/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --deep-purple: #1E0F3A;
      --electric-cyan: #00F0FF;
      --bright-purple: #B44CFF;
      --bg-light: #F8F9FC;
      --card-white: #FFFFFF;
      --text-gray: #4A4A6A;
      --border-light: #E2E4F0;
      --footer-text: #B0B0C0;
      --footer-dark: #150A2E;
      
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      
      --shadow-card: 0 4px 20px rgba(30,15,58,0.06);
      --shadow-hover: 0 12px 32px rgba(30,15,58,0.12);
      
      --font-mono: 'Roboto Mono', 'Courier New', monospace;
      --transition-base: 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      font-weight: 400;
      line-height: 1.8;
      color: var(--text-gray);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--deep-purple);
    }
    
    a {
      transition: color var(--transition-base), background var(--transition-base);
      text-decoration: none;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, input, textarea {
      font-family: inherit;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    /* 按钮系统 */
    .btn-primary {
      background: var(--electric-cyan);
      color: var(--deep-purple);
      font-weight: 700;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background var(--transition-base), color var(--transition-base), transform var(--transition-base);
      cursor: pointer;
      text-decoration: none;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      background: var(--bright-purple);
      color: white;
      transform: translateY(-2px);
    }
    
    .btn-outline {
      background: transparent;
      color: var(--electric-cyan);
      border: 2px solid var(--electric-cyan);
      font-weight: 700;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      transition: all var(--transition-base);
      cursor: pointer;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.3px;
    }
    .btn-outline:hover {
      background: var(--electric-cyan);
      color: var(--deep-purple);
      transform: translateY(-2px);
    }
    
    @media (max-width: 640px) {
      .btn-primary, .btn-outline {
        width: 100%;
        padding: 14px 20px;
      }
    }
    
    /* 版块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 60px 0;
      }
    }
    
    /* 卡片基础 */
    .card {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      padding: 32px;
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.2s;
      border: 1px solid transparent;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--electric-cyan);
    }
    
    /* ----- 导航 ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: white;
      height: 72px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--deep-purple);
      text-decoration: none;
    }
    .logo i {
      color: var(--electric-cyan);
      margin-right: 8px;
      font-size: 1.8rem;
    }
    .main-nav {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .main-nav a {
      color: var(--text-gray);
      font-size: 15px;
      font-weight: 500;
      position: relative;
      padding: 8px 0;
    }
    .main-nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-cyan);
      transition: width var(--transition-base);
    }
    .main-nav a:hover {
      color: var(--electric-cyan);
    }
    .main-nav a:hover::after {
      width: 100%;
    }
    .nav-cta {
      margin-left: 16px;
    }
    .burger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--deep-purple);
      cursor: pointer;
    }
    
    @media (max-width: 1024px) {
      .main-nav {
        gap: 16px;
      }
      .main-nav a {
        font-size: 14px;
      }
    }
    
    @media (max-width: 640px) {
      .main-nav {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--deep-purple);
        flex-direction: column;
        align-items: flex-start;
        padding: 24px 20px;
        gap: 20px;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 99;
      }
      .main-nav.active {
        transform: translateX(0);
      }
      .main-nav a {
        color: white;
        font-size: 18px;
        border-bottom: 1px solid rgba(255,255,255,0.2);
        width: 100%;
      }
      .main-nav a::after {
        display: none;
      }
      .nav-cta {
        margin-left: 0;
        width: 100%;
      }
      .burger {
        display: block;
      }
      .desktop-cta {
        display: none;
      }
    }
    
    /* ----- Hero ----- */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: linear-gradient(135deg, #1E0F3A 0%, #3A1B6E 100%);
      position: relative;
      display: flex;
      align-items: center;
      color: white;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.12;
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero h1 {
      font-size: 52px;
      font-weight: 800;
      color: white;
      line-height: 1.2;
      margin-bottom: 20px;
      text-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .hero h1 span {
      color: var(--electric-cyan);
    }
    .hero .subtitle {
      font-size: 22px;
      color: rgba(255,255,255,0.9);
      margin-bottom: 16px;
      font-weight: 500;
    }
    .hero p {
      font-size: 16px;
      color: rgba(255,255,255,0.75);
      max-width: 600px;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    
    @media (max-width: 640px) {
      .hero h1 {
        font-size: 36px;
      }
      .hero .subtitle {
        font-size: 18px;
      }
      .hero-actions {
        flex-direction: column;
        width: 100%;
      }
    }
    
    /* 核心数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: linear-gradient(145deg, #f3eeff, white);
      border-radius: var(--radius-lg);
      padding: 28px 16px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .stat-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 700;
      color: var(--electric-cyan);
      transition: color 0.3s, font-size 0.3s;
    }
    .stat-card:hover .stat-number {
      color: var(--bright-purple);
      font-size: 54px;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-gray);
      margin-top: 8px;
      font-weight: 500;
    }
    
    @media (max-width: 640px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-number {
        font-size: 36px;
      }
    }
    
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .service-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }
    .service-body {
      padding: 24px;
    }
    .service-body h3 {
      font-size: 20px;
      margin-bottom: 10px;
    }
    .service-body p {
      font-size: 14px;
      color: var(--text-gray);
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }
    
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* 结果对比 */
    .compare-row {
      display: flex;
      gap: 30px;
      align-items: center;
    }
    .compare-card {
      flex: 1;
      border-radius: 20px;
      padding: 32px;
      color: white;
    }
    .compare-before {
      background: linear-gradient(135deg, #5a1f1f, #8b3a3a);
    }
    .compare-after {
      background: linear-gradient(135deg, #1f5a4a, #00b38a);
    }
    .compare-icon {
      font-size: 2rem;
      margin-right: 8px;
    }
    .compare-list {
      list-style: none;
      margin-top: 20px;
    }
    .compare-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .divider-arrow {
      font-size: 2.5rem;
      color: var(--electric-cyan);
    }
    
    @media (max-width: 640px) {
      .compare-row {
        flex-direction: column;
      }
      .divider-arrow {
        transform: rotate(90deg);
      }
    }
    
    /* FAQ */
    .accordion-item {
      background: #F8F9FC;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .accordion-title {
      background: #F8F9FC;
      padding: 18px 24px;
      font-weight: 700;
      font-size: 18px;
      cursor: pointer;
      border-left: 4px solid transparent;
      transition: all 0.2s;
    }
    .accordion-title.active {
      background: white;
      border-left-color: var(--electric-cyan);
    }
    .accordion-content {
      padding: 0 24px 20px;
      display: none;
      line-height: 1.8;
    }
    
    /* CTA表单 */
    .cta-section {
      background: linear-gradient(135deg, #1E0F3A, #B44CFF);
    }
    .cta-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .cta-text h2 {
      color: white;
    }
    .cta-text p {
      color: var(--electric-cyan);
      font-size: 18px;
    }
    .form-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      width: 100%;
    }
    .form-card input, .form-card textarea {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 12px;
      width: 100%;
      margin-bottom: 16px;
      transition: border 0.2s, box-shadow 0.2s;
    }
    .form-card input:focus, .form-card textarea:focus {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 0 3px rgba(0,240,255,0.2);
      outline: none;
    }
    
    @media (max-width: 640px) {
      .cta-grid {
        flex-direction: column;
      }
    }
    
    /* 页脚 */
    .footer {
      background: var(--deep-purple);
      color: var(--footer-text);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer h4 {
      color: var(--electric-cyan);
      margin-bottom: 16px;
    }
    .footer a {
      color: var(--footer-text);
      display: block;
      margin-bottom: 8px;
    }
    .footer a:hover {
      color: white;
    }
    .copyright {
      background: var(--footer-dark);
      text-align: center;
      padding: 16px;
      font-size: 12px;
      margin-top: 40px;
    }
    
    @media (max-width: 640px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }