/* roulang page: index */
:root {
      --deep-indigo: #1A1A2E;
      --violet-star: #7B2FBE;
      --violet-deep: #6929a8;
      --cold-cyan: #00D9A6;
      --bg-light: #F8F9FC;
      --gray-soft: #F1F3F8;
      --border-light: rgba(0,0,0,0.06);
      --text-primary: #1F2937;
      --text-secondary: #6B7280;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
      --radius-card: 16px;
      --radius-full: 999px;
      --transition: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      line-height: 1.7;
      color: var(--text-primary);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition);
    }

    input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航栏 */
    .nav-glass {
      background: rgba(26, 26, 46, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      height: 72px;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo-text {
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, #7B2FBE 0%, #00D9A6 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }

    .tab-chip-group {
      display: flex;
      gap: 8px;
      align-items: center;
    }

    .tab-chip {
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 15px;
      font-weight: 500;
      color: #ccc;
      transition: var(--transition);
      background: transparent;
      white-space: nowrap;
    }

    .tab-chip:hover {
      background: rgba(255,255,255,0.15);
      color: white;
    }

    .tab-chip.active {
      background: var(--violet-star);
      color: white;
      box-shadow: 0 0 12px rgba(123,47,190,0.6);
    }

    .nav-cta-btn {
      background: var(--violet-star);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 15px;
      border: none;
      box-shadow: 0 4px 12px rgba(123,47,190,0.3);
    }

    .nav-cta-btn:hover {
      background: var(--violet-deep);
      box-shadow: 0 6px 18px rgba(123,47,190,0.5);
    }

    .hamburger {
      display: none;
      font-size: 26px;
      color: white;
      background: none;
      border: none;
    }

    @media (max-width: 1024px) {
      .tab-chip-group {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .nav-cta-btn {
        display: none;
      }
    }

    .mobile-menu {
      display: none;
      flex-direction: column;
      background: rgba(26,26,46,0.96);
      backdrop-filter: blur(20px);
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      padding: 20px;
      z-index: 99;
      gap: 12px;
    }

    .mobile-menu.open {
      display: flex;
    }

    .mobile-menu a {
      color: #ddd;
      font-size: 18px;
      padding: 10px 0;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    /* Hero 区域 */
    .hero-section {
      padding: 140px 0 100px;
      background: radial-gradient(circle at 30% 40%, #1E1E3A, #0F0F20);
      color: white;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-left h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 20px;
      background: linear-gradient(to right, #ffffff, #cbb0f0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: 18px;
      color: #cfcfe0;
      margin-bottom: 40px;
      line-height: 1.6;
    }

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

    .btn-primary {
      background: var(--violet-star);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-full);
      font-weight: 600;
      border: none;
      box-shadow: 0 4px 18px rgba(123,47,190,0.5);
    }

    .btn-primary:hover {
      background: var(--violet-deep);
      box-shadow: 0 6px 24px rgba(123,47,190,0.7);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--violet-star);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-full);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(123,47,190,0.15);
      border-color: #a05ce0;
    }

    .hero-right {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
    }

    .hero-img {
      width: 100%;
      height: auto;
      object-fit: cover;
      border-radius: 24px;
    }

    .star-particle {
      position: absolute;
      background: white;
      border-radius: 50%;
      opacity: 0.5;
      animation: float 4s infinite alternate;
    }

    @keyframes float {
      0% { transform: translateY(0px); opacity: 0.4; }
      100% { transform: translateY(-12px); opacity: 0.8; }
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 32px;
      }
      .hero-btns {
        justify-content: center;
      }
    }

    section {
      padding: 90px 0;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }

    .highlight-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 50px;
    }

    .highlight-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }

    .highlight-card:hover {
      background: #f2eefc;
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }

    .icon-svg {
      font-size: 40px;
      color: var(--cold-cyan);
      margin-bottom: 16px;
    }

    .cases-masonry {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      overflow: hidden;
      transition: 0.4s;
    }

    .case-card:hover {
      box-shadow: var(--shadow-md);
    }

    .case-img {
      height: 220px;
      object-fit: cover;
      transition: 0.4s;
    }

    .case-card:hover .case-img {
      transform: scale(1.03);
    }

    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 48px;
    }

    .compare-col {
      background: #F1F3F8;
      border-radius: var(--radius-card);
      padding: 32px;
    }

    .compare-col.highlight {
      background: #EDE8F7;
    }

    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }

    .faq-item {
      border-bottom: 1px solid #E5E7EB;
      padding: 20px 0;
      cursor: pointer;
    }

    .footer-dark {
      background: #111122;
      color: #ccc;
      padding: 60px 0 20px;
    }

    @media (max-width: 768px) {
      .highlight-grid, .cases-masonry, .compare-wrapper {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 24px;
      }
    }