/* roulang page: index */
:root {
      --deep-wood: #1A1410;
      --champagne-gold: #C8A96E;
      --amber-orange: #D4793A;
      --warm-white: #F7F4EF;
      --charcoal: #2C2416;
      --muted-text: #5C5548;
      --border-light: #E5DFD5;
      --card-shadow: 0 4px 24px rgba(26,20,16,0.08);
      --card-shadow-hover: 0 8px 40px rgba(26,20,16,0.15);
      --border-radius-card: 8px;
      --border-radius-btn: 4px;
      --transition-base: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Inter', '苹方', '微软雅黑', system-ui, -apple-system, sans-serif;
      background-color: #FFFFFF;
      color: var(--charcoal);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }
    h1, h2, h3, .font-serif {
      font-family: 'Playfair Display', 'Noto Serif SC', '宋体', '华文宋体', serif;
      font-weight: 700;
    }
    h1 { font-size: 3rem; line-height: 1.2; }
    h2 { font-size: 2.25rem; line-height: 1.25; }
    h3 { font-size: 1.375rem; line-height: 1.3; }
    .text-muted-custom { color: var(--muted-text); }
    a { text-decoration: none; color: inherit; transition: var(--transition-base); }
    img { max-width: 100%; height: auto; display: block; }

    /* 按钮系统 */
    .btn-primary-custom {
      background-color: var(--amber-orange);
      color: #FFFFFF;
      border: none;
      padding: 14px 36px;
      border-radius: var(--border-radius-btn);
      font-weight: 500;
      transition: var(--transition-base);
      display: inline-block;
      text-align: center;
    }
    .btn-primary-custom:hover {
      background-color: #B85E2A;
      color: #FFFFFF;
      transform: translateY(-1px);
    }
    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--champagne-gold);
      color: var(--champagne-gold);
      padding: 14px 36px;
      border-radius: var(--border-radius-btn);
      font-weight: 500;
      transition: var(--transition-base);
      display: inline-block;
      text-align: center;
    }
    .btn-outline-custom:hover {
      background-color: var(--champagne-gold);
      color: var(--deep-wood);
      border-color: var(--champagne-gold);
    }

    /* 导航 */
    .navbar-custom {
      background-color: rgba(26,20,16,0.95);
      backdrop-filter: blur(12px);
      height: 72px;
      padding: 0 1.5rem;
      box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }
    .navbar-brand {
      font-family: 'Playfair Display', serif;
      font-weight: 700;
      font-size: 24px;
      color: var(--champagne-gold) !important;
      letter-spacing: 1px;
    }
    .nav-link-custom {
      color: #F7F4EF !important;
      margin: 0 0.5rem;
      font-weight: 500;
      position: relative;
      padding: 0.5rem 0 !important;
    }
    .nav-link-custom::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--champagne-gold);
      transition: width 0.3s ease;
    }
    .nav-link-custom:hover::after,
    .nav-link-custom.active::after {
      width: 100%;
    }
    .navbar-toggler {
      border-color: var(--champagne-gold);
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(200,169,110,1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    @media (max-width: 991px) {
      .navbar-collapse {
        background: rgba(26,20,16,0.98);
        padding: 2rem;
        border-radius: 0 0 16px 16px;
      }
    }

    /* 区块间距 */
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section-padding { padding: 60px 0; }
      h1 { font-size: 2.4rem; }
      h2 { font-size: 1.9rem; }
    }

    /* Hero */
    .hero-bg {
      background-color: var(--deep-wood);
      position: relative;
      overflow: hidden;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 500px;
      position: relative;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(to right, rgba(26,20,16,0.85), rgba(26,20,16,0.2));
    }
    .hero-text {
      position: relative;
      z-index: 2;
    }

    /* 卡片 */
    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius-card);
      padding: 32px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-base);
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--champagne-gold);
    }
    .icon-gold {
      color: var(--champagne-gold);
      font-size: 2.5rem;
      margin-bottom: 1.5rem;
    }

    /* 解决方案交错 */
    .solution-img {
      border-radius: 8px;
      box-shadow: 0 12px 30px rgba(0,0,0,0.1);
      width: 100%;
      height: auto;
    }
    .strike-text {
      text-decoration: line-through;
      color: #9A8E7F;
      margin-right: 0.5rem;
    }

    /* 数据计数器 */
    .stats-section {
      background-color: var(--warm-white);
    }
    .stat-number {
      font-family: 'Playfair Display', serif;
      font-size: 3rem;
      font-weight: 700;
      color: var(--amber-orange);
    }

    /* 证言卡片 */
    .testimonial-card {
      background: #fff;
      border-left: 3px solid var(--champagne-gold);
      padding: 28px;
      border-radius: 0 var(--border-radius-card) var(--border-radius-card) 0;
      box-shadow: var(--card-shadow);
      font-style: italic;
    }

    /* FAQ手风琴 */
    .accordion-button {
      background-color: var(--warm-white);
      color: var(--charcoal);
      font-weight: 600;
      box-shadow: none;
      border: none;
      padding: 1.2rem 1.5rem;
    }
    .accordion-button:not(.collapsed) {
      background-color: #FFFFFF;
      color: var(--deep-wood);
      border-left: 4px solid var(--champagne-gold);
      box-shadow: none;
    }
    .accordion-button::after {
      background-image: none;
      content: "+";
      font-weight: 400;
      color: var(--champagne-gold);
      font-size: 1.4rem;
    }
    .accordion-button:not(.collapsed)::after {
      content: "−";
    }

    /* 表单 */
    .form-control-custom {
      background: transparent;
      border: none;
      border-bottom: 1px solid #5C5548;
      border-radius: 0;
      color: #FFFFFF;
      padding: 0.75rem 0.25rem;
    }
    .form-control-custom:focus {
      border-bottom-color: var(--champagne-gold);
      box-shadow: none;
      background: transparent;
      color: #fff;
    }
    .form-control-custom::placeholder {
      color: #A89F91;
    }

    /* 页脚 */
    .footer-custom {
      background-color: var(--deep-wood);
      color: var(--muted-text);
      font-size: 0.9rem;
    }
    .footer-link:hover {
      color: var(--champagne-gold);
    }
    @media (max-width: 768px) {
      .btn-primary-custom, .btn-outline-custom {
        width: 100%;
        max-width: 320px;
        display: block;
        margin-left: auto;
        margin-right: auto;
      }
    }