body {
            font-family: 'Arial', 'Helvetica', 'Malgun Gothic', sans-serif;
            line-height: 1.65;
            background-color: #fff;
            color: #222;
            margin: 0;
            padding: 0;
        }
        header {
            text-align: center;
            margin-bottom: 20px;
            padding-top: 40px;
        }
        header h1 {
            color: #000;
            font-size: 2.4rem;
            margin-bottom: 12px;
        }
        header p {
            font-size: 1.15em;
            color: #222;
            margin-bottom: 0;
        }
        main {
            max-width: 750px;
            margin: 0 auto;
            padding: 30px 0 0 0;
        }
        main h1 {
            color: #000;
            font-size: 1.7rem;
            margin-top: 28px;
            margin-bottom: 14px;
        }
        ul {
            list-style-type: disc;
            padding-left: 22px;
            margin-bottom: 22px;
        }
        li {
            margin-bottom: 10px;
            font-size: 1.07rem;
        }
        hr {
            border: none;
            border-top: 1px solid #bbb;
            margin: 32px 0 18px 0;
        }
        
        .button-wrapper {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin-top: 16px;
            margin-bottom: 30px;
        }
        button.nav {
            margin: 0;
            padding: 11px 18px;
            border: none;
            border-radius: 8px;
            background-color: #87ceeb;
            color: #fff;
            font-size: 1rem;
            font-weight: bold;
            box-shadow: 0 2px 6px rgba(135, 206, 235, 0.16);
            cursor: pointer;
            transition: background-color 0.18s;
            display: inline-block;
        }
        button.nav:hover {
            background-color: #5dade2;
        }
        button.nav a {
            color: inherit;
            text-decoration: none;
            font-weight: bold;
        }