/* roulang page: index */
:root {
      --primary: #00E676;
      --primary-dark: #00C853;
      --secondary: #FF6D00;
      --secondary-light: #FF9100;
      --bg-deep: #0A0F0D;
      --bg-card: #141C18;
      --bg-footer: #080C0A;
      --text-primary: #F0F5F2;
      --text-secondary: #9BAFA5;
      --text-muted: #5A6B60;
      --border-subtle: rgba(0, 230, 118, 0.15);
      --border-active: rgba(0, 230, 118, 0.6);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-pill: 50px;
      --shadow-card: 0 12px 30px rgba(0, 0, 0, 0.5);
      --shadow-glow: 0 0 30px rgba(0, 230, 118, 0.5);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", system-ui, sans-serif;
      --transition: all 0.25s ease;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }

    body {
      font-family: var(--font-sans);
      background: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition);
    }

    .container {
      width: 100%;
      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, 15, 13, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-subtle);
      transition: var(--transition);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      padding: 0 24px;
      max-width: 1280px;
      margin: 0 auto;
    }

    .logo {
      font-size: 1.6rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #00E676 0%, #00C853 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
    }

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

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      position: relative;
      padding: 6px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

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

    .nav-cta {
      background: linear-gradient(135deg, #00E676, #00C853);
      color: #0A0F0D !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-pill);
      font-weight: 700;
      box-shadow: 0 4px 15px rgba(0, 230, 118, 0.3);
      margin-left: 16px;
    }

    .nav-cta:hover {
      box-shadow: 0 8px 25px rgba(0, 230, 118, 0.6);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
    }

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--primary);
      border-radius: 4px;
      transition: var(--transition);
    }

    /* 移动端菜单 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10, 15, 13, 0.96);
        backdrop-filter: blur(25px);
        flex-direction: column;
        align-items: flex-start;
        padding: 32px 24px;
        gap: 28px;
        transform: translateY(-120%);
        opacity: 0;
        transition: transform 0.3s ease, opacity 0.2s ease;
        border-bottom: 1px solid var(--border-subtle);
        pointer-events: none;
      }

      .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }

      .hamburger {
        display: flex;
      }

      .nav-cta {
        margin-left: 0;
        width: 100%;
        text-align: center;
      }
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: radial-gradient(circle at 30% 40%, rgba(0, 230, 118, 0.15) 0%, transparent 60%);
      background-color: var(--bg-deep);
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }

    .hero-content {
      flex: 1 1 50%;
    }

    .hero-badge {
      display: inline-block;
      background: rgba(255, 109, 0, 0.15);
      color: var(--secondary);
      padding: 6px 18px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      margin-bottom: 24px;
    }

    .hero h1 {
      font-weight: 900;
      font-size: clamp(2.5rem, 6vw, 4rem);
      line-height: 1.15;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #FFFFFF 0%, #E0F2E0 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-highlight {
      color: var(--primary);
      -webkit-text-fill-color: transparent;
      background: linear-gradient(135deg, #00E676, #00C853);
      -webkit-background-clip: text;
      background-clip: text;
    }

    .hero p {
      font-size: 1.2rem;
      color: var(--text-secondary);
      max-width: 500px;
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, #00E676, #00C853);
      color: #0A0F0D;
      font-weight: 700;
      padding: 16px 40px;
      border-radius: var(--radius-pill);
      font-size: 1rem;
      box-shadow: 0 6px 20px rgba(0, 230, 118, 0.4);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0, 230, 118, 0.7);
      transform: translateY(-3px);
    }

    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(0, 230, 118, 0.1);
    }

    .hero-image {
      flex: 1 1 45%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 350px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      position: relative;
      border: 1px solid var(--border-subtle);
    }

    .data-float {
      position: absolute;
      bottom: 20px;
      right: 20px;
      background: linear-gradient(135deg, #FF6D00, #FF9100);
      color: #0A0F0D;
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: 0 6px 18px rgba(255, 109, 0, 0.5);
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-image {
        min-height: 260px;
        width: 100%;
      }
      .hero {
        padding: 120px 0 60px;
      }
    }

    /* 板块通用 */
    section {
      padding: clamp(60px, 10vw, 100px) 0;
    }

    .section-title {
      font-weight: 700;
      font-size: clamp(1.8rem, 4vw, 2.5rem);
      text-align: center;
      margin-bottom: 16px;
      color: var(--text-primary);
    }

    .section-sub {
      text-align: center;
      color: var(--text-secondary);
      max-width: 650px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }

    /* 优势卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .advantage-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: var(--transition);
    }

    .advantage-card:hover {
      border-color: var(--primary);
      transform: translateY(-6px);
      box-shadow: 0 15px 30px rgba(0,0,0,0.6);
    }

    .icon-green {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }

    /* 产品卡片横向滑动 */
    .product-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 10px;
      scrollbar-width: thin;
      scrollbar-color: var(--primary) var(--bg-card);
    }

    .product-card {
      flex: 0 0 300px;
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border-subtle);
      transition: var(--transition);
    }

    .product-card:hover {
      border-color: var(--primary);
      transform: translateY(-5px);
    }

    .tag {
      background: rgba(0,230,118,0.15);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    /* 数据区 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 40px;
      text-align: center;
    }

    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      background: linear-gradient(135deg, #FF6D00, #FF9100);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    details {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      padding: 20px 24px;
      margin-bottom: 16px;
      transition: var(--transition);
    }

    details[open] {
      border-color: var(--primary);
    }

    summary {
      font-weight: 700;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
    }

    /* CTA */
    .cta-section {
      background: radial-gradient(circle at 50% 30%, rgba(0,230,118,0.2), transparent);
    }

    .btn-pulse {
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(0,230,118,0.7); }
      70% { box-shadow: 0 0 0 20px rgba(0,230,118,0); }
      100% { box-shadow: 0 0 0 0 rgba(0,230,118,0); }
    }

    footer {
      background: var(--bg-footer);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px,1fr));
      gap: 40px;
      color: var(--text-muted);
    }

    @media (max-width: 520px) {
      .btn-primary, .btn-outline {
        width: 100%;
        justify-content: center;
      }
    }