/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #E0312B;
      --primary-dark: #C62828;
      --secondary: #0F1115;
      --bg-warm: #F7F5F2;
      --gold: #D4A843;
      --white: #FFFFFF;
      --card-shadow: 0 8px 30px rgba(15,17,21,0.06);
      --card-shadow-hover: 0 16px 40px rgba(15,17,21,0.12);
      --radius-card: 16px;
      --radius-button: 999px;
      --radius-decor: 24px;
      --border-light: rgba(15,17,21,0.08);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg-warm);
      color: var(--secondary);
      margin: 0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    /* 自定义容器，留白充足 */
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航栏 PC 端白底平台风格 */
    .navbar {
      background-color: var(--white);
      border-bottom: 1px solid rgba(0,0,0,0.02);
      transition: box-shadow 0.2s ease;
    }
    .navbar.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .nav-link {
      color: var(--secondary);
      font-weight: 500;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 1px;
      color: var(--secondary);
    }
    .logo-icon {
      color: var(--primary);
      font-size: 1.8rem;
      margin-right: 0.5rem;
      display: inline-block;
      transform: translateY(2px);
    }

    /* Hero 区域渐变与光斑 */
    .hero-gradient {
      background: linear-gradient(135deg, #0F1115 0%, #2B1A1A 70%, #C62828 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-gradient::before {
      content: "";
      position: absolute;
      top: -20%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(212,168,67,0.25) 0%, rgba(224,49,43,0.15) 40%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }

    /* 卡片基础样式 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }

    /* 胶囊按钮 */
    .btn-primary {
      background-color: var(--primary);
      color: white;
      border-radius: var(--radius-button);
      padding: 0.8rem 2rem;
      font-weight: 600;
      transition: background-color 0.2s, transform 0.1s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
      border-radius: var(--radius-button);
      padding: 0.8rem 2rem;
      font-weight: 600;
      transition: all 0.2s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-light {
      background: var(--white);
      color: var(--secondary);
      border-radius: var(--radius-button);
      padding: 0.8rem 2.2rem;
      font-weight: 700;
      transition: all 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-light:hover {
      background: #f0f0f0;
    }

    /* 数据徽章 */
    .badge-gold {
      background-color: rgba(212,168,67,0.15);
      color: #a57f2a;
      font-weight: 700;
      font-size: 0.8rem;
      padding: 0.25rem 0.9rem;
      border-radius: 20px;
      display: inline-block;
      letter-spacing: 0.5px;
    }

    /* 证言星级 */
    .star-gold {
      color: var(--gold);
      margin-right: 2px;
    }

    /* FAQ 手风琴动画 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease-out;
    }
    .faq-item.open .faq-content {
      max-height: 200px;
    }
    .faq-icon {
      transition: transform 0.3s;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* 响应式断点 */
    @media (max-width: 768px) {
      .desktop-nav {
        display: none !important;
      }
      .mobile-nav {
        display: flex !important;
      }
      .hero-title {
        font-size: 2rem !important;
        line-height: 1.3 !important;
      }
      .hero-subtitle {
        font-size: 1rem !important;
      }
      .hero-image {
        display: none;
      }
    }
    @media (min-width: 769px) {
      .mobile-nav {
        display: none !important;
      }
      .desktop-nav {
        display: flex !important;
      }
    }

    /* 底部导航胶囊 (移动端) */
    .mobile-nav {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      box-shadow: 0 -4px 15px rgba(0,0,0,0.06);
      justify-content: space-around;
      align-items: center;
      padding: 0.6rem 0.8rem;
      z-index: 50;
      border-top-left-radius: 24px;
      border-top-right-radius: 24px;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: #666;
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
    }
    .mobile-nav-item i {
      font-size: 1.4rem;
      margin-bottom: 2px;
    }
    .mobile-nav-item.active {
      color: var(--primary);
      font-weight: 700;
    }

    section {
      padding-top: 80px;
      padding-bottom: 80px;
    }
    @media (max-width: 768px) {
      section {
        padding-top: 48px;
        padding-bottom: 48px;
      }
    }