/* roulang page: index */
:root {
      --primary: #1B2A3B;
      --primary-hover: #0F1A26;
      --accent: #D4A853;
      --accent-light: rgba(212, 168, 83, 0.1);
      --bg: #F7F8FA;
      --card-bg: #FFFFFF;
      --text-main: #1B2A3B;
      --text-body: #4A5568;
      --text-muted: #718096;
      --text-light: #CBD5E0;
      --border-light: #E2E8F0;
      --success: #2D8B5E;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-tag: 4px;
      --shadow-sm: 0 2px 12px rgba(27, 42, 59, 0.06);
      --shadow-md: 0 8px 24px rgba(27, 42, 59, 0.12);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      color: var(--accent);
      text-decoration: none;
      transition: color 0.2s, text-decoration 0.2s;
    }

    a:hover {
      text-decoration: underline;
      color: #b8923a;
    }

    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 卡片化导航面板 */
    .nav-panel {
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 16px;
      box-shadow: 0 4px 20px rgba(27, 42, 59, 0.08);
      padding: 0.75rem 1.5rem;
      margin-top: 1rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.3s;
    }

    .nav-logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      letter-spacing: -0.3px;
    }

    .nav-logo i {
      color: var(--accent);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      gap: 0.5rem;
      align-items: center;
      flex-wrap: wrap;
    }

    .nav-item {
      background: transparent;
      padding: 0.5rem 1rem;
      border-radius: 8px;
      font-weight: 500;
      color: var(--text-body);
      transition: all 0.2s;
      font-size: 0.95rem;
      display: flex;
      align-items: center;
      gap: 0.4rem;
    }

    .nav-item i {
      font-size: 0.9rem;
      color: var(--accent);
    }

    .nav-item:hover {
      background-color: var(--accent-light);
      color: var(--primary);
      text-decoration: none;
    }

    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
      border: none;
      cursor: pointer;
      font-size: 0.95rem;
    }

    .nav-cta:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 0 2px rgba(212, 168, 83, 0.3);
      text-decoration: none;
    }

    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--primary);
      cursor: pointer;
    }

    /* 板块间距 */
    .section {
      padding: 5rem 0;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 0.75rem;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 48px;
      height: 6px;
      background: var(--accent);
      border-radius: 4px;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 1.5rem;
      transition: all 0.25s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: all 0.2s;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 0 3px rgba(212, 168, 83, 0.25);
      text-decoration: none;
    }

    .btn-accent {
      background: var(--accent);
      color: var(--primary);
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      display: inline-block;
      transition: all 0.2s;
      border: none;
      cursor: pointer;
    }

    .btn-accent:hover {
      filter: brightness(1.1);
      box-shadow: 0 4px 14px rgba(212, 168, 83, 0.4);
      text-decoration: none;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: 0.2s;
    }

    .btn-outline:hover {
      background: var(--accent-light);
      text-decoration: none;
    }

    .faq-item {
      background: white;
      border-radius: 8px;
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      margin-bottom: 1rem;
      overflow: hidden;
    }

    .faq-question {
      padding: 1rem 1.5rem;
      font-weight: 600;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: 0.2s;
    }

    .faq-answer {
      padding: 0 1.5rem 1.2rem;
      color: var(--text-body);
      display: none;
    }

    .faq-item.active .faq-question {
      color: var(--accent);
      border-left: 4px solid var(--accent);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    input, textarea {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-input);
      padding: 0.8rem;
      width: 100%;
      transition: 0.2s;
    }

    input:focus, textarea:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(212,168,83,0.2);
    }

    footer {
      background: var(--primary);
      color: white;
      padding: 3rem 0 1.5rem;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        background: white;
        position: absolute;
        top: 80px;
        left: 16px;
        right: 16px;
        border-radius: 16px;
        box-shadow: var(--shadow-md);
        padding: 1rem;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .section {
        padding: 3rem 0;
      }
      .section-title {
        font-size: 1.8rem;
      }
    }