/* roulang page: index */
:root {
      --primary: #0A1628;
      --accent-green: #00E676;
      --accent-orange: #FF6D00;
      --bg-light: #F4F6F9;
      --bg-dark: #0D1B2A;
      --white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-muted: #5A5A5A;
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 10px 25px rgba(0,0,0,0.05);
      --shadow-hover: 0 18px 35px rgba(0,0,0,0.1);
      --radius-lg: 24px;
      --radius-md: 20px;
      --radius-sm: 12px;
      --radius-btn: 40px;
      --container-max: 1280px;
      --nav-height: 76px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Segoe UI', system-ui, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 28px;
    }
    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(18px);
      z-index: 999;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.02);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 28px;
    }
    .logo {
      font-size: 1.9rem;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--primary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--accent-green);
      font-weight: 800;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-dark);
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover {
      color: var(--accent-green);
      border-bottom-color: var(--accent-green);
    }
    .btn-nav {
      background: linear-gradient(135deg, var(--accent-green), #00c853);
      border: none;
      color: var(--primary);
      font-weight: 700;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: all 0.3s;
      text-decoration: none;
      display: inline-block;
      letter-spacing: 0.5px;
    }
    .btn-nav:hover {
      transform: scale(1.04);
      box-shadow: 0 10px 20px rgba(0,230,118,0.3);
      color: #0A1628;
    }
    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      font-size: 2rem;
      cursor: pointer;
      color: var(--primary);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      background: white;
      padding: 32px 28px;
      flex-direction: column;
      gap: 24px;
      box-shadow: 0 20px 30px rgba(0,0,0,0.08);
      z-index: 998;
    }
    .mobile-menu.active {
      display: flex;
    }
    /* Hero */
    .hero {
      background: radial-gradient(circle at 20% 30%, #0F2440, var(--primary));
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: var(--nav-height);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 3.8rem;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      margin-bottom: 1.5rem;
    }
    .hero-content .highlight {
      color: var(--accent-green);
    }
    .hero-desc {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2.5rem;
    }
    .btn-group {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--accent-green), #00e06c);
      border: none;
      color: var(--primary);
      font-weight: 700;
      padding: 16px 38px;
      border-radius: var(--radius-btn);
      font-size: 1.1rem;
      cursor: pointer;
      transition: 0.3s;
      text-decoration: none;
    }
    .btn-primary:hover {
      transform: translateY(-3px);
      box-shadow: 0 16px 28px rgba(0,230,118,0.35);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.3s;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      height: 350px;
      box-shadow: 0 25px 50px rgba(0,0,0,0.5);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }
    .floating-badges {
      position: absolute;
      display: flex;
      gap: 20px;
      bottom: 40px;
    }
    .badge-circle {
      width: 80px;
      height: 80px;
      background: var(--accent-orange);
      border-radius: 50%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: white;
      box-shadow: 0 10px 25px rgba(255,109,0,0.5);
    }
    section {
      padding: 90px 0;
    }
    h2 {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 18px;
    }
    .section-desc {
      color: var(--text-muted);
      max-width: 700px;
      margin-bottom: 3rem;
      font-size: 1.125rem;
    }
    .services-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      grid-template-rows: auto;
      gap: 28px;
      margin-top: 20px;
    }
    .service-card.featured {
      grid-column: span 2;
      display: flex;
      background: white;
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-card);
    }
    .service-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .dark-bg {
      background: var(--bg-dark);
      border-radius: 48px 48px 0 0;
      color: white;
    }
    .stats-container {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      margin-top: 48px;
    }
    .stat-circle {
      width: 130px;
      height: 130px;
      background: var(--accent-orange);
      border-radius: 50%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 2.4rem;
      box-shadow: 0 10px 25px rgba(255,109,0,0.4);
    }
    .faq-item {
      background: white;
      border-radius: 18px;
      margin-bottom: 15px;
      overflow: hidden;
    }
    .faq-question {
      padding: 24px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      padding: 0 24px 24px;
      color: var(--text-muted);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    footer {
      background: var(--primary);
      color: #ddd;
      padding: 70px 0 30px;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .service-card.featured { grid-column: span 1; flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      h1 { font-size: 2.6rem; }
    }