/* roulang page: index */
:root {
      --gold: #C8A45C;
      --gold-hover: #B28E3A;
      --gold-light-bg: #FBF3E2;
      --dark: #1E2126;
      --dark-soft: #2A2E35;
      --bg: #F7F5F0;
      --white: #FFFFFF;
      --gray: #6B7177;
      --gray-light: #E8E3D9;
      --green: #00A86B;
      --orange: #F5A623;
      --red: #E94F37;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.06);
      --shadow-nav: 0 2px 16px rgba(0,0,0,0.08);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-xl: 20px;
      --transition: 200ms ease-out;
      --container: 1200px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--dark);
      line-height: 1.5;
      font-size: 16px;
    }
    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }
    a {
      color: var(--gold);
      text-decoration: none;
      transition: color var(--transition);
    }
    a:hover {
      color: var(--gold-hover);
      text-decoration: underline;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      transition: all var(--transition);
      border-radius: var(--radius-sm);
      padding: 12px 28px;
      font-size: 16px;
    }
    .btn-primary {
      background-color: var(--gold);
      color: var(--white);
    }
    .btn-primary:hover {
      background-color: var(--gold-hover);
      text-decoration: none;
      color: var(--white);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--gold);
      color: var(--gold);
    }
    .btn-outline:hover {
      background-color: var(--gold-light-bg);
      text-decoration: none;
      color: var(--gold-hover);
    }
    h1, h2, h3 {
      font-weight: 600;
    }
    h1 {
      font-size: 44px;
      line-height: 1.2;
      font-weight: 700;
      color: var(--dark);
    }
    h2 {
      font-size: 32px;
      line-height: 1.3;
      color: var(--dark);
    }
    h3 {
      font-size: 20px;
      line-height: 1.4;
      color: var(--dark);
    }
    .section {
      padding: 80px 0;
    }
    .section-dark {
      background-color: var(--dark-soft);
      color: var(--white);
    }
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      border-bottom: 1px solid var(--gray-light);
      z-index: 100;
      box-shadow: var(--shadow-nav);
      transition: box-shadow 0.3s;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--gold);
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 14px;
      color: var(--gray);
      font-weight: 500;
      transition: color var(--transition);
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--gold);
      text-decoration: none;
    }
    .nav-cta {
      background-color: var(--gold);
      color: var(--white) !important;
      padding: 10px 20px !important;
      border-radius: var(--radius-sm);
      font-weight: 600;
    }
    .nav-cta:hover {
      background-color: var(--gold-hover);
      color: var(--white) !important;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      padding: 5px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--dark);
      border-radius: 2px;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--white);
      flex-direction: column;
      padding: 24px;
      gap: 16px;
      border-bottom: 1px solid var(--gray-light);
      box-shadow: var(--shadow-md);
      z-index: 99;
    }
    .mobile-menu a {
      font-size: 16px;
      font-weight: 500;
      color: var(--dark);
    }
    .hero {
      padding: 120px 0 80px;
      background: radial-gradient(circle at 80% 20%, rgba(200,164,92,0.08) 0%, transparent 50%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 16px;
      color: var(--gray);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      background: var(--gray-light);
      border-radius: var(--radius-xl);
      aspect-ratio: 4/3;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      box-shadow: var(--shadow-md);
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .service-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--gold-light-bg);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--gold);
      font-size: 22px;
      margin-bottom: 20px;
    }
    .service-card h3 {
      margin-bottom: 12px;
    }
    .service-card p {
      font-size: 14px;
      color: var(--gray);
    }
    .stats-container {
      background: var(--white);
      border-radius: var(--radius-xl);
      padding: 48px 32px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      box-shadow: var(--shadow-sm);
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--gold);
      line-height: 1.1;
    }
    .stat-label {
      font-size: 14px;
      color: var(--gray);
      margin-top: 8px;
    }
    .stat-desc {
      font-size: 14px;
      color: var(--gray);
      margin-top: 4px;
    }
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .case-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .case-img::after {
      content: '';
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: rgba(200,164,92,0.2);
      opacity: 0;
      transition: opacity var(--transition);
    }
    .case-card:hover .case-img::after {
      opacity: 1;
    }
    .case-content {
      padding: 24px;
    }
    .case-tag {
      display: inline-block;
      background: var(--gold-light-bg);
      color: var(--gold);
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 8px;
    }
    .case-content h3 {
      margin-bottom: 8px;
    }
    .case-content p {
      font-size: 14px;
      color: var(--gray);
    }
    .steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      margin-top: 40px;
      position: relative;
    }
    .step {
      text-align: center;
      position: relative;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      border: 2px solid var(--gold);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 700;
      color: var(--gold);
      background: var(--white);
      margin: 0 auto 20px;
    }
    .step h3 {
      margin-bottom: 8px;
    }
    .step p {
      font-size: 14px;
      color: var(--gray);
    }
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--gray-light);
      padding: 20px 0;
    }
    .faq-question {
      font-size: 16px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--dark);
    }
    .faq-question::before {
      content: '';
      width: 4px;
      height: 20px;
      background: var(--gold);
      border-radius: 2px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      font-size: 14px;
      color: var(--gray);
      padding-left: 16px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .cta-banner {
      padding: 80px 0;
      text-align: center;
      background-color: var(--dark-soft);
    }
    .cta-banner h2 {
      color: var(--white);
      margin-bottom: 16px;
    }
    .cta-sub {
      color: var(--gray-light);
      margin-bottom: 32px;
    }
    .footer {
      background: var(--dark-soft);
      color: var(--gray-light);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--gold);
      margin-bottom: 12px;
    }
    .footer-desc {
      font-size: 14px;
      color: var(--gray);
      line-height: 1.7;
    }
    .footer h4 {
      color: var(--white);
      margin-bottom: 16px;
      font-size: 16px;
    }
    .footer a {
      display: block;
      font-size: 14px;
      color: var(--gray);
      margin-bottom: 10px;
      transition: color var(--transition);
    }
    .footer a:hover {
      color: var(--gold);
      text-decoration: none;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: var(--gray);
    }
    @media (max-width: 1024px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-buttons {
        justify-content: center;
      }
      .hero-image {
        display: none;
      }
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-container {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }
      h1 { font-size: 32px; }
      h2 { font-size: 24px; }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu.active {
        display: flex;
      }
      .services-grid,
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .stats-container {
        grid-template-columns: 1fr;
      }
      .steps {
        grid-template-columns: 1fr;
      }
      .hero-buttons {
        flex-direction: column;
        align-items: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }