:root {
    --primary: #106EE8;
    --primary-light: #E8F2FF;
    --dark-blue: #0F172A;
    --gray-light: #F8FAFC;
    --gray-border: #E2E8F0;
    --text-dark: #1E293B;
    --text-muted: #64748B;
    --orange: #f97316;
    --orange-light: #fff7ed;
    --radius-lg: 16px;
    --radius-md: 10px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.25s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--gray-light);
    color: var(--text-dark);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

/* Navbar */
.navbar {
    background-color: #ffffff;
    border-bottom: 1px solid var(--gray-border);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.navbar-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.back-link {
    display: flex;
    align-items: center;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--primary);
    transform: translateX(-4px);
}

.back-link svg {
    margin-right: 8px;
}

.brand-logo {
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--dark-blue);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-logo img {
    width: 28px;
    height: 28px;
    border-radius: 6px;
}

.brand-logo span {
    color: var(--primary);
}

/* Article Wrapper */
.article-container {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}

.article-card {
    background: #ffffff;
    border: 1px solid var(--gray-border);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
}

/* Post Header */
.post-meta {
    display: flex;
    gap: 12px;
    font-size: 0.9rem;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 15px;
}

.post-title {
    font-size: 2.2rem;
    font-weight: 900;
    line-height: 1.35;
    color: var(--dark-blue);
    margin-bottom: 20px;
    word-break: keep-all;
}

.post-date-author {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 0.9rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--gray-border);
    padding-bottom: 20px;
    margin-bottom: 30px;
}

/* Post Content Typography */
.post-content h3 {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--dark-blue);
    margin-top: 35px;
    margin-bottom: 15px;
    position: relative;
    padding-left: 12px;
}

.post-content h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 6px;
    bottom: 6px;
    width: 4px;
    background-color: var(--primary);
    border-radius: 2px;
}

.post-content h4 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-top: 25px;
    margin-bottom: 10px;
}

.post-content p {
    margin-bottom: 20px;
    font-size: 1.05rem;
    color: #334155;
    word-break: keep-all;
}

.post-content strong {
    color: var(--dark-blue);
    font-weight: 700;
}

/* Specialized Boxes */
.quote-box {
    background-color: var(--primary-light);
    border-left: 4px solid var(--primary);
    padding: 20px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
    margin: 25px 0;
    word-break: keep-all;
}

.code-box { 
    background: #1e293b; 
    color: #e2e8f0; 
    padding: 20px; 
    border-radius: 8px; 
    margin: 20px 0; 
    font-family: monospace; 
    font-size: 0.95rem; 
    line-height: 1.6; 
    overflow-x: auto; 
}

.comment-box { 
    background-color: #f8fafc; 
    border: 1px solid #cbd5e1; 
    border-radius: var(--radius-md); 
    padding: 20px; 
    font-size: 1rem; 
    color: #334155; 
    margin: 25px 0; 
    position: relative; 
}

.comment-box::before { 
    content: '💡 HeatSafe 코멘트'; 
    display: block; 
    font-weight: 800; 
    color: var(--primary); 
    margin-bottom: 8px; 
    font-size: 1.05rem; 
}

.post-content .formula-box { 
    background:#f1f5f9; 
    border:1px solid #cbd5e1; 
    padding:15px 20px; 
    border-radius:8px; 
    font-family:monospace; 
    font-size:1.1rem; 
    color:#0f172a; 
    margin:20px 0; 
    word-break:break-all; 
    text-align:center; 
}

/* Rule Card Box */
.rules-wrapper {
    margin: 30px 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.rule-item-box {
    background-color: var(--gray-light);
    border: 1px solid var(--gray-border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
}

.rule-item-box:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: #cbd5e1;
}

.rule-title {
    font-size: 1.15rem;
    font-weight: 800;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.rule-badge {
    background-color: var(--orange-light);
    color: var(--orange);
    font-size: 0.8rem;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 700;
}

.rule-app-guide {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--gray-border);
    font-size: 0.95rem;
    color: #475569;
}

/* CTA Section */
.cta-card {
    background: linear-gradient(135deg, var(--dark-blue) 0%, #1e293b 100%);
    border-radius: var(--radius-lg);
    padding: 35px;
    text-align: center;
    color: #ffffff;
    margin-top: 50px;
}

.cta-card h4 {
    font-size: 1.4rem;
    margin-bottom: 10px;
    font-weight: 800;
    color: #ffffff;
}

.cta-card p {
    font-size: 1rem;
    color: #cbd5e1;
    margin-bottom: 25px;
}

.cta-btn {
    display: inline-block;
    background-color: var(--primary);
    color: #ffffff;
    text-decoration: none;
    padding: 14px 30px;
    border-radius: 8px;
    font-weight: 700;
    transition: var(--transition);
}

.cta-btn:hover {
    background-color: #0f62d1;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(16, 110, 232, 0.4);
}

.web-link {
    display: inline-block;
    margin-top: 15px;
    color: #60a5fa;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
}

.web-link:hover {
    text-decoration: underline;
}

/* Tag List */
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 40px;
    padding-top: 25px;
    border-top: 1px solid var(--gray-border);
}

.tag-badge {
    background-color: #f1f5f9;
    color: #64748b;
    font-size: 0.85rem;
    padding: 4px 12px;
    border-radius: 50px;
    font-weight: 500;
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--gray-border);
    margin-top: 60px;
    background-color: #ffffff;
}