/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --deep-space: #0A0410;
      --polar-night: #1A0B2E;
      --stardust-silver: #E0E5FF;
      --neon-cyan: #00F0FF;
      --pulse-orange: #FF6B35;
      --text-muted: #B0B8D1;
      --card-bg: rgba(26, 11, 46, 0.7);
      --card-border: rgba(0, 240, 255, 0.2);
      --gradient-hero: linear-gradient(135deg, #00F0FF, #FF6B35);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(0, 240, 255, 0.1) inset;
      --shadow-hover: 0 16px 48px rgba(0, 240, 255, 0.2), 0 0 0 2px rgba(0,240,255,0.4) inset;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-btn: 50px;
      --font-family: 'Noto Sans SC', 'Alibaba PuHuiTi', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

    body {
      font-family: var(--font-family);
      background-color: var(--deep-space);
      color: var(--text-muted);
      line-height: 1.2;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    h2.block-title {
      font-size: 40px;
      font-weight: 700;
      color: var(--stardust-silver);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
      position: relative;
    }
    h2.block-title::after {
      content: '';
      display: block;
      width: 70px;
      height: 3px;
      background: var(--neon-cyan);
      margin-top: 8px;
      border-radius: 2px;
    }
    .text-center .block-title::after {
      margin-left: auto;
      margin-right: auto;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 4, 16, 0.78);
      backdrop-filter: blur(14px);
      z-index: 1000;
      border-bottom: 1px solid transparent;
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 28px;
      font-weight: 800;
      color: var(--neon-cyan);
      text-decoration: none;
      letter-spacing: 1px;
    }
    .logo-icon {
      font-size: 32px;
      filter: drop-shadow(0 0 10px var(--neon-cyan));
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--stardust-silver);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--neon-cyan);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--neon-cyan);
    }
    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 6px;
    }
    .menu-toggle span {
      width: 25px;
      height: 3px;
      background: var(--neon-cyan);
      border-radius: 3px;
      transition: 0.3s;
    }

    /* 首屏 Hero 左右分栏 */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, #1e1035 0%, #0a0410 80%);
    }
    .hero-content {
      flex: 0 0 55%;
    }
    .hero h1 {
      font-size: 58px;
      font-weight: 900;
      line-height: 1.12;
      color: var(--stardust-silver);
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      background: var(--gradient-hero);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero p {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--neon-cyan);
      color: #0A0410;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: 0.3s;
      font-size: 17px;
      box-shadow: 0 4px 15px rgba(0,240,255,0.4);
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #33F5FF;
      box-shadow: 0 0 24px rgba(0,240,255,0.7);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--neon-cyan);
      color: var(--neon-cyan);
      padding: 12px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.3s;
      text-decoration: none;
    }
    .btn-secondary:hover {
      background: var(--neon-cyan);
      color: #0A0410;
    }
    .btn-ghost {
      color: var(--stardust-silver);
      text-decoration: underline;
      font-weight: 500;
      transition: 0.2s;
    }
    .btn-ghost:hover {
      color: var(--neon-cyan);
    }
    .hero-visual {
      flex: 0 0 45%;
      position: relative;
    }
    .hero-visual img {
      width: 100%;
      filter: drop-shadow(0 0 60px rgba(0,240,255,0.3));
      animation: float 6s ease-in-out infinite;
    }
    @keyframes float {
      0%{transform: translateY(0px);}
      50%{transform: translateY(-18px);}
      100%{transform: translateY(0px);}
    }

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

    /* 解决方案 1+2 错层 */
    .solutions-grid {
      display: flex;
      gap: 28px;
      margin-top: 40px;
      align-items: stretch;
    }
    .solution-large {
      flex: 1.6;
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 40px 32px;
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-card);
      backdrop-filter: blur(6px);
      transition: 0.3s;
    }
    .solution-large:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0,240,255,0.6);
    }
    .solution-small-col {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-card);
      transition: 0.3s;
      height: 100%;
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 14px 38px rgba(0,240,255,0.2);
      border-color: rgba(0,240,255,0.5);
    }
    .card-icon {
      font-size: 32px;
      margin-bottom: 14px;
    }
    .solution-card h3, .solution-large h3 {
      color: var(--neon-cyan);
      font-size: 24px;
      margin-bottom: 10px;
    }
    .btn-ghost-small {
      margin-top: 14px;
      color: var(--neon-cyan);
      font-weight: 600;
    }

    /* 数据板块 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      margin-top: 30px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 52px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--neon-cyan), var(--pulse-orange));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .stat-label {
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 证言横向滚动 */
    .testimonial-scroll {
      display: flex;
      overflow-x: auto;
      gap: 24px;
      padding-bottom: 12px;
      scrollbar-width: thin;
      margin-top: 24px;
    }
    .testimonial-card {
      min-width: 380px;
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 30px;
      border: 1px solid var(--card-border);
      backdrop-filter: blur(4px);
    }
    .testimonial-text {
      font-style: italic;
      color: var(--stardust-silver);
      margin-bottom: 20px;
    }
    .client-info {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--neon-cyan);
    }

    /* FAQ 双列 */
    .faq-grid {
      display: flex;
      gap: 36px;
    }
    .faq-categories {
      flex: 0 0 200px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-cat {
      background: transparent;
      color: var(--text-muted);
      border: none;
      text-align: left;
      padding: 10px 16px;
      border-radius: 8px;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-cat.active {
      background: rgba(0,240,255,0.15);
      color: var(--neon-cyan);
    }
    .faq-answers {
      flex: 1;
    }
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      border: 1px solid var(--card-border);
    }
    .faq-question {
      padding: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--stardust-silver);
    }
    .faq-answer {
      padding: 0 18px 18px;
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }

    .cta-block {
      background: radial-gradient(circle at 40% 20%, #1e1035, #03010a);
      padding: 80px 0;
      text-align: center;
    }
    .footer {
      background: var(--polar-night);
      padding: 60px 0 20px;
      color: var(--stardust-silver);
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 36px;
    }
    .footer-bottom {
      text-align: center;
      margin-top: 44px;
      padding-top: 18px;
      border-top: 1px solid rgba(255,255,255,0.1);
    }

    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        padding: 120px 24px 40px;
      }
      .hero-content, .hero-visual { flex: auto; width: 100%; }
      .solutions-grid { flex-direction: column; }
      .testimonial-card { min-width: 80vw; }
      .faq-grid { flex-direction: column; }
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
    }