/* roulang page: index */
*, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    :root {
      --bg-deep: #0A0E27;
      --bg-mid: #0F1423;
      --surface-glass: rgba(255, 255, 255, 0.03);
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(168, 85, 247, 0.5);
      --text-primary: #F0F2FF;
      --text-secondary: #B0B8D0;
      --text-muted: #6A6F85;
      --neon-purple: #A855F7;
      --neon-cyan: #00F0FF;
      --gradient-accent: linear-gradient(135deg, #A855F7 0%, #00F0FF 100%);
      --card-radius: 16px;
      --btn-radius: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.4);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-display: "Space Grotesk", "Inter", sans-serif;
      --transition-smooth: all 0.25s ease;
    }
    body {
      background: radial-gradient(circle at 20% 10%, #1A1040 0%, #0A0E27 70%);
      background-attachment: fixed;
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(168, 85, 247, 0.5);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      z-index: 1000;
    }
    .logo {
      font-family: var(--font-display);
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 1px;
      background: var(--gradient-accent);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }
    .nav-links a:hover, .nav-links a.active {
      color: #fff;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -4px;
      width: 0;
      height: 2px;
      background: var(--neon-cyan);
      box-shadow: 0 0 12px var(--neon-cyan);
      transition: width 0.25s;
    }
    .nav-links a:hover::after, .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--gradient-accent);
      border: none;
      padding: 10px 22px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      color: #fff;
      cursor: pointer;
      transition: var(--transition-smooth);
      box-shadow: 0 0 15px rgba(168,85,247,0.4);
      text-decoration: none;
      display: inline-block;
    }
    .nav-cta:hover {
      transform: scale(1.05);
      box-shadow: 0 0 25px rgba(0,240,255,0.6);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--text-primary);
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(10,14,39,0.95);
      backdrop-filter: blur(20px);
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      border-bottom: 1px solid var(--border-glow);
      z-index: 999;
    }
    .mobile-menu a {
      color: var(--text-primary);
      font-size: 1.2rem;
      text-decoration: none;
      font-weight: 500;
    }
    /* Hero */
    .hero {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      min-height: 90vh;
      padding-top: 100px;
    }
    .hero-left h1 {
      font-size: clamp(2.8rem, 5vw, 4.2rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      background: linear-gradient(to right, #fff, #d1c4ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2.2rem;
      max-width: 90%;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--gradient-accent);
      border: none;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      color: #fff;
      cursor: pointer;
      box-shadow: var(--shadow-glow);
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      transform: translateY(-2px) scale(1.03);
      box-shadow: 0 0 30px rgba(0,240,255,0.7);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--neon-cyan);
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      color: var(--neon-cyan);
      cursor: pointer;
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
      border-color: #fff;
      color: #fff;
    }
    .hero-right img {
      width: 100%;
      border-radius: 24px;
      box-shadow: 0 25px 50px -12px rgba(168,85,247,0.3);
      filter: drop-shadow(0 0 30px rgba(0,240,255,0.25));
      animation: float 6s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0); }
    }
    /* 板块通用 */
    section {
      margin: 100px 0;
    }
    h2 {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 2.5rem;
      letter-spacing: -0.5px;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 0;
      width: 60%;
      height: 3px;
      background: var(--gradient-accent);
      border-radius: 2px;
    }
    /* 亮点不对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1.3fr 0.9fr 1fr;
      gap: 24px;
    }
    .feature-card {
      background: var(--surface-glass);
      backdrop-filter: blur(18px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--card-radius);
      padding: 28px 24px;
      transition: var(--transition-smooth);
      box-shadow: var(--shadow-card);
    }
    .feature-card:hover {
      border-color: rgba(255,255,255,0.2);
      transform: translateY(-6px);
      box-shadow: 0 16px 40px rgba(168,85,247,0.2);
    }
    .feature-icon {
      font-size: 2.2rem;
      color: var(--neon-cyan);
      margin-bottom: 1.2rem;
    }
    .feature-card h3 {
      font-size: 1.5rem;
      margin-bottom: 0.8rem;
    }
    /* 案例瀑布 */
    .showcase-masonry {
      columns: 3;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      background: var(--surface-glass);
      backdrop-filter: blur(14px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--card-radius);
      margin-bottom: 24px;
      overflow: hidden;
      transition: all 0.3s;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 20px 35px rgba(0,240,255,0.15);
      border-color: rgba(255,255,255,0.2);
    }
    .case-img {
      width: 100%;
      display: block;
      border-radius: 12px 12px 0 0;
    }
    .case-info {
      padding: 20px;
    }
    .case-tag {
      display: inline-block;
      background: rgba(168,85,247,0.2);
      color: var(--neon-purple);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    /* 对比表 */
    .comparison {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .comp-card {
      background: rgba(255,255,255,0.02);
      border-radius: 20px;
      padding: 32px;
      border: 1px solid var(--border-subtle);
    }
    .comp-card.right {
      background: rgba(168,85,247,0.08);
      border: 1px solid var(--border-glow);
      box-shadow: 0 0 30px rgba(168,85,247,0.2);
    }
    .comp-row {
      display: flex;
      align-items: center;
      gap: 16px;
      margin: 18px 0;
    }
    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(12px);
      border-left: 3px solid transparent;
      margin-bottom: 12px;
      border-radius: 12px;
      transition: 0.2s;
      cursor: pointer;
    }
    .faq-item.active {
      border-left: 3px solid var(--neon-cyan);
      box-shadow: 0 0 18px rgba(0,240,255,0.3);
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 20px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    /* CTA横幅 */
    .cta-banner {
      background: #0A0E27;
      position: relative;
      padding: 80px 24px;
      text-align: center;
      border-radius: 32px;
      overflow: hidden;
    }
    .particle {
      position: absolute;
      width: 6px;
      height: 6px;
      background: var(--neon-cyan);
      border-radius: 50%;
      filter: blur(2px);
      animation: drift 12s infinite alternate;
    }
    @keyframes drift {
      0% { transform: translate(0,0); opacity: 0.3;}
      100% { transform: translate(80px, -60px); opacity: 0.8;}
    }
    /* 页脚 */
    footer {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
      border-top: 1px solid rgba(255,255,255,0.05);
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 18px;
      color: var(--text-secondary);
      transition: 0.2s;
    }
    .social-icons i:hover {
      color: var(--neon-cyan);
      text-shadow: 0 0 12px var(--neon-cyan);
    }
    @media (max-width: 1024px) {
      .hero { grid-template-columns: 1fr; text-align: center; }
      .hero-right { order: -1; }
      .features-grid { grid-template-columns: 1fr 1fr; }
      .showcase-masonry { columns: 2; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .features-grid { grid-template-columns: 1fr; }
      .comparison { grid-template-columns: 1fr; }
      .showcase-masonry { columns: 1; }
      footer { grid-template-columns: 1fr; }
      .container { padding: 0 20px; }
    }