/* roulang page: index */
:root {
      --primary: #1A3C6E;
      --primary-light: #1F457A;
      --accent: #C9A96E;
      --bg: #F7F9FC;
      --card-white: #FFFFFF;
      --text-primary: #1A3C6E;
      --text-body: #3A4A5C;
      --text-muted: #6B7B8D;
      --shadow-sm: 0 4px 20px rgba(26,60,110,0.06);
      --shadow-hover: 0 12px 32px rgba(26,60,110,0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-capsule: 40px;
      --transition: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Inter, system-ui, -apple-system, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      transition: all var(--transition);
    }

    .container {
      max-width: 1100px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航悬浮胶囊 */
    .main-header {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 48px);
      max-width: 1100px;
      z-index: 1000;
    }

    .nav-capsule {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-capsule);
      padding: 0 24px;
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 8px 24px rgba(26,60,110,0.08);
      border: 1px solid rgba(255,255,255,0.5);
    }

    .logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--primary);
      padding: 6px 0;
      position: relative;
      transition: color var(--transition);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width var(--transition);
    }

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

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

    .nav-links a.active {
      font-weight: 700;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary);
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: 100px;
      padding-bottom: 60px;
    }

    .hero .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      width: 100%;
    }

    .hero-text {
      flex: 0 0 48%;
    }

    .hero-text h1 {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      line-height: 1.3;
      margin-bottom: 20px;
    }

    .hero-text .subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.6;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-size: 16px;
      box-shadow: 0 8px 16px rgba(26,60,110,0.15);
    }

    .btn-primary:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(26,60,110,0.25);
    }

    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-size: 16px;
      background: transparent;
    }

    .btn-outline:hover {
      border-color: var(--accent);
      color: var(--accent);
      transform: translateY(-2px);
    }

    .hero-image {
      flex: 0 0 46%;
    }

    .hero-image img {
      border-radius: 16px;
      box-shadow: 0 20px 40px rgba(26,60,110,0.12);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 板块通用 */
    .section {
      padding: 80px 0;
    }

    .section-title {
      text-align: center;
      font-size: 28px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 12px;
    }

    .section-sub {
      text-align: center;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto 48px;
    }

    /* 核心优势卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      text-align: left;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .feature-icon {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 产品交错布局 */
    .product-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }

    .product-row.reverse {
      flex-direction: row-reverse;
    }

    .product-content {
      flex: 1;
    }

    .product-content h3 {
      font-size: 24px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 12px;
    }

    .product-desc {
      color: var(--text-body);
      margin-bottom: 18px;
    }

    .product-points {
      list-style: none;
      margin-bottom: 20px;
    }

    .product-points li {
      position: relative;
      padding-left: 24px;
      margin-bottom: 8px;
      color: var(--text-body);
      font-size: 15px;
    }

    .product-points li::before {
      content: "●";
      color: var(--accent);
      position: absolute;
      left: 0;
      font-size: 14px;
    }

    .product-image {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .product-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 场景横向滚动 */
    .scenarios-scroll {
      display: flex;
      gap: 20px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
      margin: 0 -4px;
      padding-left: 4px;
    }

    .scenario-card {
      flex: 0 0 280px;
      background: var(--card-white);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      scroll-snap-align: start;
      transition: all var(--transition);
    }

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

    .scenario-img {
      height: 160px;
      background-size: cover;
      background-position: center;
    }

    .scenario-info {
      padding: 20px;
    }

    .scenario-info h4 {
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 6px;
    }

    .scenario-info p {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }

    .case-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 28px;
      display: flex;
      gap: 24px;
      box-shadow: var(--shadow-sm);
    }

    .case-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1;
      min-width: 90px;
    }

    .case-quote {
      font-style: italic;
      color: var(--text-body);
      margin-bottom: 14px;
    }

    .case-tag {
      display: inline-block;
      background: #F0F4FA;
      color: var(--primary);
      border-radius: 20px;
      padding: 4px 14px;
      font-size: 13px;
      font-weight: 500;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid rgba(26,60,110,0.1);
    }

    .faq-question {
      width: 100%;
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 18px 0;
      font-weight: 700;
      font-size: 16px;
      color: var(--primary);
      text-align: left;
      cursor: pointer;
    }

    .faq-icon {
      font-size: 20px;
      transition: transform 0.3s;
      color: var(--accent);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      background: #F0F4FA;
      border-radius: 6px;
      padding: 0 20px;
      margin-bottom: 8px;
      color: var(--text-body);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-final {
      background: #EAF0F8;
      text-align: center;
      padding: 80px 24px;
    }

    .cta-final h2 {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .cta-final p {
      color: var(--text-body);
      margin-bottom: 32px;
    }

    /* 页脚 */
    .main-footer {
      background: var(--primary);
      color: #BCC9DA;
      padding: 60px 0 30px;
    }

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

    .footer-col h4 {
      color: white;
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .footer-col a {
      display: block;
      color: #BCC9DA;
      margin-bottom: 10px;
      font-size: 14px;
    }

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

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .main-header { top: 10px; width: calc(100% - 24px); }
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .hero .container { flex-direction: column; text-align: center; }
      .hero-text { flex: auto; }
      .hero-image { flex: auto; width: 80%; margin-top: 30px; }
      .hero-text h1 { font-size: 26px; }
      .features-grid { grid-template-columns: 1fr; }
      .product-row, .product-row.reverse { flex-direction: column; }
      .cases-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .section { padding: 60px 0; }
    }

    @media (max-width: 520px) {
      .hero-text h1 { font-size: 24px; }
      .btn-primary, .btn-outline { padding: 12px 24px; }
      .footer-grid { grid-template-columns: 1fr; }
    }