/* roulang page: index */
:root {
      --deep-space: #0B0A1A;
      --nebula-purple: #7B2FBE;
      --cyan-electric: #00E5FF;
      --card-bg: rgba(26, 26, 46, 0.8);
      --card-border: rgba(123, 47, 190, 0.3);
      --gray-light: #F0F0F5;
      --white: #FFFFFF;
      --text-body: #CCCCDD;
      --text-muted: #8888AA;
      --radius-card: 16px;
      --radius-btn: 50px;
      --transition-base: 0.3s ease;
      --container-max: 1280px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
      background-color: var(--deep-space);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航混合模糊效果 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 10, 26, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.25);
      z-index: 999;
      transition: var(--transition-base);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--white);
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--nebula-purple), var(--cyan-electric));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-body);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 6px 0;
      transition: color 0.3s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyan-electric);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: linear-gradient(to right, var(--nebula-purple), var(--cyan-electric));
      transition: width 0.3s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--white);
      transition: 0.3s;
      border-radius: 2px;
    }

    @media (max-width: 1024px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(11, 10, 26, 0.96);
        backdrop-filter: blur(25px);
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        border-bottom: 1px solid var(--card-border);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero Dynamics */
    .hero {
      position: relative;
      min-height: 90vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      background: radial-gradient(circle at 30% 50%, rgba(123,47,190,0.3) 0%, rgba(11,10,26,0.95) 80%);
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
    }
    .hero-content {
      position: relative;
      max-width: 880px;
      padding: 0 24px;
    }
    .hero h1 {
      font-size: clamp(36px, 7vw, 48px);
      font-weight: 800;
      color: var(--white);
      margin-bottom: 1rem;
      letter-spacing: -0.5px;
    }
    .hero .accent-line {
      width: 80px;
      height: 3px;
      background: linear-gradient(to right, var(--cyan-electric), var(--nebula-purple));
      margin: 1.5rem auto;
    }
    .hero p {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      gap: 1.5rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--nebula-purple), var(--cyan-electric));
      color: white;
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition-base);
      text-decoration: none;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 0 25px rgba(0,229,255,0.5);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--cyan-electric);
      color: var(--cyan-electric);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-base);
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.1);
      border-color: var(--white);
      color: var(--white);
    }

    .section {
      padding: 100px 0 120px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 3rem;
      text-align: center;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition-base);
    }
    .feature-card:hover {
      transform: translateY(-5px);
      border-color: var(--cyan-electric);
      box-shadow: 0 0 30px rgba(0,229,255,0.2);
    }
    .card-icon {
      font-size: 2.4rem;
      color: var(--cyan-electric);
      margin-bottom: 1rem;
    }
    .service-block {
      display: flex;
      gap: 32px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      margin-bottom: 32px;
      border: 1px solid var(--card-border);
      align-items: center;
      flex-wrap: wrap;
    }
    .faq-item {
      background: var(--card-bg);
      border-radius: 12px;
      margin-bottom: 16px;
      padding: 20px;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: white;
    }
    .faq-answer {
      margin-top: 12px;
      color: var(--text-body);
      display: none;
    }
    .footer {
      background: #070617;
      padding: 60px 0 30px;
    }
    @media (max-width: 768px) {
      .grid-3 { grid-template-columns: 1fr; }
      .service-block { flex-direction: column; }
    }