/* roulang page: index */
:root {
      --primary: #0ABF7E;
      --primary-dark: #089e68;
      --secondary: #1A1F2B;
      --accent: #FF6B3D;
      --accent-hover: #e55a2f;
      --bg: #F4F6F9;
      --card: #FFFFFF;
      --text-primary: #1A1F2B;
      --text-secondary: #5A6272;
      --text-muted: #8E96A3;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-button: 0 8px 24px rgba(10,191,126,0.25);
      --radius-card: 16px;
      --radius-button: 30px;
      --radius-input: 12px;
      --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    button, input, textarea {
      font-family: inherit;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--text-primary);
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 8px;
      position: relative;
      overflow: hidden;
    }

    .logo-icon::after {
      content: "";
      position: absolute;
      width: 20px;
      height: 20px;
      background: white;
      border-radius: 50%;
      top: 6px;
      left: 6px;
      opacity: 0.8;
      transform: scale(1.2);
      filter: blur(3px);
    }

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

    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 8px 0;
      transition: color var(--transition);
    }

    .nav-link::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }

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

    .nav-link:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: background var(--transition), box-shadow var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: var(--shadow-button);
    }

    .btn-accent {
      background: var(--accent);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 24px rgba(255,107,61,0.3);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 18px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 0;
    }

    .hamburger span {
      width: 100%;
      height: 2px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: var(--transition);
    }

    @media (max-width: 1024px) {
      .nav-menu {
        gap: 20px;
      }
    }

    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        transform: translateY(-120%);
        transition: transform 0.3s ease;
        box-shadow: 0 12px 24px rgba(0,0,0,0.05);
        align-items: flex-start;
      }
      .nav-menu.active {
        transform: translateY(0);
      }
      .nav-link {
        font-size: 18px;
      }
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #f0f9f6 0%, #ffffff 100%);
      position: relative;
      overflow: hidden;
      margin-top: 72px;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 500px;
    }

    .hero-title {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-primary);
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      line-height: 1.7;
    }

    .hero-stats {
      display: flex;
      gap: 32px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }

    .stat-item {
      text-align: left;
    }

    .stat-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary);
      font-variant-numeric: tabular-nums;
    }

    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
    }

    .hero-image {
      flex: 1 1 400px;
      position: relative;
    }

    .hero-bg-visual {
      width: 100%;
      height: 380px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      position: relative;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    }

    .hero-bg-visual::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,191,126,0.2) 0%, rgba(26,31,43,0.1) 100%);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 36px;
      }
      .hero-content {
        flex-direction: column;
        gap: 40px;
      }
      .hero-bg-visual {
        height: 260px;
        width: 100%;
      }
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-primary);
    }

    .section-sub {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }

    /* 数据看板 */
    .dashboard {
      background: var(--secondary);
      color: white;
    }
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      text-align: center;
    }
    .dash-num {
      font-size: 38px;
      font-weight: 700;
      color: var(--primary);
    }
    .dash-label {
      color: rgba(255,255,255,0.8);
      font-size: 16px;
    }
    @media (max-width: 768px) {
      .dashboard-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card);
      padding: 40px 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 16px 32px rgba(0,0,0,0.08);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .service-title {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-desc {
      color: var(--text-secondary);
      font-size: 15px;
    }
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比 */
    .compare-row {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1 1 280px;
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
    }
    .compare-col.highlight {
      background: #f0fdf7;
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      padding: 12px 0;
      display: flex;
      align-items: center;
      gap: 12px;
      border-bottom: 1px solid #eee;
    }
    .check-icon {
      color: var(--primary);
      font-weight: bold;
    }

    /* 案例滚动 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 280px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      flex-shrink: 0;
    }
    .case-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .case-info {
      padding: 16px;
    }
    .case-growth {
      color: var(--accent);
      font-weight: 700;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      padding: 0 24px;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      user-select: none;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-icon {
      transition: transform 0.3s;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA表单 */
    .cta-block {
      background: var(--primary);
      border-radius: 32px;
      padding: 60px 40px;
      color: white;
    }
    .form-row {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .form-input {
      flex: 1 1 200px;
      padding: 14px 18px;
      border: none;
      border-radius: var(--radius-input);
      background: white;
      font-size: 16px;
    }
    .btn-submit {
      background: var(--accent);
      color: white;
      border: none;
      border-radius: var(--radius-button);
      padding: 14px 32px;
      font-weight: 600;
      cursor: pointer;
      transition: background var(--transition);
    }
    .btn-submit:hover {
      background: var(--accent-hover);
    }

    /* Footer */
    .footer {
      background: var(--secondary);
      color: white;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a:hover {
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }