/* roulang page: index */
:root {
      --deep-charcoal: #1A1A1A;
      --burgundy: #8B1E3F;
      --burgundy-hover: #6E1732;
      --warm-bg: #F5F2ED;
      --card-bg: #FFFFFF;
      --border-subtle: #E8E3DC;
      --text-primary: #1A1A1A;
      --text-secondary: #6B6B6B;
      --text-muted: #8A8A8A;
      --text-light: #B0B0B0;
      --white: #FFFFFF;
      --shadow-sm: 0 2px 8px rgba(26, 26, 26, 0.06);
      --shadow-hover: 0 8px 24px rgba(139, 30, 63, 0.12);
      --radius-sm: 4px;
      --radius-xs: 2px;
      --font-serif: 'Noto Serif SC', serif;
      --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --transition-base: 0.25s ease-out;
      --transition-slow: 0.35s ease-out;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    h1, h2, h3 {
      font-family: var(--font-serif);
      font-weight: 700;
    }
    
    a {
      color: var(--burgundy);
      text-decoration: none;
      transition: color var(--transition-base);
    }
    a:hover {
      color: var(--burgundy-hover);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(245, 242, 237, 0.95);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid var(--border-subtle);
      display: flex;
      align-items: center;
    }
    
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    
    .logo {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 20px;
      color: var(--deep-charcoal);
      letter-spacing: 0.5px;
    }
    .logo span {
      color: var(--burgundy);
    }
    
    .nav-links {
      display: flex;
      gap: 40px;
      list-style: none;
    }
    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: #5C5C5C;
      text-transform: uppercase;
      letter-spacing: 0.3px;
      position: relative;
      padding: 4px 0;
      transition: color var(--transition-base);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 1.5px;
      background: var(--burgundy);
      transition: width var(--transition-base);
    }
    .nav-links a:hover {
      color: var(--burgundy);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .btn-primary-sm {
      background: var(--burgundy);
      color: var(--white) !important;
      font-size: 14px;
      font-weight: 600;
      text-transform: uppercase;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      display: inline-block;
      transition: background var(--transition-base), transform var(--transition-base);
      letter-spacing: 0.5px;
      border: none;
      cursor: pointer;
    }
    .btn-primary-sm:hover {
      background: var(--burgundy-hover);
      transform: translateY(-1px);
    }
    
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--deep-charcoal);
    }
    
    /* 按钮系统 */
    .btn-primary {
      background: var(--burgundy);
      color: var(--white);
      font-size: 14px;
      font-weight: 600;
      text-transform: uppercase;
      padding: 16px 40px;
      border-radius: var(--radius-sm);
      display: inline-block;
      transition: background var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
      letter-spacing: 0.5px;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--burgundy-hover);
      transform: translateY(-2px);
      color: var(--white);
      box-shadow: 0 8px 18px rgba(139, 30, 63, 0.25);
    }
    
    .btn-outline {
      background: transparent;
      color: var(--burgundy);
      border: 1.5px solid var(--burgundy);
      font-size: 14px;
      font-weight: 600;
      text-transform: uppercase;
      padding: 16px 40px;
      border-radius: var(--radius-sm);
      display: inline-block;
      transition: all var(--transition-base);
      letter-spacing: 0.5px;
    }
    .btn-outline:hover {
      background: var(--burgundy);
      color: var(--white);
      border-color: var(--burgundy);
    }
    
    .btn-text {
      color: var(--burgundy);
      font-weight: 600;
      font-size: 14px;
      text-decoration: underline;
      text-underline-offset: 4px;
      transition: all var(--transition-base);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-text:hover {
      text-decoration-thickness: 2px;
      color: var(--burgundy-hover);
    }
    .btn-text i {
      transition: transform var(--transition-base);
    }
    .btn-text:hover i {
      transform: translateX(4px);
    }
    
    /* 首屏 */
    #hero {
      padding: 160px 0 120px;
      background-color: var(--warm-bg);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 55% 45%;
      gap: 40px;
      align-items: center;
    }
    .hero-title {
      font-size: 56px;
      line-height: 1.15;
      color: var(--deep-charcoal);
      margin-bottom: 24px;
    }
    .hero-subtitle {
      font-size: 18px;
      line-height: 1.6;
      color: var(--text-secondary);
      max-width: 480px;
      margin-bottom: 40px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      position: relative;
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .data-float {
      position: absolute;
      bottom: 24px;
      right: 24px;
      background: rgba(26, 26, 26, 0.85);
      backdrop-filter: blur(8px);
      color: var(--white);
      padding: 20px 24px;
      border-radius: var(--radius-sm);
      text-align: center;
    }
    .data-float .number {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 700;
      color: #ffffff;
      display: block;
    }
    .data-float .label {
      font-size: 12px;
      text-transform: uppercase;
      letter-spacing: 0.8px;
      opacity: 0.8;
    }
    
    /* 指标看板 */
    #metrics {
      background-color: #EDE9E2;
      padding: 64px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .metric-item .metric-number {
      font-family: var(--font-mono);
      font-size: 36px;
      font-weight: 700;
      color: var(--burgundy);
      display: block;
      line-height: 1.2;
    }
    .metric-item .metric-label {
      font-size: 12px;
      text-transform: uppercase;
      letter-spacing: 0.8px;
      color: var(--text-muted);
      margin-top: 8px;
    }
    
    /* 服务矩阵 */
    #services {
      padding: 120px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 64px;
      font-size: 40px;
      color: var(--deep-charcoal);
    }
    .services-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      margin-bottom: 24px;
    }
    .services-grid.reverse {
      grid-template-columns: 1fr 2fr;
    }
    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      padding: 32px;
      display: flex;
      flex-direction: column;
      transition: box-shadow var(--transition-base), transform var(--transition-base);
      height: 100%;
    }
    .service-card.large {
      min-height: 400px;
    }
    .service-card.small {
      min-height: 280px;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .service-icon {
      font-size: 40px;
      color: var(--burgundy);
      margin-bottom: 24px;
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
    }
    .service-card h3 {
      font-size: 24px;
      margin-bottom: 16px;
    }
    .service-card p {
      color: var(--text-secondary);
      font-size: 15px;
      flex: 1;
      margin-bottom: 24px;
    }
    
    /* 对比区 */
    #compare {
      padding: 100px 0;
      background-color: var(--warm-bg);
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      margin-top: 48px;
    }
    .compare-card {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      padding: 40px;
      border: 1px solid var(--border-subtle);
    }
    .compare-card.traditional {
      background: #f0ede8;
      border-color: #d9d3c9;
    }
    .compare-card.stake {
      background: #fff9fa;
      border-left: 4px solid var(--burgundy);
    }
    .compare-card h3 {
      font-size: 22px;
      margin-bottom: 24px;
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 18px;
      font-size: 15px;
    }
    .compare-list i {
      font-size: 18px;
      width: 24px;
      text-align: center;
    }
    .compare-image img {
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-sm);
    }
    
    /* FAQ */
    #faq {
      padding: 120px 0 100px;
    }
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px 50px;
      margin-top: 48px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 20px 0;
    }
    .faq-question {
      font-size: 18px;
      font-weight: 600;
      color: var(--deep-charcoal);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color var(--transition-base);
    }
    .faq-question i {
      font-size: 20px;
      transition: transform var(--transition-base);
      color: var(--burgundy);
    }
    .faq-answer {
      font-size: 15px;
      color: var(--text-secondary);
      line-height: 1.8;
      max-height: 0;
      overflow: hidden;
      transition: max-height var(--transition-slow), padding var(--transition-slow);
      background: transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 16px;
      background: rgba(237, 233, 226, 0.5);
      margin-top: 8px;
      padding-left: 12px;
      border-radius: 2px;
    }
    .faq-item.active .faq-question i {
      transform: rotate(45deg);
    }
    
    /* 表单区 */
    #contact {
      background: var(--deep-charcoal);
      padding: 80px 0;
      color: var(--white);
    }
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .contact-form input, .contact-form select {
      width: 100%;
      padding: 14px 16px;
      margin-bottom: 20px;
      background: var(--white);
      border: 1px solid #ccc;
      border-radius: var(--radius-xs);
      font-size: 14px;
      transition: border var(--transition-base);
    }
    .contact-form input:focus, .contact-form select:focus {
      border-color: var(--burgundy);
      outline: none;
    }
    .contact-info h3 {
      font-size: 28px;
      margin-bottom: 24px;
    }
    .contact-info ul {
      list-style: none;
      margin-bottom: 32px;
    }
    .contact-info li {
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .trust-badges {
      display: flex;
      gap: 20px;
      font-size: 13px;
      opacity: 0.9;
    }
    
    /* 页脚 */
    .site-footer {
      background: var(--deep-charcoal);
      color: var(--text-light);
      padding: 60px 0 20px;
      border-top: 1px solid #333;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand .logo {
      color: var(--white);
      margin-bottom: 16px;
    }
    .footer-links h4, .footer-contact h4 {
      color: var(--white);
      font-weight: 600;
      margin-bottom: 20px;
      font-size: 14px;
      text-transform: uppercase;
    }
    .footer-links ul, .footer-social ul {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 12px;
    }
    .footer-links a {
      color: var(--text-light);
      font-size: 14px;
    }
    .social-icons {
      display: flex;
      gap: 16px;
      font-size: 20px;
    }
    .copyright {
      border-top: 1px solid #333;
      padding-top: 20px;
      font-size: 12px;
      text-align: center;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid, .contact-grid {
        grid-template-columns: 1fr;
      }
      .hero-image {
        max-width: 500px;
        margin: 0 auto;
      }
      .services-grid, .services-grid.reverse {
        grid-template-columns: 1fr;
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 640px) {
      .nav-links, .header-inner .btn-primary-sm {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .hero-title {
        font-size: 32px;
      }
      .metrics-grid {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }