/* roulang page: index */
:root {
      --primary: #1A5FFF;
      --primary-hover: #3470FF;
      --primary-glow: rgba(26, 95, 255, 0.4);
      --secondary: #FF6B35;
      --accent-green: #00C48C;
      --danger: #E53E3E;
      --bg-light: #F5F6FA;
      --bg-dark: #0B0F19;
      --bg-hero: #0A0D14;
      --text-dark: #1F2329;
      --text-mid: #6B7280;
      --text-light: #9CA3AF;
      --text-white: #FFFFFF;
      --text-light-bg: #E5E7EB;
      --card-white: #FFFFFF;
      --card-glass: rgba(255, 255, 255, 0.08);
      --card-glass-border: rgba(255, 255, 255, 0.08);
      --border-light: #E5E7EB;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04), 0 0 1px rgba(0,0,0,0.06);
      --shadow-dark-card: 0 4px 24px rgba(0,0,0,0.3), 0 0 0 1px rgba(255,255,255,0.06);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 767px) {
      .container {
        padding: 0 16px;
      }
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      background: transparent;
    }
    .header.scrolled {
      background: rgba(10, 13, 20, 0.85);
      backdrop-filter: blur(20px);
      box-shadow: 0 1px 0 rgba(255,255,255,0.08);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: #fff;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
      transition: color 0.3s;
    }
    .logo span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255,255,255,0.75);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-cta {
      background: var(--primary);
      color: #fff !important;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      transition: background 0.2s, box-shadow 0.2s;
      box-shadow: 0 0 12px rgba(26,95,255,0.3);
    }
    .nav-cta:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 20px var(--primary-glow);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: #fff;
      cursor: pointer;
    }
    @media (max-width: 767px) {
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(10,13,20,0.96);
        backdrop-filter: blur(24px);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        z-index: 999;
        transform: translateX(100%);
        transition: transform 0.3s ease;
      }
      .mobile-menu.open {
        transform: translateX(0);
      }
      .mobile-menu a {
        color: #fff;
        font-size: 20px;
        text-decoration: none;
        font-weight: 500;
      }
      .mobile-menu .nav-cta {
        background: var(--primary);
        padding: 12px 28px;
        color: #fff;
        border-radius: 30px;
      }
    }
    /* Hero */
    .hero {
      background: radial-gradient(circle at 30% 40%, rgba(26,95,255,0.15) 0%, transparent 60%), 
                  radial-gradient(circle at 70% 60%, rgba(255,107,53,0.08) 0%, transparent 50%),
                  linear-gradient(135deg, #0A0D14 0%, #111827 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 48px;
      width: 100%;
    }
    .hero-text {
      flex: 1;
      color: #fff;
    }
    .hero h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: #fff;
    }
    .hero .subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      padding: 14px 32px;
      border-radius: 8px;
      font-weight: 600;
      text-decoration: none;
      transition: 0.2s;
      box-shadow: 0 0 20px rgba(26,95,255,0.4);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 28px rgba(26,95,255,0.6);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: 8px;
      font-weight: 600;
      text-decoration: none;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(26,95,255,0.06);
    }
    .hero-visual {
      flex: 1;
      position: relative;
      height: 400px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }
    @media (max-width: 1023px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 36px;
      }
      .hero-visual {
        width: 100%;
        height: 280px;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    /* 通用区块 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 767px) {
      section {
        padding: 48px 0;
      }
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-dark);
    }
    .section-desc {
      font-size: 18px;
      color: var(--text-mid);
      margin-bottom: 48px;
    }
    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 12px;
      padding: 32px 24px;
      color: #fff;
      text-align: center;
    }
    .pain-card i {
      font-size: 32px;
      color: var(--secondary);
      margin-bottom: 16px;
    }
    @media (max-width: 767px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: #fff;
      border-radius: 12px;
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: transform 0.2s;
    }
    .solution-card:hover {
      transform: translateY(-4px);
    }
    .solution-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 20px;
    }
    @media (max-width: 767px) {
      .solution-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 数据展示深色区 */
    .stats-area {
      background: var(--bg-dark);
      color: #fff;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 32px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--secondary);
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 12px;
      padding: 24px;
      color: #fff;
    }
    @media (max-width: 767px) {
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      background: #fff;
      border-radius: 12px;
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-mid);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* 最终CTA */
    .final-cta {
      background: radial-gradient(circle at 50% 50%, rgba(26,95,255,0.2) 0%, transparent 70%), #0A0D14;
      text-align: center;
      color: #fff;
      padding: 80px 0;
    }
    .footer {
      background: #0A0D14;
      color: var(--text-light);
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 32px;
    }
    @media (max-width: 767px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }