/* roulang page: index */
:root {
      --primary: #1B2A4A;
      --primary-light: #2A3F66;
      --accent: #00C2A8;
      --bg-page: #F5F6FA;
      --bg-white: #FFFFFF;
      --bg-light: #F0F2F8;
      --text-main: #1F2329;
      --text-secondary: #4A5360;
      --text-muted: #86909C;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 12px rgba(27,42,74,0.06);
      --shadow-hover: 0 8px 24px rgba(27,42,74,0.10);
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --header-height: 64px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      padding-top: var(--header-height);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: var(--bg-white);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 15px;
      color: var(--text-secondary);
      font-weight: 500;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 10px 20px;
      font-weight: 600;
      font-size: 15px;
      transition: background 0.2s, transform 0.1s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-light);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 10px 20px;
      font-weight: 600;
      font-size: 15px;
      transition: all 0.2s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      white-space: nowrap;
    }
    .btn-outline:hover {
      background: rgba(27,42,74,0.04);
    }
    .btn-large {
      height: 48px;
      padding: 0 24px;
      font-size: 16px;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2.5px;
      background: var(--primary);
      border-radius: 2px;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        display: none;
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: var(--bg-white);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 12px 24px rgba(0,0,0,0.08);
        z-index: 99;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        font-size: 18px;
        font-weight: 500;
        color: var(--text-main);
      }
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 28px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.4;
    }
    .section-sub {
      font-size: 16px;
      color: var(--text-secondary);
      max-width: 700px;
      margin: 0 auto 48px;
      text-align: center;
    }
    .text-center {
      text-align: center;
    }
    /* Hero */
    .hero {
      background: var(--bg-page);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-left p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right img {
      border-radius: 16px;
      box-shadow: 0 20px 30px -10px rgba(0,0,0,0.08);
      width: 100%;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .hero-left h1 {
        font-size: 28px;
      }
      .hero-right {
        order: -1;
      }
    }
    /* 痛点卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(0,194,168,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent);
      font-size: 24px;
    }
    .pain-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .pain-card p {
      color: var(--text-secondary);
      font-size: 14px;
    }
    /* 解决方案 */
    .solution-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
      text-align: center;
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .solution-icon {
      background: var(--primary);
      width: 56px;
      height: 56px;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: white;
      font-size: 26px;
    }
    /* 成果数据 */
    .results-bar {
      background: var(--bg-light);
      border-radius: 20px;
      padding: 48px 24px;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 8px;
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .testimonial-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }
    .avatar {
      width: 56px;
      height: 56px;
      background: #E0E4ED;
      border-radius: 50%;
      flex-shrink: 0;
    }
    .quote {
      font-style: italic;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .author {
      font-weight: 600;
      font-size: 15px;
    }
    .role {
      font-size: 13px;
      color: var(--text-muted);
    }
    /* FAQ */
    .faq-item {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 20px 24px;
      margin-bottom: 12px;
      box-shadow: var(--shadow-card);
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      margin-top: 12px;
      color: var(--text-secondary);
      display: none;
      font-size: 15px;
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* 最终CTA */
    .cta-final {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 0;
      border-radius: 24px;
      margin: 60px 24px;
    }
    .cta-final h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .cta-final p {
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      font-weight: 700;
    }
    /* Footer */
    .footer {
      background: #141E30;
      color: #B0B8C5;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 20px;
      font-size: 16px;
    }
    .footer a {
      color: #B0B8C5;
      display: block;
      margin-bottom: 10px;
      font-size: 14px;
    }
    .footer a:hover {
      color: var(--accent);
    }
    .copyright {
      margin-top: 40px;
      text-align: center;
      font-size: 13px;
      color: #6A737D;
    }
    @media (max-width: 768px) {
      .cards-grid, .testimonial-grid, .stats-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .cta-final {
        margin: 40px 16px;
      }
      section {
        padding: 60px 0;
      }
    }