/* roulang page: index */
:root {
      --primary-deep: #2C3E50;
      --accent-burgundy: #8B2635;
      --bg-warm: #F5F3EF;
      --white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-gray: #5C5C5C;
      --border-soft: #D9D0C7;
      --olive-green: #4A6741;
      --deep-footer: #1A252F;
      --radius-card: 8px;
      --radius-btn: 4px;
      --shadow-card: 0 2px 8px rgba(44, 62, 80, 0.08);
      --shadow-hover: 0 6px 20px rgba(44, 62, 80, 0.15);
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-serif: 'Noto Serif SC', 'STSong', serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      font-size: 16px;
    }
    
    h1, h2, h3 {
      font-family: var(--font-serif);
      font-weight: 600;
      margin-top: 0;
    }
    
    a {
      color: var(--accent-burgundy);
      text-decoration: none;
      transition: all 0.25s ease;
    }
    
    a:hover {
      text-decoration: underline;
      color: #6B1D2A;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .grid-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 16px;
    }
    
    /* 按钮样式 */
    .btn-primary {
      background-color: var(--accent-burgundy);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      display: inline-block;
      text-align: center;
      transition: all 0.25s ease;
      font-size: 16px;
      cursor: pointer;
      box-shadow: 0 2px 5px rgba(0,0,0,0.1);
      text-decoration: none;
    }
    
    .btn-primary:hover {
      background-color: #6B1D2A;
      box-shadow: 0 4px 12px rgba(139, 38, 53, 0.3);
      color: white;
      text-decoration: none;
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: all 0.25s ease;
      text-decoration: none;
    }
    
    .btn-outline:hover {
      background-color: var(--primary-deep);
      color: white;
      text-decoration: none;
    }
    
    .btn-white-outline {
      border: 2px solid white;
      color: white;
      background: transparent;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s ease;
      text-decoration: none;
    }
    
    .btn-white-outline:hover {
      background: white;
      color: var(--primary-deep);
      text-decoration: none;
    }
    
    /* 卡片基底 */
    .card-custom {
      background: var(--white);
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 24px;
      transition: all 0.25s ease;
      height: 100%;
    }
    
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    
    .icon-circle {
      width: 48px;
      height: 48px;
      background-color: #EFEBE6;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-deep);
      font-size: 20px;
      margin-bottom: 16px;
    }
    
    .section-title {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--primary-deep);
      text-align: center;
      position: relative;
    }
    
    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 3px;
      background: var(--accent-burgundy);
      margin: 12px auto 0;
    }
    
    .section-padding {
      padding: 80px 0;
    }
    
    @media (max-width: 640px) {
      .section-padding {
        padding: 48px 0;
      }
      .section-title {
        font-size: 24px;
      }
    }
    
    /* 数字指标样式 */
    .stat-number {
      font-family: 'DM Serif Display', var(--font-serif);
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-burgundy);
      line-height: 1.1;
    }
    
    /* 深色背景区块 */
    .bg-deep {
      background-color: var(--primary-deep);
      color: #F5F3EF;
    }
    
    .bg-deep .section-title {
      color: white;
    }
    
    .bg-deep .section-title::after {
      background: var(--accent-burgundy);
    }
    
    /* 表单样式 */
    input, textarea {
      border: 1px solid var(--border-soft) !important;
      border-radius: 4px !important;
      padding: 12px !important;
      font-size: 16px !important;
      background: white;
      transition: border 0.2s;
    }
    
    input:focus, textarea:focus {
      border-color: var(--accent-burgundy) !important;
      outline: none;
      box-shadow: 0 0 0 2px rgba(139,38,53,0.15);
    }
    
    /* 手风琴定制 */
    .accordion-title {
      font-size: 18px;
      font-weight: 500;
      color: var(--primary-deep);
      border-bottom: 1px solid var(--border-soft);
      padding: 16px 0;
    }
    
    .accordion-title:hover {
      color: var(--accent-burgundy);
    }
    
    .is-active .accordion-title {
      color: var(--accent-burgundy);
      background-color: #F9F7F4;
    }
    
    /* 导航定制 */
    .utility-bar {
      background: var(--primary-deep);
      color: #F5F3EF;
      font-size: 12px;
      padding: 4px 0;
    }
    
    .main-nav {
      background: white;
      box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    }
    
    .main-nav .menu li a {
      color: var(--primary-deep);
      font-weight: 500;
      font-size: 15px;
      padding: 0 16px;
      transition: color 0.2s;
    }
    
    .main-nav .menu li a:hover {
      color: var(--accent-burgundy);
      border-bottom: 2px solid var(--accent-burgundy);
      text-decoration: none;
    }
    
    .logo-text {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary-deep);
    }
    
    .logo-text span {
      color: var(--accent-burgundy);
    }
    
    /* 对比区样式 */
    .compare-left i {
      color: #B33A3A;
    }
    
    .compare-right i {
      color: var(--olive-green);
    }
    
    /* 页脚 */
    .footer {
      background: var(--deep-footer);
      color: #CCCCCC;
      font-size: 14px;
    }
    
    .footer a {
      color: #DDD;
    }
    
    .footer a:hover {
      color: white;
    }
    
    .footer h4 {
      color: white;
      font-size: 16px;
      margin-bottom: 16px;
    }
    
    /* 响应式调整 */
    @media (max-width: 768px) {
      .main-nav .menu {
        flex-direction: column;
        background: white;
      }
    }