/* roulang page: index */
:root {
      --primary-cyan: #00F0FF;
      --primary-cyan-dark: #00C2FF;
      --accent-magenta: #FF3366;
      --accent-magenta-light: #FF4D7A;
      --bg-deep: #0A0E27;
      --bg-darker: #060918;
      --bg-card: rgba(26, 31, 58, 0.6);
      --text-white: #FFFFFF;
      --text-muted: #B0B8D0;
      --border-subtle: rgba(0, 240, 255, 0.15);
      --border-input: #2A2F5A;
      --radius-lg: 16px;
      --radius-pill: 50px;
      --radius-md: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(255, 51, 102, 0.6);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-number: 'Inter', 'SF Pro Display', sans-serif;
      --transition: all 0.3s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-muted);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      color: var(--text-white);
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--primary-cyan-dark) 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
      color: var(--text-white);
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      border: none;
      font-weight: 600;
      font-size: 16px;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 80px;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 1000;
      border-bottom: 1px solid var(--border-subtle);
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .nav-left, .nav-right {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-link {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 4px 0;
    }

    .nav-link:hover {
      color: var(--primary-cyan);
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary-cyan), var(--primary-cyan-dark));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 8px rgba(0,240,255,0.4);
      letter-spacing: 1px;
      white-space: nowrap;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 28px;
      height: 2px;
      background-color: var(--primary-cyan);
      border-radius: 4px;
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 80px;
      left: 0;
      width: 100%;
      background: rgba(6, 9, 24, 0.98);
      backdrop-filter: blur(20px);
      padding: 32px 24px;
      flex-direction: column;
      gap: 24px;
      z-index: 999;
    }

    .mobile-menu a {
      font-size: 20px;
      color: var(--text-white);
      text-align: center;
    }

    .mobile-menu a:hover {
      color: var(--primary-cyan);
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
      scroll-margin-top: 80px;
    }

    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      min-height: 100vh;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding-top: 80px;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(0,240,255,0.08) 0%, transparent 60%);
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 55%;
    }

    .hero-text h1 {
      margin-bottom: 20px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-magenta);
      color: white;
      border-radius: var(--radius-pill);
      padding: 14px 36px;
      box-shadow: 0 4px 12px rgba(255,51,102,0.4);
    }

    .btn-primary:hover {
      background: var(--accent-magenta-light);
      box-shadow: var(--shadow-glow);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--primary-cyan);
      color: var(--primary-cyan);
      border-radius: var(--radius-pill);
      padding: 14px 36px;
    }

    .btn-ghost:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 18px rgba(0,240,255,0.5);
    }

    .hero-visual {
      flex: 1 1 40%;
      display: flex;
      justify-content: center;
    }

    .hero-visual img {
      max-height: 420px;
      filter: drop-shadow(0 0 30px rgba(0,240,255,0.4));
    }

    /* 痛点卡片 */
    .grid-2col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pain-card {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 32px;
      position: relative;
      transition: var(--transition);
    }

    .pain-card::before {
      content: '';
      position: absolute;
      left: 0;
      top: 24px;
      bottom: 24px;
      width: 4px;
      background: var(--primary-cyan);
      border-radius: 0 8px 8px 0;
    }

    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 40px rgba(0,240,255,0.15);
    }

    /* 解决方案不对称栅格 */
    .solution-row {
      display: flex;
      gap: 48px;
      align-items: center;
      margin-bottom: 80px;
    }

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

    .solution-img {
      flex: 1 1 45%;
    }

    .solution-img img {
      border-radius: 24px;
      border: 1px solid var(--border-subtle);
    }

    .solution-desc {
      flex: 1 1 50%;
    }

    .tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary-cyan);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 12px;
    }

    /* 数据成果 */
    .stats-grid {
      display: flex;
      justify-content: center;
      gap: 64px;
      flex-wrap: wrap;
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 56px;
      font-weight: 700;
      color: var(--primary-cyan);
      line-height: 1.2;
    }

    /* 证言横向滑动 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }

    .testimonial-card {
      min-width: 300px;
      flex: 0 0 auto;
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 28px;
      scroll-snap-align: start;
    }

    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      border: 2px solid var(--primary-cyan);
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-item {
      background: #1A1F3A;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      background: transparent;
      color: var(--text-white);
      padding: 20px 24px;
      font-size: 18px;
      font-weight: 500;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border: none;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
    }

    /* CTA区块 */
    .cta-block {
      background: rgba(255,51,102,0.08);
      border: 1px solid var(--accent-magenta);
      border-radius: 32px;
      padding: 64px;
      text-align: center;
    }

    .footer {
      background: var(--bg-darker);
      border-top: 1px solid var(--primary-cyan);
      padding: 60px 0 30px;
    }

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

    @media (max-width: 992px) {
      .nav-left, .nav-right {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .grid-2col {
        grid-template-columns: 1fr;
      }
      .solution-row {
        flex-direction: column;
      }
      .solution-row.reverse {
        flex-direction: column;
      }
      h1 {
        font-size: 40px;
      }
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 28px;
      }
      section {
        padding: 70px 0;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }