/* roulang page: index */
:root {
      --primary: #0A4DA4;
      --primary-dark: #083D82;
      --primary-deep: #062D5E;
      --accent: #F5A623;
      --accent-light: #F7B84D;
      --success: #10B981;
      --white: #FFFFFF;
      --gray-light: #F7F8FA;
      --gray-border: #E8ECF0;
      --text-main: #1A1A1A;
      --text-secondary: #5A5A5A;
      --text-muted: #8A8A8A;
      --text-on-dark: #FFFFFF;
      --footer-text: #B0C4DE;
      --footer-bg: #041F40;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
      --shadow-lg: 0 16px 36px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-container: 16px;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1200px;
      --section-padding: 80px 24px;
      --card-padding: 24px 28px;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    ul {
      list-style: none;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-padding {
      padding: var(--section-padding);
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 48px 16px;
      }
      :root {
        --section-padding: 48px 16px;
      }
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid transparent;
      transition: all 0.3s ease;
      padding: 12px 0;
    }
    .navbar.scrolled {
      background: var(--white);
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
      border-bottom-color: var(--gray-border);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .logo span {
      color: var(--accent);
      font-size: 2rem;
      line-height: 1;
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-menu a {
      font-weight: 500;
      color: var(--text-main);
      font-size: 1rem;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-menu a:hover {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      box-shadow: 0 4px 10px rgba(10,77,164,0.25);
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(10,77,164,0.35);
      color: white;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      transition: var(--transition);
    }
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 30px 24px;
        gap: 24px;
        box-shadow: var(--shadow-md);
        transform: translateY(-150%);
        opacity: 0;
        transition: transform 0.3s ease, opacity 0.3s ease;
        border-radius: 0 0 var(--radius-card) var(--radius-card);
      }
      .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
      }
      .hamburger {
        display: flex;
      }
      .nav-cta {
        align-self: flex-start;
        padding: 12px 28px;
      }
    }
    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(10,77,164,0.25);
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(10,77,164,0.35);
        color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      transition: var(--transition);
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(10,77,164,0.08);
        transform: translateY(-2px);
    }
    .btn-accent {
      background: var(--accent);
      color: var(--text-main);
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
      box-shadow: 0 8px 20px rgba(245,166,35,0.4);
      transition: var(--transition);
        border: none;
        cursor: pointer;
    }
    .btn-accent:hover {
      background: var(--accent-light);
      transform: scale(1.03);
      box-shadow: 0 12px 26px rgba(245,166,35,0.5);
    }
    /* Hero */
    .hero {
      background: var(--white);
      padding: 120px 24px 80px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      gap: 40px;
    }
    .hero-content {
      flex: 1;
    }
    .hero h1 {
      font-size: clamp(2.8rem, 5vw, 3.8rem);
      font-weight: 800;
      line-height: 1.2;
      color: var(--text-main);
      letter-spacing: -0.8px;
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 380px;
      box-shadow: var(--shadow-md);
      position: relative;
      overflow: hidden;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,77,164,0.1) 0%, rgba(6,45,94,0.2) 100%);
      border-radius: 24px;
    }
    @media (max-width: 768px) {
      .hero {
        flex-direction: column-reverse;
        padding: 100px 16px 48px;
        text-align: center;
      }
      .hero-image {
        width: 100%;
        min-height: 260px;
        margin-bottom: 16px;
      }
      .hero-sub {
        max-width: 100%;
      }
    }
    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 24px;
      margin-top: 32px;
    }
    .pain-card {
      background: var(--gray-light);
      padding: var(--card-padding);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .pain-icon {
      font-size: 2rem;
      color: var(--accent);
      margin-bottom: 12px;
    }
    .pain-card h3 {
      font-size: 1.3rem;
      margin-bottom: 8px;
    }
    /* 解决方案 */
    .solution-row {
      display: flex;
      gap: 48px;
      align-items: center;
    }
    .solution-text {
      flex: 1;
    }
    .solution-item {
      margin-bottom: 32px;
    }
    .solution-number {
      font-size: 3rem;
      font-weight: 800;
      color: rgba(10,77,164,0.15);
      margin-bottom: 8px;
    }
    .solution-image {
      flex: 1;
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      border-radius: var(--radius-container);
      min-height: 340px;
      box-shadow: var(--shadow-md);
    }
    @media (max-width: 768px) {
      .solution-row {
        flex-direction: column;
      }
      .solution-image {
        width: 100%;
        min-height: 240px;
      }
    }
    /* 数据卡片 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .stat-card {
      background: linear-gradient(135deg, #0A4DA4 0%, #083D82 100%);
      color: white;
      padding: 32px 20px;
      border-radius: var(--radius-container);
      text-align: center;
      transition: var(--transition);
      box-shadow: 0 8px 20px rgba(10,77,164,0.25);
    }
    .stat-card:hover {
      transform: translateY(-8px);
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-md);
    }
    .quote-icon {
      font-size: 2rem;
      color: rgba(245,166,35,0.35);
    }
    .testimonial-text {
      font-style: italic;
      margin: 16px 0;
    }
    @media (max-width: 768px) {
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--gray-border);
      padding: 6px 0;
    }
    .faq-question {
      font-weight: 700;
      padding: 16px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      padding-right: 20px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding-bottom: 16px;
    }
    /* CTA深色区 */
    .cta-dark {
      background: var(--primary-deep);
      color: white;
      text-align: center;
      border-radius: var(--radius-container);
      padding: 64px 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
      background: var(--primary-deep);
      color: var(--footer-text);
      padding: 64px 24px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    .footer-bottom {
      text-align: center;
      padding: 20px;
      background: #041F40;
      color: #8a9bb5;
    }