:root {
    --color-brand: #1d4ed8;
    --color-cta: #f97316;
    --text-dark: #1a1a1a;
    --text-muted: #666;
    --border: #ddd;
    --bg-light: #f8f9fa;
    --bg-white: #fff;
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

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

html, body {
    overflow-x: hidden;
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-brand);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.6;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.25rem;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 1.75rem;
    margin-top: 2.5rem;
    margin-bottom: 1.25rem;
    color: var(--color-brand);
}

h3 {
    font-size: 1.35rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

p {
    margin-bottom: 1rem;
    font-weight: 400;
}

ul, ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
    font-weight: 400;
}

.article-hero {
    position: relative;
    background-color: var(--color-brand);
    padding: 6rem 2rem 4rem;
    text-align: center;
    overflow: hidden;
}

.article-hero img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
    z-index: 1;
}

.article-hero__content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
}

.article-hero h1 {
    color: #fff;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.article-hero__subtitle {
    color: #fff;
    font-size: 1.25rem;
    opacity: 0.9;
}

.article-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.article-intro {
    font-size: 1.125rem;
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.article-toc {
    background-color: var(--bg-light);
    padding: 1.5rem 2rem;
    margin-bottom: 3rem;
    border-radius: 4px;
}

.article-toc__title {
    display: block;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-brand);
}

.article-toc ul {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.article-toc li {
    margin-bottom: 0;
}

.article-toc a {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.9375rem;
    transition: background-color 0.2s;
}

.article-toc a:hover {
    background-color: var(--color-brand);
    color: #fff;
    text-decoration: none;
    border-color: var(--color-brand);
}

.article-section {
    margin-bottom: 3rem;
}

.info-table {
    margin: 2rem 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.info-table h3 {
    margin-bottom: 1rem;
}

.info-table table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-white);
}

.info-table th,
.info-table td {
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.9375rem;
}

.info-table th {
    background-color: var(--color-brand);
    color: #fff;
    font-weight: 700;
}

.info-table tr:hover {
    background-color: var(--bg-light);
}

.article-callout {
    background-color: var(--bg-light);
    padding: 1.5rem 2rem;
    margin: 2rem 0;
    border-radius: 4px;
    font-size: 1.0625rem;
}

.article-callout p {
    margin-bottom: 0;
    font-style: italic;
}

.checklist-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.checklist-group {
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: 4px;
}

.checklist-group h3 {
    font-size: 1.125rem;
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--color-brand);
}

.checklist {
    list-style: none;
    padding: 0;
}

.checklist li {
    padding: 0.5rem 0;
    padding-left: 1.75rem;
    position: relative;
    font-size: 0.9375rem;
}

.checklist li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.625rem;
    width: 14px;
    height: 14px;
    border: 2px solid var(--color-brand);
    border-radius: 2px;
}

.faq-section {
    margin-top: 3rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border);
}

.faq-item {
    margin-bottom: 2rem;
}

.faq-item h3 {
    font-size: 1.125rem;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
}

.faq-item p {
    font-size: 1rem;
}

.article-conclusion {
    background-color: var(--color-brand);
    color: #fff;
    padding: 3rem;
    margin-top: 3rem;
    border-radius: 4px;
}

.article-conclusion h2 {
    color: #fff;
    margin-top: 0;
}

.article-conclusion p {
    color: #fff;
    opacity: 0.95;
}

.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    background-color: var(--color-cta);
    color: #fff;
    font-weight: 700;
    border-radius: 4px;
    text-decoration: none;
    transition: background-color 0.2s;
}

.btn:hover {
    background-color: #e05e00;
    text-decoration: none;
}

@media (max-width: 768px) {
    .article-hero {
        padding: 4rem 1.5rem 3rem;
    }
    
    .article-hero h1 {
        font-size: 1.875rem;
    }
    
    .article-hero__subtitle {
        font-size: 1.125rem;
    }
    
    .article-content {
        padding: 2rem 1.5rem;
    }
    
    h1 {
        font-size: 1.875rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    h3 {
        font-size: 1.25rem;
    }
    
    .article-toc ul {
        flex-direction: column;
    }
    
    .article-toc a {
        display: block;
    }
    
    .checklist-container {
        grid-template-columns: 1fr;
    }
    
    .article-conclusion {
        padding: 2rem 1.5rem;
    }
    
    .info-table th,
    .info-table td {
        padding: 0.75rem;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .article-hero {
        padding: 3rem 1rem 2rem;
    }
    
    .article-hero h1 {
        font-size: 1.625rem;
    }
    
    .article-content {
        padding: 1.5rem 1rem;
    }
    
    h1 {
        font-size: 1.625rem;
    }
    
    h2 {
        font-size: 1.375rem;
        margin-top: 2rem;
    }
    
    h3 {
        font-size: 1.125rem;
        margin-top: 1.5rem;
    }
    
    .article-toc {
        padding: 1rem 1.25rem;
    }
    
    .article-callout {
        padding: 1rem 1.25rem;
    }
    
    .checklist-group {
        padding: 1rem 1.25rem;
    }
    
    .article-conclusion {
        padding: 1.5rem 1rem;
    }
    
    .info-table th,
    .info-table td {
        padding: 0.625rem;
        font-size: 0.8125rem;
    }
}

/* ===== TYPOGRAPHY SPACING FIX (APS_ARTICLE_TYPO_REQUIRED_v2) ===== */
/* Defensive guard against universal * { margin: 0 } reset in global.css. */
/* body-scoped via :where() so specificity stays at 0,0,0,1 — beats * but
   loses to any component rule like .tip-box p / .faq-item p. */
body :where(p)              { margin-bottom: 1.1rem; }
body :where(h2)             { margin-top: 2.5rem; margin-bottom: 1rem; }
body :where(h3)             { margin-top: 1.75rem; margin-bottom: 0.75rem; }
body :where(h4)             { margin-top: 1.25rem; margin-bottom: 0.5rem; }
body :where(ul, ol)         { margin-bottom: 1.1rem; padding-left: 1.5rem; }
body :where(li)             { margin-bottom: 0.4rem; }
body :where(blockquote)     { margin: 1.5rem 0; }