/* roulang page: index */
:root {
      --primary: #FF6B35;
      --primary-dark: #E55A2B;
      --primary-light: #FF8C5A;
      --secondary: #1B2A4A;
      --success: #00A86B;
      --bg: #FDF8F5;
      --card-bg: #FFFFFF;
      --text-heading: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #8C8C8C;
      --border-light: rgba(27,42,74,0.08);
      --shadow-card: 0 4px 20px rgba(27,42,74,0.06);
      --shadow-hover: 0 8px 30px rgba(27,42,74,0.12);
      --radius-card: 16px;
      --radius-btn: 40px;
      --radius-icon: 50%;
      --space-section: 80px;
      --space-mobile: 48px;
      --container-padding: 40px;
      --nav-height: 72px;
      --mobile-nav-height: 64px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', system-ui, -apple-system, sans-serif;
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-bottom: var(--mobile-nav-height);
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 var(--container-padding);
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    h1, h2, h3 {
      color: var(--text-heading);
      font-weight: 600;
      line-height: 1.3;
    }
    h1 {
      font-size: 40px;
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 32px;
      letter-spacing: -0.3px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
    }
    .text-muted {
      color: var(--text-muted);
      font-size: 14px;
    }
    /* 导航栏 */
    .desktop-nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: var(--nav-height);
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      padding: 0 var(--container-padding);
      transition: background 0.3s, box-shadow 0.3s;
      border-bottom: 1px solid transparent;
    }
    .desktop-nav.scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border-light);
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: var(--mobile-nav-height);
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 -4px 15px rgba(0,0,0,0.04);
      z-index: 110;
      justify-content: space-around;
      align-items: center;
      padding: 0 10px;
      border-top: 1px solid var(--border-light);
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      font-size: 11px;
      color: var(--text-muted);
      transition: color 0.2s;
      font-weight: 500;
    }
    .mobile-nav-item i {
      font-size: 20px;
      color: inherit;
    }
    .mobile-nav-item.active {
      color: var(--primary);
    }
    /* 板块间距 */
    section {
      padding: var(--space-section) 0;
    }
    @media (max-width: 768px) {
      section {
        padding: var(--space-mobile) 0;
      }
      .desktop-nav {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      body {
        padding-bottom: var(--mobile-nav-height);
      }
      .container {
        padding: 0 16px;
      }
      h1 {
        font-size: 30px;
      }
      h2 {
        font-size: 26px;
      }
    }
    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background 0.2s, transform 0.1s;
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 12px rgba(255,107,53,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.2s;
    }
    .btn-outline:hover {
      background: rgba(27,42,74,0.04);
    }
    .btn-white {
      background: white;
      color: var(--primary);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    }
    /* 卡片通用 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    /* Hero */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      min-height: 85vh;
      padding-top: var(--nav-height);
    }
    .hero-text {
      flex: 1;
      position: relative;
      z-index: 2;
    }
    .hero-text h1 {
      margin-bottom: 20px;
    }
    .hero-text p {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      min-height: 420px;
      position: relative;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(27,42,74,0.15);
    }
    .hero-visual::before {
      content: '';
      position: absolute;
      left: -20%;
      top: 0;
      width: 60%;
      height: 100%;
      background: radial-gradient(circle at 30% 50%, rgba(255,107,53,0.25) 0%, transparent 70%);
      pointer-events: none;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        gap: 32px;
        padding-top: 20px;
      }
      .hero-visual {
        width: 100%;
        min-height: 280px;
      }
    }
    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      text-align: center;
      padding: 32px 24px;
    }
    .feature-icon {
      width: 72px;
      height: 72px;
      background: #FFF0E8;
      border-radius: var(--radius-icon);
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      transition: background 0.2s, color 0.2s;
      font-size: 30px;
      color: var(--primary);
    }
    .feature-card:hover .feature-icon {
      background: var(--primary);
      color: white;
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card img {
      border-radius: var(--radius-card) var(--radius-card) 0 0;
      aspect-ratio: 16 / 9;
      object-fit: cover;
      width: 100%;
    }
    .service-content {
      padding: 20px 24px 24px;
    }
    .service-link {
      color: var(--primary);
      font-weight: 600;
      margin-top: 12px;
      display: inline-block;
    }
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .process-steps::before {
      content: '';
      position: absolute;
      top: 24px;
      left: 5%;
      width: 90%;
      height: 2px;
      background: #E0E6ED;
      z-index: 0;
    }
    .step {
      text-align: center;
      flex: 1;
      position: relative;
      z-index: 2;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 12px;
      color: white;
      font-weight: 700;
      font-size: 20px;
    }
    .step-done .step-circle {
      background: white;
      border: 2px solid var(--secondary);
      color: var(--secondary);
    }
    @media (max-width: 768px) {
      .process-steps {
        flex-direction: column;
        gap: 24px;
      }
      .process-steps::before {
        display: none;
      }
    }
    /* 数据案例 */
    .stats-row {
      display: flex;
      gap: 40px;
      align-items: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.1;
    }
    .case-card {
      padding: 24px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      flex: 1;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 16px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
      font-size: 14px;
      margin-top: 8px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
    }
    .faq-item.open {
      border-left: 3px solid var(--primary);
      padding-left: 16px;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #FF6B35 0%, #FF8C5A 100%);
      color: white;
      text-align: center;
      border-radius: 32px;
      padding: 64px 24px;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      background: var(--secondary);
      color: rgba(255,255,255,0.85);
      padding: 60px 0 30px;
      border-radius: 32px 32px 0 0;
    }
    .footer-bottom {
      text-align: center;
      padding: 20px 0;
      background: #151F35;
      color: #AAB4C2;
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .features-grid, .services-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .stats-row {
        flex-direction: column;
      }
    }