/* =====================================================================
   blog.css — 文章閱讀樣式
   ---------------------------------------------------------------------
   只服務內容管線產出的頁面（blog.html、blog/**）。
   沿用 brand.css 的 design tokens，不覆寫任何 .site-* 既有規則，
   避免影響評測、報告與其他手寫應用頁。
   ===================================================================== */

/* ---------- 文章頁頭 ---------- */

.post__head { padding: 2.4rem 0 1rem; }
.post__head .site-title { margin-bottom: .9rem; }

.post__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  align-items: center;
  margin-top: 1.2rem;
  color: rgba(20, 32, 51, .55);
  font-size: .88rem;
}
.post__meta span[aria-hidden] { color: rgba(20, 32, 51, .3); }

.post__cover {
  display: block;
  width: 100%;
  height: auto;
  margin: 1.6rem 0 .4rem;
  border-radius: 14px;
  border: 1px solid var(--brand-line);
}

/* ---------- 版面 ----------
   正文沿用頁頭的窄欄寬（site-container--narrow），左緣與大標題對齊。
   閱讀導覽以零高度 sticky 錨點浮在正文上，不占據文章排版空間。 */

.post__body-wrap { padding: .6rem 0 2.4rem; }

/* ---------- 文章收藏與個人書摘 ---------- */

.post-reading-library {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: .65rem 1rem;
  align-items: center;
  margin: 2.4rem 0 0;
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--brand-line);
  border-radius: 14px;
  background: rgba(255, 255, 255, .5);
}
.post-reading-library__copy { min-width: 0; }
.post-reading-library__eyebrow,
.post-reading-library__title { margin: 0; }
.post-reading-library__eyebrow {
  color: var(--brand-teal);
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .14em;
}
.post-reading-library__title {
  margin-top: .18rem;
  color: var(--brand-ink);
  font-family: "Noto Serif TC", serif;
  font-size: 1.05rem;
  font-weight: 700;
}
.post-reading-library__bookmark {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .55rem .9rem;
  border: 1px solid rgba(30, 145, 136, .35);
  border-radius: 999px;
  background: rgba(255, 255, 255, .72);
  color: var(--brand-teal);
  font: inherit;
  font-size: .86rem;
  font-weight: 800;
  cursor: pointer;
  transition: background .18s ease, border-color .18s ease, color .18s ease;
}
.post-reading-library__bookmark:hover { border-color: var(--brand-teal); background: rgba(30, 145, 136, .08); }
.post-reading-library__bookmark[data-saved="true"] {
  border-color: rgba(30, 145, 136, .55);
  background: rgba(30, 145, 136, .12);
  color: #14756f;
}
.post-reading-library__bookmark[data-saved="true"] .post-reading-library__bookmark-icon { font-size: 0; }
.post-reading-library__bookmark[data-saved="true"] .post-reading-library__bookmark-icon::after { content: "★"; font-size: 1rem; }
.post-reading-library__bookmark:disabled { cursor: wait; opacity: .62; }
.post-reading-library__bookmark:focus-visible,
.post-excerpt-action:focus-visible {
  outline: 3px solid rgba(30, 145, 136, .38);
  outline-offset: 2px;
}
.post-reading-library__hint,
.post-reading-library__status {
  margin: 0;
  color: rgba(20, 32, 51, .58);
  font-size: .8rem;
  line-height: 1.55;
}
.post-reading-library__hint { margin-top: .28rem; }
.post-reading-library__status {
  grid-column: 1 / -1;
  min-height: 1.25rem;
  color: #14756f;
}
.post-reading-library__status[data-tone="error"] { color: #9f3d35; }
.post-excerpt-action {
  position: fixed;
  z-index: 100;
  min-height: 44px;
  padding: .55rem .9rem;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 999px;
  background: var(--brand-ink);
  box-shadow: 0 12px 28px rgba(20, 32, 51, .24);
  color: #fff;
  font: inherit;
  font-size: .84rem;
  font-weight: 800;
  cursor: pointer;
}
.post-excerpt-action[hidden] { display: none; }
.post-excerpt-action:disabled { cursor: wait; opacity: .65; }
.post__body mark[data-saved-excerpt] {
  padding: .08em .03em;
  border-radius: .12em;
  background: rgba(123, 183, 224, .28);
  color: inherit;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

/* ---------- 浮空閱讀進度與目錄 ---------- */

.post-reading-nav {
  position: sticky;
  top: calc(4.25rem + .7rem);
  z-index: 40;
  height: 0;
  margin: 0;
  pointer-events: none;
  font-size: .9rem;
}
.post-reading-nav__details {
  position: absolute;
  top: 0;
  right: 0;
  width: min(22rem, calc(100vw - 2rem));
  pointer-events: none;
}
.post-reading-nav__summary {
  display: flex;
  width: 44px;
  min-height: 44px;
  margin-left: auto;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 0;
  border: 1px solid rgba(20, 32, 51, .14);
  border-radius: 12px;
  background: rgba(251, 248, 242, .95);
  box-shadow: 0 9px 26px rgba(20, 32, 51, .11);
  backdrop-filter: blur(14px);
  color: var(--brand-ink);
  cursor: pointer;
  list-style: none;
  overflow: hidden;
  pointer-events: auto;
  transition: width .18s ease, border-color .18s ease, background .18s ease, box-shadow .18s ease;
}
.post-reading-nav__summary::-webkit-details-marker { display: none; }
.post-reading-nav__summary:hover,
.post-reading-nav__summary:focus-visible,
.post-reading-nav__details[open] .post-reading-nav__summary {
  width: 126px;
  justify-content: flex-start;
  gap: .55rem;
  padding: .55rem .75rem .55rem .7rem;
  border-color: rgba(30, 145, 136, .42);
  background: rgba(255, 255, 255, .97);
}
.post-reading-nav__summary:focus-visible {
  outline: 3px solid rgba(30, 145, 136, .38);
  outline-offset: 2px;
}
.post-reading-nav__details[open] .post-reading-nav__summary {
  border-color: rgba(30, 145, 136, .5);
  box-shadow: 0 10px 30px rgba(20, 32, 51, .14);
}
.post-reading-nav__icon {
  width: 1.08rem;
  height: 1.08rem;
  overflow: visible;
  fill: none;
  stroke: var(--brand-teal);
  stroke-width: 1.8;
  stroke-linecap: round;
}
.post-reading-nav__label {
  max-width: 0;
  overflow: hidden;
  opacity: 0;
  font-weight: 850;
  letter-spacing: .04em;
  white-space: nowrap;
  transition: max-width .18s ease, opacity .12s ease;
}
.post-reading-nav__summary-percent {
  max-width: 0;
  overflow: hidden;
  opacity: 0;
  color: rgba(20, 32, 51, .52);
  font-size: .72rem;
  font-weight: 750;
  text-align: right;
  white-space: nowrap;
  transition: max-width .18s ease, opacity .12s ease;
}
.post-reading-nav__summary:hover .post-reading-nav__label,
.post-reading-nav__summary:focus-visible .post-reading-nav__label,
.post-reading-nav__details[open] .post-reading-nav__label {
  max-width: 3rem;
  opacity: 1;
}
.post-reading-nav__summary:hover .post-reading-nav__summary-percent,
.post-reading-nav__summary:focus-visible .post-reading-nav__summary-percent,
.post-reading-nav__details[open] .post-reading-nav__summary-percent {
  max-width: 2.8rem;
  padding-left: .55rem;
  border-left: 1px solid var(--brand-line);
  opacity: 1;
}
.post-reading-nav__eyebrow,
.post-reading-nav__title {
  color: var(--brand-teal);
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .16em;
}
.post-reading-nav__current {
  margin: .18rem 0 0;
  color: var(--brand-ink);
  font-weight: 700;
  line-height: 1.45;
}
.post-reading-nav__panel {
  position: absolute;
  top: calc(100% + .5rem);
  right: 0;
  width: 100%;
  max-height: min(55vh, 28rem);
  overflow-y: auto;
  padding: 1rem 1rem 1.05rem;
  border: 1px solid var(--brand-line);
  border-radius: 14px;
  background: rgba(251, 248, 242, .99);
  box-shadow: 0 18px 42px rgba(20, 32, 51, .15);
  overscroll-behavior: contain;
  pointer-events: auto;
}
.post-reading-nav__details[data-placement="up"] .post-reading-nav__panel {
  top: auto;
  bottom: calc(100% + .5rem);
}
.post-reading-nav__panel-head { margin-bottom: .75rem; }
.post-reading-nav__progress {
  height: 3px;
  margin: 0 0 .9rem;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(30, 145, 136, .12);
}
.post-reading-nav__progress-value {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--brand-teal);
  transition: width .12s linear;
}
.post-reading-nav__title { margin: 0 0 .65rem; }
.post-reading-nav ol { margin: 0; padding: 0; list-style: none; }
.post-reading-nav li { margin: 0; }
.post-reading-nav a {
  display: block;
  padding: .32rem 0 .32rem .4rem;
  color: rgba(20, 32, 51, .62);
  text-decoration: none;
  line-height: 1.5;
  border-left: 2px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.post-reading-nav a:hover { color: var(--brand-ink); }
.post-reading-nav a:focus-visible {
  outline: 2px solid rgba(30, 145, 136, .45);
  outline-offset: 2px;
}
.post-reading-nav a[aria-current="true"] {
  color: var(--brand-teal);
  border-left-color: var(--brand-teal);
  font-weight: 700;
}
.post-reading-nav__l3 a { padding-left: 1.5rem; font-size: .85rem; }

@media (max-width: 520px) {
  .post-reading-library { grid-template-columns: 1fr; align-items: start; }
  .post-reading-library__bookmark { justify-self: start; }
  .post-reading-library__status { grid-column: 1; }
  .post-reading-nav { top: calc(4.25rem + .45rem); }
  .post-reading-nav__details { width: min(20rem, calc(100vw - 2rem)); }
  .post-reading-nav__summary {
    width: 44px;
    justify-content: center;
    gap: 0;
    padding: 0;
  }
  .post-reading-nav__summary:hover,
  .post-reading-nav__summary:focus-visible,
  .post-reading-nav__details[open] .post-reading-nav__summary {
    width: 44px;
    justify-content: center;
    gap: 0;
    padding: 0;
  }
  .post-reading-nav__label,
  .post-reading-nav__summary-percent { display: none; }
  .post-reading-nav__panel { max-height: 58vh; }
}

/* ---------- 正文排版 ---------- */

.post__body {
  color: rgba(20, 32, 51, .86);
  font-size: 1.04rem;
  line-height: 1.95;
}
.post__body > *:first-child { margin-top: 0; }

.post__body h2 {
  margin: 2.8rem 0 1rem;
  font-family: "Noto Serif TC", serif;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--brand-ink);
  scroll-margin-top: 9.75rem;
}
.post__body h3 {
  margin: 2rem 0 .8rem;
  font-family: "Noto Serif TC", serif;
  font-size: 1.18rem;
  font-weight: 700;
  line-height: 1.65;
  color: var(--brand-ink);
  scroll-margin-top: 9.75rem;
}
.post__body h4 {
  margin: 1.6rem 0 .6rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--brand-ink);
}

.post__body p { margin: 0 0 1.35rem; }

.post__body a {
  color: var(--brand-teal);
  text-decoration: underline;
  text-underline-offset: .22em;
  text-decoration-thickness: 1px;
}
.post__body a:hover { color: var(--brand-ink); }

.post__body strong { font-weight: 700; color: var(--brand-ink); }

.post__body ul,
.post__body ol { margin: 0 0 1.35rem; padding-left: 1.4rem; }
.post__body li { margin: .4rem 0; }
.post__body li > ul,
.post__body li > ol { margin: .4rem 0; }

.post__body blockquote {
  margin: 1.8rem 0;
  padding: .3rem 0 .3rem 1.3rem;
  border-left: 3px solid var(--brand-teal);
  color: rgba(20, 32, 51, .68);
  font-family: "Noto Serif TC", serif;
}
.post__body blockquote p:last-child { margin-bottom: 0; }

.post__body hr {
  margin: 2.6rem 0;
  border: 0;
  border-top: 1px solid var(--brand-line);
}

.post__body img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.8rem auto;
  border-radius: 12px;
  border: 1px solid var(--brand-line);
}

/* 作者嵌入的 HTML（iframe：Accupass 報名、Google 文件、YouTube 等） */
.post__body iframe {
  display: block;
  max-width: 100%;
  margin: 1.8rem 0;
  border: 0;
  border-radius: 12px;
}

.post__body code {
  padding: .12em .4em;
  border-radius: 5px;
  background: rgba(20, 32, 51, .07);
  font-size: .92em;
}
.post__body pre {
  margin: 1.8rem 0;
  padding: 1.1rem 1.2rem;
  border-radius: 12px;
  background: var(--brand-ink);
  color: #E8EEF5;
  overflow-x: auto;
  line-height: 1.7;
}
.post__body pre code { padding: 0; background: none; color: inherit; }

/* 寬內容不得撐破頁面，一律自行捲動 */
.post__body table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 1.8rem 0;
  font-size: .95rem;
}
.post__body th,
.post__body td {
  padding: .6rem .8rem;
  border: 1px solid var(--brand-line);
  text-align: left;
  vertical-align: top;
}
.post__body th { background: var(--brand-sand); font-weight: 700; color: var(--brand-ink); }

/* ---------- 標籤 ---------- */

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}
.post-tags li {
  padding: .28rem .7rem;
  border: 1px solid var(--brand-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .55);
  color: rgba(20, 32, 51, .6);
  font-size: .8rem;
}

/* ---------- 列表卡片 ---------- */

.post-card a { display: block; color: inherit; text-decoration: none; }
.post-card__cover {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: .9rem;
  border: 1px solid var(--brand-line);
}

/* ---------- 減少動態偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  .post-reading-library__bookmark,
  .post-reading-nav a,
  .post-reading-nav__summary,
  .post-reading-nav__progress-value { transition: none; }
}