/* roulang page: index */
:root {
      --lemon: #CCFF00;
      --lemon-glow: rgba(204, 255, 0, 0.5);
      --lemon-light: #D9FF33;
      --deep-bg: #0A0F1E;
      --glass-bg: rgba(10, 20, 40, 0.75);
      --glass-border: rgba(204, 255, 0, 0.25);
      --text-cold: #E0E6F0;
      --text-muted: #8E9BAE;
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-full: 40px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --spacing-section: 100px;
      --transition: all 0.3s cubic-bezier(0.2, 0.0, 0, 1);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-bg);
      background-image: 
        radial-gradient(circle at 30% 20%, rgba(20, 30, 50, 0.9) 0%, #050812 90%),
        url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
      color: var(--text-cold);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 15, 30, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--glass-border);
      z-index: 100;
      transition: var(--transition);
    }

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

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--lemon);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .logo i {
      font-size: 2rem;
      color: var(--lemon);
      text-shadow: 0 0 12px var(--lemon-glow);
    }

    .nav-links {
      display: flex;
      gap: 8px;
      background: rgba(255,255,255,0.03);
      border-radius: 50px;
      padding: 6px;
      backdrop-filter: blur(10px);
    }

    .nav-link {
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 500;
      color: var(--text-muted);
      text-decoration: none;
      transition: var(--transition);
      font-size: 0.95rem;
      letter-spacing: 0.3px;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--lemon);
      background: rgba(204,255,0,0.08);
      box-shadow: 0 0 12px rgba(204,255,0,0.2);
    }

    .cta-btn {
      background: var(--lemon);
      color: #0A0F1E;
      font-weight: 700;
      padding: 12px 28px;
      border-radius: var(--radius-full);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition);
      box-shadow: 0 0 20px var(--lemon-glow);
      letter-spacing: 0.5px;
      border: none;
      cursor: pointer;
    }
    .cta-btn:hover {
      background: var(--lemon-light);
      box-shadow: 0 0 32px rgba(204,255,0,0.8);
      transform: translateY(-2px);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--lemon);
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      gap: 60px;
      min-height: 90vh;
    }
    .hero-content {
      flex: 1;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
      background: linear-gradient(to right, #fff, #CCFF00);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--text-muted);
      margin-bottom: 40px;
      max-width: 550px;
    }
    .hero-visual {
      flex: 1;
      position: relative;
      height: 400px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-lg);
      box-shadow: 0 0 40px rgba(204,255,0,0.15);
      border: 1px solid var(--glass-border);
      backdrop-filter: blur(2px);
    }
    .scroll-hint {
      margin-top: 40px;
      color: var(--lemon);
      font-size: 2rem;
      opacity: 0.6;
    }

    /* 板块通用 */
    section {
      padding: var(--spacing-section) 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: white;
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 痛点区 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .pain-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: var(--transition);
    }
    .pain-card:hover {
      border-color: var(--lemon);
      box-shadow: 0 0 25px rgba(204,255,0,0.25);
    }
    .pain-icon {
      font-size: 2.5rem;
      color: var(--lemon);
      margin-bottom: 20px;
    }
    .pain-card h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
    }

    /* 方案区 非对称栅格 */
    .solution-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 28px;
    }
    .solution-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .solution-card:hover {
      transform: translateY(-6px);
      border-color: var(--lemon);
      box-shadow: 0 16px 40px rgba(0,0,0,0.6);
    }
    .solution-card.large {
      grid-row: span 2;
    }
    .card-icon {
      font-size: 2.4rem;
      color: var(--lemon);
      margin-bottom: 20px;
    }
    .solution-card h3 {
      font-size: 1.7rem;
      margin-bottom: 14px;
    }
    .link-arrow {
      color: var(--lemon);
      font-weight: 600;
      margin-top: 20px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      text-decoration: none;
    }

    /* 成果展示 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-lg);
      padding: 48px;
      border: 1px solid var(--glass-border);
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--lemon);
      line-height: 1;
    }

    /* 证言横向滚动 */
    .testimonial-scroll {
      display: flex;
      gap: 32px;
      overflow-x: auto;
      padding: 20px 0 30px;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      flex: 0 0 400px;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 32px;
      scroll-snap-align: start;
    }
    .avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      background: url('/assets/images/coverpic/cover-2.webp') center/cover;
      border: 2px solid var(--lemon);
      margin-bottom: 20px;
    }

    /* FAQ */
    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: blur(15px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      transition: var(--transition);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 24px;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 24px;
    }

    /* 最终CTA */
    .final-cta {
      background: rgba(5, 10, 20, 0.9);
      backdrop-filter: blur(20px);
      border-top: 1px solid var(--lemon);
      border-bottom: 1px solid var(--lemon);
      text-align: center;
      padding: 80px 0;
    }

    /* 页脚 */
    .footer {
      padding: 60px 0 30px;
      border-top: 1px solid rgba(204,255,0,0.15);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
        text-align: center;
      }
      .solution-grid {
        grid-template-columns: 1fr 1fr;
      }
      .pain-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero h1 {
        font-size: 2.5rem;
      }
      .pain-grid, .solution-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        flex-wrap: wrap;
        gap: 30px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .testimonial-card {
        flex: 0 0 280px;
      }
    }