Test

Test: iframe srcdoc rendering

<div style="width:800px;height:600px;margin:0 auto;background:linear-gradient(135deg,#0f2027,#203a43,#2c5364);display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;overflow:hidden;font-family:'Microsoft YaHei',sans-serif;">
  <div style="position:absolute;top:-80px;left:-80px;width:260px;height:260px;border-radius:50%;background:rgba(255,165,0,0.08);"></div>
  <div style="position:absolute;bottom:-60px;right:-60px;width:220px;height:220px;border-radius:50%;background:rgba(0,200,150,0.08);"></div>
  <div style="position:absolute;top:40px;right:60px;width:100px;height:100px;border:3px solid rgba(255,255,255,0.06);border-radius:50%;"></div>
  <div style="position:absolute;bottom:60px;left:50px;width:60px;height:60px;border:2px solid rgba(255,255,255,0.05);border-radius:50%;"></div>
  <div style="position:relative;z-index:2;text-align:center;">
    <div style="display:inline-block;background:linear-gradient(135deg,#ff6b35,#f7931e);padding:8px 32px;border-radius:30px;margin-bottom:20px;">
      <span style="color:#fff;font-size:15px;font-weight:bold;letter-spacing:4px;">初一数学</span>
    </div>
    <h1 style="font-size:52px;color:#ffffff;margin:0 0 12px 0;letter-spacing:6px;text-shadow:0 4px 20px rgba(0,0,0,0.3);">一元一次方程</h1>
    <div style="width:80px;height:3px;background:linear-gradient(90deg,#ff6b35,#00c896);margin:0 auto 20px auto;border-radius:2px;"></div>
    <p style="color:rgba(255,255,255,0.7);font-size:18px;margin:0 0 30px 0;letter-spacing:2px;">从生活问题到代数思维的桥梁</p>
    <div style="display:flex;gap:20px;justify-content:center;">
      <div style="background:rgba(255,255,255,0.08);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,0.1);border-radius:16px;padding:20px 24px;text-align:center;width:160px;">
        <div style="font-size:36px;margin-bottom:8px;">📖</div>
        <div style="color:#fff;font-size:14px;font-weight:bold;">定义与性质</div>
        <div style="color:rgba(255,255,255,0.5);font-size:12px;margin-top:4px;">概念理解</div>
      </div>
      <div style="background:rgba(255,255,255,0.08);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,0.1);border-radius:16px;padding:20px 24px;text-align:center;width:160px;">
        <div style="font-size:36px;margin-bottom:8px;">✏️</div>
        <div style="color:#fff;font-size:14px;font-weight:bold;">解题步骤</div>
        <div style="color:rgba(255,255,255,0.5);font-size:12px;margin-top:4px;">方法掌握</div>
      </div>
      <div style="background:rgba(255,255,255,0.08);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,0.1);border-radius:16px;padding:20px 24px;text-align:center;width:160px;">
        <div style="font-size:36px;margin-bottom:8px;">🎯</div>
        <div style="color:#fff;font-size:14px;font-weight:bold;">实战练习</div>
        <div style="color:rgba(255,255,255,0.5);font-size:12px;margin-top:4px;">巩固提升</div>
      </div>
    </div>
  </div>
  <div style="position:absolute;bottom:20px;color:rgba(255,255,255,0.3);font-size:12px;letter-spacing:1px;">点击下方箭头开始学习 →</div>
</div>