/* roulang page: index */
:root {
      --primary-deep: #0A2E3F;
      --primary-dark: #062433;
      --accent-orange: #F85C3A;
      --accent-hover: #E04A2D;
      --bg-white: #FAFBFD;
      --card-white: #FFFFFF;
      --bg-light: #F0F3F6;
      --text-main: #1E2A32;
      --text-secondary: #5F6B7A;
      --border-light: #E2E8EE;
      --shadow-sm: 0 2px 12px rgba(10,46,63,0.06);
      --shadow-md: 0 8px 28px rgba(10,46,63,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-en: Inter, -apple-system, sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-cn);
      color: var(--text-main);
      background: var(--bg-white);
      line-height: 1.75;
      font-size: 16px;
    }

    h1, h2, h3, .h2, .h3 {
      font-weight: 600;
      line-height: 1.3;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: #FFFFFF;
    }

    h2 {
      font-size: 38px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--primary-deep);
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-main);
    }

    p {
      color: var(--text-secondary);
      margin-bottom: 16px;
    }

    a {
      text-decoration: none;
      color: var(--accent-orange);
      transition: var(--transition);
    }
    a:hover {
      color: var(--accent-hover);
      text-decoration: underline;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--card-white);
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
      height: 72px;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }
    .header .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-deep);
      font-family: var(--font-cn);
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      color: var(--text-main);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
      transition: var(--transition);
      text-decoration: none;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-orange);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-orange);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--accent-orange);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(248,92,58,0.3);
      transition: var(--transition);
      border: none;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-nav:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(248,92,58,0.4);
      color: white !important;
    }
    .btn-nav::after { display: none; }

    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      font-size: 24px;
      color: var(--primary-deep);
      cursor: pointer;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--primary-deep);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 40px;
        z-index: 200;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        color: white;
        font-size: 22px;
      }
      .nav-links .btn-nav {
        background: var(--accent-orange);
        width: 200px;
        text-align: center;
        padding: 14px;
      }
      .menu-toggle {
        display: block;
        z-index: 201;
      }
      .close-menu {
        position: absolute;
        top: 24px;
        right: 24px;
        font-size: 32px;
        color: white;
        background: transparent;
        border: none;
        cursor: pointer;
      }
    }

    /* Hero */
    .hero {
      background: var(--primary-deep);
      position: relative;
      overflow: hidden;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-bg-texture {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.05) 1px, transparent 1px);
      background-size: 40px 40px;
      opacity: 0.6;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-content {
      flex: 1;
    }
    .hero h1 {
      margin-bottom: 20px;
      font-size: 52px;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: 0 8px 20px rgba(248,92,58,0.35);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(248,92,58,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
    }
    .hero-image {
      flex: 1;
      text-align: right;
    }
    .hero-image img {
      border-radius: 16px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }

    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-content {
        order: 1;
      }
      .hero-image {
        order: 2;
        margin-top: 30px;
      }
      h1 {
        font-size: 38px;
      }
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }
    .bg-light {
      background: var(--bg-light);
    }
    .bg-white {
      background: var(--card-white);
    }
    .bg-dark {
      background: var(--primary-deep);
      color: white;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--bg-light);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .pain-card:hover {
      border-color: var(--primary-deep);
    }
    .pain-icon {
      font-size: 32px;
      color: var(--accent-orange);
      margin-bottom: 16px;
    }

    /* 解决方案 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .solution-text {
      flex: 1;
    }
    .solution-img {
      flex: 1;
    }
    .solution-img img {
      border-radius: 16px;
      box-shadow: var(--shadow-md);
    }

    /* 产品卡片 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: var(--transition);
      overflow: hidden;
    }
    .product-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-color: var(--primary-deep);
    }
    .product-img {
      height: 200px;
      background: #E2E8EE;
      overflow: hidden;
    }
    .product-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .product-body {
      padding: 28px;
    }
    .feature-list {
      list-style: none;
      margin: 16px 0;
    }
    .feature-list li {
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-secondary);
    }
    .feature-list i {
      color: var(--accent-orange);
      font-size: 12px;
    }

    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-en);
      font-size: 56px;
      font-weight: 700;
      color: white;
    }
    .stat-label {
      color: rgba(255,255,255,0.8);
      margin-top: 8px;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: var(--card-white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .testimonial-avatar {
      width: 48px;
      height: 48px;
      background: #E2E8EE;
      border-radius: 50%;
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA */
    .cta-band {
      background: var(--accent-orange);
      text-align: center;
      padding: 80px 0;
    }
    .cta-band h2 {
      color: white;
    }
    .btn-white {
      background: white;
      color: var(--primary-deep);
      padding: 14px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      transition: var(--transition);
    }
    .btn-white:hover {
      background: var(--primary-deep);
      color: white;
    }

    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.15);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .product-grid, .pain-grid, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .solution-row {
        flex-direction: column;
      }
    }
    @media (max-width: 768px) {
      .product-grid, .pain-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }