/* roulang page: index */
:root {
      --primary: #0A66C2;
      --neon: #00E5FF;
      --energy: #FF6B35;
      --bg: #F8FAFC;
      --card: #FFFFFF;
      --text-main: #1E293B;
      --text-secondary: #64748B;
      --text-white: #FFFFFF;
      --nav-bg: #0F172A;
      --nav-text: #CBD5E1;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --transition: 200ms ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-top: 72px;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar {
      background-color: var(--nav-bg);
      height: 72px;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      border-bottom: 2px solid var(--neon);
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--neon);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--nav-text);
      font-weight: 500;
      font-size: 15px;
      transition: color var(--transition);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover {
      color: white;
    }
    .nav-links a.active {
      color: var(--neon);
      text-shadow: 0 0 8px rgba(0,229,255,0.5);
    }
    .nav-cta {
      background: transparent;
      border: 1px solid var(--neon);
      color: var(--neon) !important;
      padding: 8px 20px;
      border-radius: 30px;
      transition: all var(--transition);
    }
    .nav-cta:hover {
      background: rgba(0,229,255,0.1);
      box-shadow: 0 0 12px rgba(0,229,255,0.4);
    }
    .hamburger {
      display: none;
      font-size: 24px;
      color: white;
      cursor: pointer;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: rgba(15,23,42,0.97);
      flex-direction: column;
      padding: 40px 24px;
      gap: 24px;
      z-index: 999;
    }
    .mobile-menu a {
      font-size: 20px;
      color: var(--nav-text);
      border-left: 3px solid transparent;
      padding-left: 16px;
    }
    .mobile-menu a.active {
      border-left: 3px solid var(--neon);
      color: var(--neon);
    }
    /* Hero */
    .hero-section {
      padding: 80px 0 80px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 0 0 60%;
    }
    .hero-image {
      flex: 0 0 40%;
    }
    .hero-image img {
      border-radius: 16px;
      box-shadow: var(--shadow-card);
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    h1 {
      font-size: 42px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 90%;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--energy);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: all var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #E55A2B;
      box-shadow: 0 0 0 4px rgba(255,107,53,0.2);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
      display: inline-block;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    /* 亮点网格 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 48px;
      text-align: center;
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--card);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--card);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      aspect-ratio: 16/9;
      overflow: hidden;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 20px;
    }
    .case-tag {
      font-size: 13px;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 8px;
    }
    .case-content h4 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
      position: relative;
    }
    .case-card:hover h4::after {
      content: '';
      display: block;
      width: 40px;
      height: 2px;
      background: var(--neon);
      margin-top: 8px;
    }
    /* 方案对比 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      border: 1px solid transparent;
      position: relative;
      display: flex;
      flex-direction: column;
    }
    .solution-card.recommended {
      border-color: var(--primary);
    }
    .popular-badge {
      background: var(--energy);
      color: white;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      right: 20px;
      font-weight: 600;
    }
    .solution-name {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .solution-list {
      list-style: none;
      margin: 24px 0;
      flex: 1;
    }
    .solution-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .fa-check { color: var(--primary); }
    .fa-times { color: #ccc; }
    .solution-btn {
      margin-top: 20px;
      width: 100%;
    }
    /* FAQ */
    .faq-item {
      background: #F1F5F9;
      border-radius: 8px;
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 16px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: #F1F5F9;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: white;
      padding: 0 20px;
    }
    .faq-answer p {
      padding: 16px 0 16px 20px;
      border-left: 3px solid var(--neon);
      margin: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(90deg, rgba(10,102,194,0.05) 0%, rgba(255,255,255,1) 100%);
      padding: 80px 0;
      text-align: center;
    }
    /* 页脚 */
    .footer {
      background: #1E293B;
      color: #94A3B8;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
    }
    .footer a:hover {
      color: var(--neon);
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      width: 40px;
      height: 40px;
      border: 1px solid #94A3B8;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition);
    }
    .social-icons i:hover {
      border-color: var(--neon);
      color: var(--neon);
    }
    @media (max-width: 1024px) {
      .features-grid, .cases-grid, .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-grid {
        flex-direction: column;
      }
      .hero-text, .hero-image {
        flex: 0 0 100%;
      }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu.active { display: flex; }
      .hero-text h1 { font-size: 36px; }
      .features-grid, .cases-grid, .solutions-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }