/* roulang page: index */
:root {
      --primary-deep: #1A1A2E;
      --accent-gold: #E2B04A;
      --bg-light: #F7F8FA;
      --card-white: #FFFFFF;
      --text-main: #1E1E1E;
      --text-soft: #5A5A5A;
      --border-light: #E8ECF0;
      --shadow-card: 0 2px 16px rgba(26, 26, 46, 0.06), 0 0 1px rgba(26, 26, 46, 0.04);
      --shadow-hover: 0 8px 30px rgba(26, 26, 46, 0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', 'DIN Alternate', 'PingFang SC', sans-serif;
      --transition-smooth: 0.3s ease;
      --container-max: 1280px;
      --section-gap: 120px;
    }

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

    body {
      font-family: var(--font-body);
      font-weight: 400;
      font-size: 16px;
      line-height: 1.8;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      border: none;
      outline: none;
      background: transparent;
    }

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

    /* 导航 */
    .nav {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      height: 72px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-family: var(--font-heading);
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .logo::after {
      content: "";
      display: inline-block;
      width: 6px;
      height: 6px;
      background: var(--accent-gold);
      border-radius: 50%;
      margin-left: 2px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }

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

    .nav-links a::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0;
      height: 2px;
      background: var(--primary-deep);
      transition: width 0.25s ease;
    }

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

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

    .btn-nav {
      background: var(--accent-gold);
      color: var(--primary-deep);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      transition: background 0.25s ease;
      white-space: nowrap;
    }

    .btn-nav:hover {
      background: #d4a03a;
    }

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

    .hamburger span {
      display: block;
      width: 24px;
      height: 2.5px;
      background: var(--primary-deep);
      border-radius: 2px;
      transition: 0.2s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      right: 0;
      bottom: 0;
      background: #FFFFFF;
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      z-index: 40;
      overflow-y: auto;
    }

    .mobile-menu a {
      font-size: 20px;
      font-weight: 600;
      color: var(--primary-deep);
    }

    /* Hero */
    .hero {
      background: var(--bg-light);
      padding: 0 24px;
      display: flex;
      align-items: center;
      min-height: 90vh;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
    }

    .hero-text {
      flex: 0 0 50%;
    }

    .hero-text h1 {
      font-family: var(--font-heading);
      font-size: 48px;
      line-height: 56px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--primary-deep);
      margin-bottom: 24px;
    }

    .hero-text p {
      font-size: 18px;
      color: var(--text-soft);
      margin-bottom: 36px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-gold);
      color: var(--primary-deep);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      transition: background 0.25s ease;
      display: inline-block;
    }

    .btn-primary:hover {
      background: #d4a03a;
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
    }

    .btn-outline:hover {
      background: var(--primary-deep);
      color: #fff;
    }

    .hero-visual {
      flex: 0 0 50%;
      position: relative;
      height: 500px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      overflow: hidden;
    }

    .hero-visual::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26, 26, 46, 0.65) 0%, rgba(26, 26, 46, 0.2) 100%);
    }

    /* 通用板块 */
    section {
      padding: var(--section-gap) 24px;
    }

    .section-title {
      font-family: var(--font-heading);
      font-size: 36px;
      line-height: 44px;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 48px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      align-items: stretch;
    }

    .service-big {
      grid-row: span 2;
      background: var(--card-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition-smooth);
    }

    .service-big:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .service-big img {
      height: 55%;
      object-fit: cover;
      width: 100%;
    }

    .service-big .card-content {
      padding: 28px 32px;
    }

    .service-small {
      background: var(--card-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 28px 32px;
      display: flex;
      gap: 20px;
      align-items: flex-start;
      transition: var(--transition-smooth);
    }

    .service-small:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .service-icon {
      width: 44px;
      height: 44px;
      background: #F0EDE4;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-gold);
      font-size: 24px;
      flex-shrink: 0;
    }

    .card-content h3 {
      font-family: var(--font-heading);
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .service-list {
      list-style: none;
      margin-top: 16px;
      color: var(--text-soft);
    }

    .service-list li {
      margin-bottom: 8px;
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    /* 优势数据 */
    .advantages-wrapper {
      background: var(--card-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 48px 40px;
      display: flex;
      justify-content: space-around;
      text-align: center;
    }

    .stat-item {
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 56px;
      font-weight: 700;
      color: var(--accent-gold);
      margin-bottom: 8px;
    }

    .stat-label {
      font-size: 16px;
      color: var(--text-soft);
    }

    .stat-line {
      width: 40px;
      height: 2px;
      background: var(--accent-gold);
      margin-top: 12px;
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .case-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: var(--transition-smooth);
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      height: 240px;
      overflow: hidden;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: 0.4s ease;
    }

    .case-card:hover .case-img img {
      transform: scale(1.03);
    }

    .case-content {
      padding: 24px 28px;
    }

    .tag {
      display: inline-block;
      background: #F0F2F5;
      color: var(--text-soft);
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      margin-right: 8px;
      margin-top: 12px;
    }

    /* 流程 */
    .steps-container {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }

    .step-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      flex: 1;
    }

    .step-circle {
      width: 64px;
      height: 64px;
      background: var(--bg-light);
      border: 2px solid var(--accent-gold);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent-gold);
      font-size: 28px;
      font-weight: 700;
    }

    .step-item.active .step-circle {
      background: var(--accent-gold);
      color: #fff;
    }

    /* FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    .faq-question {
      width: 100%;
      background: var(--card-white);
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      color: var(--primary-deep);
    }

    .faq-answer {
      background: var(--bg-light);
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
    }

    .faq-item.open .faq-answer {
      padding: 20px 24px;
      max-height: 300px;
    }

    /* CTA */
    .cta-band {
      background: var(--primary-deep);
      color: white;
      text-align: center;
      padding: 80px 24px;
    }

    .cta-band h2 {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
    }

    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: #CCCCCC;
      padding: 60px 24px 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-visual {
        height: 320px;
        width: 100%;
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .hero-text h1 {
        font-size: 32px;
        line-height: 40px;
      }
      .advantages-wrapper {
        flex-direction: column;
        gap: 32px;
      }
      .steps-container {
        flex-direction: column;
        gap: 32px;
      }
    }