/* roulang page: index */
:root {
      --primary: #0A4DA4;
      --primary-dark: #06367A;
      --accent: #F5A623;
      --accent-hover: #E09510;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text: #1E293B;
      --text-secondary: #64748B;
      --border: #E2E8F0;
      --radius: 12px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(10,77,164,0.12);
      --transition: 0.3s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      transition: var(--transition);
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
    }

    .header.scrolled {
      background: #ffffff;
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border);
    }

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

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo::before {
      content: "";
      display: inline-block;
      width: 28px;
      height: 28px;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%230A4DA4"><path d="M12 2L15 9H22L16 14L19 21L12 16.5L5 21L8 14L2 9H9L12 2Z"/></svg>') no-repeat center;
      background-size: contain;
    }

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

    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: #475569;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-nav {
      background: var(--accent);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: 6px;
      font-weight: 600;
      margin-left: 8px;
      transition: background 0.2s, transform 0.2s;
    }

    .btn-nav:hover {
      background: var(--accent-hover);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--text);
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      box-shadow: 0 12px 24px rgba(0,0,0,0.08);
      flex-direction: column;
      padding: 32px 24px;
      gap: 28px;
      z-index: 999;
    }

    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
      color: var(--text);
    }

    .mobile-menu .btn-nav {
      text-align: center;
      width: fit-content;
      margin-top: 8px;
    }

    /* 板块间距 */
    section {
      padding: 120px 0;
    }

    @media (max-width: 1024px) {
      section {
        padding: 80px 0;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #F8FAFC 0%, #E8F0FE 100%);
      padding-top: 72px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text);
      line-height: 1.2;
      margin-bottom: 24px;
    }

    .hero-content p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn {
      display: inline-block;
      padding: 16px 40px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 18px;
      text-align: center;
      transition: all 0.3s;
      cursor: pointer;
      border: none;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      box-shadow: 0 4px 12px rgba(245,166,35,0.3);
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 20px rgba(245,166,35,0.5);
      transform: translateY(-2px);
    }

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

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

    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(10,77,164,0.15);
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .pain-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius);
      border-left: 6px solid var(--accent);
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
    }

    .pain-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }

    /* 解决方案错落布局 */
    .solution-layout {
      display: grid;
      grid-template-columns: 1.4fr 1fr;
      gap: 24px;
      margin-top: 40px;
    }

    .solution-main {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .solution-side {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .icon-accent {
      font-size: 32px;
      color: var(--accent);
      margin-bottom: 16px;
    }

    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
      margin-top: 40px;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .testimonial-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius);
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .testimonial-card::before {
      content: "“";
      font-size: 64px;
      color: #E2E8F0;
      position: absolute;
      top: 10px;
      left: 20px;
      line-height: 1;
    }

    .avatar {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      object-fit: cover;
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-list {
      margin-top: 40px;
      border-top: 1px solid var(--border);
    }

    .faq-item {
      border-bottom: 1px solid var(--border);
    }

    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 24px 0;
      font-size: 18px;
      font-weight: 500;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text);
      text-align: left;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: #475569;
      padding-right: 20px;
    }

    .faq-answer.open {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, var(--primary) 0%, #06367A 100%);
      color: white;
      text-align: center;
      border-radius: 0;
    }

    .cta-section h2 {
      color: white;
      margin-bottom: 20px;
    }

    /* 页脚 */
    .footer {
      background: #1E293B;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer a:hover {
      color: var(--accent);
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .btn-group {
        justify-content: center;
      }
      .solution-layout {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .pain-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-content h1 {
        font-size: 32px;
      }
      .btn {
        width: 100%;
        padding: 16px 20px;
      }
      .btn-group {
        flex-direction: column;
      }
    }