/* roulang page: index */
:root {
      --primary: #1A1F2E;
      --primary-dark: #0f121a;
      --accent: #C5A45E;
      --accent-light: rgba(197, 164, 94, 0.12);
      --highlight: #E85D3A;
      --bg: #F8F7F4;
      --card-bg: #FFFFFF;
      --text-primary: #1A1F2E;
      --text-body: #4A4F5A;
      --text-muted: #8A8F98;
      --border-light: #E8E6E1;
      --shadow-card: 0 2px 12px rgba(26, 31, 46, 0.04);
      --shadow-card-hover: 0 8px 30px rgba(26, 31, 46, 0.08);
      --shadow-nav: 0 1px 8px rgba(26, 31, 46, 0.06);
      --radius-sm: 12px;
      --radius-md: 16px;
      --radius-lg: 20px;
      --radius-xl: 24px;
      --radius-pill: 50px;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --container-max: 1200px;
      --section-gap: 120px;
      --card-padding-lg: 32px;
      --card-padding-sm: 24px;
      --transition-base: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: var(--text-primary);
    }

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

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

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

    /* 导航卡片面板 */
    .navbar-custom {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 48px);
      max-width: var(--container-max);
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: var(--shadow-nav);
      border-radius: var(--radius-md);
      padding: 12px 24px;
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: background var(--transition-base), box-shadow var(--transition-base);
      border: 1px solid transparent;
    }

    .navbar-custom.scrolled {
      background: rgba(255, 255, 255, 0.98);
      box-shadow: 0 4px 20px rgba(26, 31, 46, 0.1);
    }

    .nav-brand {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.02em;
      color: var(--primary);
      display: flex;
      align-items: center;
    }

    .nav-brand i {
      font-size: 1.8rem;
      color: var(--accent);
      margin-right: 8px;
    }

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

    .nav-icon-btn {
      width: 40px;
      height: 40px;
      background: #f0f0f0;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-body);
      font-size: 1.1rem;
      transition: background var(--transition-base), color var(--transition-base);
      position: relative;
    }

    .nav-icon-btn span {
      display: none;
    }

    .nav-icon-btn:hover {
      background: var(--accent-light);
      color: var(--primary);
    }

    .nav-cta {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-sm);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: background var(--transition-base), transform var(--transition-base);
      white-space: nowrap;
    }

    .nav-cta:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      color: white;
    }

    /* 移动端底部悬浮导航 */
    .mobile-bottom-nav {
      display: none;
    }

    @media (max-width: 991px) {
      .navbar-custom .nav-links {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 16px;
        left: 50%;
        transform: translateX(-50%);
        width: calc(100% - 32px);
        max-width: 500px;
        background: rgba(26, 31, 46, 0.95);
        backdrop-filter: blur(15px);
        border-radius: var(--radius-xl);
        padding: 8px 16px;
        z-index: 1000;
        justify-content: space-around;
        align-items: center;
        box-shadow: 0 8px 30px rgba(0,0,0,0.2);
      }
      .mobile-nav-item {
        color: white;
        font-size: 0.7rem;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
        opacity: 0.75;
        transition: opacity var(--transition-base);
      }
      .mobile-nav-item i {
        font-size: 1.3rem;
      }
      .mobile-nav-item.active {
        opacity: 1;
        color: var(--accent);
      }
      .mobile-cta-icon {
        background: var(--highlight);
        width: 44px;
        height: 44px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        font-size: 1.2rem;
      }
    }

    /* Hero */
    #hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #F8F7F4 0%, #FFFFFF 100%);
      position: relative;
      overflow: hidden;
      padding-top: 100px;
      padding-bottom: 60px;
    }

    .hero-bg-blob {
      position: absolute;
      right: -100px;
      bottom: -80px;
      width: 500px;
      height: 500px;
      background: rgba(197, 164, 94, 0.05);
      border-radius: 50%;
      filter: blur(80px);
    }

    .hero-title-line {
      width: 40px;
      height: 4px;
      background: var(--accent);
      margin-bottom: 24px;
    }

    .hero h1 {
      font-size: clamp(2.2rem, 5vw, 3.8rem);
      font-weight: 700;
      margin-bottom: 1.2rem;
      color: var(--primary);
    }

    .hero .lead {
      font-size: 1.2rem;
      color: var(--text-muted);
      font-weight: 400;
      margin-bottom: 2rem;
    }

    .btn-primary-custom {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 600;
      border: none;
      transition: all var(--transition-base);
    }

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

    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 600;
      transition: all var(--transition-base);
    }

    .btn-outline-custom:hover {
      background: rgba(26, 31, 46, 0.05);
      color: var(--primary);
    }

    .btn-highlight {
      background: var(--highlight);
      color: white;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 600;
      border: none;
    }

    .btn-highlight:hover {
      filter: brightness(1.1);
      color: white;
    }

    /* 区块间距 */
    section {
      padding: var(--section-gap) 0;
    }

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

    /* 优势区 2+1 错位 */
    .advantage-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .adv-left-stack {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .adv-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: var(--card-padding-lg);
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
      border: 1px solid var(--border-light);
    }

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

    .adv-icon {
      color: var(--accent);
      font-size: 2rem;
      margin-bottom: 20px;
    }

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

    /* 数据带 */
    .data-strip {
      background: var(--primary);
      color: white;
      padding: 60px 0;
      border-radius: 0;
    }

    .data-number {
      font-size: 3.5rem;
      font-weight: 800;
      font-feature-settings: "tnum";
    }

    /* 业务卡片水平混排 */
    .service-card {
      display: flex;
      align-items: flex-start;
      gap: 20px;
      padding: 20px 0;
      border-bottom: 1px solid var(--border-light);
      transition: border-color var(--transition-base);
    }

    .service-card:hover {
      border-bottom: 1px solid var(--accent);
    }

    .service-img {
      width: 60px;
      height: 60px;
      border-radius: var(--radius-sm);
      object-fit: cover;
    }

    /* 案例横向滚动 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 20px;
      -ms-overflow-style: none;
      scrollbar-width: none;
    }

    .case-scroll::-webkit-scrollbar {
      display: none;
    }

    .case-card {
      flex: 0 0 380px;
      height: 280px;
      border-radius: var(--radius-xl);
      background-size: cover;
      background-position: center;
      position: relative;
      scroll-snap-align: start;
      overflow: hidden;
    }

    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 24px;
      background: linear-gradient(transparent, rgba(0,0,0,0.7));
      color: white;
    }

    .badge-pill {
      background: rgba(255,255,255,0.2);
      backdrop-filter: blur(4px);
      border-radius: 50px;
      padding: 4px 14px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 8px;
    }

    /* 流程重叠卡片 */
    .process-grid {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
    }

    .process-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 28px 24px;
      border: 1px solid var(--border-light);
      margin-right: -20px;
      flex: 1;
      min-width: 200px;
      position: relative;
      z-index: 1;
    }

    .process-card:last-child {
      margin-right: 0;
    }

    @media (max-width: 768px) {
      .process-grid {
        flex-direction: column;
      }
      .process-card {
        margin-right: 0;
        margin-bottom: 16px;
      }
    }

    /* FAQ 手风琴 */
    .faq-accordion .accordion-button {
      background: white;
      border-radius: var(--radius-sm) !important;
      border: 1px solid var(--border-light);
      font-weight: 500;
      box-shadow: none;
    }

    .faq-accordion .accordion-button:not(.collapsed) {
      border-left: 3px solid var(--accent);
      color: var(--primary);
      background: white;
    }

    /* 联系 CTA */
    .cta-dark {
      background: var(--primary);
      color: white;
      border-radius: 0;
    }

    /* 页脚 */
    footer {
      background: #141820;
      color: #a0a5b0;
      padding: 60px 0 20px;
    }

    footer a:hover {
      color: white;
    }

    @media (max-width: 576px) {
      .hero h1 {
        font-size: 1.8rem;
      }
    }