/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary-cyan: #00E676;
      --primary-dark: #00C853;
      --deep-black: #0D0D0D;
      --slate-bg: #1A1A2E;
      --bamboo-green: #6B8E23;
      --accent-orange: #FF6D00;
      --text-primary: #F0F0F5;
      --text-secondary: #B0B0C0;
      --text-muted: #7A7A8C;
      --border-glow: rgba(0, 230, 118, 0.25);
      --card-bg: rgba(26, 26, 46, 0.85);
      --card-radius: 12px;
      --btn-radius: 8px;
      --shadow-glow: 0 0 20px rgba(0, 230, 118, 0.3);
      --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      background-color: var(--deep-black);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

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

    /* ----- 导航 ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background-color: rgba(13, 13, 13, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-glow);
      z-index: 1000;
      padding: 0 24px;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-cyan);
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: radial-gradient(circle at 30% 30%, #00E676, #0D0D0D);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: #0D0D0D;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      padding: 8px 0;
      position: relative;
      transition: var(--transition);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--primary-cyan);
      transition: width 0.3s;
    }

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

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

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

    .hamburger span {
      width: 28px;
      height: 2px;
      background: var(--primary-cyan);
      transition: var(--transition);
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--slate-bg);
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        transform: translateY(-150%);
        transition: transform 0.4s ease;
        border-bottom: 1px solid var(--primary-cyan);
      }
      .nav-links.active {
        transform: translateY(0);
      }
      .hamburger {
        display: flex;
      }
    }

    /* ----- 按钮系统 ----- */
    .btn-primary {
      background: linear-gradient(135deg, #00E676, #00C853);
      color: #0D0D0D;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      letter-spacing: 0.5px;
      box-shadow: 0 4px 12px rgba(0, 230, 118, 0.3);
    }
    .btn-primary:hover {
      background: #00E676;
      box-shadow: 0 0 24px rgba(0, 230, 118, 0.6);
      transform: translateY(-2px);
    }

    .btn-outline {
      border: 1px solid var(--primary-cyan);
      color: var(--primary-cyan);
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(0, 230, 118, 0.08);
      box-shadow: 0 0 16px rgba(0, 230, 118, 0.4);
    }

    /* ----- Hero ----- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding-top: 72px;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(0, 230, 118, 0.15), transparent 60%);
      background-color: rgba(13, 13, 13, 0.7);
    }
    .hero-content {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 4rem;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      text-shadow: 0 0 20px rgba(0,230,118,0.5);
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin: 24px 0 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .dashboard-mock {
      background: rgba(26, 26, 46, 0.8);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-glow);
      border-radius: 20px;
      padding: 20px;
      box-shadow: var(--shadow-glow);
    }
    @media (max-width: 1024px) {
      .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 2.8rem;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    @media (max-width: 480px) {
      .hero-text h1 {
        font-size: 2.2rem;
      }
    }

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: white;
    }
    .section-desc {
      color: var(--text-muted);
      max-width: 700px;
      margin-bottom: 48px;
    }

    /* 功能矩阵 交错布局 */
    .features-grid {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .feature-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-row.offset {
      grid-template-columns: 1fr 2fr 1fr;
    }
    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border-glow);
      border-radius: var(--card-radius);
      padding: 24px;
      transition: var(--transition);
    }
    .feature-card:hover {
      border-color: var(--primary-cyan);
      box-shadow: var(--shadow-glow);
      transform: translateY(-6px);
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--primary-cyan);
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .feature-row, .feature-row.offset {
        grid-template-columns: 1fr;
      }
    }

    /* 场景横向滚动 */
    .scene-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .scene-card {
      min-width: 280px;
      background: var(--card-bg);
      border: 1px solid var(--border-glow);
      border-radius: var(--card-radius);
      padding: 24px;
      scroll-snap-align: start;
    }
    .scene-card img {
      border-radius: 8px;
      margin-bottom: 12px;
    }

    /* 案例对比卡 */
    .case-comparison {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-box {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--card-radius);
      border-left: 4px solid var(--primary-cyan);
    }
    @media (max-width: 768px) {
      .case-comparison {
        grid-template-columns: 1fr;
      }
    }

    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .price-card {
      background: var(--card-bg);
      border: 1px solid var(--border-glow);
      border-radius: var(--card-radius);
      padding: 32px;
      text-align: center;
    }
    .price-card h3 {
      font-size: 2rem;
      color: var(--primary-cyan);
    }
    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-glow);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 页脚 */
    .site-footer {
      background: var(--slate-bg);
      padding: 60px 0 30px;
      border-top: 1px solid var(--primary-cyan);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }
    .footer-bottom {
      margin-top: 40px;
      text-align: center;
      color: var(--text-muted);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    .sticky-cta {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background: var(--primary-cyan);
      color: #0D0D0D;
      font-weight: bold;
      padding: 14px 28px;
      border-radius: 40px;
      box-shadow: 0 0 24px rgba(0,230,118,0.7);
      z-index: 900;
    }