/* roulang page: index */
:root {
      --primary-deep: #1A1D23;
      --accent-green: #00E676;
      --accent-green-dark: #00C853;
      --accent-red: #FF1744;
      --bg-light: #F5F6F8;
      --card-bg: #FFFFFF;
      --text-primary: #0B0C0E;
      --text-secondary: #5A5D63;
      --text-muted: #8E9198;
      --border-light: #E8EAED;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 28px rgba(0,230,118,0.12);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --max-width: 1280px;
      --header-top-height: 36px;
      --header-nav-height: 64px;
      --mobile-bottom-nav: 64px;
      --font-sans: "Inter", "SF Pro Display", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-top: calc(var(--header-top-height) + var(--header-nav-height));
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease, background 0.2s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all 0.2s ease;
    }

    /* 顶部信息条 */
    .top-bar {
      background: #0B0C0E;
      color: var(--text-muted);
      font-size: 12px;
      height: var(--header-top-height);
      display: flex;
      align-items: center;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1001;
      padding: 0 24px;
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .top-bar .domain {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .top-bar .brand-tag {
      color: #FFFFFF;
      font-weight: 500;
      background: rgba(255,255,255,0.08);
      padding: 2px 10px;
      border-radius: 20px;
      font-size: 11px;
    }
    .top-bar .action {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .top-bar .action a {
      color: var(--accent-green);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .top-bar .phone {
      color: #ccc;
    }

    /* 主导航 */
    .main-header {
      background: #FFFFFF;
      height: var(--header-nav-height);
      border-bottom: 1px solid rgba(0,0,0,0.04);
      position: fixed;
      top: var(--header-top-height);
      left: 0;
      width: 100%;
      z-index: 1000;
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
    }
    .main-header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary-deep);
      letter-spacing: -0.02em;
    }
    .logo .icon-block {
      width: 10px;
      height: 24px;
      background: var(--accent-green);
      border-radius: 3px;
      display: inline-block;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: var(--text-secondary);
      padding: 8px 0;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--accent-green);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-green);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .mobile-menu-btn {
      display: none;
      font-size: 24px;
      color: var(--text-primary);
    }

    /* 底部移动导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: var(--mobile-bottom-nav);
      background: #FFFFFF;
      border-top: 1px solid var(--border-light);
      z-index: 999;
      justify-content: space-around;
      align-items: center;
      box-shadow: 0 -2px 10px rgba(0,0,0,0.02);
    }
    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 11px;
      color: var(--text-muted);
      gap: 2px;
    }
    .mobile-bottom-nav .center-btn {
      background: var(--accent-green);
      color: #000;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-top: -20px;
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(0,230,118,0.3);
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1D23 0%, #2A2D35 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      color: white;
      margin-top: 0;
    }
    .hero::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: linear-gradient(90deg, var(--accent-green) 0%, transparent 80%);
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
      width: 100%;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: clamp(36px, 5vw, 54px);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }
    .hero-text .subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00E676, #00C853);
      color: #0B0C0E;
      font-weight: 600;
      padding: 0 28px;
      height: 48px;
      border-radius: 8px;
      min-width: 160px;
      box-shadow: 0 4px 14px rgba(0,230,118,0.3);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(0,230,118,0.4);
    }
    .btn-outline {
      border: 1px solid var(--accent-green);
      color: var(--accent-green);
      background: transparent;
      font-weight: 600;
      padding: 0 28px;
      height: 48px;
      border-radius: 8px;
      min-width: 140px;
    }
    .btn-outline:hover {
      background: rgba(0,230,118,0.08);
    }
    .hero-visual {
      flex: 1;
      position: relative;
      background: url('/assets/images/backpic/hero-bg.webp') center/cover no-repeat;
      border-radius: 20px;
      min-height: 380px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      display: flex;
      align-items: flex-end;
      padding: 16px;
    }
    .hud-badge {
      background: rgba(0,0,0,0.7);
      backdrop-filter: blur(8px);
      color: #00E676;
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      display: flex;
      gap: 16px;
    }

    /* 区块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: clamp(28px, 4vw, 36px);
      font-weight: 600;
      margin-bottom: 12px;
      letter-spacing: -0.02em;
    }
    .section-desc {
      color: var(--text-secondary);
      max-width: 600px;
      margin-bottom: 48px;
      font-size: 17px;
    }

    /* 价值主张 */
    .value-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .value-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }
    .value-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .badge-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-green);
      background: rgba(0,230,118,0.08);
      display: inline-block;
      padding: 4px 14px;
      border-radius: 40px;
      margin-bottom: 16px;
    }
    .value-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }

    /* 功能分组 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-img {
      flex: 1;
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #eef1f5;
    }
    .feature-img img {
      width: 100%;
      object-fit: cover;
    }
    .feature-content {
      flex: 1;
    }
    .feature-content h3 {
      font-size: 26px;
      margin-bottom: 14px;
    }
    .feature-list {
      list-style: none;
      margin-top: 16px;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 10px;
      color: var(--text-secondary);
    }
    .feature-list li::before {
      content: '';
      width: 8px;
      height: 8px;
      background: var(--accent-green);
      border-radius: 50%;
    }

    /* 场景卡片 */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scene-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .scene-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .scene-tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin-top: 12px;
    }
    .tag {
      background: #f0f2f5;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      color: var(--text-secondary);
    }
    .scene-card h3 {
      font-size: 20px;
      margin: 16px 0 8px;
    }

    /* 案例区 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--card-bg);
      padding: 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
    }
    .case-avatar {
      width: 48px;
      height: 48px;
      background: #ddd;
      border-radius: 50%;
      margin-bottom: 12px;
    }
    .quote {
      font-style: italic;
      color: var(--text-secondary);
      margin-bottom: 12px;
    }
    .stat-badge {
      color: var(--accent-green);
      font-weight: 700;
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pricing-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      border: 1px solid transparent;
      text-align: center;
    }
    .pricing-card.featured {
      border-color: var(--accent-green);
      box-shadow: 0 0 0 1px var(--accent-green), var(--shadow-hover);
      position: relative;
    }
    .popular-badge {
      background: var(--accent-red);
      color: white;
      font-size: 12px;
      padding: 2px 14px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price {
      font-size: 36px;
      font-weight: 700;
      margin: 16px 0;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 16px 20px;
      box-shadow: var(--shadow-card);
      cursor: pointer;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }
    .faq-item.open {
      border-left-color: var(--accent-green);
      background: #FAFBFC;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }

    /* CTA Banner */
    .cta-banner {
      background: var(--primary-deep);
      color: white;
      padding: 60px 0;
      text-align: center;
      border-radius: 24px;
      margin-top: 40px;
    }

    /* Footer */
    .footer {
      background: #0B0C0E;
      color: var(--text-muted);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer a {
      display: block;
      margin-bottom: 10px;
      font-size: 14px;
    }
    .footer a:hover {
      color: var(--accent-green);
    }

    @media (max-width: 1024px) {
      .value-grid, .scene-grid, .case-grid, .pricing-grid {
        grid-template-columns: 1fr 1fr;
      }
      .feature-row {
        flex-direction: column;
        gap: 30px;
      }
    }

    @media (max-width: 768px) {
      body {
        padding-bottom: 70px;
      }
      .nav-links, .top-bar .brand-tag {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      .value-grid, .scene-grid, .case-grid, .pricing-grid, .faq-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero .container {
        flex-direction: column;
      }
      .hero-visual {
        width: 100%;
      }
    }