.article-page { color: #334155; }
.article-page h1, .article-page h2, .article-page h3 { color: #172f35; font-weight: 700; line-height: 1.45; text-transform: none; }
.article-page a { color: #21675f; text-decoration: underline; text-underline-offset: 4px; }
.article-page a:hover, .article-page a:focus-visible, .article-footer-link:hover, .article-footer-link:focus-visible { background: #e8f4ed; color: #114b42; outline: 2px solid #71a99a; outline-offset: 3px; }
.article-hero { background: #f1f7f3; border-bottom: 1px solid #dfeae2; padding: 44px 0 54px; }
.article-breadcrumb { display: flex; flex-wrap: wrap; font-size: 13px; gap: 8px; margin-bottom: 35px; }
.article-eyebrow { color: #397467; font-size: 12px; font-weight: 700; letter-spacing: 2px; margin-bottom: 14px; }
.article-hero h1 { font-size: clamp(28px, 3vw, 42px); margin: 0 0 22px; max-width: 970px; }
.article-lead { font-size: 17px; line-height: 1.9; margin: 0; max-width: 840px; }
.article-layout { align-items: start; display: grid; gap: 56px; grid-template-columns: 230px minmax(0, 1fr); padding-bottom: 72px; padding-top: 50px; }
.article-layout::before, .article-layout::after { display: none; }
.article-layout-index { display: block; max-width: 1000px; }
.article-toc { border-left: 2px solid #d5e7dc; padding-left: 18px; position: sticky; top: 150px; }
.article-toc h2 { font-size: 15px; margin: 0 0 16px; }
.article-toc ol { display: grid; gap: 13px; list-style: none; margin: 0; padding: 0; }
.article-toc a { display: inline-block; font-size: 13px; line-height: 1.6; text-decoration: none; }
.article-toc .article-toc-app { border-top: 1px solid #dfeae2; margin-top: 22px; padding-top: 16px; }
.article-section { margin-bottom: 46px; scroll-margin-top: 150px; }
.article-content h2 { font-size: 26px; margin: 0 0 22px; }
.article-content h3 { font-size: 19px; margin: 0 0 10px; }
.article-content p { font-size: 16px; line-height: 1.95; margin: 0 0 20px; }
.article-point-list { display: grid; gap: 20px; margin-top: 26px; }
.article-point-list > div { border-left: 3px solid #a3cbb6; padding-left: 20px; }
.article-point-list p { margin-bottom: 0; }
.article-diagram { background: #f8faf9; border: 1px solid #dfeae2; border-radius: 12px; margin: 26px 0; overflow: hidden; }
.article-diagram .app-sample-preview img { max-height: 350px; }
.article-diagram figcaption { align-items: center; display: flex; flex-wrap: wrap; font-size: 13px; gap: 12px; justify-content: space-between; padding: 14px 18px; }
.article-diagram figcaption > span { color: #64748b; }
.article-card-grid, .article-symbol-grid, .article-example-grid { display: grid; gap: 20px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.article-topic-card { background: #fff; border: 1px solid #dce7df; border-radius: 12px; display: block; padding: 24px; position: relative; text-decoration: none !important; transition: box-shadow 0.2s ease; }
.article-page .article-topic-card:hover, .article-page .article-topic-card:focus-visible { background: #f5faf6; box-shadow: 0 8px 22px rgba(31, 74, 55, 0.08); }
.article-card-number { color: #7b9e8e; display: block; font-size: 13px; letter-spacing: 2px; margin-bottom: 12px; }
.article-topic-card p { color: #64748b; font-size: 14px; line-height: 1.8; margin-bottom: 20px; }
.article-card-arrow { bottom: 14px; position: absolute; right: 20px; }
.article-symbol-card { background: #f7faf8; border: 1px solid #dfeae2; border-radius: 12px; padding: 22px; }
.article-symbol-card svg { display: block; margin: 0 auto 20px; }
.article-symbol-card svg rect, .article-symbol-card svg path, .article-symbol-card svg circle { fill: #eef6ed; stroke: #4b7466; stroke-width: 2; }
.article-symbol-card p { font-size: 14px; margin-bottom: 14px; }
.article-symbol-card .article-symbol-example { color: #547366; font-size: 13px; margin-bottom: 0; }
.article-comparison { background: #f2f7f3; border-radius: 12px; padding: 24px; }
.article-comparison p:last-child { margin-bottom: 0; }
.article-example { border-bottom: 1px solid #dfeae2; padding-bottom: 8px; }
.article-example > p { font-size: 14px; }
.article-example .article-diagram { margin: 18px 0; }
.article-example figcaption > span { display: none; }
.article-reference { color: #64748b; font-size: 13px !important; }
.article-cta { background: #edf5ee; border: 1px solid #d3e4d7; border-radius: 14px; margin: 42px 0; padding: 30px; }
.article-cta p { font-size: 15px; }
.article-related > p { margin-top: 24px; }
.article-guide-feature { align-items: center; border: 1px solid #dce7df; border-radius: 14px; display: grid; gap: 24px; grid-template-columns: 1fr 1fr; overflow: hidden; padding: 28px; text-decoration: none !important; }
.article-guide-feature img { height: auto; width: 100%; }
.article-guide-feature p { color: #64748b; font-size: 15px; }
.article-related-title { margin-top: 44px !important; }
@media (max-width: 991px) {
    .article-layout { gap: 32px; grid-template-columns: minmax(0, 1fr); }
    .article-toc { position: static; }
}
@media (max-width: 600px) {
    .article-hero { padding: 28px 0 36px; }
    .article-layout { padding-top: 32px; }
    .article-content h2 { font-size: 23px; }
    .article-content p { font-size: 15px; }
    .article-card-grid, .article-symbol-grid, .article-example-grid, .article-guide-feature { grid-template-columns: 1fr; }
    .article-cta, .article-guide-feature { padding: 22px; }
    .article-breadcrumb { font-size: 12px; margin-bottom: 24px; }
}
@media (prefers-reduced-motion: reduce) {
    .article-topic-card { transition: none; }
}
.article-app-carousel { margin-top: 26px; }
.article-app-carousel .app-carousel-track { align-items: stretch; }
.article-app-slide { display: flex; padding: 4px 8px; }
.article-page .article-app-card { background: #fff; border: 1px solid #d3e4d7; border-radius: 10px; display: flex; flex-direction: column; overflow: hidden; text-decoration: none; width: 100%; }
.article-page .article-app-card:hover, .article-page .article-app-card:focus-visible { background: #f9fcf9; border-color: #71a99a; outline-offset: -2px; }
.article-app-screenshot { aspect-ratio: 8 / 5; border-bottom: 1px solid #e3ece5; display: block; height: auto; object-fit: contain; width: 100%; }
.article-app-card-content { display: flex; flex: 1; flex-direction: column; padding: 18px; }
.article-app-icon { border-radius: 10px; height: 48px; margin-bottom: 14px; width: 48px; }
.article-app-card-content h3 { font-size: 18px; }
.article-app-card-content p { color: #64748b; font-size: 14px; line-height: 1.7; }
.article-app-card-content span { font-size: 13px; margin-top: auto; padding-top: 6px; }
.article-app-carousel .app-carousel-arrow:hover:not(:disabled), .article-app-carousel .app-carousel-arrow:focus-visible { background: #dceee1; border-color: #397467; color: #174132; outline: 2px solid #71a99a; }
@media (max-width: 600px) {
    .article-app-carousel { padding: 0 30px; }
    .article-app-carousel .app-carousel-arrow { font-size: 20px; height: 28px; width: 28px; }
    .article-app-slide { padding: 4px; }
    .article-app-card-content { padding: 14px; }
}

.article-topic-section + .article-topic-section { border-top: 1px solid #dfeae2; margin-top: 56px; padding-top: 48px; }

.article-diagram .article-sample-note { border-top: 1px solid #dfeae2; color: #64748b; font-size: 12px; line-height: 1.7; margin: 0; padding: 12px 18px; }