/* roulang page: index */
:root {
      --color-primary: #4A4036;
      --color-accent: #C4963D;
      --color-bg: #FAF8F5;
      --color-dark: #3B332B;
      --color-text: #2C241E;
      --color-text-soft: #5C534A;
      --color-text-light: #8C8278;
      --color-border: #E8E2D8;
      --color-white: #FFFFFF;
      --color-bg-alt: #F5F2EC;
      --shadow-card: 0 2px 16px rgba(44,36,30,0.06);
      --shadow-hover: 0 8px 32px rgba(44,36,30,0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", sans-serif;
      --font-number: "DIN Alternate", "Helvetica Neue", "Inter", sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--color-bg);
      color: var(--color-text-soft);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      color: var(--color-text);
      font-weight: 600;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 3rem;
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 2.25rem;
    }
    h3 {
      font-size: 1.5rem;
    }
    h4 {
      font-size: 1rem;
      font-weight: 600;
    }

    .number-font {
      font-family: var(--font-number);
      font-weight: 700;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航样式 */
    .nav-transparent {
      background: rgba(255,255,255,0);
      backdrop-filter: blur(0px);
    }
    .nav-solid {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--color-border);
    }
    .nav-link {
      color: #F5F0E8;
      transition: color 0.2s;
    }
    .nav-solid .nav-link {
      color: var(--color-text-soft);
    }
    .nav-solid .nav-link:hover {
      color: var(--color-accent);
    }
    .nav-link:hover {
      color: var(--color-accent);
    }

    /* 卡片与装饰 */
    .card {
      background: var(--color-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--color-border);
    }
    .accent-dot::before {
      content: '';
      display: block;
      width: 24px;
      height: 2px;
      background: var(--color-accent);
      margin-bottom: 20px;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--color-accent);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0 32px;
      height: 48px;
      font-weight: 600;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background 0.25s ease;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #A87E2E;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--color-accent);
      color: var(--color-accent);
      border-radius: var(--radius-btn);
      padding: 0 32px;
      height: 48px;
      font-weight: 600;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
    }
    .btn-outline:hover {
      background: rgba(196,150,61,0.08);
    }
    .btn-light {
      border: 2px solid white;
      color: white;
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 0 32px;
      height: 48px;
      font-weight: 600;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
    }
    .btn-light:hover {
      background: white;
      color: var(--color-dark);
    }

    /* FAQ 细节 */
    details summary {
      list-style: none;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      color: var(--color-text);
      font-weight: 600;
      font-size: 1rem;
      border-bottom: 1px solid var(--color-border);
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary {
      color: var(--color-accent);
    }
    .faq-icon {
      transition: transform 0.3s ease;
      font-size: 1.5rem;
      color: var(--color-accent);
    }
    details[open] .faq-icon {
      transform: rotate(45deg);
    }

    /* 汉堡菜单 */
    .mobile-menu {
      display: none;
    }
    @media (max-width: 768px) {
      h1 { font-size: 2rem; }
      h2 { font-size: 1.75rem; }
      .mobile-menu.open {
        display: flex;
      }
    }