/* roulang page: index */
:root {
      --primary: #6C3CF0;
      --secondary: #00F0C8;
      --bg-deep: #0A0B10;
      --bg-card: #111320;
      --bg-alt: #15102A;
      --text-white: #FFFFFF;
      --text-light: #B0C0D0;
      --text-muted: #6B7280;
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(108,60,240,0.25);
      --radius-lg: 24px;
      --radius-card: 16px;
      --radius-btn: 50px;
      --shadow-glow: 0 0 30px rgba(108,60,240,0.5);
      --shadow-card: 0 15px 35px rgba(0,0,0,0.5);
      --transition: all 0.25s ease;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-light);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    section {
      padding: 120px 0;
    }

    img {
      max-width: 100%;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 80px;
      background: rgba(10, 11, 16, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(108, 60, 240, 0.15);
      display: flex;
      align-items: center;
      z-index: 1000;
      transition: background 0.3s;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: var(--text-white);
      letter-spacing: 1px;
    }

    .logo svg {
      width: 36px;
      height: 36px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-size: 15px;
      font-weight: 500;
    }

    .nav-links a {
      color: var(--text-light);
      position: relative;
      padding: 6px 0;
    }

    .nav-links a:hover {
      color: var(--text-white);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -4px;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width 0.3s;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 18px rgba(108,60,240,0.5);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, #6C3CF0, #5a2fd0);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #7b4df2, #6C3CF0);
      box-shadow: 0 0 30px var(--secondary), 0 0 20px var(--primary);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }

    .btn-outline:hover {
      background: rgba(108,60,240,0.15);
      border-color: var(--secondary);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .hamburger span {
      width: 26px;
      height: 3px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }

    /* 首屏 Hero */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(180deg, rgba(10,11,16,0.85) 0%, #0A0B10 95%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
    }

    .hero-content {
      max-width: 750px;
    }

    .hero h1 {
      font-size: 58px;
      font-weight: 700;
      color: white;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 24px;
    }

    .hero h1 span {
      background: linear-gradient(to right, var(--secondary), #6ee7c0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero p {
      font-size: 20px;
      color: var(--text-light);
      max-width: 600px;
      margin-bottom: 40px;
    }

    /* 板块标题 */
    .section-title {
      font-size: 44px;
      font-weight: 700;
      color: white;
      text-align: center;
      margin-bottom: 64px;
      text-shadow: 0 2px 10px rgba(108,60,240,0.2);
    }

    /* 解决方案卡片 */
    .solutions-grid {
      display: flex;
      gap: 30px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .solution-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 40px 28px;
      flex: 1 1 280px;
      max-width: 340px;
      transition: all 0.35s;
      box-shadow: var(--shadow-card);
      position: relative;
    }

    .solution-card.featured {
      border-color: rgba(0,240,200,0.4);
      transform: scale(1.05);
      background: rgba(0,240,200,0.03);
      box-shadow: 0 0 40px rgba(0,240,200,0.25);
    }

    .solution-card:hover {
      transform: translateY(-10px);
      border-color: var(--secondary);
      background: rgba(255,255,255,0.06);
    }

    .icon-circle {
      width: 60px;
      height: 60px;
      background: rgba(108,60,240,0.2);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      font-size: 28px;
    }

    .solution-card h3 {
      font-size: 24px;
      font-weight: 600;
      color: white;
      margin-bottom: 12px;
    }

    .solution-card p {
      font-size: 15px;
      color: var(--text-light);
    }

    /* 数据展示 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      justify-content: center;
    }

    .stat-item {
      text-align: center;
      flex: 1 1 200px;
    }

    .stat-number {
      font-size: 64px;
      font-weight: 800;
      background: linear-gradient(135deg, #6C3CF0, #00F0C8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 12px;
      font-family: 'Inter', monospace;
    }

    .stat-label {
      color: var(--text-light);
      font-size: 18px;
    }

    /* 证言卡片 */
    .testimonial-grid {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .testimonial-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(108,60,240,0.3);
      border-radius: var(--radius-card);
      padding: 36px;
      display: flex;
      gap: 24px;
      flex: 1 1 480px;
    }

    .testimonial-text {
      border-left: 4px solid var(--secondary);
      padding-left: 20px;
      font-style: italic;
      font-size: 18px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: rgba(255,255,255,0.02);
      border-radius: 12px;
      margin-bottom: 16px;
      overflow: hidden;
      transition: 0.3s;
    }

    .faq-question {
      padding: 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: white;
      font-size: 18px;
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 24px;
      transition: max-height 0.4s ease;
      color: var(--text-light);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 24px;
    }

    /* CTA */
    .cta-block {
      background: linear-gradient(0deg, rgba(21,16,42,0.9) 0%, #0A0B10 100%), url('/assets/images/backpic/back-3.webp') center/cover;
      text-align: center;
    }

    /* 页脚 */
    .footer {
      background: #08090E;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 30px;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 24px;
      }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .hero h1 {
        font-size: 36px;
      }
      .section-title {
        font-size: 32px;
      }
      .solution-card.featured {
        transform: none;
      }
    }