/* 站台樣式微調（由 scripts/build-site.mjs 複製進 .site-src/assets/）。 */

/* 頁尾列與左側導覽重疊：Material 的 .md-sidebar--primary 是 sticky、可視高度貼齊視窗，
   捲到頁底時 .md-footer-meta 進入同一段視窗空間；頁尾在 DOM 後方、繪製於上層，
   於是把導覽最後幾項蓋掉。此站不需要 footer meta（產生器標示已由 extra.generator
   關閉、亦未設 copyright），整條隱藏即可同時解掉重疊與空白列。
   上下頁導覽 .md-footer__inner 不受影響，保留。
   ⚠️ 日後若要在頁尾放內容（copyright、連結等），重疊會跟著回來——sticky 側欄的可視
   區仍延伸到視窗底部，屆時要改的是側欄高度而不是把這條註解刪掉了事。 */
.md-footer-meta {
  display: none;
}

/* 側欄捲不到底：Material 靠 JS 替 .md-sidebar__scrollwrap 定高，但在本站的部分頁面
   （實測根層 版權.html 正常 1114px、兩層深的 程式架構/程式流程/chat-system.html 卻是
   3028px）沒有套用。容器高度等於內容高度時內部就無可捲空間，而外層是 sticky、不隨頁面
   移動，於是視窗以下的導覽項目永遠碰不到。
   這裡不依賴那段 JS，直接以 CSS 把可視高度鎖進視窗；導覽比視窗高時自然出現內部捲軸。
   4.8rem ＝ 標頭 2.4rem ＋ 上下留白，Material 的 1rem 為 20px。 */
.md-sidebar__scrollwrap {
  max-height: calc(100vh - 4.8rem);
  overflow-y: auto;
}

/* Mermaid 保留自然尺寸，文章內直接捲動；固定框讓具名放大按鈕不隨圖面水平捲動。 */
.o4-mermaid-frame {
  position: relative;
  max-width: 100%;
  margin: 1em 0;
  padding-top: 2.6rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.4rem;
}

.o4-mermaid-frame > .mermaid-diagram {
  max-width: 100%;
  margin: 0;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  padding: 0 0.8rem 0.8rem;
  border: 0;
  scrollbar-gutter: stable;
}

.mermaid-diagram > svg {
  display: block;
  max-width: none;
  height: auto;
}

.mermaid-diagram:focus-visible {
  outline: 0.12rem solid var(--md-accent-fg-color);
  outline-offset: 0.12rem;
}

.o4-mermaid-viewer-button {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  z-index: 1;
  min-height: 1.7rem;
  padding: 0.25rem 0.65rem;
  border: 1px solid var(--md-primary-fg-color);
  border-radius: 999px;
  background: var(--md-default-bg-color);
  color: var(--md-primary-fg-color);
  cursor: pointer;
  font: inherit;
  font-size: 0.68rem;
  font-weight: 700;
}

.o4-mermaid-viewer-button:hover,
.o4-mermaid-viewer-button:focus-visible,
.o4-mermaid-dialog__control:hover,
.o4-mermaid-dialog__control:focus-visible {
  background: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
  outline: 0.12rem solid var(--md-accent-fg-color);
  outline-offset: 0.1rem;
}

.o4-mermaid-dialog {
  width: min(96vw, 90rem);
  height: min(92vh, 60rem);
  max-width: none;
  max-height: none;
  padding: 0;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.6rem;
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  box-shadow: 0 1rem 3rem rgb(0 0 0 / 35%);
}

.o4-mermaid-dialog::backdrop {
  background: rgb(0 0 0 / 62%);
}

.o4-mermaid-dialog__toolbar {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  justify-content: flex-end;
  gap: 0.4rem;
  padding: 0.55rem;
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
  background: var(--md-default-bg-color);
}

.o4-mermaid-dialog__control {
  min-width: 3.2rem;
  min-height: 1.8rem;
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--md-primary-fg-color);
  border-radius: 0.25rem;
  background: var(--md-default-bg-color);
  color: var(--md-primary-fg-color);
  cursor: pointer;
  font: inherit;
  font-size: 0.72rem;
  font-weight: 700;
}

.o4-mermaid-dialog__viewport {
  width: 100%;
  height: calc(100% - 3rem);
  overflow: auto;
  padding: 1rem;
  overscroll-behavior: contain;
}

.o4-mermaid-dialog__viewport > svg {
  display: block;
  max-width: none;
  transform-origin: top left;
}

@media print {
  .o4-mermaid-frame {
    margin: 1em 0;
    padding: 0;
    border: 0;
  }

  .mermaid-diagram {
    overflow: visible;
    padding: 0;
    border: 0;
  }

  .mermaid-diagram > svg {
    width: auto !important;
    max-width: 100%;
    height: auto !important;
  }

  .o4-mermaid-viewer-button,
  .o4-mermaid-dialog {
    display: none !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  .o4-mermaid-viewer-button,
  .o4-mermaid-dialog__control {
    scroll-behavior: auto;
    transition: none;
  }
}

/* 首頁專案沿革：以賽道／路書為語彙的純 CSS 時間線。
   HTML 由 history:generate 產生；data-side 明確記錄左右位置，避免年份節點改變
   :nth-child 的計數後破壞交錯順序。 */
.o4-project-timeline {
  --o4-timeline-accent: var(--md-primary-fg-color);
  --o4-timeline-rail: color-mix(
    in srgb,
    var(--md-primary-fg-color) 58%,
    var(--md-default-fg-color--lighter)
  );
  --o4-timeline-stagger: 7.5rem;
  margin: 2.4rem 0 3rem;
}

.md-typeset ol.o4-project-timeline__list {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 3rem minmax(0, 1fr);
  gap: 1.15rem 0;
  margin: 0;
  padding: 0 0 calc(var(--o4-timeline-stagger) + 1rem);
  list-style: none;
}

.o4-project-timeline__list::before {
  position: absolute;
  inset: 0 auto 0 50%;
  width: 0.16rem;
  border-radius: 999px;
  background: linear-gradient(
    to bottom,
    transparent,
    var(--o4-timeline-rail) 1.4rem,
    var(--o4-timeline-rail) calc(100% - 1.4rem),
    transparent
  );
  content: "";
  transform: translateX(-50%);
}

.o4-project-timeline__year {
  z-index: 1;
  grid-column: 2;
  justify-self: center;
  margin: 0.55rem 0 0.15rem;
  padding: 0;
  list-style: none;
}

.md-typeset ol.o4-project-timeline__list > li.o4-project-timeline__year {
  margin: 0.55rem 0 0.15rem;
}

.o4-project-timeline__year > span {
  display: inline-flex;
  min-width: 2.7rem;
  min-height: 2rem;
  align-items: center;
  justify-content: center;
  border: 0.12rem solid var(--o4-timeline-accent);
  border-radius: 999px;
  background: var(--md-default-bg-color);
  color: var(--o4-timeline-accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.o4-project-timeline__item {
  position: relative;
  min-width: 0;
  margin: 0;
  padding: 1rem 1.1rem 0.95rem;
  border: 1px solid
    color-mix(in srgb, var(--md-default-fg-color) 16%, transparent);
  border-radius: 0.65rem;
  background:
    linear-gradient(
      135deg,
      color-mix(in srgb, var(--o4-timeline-accent) 7%, transparent),
      transparent 45%
    ),
    var(--md-default-bg-color);
  box-shadow: 0 0.28rem 0.9rem
    color-mix(in srgb, var(--md-default-fg-color) 9%, transparent);
  list-style: none;
}

.md-typeset ol.o4-project-timeline__list > li.o4-project-timeline__item {
  margin: 0;
}

.o4-project-timeline__item[data-side="left"] {
  grid-column: 1;
}

.o4-project-timeline__item[data-side="right"] {
  grid-column: 3;
  /* 固定位移避免各列內容高度不同時，同側卡片互相重疊。 */
  transform: translateY(var(--o4-timeline-stagger));
}

.o4-project-timeline__item::before {
  position: absolute;
  top: 1.18rem;
  z-index: 2;
  width: 0.62rem;
  height: 0.62rem;
  border: 0.14rem solid var(--md-default-bg-color);
  border-radius: 50%;
  background: var(--o4-timeline-accent);
  box-shadow: 0 0 0 0.1rem var(--o4-timeline-rail);
  content: "";
}

.o4-project-timeline__item::after {
  position: absolute;
  top: 1.48rem;
  width: 1.5rem;
  height: 0.08rem;
  background: var(--o4-timeline-rail);
  content: "";
}

.o4-project-timeline__item[data-side="left"]::before {
  right: -1.85rem;
}

.o4-project-timeline__item[data-side="left"]::after {
  right: -1.5rem;
}

.o4-project-timeline__item[data-side="right"]::before {
  left: -1.85rem;
}

.o4-project-timeline__item[data-side="right"]::after {
  left: -1.5rem;
}

.o4-project-timeline__item[data-importance="5"] {
  border-color: color-mix(in srgb, var(--o4-timeline-accent) 55%, transparent);
  box-shadow:
    inset 0.18rem 0 0 var(--o4-timeline-accent),
    0 0.32rem 1rem
      color-mix(in srgb, var(--o4-timeline-accent) 16%, transparent);
}

.o4-project-timeline__date {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--o4-timeline-accent);
  font-family: var(--md-code-font-family);
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.o4-project-timeline__item > p {
  margin: 0.45rem 0 0;
  color: var(--md-default-fg-color--light);
  font-size: 0.76rem;
  line-height: 1.65;
  overflow-wrap: anywhere;
}

.o4-project-timeline__item > p:first-of-type {
  margin-top: 0;
  color: var(--md-default-fg-color);
  font-size: 0.9rem;
  line-height: 1.4;
}

.o4-project-timeline__item a {
  text-underline-offset: 0.16em;
}

.o4-project-timeline__item a:focus-visible {
  border-radius: 0.15rem;
  outline: 0.14rem solid var(--o4-timeline-accent);
  outline-offset: 0.15rem;
}

@media screen and (max-width: 52rem) {
  .md-typeset ol.o4-project-timeline__list {
    grid-template-columns: 1.4rem minmax(0, 1fr);
    gap: 0.9rem 0;
    padding: 0;
  }

  .o4-project-timeline__list::before {
    left: 0.7rem;
  }

  .o4-project-timeline__year {
    grid-column: 1 / -1;
    justify-self: start;
  }

  .o4-project-timeline__year > span {
    min-width: 2.8rem;
    transform: translateX(-0.7rem);
  }

  .o4-project-timeline__item[data-side="left"],
  .o4-project-timeline__item[data-side="right"] {
    grid-column: 2;
    transform: none;
  }

  .o4-project-timeline__item[data-side="left"]::before,
  .o4-project-timeline__item[data-side="right"]::before {
    right: auto;
    left: -0.97rem;
  }

  .o4-project-timeline__item[data-side="left"]::after,
  .o4-project-timeline__item[data-side="right"]::after {
    right: auto;
    left: -0.7rem;
    width: 0.7rem;
  }
}