/* 文章頁：沿用 v0.5 + v0.6 系統 */

.art-head { max-width: 820px; margin: 0 auto; padding: 44px 40px 0; text-align: center; }
.art-head .crumb { font-size: 13px; color: var(--ink-3); }
.art-head .crumb a:hover { color: var(--orange); }
.art-head .topic { display: inline-block; margin-top: 22px; }
.art-head h1 { font-family: var(--serif); font-weight: 300; font-size: clamp(34px, 4vw, 54px); line-height: 1.25; color: var(--navy); margin-top: 12px; }
.art-head .dek { font-size: 18px; font-weight: 300; color: var(--ink-2); margin: 18px auto 0; max-width: 36em; }
.art-meta { display: flex; justify-content: center; flex-wrap: wrap; gap: 6px 18px; margin-top: 22px; font-size: 13.5px; color: var(--ink-3); }
.art-meta b { color: var(--ink); font-weight: 700; }
.art-hero { max-width: 1120px; margin: 36px auto 0; padding: 0 40px; }
.art-hero .tone { aspect-ratio: 21 / 9; border-radius: 10px; }
.art-hero figcaption { font-size: 12px; color: var(--ink-3); margin-top: 8px; }

.art-grid { max-width: 1240px; margin: 0 auto; padding: 48px 40px 24px; display: grid; grid-template-columns: 200px minmax(0, 680px) 220px; gap: 56px; justify-content: center; }

/* 左：目錄＋分享（固定） */
.toc { position: sticky; top: 24px; align-self: start; }
.toc h4, .rail h4 { font-size: 12px; font-weight: 700; letter-spacing: .14em; color: var(--orange); margin-bottom: 10px; }
.toc ol { list-style: none; padding: 0; margin: 0; border-left: 2px solid var(--line); }
.toc a { display: block; font-size: 13.5px; line-height: 1.5; color: var(--ink-3); padding: 7px 0 7px 14px; margin-left: -2px; border-left: 2px solid transparent; }
.toc a:hover { color: var(--ink); }
.toc a.on { color: var(--navy); font-weight: 700; border-left-color: var(--orange); }
.share { display: flex; gap: 8px; margin-top: 24px; }
.share span { width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--line); display: grid; place-items: center; font-size: 12px; font-weight: 700; color: var(--ink-2); cursor: pointer; }
.share span:hover { border-color: var(--navy); color: var(--navy); }

/* 右：這篇對應的 AI 代理元素（固定） */
.rail { position: sticky; top: 24px; align-self: start; }
.rail .box { border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.rail p { font-size: 13px; color: var(--ink-2); margin-bottom: 12px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips a { font-size: 13px; font-weight: 700; color: var(--white); padding: 6px 12px; border-radius: 8px; background: var(--navy); }
.chips a.human { background: var(--orange); }
.chips a.c2 { background: var(--navy-2); }
.rail .more-link { display: block; margin-top: 14px; font-size: 13px; font-weight: 700; color: var(--navy); }
.rail .more-link::after { content: " →"; }

/* 中：內文 */
.prose { font-size: 17px; line-height: 1.95; color: #1F2A40; }
.prose p { margin: 0 0 1.2em; }
.prose h2 { font-family: var(--serif); font-weight: 400; font-size: 28px; line-height: 1.4; color: var(--navy); margin: 2.2em 0 .8em; scroll-margin-top: 24px; }
.prose h3 { font-size: 19px; font-weight: 700; color: var(--ink); margin: 1.8em 0 .6em; }
.prose a { color: var(--navy); text-decoration: underline; text-decoration-color: var(--orange); text-underline-offset: 4px; }
.prose strong { color: var(--ink); }

.summary { border-radius: 12px; background: var(--tint); padding: 24px 28px; margin-bottom: 36px; }
.summary h4 { font-size: 13px; font-weight: 700; letter-spacing: .12em; color: var(--navy); margin-bottom: 12px; }
.summary ol { margin: 0; padding-left: 1.3em; }
.summary li { font-size: 16px; line-height: 1.75; margin-bottom: 8px; color: var(--ink); }
.summary li::marker { color: var(--orange); font-weight: 700; }

.pull { margin: 1.6em 0; padding: 4px 0 4px 22px; border-left: 4px solid var(--orange); font-family: var(--serif); font-size: 26px; line-height: 1.5; color: var(--navy); }

.table-wrap { overflow-x: auto; margin: 1.6em 0 1.8em; border: 1px solid var(--line); border-radius: 10px; }
.prose table { width: 100%; min-width: 620px; border-collapse: collapse; font-size: 14.5px; line-height: 1.65; }
.prose th { background: var(--navy); color: var(--white); font-weight: 700; padding: 12px 14px; text-align: left; }
.prose td { padding: 12px 14px; border-top: 1px solid var(--line); vertical-align: top; }
.prose tr td:first-child { font-weight: 700; color: var(--navy); background: #F7F8FA; }
.prose td:last-child { background: #FBF5F2; }

.inline-read { display: flex; gap: 14px; align-items: center; margin: 1.6em 0; padding: 14px 18px; border: 1px solid var(--line); border-radius: 10px; text-decoration: none !important; }
.inline-read span { font-size: 12px; font-weight: 700; letter-spacing: .1em; color: var(--orange); white-space: nowrap; }
.inline-read b { font-family: var(--serif); font-weight: 400; font-size: 17px; color: var(--ink); line-height: 1.45; }
.inline-read:hover { border-color: var(--navy); }

.todo { margin: 2em 0; border: 2px solid var(--navy); border-radius: 12px; padding: 22px 26px; }
.todo h4 { font-size: 13px; font-weight: 700; letter-spacing: .12em; color: var(--navy); margin-bottom: 10px; }
.todo ul { list-style: none; padding: 0; margin: 0; }
.todo li { position: relative; padding-left: 30px; margin-bottom: 8px; font-size: 16px; line-height: 1.7; }
.todo li::before { content: ""; position: absolute; left: 0; top: .35em; width: 16px; height: 16px; border: 2px solid var(--orange); border-radius: 4px; }

.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { list-style: none; cursor: pointer; padding: 16px 36px 16px 0; position: relative; font-weight: 700; font-size: 16.5px; color: var(--ink); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 12px; font-size: 22px; font-weight: 300; color: var(--orange); }
.faq details[open] summary::after { content: "−"; }
.faq details > div { padding: 0 0 16px; font-size: 16px; color: var(--ink-2); }

/* 文末 */
.art-end { max-width: 680px; margin: 0 auto; padding: 8px 0 0; }
.sources { border-top: 2px solid var(--navy); padding-top: 18px; margin-top: 12px; }
.sources h4, .author h4 { font-size: 12px; font-weight: 700; letter-spacing: .14em; color: var(--ink-3); margin-bottom: 10px; }
.sources ol { margin: 0; padding-left: 1.3em; font-size: 14px; color: var(--ink-2); }
.sources li { margin-bottom: 6px; }
.sources .note { font-size: 13px; color: var(--ink-3); }
.author { display: flex; gap: 16px; align-items: center; margin-top: 32px; padding: 20px; border-radius: 12px; background: #F7F7F6; }
.author .av { flex: 0 0 56px; height: 56px; border-radius: 50%; background: var(--navy); color: var(--white); display: grid; place-items: center; font-family: var(--serif); font-size: 22px; }
.author b { display: block; font-size: 16px; color: var(--ink); }
.author p { font-size: 13.5px; color: var(--ink-2); margin-top: 2px; }

.series-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 32px; }
.series-nav a { display: block; padding: 18px 20px; border: 1px solid var(--line); border-radius: 12px; }
.series-nav a:hover { border-color: var(--navy); }
.series-nav span { font-size: 12px; font-weight: 700; letter-spacing: .1em; color: var(--orange); }
.series-nav b { display: block; font-family: var(--serif); font-weight: 400; font-size: 17px; color: var(--ink); margin-top: 4px; line-height: 1.45; }
.series-nav a.next { text-align: right; }

.cta { max-width: 1120px; margin: 56px auto 0; padding: 0 40px; }
.cta-inner { display: grid; grid-template-columns: 1.2fr 2fr auto; gap: 32px; align-items: center; padding: 30px 34px; border-radius: 16px; border: 2px solid var(--navy); }
.cta-inner .kind { font-size: 12px; font-weight: 700; letter-spacing: .14em; color: var(--orange); }
.cta-inner h3 { font-family: var(--serif); font-weight: 400; font-size: 24px; color: var(--navy); line-height: 1.4; margin-top: 4px; }

.related { max-width: 1120px; margin: 56px auto 0; padding: 0 40px 72px; }

@media (max-width: 1100px) {
  .art-grid { grid-template-columns: minmax(0, 680px); }
  .toc, .rail { position: static; }
  .toc { order: 0; } .rail { order: 1; }
  .toc ol { display: none; }
  .cta-inner { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .art-head { padding: 28px 18px 0; }
  .art-hero, .cta, .related { padding-left: 18px; padding-right: 18px; }
  .art-hero .tone { aspect-ratio: 16 / 10; }
  .art-grid { padding: 32px 18px 16px; }
  .prose { font-size: 16.5px; }
  .pull { font-size: 21px; }
  .series-nav { grid-template-columns: 1fr; }
  .series-nav a.next { text-align: left; }
}