:root {
            --primary: #004681;
            --secondary: #002dc5;
            --accent: #ff0a0a;
            --bg: #f4f4f4;
            --text: #333;
        }
        body { font-family: Arial, Helvetica, sans-serif; line-height: 1.6; color: var(--text); background: var(--bg); margin: 0; padding: 0; }
        #container { max-width: 1000px; margin: 0 auto; background: #fff; padding: 20px; box-shadow: 0 0 10px rgba(0,0,0,0.1); }
        h1 { color: var(--primary); border-bottom: 2px solid var(--primary); padding-bottom: 10px; }
        #contents { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 20px; }
        #main { flex: 3; min-width: 300px; }
        #menu { flex: 1; min-width: 250px; background: #eee; padding: 15px; border-radius: 8px; }
        .dottbox { border: 2px dotted var(--primary); padding: 15px; margin: 10px 0; background: #fafafa; }
        .rank1, .rank2, .rank3 { background: var(--primary); color: #fff; padding: 10px; font-weight: bold; margin-bottom: 10px; }
        img { max-width: 100%; height: auto; border-radius: 4px; box-shadow: 0 2px 5px rgba(0,0,0,0.2); }
        .menubox { margin-bottom: 20px; }
        .menubox ul { list-style: none; padding: 0; }
        .menubox a { text-decoration: none; color: var(--secondary); display: block; padding: 5px 0; border-bottom: 1px solid #ddd; }
        .youtube { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; margin: 20px 0; }
        .youtube iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
        #footer { text-align: center; margin-top: 40px; padding: 20px; border-top: 1px solid #ddd; font-size: 0.9em; }
        .btn-placeholder { display: block; border: 2px solid var(--accent); color: var(--accent); text-align: center; padding: 15px; margin: 10px auto; font-weight: bold; text-decoration: none; width: fit-content; text-transform: uppercase; }
        
        @media (max-width: 768px) { #contents { flex-direction: column; } }