/* roulang page: index */
:root {
      --primary: #0A0E27;
      --secondary: #131834;
      --accent-cyan: #00F0FF;
      --accent-magenta: #FF3CAC;
      --accent-orange: #FF8C42;
      --bg-light: #F5F6FA;
      --text-dark: #1A1F36;
      --text-muted: #5A6072;
      --white: #FFFFFF;
      --text-light-muted: #B0B8D1;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.06);
      --card-hover-shadow: 0 8px 30px rgba(0,240,255,0.12);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航栏 */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
      transition: all 0.3s ease;
    }
    header.shrink {
      padding: 8px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
      transition: height 0.3s;
    }
    header.shrink .nav-container {
      height: 60px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--accent-cyan);
      text-decoration: none;
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .logo i {
      margin-right: 6px;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
    }
    .nav-links a {
      color: var(--white);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
      text-shadow: 0 0 8px rgba(0,240,255,0.4);
    }
    .nav-cta {
      background: linear-gradient(135deg, var(--accent-cyan), #0077FF);
      color: var(--white) !important;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(0,240,255,0.25);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 3px;
      background: var(--accent-cyan);
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 39, 0.98);
      backdrop-filter: blur(12px);
      flex-direction: column;
      padding: 20px;
      gap: 16px;
      border-bottom: 1px solid var(--accent-cyan);
      z-index: 999;
    }
    .mobile-menu a {
      color: white;
      text-decoration: none;
      font-size: 1.2rem;
      padding: 10px 0;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    /* Hero */
    .hero {
      background-color: var(--primary);
      background-image: radial-gradient(circle at 20% 30%, rgba(0,240,255,0.05) 0%, transparent 40%);
      padding: 150px 0 100px;
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-text {
      flex: 1;
      color: white;
    }
    .hero h1 {
      font-size: 2.8rem;
      line-height: 1.3;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 1rem;
      color: white;
    }
    .hero .sub {
      font-size: 1.1rem;
      color: var(--text-light-muted);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--accent-cyan), #0077FF);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      text-decoration: none;
      display: inline-block;
      transition: 0.25s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      box-shadow: 0 0 25px rgba(0,240,255,0.5);
      transform: translateY(-2px);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      text-decoration: none;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      color: white;
    }
    .hero-image {
      flex: 1;
      text-align: right;
    }
    .hero-image img {
      max-width: 100%;
      border-radius: 20px;
      box-shadow: 0 15px 30px rgba(0,0,0,0.4);
    }

    /* 通用section */
    section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 2.5rem;
      color: var(--text-dark);
    }

    /* 功能卡片 非对称 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }
    .feature-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      transition: all 0.25s ease;
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    .feature-card.middle {
      margin-top: -20px;
      border-top: 4px solid var(--accent-magenta);
    }
    .icon-box {
      width: 64px;
      height: 64px;
      background: #eef;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      color: var(--accent-cyan);
      margin-bottom: 1.2rem;
    }
    .feature-card h3 {
      font-size: 1.4rem;
      margin-bottom: 0.8rem;
    }

    /* 场景区 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 60px;
    }
    .scene-row.reverse {
      flex-direction: row-reverse;
    }
    .scene-text, .scene-img {
      flex: 1;
    }
    .scene-img img {
      width: 100%;
      border-radius: 20px;
      box-shadow: 0 15px 25px rgba(0,0,0,0.08);
      transition: transform 0.3s;
    }
    .scene-img img:hover {
      transform: scale(1.02);
    }

    /* 数据徽章墙 */
    .stats-wall {
      background: var(--secondary);
      padding: 60px 0;
      text-align: center;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .stat-item {
      color: white;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--accent-magenta), var(--accent-orange));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .stat-label {
      color: var(--text-light-muted);
      margin-top: 8px;
    }

    /* 案例卡片 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 10px;
    }
    .testimonial-card {
      min-width: 300px;
      background: white;
      padding: 24px;
      border-radius: var(--radius-lg);
      border-left: 4px solid var(--accent-cyan);
      box-shadow: var(--card-shadow);
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .price-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      text-align: center;
    }
    .price-card.popular {
      transform: scale(1.03);
      border: 2px solid var(--accent-magenta);
      position: relative;
    }
    .badge {
      background: var(--accent-magenta);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      position: absolute;
      top: -12px;
      right: 20px;
    }
    .price {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--accent-cyan), #0077FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 12px;
      padding: 0 20px;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }
    .faq-item:hover {
      border-left-color: var(--accent-cyan);
    }
    .faq-question {
      font-weight: 600;
      padding: 18px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    /* CTA */
    .cta-banner {
      background: var(--primary);
      background-image: radial-gradient(circle at center, rgba(255,60,172,0.15), transparent);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    footer {
      background: var(--secondary);
      color: var(--text-light-muted);
      padding: 40px 0 20px;
      border-top: 1px solid var(--accent-cyan);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .copyright {
      text-align: center;
      margin-top: 24px;
      font-size: 0.85rem;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .pricing-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-cta { display: none; }
      .hamburger { display: flex; }
      .hero .container { flex-direction: column; }
      .features-grid { grid-template-columns: 1fr; }
      .scene-row, .scene-row.reverse { flex-direction: column; }
      .stats-grid { flex-direction: column; }
      .pricing-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }