/* roulang page: index */
/* 全局设计变量 */
    :root {
      --primary-green: #0A6E3F;
      --primary-green-hover: #085A33;
      --accent-gold: #C8963E;
      --accent-gold-hover: #B07D2E;
      --bg-light: #F7F9FC;
      --bg-white: #FFFFFF;
      --bg-dark: #1E2A2B;
      --bg-footer: #171F20;
      --text-primary: #0B1E1A;
      --text-body: #2D3A3A;
      --text-muted: #5F6C6A;
      --text-on-dark: #FFFFFF;
      --text-on-dark-muted: #E0E8E5;
      --border-light: #E8ECEF;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.03);
      --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
      --radius-md: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "Segoe UI", system-ui, sans-serif;
      --spacing-section: 5rem;
      --max-width: 1200px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      color: var(--primary-green);
      text-decoration: none;
      transition: color 0.2s ease, border-color 0.2s ease;
    }

    a:hover {
      color: var(--primary-green-hover);
      text-decoration: underline;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      outline: none;
      transition: all 0.2s ease;
    }

    .container {
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航 */
    #header-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      z-index: 1000;
      height: 64px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      font-size: 1.35rem;
      color: var(--text-primary);
      text-decoration: none;
    }

    .logo:hover {
      text-decoration: none;
      color: var(--primary-green);
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary-green);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.1rem;
    }

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

    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      text-decoration: none;
      font-size: 0.95rem;
    }

    .nav-links a:hover {
      color: var(--primary-green);
      text-decoration: none;
    }

    .btn-nav-cta {
      background: var(--accent-gold);
      color: white;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-md);
      font-weight: 600;
      text-decoration: none;
      font-size: 0.9rem;
    }

    .btn-nav-cta:hover {
      background: var(--accent-gold-hover);
      text-decoration: none;
      color: white;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 5px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: 0.2s;
    }

    .mobile-menu {
      display: none;
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, #F7F9FC 0%, #EAF4EF 100%);
      padding: 8rem 0 6rem;
      margin-top: 64px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 3rem;
      align-items: center;
    }

    .hero-text h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      color: var(--text-primary);
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }

    .hero-text p {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 2.5rem;
      max-width: 550px;
    }

    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
    }

    .btn-primary {
      background: var(--accent-gold);
      color: white;
      font-weight: 600;
      padding: 0.875rem 2rem;
      border-radius: var(--radius-md);
      text-decoration: none;
      display: inline-block;
      transition: all 0.2s ease;
    }

    .btn-primary:hover {
      background: var(--accent-gold-hover);
      transform: translateY(-1px);
      box-shadow: 0 12px 24px rgba(0,0,0,0.12);
      text-decoration: none;
      color: white;
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary-green);
      color: var(--primary-green);
      font-weight: 600;
      padding: 0.875rem 2rem;
      border-radius: var(--radius-md);
      text-decoration: none;
      display: inline-block;
    }

    .btn-secondary:hover {
      background: var(--primary-green);
      color: white;
      text-decoration: none;
    }

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 360px;
      box-shadow: var(--shadow-card);
    }

    /* 数据看板 */
    #metrics-dashboard {
      background: var(--bg-dark);
      padding: var(--spacing-section) 0;
      color: white;
    }

    #metrics-dashboard h2 {
      color: white;
      text-align: center;
      margin-bottom: 3rem;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      text-align: center;
    }

    .metric-item {
      padding: 1.5rem;
    }

    .metric-number {
      font-family: var(--font-number);
      font-size: clamp(2rem, 4vw, 3rem);
      font-weight: 800;
      color: var(--accent-gold);
      margin-bottom: 0.5rem;
    }

    .metric-label {
      color: rgba(255,255,255,0.75);
      font-size: 0.95rem;
    }

    /* 服务矩阵 */
    #services-matrix {
      padding: var(--spacing-section) 0;
      background: var(--bg-light);
    }

    .section-title {
      font-size: clamp(1.8rem, 3.5vw, 2.5rem);
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 0.75rem;
    }

    .section-subtitle {
      color: var(--text-muted);
      margin-bottom: 3rem;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }

    .service-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      border-left: 3px solid var(--primary-green);
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
    }

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

    .service-icon {
      background: #EAF4EF;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-green);
      margin-bottom: 1.5rem;
      font-size: 1.3rem;
    }

    .service-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
      color: var(--text-primary);
    }

    .service-card p {
      color: var(--text-muted);
      margin-bottom: 1.5rem;
      flex: 1;
    }

    .service-link {
      font-weight: 600;
    }

    /* 对比区 */
    #comparison {
      padding: var(--spacing-section) 0;
      background: var(--bg-white);
    }

    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      margin-top: 2rem;
    }

    .plan-card {
      background: var(--bg-light);
      border-radius: var(--radius-md);
      padding: 2.5rem;
      box-shadow: var(--shadow-card);
      position: relative;
      border: 1px solid var(--border-light);
    }

    .plan-card.recommended {
      border: 2px solid var(--primary-green);
    }

    .plan-badge {
      background: var(--primary-green);
      color: white;
      font-size: 0.8rem;
      font-weight: 600;
      padding: 0.25rem 1rem;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 2rem;
    }

    .plan-name {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
    }

    .plan-price {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-green);
      margin-bottom: 1.5rem;
    }

    .plan-features {
      list-style: none;
      margin-bottom: 2rem;
    }

    .plan-features li {
      margin-bottom: 0.75rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    /* FAQ */
    #faq {
      padding: var(--spacing-section) 0;
      background: var(--bg-light);
    }

    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.25rem 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-muted);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 0.75rem;
    }

    /* CTA */
    #cta-conversion {
      background: var(--bg-dark);
      padding: 5rem 1.5rem;
      text-align: center;
    }

    #cta-conversion h2 {
      color: white;
      margin-bottom: 1rem;
    }

    #cta-conversion p {
      color: rgba(255,255,255,0.7);
      margin-bottom: 2rem;
    }

    .cta-small {
      font-size: 0.85rem;
      margin-top: 1rem;
      color: rgba(255,255,255,0.5);
    }

    /* Footer */
    #footer {
      background: var(--bg-footer);
      color: #9BA5A3;
      padding: 4rem 0 2rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      margin-bottom: 2rem;
    }

    .footer-logo {
      font-weight: 700;
      font-size: 1.2rem;
      color: white;
      margin-bottom: 1rem;
    }

    .footer-links a {
      display: block;
      color: #9BA5A3;
      margin-bottom: 0.5rem;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.9rem;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .comparison-grid { grid-template-columns: 1fr; }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-image { order: -1; min-height: 280px; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: white;
        padding: 2rem;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        flex-direction: column;
        gap: 1.5rem;
        z-index: 999;
      }
      .mobile-menu.active { display: flex; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }