/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --secondary-gold: #F4A261;
      --deep-charcoal: #1D1D1D;
      --night-black: #121212;
      --warm-white: #F8F9FA;
      --card-bg: #FFFFFF;
      --border-light: #E9ECEF;
      --text-muted: #6C757D;
      --text-body: #343A40;
      
      --font-title: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-body: "Noto Sans SC", "Inter", sans-serif;
      --font-data: "DIN Alternate", "Roboto", sans-serif;
      
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
      --shadow-lg: 0 16px 32px rgba(0,0,0,0.16);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-container: 16px;
      --transition: all 0.25s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--warm-white);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
      background-image: radial-gradient(circle at 20% 10%, rgba(230,57,70,0.02) 0%, transparent 40%);
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 排版辅助 */
    h1, h2, h3, .h2, .h3 {
      font-family: var(--font-title);
      font-weight: 700;
      line-height: 1.3;
      color: var(--deep-charcoal);
    }
    
    h1 {
      font-size: 48px;
      letter-spacing: -0.5px;
    }
    
    h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }
    
    h3 {
      font-size: 24px;
    }
    
    .section-title {
      position: relative;
      display: inline-block;
      margin-bottom: 12px;
    }
    
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60%;
      height: 4px;
      background: var(--primary);
      border-radius: 2px;
    }
    
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      font-weight: 600;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: none;
      font-size: 16px;
      gap: 8px;
      white-space: nowrap;
    }
    
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 8px 18px rgba(230,57,70,0.3);
    }
    
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(230,57,70,0.4);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    
    .btn-gold {
      background: var(--secondary-gold);
      color: var(--deep-charcoal);
      font-weight: 700;
    }
    
    .btn-gold:hover {
      background: #e08e4b;
      transform: translateY(-2px);
    }
    
    /* 图片样式 */
    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-card);
    }
    
    /* 卡片组件 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 32px 28px;
      transition: var(--transition);
      border: 1px solid var(--border-light);
      height: 100%;
    }
    
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-5px);
      border-color: transparent;
    }
    
    /* 数据数字 */
    .stat-number {
      font-family: var(--font-data);
      font-weight: 700;
      font-size: 44px;
      color: var(--secondary-gold);
      line-height: 1.2;
    }
    
    /* 背景装饰 */
    .bg-dark {
      background-color: var(--night-black);
      color: #F1F3F5;
    }
    
    .bg-dark h2, .bg-dark h3 {
      color: white;
    }
    
    .text-gold {
      color: var(--secondary-gold);
    }
    
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(18, 18, 18, 0.92);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: var(--transition);
      padding: 16px 0;
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 28px;
      color: white;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    .logo i {
      color: var(--secondary-gold);
      font-size: 30px;
    }
    
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    
    .nav-link {
      color: rgba(255,255,255,0.8);
      text-decoration: none;
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 6px 0;
      transition: var(--transition);
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary-gold);
      transition: var(--transition);
    }
    
    .nav-link:hover {
      color: white;
    }
    
    .nav-link:hover::after {
      width: 100%;
    }
    
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }
    
    /* Hero 区域 */
    .hero {
      padding: 160px 0 100px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      position: relative;
      color: white;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    
    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(90deg, rgba(18,18,18,0.85) 0%, rgba(18,18,18,0.4) 70%);
      z-index: 1;
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    
    .hero h1 {
      color: white;
      margin-bottom: 24px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.4);
    }
    
    .hero .subtitle {
      font-size: 20px;
      margin-bottom: 36px;
      color: rgba(255,255,255,0.9);
      max-width: 550px;
    }
    
    /* 板块间距 */
    section {
      padding: 80px 0;
    }
    
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 32px;
    }
    
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 40px;
      align-items: center;
      margin-top: 32px;
    }
    
    .features-icon {
      font-size: 42px;
      color: var(--secondary-gold);
      margin-bottom: 20px;
    }
    
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      font-size: 18px;
      color: var(--deep-charcoal);
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      padding-top: 0;
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    
    .footer {
      background: var(--deep-charcoal);
      color: #ADB5BD;
      padding: 60px 0 30px;
    }
    
    .footer a {
      color: #CED4DA;
      text-decoration: none;
      transition: var(--transition);
    }
    
    .footer a:hover {
      color: var(--secondary-gold);
    }
    
    /* 响应式设计 */
    @media (max-width: 992px) {
      h1 { font-size: 38px; }
      h2 { font-size: 30px; }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
    }
    
    @media (max-width: 768px) {
      .grid-2 { grid-template-columns: 1fr; }
      .grid-3 { grid-template-columns: 1fr; }
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: var(--night-black);
        flex-direction: column;
        padding: 100px 30px;
        gap: 28px;
        transition: 0.3s ease;
      }
      .nav-menu.active {
        right: 0;
      }
      .hamburger {
        display: block;
        z-index: 1001;
      }
      .hero {
        padding: 140px 0 80px;
        min-height: 70vh;
      }
    }
    
    @media (max-width: 520px) {
      h1 { font-size: 32px; }
      .btn { padding: 12px 24px; }
    }