/* roulang page: index */
:root {
      --primary: #E8380D;
      --primary-hover: #FF5A2C;
      --accent: #00F0FF;
      --bg-deep: #0D0D14;
      --bg-card: rgba(20, 20, 31, 0.85);
      --bg-nav: rgba(10, 10, 18, 0.92);
      --text-primary: #FFFFFF;
      --text-body: #B0B0C0;
      --text-muted: #6B6B7B;
      --success: #00E676;
      --warning: #FF6D00;
      --border-glow: rgba(0, 240, 255, 0.2);
      --radius: 12px;
      --radius-btn: 6px;
      --transition: 0.3s ease;
      --font-title: 'PingFang SC', 'HarmonyOS Sans', 'Microsoft YaHei', sans-serif;
      --font-body: 'PingFang SC', 'Noto Sans SC', 'Inter', sans-serif;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      background: var(--bg-deep);
      color: var(--text-body);
      font-family: var(--font-body);
      line-height: 1.7;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: var(--text-body);
      transition: color var(--transition);
    }

    a:hover {
      color: var(--accent);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 99;
      background: var(--bg-nav);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-glow);
      height: 72px;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .logo {
      display: flex;
      align-items: baseline;
      gap: 8px;
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 26px;
      color: var(--text-primary);
    }

    .logo .highlight {
      color: var(--accent);
      text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
    }

    .logo small {
      font-size: 14px;
      font-weight: 400;
      color: var(--text-muted);
      letter-spacing: 0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding-bottom: 6px;
      font-size: 16px;
    }

    .nav-links a.active,
    .nav-links a:hover {
      color: #fff;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      box-shadow: 0 0 12px var(--accent);
      transition: width var(--transition);
    }

    .nav-links a.active::after,
    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--primary);
      color: #fff;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background var(--transition), box-shadow var(--transition);
    }

    .nav-cta:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 15px rgba(232, 56, 13, 0.6);
      color: #fff;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 28px;
      cursor: pointer;
    }

    /* Hero */
    #hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(0, 240, 255, 0.06) 0%, transparent 60%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-content {
      flex: 1 1 500px;
    }

    .hero-content h1 {
      font-family: var(--font-title);
      font-size: 56px;
      font-weight: 800;
      line-height: 1.1;
      letter-spacing: -0.5px;
      color: #fff;
      margin-bottom: 24px;
    }

    .hero-content h1 .accent {
      color: var(--accent);
      text-shadow: 0 0 20px rgba(0, 240, 255, 0.7);
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 600px;
    }

    .hero-stats {
      display: flex;
      gap: 40px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .stat-item {
      text-align: left;
    }

    .stat-number {
      font-family: 'DIN Alternate', 'Oswald', sans-serif;
      font-size: 42px;
      font-weight: 700;
      color: var(--success);
      line-height: 1.2;
    }

    .stat-label {
      color: var(--text-muted);
      font-size: 14px;
      text-transform: uppercase;
      letter-spacing: 0.8px;
    }

    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 18px;
      transition: all var(--transition);
      display: inline-block;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 20px rgba(232, 56, 13, 0.7);
      transform: scale(1.03);
      color: #fff;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 14px 38px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 18px;
      transition: all var(--transition);
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
      color: var(--accent);
    }

    .hero-visual {
      flex: 1 1 400px;
      position: relative;
    }

    .hero-visual img {
      border-radius: 20px;
      box-shadow: 0 0 30px rgba(0, 240, 255, 0.25);
    }

    /* 板块通用 */
    section {
      padding: 120px 0;
    }

    .section-title {
      font-family: var(--font-title);
      font-size: 42px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 16px;
      line-height: 1.2;
    }

    .section-desc {
      color: var(--text-muted);
      font-size: 18px;
      max-width: 700px;
      margin-bottom: 60px;
    }

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

    .card {
      background: var(--bg-card);
      border: 1px solid rgba(0, 240, 255, 0.15);
      border-radius: var(--radius);
      padding: 32px;
      transition: all var(--transition);
      backdrop-filter: blur(8px);
    }

    .card:hover {
      border-color: var(--accent);
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.25);
      transform: translateY(-4px);
    }

    .card-icon {
      font-size: 40px;
      color: var(--accent);
      margin-bottom: 20px;
    }

    .card h3 {
      font-family: var(--font-title);
      font-size: 24px;
      font-weight: 600;
      color: #fff;
      margin-bottom: 12px;
    }

    .card p {
      color: var(--text-body);
    }

    .text-link {
      color: var(--accent);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: 16px;
    }

    /* 场景 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
      flex-wrap: wrap;
    }

    .scenario-img {
      flex: 1 1 400px;
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid rgba(0, 240, 255, 0.2);
    }

    .scenario-text {
      flex: 1 1 400px;
    }

    .scenario-text h3 {
      font-size: 32px;
      font-weight: 700;
      color: #fff;
    }

    /* 案例 */
    .case-card {
      background: var(--bg-card);
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid rgba(0, 240, 255, 0.1);
      transition: all var(--transition);
    }

    .case-card:hover {
      border-color: var(--accent);
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.25);
    }

    .case-img img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    .case-body {
      padding: 24px;
    }

    .case-tag {
      background: var(--warning);
      color: #000;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 700;
    }

    .case-highlight {
      font-family: 'DIN Alternate', sans-serif;
      font-size: 32px;
      color: var(--success);
      margin: 12px 0;
    }

    /* 定价 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pricing-card {
      background: var(--bg-card);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: var(--radius);
      padding: 40px 24px;
      text-align: center;
    }

    .pricing-card.featured {
      border: 2px solid var(--accent);
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.2);
    }

    .price {
      font-size: 48px;
      font-weight: 800;
      color: #fff;
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
    }

    .accordion-title {
      font-size: 20px;
      font-weight: 600;
      color: #fff;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      padding-top: 0;
    }

    .accordion-item.active .accordion-content {
      max-height: 300px;
      padding-top: 16px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: radial-gradient(circle at center, rgba(0,240,255,0.08), transparent);
      text-align: center;
      padding: 100px 20px;
    }

    /* 页脚 */
    .site-footer {
      background: #0A0A12;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .grid-3, .pricing-grid { grid-template-columns: repeat(2, 1fr); }
      .hero-content h1 { font-size: 42px; }
    }

    @media (max-width: 640px) {
      .grid-3, .pricing-grid, .footer-grid { grid-template-columns: 1fr; }
      .hero-content h1 { font-size: 36px; }
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .hero-grid { flex-direction: column; }
      .hero-stats { gap: 20px; }
    }