/* roulang page: index */
:root {
      --deep-green: #0A1A0F;
      --copper-gold: #D4AF37;
      --soft-white: #F8F6F2;
      --card-white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-muted: #4A4A4A;
      --border-light: #E0DDD5;
      --shadow-sm: 0 2px 12px rgba(10, 26, 15, 0.06);
      --shadow-hover: 0 8px 24px rgba(10, 26, 15, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --font-numbers: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--soft-white);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }

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

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

    .container {
      max-width: 1140px;
    }

    /* 导航分屏布局 */
    .main-nav {
      position: fixed;
      left: 0;
      top: 0;
      width: 40%;
      height: 100vh;
      background-color: var(--soft-white);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: flex-end;
      padding: 2rem 3rem;
      z-index: 1000;
      border-right: 1px solid var(--border-light);
    }

    .nav-logo {
      font-size: 2rem;
      font-weight: 700;
      color: var(--deep-green);
      letter-spacing: 2px;
      margin-bottom: 2.5rem;
      align-self: flex-end;
    }

    .nav-links {
      list-style: none;
      padding: 0;
      margin: 0;
      text-align: right;
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
    }

    .nav-links a {
      font-size: 1rem;
      font-weight: 500;
      color: var(--text-dark);
      transition: color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--copper-gold);
    }

    .hero-visual {
      margin-left: 40%;
      width: 60%;
      min-height: 100vh;
      background: linear-gradient(90deg, rgba(10, 26, 15, 0.85) 0%, rgba(10, 26, 15, 0.7) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      padding: 0 4rem;
      position: relative;
    }

    .hero-content {
      color: white;
      max-width: 600px;
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.15;
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--copper-gold);
      margin-bottom: 2rem;
      opacity: 0.9;
    }

    .hero-stats {
      display: flex;
      gap: 2rem;
      margin-bottom: 2.5rem;
      flex-wrap: wrap;
    }

    .stat-item {
      font-size: 2rem;
      font-weight: 700;
      color: var(--copper-gold);
      font-family: var(--font-numbers);
    }

    .stat-label {
      font-size: 0.9rem;
      font-weight: 400;
      color: rgba(255, 255, 255, 0.8);
    }

    .btn-primary-custom {
      background-color: var(--deep-green);
      border: 2px solid var(--deep-green);
      color: white;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
    }

    .btn-primary-custom:hover {
      background-color: #06140B;
      border-color: #06140B;
      transform: scale(1.03);
      color: white;
    }

    .btn-outline-custom {
      border: 2px solid var(--deep-green);
      color: var(--deep-green);
      background: transparent;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
    }

    .btn-outline-custom:hover {
      background-color: rgba(10, 26, 15, 0.05);
    }

    .mobile-nav-toggle {
      display: none;
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--deep-green);
      margin-bottom: 1rem;
      text-align: center;
    }

    .section-subtitle {
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }

    /* 功能卡片网格 */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .feature-card {
      background: var(--card-white);
      padding: 2rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      border-left: 4px solid transparent;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-left-color: var(--copper-gold);
    }

    .feature-icon {
      font-size: 2.5rem;
      color: var(--copper-gold);
      margin-bottom: 1.5rem;
    }

    .feature-card h3 {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--deep-green);
    }

    .tech-tag {
      display: inline-block;
      border: 1px solid var(--copper-gold);
      color: var(--deep-green);
      padding: 0.15rem 0.8rem;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
      margin-top: 1rem;
    }

    /* 场景横向滚动 */
    .scenario-scroll {
      display: flex;
      gap: 1.5rem;
      overflow-x: auto;
      padding-bottom: 1rem;
      scrollbar-width: thin;
      -webkit-overflow-scrolling: touch;
    }

    .scenario-scroll::-webkit-scrollbar {
      height: 4px;
    }

    .scenario-scroll::-webkit-scrollbar-thumb {
      background: var(--copper-gold);
      border-radius: 4px;
    }

    .scenario-card {
      flex: 0 0 280px;
      background: var(--card-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .scenario-card:hover {
      box-shadow: var(--shadow-hover);
      border: 1px solid var(--copper-gold);
    }

    .scenario-img {
      height: 160px;
      background-size: cover;
      background-position: center;
    }

    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .case-card {
      background: #F0EFEA;
      border-radius: var(--radius-card);
      padding: 2rem;
      border-left: 4px solid var(--copper-gold);
    }

    .case-metric {
      font-size: 2rem;
      font-weight: 700;
      color: var(--copper-gold);
      font-family: var(--font-numbers);
    }

    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .pricing-card {
      background: var(--card-white);
      padding: 2.5rem 2rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

    .pricing-card.recommended {
      border: 2px solid var(--copper-gold);
      position: relative;
    }

    .badge-recommend {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--copper-gold);
      color: white;
      padding: 0.3rem 1.2rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    .price {
      font-size: 3rem;
      font-weight: 700;
      color: var(--deep-green);
      font-family: var(--font-numbers);
    }

    /* FAQ 手风琴 */
    .accordion-button:not(.collapsed) {
      background-color: #F0EFEA;
      color: var(--deep-green);
      font-weight: 600;
    }

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

    /* CTA 深色区块 */
    .cta-dark {
      background-color: var(--deep-green);
      color: white;
      padding: 80px 0;
    }

    .cta-dark .form-control {
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.3);
      color: white;
    }

    .cta-dark .form-control::placeholder {
      color: rgba(255, 255, 255, 0.6);
    }

    .footer-link {
      color: #ccc;
      transition: color 0.2s;
    }

    .footer-link:hover {
      color: var(--copper-gold);
      text-decoration: underline;
    }

    /* 响应式 */
    @media (max-width: 992px) {
      .main-nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: auto;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        padding: 1rem 2rem;
        background: var(--soft-white);
        border-bottom: 1px solid var(--border-light);
        z-index: 1050;
      }

      .nav-links {
        display: none;
      }

      .mobile-nav-toggle {
        display: block;
        font-size: 1.5rem;
        background: none;
        border: none;
        color: var(--deep-green);
      }

      .mobile-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--soft-white);
        flex-direction: column;
        padding: 2rem;
        display: none;
        z-index: 1040;
      }

      .mobile-menu.active {
        display: flex;
      }

      .hero-visual {
        margin-left: 0;
        width: 100%;
        min-height: 100vh;
        padding: 6rem 2rem 2rem;
      }

      .feature-grid,
      .case-grid,
      .pricing-grid {
        grid-template-columns: 1fr;
      }

      section {
        padding: 60px 0;
      }
    }