/* roulang page: index */
:root {
      --primary: #4E6EF2;
      --primary-hover: #3A5CE4;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --bg: #F5F6FA;
      --card-bg: #FFFFFF;
      --text-main: #1F2329;
      --text-secondary: #86909C;
      --border-light: #E5E8EF;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-capsule: 20px;
      --transition: all 0.2s ease-out;
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

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

    body {
      font-family: var(--font-family);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 40px;
      padding-right: 40px;
    }

    @media (max-width: 1024px) {
      .container {
        padding-left: 24px;
        padding-right: 24px;
      }
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 1000;
      height: 64px;
      display: flex;
      align-items: center;
    }
    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 20px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 6px;
      text-decoration: none;
    }
    .logo i {
      color: var(--primary);
      font-size: 22px;
      margin-right: 2px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 14px;
      color: var(--text-main);
      text-decoration: none;
      position: relative;
      padding: 8px 0;
      transition: var(--transition);
      font-weight: 500;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a.active {
      color: var(--primary);
      border-bottom: 2px solid var(--primary);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: var(--transition);
    }
    .mobile-menu {
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      box-shadow: var(--shadow-md);
      padding: 24px 16px;
      display: none;
      flex-direction: column;
      gap: 20px;
      z-index: 999;
      animation: fadeDown 0.2s ease-out;
    }
    .mobile-menu a {
      font-size: 16px;
      color: var(--text-main);
      text-decoration: none;
      font-weight: 500;
      padding: 8px 0;
    }
    @keyframes fadeDown {
      from { opacity: 0; transform: translateY(-8px); }
      to { opacity: 1; transform: translateY(0); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .navbar { height: 56px; }
      .mobile-menu.show { display: flex; }
    }

    /* 区块间距 */
    section {
      padding-top: 80px;
      padding-bottom: 80px;
    }
    @media (max-width: 768px) {
      section {
        padding-top: 48px;
        padding-bottom: 48px;
      }
    }

    h2 {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.5;
      margin-bottom: 8px;
    }
    .section-subtitle {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 40px;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
      box-shadow: 0 2px 8px rgba(78,110,242,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 18px rgba(78,110,242,0.25);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
    }
    .btn-secondary:hover {
      background: rgba(78,110,242,0.04);
    }
    .btn-capsule {
      border-radius: 20px;
    }
    .text-link {
      color: var(--primary);
      text-decoration: none;
      font-weight: 500;
      transition: var(--transition);
    }
    .text-link:hover {
      text-decoration: underline;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-md);
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
    }
    .hero h1 {
      font-size: 28px;
      font-weight: 700;
      line-height: 1.4;
      margin-bottom: 16px;
    }
    .hero-image img {
      width: 100%;
      height: auto;
      border-radius: 16px;
    }

    /* 价值卡片 */
    .value-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    @media (max-width: 768px) {
      .value-grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(78,110,242,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 24px;
      margin-bottom: 16px;
    }

    /* 功能标签切换 */
    .feature-tabs {
      display: grid;
      grid-template-columns: 200px 1fr;
      gap: 32px;
      align-items: start;
    }
    @media (max-width: 768px) {
      .feature-tabs {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }
    .tab-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .tab-item {
      padding: 12px 16px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      border-left: 3px solid transparent;
      cursor: pointer;
      transition: var(--transition);
    }
    .tab-item.active {
      color: var(--primary);
      border-left-color: var(--primary);
      background: rgba(78,110,242,0.04);
    }
    .feature-content {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    /* 场景卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    @media (max-width: 768px) {
      .scenario-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例数据 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }
    .big-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary);
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      font-size: 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--text-main);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.2s ease-out;
      padding: 0 20px;
      color: var(--text-secondary);
      font-size: 14px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* CTA区块 */
    .cta-wrapper {
      background: linear-gradient(180deg, #F5F6FA 0%, rgba(78,110,242,0.04) 100%);
      border-radius: var(--radius-card);
      padding: 60px 40px;
      text-align: center;
    }

    /* 页脚 */
    .footer {
      background: #1F2329;
      color: #86909C;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
    }
    .footer a {
      color: #86909C;
      text-decoration: none;
      transition: var(--transition);
    }
    .footer a:hover {
      color: white;
    }
    .footer-logo {
      color: white;
      font-weight: 700;
      font-size: 20px;
    }