/* roulang page: index */
:root {
      --deep-charcoal: #1A1A1A;
      --warm-copper: #D4A853;
      --soft-white: #FAFAF8;
      --pine-green: #2E5A3B;
      --body-text: #2B2B2B;
      --sub-text: #5C5C5C;
      --border-line: #E8E4DD;
      --card-bg: #FFFFFF;
      --card-shadow: 0 2px 16px rgba(26,26,26,0.06);
      --card-hover-shadow: 0 8px 30px rgba(26,26,26,0.12);
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --transition-base: 0.25s ease;
      --transition-smooth: 0.3s ease-out;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
      background-color: var(--soft-white);
      color: var(--body-text);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      color: var(--warm-copper);
      text-decoration: none;
      transition: color var(--transition-base), border var(--transition-base);
    }

    a:hover {
      color: var(--deep-charcoal);
      text-decoration: none;
    }

    /* 自定义容器微调 */
    .custom-container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 排版增强 */
    h1 {
      font-size: 3.2rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--deep-charcoal);
      line-height: 1.2;
    }

    h2 {
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--deep-charcoal);
      margin-bottom: 1.5rem;
      position: relative;
      display: inline-block;
    }

    h2::after {
      content: "";
      display: block;
      width: 40px;
      height: 4px;
      background-color: var(--warm-copper);
      margin-top: 0.5rem;
      border-radius: 2px;
    }

    h3 {
      font-size: 1.4rem;
      font-weight: 600;
      color: var(--deep-charcoal);
      margin-bottom: 0.5rem;
    }

    .lead {
      font-size: 1.1rem;
      color: var(--sub-text);
      line-height: 1.8;
    }

    .text-copper {
      color: var(--warm-copper);
    }

    .text-pine {
      color: var(--pine-green);
    }

    .bg-charcoal {
      background-color: var(--deep-charcoal);
    }

    .bg-soft {
      background-color: var(--soft-white);
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--deep-charcoal);
      color: #FFFFFF;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 600;
      border: none;
      display: inline-block;
      text-align: center;
      transition: background var(--transition-base), color var(--transition-base);
      font-size: 1rem;
      cursor: pointer;
      box-shadow: none;
    }

    .btn-primary:hover {
      background: var(--warm-copper);
      color: var(--deep-charcoal);
      text-decoration: none;
    }

    .btn-secondary {
      background: transparent;
      color: var(--deep-charcoal);
      border: 2px solid var(--deep-charcoal);
      border-radius: var(--radius-sm);
      padding: 12px 30px;
      font-weight: 600;
      display: inline-block;
      text-align: center;
      transition: all var(--transition-base);
      font-size: 1rem;
      cursor: pointer;
    }

    .btn-secondary:hover {
      background: var(--deep-charcoal);
      color: #FFFFFF;
      text-decoration: none;
    }

    .btn-copper {
      background: var(--warm-copper);
      color: var(--deep-charcoal);
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 700;
      border: none;
      transition: opacity var(--transition-base);
    }

    .btn-copper:hover {
      opacity: 0.9;
      color: var(--deep-charcoal);
    }

    .text-link {
      color: var(--warm-copper);
      font-weight: 500;
      border-bottom: 1px solid var(--warm-copper);
      padding-bottom: 2px;
      transition: border-color 0.2s, color 0.2s;
      display: inline-block;
    }

    .text-link:hover {
      border-bottom-color: var(--deep-charcoal);
      color: var(--deep-charcoal);
    }

    /* 导航杂志风格 */
    .brand-nav {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-line);
      padding: 0.8rem 0;
    }

    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo-text {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 1px;
    }

    .logo-xpj {
      color: var(--warm-copper);
    }

    .logo-group {
      color: var(--deep-charcoal);
    }

    .channel-nav {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-line);
      padding: 0.6rem 0;
      box-shadow: 0 2px 20px rgba(0,0,0,0.02);
    }

    .channel-scroll {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
      align-items: center;
      overflow-x: auto;
      white-space: nowrap;
      -webkit-overflow-scrolling: touch;
    }

    .channel-scroll a {
      font-weight: 500;
      color: var(--sub-text);
      padding-bottom: 4px;
      border-bottom: 3px solid transparent;
      transition: border-color 0.2s, color 0.2s;
      font-size: 1rem;
      text-decoration: none;
    }

    .channel-scroll a:hover,
    .channel-scroll a.active {
      color: var(--deep-charcoal);
      border-bottom-color: var(--warm-copper);
    }

    /* 卡片规范 */
    .custom-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      padding: 24px;
      transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
      height: 100%;
    }

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

    .icon-circle {
      font-size: 40px;
      color: var(--warm-copper);
      margin-bottom: 16px;
    }

    /* 场景卡片特殊底色 */
    .scene-card {
      background: #F5F3EF;
      border-radius: var(--radius-md);
      padding: 24px;
      transition: background var(--transition-base), box-shadow var(--transition-base);
    }

    .scene-card:hover {
      background: #FFFFFF;
      box-shadow: var(--card-hover-shadow);
    }

    /* Hero 图片微缩放 */
    .hero-image-hover {
      border-radius: var(--radius-lg);
      box-shadow: 0 8px 28px rgba(0,0,0,0.08);
      transition: transform var(--transition-smooth);
    }

    .hero-image-hover:hover {
      transform: scale(1.02);
    }

    /* 案例横向滚动 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 1rem;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }

    .case-card {
      flex: 0 0 320px;
      scroll-snap-align: start;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
      border-left: 4px solid var(--warm-copper);
      min-width: 280px;
    }

    .stat-number {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 3rem;
      color: var(--warm-copper);
      line-height: 1.1;
    }

    /* FAQ 手风琴自定义 */
    .faq-accordion .accordion-title {
      background: #FAFAF8;
      border: none;
      font-weight: 600;
      color: var(--deep-charcoal);
      font-size: 1.1rem;
      padding: 1rem 1.5rem;
      border-radius: var(--radius-sm);
      transition: background var(--transition-base);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-accordion .accordion-title:hover {
      background: #F5F3EF;
    }

    .faq-accordion .accordion-title::after {
      content: "\f067";
      font-family: "Font Awesome 6 Free";
      font-weight: 900;
      color: var(--warm-copper);
      font-size: 1.2rem;
    }

    .faq-accordion .is-active .accordion-title::after {
      content: "\f068";
    }

    .faq-accordion .accordion-content {
      background: #FFFFFF;
      border: none;
      padding: 1.2rem 1.5rem;
      color: var(--sub-text);
      border-radius: 0 0 var(--radius-sm) var(--radius-sm);
      animation: fadeSlide 0.3s ease;
    }

    @keyframes fadeSlide {
      from { opacity: 0; transform: translateY(-5px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* CTA 深色区块 */
    .ultimate-cta {
      background: var(--deep-charcoal);
      padding: 100px 0;
      position: relative;
    }

    .geometric-line {
      position: absolute;
      top: 20%;
      left: 5%;
      width: 120px;
      height: 1px;
      background: var(--warm-copper);
      opacity: 0.4;
      transform: rotate(15deg);
    }

    /* 页脚 */
    .footer-main {
      background: #1A1A1A;
      color: #B0B0B0;
      padding: 3rem 0 2rem;
    }

    .footer-main a {
      color: #B0B0B0;
      text-decoration: none;
    }

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

    .copyright-bar {
      background: #111111;
      color: #888888;
      font-size: 0.9rem;
      padding: 1rem 0;
    }

    /* 响应式调整 */
    @media screen and (max-width: 1024px) {
      h1 {
        font-size: 2.5rem;
      }
      h2 {
        font-size: 1.9rem;
      }
      .channel-scroll {
        gap: 1.2rem;
      }
      .case-card {
        flex: 0 0 280px;
      }
    }

    @media screen and (max-width: 640px) {
      h1 {
        font-size: 2rem;
      }
      h2 {
        font-size: 1.7rem;
      }
      .btn-primary, .btn-secondary {
        padding: 12px 24px;
        font-size: 0.95rem;
      }
      .ultimate-cta {
        padding: 70px 0;
      }
      .brand-row {
        flex-direction: column;
        gap: 0.5rem;
      }
      .channel-scroll {
        gap: 1rem;
      }
      .case-scroll {
        gap: 16px;
      }
      .case-card {
        flex: 0 0 260px;
      }
    }