/* roulang page: index */
/* :root 设计变量 */
    :root {
      --primary-orange: #F15A24;
      --primary-hover: #E04A10;
      --dark-gray: #2E2E2E;
      --light-gray-bg: #F7F7F7;
      --accent-yellow: #FFC107;
      --white: #FFFFFF;
      --text-main: #333333;
      --text-muted: #6B6B6B;
      --border-light: #E0E0E0;
      --card-shadow: 0 6px 18px rgba(0,0,0,0.06);
      --card-hover-shadow: 0 12px 28px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-btn: 30px;
      --spacing-section: 80px;
      --font-heading: 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

    /* 基础重置与全局样式 */
    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      color: var(--dark-gray);
      margin-top: 0;
    }

    h2 {
      font-size: 2.2rem;
      margin-bottom: 1.2rem;
      letter-spacing: -0.5px;
    }

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

    a:hover {
      color: var(--primary-hover);
      text-decoration: none;
    }

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

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

    /* 按钮全局样式 */
    .btn-primary {
      background: var(--primary-orange);
      color: var(--white);
      font-weight: 700;
      font-size: 1rem;
      padding: 0.9rem 2.3rem;
      border-radius: var(--radius-btn);
      border: none;
      display: inline-block;
      transition: background 0.25s ease, transform 0.2s ease, box-shadow 0.2s;
      box-shadow: 0 4px 10px rgba(241,90,36,0.25);
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      color: var(--white);
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(241,90,36,0.35);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary-orange);
      font-weight: 700;
      font-size: 1rem;
      padding: 0.85rem 2.2rem;
      border-radius: var(--radius-btn);
      border: 2px solid var(--primary-orange);
      display: inline-block;
      transition: all 0.25s ease;
    }

    .btn-outline:hover {
      background: rgba(241,90,36,0.08);
      color: var(--primary-hover);
      border-color: var(--primary-hover);
    }

    .btn-light {
      background: var(--white);
      color: var(--dark-gray);
      font-weight: 700;
      border-radius: 30px;
      padding: 0.8rem 2rem;
      border: none;
      transition: 0.2s;
    }

    .btn-light:hover {
      background: #e9e9e9;
    }

    /* 导航左侧固定栏 */
    .left-nav {
      position: fixed;
      left: 0;
      top: 0;
      height: 100vh;
      width: 260px;
      background-color: var(--dark-gray);
      color: var(--white);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 2rem 1.5rem;
      z-index: 100;
      box-shadow: 4px 0 20px rgba(0,0,0,0.08);
    }

    .logo-area {
      margin-bottom: 2.5rem;
    }

    .logo-text {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .logo-text i {
      color: var(--accent-yellow);
      font-size: 2rem;
    }

    .nav-links {
      list-style: none;
      margin: 0;
      padding: 0;
      display: flex;
      flex-direction: column;
      gap: 1.8rem;
    }

    .nav-links a {
      color: #cccccc;
      font-weight: 500;
      font-size: 1.1rem;
      transition: color 0.2s, padding-left 0.2s;
      display: block;
      padding-left: 0.5rem;
      border-left: 3px solid transparent;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-orange);
      border-left-color: var(--primary-orange);
    }

    .nav-cta {
      margin-top: 2rem;
      width: 100%;
    }

    .nav-cta .btn-primary {
      display: block;
      text-align: center;
      background: var(--primary-orange);
    }

    /* 右侧内容区 */
    .right-content {
      margin-left: 260px;
    }

    /* Hero 区域 */
    .hero-section {
      display: flex;
      align-items: center;
      min-height: 80vh;
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      background-color: rgba(0,0,0,0.45);
      color: white;
      padding: 2rem 3rem;
      position: relative;
    }

    .hero-text {
      max-width: 600px;
    }

    .hero-text h1 {
      font-size: 3.5rem;
      color: white;
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }

    .hero-text .subtitle {
      font-size: 1.25rem;
      margin-bottom: 2.5rem;
      color: rgba(255,255,255,0.9);
    }

    /* 通用板块间距 */
    .section-padding {
      padding: var(--spacing-section) 2rem;
    }

    .bg-light-gray {
      background-color: var(--light-gray-bg);
    }

    /* 卡片样式 */
    .pain-card, .testimonial-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--card-shadow);
      transition: all 0.25s ease;
      height: 100%;
    }

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

    .icon-circle {
      width: 60px;
      height: 60px;
      background: rgba(241,90,36,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      color: var(--primary-orange);
      margin-bottom: 1.5rem;
    }

    /* 解决方案图文 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 3.5rem;
    }

    .solution-img {
      flex: 0 0 40%;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 8px 22px rgba(0,0,0,0.08);
    }

    .solution-text {
      flex: 1;
    }

    .feature-list {
      list-style: none;
      padding-left: 0;
    }

    .feature-list li {
      margin-bottom: 0.8rem;
      display: flex;
      align-items: center;
      gap: 0.6rem;
    }

    .feature-list i {
      color: var(--primary-orange);
      font-size: 1.2rem;
    }

    /* 数据模块 */
    .stat-number {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--accent-yellow);
      line-height: 1.1;
    }

    /* 证言卡片 */
    .testimonial-avatar {
      width: 64px;
      height: 64px;
      background: #ddd;
      border-radius: 50%;
      margin-bottom: 1rem;
    }

    /* FAQ手风琴 */
    .accordion-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }

    .accordion-title {
      font-weight: 700;
      padding: 1.2rem 1.8rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .accordion-content {
      padding: 0 1.8rem 1.5rem;
      display: none;
      color: var(--text-muted);
    }

    .accordion-item.active .accordion-content {
      display: block;
    }

    .accordion-item.active .fa-chevron-down {
      transform: rotate(180deg);
    }

    /* CTA 区块 */
    .cta-dark {
      background: var(--dark-gray);
      color: white;
    }

    /* 页脚 */
    .footer {
      background: var(--dark-gray);
      color: #bbb;
      padding: 3rem 2rem;
    }

    .footer a {
      color: #ccc;
    }

    .footer a:hover {
      color: var(--primary-orange);
    }

    /* 移动端响应式 */
    @media (max-width: 1024px) {
      .left-nav {
        width: 220px;
      }
      .right-content {
        margin-left: 220px;
      }
      .hero-text h1 {
        font-size: 2.8rem;
      }
    }

    @media (max-width: 768px) {
      .left-nav {
        position: relative;
        width: 100%;
        height: auto;
        flex-direction: row;
        flex-wrap: wrap;
        padding: 1rem;
        align-items: center;
      }
      .nav-links {
        flex-direction: row;
        gap: 1.2rem;
      }
      .right-content {
        margin-left: 0;
      }
      .hero-section {
        flex-direction: column;
        padding: 3rem 1.5rem;
        min-height: auto;
      }
      .solution-row {
        flex-direction: column;
      }
      .solution-img {
        flex: 0 0 auto;
        width: 100%;
      }
      h2 {
        font-size: 1.9rem;
      }
    }

    @media (max-width: 520px) {
      .nav-links {
        gap: 0.8rem;
        font-size: 0.9rem;
      }
      .hero-text h1 {
        font-size: 2.2rem;
      }
      .stat-number {
        font-size: 2.4rem;
      }
    }