/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --secondary: #1D3557;
      --accent: #A8DADC;
      --light-bg: #F1FAEE;
      --body-bg: #F8F9FA;
      --card-bg: #FFFFFF;
      --text-main: #2B2B2B;
      --text-muted: #6C757D;
      --border-light: #DEE2E6;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-md: 12px;
      --radius-btn: 8px;
      --max-width: 1200px;
      --transition: 0.25s ease;
      --nav-height: 72px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "Roboto", sans-serif;
      background-color: var(--body-bg);
      color: var(--text-main);
      line-height: 1.8;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      letter-spacing: 0.5px;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-size: 1rem;
      transition: all var(--transition);
      border: none;
      text-align: center;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 12px rgba(230, 57, 70, 0.25);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(230, 57, 70, 0.35);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
    }

    .btn-outline:hover {
      background: var(--secondary);
      color: white;
    }

    h1, h2, h3, .h2, .h3 {
      color: var(--secondary);
      font-weight: 700;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 2.5rem;
      line-height: 1.2;
    }

    h2 {
      font-size: 2rem;
      line-height: 1.3;
      margin-bottom: 0.8em;
    }

    h3 {
      font-size: 1.5rem;
      line-height: 1.4;
      font-weight: 600;
    }

    .text-muted {
      color: var(--text-muted);
      font-size: 0.875rem;
    }

    section {
      padding: 90px 0;
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: white;
      height: var(--nav-height);
      border-bottom: 1px solid #E9ECEF;
      backdrop-filter: blur(6px);
      background: rgba(255,255,255,0.92);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--secondary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: #495057;
      position: relative;
      padding: 8px 0;
      font-size: 1rem;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      width: 0;
      height: 2px;
      bottom: 0;
      left: 50%;
      background: var(--primary);
      transition: all 0.2s ease;
      transform: translateX(-50%);
    }

    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 2px;
      transition: 0.2s;
    }

    .mobile-menu {
      display: none;
    }

    /* Hero */
    .hero {
      background: linear-gradient(90deg, #1D3557 0%, #1D3557 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      min-height: 100vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 400px;
    }
    .hero h1 {
      color: white;
      font-size: 2.8rem;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    .hero-image {
      flex: 1 1 400px;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 30px rgba(0,0,0,0.3);
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }
    .pain-card {
      background: var(--card-bg);
      padding: 32px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 20px;
      align-items: flex-start;
      transition: var(--transition);
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .pain-icon {
      font-size: 2rem;
      color: var(--primary);
      background: #fce4e4;
      padding: 12px;
      border-radius: 12px;
    }

    /* 解决方案混合布局 */
    .solutions-mix {
      display: flex;
      flex-direction: column;
      gap: 70px;
      margin-top: 50px;
    }
    .solution-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 50px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img {
      flex: 1 1 300px;
      border-radius: 20px;
      overflow: hidden;
    }
    .solution-text {
      flex: 1 1 300px;
    }
    .solution-text h3 {
      margin-bottom: 15px;
    }

    /* 数据仪表盘 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-item {
      background: white;
      padding: 32px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
    }

    /* 证言 */
    .testimonials {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 30px;
    }
    .testimonial-card {
      background: white;
      padding: 30px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }
    .testimonial-avatar {
      width: 48px;
      height: 48px;
      background: var(--accent);
      border-radius: 50%;
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 8px;
    }
    .faq-question {
      background: #F8F9FA;
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-radius: 6px;
    }
    .faq-answer {
      padding: 0 20px 20px;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-question {
      background: white;
    }

    /* CTA */
    .cta-band {
      background: var(--secondary);
      color: white;
      text-align: center;
      padding: 80px 20px;
      border-radius: 0;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #CED4DA;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }
    .copyright {
      text-align: center;
      margin-top: 50px;
      color: #ADB5BD;
    }

    @media (max-width: 992px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
      h1 { font-size: 2rem; }
    }
    @media (max-width: 576px) {
      section { padding: 60px 0; }
      .hero h1 { font-size: 1.8rem; }
      .stats-grid { grid-template-columns: 1fr; }
    }