/* ================================================================
   頁面場景（2026-11 第二段 P3／P4）—— 閱讀頁、關於、工具、專案：每頁自己的一張背景畫布，內容仍是真 HTML
   兩種狀態：
   ・沒有 html.pg-on（無 JS、引擎沒起來、被擋）：完全是第一段的版面，本檔所有規則都以 .pg-on 開頭、不影響它。
   ・有 html.pg-on（head 內聯腳本在第一次繪製前就加上，所以不會位移）：頁首收成極簡外框（簽名、主題點、選單、返回地景），
     畫布在內容後面（fixed 或 absolute、pointer-events:none、aria-hidden），文字底下由引擎刮出留白（不加色塊、不加遮罩）。
   語言不變：只有線與點；無陰影／模糊／漸層；圓角 ≤ 2px。
   ================================================================ */

/* ---- 沒有場景時一律不顯示的東西 ---- */
.pg-stage, .pg-back, .pg-motion, .pg-cairns { display: none; }

/* ---- 舞台與畫布 ---- */
.pg-on .pg-stage { display: block; position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: clip; }
.pg-on .pg-stage canvas { display: block; position: absolute; left: 0; top: 0; width: 100%; height: 100%; opacity: 0; }
.pg-on .pg-stage canvas.is-ready { opacity: 1; transition: opacity .8s var(--ease-in-out); }
.pg-on .shell { position: relative; z-index: 1; display: flow-root; } /* flow-root：.page 的上緣 margin 不會穿出去把整個外殼推下來（絕對定位的外框要貼頁面左上角） */
/* 平板與手機的閱讀頁、關於：舞台只是頁首一條小景（隨頁面捲走），不佔閱讀空間 */
@media (max-width: 63.999rem) {
  .pg-on[data-pg="read"] .pg-stage, .pg-on[data-pg="about"] .pg-stage { position: absolute; inset: 0 0 auto 0; height: 7.75rem; }
}
/* 工具、專案：舞台貼在頁面左上角、隨頁面捲動（卡片與畫布同一個原點，座標才對得上） */
.pg-on[data-pg="tools"] .pg-stage, .pg-on[data-pg="projects"] .pg-stage { position: absolute; inset: 0 0 auto 0; height: 100svh; }
@media (max-width: 63.999rem) { .pg-on[data-pg="tools"] .pg-stage { height: 22rem; } }
@media (max-width: 39.999rem) { .pg-on[data-pg="projects"] .pg-stage { height: 28rem; } }
/* 工具子頁：頁首一整屏（隨頁面捲走）；平板與手機只有頁首一條，與閱讀頁、關於相同 */
.pg-on[data-pg="tool"] .pg-stage { position: absolute; inset: 0 0 auto 0; height: 100svh; }
@media (max-width: 63.999rem) { .pg-on[data-pg="tool"] .pg-stage { height: 7.75rem; } }

/* ---- 閱讀位置的訊號點（畫布外的一個真元素，捲動時只改 transform）：整屏唯一的訊號 ---- */
.pg-dot { display: none; }
.pg-on .pg-dot { display: block; position: absolute; left: 0; top: 0; width: 9px; height: 9px; margin: -4.5px 0 0 -4.5px; border-radius: 50%; background: var(--signal); opacity: 0; will-change: transform; }
.pg-on .pg-dot.on { opacity: 1; transition: opacity .6s; }
.pg-on .pg-dot::after { content: ""; position: absolute; inset: -4.5px; border: 1px solid var(--signal); border-radius: 50%; opacity: .35; }

/* ================================================================
   極簡外框：左上簽名 logo（連 /）、右上主題圓點、選單、（有環境動態的頁）暫停鈕、「← 返回地景」
   頁首不 sticky、隨頁面捲走（與第一段相同）；桌機的「選單」開同一份 #mobile-menu（全站導覽都在裡面），手機沿用底部導覽。
   ================================================================ */
.pg-on .site-header { position: absolute; inset: 0 0 auto 0; z-index: 50; height: 0; pointer-events: none; }
.pg-on :is(.header-outer, .header-mid, .header-inner, .header-pad, .header-col, .header-row, .hdr-left, .hdr-center, .hdr-right) { display: contents; }
.pg-on .desktop-nav { display: none; }
.pg-on .logo-link { position: absolute; top: 15px; left: 26px; z-index: 7; display: flex; align-items: center; width: 96px; height: 44px; pointer-events: auto; transition: opacity .3s; }
.pg-on .logo-link:hover { opacity: .7; }
.pg-on .logo-link svg { width: 100%; }
.pg-on .theme-btn { position: absolute; top: 12px; right: 16px; z-index: 6; width: 44px; height: 44px; margin: 0; pointer-events: auto; }
.pg-on .theme-btn svg { display: none; }
.pg-on .theme-btn::before { inset: auto; left: 50%; top: 50%; width: 11px; height: 11px; margin: -5.5px 0 0 -5.5px; border: 1.3px solid var(--c-title); transition: transform .25s; }
.pg-on .theme-btn:hover::before { transform: scale(1.4); }
.pg-on .menu-btn { display: flex; position: absolute; top: 12px; right: 108px; z-index: 6; height: 44px; margin: 0; padding: 0 .25rem; pointer-events: auto; }
@media (max-width: 39.999rem) { .pg-on .menu-btn { display: none; } }
.pg-on .mobile-menu:not([hidden]) { display: block; }
.pg-on .pg-motion { display: block; position: absolute; top: 12px; right: 60px; z-index: 6; width: 44px; height: 44px; padding: 0; border: 0; background: none; color: var(--c-title); cursor: pointer; opacity: 0; visibility: hidden; transition: opacity .6s; pointer-events: auto; }
.pg-on .pg-motion svg { display: block; width: 16px; height: 16px; margin: auto; opacity: .7; transition: opacity .25s; }
.pg-on .pg-motion:hover svg { opacity: 1; }
.pg-on.pg-shown .pg-motion { opacity: 1; visibility: visible; }
.pg-on .pg-motion[hidden] { visibility: hidden; pointer-events: none; } /* 不用 display:none：位置要一直在，場景第一次建構就把它的留白算進去（否則按鈕出現時留白改變、整張場景重建一次） */
.pg-motion[aria-pressed="false"] .i-play, .pg-motion[aria-pressed="true"] .i-pause { display: none; }
.pg-on .pg-back { display: flex; align-items: center; position: absolute; z-index: 5; left: .625rem; top: 7.375rem; min-height: 44px; padding: 0 6px; font-size: .875rem; letter-spacing: .06em; color: var(--c-note); text-decoration: none; transition: color .2s; }
.pg-on .pg-back:hover { color: var(--c-title); }
.pg-on .pg-back:focus-visible { outline: 1px solid var(--c-title); outline-offset: 3px; border-radius: 2px; }
@media (min-width: 40rem) { .pg-on .pg-back { left: 2.5rem; } }
@media (min-width: 64rem) { .pg-on .pg-back { left: 5rem; top: 6.5rem; font-size: .8125rem; } }
/* 頁尾壓在畫布上：實底（與頁面同色，看不出色塊），免得山稜穿過頁尾的字 */
.pg-on .site-footer { position: relative; background: var(--bg); }

/* ================================================================
   閱讀頁：左欄文章（第一段的文章樣板原封不動）、右側攀爬山稜
   ================================================================ */
@media (min-width: 64rem) {
  .pg-on[data-pg="read"] .article-wrap { padding-inline: 0; }
  .pg-on[data-pg="read"] .article-grid { max-width: none; margin: 0; padding: 12.5rem 2rem 0 5.375rem; }
  .pg-on[data-pg="read"] .terrain { display: none; } /* 桌機的山稜進度改畫在背景裡（右下） */
  /* 目錄在右側山稜上方的天空裡：整份目錄不捲動、不裁切——欄位上提到返回連結那一行、項目間距收緊，720 高也放得下 11 項 */
  .pg-on[data-pg="read"] .article-side { margin-top: -6rem; }
  .pg-on[data-pg="read"] .outline { max-width: 15rem; }
  .pg-on[data-pg="read"] .outline-title { margin-bottom: .5rem; }
  .pg-on[data-pg="read"] .outline a { padding-block: .125rem; line-height: 1.35; }
}
@media (max-width: 63.999rem) { .pg-on[data-pg="read"] .article-grid { margin-top: 10rem; } }

/* ================================================================
   關於：左欄真內容、右側肖像（sticky）＋山丘上的山屋；「與我聯繫」排到左欄底（只換位置、DOM 不動）
   ================================================================ */
@media (min-width: 64rem) {
  .pg-on[data-pg="about"] .page, .pg-on[data-pg="tools"] .page, .pg-on[data-pg="projects"] .page { margin-top: 9.5rem; padding-inline: 0; }
  .pg-on[data-pg="about"] .page-outer, .pg-on[data-pg="tools"] .page-outer, .pg-on[data-pg="projects"] .page-outer { max-width: none; padding-inline: 0; }
  .pg-on[data-pg="about"] .page-pad, .pg-on[data-pg="tools"] .page-pad, .pg-on[data-pg="projects"] .page-pad { padding-inline: 5.375rem 2rem; }
  .pg-on[data-pg="about"] .page-col, .pg-on[data-pg="tools"] .page-col, .pg-on[data-pg="projects"] .page-col { max-width: none; margin: 0; }
  .pg-on[data-pg="about"] .about-grid { grid-template-columns: minmax(0, 42rem) minmax(0, 1fr); column-gap: 5rem; }
  .pg-on[data-pg="about"] .about-grid .portrait-col { display: contents; }
  .pg-on[data-pg="about"] .about-grid .about-body { grid-column: 1; grid-row: 1; }
  .pg-on[data-pg="about"] .about-grid .contact-col { grid-column: 1; grid-row: 2; }
  .pg-on[data-pg="about"] .about-grid .portrait { grid-column: 2; grid-row: 1 / span 2; position: sticky; top: 6.5rem; align-self: start; justify-self: center; width: 16.5rem; max-width: none; }
}
@media (max-width: 63.999rem) {
  .pg-on[data-pg="about"] .page, .pg-on[data-pg="tools"] .page, .pg-on[data-pg="projects"] .page { margin-top: 10.5rem; }
}

/* ================================================================
   工具：滿版吊橋。四張卡片就是橋面的四塊木板（卡片的 h2 是木板、描述在板下）
   ================================================================ */
@media (min-width: 64rem) {
  .pg-on[data-pg="tools"] .site-main { min-height: max(100svh, 44rem); }
  .pg-on[data-pg="tools"] .hub-list { position: absolute; top: 58svh; left: 0; right: 0; width: min(74vw, 64rem); max-width: none; margin: 0 auto; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .75rem; }
}
.pg-on[data-pg="tools"] .hub-list li, .pg-on[data-pg="tools"] .hub-list li:last-child { border: 0; }
.pg-on[data-pg="tools"] .hub-list a { padding: 0; }
.pg-on[data-pg="tools"] .hub-list h2 {
  position: relative; display: flex; align-items: center; justify-content: center; height: 3.5rem; margin: 0; padding: 0 .5rem;
  border: 1px solid var(--c-strong); background: var(--bg); text-align: center; font-size: .9375rem; line-height: 1.35;
}
/* 木紋：板內上下各一條細線 */
.pg-on[data-pg="tools"] .hub-list h2::before, .pg-on[data-pg="tools"] .hub-list h2::after { content: ""; position: absolute; left: 6px; right: 6px; border-top: 1px solid var(--c-line); pointer-events: none; }
.pg-on[data-pg="tools"] .hub-list h2::before { top: 4px; }
.pg-on[data-pg="tools"] .hub-list h2::after { bottom: 4px; }
.pg-on[data-pg="tools"] .hub-list p { margin: 1.25rem 0 0; padding-inline: .25rem; font-size: .875rem; line-height: 1.75; }
.pg-on[data-pg="tools"] .hub-list .more { margin-top: .375rem; padding-inline: .25rem; }
@media (max-width: 63.999rem) {
  .pg-on[data-pg="tools"] .hub-list { margin-top: 8.5rem; max-width: 36rem; }
  .pg-on[data-pg="tools"] .hub-list li + li { margin-top: 1.25rem; }
}

/* ================================================================
   工具子頁（SayIt 中英、DuduRow、FB 排版）：內容原樣、只讓出頁首的外框空間；返回連結與 SayIt 的語言切換同一列
   ================================================================ */
.pg-on[data-pg="tool"] .sayit { margin-top: 7.375rem; }
.pg-on[data-pg="tool"] .page { margin-top: 10.5rem; }
@media (min-width: 64rem) { .pg-on[data-pg="tool"] .sayit { margin-top: 6.5rem; } .pg-on[data-pg="tool"] .page { margin-top: 9.5rem; } }
.pg-on[data-pg="tool"] .sy-dot, .pg-on[data-pg="tool"] .alt-list li.pick strong::before { background: none; border: 1px solid var(--c-strong); } /* SayIt「持續更新中」與 DuduRow「推薦」的點：此刻整屏唯一的訊號點是岸邊木板上那一個，這兩處改成空心圈 */

/* ================================================================
   專案：河灘上的石堆（畫布）＋石堆連結（真錨點）；第一屏是場景，卡片在下方
   ================================================================ */
.pg-on[data-pg="projects"] .page-title { min-height: calc(100svh - 12rem); }
@media (max-width: 39.999rem) { .pg-on[data-pg="projects"] .page-title { min-height: calc(28rem - 10.5rem); } }
.pg-on[data-pg="projects"] .projects-page { margin-top: 2rem; }
.pg-on .pg-cairns { display: block; position: absolute; left: 0; top: 0; width: 100%; z-index: 3; pointer-events: none; }
.pg-on .pg-cairn { position: absolute; display: block; min-width: 44px; min-height: 44px; pointer-events: auto; border-radius: 2px; color: var(--c-title); }
.pg-on .pg-cairn:focus-visible { outline: 1px solid var(--c-title); outline-offset: 3px; }
.pg-on .pg-cairn .lab { position: absolute; left: 50%; top: 100%; width: 150px; margin: 4px 0 0 -75px; text-align: center; text-wrap: balance; word-break: keep-all; font-size: .8125rem; line-height: 1.4; color: var(--c-note); }
.pg-on .pg-cairn:hover .lab, .pg-on .pg-cairn:focus-visible .lab { color: var(--c-title); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 4px; }
@media (max-width: 63.999rem) { .pg-on .pg-cairn .lab { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; } }
.pg-on[data-pg="projects"] .proj { scroll-margin-top: 6rem; }
/* 落地的地景脈絡：捲過首屏（html.pg-rail）後，石堆連結收成頂端一條固定的細景帶——河岸線＋縮小的石堆，目前所指的那座亮起、頭上是此刻唯一的訊號點；點帶上空白處回到頁首。
   位置沿用畫布上石堆的橫向座標（行內 left），只覆寫縱向；底色與頁面同色，看不出色塊。 */
.pg-on.pg-rail .pg-cairns { position: fixed; top: 0; left: 0; right: 0; width: auto; height: 3.5rem !important; z-index: 40; pointer-events: auto; cursor: pointer; background: var(--bg); border-bottom: 1px solid var(--c-line); }
.pg-on.pg-rail .pg-cairn { top: .375rem !important; height: 2.75rem !important; cursor: pointer; }
.pg-on.pg-rail .pg-cairn::before { content: ""; position: absolute; left: 50%; top: 50%; width: 1.25rem; height: 1.5rem; margin: -.625rem 0 0 -.625rem; background: var(--c-strong); -webkit-mask: var(--cairn) center / contain no-repeat; mask: var(--cairn) center / contain no-repeat; }
.pg-on.pg-rail .pg-cairn:is(:hover, :focus-visible)::before, .pg-on.pg-rail .pg-cairn[aria-current]::before { background: var(--c-title); }
.pg-on.pg-rail .pg-cairn[aria-current]::after { content: ""; position: absolute; left: 50%; top: 2px; width: 7px; height: 7px; margin-left: -3.5px; border-radius: 50%; background: var(--signal); }
.pg-on.pg-rail .pg-cairn .lab { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
:root { --cairn: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 24' fill='none' stroke='black' stroke-width='1.2'><ellipse cx='10' cy='20.5' rx='8.6' ry='2.6'/><ellipse cx='10' cy='14.6' rx='6.6' ry='2.4'/><ellipse cx='10' cy='9.4' rx='4.6' ry='2.1'/><ellipse cx='10' cy='5.2' rx='2.6' ry='1.7'/></svg>"); }

@media (prefers-reduced-motion: reduce) {
  .pg-on .pg-stage canvas.is-ready, .pg-on .pg-motion, .pg-on .pg-dot.on { transition: none; }
}