/* ============================================
   블로그 글 페이지 공통 스타일시트
   (모든 블로그 포스트에서 공유)
   ============================================ */

/* ========== 기본 리셋 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', sans-serif;
    line-height: 1.8;
    color: #333;
    background-color: #f9f9f9;
}

/* ========== 헤더 & 네비게이션 ========== */
header {
    background-color: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #1a365d;
    text-decoration: none;
}

.logo span {
    color: #d4af37;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: #d4af37;
}

/* ========== 블로그 컨테이너 ========== */
.blog-container {
    max-width: 800px;
    margin: 3rem auto;
    padding: 0 2rem;
}

.back-link {
    color: #1a365d;
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 2rem;
    display: inline-block;
    transition: opacity 0.3s;
}

.back-link:hover {
    opacity: 0.7;
}

/* ========== 블로그 배너 ========== */
.blog-banner {
    width: 100%;
    height: 400px;
    border-radius: 10px;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-align: center;
    background-size: cover;
    background-position: center;
}

.blog-banner h1 {
    font-size: 2.5rem;
    line-height: 1.2;
    max-width: 600px;
    padding: 0 1rem;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

/* ========== 블로그 메타 정보 ========== */
.blog-meta {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    flex-wrap: wrap;
    padding-bottom: 2rem;
    border-bottom: 2px solid #ecf0f1;
    margin-bottom: 2rem;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: #666;
    font-size: 0.95rem;
}

.category-badge {
    background-color: #1a365d;
    color: #d4af37;
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

/* ========== 블로그 본문 ========== */
.blog-content {
    background-color: white;
    padding: 2.5rem;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.blog-content h2 {
    font-size: 1.8rem;
    color: #1a365d;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid #d4af37;
}

.blog-content h2:first-child {
    margin-top: 0;
}

.blog-content h3 {
    font-size: 1.3rem;
    color: #1a365d;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.blog-content p {
    margin-bottom: 1.5rem;
    line-height: 1.8;
    color: #555;
}

.blog-content ul,
.blog-content ol {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

.blog-content li {
    margin-bottom: 0.75rem;
    color: #555;
    line-height: 1.7;
}

.blog-content a {
    color: #1a365d;
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid #d4af37;
    transition: opacity 0.3s;
}

.blog-content a:hover {
    opacity: 0.75;
}

/* ========== 강조 박스 ========== */
.highlight-box {
    background-color: #fff3cd;
    border-left: 4px solid #d4af37;
    padding: 1.5rem;
    border-radius: 5px;
    margin: 2rem 0;
}

.highlight-box h4 {
    color: #1a365d;
    margin-bottom: 0.5rem;
    font-size: 1rem;
    font-weight: 700;
}

.highlight-box p {
    margin-bottom: 0;
    color: #666;
}

/* ========== 팁 박스 ========== */
.tip-box {
    background-color: #e8f4f8;
    border-left: 4px solid #3498db;
    padding: 1.5rem;
    border-radius: 5px;
    margin: 2rem 0;
}

.tip-box h4 {
    color: #1a365d;
    margin-bottom: 0.5rem;
    font-size: 1rem;
    font-weight: 700;
}

.tip-box p {
    margin-bottom: 0;
    color: #555;
}

/* ========== 코드 블록 (계산 예시 등) ========== */
.code-block {
    background-color: #f4f6f8;
    padding: 1.25rem 1.5rem;
    border-radius: 5px;
    overflow-x: auto;
    margin: 1.5rem 0;
    border-left: 4px solid #1a365d;
}

.code-block code {
    font-family: 'Courier New', Consolas, monospace;
    font-size: 0.9rem;
    color: #2c3e50;
    line-height: 1.9;
    white-space: pre-wrap;
}

/* ========== 푸터 ========== */
footer {
    background-color: #1a365d;
    color: #ecf0f1;
    padding: 2.5rem 2rem;
    margin-top: 3rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    line-height: 2;
}

footer p {
    font-size: 0.9rem;
    color: #bdc3c7;
}

/* ========== 반응형 ========== */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 0.75rem;
        padding: 1rem;
    }

    .logo {
        font-size: 1.2rem;
    }

    nav ul {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    nav a {
        font-size: 0.9rem;
    }

    .blog-container {
        margin: 2rem auto;
        padding: 0 1rem;
    }

    .blog-banner {
        height: 250px;
    }

    .blog-banner h1 {
        font-size: 1.6rem;
    }

    .blog-meta {
        gap: 0.75rem;
    }

    .blog-content {
        padding: 1.5rem;
    }

    .blog-content h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .blog-banner {
        height: 200px;
    }

    .blog-banner h1 {
        font-size: 1.3rem;
    }

    .blog-content {
        padding: 1.25rem;
    }
}