/* roulang page: index */
/* :root 设计变量 */
    :root {
      --primary: #E84A2D;
      --primary-deep: #C13A20;
      --secondary: #1A1A2E;
      --accent: #00C9A7;
      --accent-light: #E6F9F5;
      --bg-light: #F9FAFB;
      --white: #FFFFFF;
      --text-title: #1A1A2E;
      --text-body: #4B5563;
      --text-muted: #9CA3AF;
      --border-light: #E5E7EB;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-xs: 6px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --shadow-lg: 0 15px 40px rgba(0,0,0,0.12);
      --space-section: 100px;
      --space-card: 24px;
      --gradient-primary: linear-gradient(135deg, #E84A2D 0%, #C13A20 100%);
      --gradient-dark: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
      --gradient-cta: linear-gradient(135deg, #E84A2D 0%, #1A1A2E 100%);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-number: 'DIN Alternate', 'PingFang SC', sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-title);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-family: var(--font-title);
      color: var(--text-title);
      font-weight: 600;
      letter-spacing: -0.02em;
    }
    
    a {
      color: var(--primary);
      transition: color 0.2s ease;
    }
    a:hover {
      color: var(--primary-deep);
      text-decoration: none;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, .button {
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    
    /* 容器与间距 */
    .custom-container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    
    .section-padding {
      padding-top: var(--space-section);
      padding-bottom: var(--space-section);
    }
    
    @media (max-width: 768px) {
      :root {
        --space-section: 60px;
      }
    }
    
    /* ===== 导航 sticky header ===== */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 99;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.02);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    .site-header.scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: 0 2px 24px rgba(0,0,0,0.06);
    }
    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      text-decoration: none;
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      color: var(--text-title);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
      text-decoration: none;
      transition: color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary);
      border-radius: 3px;
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta-btn {
      background: var(--primary);
      color: white !important;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(232,74,45,0.25);
      margin-left: 12px;
      text-decoration: none;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .nav-cta-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(232,74,45,0.35);
      color: white !important;
    }
    
    /* 移动端汉堡菜单 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-title);
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: var(--shadow-md);
        border-radius: 0 0 var(--radius-md) var(--radius-md);
      }
      .nav-links.show {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .nav-cta-btn {
        margin-left: 0;
        width: fit-content;
      }
    }
    
    /* ===== Hero 首屏 ===== */
    #hero {
      background: linear-gradient(180deg, #FEFAF9 0%, #F9FAFB 100%);
      padding-top: 120px;
      padding-bottom: 70px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.25;
      margin-bottom: 1.2rem;
      color: var(--secondary);
    }
    .hero-left .subtitle {
      font-size: 1.15rem;
      color: var(--text-body);
      margin-bottom: 2rem;
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      box-shadow: 0 6px 18px rgba(232,74,45,0.3);
      text-decoration: none;
      transition: 0.25s;
    }
    .btn-primary:hover {
      background: var(--primary-deep);
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(232,74,45,0.4);
      color: white;
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(232,74,45,0.05);
      color: var(--primary-deep);
    }
    .hero-right {
      position: relative;
    }
    .dashboard-mock {
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-lg);
      padding: 20px;
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(0,0,0,0.03);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 300px;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      color: white;
      position: relative;
      overflow: hidden;
    }
    .dashboard-mock::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(26,26,46,0.5) 0%, rgba(26,26,46,0.85) 100%);
      border-radius: var(--radius-lg);
    }
    .live-badge {
      position: relative;
      z-index: 2;
      background: var(--accent);
      color: #1A1A2E;
      padding: 6px 14px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 0.85rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      width: fit-content;
      margin-bottom: 12px;
    }
    .score-line {
      position: relative;
      z-index: 2;
      font-size: 2rem;
      font-weight: 700;
      font-family: var(--font-number);
    }
    .hero-badges {
      display: flex;
      gap: 20px;
      margin-top: 30px;
      flex-wrap: wrap;
    }
    .badge-item {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 14px 20px;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 600;
      color: var(--text-title);
    }
    .badge-item i {
      color: var(--accent);
      font-size: 1.4rem;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-left h1 {
        font-size: 2rem;
      }
    }
    
    /* 通用区块标题 */
    .section-title {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--secondary);
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 40px;
    }
    
    /* 卡片通用 */
    .card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: var(--space-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      border: 1px solid var(--border-light);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    
    /* 解决方案图文交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 60px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-text h3 {
      font-size: 1.8rem;
      margin-bottom: 16px;
    }
    .check-list {
      list-style: none;
      padding: 0;
    }
    .check-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
      color: var(--text-body);
    }
    .check-list i {
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
    }
    
    /* 数据徽章 */
    .stat-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 28px 16px;
      text-align: center;
      background: linear-gradient(180deg, #FFFFFF 0%, #FDF8F7 100%);
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .stat-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    
    /* 证言卡片 */
    .testimonial-card {
      background: #F8F9FA;
      border-left: 5px solid var(--primary);
      border-radius: var(--radius-md);
      padding: 24px;
      font-style: italic;
    }
    
    /* FAQ 手风琴定制 */
    .accordion-title {
      font-weight: 600;
      color: var(--text-title);
      border: none;
      background: transparent;
      font-size: 1.1rem;
    }
    .accordion-item.is-active .accordion-title {
      color: var(--primary);
    }
    .accordion-content {
      border-left: 3px solid var(--primary);
      padding-left: 20px;
    }
    
    /* CTA 全宽 */
    .cta-full {
      background: var(--gradient-cta);
      border-radius: var(--radius-lg);
      padding: 70px 30px;
      text-align: center;
      color: white;
    }
    .cta-full h2 {
      color: white;
    }
    .btn-light {
      background: white;
      color: var(--primary);
      padding: 16px 40px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      transition: 0.25s;
    }
    .btn-light:hover {
      transform: scale(1.03);
      box-shadow: 0 0 24px rgba(255,255,255,0.4);
    }
    
    /* 页脚 */
    .site-footer {
      background: var(--secondary);
      color: #9CA3AF;
      padding: 50px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }