/* roulang page: index */
:root {
      --primary: #1A7F3E;
      --primary-deep: #0F5C2A;
      --accent: #F5A623;
      --accent-hover: #E09515;
      --bg-page: #F7F9F5;
      --bg-white: #FFFFFF;
      --text-main: #1D1D1F;
      --text-secondary: #5A5A5A;
      --text-muted: #8E8E93;
      --border-light: #E5E5E5;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.06);
      --transition-smooth: all 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      transition: var(--transition-smooth);
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .header {
      background: var(--bg-white);
      position: sticky;
      top: 0;
      z-index: 50;
      box-shadow: 0 1px 0 rgba(0,0,0,0.04);
      transition: box-shadow 0.3s ease;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .header.scrolled {
      box-shadow: 0 4px 16px rgba(0,0,0,0.04);
    }

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

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .logo span {
      color: var(--text-main);
      font-weight: 600;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      flex-direction: column;
      gap: 5px;
      padding: 8px;
      cursor: pointer;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: 0.3s;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--bg-white);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 55;
      transform: translateX(100%);
      transition: transform 0.35s ease;
    }

    .mobile-menu.active {
      transform: translateX(0);
    }

    .mobile-menu a {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-main);
    }

    .mobile-menu .close-btn {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      font-size: 32px;
      color: var(--text-main);
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--primary-deep);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: #E8F5EC;
    }

    .btn-accent {
      background: var(--accent);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 17px;
    }

    .btn-accent:hover {
      background: var(--accent-hover);
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #F7F9F5 0%, #E8F5EC 100%);
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-text h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-text p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-image {
      background: var(--bg-white);
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.05);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 板块标题 */
    .section-title {
      font-size: 34px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .section-sub {
      font-size: 17px;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }

    /* Features 卡片网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: var(--bg-white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      transition: var(--transition-smooth);
      border: 1px solid transparent;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }

    .feature-icon {
      width: 52px;
      height: 52px;
      background: rgba(26,127,62,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 24px;
    }

    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 10px;
    }

    /* 场景交替 */
    .scenario-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
      margin-bottom: 72px;
    }

    .scenario-img img {
      border-radius: var(--radius-card);
      box-shadow: 0 8px 18px rgba(0,0,0,0.04);
    }

    .scenario-content h3 {
      font-size: 26px;
      font-weight: 700;
      margin-bottom: 18px;
    }

    /* 案例数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-bottom: 48px;
    }

    .stat-card {
      background: var(--bg-white);
      padding: 32px 16px;
      border-radius: var(--radius-card);
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 44px;
      font-weight: 700;
      color: var(--accent);
    }

    .brand-wall {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      justify-content: center;
      opacity: 0.7;
    }

    /* 价格卡 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .pricing-card {
      background: var(--bg-white);
      padding: 36px 28px;
      border-radius: var(--radius-card);
      text-align: center;
      border: 1px solid var(--border-light);
    }

    .pricing-card.popular {
      border: 2px solid var(--primary);
      position: relative;
      transform: scale(1.02);
    }

    .badge {
      background: var(--accent);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 16px;
    }

    .price {
      font-family: var(--font-number);
      font-size: 46px;
      font-weight: 700;
      color: var(--text-main);
    }

    /* FAQ */
    .faq-list {
      max-width: 820px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    .faq-question {
      padding: 18px 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: var(--bg-white);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F9FAFB;
      padding: 0 20px;
    }

    .faq-answer.open {
      max-height: 200px;
      padding: 16px 20px;
    }

    /* CTA 横幅 */
    .cta-band {
      background: linear-gradient(135deg, var(--primary) 0%, #0e4d26 100%);
      padding: 64px 24px;
      text-align: center;
      border-radius: 28px;
      margin: 64px auto;
      color: white;
    }

    .footer {
      background: #1D1D1F;
      color: #CCCCCC;
      padding: 56px 0 32px;
      margin-top: 60px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
    }

    .footer a {
      color: #AAAAAA;
    }
    .footer a:hover {
      color: white;
    }

    @media (max-width: 1024px) {
      .features-grid, .stats-grid, .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-image {
        order: -1;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .section-title { font-size: 28px; }
      .features-grid, .stats-grid, .pricing-grid {
        grid-template-columns: 1fr;
      }
      .scenario-row {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }