:root {
        --bg: #2b2b2b;
        --card-bg: #1e1e1e;
        --border: #333331;
        --text-primary: #f2f2f0;
        --text-secondary: #a3a39e;
        --accent: #3b82f6;
        --accent-hover: #2563eb;
      }
      * {
        box-sizing: border-box;
      }
      body {
        margin: 0;
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        background: var(--bg);
        font-family: -apple-system, "Segoe UI", "Malgun Gothic", sans-serif;
        color: var(--text-primary);
        padding: 24px;
      }
      main.card {
        background: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: 0;
        max-width: 600px;
        width: 100%;
        padding: 48px 40px;
        text-align: center;
        clip-path: polygon(30% 0%, 70% 0%, 100% 30%, 100% 70%, 70% 100%, 30% 100%, 0% 70%, 0% 30%);
      }
      .icon {
        font-size: 32px;
        margin-bottom: 20px;
      }
      h1 {
        font-size: 20px;
        font-weight: 600;
        margin: 0 0 20px;
        line-height: 1.5;
        letter-spacing: -0.5px;
      }
      p.desc {
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.7;
        margin: 0 0 28px;
        letter-spacing: -0.3px;
      }
      section.info {
        text-align: center;
        border-top: 1px solid var(--border);
        padding-top: 24px;
        margin-top: 28px;
      }
      section.info h2 {
        font-size: 14px;
        font-weight: 600;
        margin: 0 0 12px;
      }
      section.info p {
        font-size: 13px;
        color: var(--text-secondary);
        line-height: 1.8;
        margin: 0 0 16px;
        letter-spacing: -0.3px;
      }
      section.info p:last-child {
        margin-bottom: 0;
      }
      .btn {
        display: inline-block;
        width: 100%;
        padding: 14px 0;
        background: var(--accent);
        color: #fff;
        text-decoration: none;
        font-size: 15px;
        font-weight: 600;
        border-radius: 8px;
        border: none;
        cursor: pointer;
        transition: background 0.15s ease;
        margin: 0;
      }
      .btn:hover {
        background: var(--accent-hover);
      }
      .note {
        margin-top: 24px;
        padding-top: 24px;
        border-top: 1px solid var(--border);
        font-size: 12px;
        color: var(--text-secondary);
        line-height: 1.6;
        letter-spacing: -0.3px;
      }