/* roulang page: index */
:root {
      --deep-indigo: #1A2B4C;
      --electric-cyan: #00C2BA;
      --light-gray-bg: #F8FAFC;
      --white: #FFFFFF;
      --graphite-black: #1E293B;
      --soft-gray: #E2E8F0;
      --text-primary: #1E293B;
      --text-secondary: #475569;
      --text-on-dark: #F1F5F9;
      --border-light: #E2E8F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.1);
      --transition: all 0.25s ease;
      --font-stack: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-stack);
      background-color: var(--white);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      margin-top: 0;
    }
    
    a {
      color: var(--electric-cyan);
      text-decoration: none;
      transition: var(--transition);
    }
    
    a:hover {
      color: var(--deep-indigo);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, .button {
      cursor: pointer;
      font-family: var(--font-stack);
      transition: var(--transition);
      border: none;
      outline: none;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    /* 导航 Mega Menu */
    .site-header {
      background: var(--deep-indigo);
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
      position: relative;
    }
    
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: white;
      letter-spacing: 1px;
    }
    
    .logo span {
      color: var(--electric-cyan);
    }
    
    .nav-links {
      display: flex;
      list-style: none;
      margin: 0;
      padding: 0;
      gap: 2rem;
    }
    
    .nav-links a {
      color: white;
      font-weight: 500;
      padding: 0.5rem 0;
      position: relative;
      white-space: nowrap;
    }
    
    .nav-links a.active,
    .nav-links a:hover {
      color: var(--electric-cyan);
    }
    
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--electric-cyan);
      border-radius: 2px;
    }
    
    .mega-trigger {
      position: relative;
      cursor: pointer;
    }
    
    .mega-panel {
      position: absolute;
      top: 60px;
      right: 0;
      background: var(--light-gray-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-hover);
      padding: 24px;
      display: none;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      width: 520px;
      z-index: 200;
    }
    
    .mega-trigger:hover .mega-panel,
    .mega-trigger:focus-within .mega-panel {
      display: grid;
    }
    
    .mega-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 16px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    
    .mega-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }
    
    .mega-card h4 {
      font-size: 1rem;
      margin-bottom: 4px;
    }
    
    .cta-entry {
      background: var(--electric-cyan);
      color: white !important;
      padding: 8px 20px !important;
      border-radius: 30px;
      font-weight: 600;
      margin-left: 1rem;
    }
    
    .cta-entry:hover {
      background: #00a8a0;
      color: white !important;
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      cursor: pointer;
    }
    
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--deep-indigo);
        flex-direction: column;
        padding: 20px;
        gap: 1rem;
        z-index: 150;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .mega-panel {
        width: 90vw;
        right: -20px;
        grid-template-columns: 1fr;
      }
    }
    
    /* Hero */
    .hero {
      background: linear-gradient(135deg, var(--deep-indigo) 0%, var(--graphite-black) 100%);
      padding: 100px 0;
      color: white;
      position: relative;
      overflow: hidden;
    }
    
    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.1;
      pointer-events: none;
    }
    
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    
    .hero-left {
      flex: 1;
    }
    
    .hero-left h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    
    .hero-left p {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2rem;
    }
    
    .btn-primary {
      background: var(--electric-cyan);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
      display: inline-block;
      border: none;
      transition: var(--transition);
    }
    
    .btn-primary:hover {
      filter: brightness(1.1);
      color: white;
      transform: translateY(-2px);
    }
    
    .hero-right {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    
    .metric-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-card);
      padding: 24px;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    
    .metric-number {
      font-size: 40px;
      font-weight: 800;
      color: var(--electric-cyan);
    }
    
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 32px;
      }
      .hero-right {
        width: 100%;
      }
    }
    
    /* 通用区块 */
    .section {
      padding: 120px 0;
    }
    
    .section h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
      color: var(--deep-indigo);
    }
    
    .section .subtitle {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }
    
    /* 服务矩阵 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    .icon-placeholder {
      width: 64px;
      height: 64px;
      background: rgba(0,194,186,0.15);
      border-radius: 8px;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      color: var(--electric-cyan);
    }
    
    .service-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    
    @media (max-width: 1024px) {
      .service-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    
    @media (max-width: 640px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
      .section h2 {
        font-size: 26px;
      }
    }
    
    /* 数据对比 */
    .compare-block {
      display: flex;
      gap: 60px;
      align-items: center;
    }
    
    .compare-text {
      flex: 1;
    }
    
    .compare-chart {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    
    .bar-item {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    
    .bar-label {
      width: 100px;
      font-weight: 600;
    }
    
    .bar-wrap {
      flex: 1;
      height: 24px;
      background: #E2E8F0;
      border-radius: 4px;
      overflow: hidden;
      display: flex;
    }
    
    .bar-fill-old {
      background: #94a3b8;
      height: 100%;
    }
    
    .bar-fill-new {
      background: var(--electric-cyan);
      height: 100%;
    }
    
    @media (max-width: 768px) {
      .compare-block {
        flex-direction: column;
      }
    }
    
    /* FAQ 双列手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }
    
    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1rem;
      color: var(--text-primary);
    }
    
    .faq-answer {
      padding: 0 20px 20px;
      display: none;
      color: var(--text-secondary);
    }
    
    .faq-item.active {
      border-color: var(--electric-cyan);
    }
    
    .faq-item.active .faq-answer {
      display: block;
    }
    
    @media (max-width: 640px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* CTA 深色区块 */
    .cta-section {
      background: var(--graphite-black);
      padding: 80px 0;
      color: white;
    }
    
    .cta-flex {
      display: flex;
      gap: 60px;
      align-items: center;
    }
    
    .cta-left h2 {
      color: white;
      text-align: left;
    }
    
    .cta-form input {
      width: 100%;
      padding: 14px;
      margin-bottom: 16px;
      border-radius: var(--radius-btn);
      border: 1px solid transparent;
      background: white;
    }
    
    .cta-form input:focus {
      border-color: var(--electric-cyan);
      outline: none;
    }
    
    @media (max-width: 768px) {
      .cta-flex {
        flex-direction: column;
      }
    }
    
    /* 页脚 */
    .site-footer {
      background: var(--deep-indigo);
      color: white;
      padding: 60px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    
    .footer-col h4 {
      margin-bottom: 16px;
    }
    
    .footer-col a {
      color: #CBD5E1;
      display: block;
      margin-bottom: 8px;
    }
    
    .footer-col a:hover {
      color: var(--electric-cyan);
    }
    
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }