(0) rotate(0deg); }
            50% { transform: translateY(-20px) rotate(5deg); }
        }

        @keyframes glitch {
            0%, 100% { opacity: 0.7; }
            5% { opacity: 0; }
            6% { opacity: 0.7; }
            10% { opacity: 0.4; }
            11% { opacity: 0.7; }
        }

        @keyframes neon-pulse {
            0%, 100% { box-shadow: 0 0 5px var(--neon-blue); }
            50% { box-shadow: 0 0 15px var(--neon-blue); }
        }

        /* 为霓虹边框添加闪烁效果 */
        .navbar, .announcement, .footer {
            animation: neon-pulse 3s infinite;
            /* background-color: transparent */
        }

        /* 滚动动画 */
        .fade-in {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }

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