/* roulang page: index */
:root {
      --primary-deep: #0A1F3F;
      --accent-cyan: #00E5FF;
      --action-red: #FF4655;
      --bg-light: #F8FAFC;
      --card-white: #FFFFFF;
      --title-dark: #1E293B;
      --body-gray: #475569;
      --border-light: #CBD5E1;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", sans-serif;
      --transition-fast: 0.2s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg-light);
      color: var(--body-gray);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    h1, h2, h3 {
      color: var(--title-dark);
      font-weight: 700;
    }
    h1 {
      font-size: 36px;
      line-height: 1.3;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 28px;
      line-height: 1.35;
      font-weight: 600;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 20px;
      font-weight: 600;
    }
    p {
      font-size: 16px;
      line-height: 1.6;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-fast);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: white;
      box-shadow: 0 1px 0 #E2E8F0;
      z-index: 100;
      height: 64px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--accent-cyan);
      font-weight: 800;
      margin-right: 4px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--primary-deep);
      transition: color 0.2s, border-bottom 0.2s;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }
    .nav-links a:hover {
      color: var(--accent-cyan);
      border-bottom-color: var(--accent-cyan);
    }
    .nav-cta {
      margin-left: 24px;
      background: var(--action-red);
      color: white !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background var(--transition-fast);
      border-bottom: none !important;
    }
    .nav-cta:hover {
      background: #E03340;
      color: white !important;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 1.5px;
      background: var(--primary-deep);
      border-radius: 2px;
    }
    @media (max-width: 1023px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        background: white;
        width: 100%;
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.05);
        align-items: flex-start;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .nav-cta {
        margin-left: 0;
        width: 100%;
        text-align: center;
      }
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
      scroll-margin-top:  80px;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .text-cyan {
      color: var(--accent-cyan);
    }
    .text-red {
      color: var(--action-red);
    }
    /* hero */
    #hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background-color: var(--bg-light);
      background-image: radial-gradient(circle at 20% 30%, rgba(10,31,63,0.03) 0%, transparent 50%);
      padding-top: 96px;
      padding-bottom: 96px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      justify-content: space-between;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      margin-bottom: 20px;
      color: var(--primary-deep);
    }
    .hero-sub {
      font-size: 17px;
      color: var(--body-gray);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--action-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background var(--transition-fast);
    }
    .btn-primary:hover {
      background: #E03340;
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background var(--transition-fast);
    }
    .btn-secondary:hover {
      background: rgba(10,31,63,0.05);
    }
    .hero-image {
      flex: 1;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-card);
      min-height: 380px;
      box-shadow: var(--shadow-sm);
      background-blend-mode: overlay;
      background-color: rgba(10,31,63,0.1);
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column-reverse;
        gap: 40px;
      }
      .hero-image {
        width: 100%;
        min-height: 260px;
      }
      h1 {
        font-size: 28px;
      }
    }
    /* 指标看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-fast);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-cyan);
      line-height: 1.1;
      margin-bottom: 8px;
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .trend-up {
      color: #10B981;
      font-size: 18px;
    }
    .stat-label {
      color: var(--body-gray);
      font-weight: 500;
    }
    @media (max-width: 1024px) {
      .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 600px) {
      .dashboard-grid {
        grid-template-columns: 1fr;
      }
      .stat-number {
        font-size: 36px;
      }
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-fast);
      position: relative;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 44px;
      height: 44px;
      display: flex;
      align-items: center;
      margin-bottom: 24px;
    }
    .service-card h3 {
      margin-bottom: 12px;
    }
    .service-desc {
      color: var(--body-gray);
      margin-bottom: 24px;
      flex: 1;
    }
    .text-link {
      color: var(--accent-cyan);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 600px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比 */
    .compare-flex {
      display: flex;
      gap: 40px;
      align-items: stretch;
    }
    .compare-box {
      flex: 1;
      border-radius: var(--radius-card);
      padding: 40px;
      background: rgba(255,70,85,0.03);
    }
    .compare-box.right {
      background: rgba(0,229,255,0.04);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 20px 0;
      font-weight: 500;
    }
    .compare-cta {
      margin-top: 40px;
      text-align: center;
    }
    @media (max-width: 768px) {
      .compare-flex {
        flex-direction: column;
      }
    }
    /* faq */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--card-white);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: all 0.3s ease;
    }
    .faq-question {
      padding: 24px 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--title-dark);
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--bg-light);
      padding: 0 32px;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 20px 32px;
    }
    /* 联系表单 */
    .contact-grid {
      display: flex;
      gap: 48px;
      align-items: flex-start;
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .contact-form {
      flex: 1;
      display: flex;
            flex-direction: column;
      gap: 20px;
    }
    .contact-form input, .contact-form textarea {
      padding: 14px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-input);
      font-size: 16px;
      transition: 0.2s;
      width: 100%;
      background: #fff;
    }
    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 0 3px rgba(0,229,255,0.15);
      outline: none;
    }
    .brand-wall {
      flex: 0.8;
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
      align-items: center;
    }
    .brand-wall img {
      border-radius: 8px;
      background: #f1f5f9;
      padding: 10px;
    }
    @media (max-width: 768px) {
      .contact-grid {
        flex-direction: column;
      }
    }
    /* footer */
    .footer {
      background: var(--primary-deep);
      color: #CBD5E1;
      padding: 60px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .footer-logo {
      color: white;
            font-size: 22px;
      font-weight: 700;
    }
    .svg-icon {
      width: 24px;
      height: 24px;
      display: inline-block;
      stroke: currentColor;
      fill: none;
      stroke-width: 2;
    }