/* roulang page: index */
/* ===== 设计变量与基础重置 ===== */
    :root {
      --primary-deepgreen: #0A3D2E;
      --accent-gold: #F5A623;
      --accent-gold-hover: #E59400;
      --bg-warmgray: #F7F5F0;
      --card-white: #FFFFFF;
      --card-border: #E8E5DF;
      --text-heading: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #7A7A7A;
      --success-green: #2E8B57;
      --alert-red: #C0392B;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --container-max: 1200px;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.08);
      --transition-base: 0.25s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-stack);
      background-color: var(--bg-warmgray);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    h1, h2, h3 {
      color: var(--text-heading);
      font-weight: 600;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-base);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    
    /* ===== 导航 Header ===== */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--card-border);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary-deepgreen);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--accent-gold);
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    
    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: color var(--transition-base), border-color var(--transition-base);
    }
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-deepgreen);
      border-bottom-color: var(--accent-gold);
    }
    
    .btn-nav-login {
      background: var(--accent-gold);
      color: white !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border-bottom: none !important;
      box-shadow: 0 4px 10px rgba(245,166,35,0.3);
    }
    .btn-nav-login:hover {
      background: var(--accent-gold-hover);
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--primary-deepgreen);
      background: none;
      border: none;
    }
    
    /* 移动端抽屉菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 320px;
      height: 100vh;
      background: var(--primary-deepgreen);
      padding: 80px 30px 30px;
      transition: right 0.35s ease;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 28px;
    }
    .mobile-menu.open {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.2rem;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 8px;
    }
    .close-menu {
      position: absolute;
      top: 20px;
      right: 20px;
      background: none;
      border: none;
      font-size: 2rem;
      color: white;
    }
    
    /* ===== 通用板块样式 ===== */
    section {
      padding: 80px 0;
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 20px;
      font-size: 32px;
      line-height: 1.3;
      font-weight: 600;
      color: var(--text-heading);
    }
    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      max-width: 640px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }
    
    /* 卡片网格 */
    .grid-2, .grid-3, .grid-4 {
      display: grid;
      gap: 24px;
    }
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    
    .card {
      background: var(--card-white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: transform var(--transition-base), box-shadow var(--transition-base);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    
    /* 按钮体系 */
    .btn-primary {
      background: var(--accent-gold);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: background var(--transition-base);
    }
    .btn-primary:hover { background: var(--accent-gold-hover); }
    
    .btn-outline {
      border: 2px solid var(--primary-deepgreen);
      color: var(--primary-deepgreen);
      font-weight: 600;
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      display: inline-block;
      background: transparent;
      transition: all var(--transition-base);
    }
    .btn-outline:hover {
      background: var(--primary-deepgreen);
      color: white;
    }
    
    /* Hero 区域 */
    #hero {
      padding: 140px 0 80px;
      background: linear-gradient(135deg, #0A3D2E 0%, #0a2b20 100%);
      position: relative;
      overflow: hidden;
      color: white;
    }
    .hero-bg-img {
      position: absolute;
      right: 0;
      top: 0;
      width: 50%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.3;
      mask-image: linear-gradient(to left, black 40%, transparent);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 44px;
      line-height: 1.2;
      font-weight: 700;
      color: white;
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }
    .hero-text p {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-stats {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border-radius: 16px;
      padding: 28px 24px;
      min-width: 200px;
      text-align: center;
      border: 1px solid rgba(255,255,255,0.15);
    }
    .hero-stats .stat-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--accent-gold);
    }
    
    /* 功能卡片图标 */
    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--accent-gold);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: white;
      font-size: 1.6rem;
    }
    
    /* 场景卡片图片覆盖 */
    .scene-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: var(--radius-card) var(--radius-card) 0 0;
    }
    .scene-card .card-text {
      padding: 20px;
    }
    
    /* 深色数据卡片 */
    .data-card-dark {
      background: var(--primary-deepgreen);
      color: white;
      padding: 28px;
      border-radius: var(--radius-card);
      text-align: center;
    }
    .data-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--accent-gold);
    }
    
    /* 套餐卡片 */
    .pricing-card {
      background: var(--card-white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 36px 24px;
      text-align: center;
      position: relative;
    }
    .pricing-card.recommended {
      border: 2px solid var(--accent-gold);
      box-shadow: 0 10px 25px rgba(245,166,35,0.15);
    }
    .badge-recommend {
      background: var(--accent-gold);
      color: white;
      padding: 6px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      display: inline-block;
      margin-bottom: 16px;
    }
    
    /* FAQ 手风琴 */
    .faq-item {
      background: var(--card-white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: #FAFAF8;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease;
      background: white;
      padding: 0 24px;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }
    
    /* CTA 条 */
    .cta-band {
      background: var(--primary-deepgreen);
      text-align: center;
      padding: 64px 24px;
      color: white;
    }
    
    /* 页脚 */
    footer {
      background: #0A3D2E;
      color: #CCCCCC;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .hero-content { flex-direction: column; }
      .hero-bg-img { width: 100%; opacity: 0.2; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .hero-text h1 { font-size: 32px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      section { padding: 48px 0; }
    }
    @media (max-width: 480px) {
      .hero-buttons .btn { width: 100%; text-align: center; }
      .footer-grid { grid-template-columns: 1fr; }
    }