/* roulang page: index */
:root {
      --deep-space: #050814;
      --midnight: #0A0E27;
      --glass-dark: rgba(10,14,39,0.8);
      --glass-light: rgba(20,24,62,0.6);
      --white-soft: rgba(255,255,255,0.03);
      --violet: #6C3CE1;
      --violet-glow: rgba(108,60,225,0.5);
      --cyan: #00F0FF;
      --cyan-glow: rgba(0,240,255,0.3);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #6B7A99;
      --success: #00E676;
      --warning: #FF5252;
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-pill: 20px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-hover: 0 12px 40px rgba(108,60,225,0.15);
      --border-glass: 1px solid rgba(108,60,225,0.2);
      --border-glow: 1px solid rgba(0,240,255,0.3);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      padding: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--deep-space);
      color: var(--text-secondary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      color: var(--text-primary);
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-top: 0;
    }

    h1 { font-size: 48px; line-height: 1.2; font-weight: 900; }
    h2 { font-size: 36px; line-height: 1.3; }
    h3 { font-size: 24px; line-height: 1.4; font-weight: 600; }
    p { margin-bottom: 1rem; color: var(--text-secondary); }

    a {
      color: var(--cyan);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: var(--violet);
      text-decoration: none;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: rgba(20,30,60,0.4);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: var(--border-glass);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 32px;
      transition: all 0.25s ease;
    }
    .glass-card:hover {
      border-color: rgba(0,240,255,0.3);
      box-shadow: var(--shadow-hover);
    }

    /* 按钮 */
    .btn-primary {
      background: var(--violet);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      box-shadow: 0 0 20px var(--violet-glow);
      transition: 0.2s;
      display: inline-block;
      text-align: center;
      letter-spacing: 0.02em;
    }
    .btn-primary:hover {
      background: #7B4FEA;
      box-shadow: 0 0 35px rgba(108,60,225,0.8), 0 0 60px var(--cyan-glow);
      transform: translateY(-2px);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
      display: inline-block;
    }
    .btn-outline:hover {
      border-color: white;
      color: white;
      box-shadow: 0 0 20px var(--cyan-glow);
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(5,8,20,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(108,60,225,0.15);
      z-index: 100;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: #FFFFFF;
      text-shadow: 0 0 8px rgba(108,60,225,0.6);
      letter-spacing: 1px;
    }
    .logo i {
      margin-right: 8px;
      color: var(--cyan);
    }

    .nav-links {
      display: flex;
      gap: 8px;
      align-items: center;
    }

    .nav-chip {
      background: transparent;
      color: var(--text-secondary);
      padding: 8px 18px;
      border-radius: var(--radius-pill);
      font-size: 14px;
      font-weight: 500;
      border: 1px solid transparent;
      transition: 0.2s;
      white-space: nowrap;
    }
    .nav-chip:hover, .nav-chip.active {
      background: rgba(108,60,225,0.2);
      color: var(--cyan);
      border: 1px solid rgba(0,240,255,0.4);
    }

    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 24px;
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 4px;
      }
      .nav-chip {
        padding: 6px 12px;
        font-size: 13px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(5,8,20,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px;
        gap: 12px;
        border-bottom: 1px solid rgba(108,60,225,0.2);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .nav-container .btn-primary {
        display: none;
      }
      .nav-links .btn-primary {
        display: inline-block;
        width: fit-content;
      }
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      background: radial-gradient(circle at 30% 40%, rgba(108,60,225,0.18) 0%, transparent 60%);
      padding-top: 72px;
    }
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero-image {
      flex: 1 1 400px;
      position: relative;
    }
    .hero-image img {
      width: 100%;
      border-radius: 24px;
      box-shadow: 0 0 30px rgba(0,240,255,0.2);
      border: 1px solid rgba(108,60,225,0.3);
    }
    .hero h1 {
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 20px;
      color: var(--text-secondary);
      margin-bottom: 16px;
    }
    .pain-point {
      color: var(--cyan);
      font-weight: 500;
      margin-bottom: 28px;
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      margin-bottom: 12px;
    }
    .divider {
      width: 60px;
      height: 4px;
      background: var(--violet);
      margin: 16px auto;
      border-radius: 4px;
    }

    /* 痛点卡片网格 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
    }

    /* 方案区偏移布局 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .solution-grid .glass-card:nth-child(2) {
      margin-top: 40px;
    }
    @media (max-width: 768px) {
      .solution-grid {
        grid-template-columns: 1fr;
      }
      .solution-grid .glass-card:nth-child(2) {
        margin-top: 0;
      }
    }

    .icon-box {
      font-size: 40px;
      color: var(--cyan);
      margin-bottom: 16px;
    }

    /* 数据卡片 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 40px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--cyan);
      text-shadow: 0 0 15px var(--cyan-glow);
    }

    /* 证言横向滚动 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 12px;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      min-width: 300px;
      flex: 0 0 auto;
      scroll-snap-align: start;
    }
    .avatar {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: var(--violet);
      border: 2px solid var(--cyan);
      margin-bottom: 16px;
    }
    blockquote {
      border-left: 3px solid var(--cyan);
      padding-left: 20px;
      font-style: italic;
      color: var(--text-secondary);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
      padding: 16px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      color: var(--text-primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      color: var(--text-secondary);
      padding-left: 12px;
      border-left: 3px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
      border-left: 3px solid var(--cyan);
      background: rgba(108,60,225,0.05);
    }

    /* 最终CTA */
    .cta-dark {
      background: linear-gradient(180deg, #030612 0%, #0A0E27 100%);
      text-align: center;
      border-top: 1px solid rgba(108,60,225,0.25);
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      section { padding: 60px 0; }
    }
    .footer-bottom {
      border-top: 1px solid rgba(108,60,225,0.2);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      color: var(--text-muted);
      font-size: 14px;
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      color: var(--text-secondary);
      transition: 0.2s;
    }
    .social-icons i:hover {
      color: var(--cyan);
      text-shadow: 0 0 12px var(--cyan);
    }