/* 文章頁 / 文章列表（沿用 app.css 嘅色彩同頁首頁尾） */
.bar-nav { display: inline-flex; align-items: center; gap: 14px; }
.article { max-width: 780px; padding-top: 28px; padding-bottom: 56px; }
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.crumbs a { color: var(--sky); text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }
.article h1 { font-family: var(--font-serif); font-size: clamp(26px, 5vw, 36px); line-height: 1.35; font-weight: 800; letter-spacing: .01em; margin: 0 0 12px; text-wrap: balance; }
.byline { display: flex; flex-wrap: wrap; gap: 4px 16px; margin: 0 0 6px; font-size: 14px; color: var(--muted); }
.disclose { margin: 0 0 22px; font-size: 13px; color: var(--muted); }
.lead { font-size: 17px; color: #33495A; margin: 0 0 24px; }
.toc { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px 18px 16px; margin: 0 0 26px; }
.toc-title { margin: 0 0 6px; font-size: 14px; font-weight: 700; color: var(--ink); }
.toc ol { margin: 0; padding-inline-start: 1.3em; font-size: 15px; }
.toc li { margin: 3px 0; }
.toc a { color: var(--sky); text-decoration: none; }
.toc a:hover { text-decoration: underline; }
.prose { font-size: 17px; line-height: 1.95; color: #23323C; }
.prose h2 { font-family: var(--font-serif); font-size: 24px; line-height: 1.4; font-weight: 800; margin: 38px 0 12px; padding-inline-start: 12px; border-inline-start: 5px solid var(--vermilion); scroll-margin-top: 16px; }
.prose h3 { font-size: 18px; font-weight: 700; margin: 26px 0 6px; color: var(--ink); }
.prose p { margin: 0 0 1em; }
.prose ul, .prose ol { margin: 0 0 1.1em; padding-inline-start: 1.4em; }
.prose li { margin: .3em 0; }
.prose a { color: var(--sky); text-underline-offset: 3px; }
.prose a:hover { color: var(--vermilion-dark); }
.prose strong { color: var(--ink); }
.prose blockquote { margin: 1.2em 0; padding: 14px 18px; background: var(--note-bg); border-inline-start: 5px solid var(--note-line); border-radius: 10px; color: var(--note-ink); }
.prose blockquote p:last-child { margin-bottom: 0; }
.prose table { width: 100%; border-collapse: collapse; margin: 1em 0 1.4em; font-size: 15px; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--paper-deep); }
.article-cta { margin-top: 44px; padding: 24px 22px 26px; background: var(--paper-deep); border: 1px solid var(--line); border-radius: var(--radius); text-align: center; }
.article-cta h2 { font-family: var(--font-serif); font-size: 21px; font-weight: 800; margin: 0 0 6px; }
.article-cta p { margin: 0 auto 14px; max-width: 46ch; color: #33495A; }
.acta-actions { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 12px; }
.acta-actions .btn { min-height: 44px; padding: 0 18px; text-decoration: none; }
.acta-actions .store img { height: 44px; }
.cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px 20px 16px; box-shadow: var(--shadow); }
.card h2 { font-family: var(--font-serif); font-size: 21px; line-height: 1.4; margin: 0 0 6px; }
.card h2 a { color: var(--ink); text-decoration: none; }
.card h2 a:hover { color: var(--vermilion-dark); text-decoration: underline; }
.card p { margin: 0 0 6px; color: #33495A; }
.card-meta { font-size: 13px; color: var(--muted) !important; }
/* 首頁「延伸閱讀」 */
.read-more { margin-top: 26px; padding-top: 22px; border-top: 1px dashed var(--line); }
.read-more h2 { font-family: var(--font-serif); font-size: 24px; font-weight: 800; margin: 0 0 10px; }
.read-more ul { margin: 0 0 8px; padding-inline-start: 1.2em; }
.read-more li { margin: 4px 0; }
.read-more a { color: var(--sky); }
.read-more p { margin: 0; font-size: 14px; }
@media (min-width: 900px) { .article { padding-top: 40px; } }

/* ---------- 圖表 / 課程 ---------- */
.dg-han { font-family: "Kaiti TC", "STKaiti", "BiauKai", "DFKai-SB", "KaiTi", "Noto Serif HK", "Songti TC", serif; }
.dg-sans { font-family: var(--font-sans); }
.diagram { margin: 26px 0; padding: 14px 10px 10px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; text-align: center; }
.diagram svg { width: 100%; height: auto; display: block; margin-inline: auto; }
.diagram figcaption { margin-top: 8px; font-size: 14px; color: var(--muted); }
.lesson-banner { margin: 0 0 18px; border-radius: 18px; overflow: hidden; border: 1px solid var(--line); }
.lesson-banner svg { display: block; width: 100%; height: auto; max-height: 200px; }
.progress { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin: 0 0 14px; }
.progress-text { font-size: 14px; font-weight: 700; color: var(--vermilion-dark); }
.dots { display: inline-flex; gap: 6px; }
.dot { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: 50%; border: 1.5px solid var(--line); background: var(--card); color: var(--muted); font-size: 13px; font-weight: 700; text-decoration: none; }
.dot.is-done { background: var(--orange-soft); color: var(--vermilion-dark); border-color: #F0B9A5; }
.dot.is-on { background: var(--vermilion); color: #fff; border-color: var(--vermilion); }
.dot:hover { border-color: var(--vermilion); }
.lesson-nav { display: grid; gap: 12px; margin: 38px 0 0; }
.lesson-link { display: block; padding: 16px 18px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; text-decoration: none; color: var(--ink); box-shadow: var(--shadow); }
.lesson-link:hover { border-color: var(--vermilion); }
.lesson-link.next { text-align: right; background: var(--orange-soft); border-color: #F0B9A5; }
.ll-dir { display: block; font-size: 13px; font-weight: 700; color: var(--vermilion-dark); margin-bottom: 2px; }
.ll-title { display: block; font-family: var(--font-serif); font-size: 18px; font-weight: 800; line-height: 1.4; }
@media (min-width: 700px) { .lesson-nav { grid-template-columns: 1fr 1fr; } .lesson-nav .lesson-link:only-child { grid-column: 1 / -1; } }
.start { margin: 4px 0 26px; }
.start .btn { min-height: 48px; padding: 0 26px; font-size: 17px; text-decoration: none; }
.list-title { font-family: var(--font-serif); font-size: 22px; font-weight: 800; margin: 30px 0 12px; }
.lesson-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.lesson-card a { display: flex; align-items: center; gap: 14px; padding: 14px 16px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; text-decoration: none; color: var(--ink); box-shadow: var(--shadow); }
.lesson-card a:hover { border-color: var(--vermilion); }
.lc-num { flex: none; width: 40px; height: 40px; border-radius: 50%; background: var(--vermilion); color: #fff; font-weight: 800; font-size: 18px; display: inline-flex; align-items: center; justify-content: center; }
.lc-body { flex: 1; min-width: 0; }
.lc-title { display: block; font-family: var(--font-serif); font-size: 18px; font-weight: 800; line-height: 1.4; }
.lc-desc { display: block; font-size: 14px; color: var(--muted); margin-top: 2px; }
.lc-go { flex: none; font-size: 26px; color: var(--vermilion); }
.how { margin: 0; padding-inline-start: 1.3em; color: #33495A; }
.how li { margin: 6px 0; }
.how a { color: var(--sky); }
.bar-link[aria-current="page"] { text-decoration: underline; text-underline-offset: 6px; text-decoration-thickness: 2px; }
/* ---------- 課程總覽 ---------- */
.course-cards { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 18px; }
.course-card a { display: block; background: var(--card); border: 1px solid var(--line); border-radius: 18px; overflow: hidden; text-decoration: none; color: var(--ink); box-shadow: var(--shadow); }
.course-card a:hover { border-color: var(--vermilion); }
.cc-banner { display: block; line-height: 0; }
.cc-banner svg { display: block; width: 100%; height: auto; max-height: 200px; }
.cc-body { display: block; padding: 18px 20px 22px; }
.cc-title { display: block; font-family: var(--font-serif); font-size: 22px; font-weight: 800; line-height: 1.4; margin-bottom: 6px; }
.cc-desc { display: block; color: #33495A; margin-bottom: 8px; }
.cc-meta { display: block; font-size: 14px; color: var(--muted); margin-bottom: 10px; }
.cc-go { display: inline-block; font-weight: 700; color: var(--vermilion-dark); }