/* roulang page: index */
/* ----- 设计变量与重置 ----- */
    :root {
      --brand-orange: #F15A24;
      --brand-deep: #1E1E1E;
      --bg-warm: #FDF8F3;
      --surface-white: #FFFFFF;
      --accent-gold: #D4AF37;
      --success-green: #2E7D32;
      --alert-red: #C62828;
      --text-primary: #1E1E1E;
      --text-secondary: #4A4A4A;
      --text-muted: #8C7A6B;
      --border-light: rgba(30,30,30,0.08);
      --border-warm: #E5D9D0;
      --shadow-card: 0 8px 24px rgba(30,30,30,0.08);
      --shadow-hover: 0 12px 32px rgba(30,30,30,0.12);
      --shadow-nav: 0 2px 12px rgba(30,30,30,0.05);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-panel: 16px;
      --max-width: 1280px;
      --section-gap: 120px;
      --section-gap-mobile: 80px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
      border: none;
      outline: none;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 字体预设 */
    .font-data {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    /* ----- 组件样式 ----- */
    .btn {
      display: inline-block;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: all 0.25s ease;
      text-align: center;
      background: transparent;
    }
    .btn-primary {
      background: var(--brand-orange);
      color: white;
      box-shadow: 0 4px 12px rgba(241,90,36,0.25);
    }
    .btn-primary:hover {
      background: #E04A1A;
      box-shadow: 0 8px 18px rgba(241,90,36,0.4);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 2px solid var(--text-primary);
      color: var(--text-primary);
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(241,90,36,0.08);
      border-color: var(--brand-orange);
      color: var(--brand-orange);
      transform: translateY(-2px);
    }
    .btn-white {
      background: white;
      color: var(--brand-orange);
      font-weight: 700;
    }
    .btn-white:hover {
      background: #FFF5F0;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .card {
      background: var(--surface-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      height: 100%;
    }
    .card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .gradient-line {
      width: 40px;
      height: 4px;
      background: linear-gradient(90deg, var(--brand-orange), var(--accent-gold));
      border-radius: 2px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(12px);
      z-index: 999;
      transition: box-shadow 0.3s ease, background 0.3s;
      background: var(--surface-white);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--brand-orange);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 2rem;
      line-height: 1;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.2rem;
    }
    .nav-links a {
      color: var(--text-primary);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--brand-orange);
      transition: width 0.2s ease;
    }
    .nav-links a:hover {
      color: var(--brand-orange);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      margin-left: 0.5rem;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      font-size: 1.8rem;
      color: var(--text-primary);
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }
    @media (max-width: 1024px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .site-header {
        background: var(--surface-white);
      }
    }
    @media (max-width: 640px) {
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: var(--surface-white);
        box-shadow: 0 -2px 12px rgba(0,0,0,0.05);
        justify-content: space-around;
        align-items: center;
        padding: 8px 16px;
        height: 64px;
        z-index: 1000;
      }
      .mobile-bottom-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 0.7rem;
        color: var(--text-secondary);
        gap: 4px;
      }
      .mobile-bottom-nav .nav-icon {
        font-size: 1.5rem;
      }
      .mobile-bottom-nav .highlight-cta {
        background: var(--brand-orange);
        color: white;
        border-radius: 40px;
        padding: 10px 16px;
        margin-top: -18px;
        box-shadow: 0 6px 14px rgba(241,90,36,0.4);
        font-weight: 700;
      }
      body {
        padding-bottom: 80px;
      }
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      min-height: 100vh;
      padding-top: 80px;
      gap: 3rem;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      position: relative;
    }
    .hero-img {
      width: 100%;
      height: auto;
      border-radius: 24px;
      object-fit: cover;
      box-shadow: 20px 20px 40px rgba(30,30,30,0.2);
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -0.5px;
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      max-width: 500px;
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 100px;
        min-height: auto;
      }
      .hero-left, .hero-right {
        flex: unset;
        width: 100%;
      }
      .hero h1 {
        font-size: 2.5rem;
      }
    }
    /* 板块通用 */
    .section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 600;
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .section-desc {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 2.5rem;
    }
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--surface-white);
      border: 1px solid var(--border-warm);
      border-radius: var(--radius-panel);
      padding: 28px 24px;
      text-align: left;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--brand-orange);
    }
    .gold-highlight .stat-number {
      color: var(--accent-gold);
    }
    @media (max-width: 768px) {
      .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    /* 服务矩阵交错布局 */
    .services-layout {
      display: grid;
      grid-template-columns: 2fr 4fr 2fr;
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    .service-card.large {
      background: white;
      border-top: 4px solid var(--brand-orange);
    }
    .service-icon {
      font-size: 2rem;
      color: var(--brand-orange);
      margin-bottom: 1rem;
    }
    @media (max-width: 1024px) {
      .services-layout {
        grid-template-columns: 1fr;
      }
    }
    /* 案例对比 */
    .compare-row {
      display: flex;
      gap: 32px;
      margin: 32px 0;
    }
    .compare-col {
      flex: 1;
      background: white;
      padding: 24px;
      border-radius: var(--radius-card);
    }
    .bar {
      height: 10px;
      background: #E0E0E0;
      border-radius: 4px;
      margin: 12px 0;
    }
    .bar-fill {
      height: 100%;
      background: var(--brand-orange);
      width: 87%;
      border-radius: 4px;
    }
    .bar-fill.old {
      background: #BDBDBD;
      width: 52%;
    }
    .case-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .case-card img {
      border-radius: 8px;
    }
    @media (max-width: 768px) {
      .compare-row, .case-cards {
        flex-direction: column;
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      padding: 18px 24px;
      cursor: pointer;
    }
    details summary {
      list-style: none;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #F15A24 0%, #1E1E1E 100%);
      padding: 60px 24px;
      border-radius: 32px;
      text-align: center;
      color: white;
    }
    .footer {
      background: var(--brand-deep);
      color: #E0E0E0;
      padding: 60px 0 30px;
    }
    .footer a:hover {
      color: var(--brand-orange);
    }