/* roulang page: index */
:root {
      --primary-deep: #0F3D3E;
      --accent-gold: #D4A853;
      --bg-warm: #FAF9F6;
      --bg-soft: #F0EFEA;
      --card-bg: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-muted: #555555;
      --text-light-on-dark: #A3C4C5;
      --border-light: rgba(0,0,0,0.06);
      --shadow-sm: 0 2px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --border-radius-card: 12px;
      --transition-smooth: all 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text-dark);
    }

    h2 {
      font-size: 2.4rem;
      margin-bottom: 0.5rem;
    }

    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto 2.5rem auto;
      line-height: 1.6;
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航栏 Mega Menu 风格 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--bg-warm);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: var(--transition-smooth);
      backdrop-filter: blur(5px);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      color: var(--primary-deep);
    }

    .logo-icon {
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .logo-text {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep);
      letter-spacing: -0.3px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-link-item {
      text-decoration: none;
      color: #333;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 0.5rem 0;
      transition: color 0.2s;
    }

    .nav-link-item::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-deep);
      transition: width 0.3s ease;
      transform-origin: left;
    }

    .nav-link-item:hover {
      color: var(--primary-deep);
    }

    .nav-link-item:hover::after {
      width: 100%;
    }

    .btn-nav-cta {
      background: var(--primary-deep);
      color: white;
      border: none;
      padding: 0.5rem 1.5rem;
      border-radius: 8px;
      font-weight: 500;
      transition: var(--transition-smooth);
    }

    .btn-nav-cta:hover {
      background: #0B2F30;
      transform: scale(1.02);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
    }

    /* Hero */
    .hero-section {
      min-height: 90vh;
      background: linear-gradient(180deg, #FAF9F6 0%, #F0EFEA 100%);
      display: flex;
      align-items: center;
      padding-top: 72px;
      position: relative;
      overflow: hidden;
    }

    .hero-graphic {
      position: relative;
      width: 100%;
      height: 400px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .circle-decoration {
      width: 280px;
      height: 280px;
      border: 3px solid var(--primary-deep);
      border-radius: 50%;
      position: absolute;
      opacity: 0.7;
      animation: float 4s ease-in-out infinite;
    }

    .gold-line {
      position: absolute;
      width: 120px;
      height: 2px;
      background: var(--accent-gold);
      transform: rotate(45deg);
      animation: floatLine 4s ease-in-out infinite;
    }

    .triangle-dec {
      width: 0;
      height: 0;
      border-left: 40px solid transparent;
      border-right: 40px solid transparent;
      border-bottom: 70px solid rgba(15,61,62,0.2);
      position: absolute;
      animation: float 5s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }

    @keyframes floatLine {
      0% { transform: rotate(45deg) translateX(0); }
      50% { transform: rotate(45deg) translateX(15px); }
      100% { transform: rotate(45deg) translateX(0); }
    }

    .btn-primary-custom {
      background: var(--primary-deep);
      color: white;
      border: none;
      padding: 0.75rem 2rem;
      border-radius: 8px;
      font-weight: 500;
      transition: var(--transition-smooth);
      border-left: 3px solid var(--accent-gold);
    }

    .btn-primary-custom:hover {
      background: #0B2F30;
      transform: scale(1.02);
      color: white;
    }

    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 0.7rem 1.8rem;
      border-radius: 8px;
      font-weight: 500;
      transition: var(--transition-smooth);
    }

    .btn-outline-custom:hover {
      background: rgba(15,61,62,0.05);
    }

    /* 卡片通用 */
    .card-custom {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      height: 100%;
    }

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

    .advantage-card {
      text-align: center;
      border-bottom: 3px solid transparent;
    }

    .advantage-card:hover {
      border-bottom-color: var(--primary-deep);
      transform: translateY(-4px);
    }

    .icon-gold {
      color: var(--accent-gold);
      font-size: 2.2rem;
    }

    .product-matrix .group-card {
      background: #F5F4F0;
      border-left: 3px solid transparent;
    }

    .product-matrix .group-card:hover {
      background: white;
      border-left-color: var(--accent-gold);
      box-shadow: var(--shadow-hover);
    }

    .scenario-img-placeholder {
      background: #e9e7e0;
      width: 100%;
      height: 260px;
      border-radius: 12px;
      background-size: cover;
      background-position: center;
    }

    .data-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-deep);
      font-family: var(--font-body);
    }

    .accordion-button:not(.collapsed) {
      background-color: rgba(15,61,62,0.03);
      color: var(--primary-deep);
      font-weight: 600;
    }

    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--accent-gold);
    }

    .faq-dot {
      color: var(--accent-gold);
      margin-right: 10px;
    }

    .cta-banner {
      background: var(--primary-deep);
      position: relative;
      overflow: hidden;
    }

    .cta-banner::before {
      content: '';
      position: absolute;
      width: 100%;
      height: 100%;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" opacity="0.05"><path d="M20 20 L80 20 L80 80 L20 80 Z" fill="none" stroke="white" stroke-width="2"/></svg>');
      background-size: 60px;
    }

    .footer-custom {
      background: var(--primary-deep);
      color: var(--text-light-on-dark);
    }

    .footer-link {
      color: var(--text-light-on-dark);
      text-decoration: none;
      transition: color 0.2s;
    }

    .footer-link:hover {
      color: var(--accent-gold);
    }

    @media (max-width: 991px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      h2 {
        font-size: 2rem;
      }
    }

    @media (max-width: 768px) {
      .hero-section {
        text-align: center;
        min-height: auto;
        padding-bottom: 3rem;
      }
      .card-custom:hover {
        transform: none;
        box-shadow: var(--shadow-sm);
      }
      .scenario-img-placeholder {
        height: 200px;
      }
    }