/* roulang page: index */
:root {
      --primary-purple: #6C3CF0;
      --primary-orange: #FF6A3D;
      --dark-charcoal: #1E1E2A;
      --cold-white: #F8F9FC;
      --victory-green: #00D68F;
      --gray-body: #4A4A5E;
      --gray-light: #9A9AB0;
      --border-light: #E8EAF0;
      --gray-bg: #EDEFF5;
      --white: #FFFFFF;
      --radius-sm: 12px;
      --radius-md: 16px;
      --radius-lg: 20px;
      --radius-btn: 28px;
      --radius-cta: 32px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 28px rgba(108,60,240,0.12);
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--cold-white);
      color: var(--dark-charcoal);
      line-height: 1.5;
      font-size: 15px;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    #nav {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 1px 6px rgba(0,0,0,0.04);
      height: 68px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--dark-charcoal);
    }
    .logo img {
      height: 32px;
      width: auto;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      color: var(--gray-body);
      transition: color var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary-purple);
    }
    .nav-right {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .search-box {
      display: flex;
      align-items: center;
      background: #F0F1F5;
      border-radius: 28px;
      padding: 8px 16px;
      gap: 6px;
      color: var(--gray-light);
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 14px;
      width: 100px;
    }
    .btn-cta-nav {
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-orange));
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      white-space: nowrap;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .btn-cta-nav:hover {
      transform: scale(1.03);
      box-shadow: 0 4px 12px rgba(108,60,240,0.4);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--dark-charcoal);
      border-radius: 2px;
      transition: var(--transition);
    }
    /* Hero */
    #hero {
      display: flex;
      align-items: center;
      min-height: 600px;
      background: var(--white);
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      width: 100%;
      align-items: center;
    }
    .hero-left {
      flex: 55%;
      padding: 60px 0;
    }
    .hero-right {
      flex: 45%;
      position: relative;
      height: 100%;
      min-height: 480px;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-orange));
      border-radius: 24px;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-right img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.25;
      position: absolute;
    }
    .floating-card {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      border-radius: 12px;
      padding: 16px 24px;
      position: relative;
      z-index: 2;
      font-weight: 800;
      font-size: 24px;
      color: var(--dark-charcoal);
      box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    }
    .badge-tag {
      background: var(--primary-purple);
      color: white;
      font-size: 12px;
      font-weight: 500;
      padding: 4px 14px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 16px;
    }
    .hero-left h1 {
      font-size: 32px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--dark-charcoal);
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 17px;
      line-height: 1.6;
      color: #5A5A72;
      max-width: 420px;
      margin-bottom: 28px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-orange));
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      border: none;
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 6px 18px rgba(108,60,240,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-purple);
      color: var(--primary-purple);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: var(--primary-purple);
      color: white;
    }
    /* Highlights */
    #highlights {
      padding: 80px 0;
    }
    .grid-highlights {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .stat-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-size: 44px;
      font-weight: 800;
      color: var(--primary-purple);
    }
    .stat-label {
      font-size: 13px;
      color: var(--gray-light);
      font-weight: 500;
      margin-top: 8px;
    }
    .stat-line {
      width: 24px;
      height: 3px;
      background: linear-gradient(to right, var(--primary-purple), var(--primary-orange));
      margin: 12px auto 0;
      border-radius: 2px;
    }
    .section-title {
      font-size: 26px;
      font-weight: 700;
      color: var(--dark-charcoal);
      margin-bottom: 8px;
      text-align: left;
    }
    .title-deco {
      width: 40px;
      height: 4px;
      background: linear-gradient(to right, var(--primary-purple), var(--primary-orange));
      border-radius: 2px;
      margin-bottom: 40px;
    }
    /* Services 瀑布流 */
    #services {
      padding: 80px 0;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 28px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      height: 180px;
      object-fit: cover;
      width: 100%;
    }
    .service-content {
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .service-content h3 {
      font-size: 18px;
      font-weight: 600;
    }
    .service-content p {
      color: var(--gray-body);
      font-size: 15px;
    }
    .text-link {
      color: var(--primary-purple);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    /* Cases 砖石 */
    #cases {
      padding: 80px 0;
    }
    .cases-masonry {
      columns: 3;
      column-gap: 24px;
    }
    .case-item {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: 14px;
      overflow: hidden;
      position: relative;
    }
    .case-item img {
      width: 100%;
      display: block;
      border-radius: 14px;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.7));
      color: white;
      padding: 20px;
      font-weight: 600;
      font-size: 18px;
      opacity: 0;
      transition: opacity 0.3s;
    }
    .case-item:hover .case-overlay {
      opacity: 1;
    }
    .more-link {
      text-align: center;
      margin-top: 30px;
      color: var(--primary-purple);
      font-weight: 600;
    }
    /* Compare */
    #compare {
      background: #EDEFF5;
      padding: 80px 0;
    }
    .compare-wrapper {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0;
      position: relative;
    }
    .compare-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 36px;
      flex: 1;
      box-shadow: var(--shadow-sm);
    }
    .compare-card.recommend {
      border: 2px solid var(--primary-purple);
    }
    .vs-badge {
      width: 64px;
      height: 64px;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-orange));
      color: white;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.15);
      z-index: 2;
      margin: 0 -20px;
    }
    .feature-list {
      list-style: none;
      margin: 24px 0;
    }
    .feature-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .check-green { color: var(--victory-green); font-weight: bold; }
    .cross-gray { color: #ccc; }
    .tag-recommend {
      background: var(--primary-purple);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
    }
    /* FAQ */
    #faq {
      padding: 80px 0;
    }
    .faq-item {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--dark-charcoal);
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--gray-body);
      display: none;
      border-top: 1px solid #eee;
      margin-top: 8px;
      padding-top: 16px;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-item.open .faq-question {
      color: var(--primary-purple);
    }
    /* CTA */
    #cta {
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-orange));
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    #cta h2 {
      font-size: 28px;
      font-weight: 700;
    }
    #cta p {
      opacity: 0.9;
      margin: 16px 0 32px;
      font-size: 16px;
    }
    .btn-cta-large {
      background: var(--primary-orange);
      color: white;
      border: none;
      padding: 18px 48px;
      font-size: 18px;
      font-weight: 700;
      border-radius: var(--radius-cta);
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
    }
    .btn-cta-large:hover {
      background: #E55A2B;
      box-shadow: 0 0 20px rgba(255,106,61,0.7);
    }
    /* Footer */
    #footer {
      background: var(--dark-charcoal);
      color: #9A9AB0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }
    .footer-logo {
      font-size: 20px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }
    .footer-links li {
      list-style: none;
      margin-bottom: 8px;
    }
    .footer-links a:hover {
      color: white;
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 12px;
      background: #2a2a3a;
      padding: 10px;
      border-radius: 50%;
      transition: 0.2s;
    }
    .social-icons i:hover {
      background: var(--primary-purple);
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      font-size: 12px;
      color: #6A6A80;
    }
    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .hero-right { width: 100%; min-height: 300px; }
      .grid-highlights { grid-template-columns: repeat(2,1fr); }
      .cases-masonry { columns: 2; }
      .compare-wrapper { flex-direction: column; gap: 30px; }
      .vs-badge { margin: 0; }
    }
    @media (max-width: 767px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .search-box { display: none; }
      .grid-highlights { grid-template-columns: 1fr 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .cases-masonry { columns: 1; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      position: absolute;
      top: 68px;
      left: 0;
      width: 100%;
      padding: 20px;
      box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    }
    .mobile-menu a {
      padding: 12px 0;
      border-bottom: 1px solid #eee;
    }