* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: "Segoe UI", Roboto, sans-serif;
      background: #0b1020;
      color: #fff;
      overflow-x: hidden;
    }

    /* 粒子背景容器 */
    #particles {
      position: fixed;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      z-index: -1;
    }

    /* 导航 */
    nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.2rem 5%;
      background: rgba(15,23,42,0.85);
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 999;
      backdrop-filter: blur(10px);
      transition: 0.3s;
    }

    nav.sticky {
      padding: 0.8rem 5%;
      background: rgba(12, 19, 36, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }

    .logo {
      font-size: 1.5rem;
      font-weight: bold;
      color: #38bdf8;
    }

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

    .nav-links a {
      color: #e2e8f0;
      text-decoration: none;
      transition: 0.3s;
    }

    .nav-links a:hover {
      color: #38bdf8;
    }

    /* 移动端菜单按钮 */
    .menu-btn {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: #fff;
      background: none;
      border: none;
    }

    /* 首屏 */
    .hero {
      height: 100vh;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 0 5%;
      position: relative;
      z-index: 1;
    }

    .hero h1 {
      font-size: clamp(2rem, 5vw, 3.4rem);
      max-width: 700px;
      line-height: 1.2;
      margin-bottom: 1.2rem;
    }

    .hero p {
      font-size: 1.1rem;
      color: #94a3b8;
      max-width: 550px;
      margin-bottom: 2rem;
    }

    .btn {
      padding: 0.9rem 2rem;
      background: #38bdf8;
      color: #0f172a;
      border: none;
      border-radius: 6px;
      font-weight: 600;
      cursor: pointer;
      transition: 0.3s;
      width: fit-content;
    }

    .btn:hover {
      background: #0ea5e9;
    }

    /* 模块通用 */
    .section-title {
      font-size: 2.2rem;
      text-align: center;
      margin-bottom: 3rem;
    }

    .features, .products, .contact, .faq {
      padding: 6rem 5%;
      position: relative;
      z-index: 1;
    }

    .feature-box {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 2rem;
    }

    .card {
      background: rgba(30, 41, 59, 0.7);
      padding: 2rem;
      border-radius: 12px;
      transition: 0.3s;
      backdrop-filter: blur(4px);
	  /* position: relative; */
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: 0 10px 30px rgba(56,189,248,0.15);
    }

    .card h3 {
      color: #38bdf8;
      margin: 1rem 0;
    }

    .card p {
      color: #94a3b8;
      font-size: 0.95rem;
    }

    .products {
      background: rgba(15, 23, 42, 0.5);
    }
	
	/* .feature-box .card-btn{
		position: relative;
		bottom: 20px;
	} */
	
	/* 产品介绍卡片 */
	.card-tag {
	    display: inline-block;
	    padding: 4px 10px;
	    background: #e8f3ff;
	    color: #1677ff;
	    font-size: 12px;
	    border-radius: 20px;
	    margin-bottom: 20px;
	}
	.card-btn {
		display: block;
	    width: 50%;
	    height: 40px;
	    line-height: 40px;
	    background: #1677ff;
	    color: #fff;
	    border-radius: 8px;
	    font-size: 14px;
	    border: none;
	    cursor: pointer;
	    transition: 0.2s;
		margin: 30px auto 0;
		text-decoration: none;
		text-align: center;
	}
	.card-btn:hover {
	    background: #005ed0;
	}

    /* 联系我们 */
    .contact {
      background: rgba(15,23,42,0.4);
    }
    .contact-box {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px,1fr));
      gap: 2.5rem;
      align-items: center;
      text-align: center;
    }
    .contact-item img {
      width: 160px;
      height: 160px;
      border-radius: 8px;
      margin-bottom: 1rem;
      border: 2px solid #38bdf8;
    }
    .contact-item p {
      color: #ccc;
      margin-top: 0.5rem;
    }

    /* FAQ 常见问题 */
    .faq {
      background: #0b1020;
    }
    .faq-item {
      max-width: 800px;
      margin: 0 auto 1.2rem auto;
      background: rgba(30,41,59,0.6);
      padding: 1.2rem 1.5rem;
      border-radius: 10px;
      cursor: pointer;
      transition: 0.3s;
    }
    .faq-item:hover {
      background: rgba(40,51,71,0.6);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1rem;
      font-weight: 500;
      color:#fff;
    }
    .faq-answer {
      margin-top: 0.8rem;
      color: #94a3b8;
      display: none;
    }
    .faq-answer.show {
      display: block;
    }

    /* 页脚 */
    footer {
      padding: 3rem 5%;
      background: #0b1020;
      text-align: center;
      color: #64748b;
      position: relative;
      z-index: 1;
    }
	footer a{
		color: #ccc;
		font-size: 14px;
	}

    /* 动画 */
    .fade {
      opacity: 0;
      transform: translateY(30px);
      transition: 0.8s ease;
    }
    .fade.show {
      opacity: 1;
      transform: translateY(0);
    }

    /* 移动端适配 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        right: 0;
        top: 60px;
        background: rgba(15,23,42,0.8);
        flex-direction: column;
        width: 100%;
        padding: 2rem;
        gap: 1.5rem;
        transform: translateX(100%);
        transition: 0.3s;
        border-radius: 0 0 0 12px;
      }
      .nav-links.active {
        transform: translateX(0);
      }
      .menu-btn {
        display: block;
      }
    }