/* roulang page: index */
:root {
      --primary: #1A1A2E;
      --secondary: #E94560;
      --secondary-dark: #C23152;
      --accent-blue: #0F3460;
      --accent-gold: #F5C518;
      --bg-light: #F8F9FA;
      --text-dark: #1E1E2F;
      --text-muted: #5A5A72;
      --text-light: #FFFFFF;
      --border-light: #E9ECEF;
      --shadow-sm: 0 4px 20px rgba(26, 26, 46, 0.08);
      --shadow-hover: 0 12px 32px rgba(233, 69, 96, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "Roboto", sans-serif;
      --transition: all 0.25s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 Header */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: #FFFFFF;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }
    
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: var(--primary);
    }
    
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-blue) 100%);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.4rem;
      font-weight: 700;
      position: relative;
    }
    
    .logo-icon::after {
      content: "龙";
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--accent-gold);
    }
    
    .logo-text {
      font-size: 1.4rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: var(--primary);
    }
    
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
    }
    
    .nav-links a {
      text-decoration: none;
      color: var(--text-dark);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
      transition: var(--transition);
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width 0.3s ease;
    }
    
    .nav-links a:hover {
      color: var(--secondary);
    }
    
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    
    .search-box {
      display: flex;
      align-items: center;
      background: #F1F3F5;
      border-radius: 20px;
      padding: 6px 16px;
      color: #6C757D;
    }
    
    .search-box i {
      font-size: 0.9rem;
      margin-right: 6px;
    }
    
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 0.85rem;
      width: 120px;
      color: var(--text-dark);
    }
    
    .btn-primary {
      background: var(--secondary);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
    }
    
    .btn-primary:hover {
      background: var(--secondary-dark);
      transform: scale(1.03);
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
    }
    
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    
    .btn-gold {
      background: var(--accent-gold);
      color: #1A1A2E;
      border: none;
      font-weight: 700;
    }
    
    .btn-gold:hover {
      filter: brightness(1.1);
      transform: scale(1.03);
    }
    
    .hamburger {
      display: none;
      font-size: 1.6rem;
      cursor: pointer;
      color: var(--primary);
    }
    
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1A2E 0%, #0F3460 100%);
      padding: 120px 0 80px;
      margin-top: 72px;
      position: relative;
      overflow: hidden;
    }
    
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    
    .hero-content {
      flex: 1;
      color: white;
    }
    
    .hero h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1.2rem;
    }
    
    .hero h1 span {
      color: var(--accent-gold);
    }
    
    .hero-sub {
      font-size: 1.1rem;
      opacity: 0.9;
      margin-bottom: 2rem;
      max-width: 500px;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .hero-image {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    
    .hero-image img {
      max-width: 100%;
      height: auto;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      animation: float 6s ease-in-out infinite;
    }
    
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }
    
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }
    
    .section-title h2 {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
      position: relative;
      display: inline-block;
    }
    
    .section-title h2::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 50%;
      transform: translateX(-50%);
      width: 48px;
      height: 4px;
      background: var(--secondary);
      border-radius: 2px;
    }
    
    .section-title p {
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto;
    }
    
    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    
    .adv-card {
      background: #fff;
      padding: 32px 20px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
      border-top: 4px solid transparent;
    }
    
    .adv-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-top-color: var(--secondary);
    }
    
    .adv-icon {
      font-size: 2.2rem;
      color: var(--secondary);
      margin-bottom: 16px;
    }
    
    .adv-card h3 {
      font-size: 1.2rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    
    /* 产品卡片 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .product-card {
      background: #fff;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border-left: 4px solid var(--secondary);
    }
    
    .product-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    
    .product-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    
    .product-card-content {
      padding: 24px;
    }
    
    .product-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    
    /* 场景 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }
    
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    
    .scenario-text {
      flex: 1;
    }
    
    .scenario-text h3 {
      font-size: 1.6rem;
      font-weight: 700;
      margin-bottom: 12px;
    }
    
    .scenario-img {
      flex: 1;
    }
    
    .scenario-img img {
      width: 100%;
      border-radius: 16px;
    }
    
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      display: flex;
      gap: 20px;
      align-items: center;
      box-shadow: var(--shadow-sm);
    }
    
    .case-logo {
      font-size: 2.2rem;
      color: var(--accent-gold);
    }
    
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border-left: 4px solid transparent;
      transition: 0.2s;
    }
    
    .faq-item.active .faq-question {
      border-left-color: var(--secondary);
      background: #F8F9FA;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 24px;
      color: var(--text-muted);
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }
    
    /* CTA */
    .cta-section {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 72px 0;
    }
    
    /* Footer */
    .footer {
      background: #0F0F1A;
      color: #ccc;
      padding: 60px 0 20px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }
    
    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: repeat(2, 1fr); }
      .products-grid { grid-template-columns: 1fr 1fr; }
    }
    
    @media (max-width: 768px) {
      .nav-links, .header-actions .search-box, .header-actions .btn-primary {
        display: none;
      }
      .hamburger { display: block; }
      .mobile-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.1);
      }
      .mobile-menu.active { display: flex; }
      .hero .container { flex-direction: column; }
      .hero h1 { font-size: 2rem; }
      .advantages-grid, .products-grid, .cases-grid { grid-template-columns: 1fr; }
      .scenario-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }