/* roulang page: index */
:root {
      --deep-teal: #0B3D3A;
      --warm-gold: #C8A96E;
      --warm-gold-hover: #B8934F;
      --shell-gray: #F7F6F3;
      --sand-bg: #F0EBE1;
      --text-dark: #1E1E1E;
      --text-body: #4A4A4A;
      --text-muted: #8B8B8B;
      --white: #FFFFFF;
      --border-light: #D3D3D3;
      --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      --transition-smooth: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--shell-gray);
      color: var(--text-body);
      margin: 0;
      line-height: 1.75;
      font-size: 16px;
      display: flex;
      min-height: 100vh;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, h5, h6 {
      font-weight: 600;
      color: var(--text-dark);
      letter-spacing: -0.2px;
    }

    h1 {
      font-size: 42px;
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 32px;
      font-weight: 600;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
    }

    p, .lead {
      font-size: 16px;
      font-weight: 400;
      color: var(--text-body);
    }

    .text-muted-custom {
      color: var(--text-muted);
      font-size: 13px;
      font-weight: 500;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button, input, textarea {
      font-family: inherit;
    }

    /* ---------- 左侧竖向导航 (桌面) ---------- */
    .side-nav {
      width: 240px;
      background-color: var(--deep-teal);
      color: white;
      height: 100vh;
      position: fixed;
      left: 0;
      top: 0;
      display: flex;
      flex-direction: column;
      z-index: 1030;
      box-shadow: 2px 0 15px rgba(0,0,0,0.08);
    }

    .brand-area {
      padding: 28px 20px 20px;
      border-bottom: 1px solid var(--warm-gold);
      margin-bottom: 20px;
    }

    .brand-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      letter-spacing: 2px;
    }

    .nav-menu {
      flex: 1;
      display: flex;
      flex-direction: column;
      padding: 0 10px;
    }

    .nav-link-item {
      color: rgba(255,255,255,0.85);
      padding: 12px 20px;
      font-size: 15px;
      font-weight: 500;
      border-left: 3px solid transparent;
      transition: 0.2s ease;
      display: block;
      margin-bottom: 2px;
      border-radius: 0 6px 6px 0;
    }

    .nav-link-item:hover,
    .nav-link-item.active {
      background-color: rgba(255,255,255,0.05);
      color: var(--warm-gold);
      border-left-color: var(--warm-gold);
    }

    /* 移动端顶部导航 */
    .mobile-nav {
      display: none;
      background: var(--deep-teal);
      height: 60px;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1040;
    }

    .mobile-logo {
      font-size: 20px;
      font-weight: 700;
      color: white;
    }

    .navbar-toggler-icon {
      background-image: none;
      color: white;
      font-size: 24px;
      display: flex;
      align-items: center;
    }

    .offcanvas {
      background-color: var(--deep-teal);
      color: white;
    }

    .offcanvas .nav-link-item {
      color: white;
    }

    /* 内容区 */
    .main-content {
      margin-left: 240px;
      width: calc(100% - 240px);
      background-color: var(--shell-gray);
    }

    .section-padding {
      padding: 100px 0;
    }

    .container-custom {
      max-width: 1140px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 按钮 */
    .btn-primary-custom {
      background: var(--warm-gold);
      color: var(--deep-teal);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      border: none;
      transition: 0.2s ease;
      display: inline-block;
      text-align: center;
    }

    .btn-primary-custom:hover {
      background: var(--warm-gold-hover);
      transform: scale(1.03);
      color: var(--deep-teal);
    }

    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--deep-teal);
      color: var(--deep-teal);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: 0.2s;
    }

    .btn-outline-custom:hover {
      background: var(--deep-teal);
      color: white;
    }

    .btn-light-outline {
      border: 1.5px solid white;
      color: white;
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
    }

    .btn-light-outline:hover {
      background: white;
      color: var(--deep-teal);
    }

    /* 卡片 */
    .card-custom {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 24px;
      transition: var(--transition-smooth);
      border: none;
      height: 100%;
    }

    .card-custom:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .dark-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(4px);
      color: white;
      border-radius: var(--radius-card);
      padding: 24px;
    }

    /* 板块背景 */
    .bg-deep-teal {
      background-color: var(--deep-teal);
      color: white;
    }

    .bg-sand {
      background-color: var(--sand-bg);
    }

    .bg-shell {
      background-color: var(--shell-gray);
    }

    .text-gold {
      color: var(--warm-gold);
    }

    /* 装饰 */
    .gold-line {
      width: 60px;
      height: 4px;
      background: var(--warm-gold);
      margin: 16px 0;
    }

    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      border-left: 4px solid var(--warm-gold);
      box-shadow: var(--shadow-sm);
    }

    .accordion-button:not(.collapsed) {
      background-color: white;
      color: var(--deep-teal);
      box-shadow: none;
      font-weight: 600;
    }

    .accordion-button:focus {
      border-color: var(--warm-gold);
      box-shadow: 0 0 0 2px rgba(200,169,110,0.25);
    }

    .accordion-item {
      border: none;
      margin-bottom: 12px;
      border-radius: var(--radius-card);
      overflow: hidden;
    }

    .footer-link {
      color: rgba(255,255,255,0.8);
    }

    .footer-link:hover {
      color: var(--warm-gold);
    }

    @media (max-width: 991.98px) {
      .side-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
        padding-top: 60px;
      }
      h1 {
        font-size: 30px;
      }
      h2 {
        font-size: 24px;
      }
      .section-padding {
        padding: 60px 0;
      }
      .card-custom:hover {
        transform: none;
      }
    }