/* roulang page: index */
:root {
      --william-rock: #2C3E4F;
      --william-chalk: #F7F5F0;
      --william-red: #C44536;
      --william-red-deep: #A8382B;
      --william-white: #FFFFFF;
      --william-gray-text: #4A4A4A;
      --william-soft-gray: #E8E6E1;
      --william-shadow-sm: 0 2px 12px rgba(44,62,79,0.06);
      --william-shadow-hover: 0 8px 24px rgba(44,62,79,0.12);
      --william-radius: 8px;
      --william-radius-sm: 6px;
      --william-font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --william-font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --william-transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--william-font-sans);
      background-color: var(--william-chalk);
      color: var(--william-gray-text);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

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

    /* 导航栏 SaaS 命令栏风格 */
    .william-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(44,62,79,0.08);
      z-index: 40;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
    }

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

    .logo-icon {
      width: 8px;
      height: 8px;
      background: var(--william-red);
      display: inline-block;
      transform: rotate(45deg);
    }

    .logo-text {
      font-weight: 700;
      font-size: 24px;
      color: var(--william-rock);
      letter-spacing: 0.02em;
    }

    .logo-sub {
      font-family: var(--william-font-number);
      font-weight: 400;
      font-size: 13px;
      color: var(--william-gray-text);
      margin-left: 6px;
      letter-spacing: 0.04em;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--william-rock);
      position: relative;
    }

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

    .nav-right {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-box {
      display: flex;
      align-items: center;
      background: var(--william-chalk);
      border: 1px solid var(--william-soft-gray);
      border-radius: 20px;
      padding: 8px 16px;
      width: 180px;
      color: #7A7A7A;
      font-size: 14px;
    }

    .search-box i {
      margin-right: 8px;
      font-size: 14px;
      color: #9A9A9A;
    }

    .btn-nav-cta {
      background: var(--william-red);
      color: white;
      padding: 10px 20px;
      border-radius: var(--william-radius-sm);
      font-weight: 600;
      font-size: 14px;
      border: none;
      cursor: pointer;
      white-space: nowrap;
      transition: var(--william-transition);
    }

    .btn-nav-cta:hover {
      background: var(--william-red-deep);
      transform: scale(1.03);
      color: white;
    }

    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--william-rock);
      cursor: pointer;
    }

    @media (max-width: 1023px) {
      .nav-links, .search-box {
        display: none;
      }
      .hamburger {
        display: block;
      }
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      background: linear-gradient(rgba(44,62,79,0.72), rgba(44,62,79,0.78)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }

    .hero-content {
      max-width: 700px;
      padding: 120px 0 60px;
    }

    .hero-tag {
      font-size: 13px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--william-red);
      font-weight: 500;
      margin-bottom: 16px;
      background: rgba(255,255,255,0.1);
      display: inline-block;
      padding: 4px 12px;
      border-radius: 4px;
    }

    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: 0.02em;
      color: white;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 18px;
      opacity: 0.85;
      margin-bottom: 40px;
      max-width: 540px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--william-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--william-radius-sm);
      font-weight: 600;
      display: inline-block;
      border: none;
      cursor: pointer;
      transition: var(--william-transition);
    }

    .btn-primary:hover {
      background: var(--william-red-deep);
      transform: scale(1.03);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--william-radius-sm);
      font-weight: 600;
      display: inline-block;
      transition: var(--william-transition);
    }

    .btn-outline:hover {
      background: white;
      color: var(--william-rock);
    }

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      right: 40px;
      color: white;
      font-size: 24px;
      animation: bounce 2s infinite;
    }

    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
      40% { transform: translateY(-10px); }
      60% { transform: translateY(-4px); }
    }

    @media (max-width: 768px) {
      .hero-title { font-size: 32px; }
      .hero-sub { font-size: 16px; }
    }

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

    .section-title {
      font-size: 36px;
      font-weight: 600;
      color: var(--william-rock);
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .title-decor {
      width: 40px;
      height: 4px;
      background: var(--william-red);
      margin-bottom: 48px;
    }

    /* 优势图文交替 */
    .advantage-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 120px;
    }

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

    .adv-img img {
      width: 500px;
      height: 400px;
      object-fit: cover;
      border-radius: var(--william-radius);
      box-shadow: var(--william-shadow-sm);
    }

    .adv-text h3 {
      font-size: 20px;
      font-weight: 600;
    }

    .adv-number {
      color: var(--william-red);
      font-weight: 700;
      font-size: 18px;
    }

    @media (max-width: 1023px) {
      .advantage-row, .advantage-row.reverse {
        flex-direction: column;
      }
      .adv-img img {
        width: 100%;
        height: auto;
      }
    }

    /* 服务网格 2x3 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .service-card {
      background: var(--william-white);
      border-radius: var(--william-radius);
      box-shadow: var(--william-shadow-sm);
      overflow: hidden;
      transition: var(--william-transition);
    }

    .service-card:hover {
      box-shadow: var(--william-shadow-hover);
      transform: translateY(-2px);
    }

    .service-card img {
      height: 200px;
      object-fit: cover;
    }

    .service-card-body {
      padding: 24px;
    }

    .service-card-body h3 {
      font-weight: 600;
      margin-bottom: 8px;
    }

    @media (max-width: 1023px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 640px) {
      .services-grid { grid-template-columns: 1fr; }
    }

    /* 数据条 */
    .data-strip {
      background: var(--william-rock);
      color: white;
      padding: 48px 0;
    }
    .data-items {
      display: flex;
      justify-content: space-around;
      text-align: center;
    }
    .data-item .number {
      font-family: var(--william-font-number);
      font-size: 56px;
      font-weight: 700;
    }
    @media (max-width: 768px) {
      .data-items { flex-direction: column; gap: 24px; }
    }

    /* 案例交替 */
    .case-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 100px;
    }
    .case-row.reverse { flex-direction: row-reverse; }
    .case-img img {
      width: 600px;
      border-radius: var(--william-radius);
    }
    @media (max-width: 1023px) {
      .case-row, .case-row.reverse { flex-direction: column; }
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
    }
    .step-circle {
      width: 40px;
      height: 40px;
      background: var(--william-red);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    /* FAQ */
    .accordion-title {
      font-size: 18px;
      font-weight: 600;
      color: var(--william-rock);
    }

    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
    }
    @media (max-width: 768px) {
      .contact-grid { grid-template-columns: 1fr; }
    }

    /* 页脚 */
    .footer {
      background: var(--william-rock);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }