body { margin: 0; padding: 0; font-family: sans-serif; background-color: #f4f7f6; color: #333; }
.container { max-width: 800px; margin: 0 auto; padding: 20px; min-height: 80vh; }

/* 네비게이션 바 스타일 */
nav { background-color: #2c3e50; padding: 15px; text-align: center; }
nav a { color: white; text-decoration: none; margin: 0 15px; font-weight: bold; font-size: 18px; }
nav a:hover { color: #3498db; }

/* 푸터 스타일 */
footer { text-align: center; padding: 20px; background-color: #ddd; color: #666; margin-top: 30px; }
.footer-links { margin-bottom: 10px; }
.footer-links a { color: #555; text-decoration: none; margin: 0 10px; font-size: 13px; }
.footer-links a:hover { text-decoration: underline; }

/* 광고 플레이스홀더 슬롯 */
.ad-slot {
    margin: 30px 0;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff8e1;
    border: 2px dashed #f0ad4e;
    border-radius: 8px;
    color: #b8860b;
    font-size: 14px;
    font-weight: bold;
}

/* 각 도구별 박스 스타일 */
.tool-box { background: white; padding: 30px; border-radius: 10px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); }
input, textarea, button { font-size: 16px; padding: 10px; margin: 5px; }
button { background-color: #3498db; color: white; border: none; cursor: pointer; border-radius: 5px; }
button:hover { background-color: #2980b9; }