/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary-bg: #0F0F0F;
      --deep-black: #000000;
      --accent-green: #00C896;
      --amber-orange: #F5A623;
      --text-warm: #F2F2F2;
      --text-muted: #B0B0B0;
      --card-bg: #1A1A1A;
      --card-border: rgba(255, 255, 255, 0.06);
      --card-hover-border: rgba(0, 200, 150, 0.3);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "Inter", "SF Mono", "Menlo", "Consolas", monospace;
      --container-max: 1280px;
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.6);
      --transition-smooth: all 0.25s ease;
    }
    
    /* ----- 基础重置 ----- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-black);
      color: var(--text-warm);
      line-height: 1.5;
      -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-smooth);
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
    }
    
    /* ----- 容器与布局 ----- */
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    
    /* ----- 导航 ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 80px;
      background: rgba(15, 15, 15, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      display: flex;
      align-items: center;
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--text-warm);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 1px;
      white-space: nowrap;
    }
    
    .logo i {
      color: var(--accent-green);
      font-size: 28px;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    
    .nav-links a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--accent-green);
      transition: width 0.2s ease, left 0.2s ease;
    }
    
    .nav-links a:hover {
      color: var(--accent-green);
    }
    
    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }
    
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
      z-index: 1001;
    }
    
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-warm);
      transition: var(--transition-smooth);
      border-radius: 2px;
    }
    
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(0,0,0,0.95);
      backdrop-filter: blur(10px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 999;
      font-size: 1.8rem;
      font-weight: 600;
    }
    
    .mobile-menu a {
      color: var(--text-warm);
    }
    
    .mobile-menu a:hover {
      color: var(--accent-green);
    }
    
    .mobile-menu.active {
      display: flex;
    }
    
    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
    }
    
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }
    
    /* ----- 按钮样式 ----- */
    .btn-primary {
      background: var(--accent-green);
      color: #0F0F0F;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 12px rgba(0,200,150,0.25);
    }
    
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
    }
    
    .btn-outline {
      border: 1.5px solid var(--text-warm);
      color: var(--text-warm);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      background: transparent;
    }
    
    .btn-outline:hover {
      border-color: var(--accent-green);
      color: var(--accent-green);
    }
    
    .btn-large {
      padding: 16px 48px;
      font-size: 1.1rem;
    }
    
    .btn-amber {
      background: var(--amber-orange);
      color: #0F0F0F;
    }
    
    /* ----- Hero 首屏 ----- */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      margin-top: 0;
      padding-top: 80px;
    }
    
    .hero::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(0,0,0,0.45) 0%, #000000 100%);
      z-index: 1;
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 0 24px;
    }
    
    .hero h1 {
      font-size: 48px;
      line-height: 1.25;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: white;
    }
    
    .hero .subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 600px;
      margin-left: auto;
      margin-right: auto;
    }
    
    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 24px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    
    .hero-badges {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    
    .badge-item {
      background: rgba(26,26,26,0.7);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 12px;
      padding: 16px 24px;
      min-width: 140px;
      color: white;
    }
    
    .badge-item .number {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-green);
      display: block;
    }
    
    .badge-item .label {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 36px;
      }
      .hero-badges {
        gap: 12px;
      }
      .badge-item {
        padding: 12px 16px;
        min-width: 120px;
      }
    }
    
    /* ----- 通用区块 ----- */
    section {
      padding: 120px 0;
    }
    
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }
    
    .section-title {
      font-size: 36px;
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--text-warm);
    }
    
    .section-desc {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }
    
    /* ----- 数据看板 ----- */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    
    .stat-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      transition: var(--transition-smooth);
    }
    
    .stat-card:hover {
      border-color: var(--card-hover-border);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-green);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    .stat-number i {
      font-size: 1.2rem;
      color: var(--accent-green);
    }
    
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    
    @media (max-width: 1024px) {
      .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (max-width: 520px) {
      .dashboard-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* ----- 服务矩阵 2x3 ----- */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition-smooth);
      display: flex;
      flex-direction: column;
    }
    
    .service-card:hover {
      border-color: var(--card-hover-border);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    .service-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 24px;
      border-radius: 12px;
      overflow: hidden;
      background: #2a2a2a;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    .service-icon img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    
    .service-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    
    .service-card p {
      color: var(--text-muted);
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 20px;
      flex: 1;
    }
    
    .service-link {
      color: var(--accent-green);
      font-weight: 600;
      font-size: 0.9rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    
    .service-link i {
      transition: transform 0.2s;
    }
    
    .service-link:hover i {
      transform: translateX(4px);
    }
    
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* ----- 对比表 ----- */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: start;
    }
    
    .compare-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 32px;
    }
    
    .compare-card h3 {
      font-size: 1.8rem;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    .compare-card.gg h3 {
      color: var(--accent-green);
    }
    
    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      align-items: center;
    }
    
    .compare-row span:first-child {
      color: var(--text-muted);
    }
    
    .icon-check {
      color: var(--accent-green);
    }
    
    .icon-cross {
      color: #888;
    }
    
    @media (max-width: 768px) {
      .comparison-wrapper {
        grid-template-columns: 1fr;
      }
    }
    
    /* ----- FAQ 手风琴 ----- */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 800px;
      margin: 0 auto;
    }
    
    .faq-item {
      background: var(--card-bg);
      border-radius: 8px;
      border: 1px solid var(--card-border);
      overflow: hidden;
    }
    
    .faq-question {
      width: 100%;
      padding: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      color: var(--text-warm);
      font-size: 1.1rem;
      font-weight: 500;
      text-align: left;
      border: none;
    }
    
    .faq-icon {
      font-size: 1.2rem;
      color: var(--accent-green);
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: rgba(0,0,0,0.2);
      color: var(--text-muted);
      padding: 0 20px;
      font-size: 0.95rem;
      line-height: 1.6;
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 20px 20px;
    }
    
    /* ----- CTA 转化条 ----- */
    .cta-strip {
      background: linear-gradient(135deg, #0F0F0F 0%, #1a2f2a 100%);
      text-align: center;
      padding: 80px 0;
    }
    
    .cta-strip h2 {
      color: white;
      font-size: 2.2rem;
      margin-bottom: 16px;
    }
    
    .cta-actions {
      display: flex;
      gap: 20px;
      justify-content: center;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    
    /* ----- 页脚 ----- */
    .site-footer {
      background: #0A0A0A;
      padding: 60px 0 30px;
      color: var(--text-muted);
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    
    .footer-brand .logo {
      margin-bottom: 12px;
      font-size: 22px;
    }
    
    .footer-links h4 {
      color: white;
      margin-bottom: 16px;
    }
    
    .footer-links a {
      display: block;
      margin-bottom: 10px;
      color: var(--text-muted);
    }
    
    .footer-links a:hover {
      color: var(--accent-green);
    }
    
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 16px;
      color: #888;
      transition: var(--transition-smooth);
    }
    
    .social-icons i:hover {
      color: var(--accent-green);
    }
    
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.05);
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
    }
    
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    
    @media (max-width: 520px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }