/* 글로벌 스타일 */
:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --text-color: #333;
    --background-color: #fff;
    --accent-color: #e74c3c;
    --border-radius: 12px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    line-height: 1.8;
    color: var(--text-color);
    background-color: #f9f9f9;
    margin: 0;
    padding: 0;
}

#article {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px;
    background-color: var(--background-color);
    box-sizing: border-box;
    box-shadow: var(--box-shadow);
}

/* 제목 스타일 */
#article-title {
    font-size: 2.5em;
    color: var(--text-color);
    text-align: center;
    margin-bottom: 50px;
    font-weight: 700;
    letter-spacing: -0.5px;
    padding-bottom: 20px;
    position: relative;
}

#article-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 150px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    transform: translateX(-50%);
}

/* 목차 스타일 */
#table-of-contents {
    background-color: #f8f9fa;
    border-left: 5px solid var(--primary-color);
    padding: 35px;
    margin-bottom: 60px;
    transition: var(--transition);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    box-shadow: var(--box-shadow);
}

#toc-title {
    color: var(--text-color);
    font-size: 1.8em;
    font-weight: 600;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--primary-color);
}

#toc-list a {
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
    display: block;
    padding: 8px 0;
    font-size: 1.15em;
    border-bottom: 1px solid #ecf0f1;
}

#toc-list a:hover {
    color: var(--primary-color);
    padding-left: 10px;
    background-color: #edf2f7;
}

/* 섹션 스타일 */
[id^="section"] {
    margin-bottom: 70px;
    padding: 40px;
    border: 1px solid #e0e0e0;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

[id^="section"]:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

[id^="section"]::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
}

[id$="-title"] {
    color: var(--text-color);
    font-size: 2.4em;
    font-weight: 600;
    margin: 0 0 30px;
    padding: 20px 0;
    border-bottom: 2px solid var(--primary-color);
    position: relative;
    text-align: center;
}

[id$="-title"]::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 50px;
    height: 2px;
    background-color: var(--accent-color);
    transform: translateX(-50%);
}

[id$="-content"] {
    font-size: 1.15em;
    line-height: 1.9;
    color: var(--text-color);
    text-align: justify;
}

/* 리스트 스타일 */
[id$="-list"] {
    padding-left: 20px;
    margin-top: 25px;
}

[id$="-list"] div {
    position: relative;
    padding-left: 28px;
    margin-bottom: 15px;
    transition: var(--transition);
}

[id$="-list"] div::before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-size: 1.5em;
    top: -2px;
}

/* 이미지 스타일 */
#article img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 35px auto;
    border-radius: var(--border-radius);
    transition: var(--transition);
    box-shadow: var(--box-shadow);
}

#article img:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* 이미지 아래 2줄 내용 스타일 */
#article img + p {
    margin-top: 25px;
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-left: 4px solid var(--primary-color);
    font-style: italic;
    color: #7f8c8d;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

/* 정보 강조 박스 */
[id$="-info"] {
    background-color: #e8f6f3;
    border-left: 5px solid var(--secondary-color);
    padding: 25px 30px;
    margin: 35px 0;
    font-size: 1.1em;
    color: #16a085;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    box-shadow: var(--box-shadow);
}

/* 하이라이트 */
[id$="-highlight"] {
    font-weight: 600;
    color: var(--accent-color);
    background-color: #fdf2f0;
    padding: 25px;
    margin: 30px 0;
    text-align: center;
    font-size: 1.25em;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* 결론 스타일 */
#article > div:last-child {
    background-color: #f8f9fa;
    padding: 50px;
    margin-top: 70px;
    position: relative;
    border-radius: var(--border-radius);
    border: 2px solid var(--primary-color);
    box-shadow: 0 10px 30px rgba(52, 152, 219, 0.1);
}

#article > div:last-child::before {
    content: '결론';
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-color);
    color: #fff;
    padding: 12px 35px;
    font-weight: 600;
    font-size: 1.4em;
    border-radius: 30px;
    box-shadow: var(--box-shadow);
}

#article > div:last-child > div:first-child {
    color: var(--text-color);
    font-size: 2.4em;
    font-weight: 700;
    margin-bottom: 30px;
    text-align: center;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 20px;
}

#article > div:last-child > div:nth-child(2) {
    font-size: 1.25em;
    line-height: 1.8;
    color: var(--text-color);
    text-align: justify;
}

#article > div:last-child > div:last-child {
    font-style: italic;
    background-color: #eaf2f8;
    border-left: 5px solid var(--primary-color);
    padding: 30px;
    margin: 35px 0 0;
    font-size: 1.25em;
    color: #2980b9;
    position: relative;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    box-shadow: var(--box-shadow);
}

/* 반응형 디자인 */
@media (max-width: 1024px) {
    #article {
        padding: 30px;
    }

    #article-title {
        font-size: 2.2em;
    }

    [id$="-title"] {
        font-size: 2.2em;
    }
}

@media (max-width: 768px) {
    #article {
        padding: 20px;
        box-shadow: none;
    }

    #article-title {
        font-size: 2.0em;
    }

    [id$="-title"] {
        font-size: 2em;
    }

    [id^="section"] {
        padding: 30px 20px;
        border: none;
        border-bottom: 1px solid #e0e0e0;
        border-radius: 0;
        margin-bottom: 40px;
    }

    [id^="section"]:last-of-type {
        border-bottom: none;
    }

    [id^="section"]::before {
        height: 3px;
    }

    [id$="-content"], [id$="-list"] div, [id$="-info"] {
        font-size: 1.05em;
    }

    #table-of-contents {
        padding: 25px;
        border-radius: var(--border-radius);
        border: 1px solid #e0e0e0;
        border-left: 5px solid var(--primary-color);
    }

    #article > div:last-child {
        padding: 30px;
        border-radius: var(--border-radius);
    }

    #article > div:last-child > div:first-child {
        font-size: 2em;
    }

    #article > div:last-child > div:nth-child(2),
    #article > div:last-child > div:last-child {
        font-size: 1.15em;
    }
}

@media (max-width: 480px) {
    #article-title {
        font-size: 1.5em;
    }

    [id$="-title"] {
        font-size: 1.8em;
    }

    [id^="section"] {
        padding: 20px 15px;
    }

    [id$="-content"], [id$="-list"] div, [id$="-info"] {
        font-size: 1em;
    }
}

/* 부드러운 스크롤 효과 */
html {
    scroll-behavior: smooth;
}



/* 인쇄 스타일 */
@media print {
    #article {
        box-shadow: none;
        max-width: 100%;
    }
    
    #table-of-contents, [id$="-info"], [id$="-highlight"] {
        background-color: #fff !important;
        border: 1px solid #000;
    }
    
    a {
        text-decoration: underline;
        color: #000;
    }
    
    #article img {
        max-width: 80%;
    }
}