/* roulang page: index */
:root {
      --primary-green: #00C853;
      --primary-green-glow: #00E676;
      --dark-arena: #0B0F19;
      --darker-bg: #080B12;
      --champion-gold: #FFD600;
      --gray-bg: #F4F6F9;
      --border-light: #E0E6ED;
      --text-secondary: #5A6872;
      --white: #FFFFFF;
      --shadow-card: 0 10px 30px -10px rgba(0,0,0,0.08);
      --shadow-hover: 0 18px 40px -12px rgba(0,0,0,0.15);
      --radius-sm: 4px;
      --radius-md: 8px;
      --transition-base: 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      font-weight: 400;
      line-height: 1.7;
      color: #1e2a3a;
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, .stats-number, .price-number {
      font-weight: 600;
      letter-spacing: -0.02em;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .nova-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(11, 15, 25, 0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 0 24px;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: background 0.3s;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
    }
    .logo-icon {
      font-size: 30px;
      color: var(--primary-green);
      filter: drop-shadow(0 0 6px rgba(0,200,83,0.6));
    }
    .logo-text {
      font-size: 22px;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: #B0B8C1;
      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(--primary-green);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-green);
      border-radius: 2px;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-box {
      background: rgba(255,255,255,0.1);
      border-radius: 20px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: #aaa;
      font-size: 14px;
      border: 1px solid transparent;
      transition: 0.2s;
    }
    .search-box i {
      color: #999;
    }
    .search-box span {
      color: #7f8c9a;
    }
    .login-link {
      color: #ccd6e0;
      font-weight: 500;
      text-decoration: none;
      font-size: 15px;
    }
    .btn-primary {
      background: var(--primary-green);
      color: #0B0F19;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      letter-spacing: 0.5px;
      transition: all 0.25s;
      display: inline-block;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #00E676;
      box-shadow: 0 8px 20px rgba(0,200,83,0.4);
      color: #0B0F19;
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid var(--primary-green);
      color: var(--primary-green);
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      transition: 0.25s;
    }
    .btn-ghost:hover {
      background: rgba(0,200,83,0.1);
      border-color: #00E676;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      color: white;
      background: none;
      border: none;
    }
    /* Hero */
    .hero-section {
      background: var(--dark-arena);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }
    .hero-glow {
      position: absolute;
      top: 10%;
      right: 5%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(0,200,83,0.18) 0%, transparent 70%);
      pointer-events: none;
    }
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero-text h1 {
      font-size: 56px;
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-text .highlight {
      color: var(--primary-green);
    }
    .hero-sub {
      font-size: 18px;
      color: #b0bec5;
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-stats {
      display: flex;
      gap: 40px;
      margin-top: 40px;
    }
    .stat-item .stat-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--champion-gold);
    }
    .stat-label {
      color: #90a4ae;
      font-size: 14px;
    }
    .hero-image {
      flex: 1 1 450px;
    }
    .hero-image img {
      max-width: 100%;
      border-radius: 16px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }
    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-dark {
      background: var(--dark-arena);
      color: white;
    }
    .section-gray {
      background: var(--gray-bg);
    }
    .section-title {
      font-size: 38px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 18px;
      margin-bottom: 48px;
    }
    /* 功能图文环绕 */
    .feature-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-img {
      flex: 1 1 400px;
    }
    .feature-img img {
      width: 100%;
      border-radius: 16px;
      border: 1px solid var(--border-light);
    }
    .feature-desc {
      flex: 1 1 400px;
    }
    .feature-desc h3 {
      font-size: 28px;
      margin-bottom: 16px;
    }
    .feature-desc ul {
      list-style: none;
      padding: 0;
    }
    .feature-desc li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .feature-desc i {
      color: var(--primary-green);
    }
    /* 场景卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }
    .scenario-card {
      background: #1e2530;
      border-radius: var(--radius-md);
      overflow: hidden;
      position: relative;
      height: 280px;
      background-size: cover;
      background-position: center;
    }
    .scenario-overlay {
      background: linear-gradient(0deg, rgba(0,0,0,0.75) 0%, transparent 70%);
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 24px;
      color: white;
    }
    .scenario-overlay h4 {
      font-size: 22px;
      margin-bottom: 8px;
    }
    /* 案例/数据 */
    .client-logos {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 40px;
      filter: grayscale(1);
      opacity: 0.7;
      margin: 30px 0;
    }
    .dashboard-card {
      background: white;
      border-radius: 16px;
      padding: 32px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      align-items: center;
    }
    .chart-preview {
      width: 150px;
      height: 150px;
      border-radius: 50%;
      background: conic-gradient(var(--primary-green) 0% 65%, #e0e6ed 65% 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 28px;
      color: var(--dark-arena);
    }
    /* 定价 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: 0.25s;
    }
    .pricing-card.featured {
      border: 2px solid var(--primary-green);
      box-shadow: 0 15px 35px rgba(0,200,83,0.15);
    }
    .price {
      font-size: 42px;
      font-weight: 700;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-answer.open {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA */
    .cta-dark {
      background: var(--dark-arena);
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .cta-glow {
      position: absolute;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(0,200,83,0.25) 0%, transparent 70%);
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
    }
    /* 页脚 */
    .footer {
      background: #080B12;
      color: #b0bec5;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(160px,1fr));
      gap: 32px;
    }
    .footer a {
      color: #90a4ae;
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--primary-green);
    }
    @media (max-width: 1024px) {
      .hero-text h1 { font-size: 42px; }
      .section-title { font-size: 32px; }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-actions .search-box, .nav-actions .login-link {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-stats {
        justify-content: center;
      }
      .feature-row {
        flex-direction: column;
        text-align: center;
      }
      .feature-row.reverse {
        flex-direction: column-reverse;
      }
    }