/* =========================================================
   全慧文理短期補習班 — blog.css
   部落格列表與文章頁，沿用 style.css 的色票與元件
   ========================================================= */

.blog-main { background: var(--c-sky-soft); padding-block: 28px 64px; }

/* ---------- 麵包屑 ---------- */
.breadcrumb { font-size: .875rem; color: var(--c-muted); margin-bottom: 16px; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: .25em .5em; }
.breadcrumb li + li::before { content: "›"; margin-right: .5em; color: var(--c-muted); }
.breadcrumb a { color: var(--c-ink-soft); text-decoration: none; }
.breadcrumb a:hover { color: var(--c-royal); text-decoration: underline; }

/* ---------- 列表頁 ---------- */
.blog-hero { text-align: center; margin-bottom: 28px; }
.blog-hero .section-lead { margin-top: 8px; }
.post-list { display: grid; gap: 18px; }
.post-card {
  background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-sm);
  border: 1px solid var(--c-border);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}
.post-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.post-card a { display: block; padding: 20px 22px; color: inherit; text-decoration: none; }
.post-card-tag {
  display: inline-block; font-size: .75rem; font-weight: 700; letter-spacing: .06em;
  color: var(--c-royal); background: var(--c-sky); border-radius: var(--radius-pill); padding: 2px 10px;
}
.post-card-title { font-size: 1.1875rem; font-weight: 900; line-height: 1.5; color: var(--c-royal); margin: 10px 0 6px; }
.post-card-excerpt { color: var(--c-ink-soft); font-size: .9375rem; }
.post-card-meta { margin-top: 10px; font-size: .8125rem; color: var(--c-muted); }

/* ---------- 文章頁 ---------- */
.article {
  background: #fff; border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
  padding: 24px 20px 32px; max-width: 820px; margin-inline: auto;
}
.article-head { border-bottom: 1px solid var(--c-border); padding-bottom: 18px; margin-bottom: 24px; }
.article-title {
  font-size: clamp(1.5rem, 5vw, 2.125rem); font-weight: 900; line-height: 1.4; color: var(--c-royal);
  margin-top: 10px;
}
.article-meta { margin-top: 10px; font-size: .875rem; color: var(--c-muted); display: flex; flex-wrap: wrap; gap: .25em 1em; }

.article-body { font-size: 1.0625rem; line-height: 1.95; }
.article-body > * + * { margin-top: 1.1em; }
.article-body h2 {
  font-size: 1.4375rem; font-weight: 900; line-height: 1.45; color: var(--c-royal);
  margin-top: 2.2em; padding-left: 14px; border-left: 6px solid var(--c-orange);
}
.article-body h3 { font-size: 1.1875rem; font-weight: 900; color: var(--c-ink); margin-top: 1.6em; }
.article-body ul, .article-body ol { padding-left: 1.4em; }
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li + li { margin-top: .4em; }
.article-body li::marker { color: var(--c-orange); font-weight: 700; }
.article-body strong { color: var(--c-ink); background: linear-gradient(transparent 62%, rgba(255, 227, 77, .7) 0); }

/* 重點摘要（給讀者與 AI 擷取的答案區） */
.key-answer {
  background: var(--c-sky-soft); border: 2px solid var(--c-sky); border-radius: var(--radius);
  padding: 18px 20px;
}
.key-answer-title { font-weight: 900; color: var(--c-royal); margin-bottom: 8px; font-size: 1.0625rem; }
.key-answer ol { margin-top: 6px; }

.toc { border: 1px dashed var(--c-border); border-radius: var(--radius); padding: 14px 20px; font-size: .9375rem; }
.toc-title { font-weight: 900; color: var(--c-ink-soft); }
.toc ol { margin-top: 6px; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }

.note {
  background: #fff8db; border-left: 6px solid var(--c-yellow); border-radius: var(--radius-sm);
  padding: 12px 16px; font-size: .9375rem;
}

/* 表格：手機可橫向捲動 */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.article-body table { width: 100%; min-width: 520px; border-collapse: collapse; font-size: .9375rem; line-height: 1.7; }
.article-body th, .article-body td { border: 1px solid var(--c-border); padding: 10px 12px; text-align: left; vertical-align: top; }
.article-body thead th { background: var(--c-royal); color: #fff; font-weight: 700; }
.article-body tbody tr:nth-child(even) { background: var(--c-sky-soft); }

/* FAQ */
.faq details {
  border: 1px solid var(--c-border); border-radius: var(--radius-sm); padding: 0 16px; background: #fff;
}
.faq details + details { margin-top: 10px; }
.faq summary {
  cursor: pointer; font-weight: 700; padding: 14px 0; list-style: none; position: relative; padding-right: 28px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "＋"; position: absolute; right: 0; top: 14px; color: var(--c-orange); font-weight: 900; }
.faq details[open] summary::after { content: "－"; }
.faq details > div { padding-bottom: 14px; color: var(--c-ink-soft); }

/* 文末 CTA */
.article-cta {
  margin-top: 2.4em; text-align: center; border-radius: var(--radius);
  background: linear-gradient(180deg, var(--c-sky) 0%, var(--c-sky-soft) 100%); padding: 24px 18px;
}
.article-cta h2 { border: 0; padding: 0; margin: 0; text-align: center; }
.article-cta p { margin-top: 8px; color: var(--c-ink-soft); }
.article-cta-btns { margin-top: 16px; display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }

.article-foot { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--c-border); font-size: .875rem; color: var(--c-muted); }
.related { max-width: 820px; margin: 28px auto 0; }

@media (min-width: 768px) {
  .blog-main { padding-block: 40px 88px; }
  .post-list { grid-template-columns: 1fr 1fr; }
  .article { padding: 40px 48px 48px; }
}
@media (min-width: 1024px) {
  .post-list { grid-template-columns: repeat(3, 1fr); }
}