/* roulang page: index */
/* ----- 设计变量 & 重置 ----- */
    :root {
      --primary: #0F4C3A;
      --primary-deep: #0A2E24;
      --primary-light: #1A6B54;
      --accent: #F28C38;
      --accent-hover: #E07B2C;
      --accent-light: #F5A623;
      --bg: #F9FAFB;
      --card-bg: #FFFFFF;
      --text-main: #111827;
      --text-body: #374151;
      --text-muted: #6B7280;
      --text-on-dark: #FFFFFF;
      --text-green-light: #D1FAE5;
      --border-light: #E5E7EB;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 4px 16px rgba(15,76,58,0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-testimonial: 12px;
      --sidebar-width: 240px;
      --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 15px;
      display: flex;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }

    /* 数字专用字体 */
    .data-number, .badge-number {
      font-family: "Inter", "SF Pro Display", system-ui, sans-serif;
      font-weight: 700;
    }

    h1, h2, h3 {
      color: var(--text-main);
      font-weight: 600;
      line-height: 1.3;
    }

    h1 { font-size: 32px; font-weight: 700; }
    h2 { font-size: 24px; }
    h3 { font-size: 18px; }

    a {
      color: inherit;
      text-decoration: none;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

    /* ----- 布局：左侧App Shell + 右侧内容 ----- */
    .app-container {
      display: flex;
      width: 100%;
      min-height: 100vh;
    }

    /* 侧边栏导航 */
    .sidebar {
      width: var(--sidebar-width);
      background: var(--primary-deep);
      color: white;
      display: flex;
      flex-direction: column;
      padding: 2rem 1.2rem;
      position: fixed;
      top: 0;
      left: 0;
      bottom: 0;
      z-index: 100;
      box-shadow: 4px 0 15px rgba(0,0,0,0.08);
      transition: transform 0.3s ease;
    }

    .sidebar-logo {
      text-align: center;
      margin-bottom: 2.5rem;
    }
    .sidebar-logo .brand {
      font-size: 2rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: white;
      display: block;
    }
    .sidebar-logo .slogan {
      font-size: 0.7rem;
      color: var(--text-green-light);
      opacity: 0.8;
      margin-top: 0.2rem;
    }

    .nav-menu {
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }
    .nav-item {
      padding: 0.7rem 1rem;
      border-radius: 6px;
      font-weight: 500;
      color: rgba(255,255,255,0.75);
      transition: var(--transition);
      position: relative;
      font-size: 0.95rem;
      border-left: 3px solid transparent;
    }
    .nav-item:hover {
      color: var(--accent);
      background: rgba(255,255,255,0.05);
    }
    .nav-item.active {
      color: var(--accent);
      border-left: 3px solid var(--accent);
      background: rgba(242,140,56,0.08);
    }

    /* 主内容区 */
    .main-content {
      margin-left: var(--sidebar-width);
      flex: 1;
      width: 100%;
      background: var(--bg);
      overflow-x: hidden;
    }

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

    section {
      padding: 80px 0;
    }

    /* 移动端顶部栏与抽屉 */
    .mobile-header {
      display: none;
      background: var(--primary-deep);
      color: white;
      padding: 1rem 1.2rem;
      align-items: center;
      justify-content: space-between;
      position: sticky;
      top: 0;
      z-index: 90;
    }
    .hamburger {
      font-size: 1.5rem;
      background: none;
      border: none;
      color: white;
      width: 44px;
      height: 44px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: var(--transition);
      box-shadow: 0 4px 10px rgba(242,140,56,0.25);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(242,140,56,0.35);
    }
    .btn-link {
      color: var(--primary);
      font-weight: 500;
      border-bottom: 1px solid transparent;
      transition: var(--transition);
      padding-bottom: 2px;
      display: inline-block;
    }
    .btn-link:hover {
      border-bottom-color: var(--primary);
    }
    .btn-large {
      padding: 16px 40px;
      font-size: 1.1rem;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0F4C3A 0%, #1A6B54 100%);
      color: white;
      padding: 120px 0;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      color: white;
      font-size: 40px;
      margin-bottom: 1rem;
    }
    .hero-sub {
      color: var(--text-green-light);
      font-size: 18px;
      margin-bottom: 2rem;
    }
    .hero-visual {
      flex: 1;
      position: relative;
      min-height: 300px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      box-shadow: 0 20px 30px rgba(0,0,0,0.3);
      display: flex;
      align-items: flex-end;
      justify-content: center;
      padding: 20px;
    }
    .floating-badges {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .badge {
      background: linear-gradient(135deg, #F28C38, #F5A623);
      color: white;
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 0.8rem;
      font-weight: 600;
      white-space: nowrap;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: #F3F4F6;
      padding: 24px;
      border-left: 5px solid var(--accent);
      border-radius: 0 12px 12px 0;
    }
    .pain-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 0.8rem;
    }

    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: var(--transition);
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .solution-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .solution-content {
      padding: 20px 24px 16px;
    }
    .micro-tag {
      color: var(--accent);
      font-weight: 600;
      font-size: 0.9rem;
      margin: 0.5rem 0;
    }

    /* 成果数据墙 */
    .results {
      background: var(--primary-deep);
      color: white;
    }
    .results h2 {
      color: white;
      margin-bottom: 2rem;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .metric-number {
      font-size: 3rem;
      background: linear-gradient(135deg, #F28C38, #F5A623);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .metric-label {
      color: #A7F3D0;
      font-size: 0.9rem;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: white;
      border-radius: var(--radius-testimonial);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .quote-icon {
      font-size: 3rem;
      color: rgba(15,76,58,0.1);
      position: absolute;
      top: 10px;
      left: 20px;
    }
    .quote-text {
      font-style: italic;
      margin: 1rem 0;
      padding-left: 1rem;
      border-left: 3px solid #e5e7eb;
    }
    .avatar-row {
      display: flex;
      align-items: center;
      gap: 0.8rem;
      margin-top: 1rem;
    }
    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background-size: cover;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      background: #F9FAFB;
      transition: var(--transition);
    }
    .faq-question {
      padding: 16px 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: none;
      width: 100%;
      text-align: left;
      color: var(--text-main);
    }
    .faq-answer {
      padding: 0 20px 16px;
      display: none;
      color: #4B5563;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active {
      background: white;
      border-left: 3px solid var(--primary);
    }

    /* CTA Final */
    .cta-final {
      background: linear-gradient(135deg, #0F4C3A, #1A6B54);
      text-align: center;
      color: white;
    }
    .cta-final h2 {
      color: white;
    }

    /* Footer */
    .footer {
      background: var(--primary-deep);
      color: #9CA3AF;
      padding: 40px 0;
    }
    .footer-content {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .sidebar {
        transform: translateX(-100%);
      }
      .sidebar.open {
        transform: translateX(0);
      }
      .main-content {
        margin-left: 0;
      }
      .mobile-header {
        display: flex;
      }
      .hero-grid, .pain-grid, .solution-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      h1 { font-size: 28px; }
      h2 { font-size: 22px; }
      .btn-primary { padding: 12px 24px; }
    }