/* roulang page: index */
:root {
      --primary: #D4FF00;
      --primary-glow: rgba(212, 255, 0, 0.4);
      --primary-soft: rgba(212, 255, 0, 0.12);
      --accent: #FF3C00;
      --bg-deep: #06090F;
      --bg-card: #0F131C;
      --bg-elevated: #0A0E17;
      --text-primary: #F2F4F8;
      --text-secondary: #8892A6;
      --border-dim: rgba(212, 255, 0, 0.12);
      --border-active: rgba(212, 255, 0, 0.55);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-pill: 50px;
      --shadow-card: 0 8px 32px rgba(212, 255, 0, 0.06), 0 2px 8px rgba(0,0,0,0.6);
      --shadow-nav: 0 1px 0 rgba(212, 255, 0, 0.08), 0 4px 24px rgba(0,0,0,0.8);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
      --transition-out: 0.25s ease-out;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-secondary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition-smooth);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    /* 霓虹发光工具 */
    .neon-glow {
      box-shadow: 0 0 18px var(--primary-glow), 0 0 40px rgba(212,255,0,0.15);
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(6, 9, 15, 0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-dim);
      z-index: 1000;
      box-shadow: var(--shadow-nav);
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
      text-shadow: 0 0 12px rgba(212,255,0,0.5);
    }
    .logo svg {
      width: 28px;
      height: 28px;
      fill: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition-out);
      box-shadow: 0 0 8px var(--primary);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      text-shadow: 0 0 8px rgba(212,255,0,0.5);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 8px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 14px;
      background: transparent;
      transition: var(--transition-smooth);
    }
    .nav-cta:hover {
      background: var(--primary);
      color: #0A0E17;
      box-shadow: 0 0 20px var(--primary-glow);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      transition: 0.3s;
    }
    /* 移动端导航 */
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(6,9,15,0.96);
        backdrop-filter: blur(24px);
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        border-bottom: 1px solid var(--border-dim);
        display: none;
      }
      .mobile-menu.open {
        display: flex;
      }
      .mobile-menu a {
        font-size: 18px;
        font-weight: 600;
        color: var(--text-primary);
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(212,255,0,0.06) 0%, #06090F 80%);
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }
    .hero-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      width: 100%;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-title {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.1;
      letter-spacing: -0.02em;
      background: linear-gradient(135deg, #D4FF00 0%, #FFE600 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 500px;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #0A0E17;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-size: 16px;
      box-shadow: 0 0 16px var(--primary-glow);
      transition: var(--transition-smooth);
    }
    .btn-primary:hover {
      background: white;
      color: #0A0E17;
      box-shadow: 0 0 28px rgba(212,255,0,0.8);
    }
    .btn-outline {
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(212,255,0,0.1);
    }
    .hero-right {
      flex: 0 0 40%;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .stat-card {
      background: rgba(15,19,28,0.8);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-md);
      padding: 20px;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .stat-number {
      font-size: 36px;
      font-weight: 800;
      color: var(--primary);
      font-family: 'Inter', sans-serif;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--primary);
      font-size: 24px;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { opacity: 0.6; transform: translateX(-50%) translateY(0); }
      50% { opacity: 1; transform: translateX(-50%) translateY(6px); }
      100% { opacity: 0.6; transform: translateX(-50%) translateY(0); }
    }
    /* 通用板块 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-size: 40px;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 40px;
      height: 4px;
      background: var(--primary);
      box-shadow: 0 0 12px var(--primary);
    }
    .text-center .section-title::after {
      left: 50%;
      transform: translateX(-50%);
    }
    /* 核心优势 不对称栅格 */
    .features-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 24px;
      margin-top: 40px;
    }
    .feature-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 32px;
      border-left: 4px solid var(--primary);
      transition: var(--transition-smooth);
      box-shadow: 0 4px 12px rgba(0,0,0,0.4);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      border-left-color: var(--accent);
      box-shadow: 0 12px 28px rgba(212,255,0,0.1);
    }
    .feature-icon {
      font-size: 28px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    /* 功能分组左右交替 */
    .feature-alt {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-top: 60px;
    }
    .feature-alt.reverse {
      flex-direction: row-reverse;
    }
    .feature-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-dim);
    }
    .feature-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .feature-text {
      flex: 1;
    }
    /* 使用场景卡片 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .scenario-card {
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-lg);
      height: 320px;
      position: relative;
      overflow: hidden;
      transition: var(--transition-smooth);
      border: 1px solid transparent;
    }
    .scenario-card:hover {
      transform: translateY(-8px);
      border-color: var(--primary);
      box-shadow: 0 0 24px rgba(212,255,0,0.25);
    }
    .scenario-card .overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(6,9,15,0.9) 0%, transparent 70%);
    }
    .scenario-title {
      position: absolute;
      bottom: 24px;
      left: 24px;
      color: white;
      font-weight: 700;
      font-size: 22px;
    }
    /* 成功案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .case-card {
      background: var(--bg-card);
      padding: 28px;
      border-radius: var(--radius-lg);
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .case-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--primary);
    }
    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .plan-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--border-dim);
      transition: var(--transition-smooth);
    }
    .plan-card.featured {
      border-color: var(--primary);
      box-shadow: 0 0 28px rgba(212,255,0,0.2);
    }
    .plan-price {
      font-size: 42px;
      font-weight: 800;
      color: var(--primary);
    }
    /* FAQ */
    .faq-list {
      max-width: 768px;
      margin: 40px auto 0;
    }
    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      border: 1px solid transparent;
      transition: 0.2s;
    }
    .faq-item.active {
      border-color: var(--primary);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 24px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    /* 最终CTA */
    .cta-full {
      background: var(--bg-elevated);
      text-align: center;
      padding: 100px 0;
    }
    /* 页脚 */
    .footer {
      background: #06090F;
      border-top: 1px solid var(--border-dim);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: var(--text-secondary);
      transition: 0.2s;
    }
    .footer a:hover {
      color: var(--primary);
      margin-left: 4px;
    }
    @media (max-width: 1024px) {
      .hero-content {
        flex-direction: column;
      }
      .features-grid, .scenarios-grid, .pricing-grid {
        grid-template-columns: 1fr;
      }
      .feature-alt {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 640px) {
      .container {
        padding: 0 20px;
      }
      .hero-title {
        font-size: 36px;
      }
      .section-title {
        font-size: 28px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }