/* roulang page: index */
:root {
      --primary-orange: #FF6A3D;
      --primary-green: #2DD4BF;
      --accent-yellow: #FFC107;
      --dark-charcoal: #1E1E2F;
      --warm-white: #FAF9F6;
      --light-gray-green: #EFFAF5;
      --text-body: #2D2D3A;
      --text-muted: #5A5A6E;
      --border-light: rgba(0,0,0,0.06);
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-btn: 12px;
      --transition: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--warm-white);
      color: var(--text-body);
      line-height: 1.6;
      display: flex;
      flex-direction: row;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }

    /* 左侧竖向导航 (桌面) */
    .side-nav {
      width: 80px;
      background-color: var(--dark-charcoal);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      position: fixed;
      top: 0;
      left: 0;
      height: 100vh;
      z-index: 1000;
      box-shadow: 2px 0 12px rgba(0,0,0,0.06);
      padding: 1.5rem 0.5rem;
      transition: var(--transition);
    }

    .logo-area {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.25rem;
      margin-bottom: 1.5rem;
    }

    .logo-icon {
      font-size: 2rem;
      background: linear-gradient(135deg, var(--primary-orange), var(--primary-green));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .logo-text {
      font-weight: 700;
      font-size: 0.7rem;
      color: white;
      letter-spacing: 1px;
      writing-mode: vertical-rl;
      text-orientation: mixed;
      margin-top: 0.25rem;
    }

    .nav-links {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 1.8rem;
      flex: 1;
      justify-content: center;
    }

    .nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: rgba(255,255,255,0.7);
      text-decoration: none;
      font-size: 0.7rem;
      font-weight: 500;
      transition: var(--transition);
      position: relative;
      padding: 0.25rem 0;
    }

    .nav-item i {
      font-size: 1.25rem;
      margin-bottom: 0.2rem;
    }

    .nav-item:hover, .nav-item.active {
      color: var(--primary-orange);
    }

    .nav-item.active::before {
      content: '';
      position: absolute;
      left: -12px;
      top: 0;
      bottom: 0;
      width: 3px;
      background: linear-gradient(to bottom, var(--primary-orange), var(--primary-green));
      border-radius: 0 4px 4px 0;
    }

    .nav-footer {
      color: rgba(255,255,255,0.5);
      font-size: 0.6rem;
      text-align: center;
      margin-top: auto;
      display: flex;
      flex-direction: column;
      gap: 0.25rem;
    }

    /* 主内容区域 */
    .main-content {
      margin-left: 80px;
      width: calc(100% - 80px);
      background-color: var(--warm-white);
    }

    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
    }

    /* 容器工具 */
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 按钮样式 */
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-orange), var(--primary-green));
      color: white;
      font-weight: 700;
      padding: 0.85rem 2rem;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      box-shadow: 0 6px 14px rgba(255,106,61,0.25);
      letter-spacing: 0.3px;
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 10px 20px rgba(255,106,61,0.35);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-orange);
      color: var(--primary-orange);
      font-weight: 700;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }

    .btn-outline:hover {
      background: rgba(255,106,61,0.08);
      border-color: var(--primary-green);
      color: var(--dark-charcoal);
    }

    /* 卡片效果 */
    .card-hover {
      transition: var(--transition);
      background: white;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
    }

    .card-hover:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }

    /* 背景图区域 */
    .hero-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .hero-overlay {
      background: linear-gradient(135deg, rgba(255,106,61,0.75), rgba(45,212,191,0.7));
      position: absolute;
      inset: 0;
    }

    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
    }

    .faq-question {
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--dark-charcoal);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-muted);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 0.8rem;
    }

    .faq-icon {
      color: var(--primary-orange);
      font-weight: bold;
      font-size: 1.3rem;
    }

    @media (max-width: 1024px) {
      .container-custom {
        padding: 0 1.5rem;
      }
    }

    @media (max-width: 768px) {
      body {
        flex-direction: column;
      }

      .side-nav {
        display: none;
      }

      .main-content {
        margin-left: 0;
        width: 100%;
      }

      .mobile-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 1rem 1.5rem;
        background: white;
        box-shadow: 0 4px 10px rgba(0,0,0,0.03);
        position: sticky;
        top: 0;
        z-index: 999;
      }

      .mobile-logo {
        font-weight: 800;
        font-size: 1.5rem;
        background: linear-gradient(135deg, var(--primary-orange), var(--primary-green));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
      }

      #menuToggle {
        font-size: 1.8rem;
        color: var(--dark-charcoal);
        background: none;
        border: none;
      }

      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--dark-charcoal);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        z-index: 1001;
      }

      .mobile-menu.open {
        transform: translateX(0);
      }

      .mobile-menu a {
        color: white;
        font-size: 1.3rem;
        text-decoration: none;
        font-weight: 600;
      }

      .close-menu {
        position: absolute;
        top: 1.5rem;
        right: 1.5rem;
        font-size: 2rem;
        color: white;
        background: none;
        border: none;
      }

      .hero-title {
        font-size: 2.5rem !important;
      }
    }