/* roulang page: index */
:root {
      --primary: #0F62FE;
      --primary-hover: #0043CE;
      --up-green: #00D084;
      --down-red: #F53F3F;
      --bg-surface: #F4F6F9;
      --bg-dark: #0B0F19;
      --text-title: #121826;
      --text-body: #4B5563;
      --text-muted: #9CA3AF;
      --radius: 12px;
      --shadow-normal: 0 4px 20px rgba(0, 0, 0, 0.05);
      --shadow-hover: 0 12px 30px rgba(15, 98, 254, 0.12);
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
      background-color: var(--bg-surface);
      color: var(--text-body);
      line-height: 1.65;
    }
    .clip-hero-diagonal {
      clip-path: polygon(0 0, 100% 0, 100% 94%, 0 100%);
    }
    @media (max-width: 768px) {
      .clip-hero-diagonal {
        clip-path: none;
      }
    }
    .card-elevated {
      background: #FFFFFF;
      border-radius: var(--radius);
      box-shadow: var(--shadow-normal);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .card-elevated:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-answer.open {
      max-height: 240px;
    }