/* roulang page: index */
/* 设计变量和基础重置 */
    :root {
      --primary-deep: #1A1F3B;
      --accent-cyan: #00E5FF;
      --accent-orange: #FF5722;
      --success-green: #00C853;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-primary: #1E293B;
      --text-secondary: #475569;
      --text-muted: #94A3B8;
      --border-light: #E2E8F0;
      --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 10px 25px rgba(0,0,0,0.1);
      --radius-lg: 12px;
      --radius-md: 8px;
      --radius-sm: 6px;
      --transition-base: 0.25s ease;
      --font-sans: 'Noto Sans SC', system-ui, sans-serif;
      --font-mono: 'Inter', 'Segoe UI', monospace;
    }
    
    * {
      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: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-base);
    }
    
    button, input {
      font-family: inherit;
      font-size: inherit;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    
    /* 导航栏 - 吸顶透明变毛玻璃 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: background var(--transition-base), box-shadow var(--transition-base);
      height: 72px;
    }
    
    .site-header.scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      border-bottom: 1px solid rgba(226,232,240,0.6);
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #1A1F3B 0%, #4A517A 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--accent-cyan);
      background: none;
      -webkit-text-fill-color: unset;
    }
    
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    
    .nav-link {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-primary);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: border-color var(--transition-base), color var(--transition-base);
    }
    
    .nav-link:hover,
    .nav-link.active {
      color: var(--accent-cyan);
      border-bottom-color: var(--accent-cyan);
    }
    
    .btn-nav {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--primary-deep);
      padding: 10px 22px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: all var(--transition-base);
      cursor: pointer;
    }
    .btn-nav:hover {
      background: var(--accent-cyan);
      color: #0A0F1F;
      border-color: var(--accent-cyan);
      box-shadow: 0 6px 15px rgba(0,229,255,0.25);
      transform: translateY(-2px);
    }
    
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
      cursor: pointer;
    }
    
    /* 移动端抽屉 */
    .mobile-drawer {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(16px);
      padding: 24px;
      transform: translateY(-110%);
      transition: transform 0.4s ease;
      z-index: 999;
      box-shadow: 0 10px 25px rgba(0,0,0,0.1);
      display: flex;
      flex-direction: column;
      gap: 20px;
      text-align: center;
    }
    .mobile-drawer.open {
      transform: translateY(0);
    }
    .mobile-drawer a {
      font-size: 1.2rem;
      font-weight: 500;
      padding: 12px;
      display: block;
    }
    
    @media (max-width: 1023px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
    }
    
    /* Hero区块 */
    .hero {
      padding: 150px 0 110px;
      background: linear-gradient(135deg, #1A1F3B 0%, #252B4A 100%);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.08;
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 50%;
      background: rgba(0,229,255,0.08);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-lg);
      padding: 28px;
      display: flex;
      flex-direction: column;
      gap: 14px;
      border: 1px solid rgba(0,229,255,0.15);
    }
    
    h1 {
      font-size: 3rem;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
      line-height: 1.25;
      letter-spacing: 1px;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: rgba(230,241,255,0.9);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    .btn-primary {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-md);
      border: none;
      cursor: pointer;
      transition: all var(--transition-base);
      text-align: center;
    }
    .btn-primary:hover {
      background: #00C8E0;
      transform: translateY(-3px);
      box-shadow: 0 12px 24px rgba(0,229,255,0.35);
    }
    .btn-outline-light {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: all var(--transition-base);
    }
    .btn-outline-light:hover {
      background: rgba(255,255,255,0.15);
      transform: translateY(-3px);
    }
    .metric-row {
      display: flex;
      justify-content: space-between;
      color: white;
    }
    .metric-item {
      text-align: center;
      flex: 1;
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-cyan);
    }
    .metric-label {
      font-size: 0.85rem;
      color: #CBD5E1;
    }
    
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      h1 { font-size: 2.5rem; }
      .hero-right { width: 100%; }
    }
    
    /* 通用section样式 */
    .section {
      padding: 110px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--primary-deep);
      text-align: center;
      margin-bottom: 20px;
    }
    .section-desc {
      text-align: center;
      color: var(--text-secondary);
      max-width: 700px;
      margin: 0 auto 50px;
      font-size: 1.1rem;
    }
    
    /* 核心优势三列网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .adv-card {
      background: var(--bg-white);
      padding: 34px 24px;
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      text-align: center;
      transition: transform var(--transition-base), box-shadow var(--transition-base);
    }
    .adv-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--card-shadow-hover);
    }
    .adv-number {
      font-family: var(--font-mono);
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--accent-cyan);
    }
    .adv-label {
      font-weight: 600;
      margin: 8px 0;
    }
    
    /* 服务矩阵 两行三列 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: white;
      padding: 30px 22px;
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      text-align: center;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }
    .service-icon {
      width: 56px;
      height: 56px;
      background: rgba(0,229,255,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-size: 1.8rem;
      color: var(--accent-cyan);
    }
    
    /* 对比区 */
    .comparison-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 30px;
      flex-wrap: wrap;
    }
    .comp-card {
      flex: 1 1 280px;
      background: white;
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--card-shadow);
    }
    .comp-left {
      background: #F1F5F9;
      color: #64748B;
    }
    .comp-right {
      border-left: 5px solid var(--accent-cyan);
      background: white;
    }
    .vs-badge {
      width: 64px;
      height: 64px;
      background: var(--accent-orange);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 1.6rem;
      box-shadow: 0 8px 20px rgba(255,87,34,0.4);
    }
    .comp-right .metric {
      color: var(--success-green);
      font-weight: 700;
      font-family: var(--font-mono);
    }
    
    /* FAQ手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      padding: 16px 24px;
      cursor: pointer;
      box-shadow: var(--card-shadow);
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      margin-top: 10px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    
    @media (max-width: 768px) {
      .advantages-grid, .services-grid, .faq-grid {
        grid-template-columns: 1fr;
      }
      .comparison-row {
        flex-direction: column;
      }
      .section { padding: 80px 0; }
      h1 { font-size: 2.2rem; }
    }
    
    /* 转化表单 */
    .cta-section {
      background: linear-gradient(120deg, #F1F5F9 0%, #E8EEF5 100%);
    }
    .form-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
    }
    .form-input {
      flex: 1;
      padding: 14px 18px;
      border: 1px solid #CBD5E1;
      border-radius: var(--radius-md);
      outline: none;
    }
    .btn-cta {
      background: var(--accent-orange);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 700;
      cursor: pointer;
    }
    
    .footer {
      background: #1A1F3B;
      color: #CBD5E1;
      padding: 70px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }