/* roulang page: index */
:root {
      --primary-warm: #E8C382;
      --primary-warm-hover: #d4a85c;
      --secondary-dark: #2A2A2A;
      --bg-warm-white: #F9F6F0;
      --accent-blue-gray: #6B7B8D;
      --text-body: #3D3D3D;
      --text-muted: #6E6E6E;
      --white: #FFFFFF;
      --border-light: #E6DFD3;
      --shadow-sm: 0 2px 16px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 6px 24px rgba(0, 0, 0, 0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 8px;
      --transition-base: 0.3s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-warm-white);
      color: var(--text-body);
      line-height: 1.8;
      font-size: 16px;
      font-weight: 400;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

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

    /* 导航 */
    .navbar-custom {
      background-color: var(--secondary-dark);
      height: 72px;
      display: flex;
      align-items: center;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      box-shadow: 0 2px 10px rgba(0,0,0,0.08);
      padding: 0 24px;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-warm);
      letter-spacing: -0.5px;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-links a {
      color: #F0F0F0;
      font-size: 15px;
      font-weight: 500;
      position: relative;
      padding: 8px 0;
      transition: color var(--transition-base);
      white-space: nowrap;
    }

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

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

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

    .btn-nav-cta {
      background-color: var(--primary-warm);
      color: var(--secondary-dark) !important;
      font-weight: 600;
      padding: 12px 28px !important;
      border-radius: var(--radius-btn);
      transition: background-color var(--transition-base), transform var(--transition-base);
      margin-left: 16px;
      white-space: nowrap;
      border: none;
      cursor: pointer;
    }

    .btn-nav-cta:hover {
      background-color: var(--primary-warm-hover);
      transform: translateY(-2px);
      color: var(--secondary-dark) !important;
    }

    .navbar-toggler-custom {
      background: transparent;
      border: none;
      color: #F0F0F0;
      font-size: 24px;
      display: none;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--secondary-dark);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.2);
      }
      .nav-links.active {
        display: flex;
      }
      .navbar-toggler-custom {
        display: block;
      }
      .btn-nav-cta {
        margin-left: 0;
        text-align: center;
        width: fit-content;
      }
      .nav-container {
        flex-wrap: wrap;
      }
    }

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

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--secondary-dark);
      letter-spacing: -0.5px;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 4px;
      background-color: var(--primary-warm);
      margin-top: 8px;
      transition: width 0.3s;
    }

    .section-subtitle {
      color: var(--text-muted);
      font-size: 18px;
      margin-bottom: 48px;
    }

    /* Hero */
    .hero-section {
      padding-top: 120px;
      background-color: var(--bg-warm-white);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-left {
      flex: 0 0 60%;
    }

    .hero-right {
      flex: 0 0 40%;
      position: relative;
    }

    .hero-title {
      font-size: 48px;
      font-weight: 800;
      color: var(--secondary-dark);
      line-height: 1.2;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 18px;
      color: #4a4a4a;
      margin: 20px 0 32px;
      line-height: 1.6;
    }

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

    .btn-primary-warm {
      background-color: var(--primary-warm);
      color: var(--secondary-dark);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      transition: background-color var(--transition-base), transform var(--transition-base);
      display: inline-block;
    }

    .btn-primary-warm:hover {
      background-color: var(--primary-warm-hover);
      transform: translateY(-2px);
      color: var(--secondary-dark);
    }

    .btn-outline-dark {
      background: transparent;
      border: 2px solid var(--secondary-dark);
      color: var(--secondary-dark);
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      transition: all var(--transition-base);
      display: inline-block;
    }

    .btn-outline-dark:hover {
      border-color: var(--primary-warm);
      color: var(--primary-warm);
      transform: translateY(-2px);
    }

    .hero-image {
      border-radius: var(--radius-img);
      box-shadow: var(--shadow-sm);
      width: 100%;
      object-fit: cover;
    }

    .data-badge {
      position: absolute;
      bottom: -15px;
      left: 20px;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      padding: 16px 24px;
      border-radius: 12px;
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 24px;
    }

    .data-item {
      text-align: center;
    }

    .data-number {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent-blue-gray);
      font-family: 'Inter', sans-serif;
    }

    @media (max-width: 992px) {
      .hero-grid {
        flex-direction: column-reverse;
      }
      .hero-left, .hero-right {
        flex: 1 1 auto;
        width: 100%;
      }
      .hero-title {
        font-size: 36px;
      }
      .data-badge {
        position: static;
        margin-top: 16px;
      }
    }

    /* 优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .advantage-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: box-shadow var(--transition-base);
      border-top: 4px solid var(--primary-warm);
      position: relative;
    }

    .advantage-card:hover {
      box-shadow: var(--shadow-hover);
    }

    .advantage-icon {
      font-size: 40px;
      color: var(--accent-blue-gray);
      margin-bottom: 20px;
    }

    .advantage-title {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 主营业务杂志布局 */
    .service-magazine {
      display: flex;
      gap: 24px;
    }

    .service-main-card {
      flex: 0 0 60%;
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .service-main-img {
      width: 100%;
      height: 400px;
      object-fit: cover;
    }

    .service-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      background: linear-gradient(transparent, rgba(0,0,0,0.7));
      color: white;
      padding: 40px 24px 24px;
    }

    .service-side {
      flex: 0 0 40%;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .service-small-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      gap: 16px;
    }

    @media (max-width: 992px) {
      .service-magazine {
        flex-direction: column;
      }
    }

    /* 案例瀑布流 */
    .cases-masonry {
      columns: 3;
      column-gap: 24px;
    }

    .case-card {
      break-inside: avoid;
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      transition: transform var(--transition-base), box-shadow var(--transition-base);
    }

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

    .case-img {
      width: 100%;
      display: block;
      transition: transform 0.3s;
    }

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

    .case-info {
      padding: 20px;
    }

    .case-tag {
      background: #fdf3e4;
      color: #b38b4a;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 14px;
      display: inline-block;
      margin-top: 8px;
    }

    @media (max-width: 992px) {
      .cases-masonry {
        columns: 2;
      }
    }
    @media (max-width: 576px) {
      .cases-masonry {
        columns: 1;
      }
    }

    /* 解决方案对比 */
    .compare-grid {
      display: flex;
      gap: 40px;
      align-items: center;
    }

    .compare-col {
      flex: 1;
    }

    .divider {
      width: 1px;
      background: #ddd2c2;
      align-self: stretch;
      margin: 0 10px;
    }

    .compare-list {
      list-style: none;
    }

    .compare-list li {
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .icon-check {
      color: var(--primary-warm);
    }

    @media (max-width: 768px) {
      .compare-grid {
        flex-direction: column;
      }
      .divider {
        display: none;
      }
    }

    /* FAQ */
    .accordion-custom .accordion-item {
      border: none;
      background: transparent;
      border-left: 4px solid var(--primary-warm);
      margin-bottom: 16px;
      transition: 0.3s;
    }

    .accordion-button {
      font-weight: 600;
      font-size: 18px;
      background: transparent;
      box-shadow: none;
    }

    .accordion-button:not(.collapsed) {
      color: var(--primary-warm);
      background: transparent;
    }

    /* CTA */
    .cta-section {
      background-color: #FBF3E4;
      text-align: center;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary-dark);
      color: #cccccc;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    .footer a {
      color: #cccccc;
      transition: color 0.2s;
    }

    .footer a:hover {
      color: var(--primary-warm);
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }