index.html

<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  <title>青少年CTF文库</title>
  <meta name="description" content="适合你快速入门的CTF百科全书" />
  <link rel="icon" href="/assets/logo.png">
  <link rel="preconnect" href="https://fonts.googleapis.com">
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap" rel="stylesheet">

  <style>
    /* --- 核心变量 --- */
    :root {
      --primary-text: #1f2937;
      --secondary-text: #6b7280;
      --accent-color: #0066ff;
      --accent-hover: #0052cc;
      --glass-bg: rgba(255, 255, 255, 0.65); /* 卡片半透明白 */
      --glass-border: rgba(255, 255, 255, 0.8);
      --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    }

    body, html {
      margin: 0; padding: 0;
      font-family: 'Inter', sans-serif;
      color: var(--primary-text);
      line-height: 1.6;
      width: 100%;
      overflow-x: hidden;
      /* 这是一个 fallback 背景，如果 canvas 加载失败 */
      /* background-color: #f9fafb;  */
    }

    a { text-decoration: none; color: var(--accent-color); transition: 0.2s; }
    a:hover { color: var(--accent-hover); }

    /* --- 层级 1: 静态网格背景 (CSS 实现) --- */
    .bg-grid {
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      z-index: -2;
      background-image: 
        linear-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
      background-size: 40px 40px; /* 网格大小 */
      background-color: #ffffff; /* 底色纯白 */
    }

    /* --- 层级 2: 动态粒子画布 --- */
    #canvas-particles {
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      z-index: -1;
    }

    /* --- 层级 3: 内容区域 --- */
    .content-wrapper {
      position: relative;
      z-index: 1;
    }

    /* --- Hero Section --- */
    .hero {
      padding: 140px 20px 80px;
      text-align: center;
    }

    .hero h1 {
      font-size: 3.5rem;
      font-weight: 800;
      margin: 0 0 20px;
      color: #111827;
      letter-spacing: -0.03em;
    }

    /* 渐变标题 */
    .title-gradient {
      background: linear-gradient(135deg, #111827 0%, var(--accent-color) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero p {
      max-width: 650px;
      margin: 0 auto;
      font-size: 1.25rem;
      color: var(--secondary-text);
    }

    /* 按钮组 */
    .btn-group {
      margin-top: 40px;
      display: flex;
      justify-content: center;
      gap: 15px;
      flex-wrap: wrap;
    }

    .btn {
      padding: 12px 32px;
      border-radius: 50px;
      font-weight: 600;
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
      border: 2px solid transparent;
      position: relative;
      overflow: hidden;
      z-index: 10;
    }

    .btn-primary {
      background: var(--accent-color);
      color: #fff;
      box-shadow: 0 4px 15px rgba(0, 102, 255, 0.3);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 102, 255, 0.4);
      color: #fff;
    }

    .btn-outline {
      background: rgba(255, 255, 255, 0.5); /* 半透明背景 */
      backdrop-filter: blur(4px);
      color: var(--accent-color);
      border-color: rgba(0, 102, 255, 0.3);
    }
    .btn-outline:hover {
      background: var(--accent-color);
      color: #fff;
      border-color: var(--accent-color);
      transform: translateY(-2px);
    }

    /* --- Features Section (Glassmorphism) --- */
    .features-container {
      padding: 60px 20px 100px;
    }

    .features {
      max-width: 1200px;
      margin: 0 auto;
      display: grid;
      /* 强制 4 列 */
      grid-template-columns: repeat(4, 1fr);
      gap: 25px;
    }

    .feature {
      /* 毛玻璃核心代码 */
      background: var(--glass-bg);
      backdrop-filter: blur(12px); 
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      
      padding: 30px;
      border-radius: 20px;
      box-shadow: var(--card-shadow);
      transition: all 0.4s ease;
      text-align: left;
    }

    .feature:hover {
      transform: translateY(-8px);
      background: rgba(255, 255, 255, 0.85); /* 悬停时更白一点，增加可读性 */
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
      border-color: var(--accent-color);
    }

    .feature h3 {
      margin: 0 0 10px;
      font-size: 1.25rem;
      font-weight: 700;
      color: #111827;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    /* 标题下的装饰短线 */
    .feature h3::after {
      content: '';
      display: block;
      width: 0;
      height: 3px;
      background: var(--accent-color);
      transition: width 0.3s;
      border-radius: 2px;
    }
    header {
      padding: 16px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }
    header .nav-links a {
      margin-right: 16px;
      color: #0066ff;
      text-decoration: none;
      font-weight: 500;
    }
    
    

    .feature p {
      color: var(--secondary-text);
      font-size: 0.95rem;
      margin: 0;
    }

    /* --- Footer --- */
    footer {
      text-align: center;
      padding: 40px;
      font-size: 0.9rem;
      color: #888;
      /* 确保 footer 也是半透明的，与环境融合 */
      background: linear-gradient(to top, #ffffff 0%, rgba(255,255,255,0) 100%);
    }

    footer a { color: #555; font-weight: 600; margin: 0 8px;}
    footer a:hover { color: var(--accent-color); }

    /* --- 响应式 --- */
    @media (max-width: 1024px) {
      .features { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .hero h1 { font-size: 2.5rem; }
      .features { grid-template-columns: 1fr; }
      .btn { width: 100%; box-sizing: border-box; }
    }
  </style>
</head>
<body>
<header>
    <div class="logo"><strong>青少年CTF文库</strong></div>
    <div class="nav-links">
      <a href="/home/">开始学习</a>
      <a href="https://www.qsnctf.com" target="_blank">练习平台</a>
      <a href="https://tools.qsnctf.com" target="_blank">在线工具</a>
      <a href="https://bbs.qsnctf.com" target="_blank">社区论坛</a>
      <a href="https://github.com/qsnctf" target="_blank">GitHub</a>
    </div>
  </header>
  <div class="bg-grid"></div>

  <canvas id="canvas-particles"></canvas>

  <div class="content-wrapper">
    
    <div class="hero">
      <h1><span class="title-gradient">青少年CTF文库</span></h1>
      <p>适合你快速入门的 CTF 百科全书，让网安学习之旅清晰、高效、专业。</p>

      <div class="btn-group">
        <a class="btn btn-primary" href="/home/">📘 开始学习</a>
        <a class="btn btn-outline" href="https://www.qsnctf.com" target="_blank">⚔️ 练习平台</a>
        <a class="btn btn-outline" href="https://tools.qsnctf.com" target="_blank">🛠️ 在线工具</a>
        <a class="btn btn-outline" href="https://bbs.qsnctf.com" target="_blank">💬 社区论坛</a>
      </div>
    </div>

    <div class="features-container">
      <div class="features">
        <div class="feature">
          <h3>全面知识体系</h3>
          <p>覆盖 Web、逆向、密码、Pwn、杂项等方向，从基础到进阶，构建完整技能树。</p>
        </div>

        <div class="feature">
          <h3>实战题解与教程</h3>
          <p>精选高质量题目与深度解析，拒绝死记硬背，注重逻辑复现与思路启发。</p>
        </div>

        <div class="feature">
          <h3>CTF 训练生态</h3>
          <p>无缝衔接练习平台、在线工具与社区讨论，打造学、练、赛一体化的成长闭环。</p>
        </div>

        <div class="feature">
          <h3>社区驱动协作</h3>
          <p>与全国各地的 CTF 爱好者一起讨论、组队、切磋，在交流中共同进步。</p>
        </div>
      </div>
    </div>

    <footer>
      © 2025 青少年CTF文库 | 社区驱动 
      <br><br>
      加入我们：
      <a href="https://qm.qq.com/q/wX8VEyRq6I" target="_blank">QQ群</a> ·
      <a href="https://space.bilibili.com/2066710972" target="_blank">Bilibili</a>
    </footer>

  </div>

  <script>
    /* 动态粒子脚本 (Light Mode)
      特点：浅灰色粒子，鼠标互动时连线变蓝
    */
    const canvas = document.getElementById('canvas-particles');
    const ctx = canvas.getContext('2d');

    let w, h;
    let particles = [];
    
    // 配置
    const config = {
      count: 80, // 粒子数量
      radius: 2,
      distance: 120, // 连线距离
      mouseDist: 150, // 鼠标互动距离
      color: 'rgba(31, 41, 55, 0.15)', // 粒子颜色 (深灰，低透明度)
      lineColor: 'rgba(0, 102, 255, 0.05)', // 普通连线颜色
      activeColor: 'rgba(0, 102, 255, 0.2)' // 激活连线颜色 (蓝色)
    };

    const mouse = { x: null, y: null };

    // 监听窗口大小和鼠标
    window.addEventListener('resize', init);
    window.addEventListener('mousemove', e => {
      mouse.x = e.x;
      mouse.y = e.y;
    });
    // 鼠标移出窗口时清除坐标
    window.addEventListener('mouseout', () => {
      mouse.x = null;
      mouse.y = null;
    });

    function init() {
      w = canvas.width = window.innerWidth;
      h = canvas.height = window.innerHeight;
      createParticles();
    }

    class Particle {
      constructor() {
        this.x = Math.random() * w;
        this.y = Math.random() * h;
        // 速度稍慢一点，保持优雅
        this.vx = (Math.random() - 0.5) * 0.8;
        this.vy = (Math.random() - 0.5) * 0.8;
      }

      update() {
        this.x += this.vx;
        this.y += this.vy;

        // 边界反弹
        if(this.x < 0 || this.x > w) this.vx *= -1;
        if(this.y < 0 || this.y > h) this.vy *= -1;
      }

      draw() {
        ctx.beginPath();
        ctx.arc(this.x, this.y, config.radius, 0, Math.PI * 2);
        ctx.fillStyle = config.color;
        ctx.fill();
      }
    }

    function createParticles() {
      particles = [];
      let count = window.innerWidth < 768 ? 40 : config.count;
      for(let i=0; i<count; i++) particles.push(new Particle());
    }

    function animate() {
      ctx.clearRect(0, 0, w, h);

      for (let i = 0; i < particles.length; i++) {
        let p1 = particles[i];
        p1.update();
        p1.draw();

        // 粒子间连线
        for (let j = i; j < particles.length; j++) {
          let p2 = particles[j];
          let dx = p1.x - p2.x;
          let dy = p1.y - p2.y;
          let dist = Math.sqrt(dx*dx + dy*dy);

          if (dist < config.distance) {
            ctx.beginPath();
            ctx.strokeStyle = config.lineColor;
            ctx.lineWidth = 1;
            ctx.moveTo(p1.x, p1.y);
            ctx.lineTo(p2.x, p2.y);
            ctx.stroke();
          }
        }

        // 鼠标连线互动
        if (mouse.x) {
          let dx = mouse.x - p1.x;
          let dy = mouse.y - p1.y;
          let dist = Math.sqrt(dx*dx + dy*dy);

          if (dist < config.mouseDist) {
            ctx.beginPath();
            // 距离越近，线条越明显
            ctx.strokeStyle = config.activeColor; 
            ctx.lineWidth = 1.5;
            ctx.moveTo(p1.x, p1.y);
            ctx.lineTo(mouse.x, mouse.y);
            ctx.stroke();
          }
        }
      }
      requestAnimationFrame(animate);
    }

    // 启动
    init();
    animate();
  </script>
</body>
</html>