/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --primary-orange: #FF5C00;
      --neon-cyan: #00F0B5;
      --bg-deep: #0D0D12;
      --bg-card: #1A1A24;
      --text-white: #F5F3FF;
      --text-dim: rgba(245, 243, 255, 0.7);
      --border-subtle: rgba(123, 47, 247, 0.15);
      --radius-card: 16px;
      --radius-btn: 50px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --container-max: 1280px;
      --section-gap: 100px;
    }

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

    body {
      background-color: var(--bg-deep);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Inter", sans-serif;
      color: var(--text-white);
      line-height: 1.5;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition-smooth);
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(13, 13, 18, 0.92);
      backdrop-filter: blur(20px);
      z-index: 1000;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(123, 47, 247, 0.1);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 24px;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: 1px;
    }

    .logo-icon {
      font-size: 28px;
      color: var(--neon-cyan);
      filter: drop-shadow(0 0 8px rgba(0, 240, 181, 0.6));
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-dim);
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--neon-cyan);
      transition: width var(--transition-smooth);
    }

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

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

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

    .hamburger span {
      width: 28px;
      height: 2px;
      background: var(--text-white);
      transition: var(--transition-smooth);
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: calc(100vh - 72px);
        background: rgba(13, 13, 18, 0.98);
        flex-direction: column;
        justify-content: center;
        gap: 40px;
        transform: translateX(100%);
        transition: transform 0.4s ease;
      }
      .nav-links.open {
        transform: translateX(0);
      }
      .hamburger {
        display: flex;
      }
    }

    /* 板块通用 */
    section {
      padding: var(--section-gap) 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    .section-title {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }

    .section-subtitle {
      color: var(--text-dim);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
      font-size: 18px;
    }

    /* Hero */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0D0D12 0%, #1A0F2E 100%);
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }

    .hero-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.3;
      z-index: 0;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero .highlight {
      color: var(--neon-cyan);
      text-shadow: 0 0 15px rgba(0, 240, 181, 0.5);
    }

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

    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary-orange);
      color: white;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 18px;
      box-shadow: 0 4px 20px rgba(255, 92, 0, 0.4);
    }

    .btn-primary:hover {
      background: var(--primary-purple);
      box-shadow: 0 0 25px rgba(123, 47, 247, 0.7);
      transform: translateY(-2px);
    }

    .btn-outline {
      border: 2px solid var(--neon-cyan);
      color: var(--neon-cyan);
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 18px;
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(0, 240, 181, 0.15);
      border-color: white;
      color: white;
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 36px;
      }
    }

    /* 痛点 */
    .pain-points {
      background: #0A0A0F;
      position: relative;
    }

    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .pain-card {
      background: var(--bg-card);
      border: 1px solid rgba(255, 0, 0, 0.15);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: var(--transition-smooth);
    }

    .pain-card:hover {
      border-color: var(--neon-cyan);
      transform: translateY(-8px);
    }

    .pain-icon {
      font-size: 36px;
      margin-bottom: 16px;
    }

    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 解决方案 交错布局 */
    .solution-alt {
      background: var(--bg-deep);
    }

    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
      flex-wrap: wrap;
    }

    .solution-row.reverse {
      flex-direction: row-reverse;
    }

    .solution-text {
      flex: 1;
    }

    .solution-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
    }

    .solution-img img {
      width: 100%;
      height: auto;
    }

    .solution-text h3 {
      font-size: 28px;
      margin-bottom: 16px;
      color: var(--neon-cyan);
    }

    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
    }

    /* 数据区 */
    .data-stats {
      background: #0A0A14;
      position: relative;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .stat-item .number {
      font-size: 48px;
      font-weight: 700;
      color: var(--neon-cyan);
      text-shadow: 0 0 20px rgba(0, 240, 181, 0.6);
    }

    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    /* 证言 */
    .testimonials {
      background: var(--bg-card);
    }

    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: #0D0D12;
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-subtle);
    }

    .testimonial-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: url('/assets/images/coverpic/cover-2.webp') center/cover;
    }

    @media (max-width: 768px) {
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq {
      background: var(--bg-deep);
    }

    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 24px 0;
    }

    .faq-question {
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-dim);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 16px;
    }

    /* CTA */
    .cta-final {
      background: linear-gradient(135deg, #7B2FF7, #FF5C00);
      text-align: center;
      padding: 80px 0;
    }

    /* 页脚 */
    .footer {
      background: #050508;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    .copyright {
      text-align: center;
      margin-top: 40px;
      color: var(--text-dim);
      font-size: 14px;
    }