/* roulang page: index */
:root {
      --primary: #FF5C00;
      --primary-hover: #E55300;
      --dark: #1A1A1A;
      --gray-bg: #F4F5F7;
      --accent: #00E5A0;
      --white: #FFFFFF;
      --text-dark: #2D2D2D;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --card-bg: #FFFFFF;
      --testimonial-bg: #FAFAFA;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 8px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.1);
      --container-max: 1200px;
      --nav-height: 64px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--gray-bg);
      color: var(--text-dark);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      padding-top: var(--nav-height);
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    button, .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      font-size: 16px;
      border-radius: var(--radius-btn);
      transition: all 0.25s ease;
      cursor: pointer;
      white-space: nowrap;
      font-family: inherit;
    }
    h1, h2, h3 {
      font-weight: 700;
      line-height: 1.25;
    }
    h2 {
      font-size: 28px;
      color: var(--dark);
      margin-bottom: 12px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: var(--white);
      z-index: 1000;
      display: flex;
      align-items: center;
      box-shadow: 0 2px 6px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-dark);
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
      border-bottom: 2px solid transparent;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px !important;
      border-radius: 30px;
      font-weight: 600;
      border: none;
    }
    .nav-cta:hover {
      background: var(--primary-hover);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      cursor: pointer;
      color: var(--dark);
    }
    .mobile-menu {
      position: fixed;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      background: var(--white);
      flex-direction: column;
      padding: 24px;
      box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      display: none;
      z-index: 999;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      padding: 14px 0;
      font-size: 18px;
      border-bottom: 1px solid var(--border-light);
    }
    /* 板块间距 */
    section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 50px;
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, var(--dark) 0%, #2a2a2a 100%);
      color: white;
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 50px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: 40px;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border: none;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 32px;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
    }
    .hero-image {
      flex: 1 1 400px;
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-card);
      min-height: 320px;
    }
    /* 痛点卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--card-bg);
      padding: 28px 22px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 16px;
      align-items: flex-start;
      border-left: 5px solid var(--primary);
    }
    .pain-icon {
      width: 44px;
      height: 44px;
      background: #FFF3EB;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      color: var(--primary);
      flex-shrink: 0;
    }
    .pain-title {
      font-weight: 700;
      font-size: 18px;
      margin-bottom: 6px;
    }
    /* 优势卡片 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--white);
      padding: 32px 20px;
      border-radius: var(--radius-card);
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }
    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 40px;
      margin-bottom: 16px;
    }
    .feature-name {
      font-weight: 700;
      font-size: 18px;
      margin-bottom: 8px;
    }
    /* 服务交替 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 60px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1 1 45%;
      background-size: cover;
      background-position: center;
      border-radius: 16px;
      min-height: 280px;
    }
    .service-text {
      flex: 1 1 45%;
    }
    .tag {
      background: var(--accent);
      color: #1A1A1A;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      display: inline-block;
      margin-bottom: 8px;
    }
    /* 数据 */
    .stats {
      display: flex;
      justify-content: center;
      gap: 60px;
      flex-wrap: wrap;
      margin: 40px 0;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
    }
    .testimonials {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 32px;
    }
    .testimonial-card {
      background: var(--testimonial-bg);
      padding: 24px;
      border-radius: 16px;
    }
    /* FAQ */
    .accordion-item {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: 10px;
      margin-bottom: 10px;
    }
    .accordion-header {
      padding: 16px 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .accordion-body {
      padding: 0 20px 16px;
      display: none;
    }
    .accordion-item.open .accordion-body {
      display: block;
    }
    /* CTA 区 */
    .cta-block {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 20px;
    }
    .btn-light {
      background: white;
      color: var(--primary);
      font-weight: 700;
      padding: 16px 40px;
      border: none;
    }
    .btn-light:hover {
      background: #f0f0f0;
    }
    /* 页脚 */
    .footer {
      background: var(--dark);
      color: #9CA3AF;
      padding: 48px 0 16px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-menu { display: none; }
      .grid-3, .grid-4, .testimonials { grid-template-columns: 1fr; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .hero-content { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      h1 { font-size: 28px!important; }
      h2 { font-size: 22px; }
      .stats { gap: 20px; }
    }