/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --accent-gold: #D4AF37;
      --accent-cyan: #00F0FF;
      --bg-light: #F5F5F7;
      --card-bg: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-secondary: #555555;
      --border-light: #E5E5E5;
      
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', system-ui, sans-serif;
      
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 8px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.1);
      --transition-base: all 0.3s ease;
      
      --max-width: 1280px;
      --nav-height: 72px;
      --section-gap: 120px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-base);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: var(--font-title);
      font-weight: 600;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition-base);
    }
    
    /* 导航栏 */
    header.navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    
    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary-deep);
      letter-spacing: 0.5px;
    }
    .logo span {
      color: var(--accent-gold);
    }
    
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    
    .nav-link {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-dark);
      position: relative;
      padding: 8px 0;
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.3s ease;
    }
    
    .nav-link:hover {
      color: var(--accent-gold);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
      background: transparent;
      border: none;
    }
    
    /* 移动端菜单 */
    .mobile-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--primary-deep);
      z-index: 999;
      display: none;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 40px;
      opacity: 0;
      transition: opacity 0.3s ease;
    }
    
    .mobile-overlay.active {
      display: flex;
      opacity: 1;
    }
    
    .mobile-link {
      color: white;
      font-size: 1.8rem;
      font-weight: 600;
    }
    .close-btn {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 2rem;
      color: white;
      background: transparent;
      border: none;
    }
    
    /* Hero */
    .hero {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      margin-top: var(--nav-height);
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(10,14,39,0.7);
      backdrop-filter: blur(2px);
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      color: white;
    }
    
    .hero h1 {
      font-family: var(--font-title);
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2.5rem;
    }
    
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    
    .btn-primary {
      background: var(--accent-gold);
      color: #0A0E27;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      box-shadow: 0 4px 12px rgba(212,175,55,0.3);
    }
    .btn-primary:hover {
      background: #C29B2D;
      box-shadow: 0 0 20px rgba(212,175,55,0.6);
      transform: translateY(-1px);
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      border-color: var(--accent-gold);
      color: var(--accent-gold);
      background: rgba(255,255,255,0.05);
    }
    
    /* 通用板块 */
    section {
      padding: var(--section-gap) 0;
    }
    
    .section-title {
      font-family: var(--font-title);
      font-size: 2.25rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 0.5rem;
      color: var(--primary-deep);
    }
    .section-sub {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }
    
    /* 优势数据 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .stat-card {
      background: var(--card-bg);
      padding: 40px 24px;
      border-radius: var(--radius-card);
      text-align: center;
      box-shadow: var(--shadow-sm);
      border-bottom: 4px solid var(--accent-gold);
      transition: var(--transition-base);
    }
    .stat-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-cyan);
    }
    .stat-label {
      font-weight: 600;
      margin-top: 12px;
    }
    
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      font-size: 2.4rem;
      color: var(--accent-gold);
      margin-bottom: 16px;
    }
    
    /* 案例滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      flex: 0 0 360px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
      scroll-snap-align: start;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .case-info {
      padding: 20px;
    }
    
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      position: relative;
      margin-top: 30px;
    }
    .step {
      text-align: center;
      flex:1;
      position: relative;
    }
    
    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border:1px solid var(--border-light);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      padding: 0 24px;
      transition: var(--transition-base);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 24px 0;
      font-weight: 700;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }
    
    /* CTA */
    .cta-section {
      background: var(--primary-deep);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    
    /* 页脚 */
    footer {
      background: var(--primary-deep);
      color: #ccc;
      padding: 60px 0 24px;
    }
    
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .hero h1 { font-size: 2.4rem; }
      .advantages-grid, .services-grid { grid-template-columns: 1fr; }
      .process-steps { flex-direction: column; gap: 24px; }
    }