/* roulang page: index */
/* ----- 设计变量 & 重置 ----- */
    :root {
      --brand-red: #E8380F;
      --brand-dark: #1A1A2E;
      --brand-gold: #FFB800;
      --bg-light: #F8F9FA;
      --bg-white: #FFFFFF;
      --text-primary: #1A1A2E;
      --text-secondary: #4A4A5E;
      --text-muted: #7B7B8C;
      --border-light: #E9ECEF;
      --radius-sm: 12px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --radius-pill: 50px;
      --shadow-card: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 28px rgba(232,56,15,0.12);
      --transition-base: all 0.25s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.5;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, input {
      font-family: inherit;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 板块通用间距 */
    section {
      padding: 80px 0;
    }
    
    @media (max-width: 768px) {
      section {
        padding: 56px 0;
      }
    }
    
    /* ----- 导航 (桌面固定顶部, 移动端底部胶囊) ----- */
    .main-header {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      box-shadow: 0 4px 20px rgba(0,0,0,0.02);
      border-bottom: 1px solid rgba(0,0,0,0.03);
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    
    .logo-icon {
      font-size: 32px;
      color: var(--brand-red);
      line-height: 1;
    }
    
    .logo-text {
      font-weight: 700;
      font-size: 20px;
      letter-spacing: -0.3px;
      color: var(--text-primary);
    }
    .logo-text span {
      color: var(--brand-red);
    }
    
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    
    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: var(--text-secondary);
      transition: var(--transition-base);
      position: relative;
      padding: 4px 0;
    }
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--brand-red);
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--brand-red);
      transition: var(--transition-base);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 16px;
      right: 16px;
      background: rgba(26,26,46,0.95);
      backdrop-filter: blur(12px);
      border-radius: 40px;
      padding: 8px 16px;
      z-index: 110;
      box-shadow: 0 12px 32px rgba(0,0,0,0.3);
      justify-content: space-around;
      align-items: center;
    }
    
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: rgba(255,255,255,0.7);
      font-size: 11px;
      font-weight: 500;
      transition: var(--transition-base);
      padding: 8px 4px;
    }
    .mobile-nav a i {
      font-size: 20px;
      margin-bottom: 2px;
    }
    .mobile-nav a.active, .mobile-nav a:hover {
      color: var(--brand-gold);
    }
    
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-nav { display: flex; }
      .main-header { display: none; }
      body { padding-bottom: 80px; }
    }
    
    /* ----- 按钮系统 ----- */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      border-radius: var(--radius-pill);
      transition: var(--transition-base);
      cursor: pointer;
      border: 2px solid transparent;
      font-size: 16px;
      padding: 14px 32px;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--brand-red);
      color: white;
      box-shadow: 0 8px 20px rgba(232,56,15,0.3);
    }
    .btn-primary:hover {
      background: var(--brand-gold);
      color: var(--brand-dark);
      border-color: var(--brand-gold);
      transform: translateY(-2px);
      box-shadow: 0 16px 28px rgba(255,184,0,0.35);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--brand-red);
      color: var(--brand-red);
    }
    .btn-outline:hover {
      background: rgba(232,56,15,0.08);
    }
    
    /* ----- Hero 区域 ----- */
    .hero-section {
      background: linear-gradient(135deg, #1A1A2E 0%, #2D2D44 50%, #E8380F 150%);
      position: relative;
      overflow: hidden;
      padding: 140px 0 100px;
      color: white;
    }
    .hero-section::before {
      content: "";
      position: absolute;
      top:0;left:0;width:100%;height:100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.08;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
    }
    .hero-text .highlight {
      color: var(--brand-gold);
    }
    .hero-subtitle {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-mockup {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-mockup img {
      max-height: 480px;
      filter: drop-shadow(0 20px 30px rgba(0,0,0,0.4));
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 { font-size: 36px; }
      .hero-actions { justify-content: center; }
    }
    
    /* 卡片通用 */
    .card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      padding: 28px;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    /* 功能卡片非对称布局 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 28px;
    }
    .feature-main-card {
      grid-column: span 2;
      display: flex;
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
      .feature-main-card {
        grid-column: span 1;
        flex-direction: column;
      }
    }
    
    .data-badge {
      display: inline-flex;
      align-items: center;
      background: rgba(255,184,0,0.12);
      color: #B25E00;
      font-weight: 600;
      border-radius: 30px;
      padding: 4px 14px;
      font-size: 13px;
    }
    
    /* 场景交替 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .scene-row.reverse {
      flex-direction: row-reverse;
    }
    .scene-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: #E9ECEF;
    }
    .scene-img img {
      width: 100%;
      height: auto;
    }
    @media (max-width: 768px) {
      .scene-row, .scene-row.reverse {
        flex-direction: column;
      }
    }
    
    /* 案例墙深色 */
    .dark-wall {
      background: var(--brand-dark);
      border-radius: var(--radius-lg);
      padding: 48px;
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
    }
    .stat-item h3 {
      font-size: 36px;
      font-weight: 800;
      color: var(--brand-gold);
    }
    @media (max-width: 768px) {
      .dark-wall {
        grid-template-columns: 1fr 1fr;
      }
    }
    
    /* 定价表 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .pricing-card.recommended {
      border: 2px solid var(--brand-red);
      position: relative;
    }
    .badge-popular {
      background: var(--brand-red);
      color: white;
      border-radius: 20px;
      padding: 4px 14px;
      font-size: 13px;
      position: absolute;
      top: -12px;
      right: 20px;
    }
    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      font-weight: 600;
      padding: 18px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 18px;
    }
    
    footer {
      background: var(--brand-dark);
      color: #ccc;
      padding: 60px 0 20px;
    }