/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --primary: #F04E23;
      --primary-hover: #D13E1A;
      --secondary: #1A1F36;
      --white: #FFFFFF;
      --bg-light: #FAFAFA;
      --bg-card: #FFFFFF;
      --text-main: #1A1F36;
      --text-muted: #5A5F6E;
      --text-light: #8A8F9E;
      --border: #E8E9ED;
      --border-input: #D1D3DA;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(240,78,35,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-data: "Inter", "Roboto", sans-serif;
      --transition: 0.3s ease;
      --container-max: 1280px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, select {
      font-family: inherit;
      font-size: inherit;
      outline: none;
      border: none;
      background: none;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航系统 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
      z-index: 50;
      height: 72px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
    }

    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--secondary);
      position: relative;
      padding: 4px 0;
    }

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

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

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
    }

    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 2px;
      transition: var(--transition);
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--secondary);
        flex-direction: column;
        justify-content: center;
        gap: 36px;
        transition: right 0.4s ease;
        box-shadow: -5px 0 25px rgba(0,0,0,0.15);
      }
      .nav-links.active {
        right: 0;
      }
      .nav-links a {
        color: white;
        font-size: 18px;
      }
      .hamburger {
        display: flex;
        z-index: 55;
      }
      .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
      }
      .hamburger.active span:nth-child(2) {
        opacity: 0;
      }
      .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
      }
    }

    /* 板块通用间距 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }

    /* 按钮组件 */
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background var(--transition), transform 0.2s;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition);
    }
    .btn-secondary:hover {
      background: var(--secondary);
      color: white;
      border-color: var(--secondary);
    }
    @media (max-width: 768px) {
      .btn-primary, .btn-secondary {
        width: 100%;
        text-align: center;
      }
    }

    /* Hero */
    .hero {
      padding-top: 140px;
      padding-bottom: 80px;
      background: radial-gradient(circle at 20% 30%, #fff2ee 0%, #fafafa 70%);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      display: flex;
      gap: 60px;
      align-items: center;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 400px;
    }
    .hero-right {
      flex: 1 1 450px;
      display: flex;
      gap: 20px;
      justify-content: center;
    }
    .hero h1 {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--secondary);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 30px;
    }
    .cta-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .data-card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 24px 20px;
      text-align: center;
      min-width: 130px;
      transition: var(--transition);
    }
    .data-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .data-num {
      font-family: var(--font-data);
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.1;
    }
    .data-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 8px;
    }
    .live-badge {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 13px;
      color: var(--primary);
      margin-top: 15px;
      justify-content: center;
    }
    .live-dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      animation: pulse 1.4s infinite;
    }
    @keyframes pulse {
      0% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(1.3); }
      100% { opacity: 1; transform: scale(1); }
    }
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 32px;
      }
      .hero-right {
        flex-wrap: wrap;
      }
    }

    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 40px;
    }
    .adv-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }
    .adv-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .adv-icon {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .adv-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .adv-card p {
      color: var(--text-muted);
      font-size: 15px;
    }
    @media (max-width: 1024px) {
      .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 服务矩阵 2x3 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .service-img {
      height: 180px;
      background: #F0F1F5;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .service-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .service-info {
      padding: 24px;
    }
    .service-info h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .service-info p {
      color: var(--text-muted);
      font-size: 15px;
    }
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据对比 */
    .comparison-wrapper {
      display: flex;
      gap: 30px;
      margin-top: 40px;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1 1 280px;
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .compare-col.highlight {
      border-left: 4px solid var(--primary);
    }
    .compare-col h3 {
      font-size: 22px;
      margin-bottom: 24px;
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid var(--border);
    }
    .compare-value {
      font-weight: 700;
      color: var(--secondary);
    }
    .highlight .compare-value {
      color: var(--primary);
    }

    /* FAQ */
    .faq-list {
      margin-top: 30px;
      border-top: 1px solid var(--border);
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
    }
    .faq-question {
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 18px 0;
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      background: transparent;
      color: var(--secondary);
    }
    .faq-icon {
      font-size: 20px;
      transition: transform 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.7;
      padding-right: 20px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 转化表单 */
    .contact-section {
      background: var(--secondary);
      color: white;
    }
    .contact-form {
      max-width: 600px;
      margin: 40px auto 0;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .contact-form input, .contact-form select {
      background: white;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-input);
      padding: 14px 16px;
      font-size: 16px;
      width: 100%;
    }
    .contact-form input:focus, .contact-form select:focus {
      border-color: var(--primary);
    }
    .btn-form {
      background: var(--primary);
      color: white;
      padding: 16px;
      font-weight: 600;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: background var(--transition);
    }
    .btn-form:hover {
      background: var(--primary-hover);
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: white;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer a {
      color: #ccc;
      font-size: 14px;
    }
    .footer a:hover {
      color: var(--primary);
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 25px;
      text-align: center;
      font-size: 14px;
      color: var(--text-light);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }