@font-face { font-family: "FP"; src: url("../fonts/fp12.woff2") format("woff2"), url("../../fonts/fp12.otf") format("opentype"); font-display: swap; }
@font-face { font-family: "NB"; src: url("../fonts/nb.woff2") format("woff2"), url("../../fonts/NotoSansTC-Black.ttf") format("truetype"); font-weight: 900; font-display: swap; }
:root {
  --ink: #16120F; --ink-2: #463C33; --ink-3: #85776A;
  --cream: #EFE3C8; --card: #F6EEDB; --orange: #E64B13; --orange-soft: #F3C4AC;
  --grid: rgba(22,18,15,.07);
  --pix: "FP", ui-monospace, monospace;
  --nb: "NB", "PingFang TC", "Noto Sans TC", sans-serif;
  --sans: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0; color: var(--ink); font-family: var(--sans); font-size: 17px; line-height: 1.85;
  background-color: var(--cream);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-font-smoothing: antialiased;
}
/* 紙紋＋墨點（同公開畫面 #paper） */
body::after {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 100; mix-blend-mode: multiply; opacity: .32;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='320' height='320'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .09 0 0 0 0 .07 0 0 0 0 .06 0 0 0 1.6 -.75'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}
a { color: var(--orange); }
.pix { font-family: var(--pix); letter-spacing: .04em; }
@keyframes blink { 50% { opacity: 0; } }
@keyframes pop { from { transform: scale(.2) rotate(var(--r, 0deg)); opacity: 0; } to { transform: scale(1) rotate(var(--r, 0deg)); opacity: 1; } }

/* ── 對話框（同公開畫面：墨黑標題列＋米白內容＋墨黑框＋硬投影＋閃爍 ▼） ── */
.dlg { position: relative; background: var(--card); border: 3px solid var(--ink); box-shadow: 6px 6px 0 var(--ink); }
.dlg > .hd { display: flex; justify-content: space-between; gap: 12px; align-items: center; background: var(--ink); color: var(--cream); font-family: var(--pix); font-size: 13px; letter-spacing: .05em; padding: 5px 12px; line-height: 1.5; }
.dlg > .hd span:last-child { color: var(--orange); }
.dlg > .bd { padding: 16px 18px 20px; }
.dlg .tri { position: absolute; right: 12px; bottom: 4px; color: var(--orange); font-size: 13px; font-style: normal; animation: blink 1s steps(1) infinite; line-height: 1; }
.dlg.or { border-color: var(--orange); box-shadow: 6px 6px 0 var(--orange); }
.dlg.or > .hd { background: var(--orange); }
.dlg.or > .hd span:last-child { color: var(--ink); }

/* ── 頂部進度＋版面 ── */
#bar { position: fixed; top: 0; left: 0; right: 0; height: 5px; z-index: 60; }
#bar i { display: block; height: 100%; width: 0; background: var(--orange); }
.wrap { position: relative; display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 52px; max-width: 1100px; margin: 0 auto; padding: 0 24px; }
nav.toc { position: sticky; top: 0; align-self: start; height: 100vh; padding: 36px 0 24px; overflow-y: auto; }
.toc .dlg > .bd { padding: 6px 0; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc a { display: grid; grid-template-columns: 34px 1fr; gap: 2px; padding: 6px 12px 6px 10px; color: var(--ink-2); text-decoration: none; font-size: 14px; line-height: 1.5; transition: background .15s, color .15s; }
.toc a span { font-family: var(--pix); font-size: 12px; color: var(--ink-3); padding-top: 1px; }
.toc a em { font-style: normal; }
.toc a:hover { background: rgba(22,18,15,.06); color: var(--ink); }
.toc a.on { background: var(--ink); color: var(--cream); }
.toc a.on span { color: var(--orange); }
.toc .hw { font-family: var(--pix); font-size: 10px; color: var(--orange); margin-left: 4px; font-style: normal; white-space: nowrap; }
.toc .me { margin-top: 18px; }
.toc .me .bd { display: flex; gap: 10px; align-items: center; padding: 10px 12px !important; }
.toc .me img { width: 48px; height: 48px; background: var(--orange); border: 2px solid var(--ink); image-rendering: pixelated; flex: none; }
.toc .me b { display: block; font-size: 14px; line-height: 1.4; }
.toc .me small { font-family: var(--pix); font-size: 11px; color: var(--ink-3); }
main { min-width: 0; max-width: 720px; padding: 36px 0 140px; }

/* ── 章首 ── */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 28px; align-items: end; padding: 8px 0 24px; }
.route { grid-column: 1 / -1; margin-bottom: 18px; min-width: 0; }
.hero > * { min-width: 0; }
.route .bd { display: flex; align-items: flex-start; padding: 16px 14px 12px !important; overflow-x: auto; }
.route .st { flex: none; display: flex; flex-direction: column; align-items: center; gap: 6px; font-family: var(--pix); font-size: 11px; color: var(--ink-3); width: 48px; }
.route .st i { width: 14px; height: 14px; border: 2px solid var(--ink); background: var(--card); }
.route .st.on { color: var(--orange); }
.route .st.on i { background: var(--orange); border-color: var(--orange); animation: blink 1s steps(1) infinite; }
.route .ln { flex: 1 0 10px; height: 2px; background: var(--ink); margin-top: 6px; transform-origin: left; transform: scaleX(0); animation: draw .3s steps(6) forwards; }
@keyframes draw { to { transform: scaleX(1); } }
.kicker { font-family: var(--pix); font-size: 22px; color: var(--orange); line-height: 1.2; }
.hero h1 { font-family: var(--nb); font-weight: 900; font-size: clamp(40px, 5.4vw, 60px); line-height: 1.12; margin: 6px 0 16px; letter-spacing: .01em; }
.hero h1 .cursor::after { content: "▌"; color: var(--orange); animation: blink .7s steps(1) infinite; font-size: .8em; }
.hero .axis { font-size: 18px; color: var(--ink-2); margin: 0; }

/* 我的夥伴 */
.buddy .bd { padding: 0 !important; }
.buddy canvas { display: block; width: 100%; height: 230px; background: var(--orange); border-bottom: 3px solid var(--ink); }
.buddy .say { padding: 12px 14px 22px; font-size: 14px; line-height: 1.7; }
.buddy .say b { font-weight: 800; }
.buddy .acts { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.restore { display: grid; gap: 6px; margin-top: 8px; }
.restore input { font: inherit; font-size: 14px; padding: 6px 8px; border: 2px solid var(--ink); background: #FFF9EC; border-radius: 0; width: 100%; }
.restore .msg { font-size: 12px; color: var(--orange); min-height: 1.2em; }

.btn { font-family: var(--pix); font-size: 12px; letter-spacing: .05em; cursor: pointer; background: var(--card); color: var(--ink); border: 2px solid var(--ink); padding: 5px 10px; box-shadow: 2px 2px 0 var(--ink); transition: transform .08s, box-shadow .08s, background .15s; }
.btn:hover { background: var(--cream); }
.btn:active { transform: translate(2px, 2px); box-shadow: none; }
.btn.o { background: var(--orange); color: var(--card); }

/* ── 頁（投影頁） ── */
section.pg { padding: 72px 0 4px; }
.pno { display: inline-flex; align-items: center; gap: 10px; font-family: var(--pix); font-size: 13px; }
.pno b { font-weight: normal; background: var(--ink); color: var(--cream); padding: 2px 7px; }
.pno span { color: var(--orange); }
.pg h2 { font-family: var(--nb); font-weight: 900; font-size: clamp(28px, 4.4vw, 38px); line-height: 1.3; margin: 12px 0 18px; letter-spacing: .01em; }
.pg h2 .b { display: block; }
.pg h3 { font-family: var(--nb); font-weight: 900; font-size: 21px; margin: 36px 0 12px; }
.lead { font-size: 18px; color: var(--ink-2); margin: 0 0 18px; }
ul.pts { list-style: none; margin: 0; padding: 0; }
ul.pts li { position: relative; padding: 8px 0 8px 28px; }
ul.pts li::before { content: ""; position: absolute; left: 4px; top: 19px; width: 9px; height: 9px; background: var(--orange); }
ul.pts li b { font-weight: 800; }
.note { margin: 16px 0 0; font-size: 15px; color: var(--ink-2); padding-left: 14px; border-left: 4px solid var(--ink); }

.cards { display: grid; gap: 14px; margin: 6px 0 12px; }
.cards.c3 { grid-template-columns: repeat(3, 1fr); }
.cards .dlg > .bd { padding: 12px 14px 18px; }
.cards .t { font-weight: 800; font-size: 17px; line-height: 1.55; }
.cards .d { font-size: 13px; color: var(--ink-3); margin-top: 6px; font-family: var(--pix); }

/* P2 時間軸 */
.reel .bd { padding: 34px 22px 14px !important; }
.reel .track { position: relative; height: 3px; background: rgba(22,18,15,.18); }
.reel .fill { position: absolute; left: 0; top: 0; height: 3px; width: 0; background: var(--orange); transition: width 1.4s steps(14); }
.reel .dot { position: absolute; top: -8px; width: 18px; height: 18px; margin-left: -9px; background: var(--card); border: 3px solid var(--ink); }
.reel .dot.lit { background: var(--orange); border-color: var(--ink); }
.reel .dot b { position: absolute; top: -26px; left: 50%; transform: translateX(-50%); font-family: var(--pix); font-weight: normal; font-size: 11px; color: var(--ink-3); }
.reel .ends { display: flex; justify-content: space-between; font-family: var(--pix); font-size: 12px; color: var(--ink-3); margin-top: 12px; }

/* 練習卡（同公開畫面 .c-practice） */
.practice .bd { font-size: 18px; line-height: 1.75; }
.practice .big { font-family: var(--pix); font-size: 54px; line-height: 1; color: var(--orange); float: right; margin: 0 0 8px 16px; }

/* 你的回答 */
.mine { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 0 16px; align-items: end; margin: 28px 0 0; }
.mine .av { width: 120px; height: 120px; background: var(--orange); border: 3px solid var(--ink); box-shadow: 4px 4px 0 var(--ink); image-rendering: pixelated; display: block; }
.mine .dlg { margin-bottom: 4px; }
.mine .dlg::before { content: ""; position: absolute; left: -15px; bottom: 22px; border: 8px solid transparent; border-right: 10px solid var(--ink); }
.mine .txt { white-space: pre-wrap; word-break: break-word; font-size: 17px; }
.mine .txt.none { color: var(--ink-3); font-size: 15px; }
.mine .pic { display: block; max-width: 100%; max-height: 320px; margin-top: 10px; border: 2px solid var(--ink); }

/* 全班的回答（同作答牆 .db） */
.wallhd { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin: 36px 0 12px; }
.wallhd h3 { margin: 0; }
.wallhd .pix { font-size: 13px; color: var(--ink-3); }
.wallhd .pix b { color: var(--orange); font-weight: normal; }
.wall { columns: 2 220px; column-gap: 16px; }
.db { break-inside: avoid; margin: 0 0 16px; background: var(--card); border: 2px solid var(--ink); box-shadow: 3px 3px 0 var(--ink); transform: rotate(var(--r)); cursor: pointer; transition: box-shadow .12s, transform .12s; display: block; width: 100%; text-align: left; padding: 0; font: inherit; color: inherit; }
.db:hover { box-shadow: 5px 5px 0 var(--ink); transform: rotate(0deg) translate(-1px, -1px); }
.db .h { display: flex; justify-content: space-between; gap: 8px; background: var(--ink); color: var(--cream); font-family: var(--pix); font-size: 12px; padding: 3px 8px; line-height: 1.5; }
.db .h span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.db .h span:last-child { color: var(--orange); flex: none; }
.db .b { padding: 8px 10px 10px; font-size: 14px; line-height: 1.65; white-space: pre-wrap; word-break: break-word; max-height: 11.5em; overflow: hidden; position: relative; }
.db .b.cut::after { content: "▼"; position: absolute; right: 8px; bottom: 2px; font-size: 11px; color: var(--orange); background: var(--card); padding-left: 4px; }
.db .b img { display: block; width: 100%; max-height: 160px; object-fit: cover; margin-bottom: 6px; border: 1px solid var(--ink); }
.db.self { border-color: var(--orange); box-shadow: 3px 3px 0 var(--orange); }
.db.self .h { background: var(--orange); }
.db.self .h span:last-child { color: var(--ink); }
.wall .db { opacity: 0; }
.wall.in .db { animation: pop .45s steps(5) forwards; }
.more { display: block; margin: 4px auto 0; }

/* 放大檢視（同 #wallBig） */
#big { position: fixed; inset: 0; z-index: 80; display: none; place-items: center; padding: 20px; background: rgba(239,227,200,.92);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px); background-size: 28px 28px; }
#big.on { display: grid; }
#big .dlg { width: min(720px, 100%); max-height: 86vh; display: flex; flex-direction: column; animation: pop .35s steps(5); box-shadow: 10px 10px 0 var(--ink); }
#big .bd { overflow: auto; white-space: pre-wrap; word-break: break-word; font-size: 19px; line-height: 1.8; }
#big .bd img { display: block; max-width: 100%; max-height: 60vh; margin: 0 auto 12px; border: 2px solid var(--ink); }
#big .nav { display: flex; justify-content: space-between; gap: 8px; padding: 0 18px 16px; }

/* 課後重寫 */
details.redo { margin-top: 24px; }
details.redo > summary { list-style: none; cursor: pointer; font-family: var(--pix); font-size: 13px; color: var(--ink-2); display: inline-flex; gap: 8px; align-items: center; }
details.redo > summary::-webkit-details-marker { display: none; }
details.redo > summary::before { content: "▶"; color: var(--orange); font-size: 11px; transition: transform .15s; }
details.redo[open] > summary::before { transform: rotate(90deg); }
.form { margin-top: 12px; }
.form .row { display: grid; grid-template-columns: 30px 1fr 1fr; gap: 8px; align-items: center; margin-bottom: 8px; }
.form .k { font-family: var(--pix); font-size: 13px; color: var(--orange); }
.form input, .form textarea { width: 100%; font: inherit; font-size: 15px; line-height: 1.5; padding: 7px 9px; border: 2px solid var(--ink); background: #FFF9EC; border-radius: 0; outline: none; }
.form input:focus, .form textarea:focus { border-color: var(--orange); }
.form .tools { display: flex; gap: 8px; align-items: center; margin-top: 10px; flex-wrap: wrap; }
.form .saved { margin-left: auto; font-size: 12px; color: var(--ink-3); }

/* P5 矩陣 */
.mx { width: 100%; border-collapse: collapse; font-size: 14px; }
.mx th, .mx td { padding: 8px 10px; border-bottom: 1px dashed rgba(22,18,15,.25); text-align: left; }
.mx th { font-family: var(--pix); font-weight: normal; font-size: 11px; color: var(--ink-3); }
.mx .c { text-align: center; width: 62px; }
.mx td.m.empty { color: var(--ink-3); }
.chk { appearance: none; -webkit-appearance: none; width: 20px; height: 20px; margin: 0; border: 2px solid var(--ink); background: #FFF9EC; cursor: pointer; vertical-align: middle; }
.chk:checked { background: var(--orange); box-shadow: inset 0 0 0 3px #FFF9EC; }
.mx td.sum { font-family: var(--pix); text-align: center; color: var(--ink-3); }
.mx td.sum.hi { color: var(--orange); }

/* P6 */
.same { display: grid; grid-template-columns: repeat(12, 1fr); gap: 6px; margin: 8px 0 22px; }
.same i { aspect-ratio: 1; display: block; background: var(--card); border: 2px solid var(--ink); }
.same.go i.me { background: var(--orange); animation: blink 1s steps(1) 3 1s; }
.quote { font-family: var(--nb); font-weight: 900; font-size: 28px; line-height: 1.5; margin: 0 0 6px; }
.quote + .pix { color: var(--ink-3); font-size: 13px; }

/* 四圈 */
.circ .bd { display: grid; grid-template-columns: 240px 1fr; gap: 24px; align-items: center; }
.circ svg { width: 100%; height: auto; display: block; }
.circ .c { cursor: pointer; fill: transparent; stroke: var(--ink); stroke-width: 3; }
.circ .c.on { fill: rgba(230,75,19,.3); }
.circ .lb { font-family: var(--pix); font-size: 13px; fill: var(--ink); pointer-events: none; }
.circ .tg { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-top: 12px; }
.circ .tg .btn { font-family: var(--sans); font-size: 13px; font-weight: 700; letter-spacing: 0; }
.circ .tg .btn.on { background: var(--orange); color: var(--card); }
.res .k { font-family: var(--pix); font-size: 12px; color: var(--ink-3); }
.res .v { font-family: var(--nb); font-weight: 900; font-size: 32px; line-height: 1.3; margin: 4px 0 8px; }
.res .v.pop { animation: pop .35s steps(5); }
.res .d { font-size: 15px; color: var(--ink-2); line-height: 1.75; }
.res .miss { display: inline-block; margin-top: 10px; font-size: 13px; background: var(--ink); color: var(--cream); padding: 2px 8px; }
.res .miss:empty { display: none; }
table.t { width: 100%; border-collapse: collapse; font-size: 15px; }
table.t th { font-family: var(--pix); font-weight: normal; font-size: 11px; color: var(--ink-3); text-align: left; padding: 4px 8px 6px; border-bottom: 2px solid var(--ink); }
table.t td { padding: 9px 8px; border-bottom: 1px dashed rgba(22,18,15,.25); vertical-align: top; }
table.t tr:last-child td { border-bottom: 0; }
table.t td.o { color: var(--orange); font-weight: 800; white-space: nowrap; }

/* 一句話 */
.formula { font-family: var(--nb); font-weight: 900; font-size: 28px; line-height: 1.9; margin: 4px 0 16px; }
.formula .slot { display: inline-block; min-width: 3em; text-align: center; color: var(--orange); border-bottom: 4px solid var(--orange); line-height: 1.3; padding: 0 4px; }
.map { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 14px; }
.map div { font-size: 14px; color: var(--ink-2); line-height: 1.6; border-top: 3px solid var(--ink); padding-top: 6px; }
.map b { display: block; font-family: var(--pix); font-weight: normal; font-size: 12px; color: var(--orange); }
.alt { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.alt .t { font-size: 16px; }
.build { display: grid; grid-template-columns: auto 1fr; gap: 8px 10px; align-items: center; }
.build span { font-weight: 800; }
.out { margin-top: 14px; padding: 12px 14px; background: var(--ink); color: var(--cream); font-family: var(--nb); font-weight: 900; font-size: 20px; line-height: 1.6; min-height: 3.2em; }
.out .ph { color: #8B7E6C; }

/* MVP */
.loop { display: block; width: 100%; max-width: 540px; margin: 0 auto; }
.loop .box { fill: var(--card); stroke: var(--ink); stroke-width: 3; }
.loop .sh { fill: var(--ink); }
.loop text { font-family: var(--pix); font-size: 15px; fill: var(--ink); text-anchor: middle; }
.loop text.zh { font-family: var(--sans); font-size: 13px; font-weight: 700; fill: var(--ink-2); }
.loop path.ln { fill: none; stroke: var(--ink); stroke-width: 3; stroke-dasharray: 6 6; }
.loop path.back { stroke: var(--orange); }
.loop.go path.ln { animation: march 1s steps(4) infinite; }
@keyframes march { to { stroke-dashoffset: -12; } }

/* 老陳講解 */
.talk { display: grid; grid-template-columns: 76px minmax(0, 1fr); gap: 0 14px; align-items: start; margin: 32px 0 6px; }
.talk .av { width: 76px; height: 76px; background: var(--card); border: 3px solid var(--ink); box-shadow: 3px 3px 0 var(--orange); image-rendering: pixelated; display: block; }
.talk .dlg { border-style: dashed; box-shadow: none; }
.talk .dlg > .hd { background: transparent; color: var(--ink); border-bottom: 2px dashed var(--ink); }
.talk .todo { color: var(--orange); }

/* 延伸閱讀 */
details.src { margin-top: 16px; }
details.src > summary { list-style: none; cursor: pointer; font-family: var(--pix); font-size: 12px; color: var(--ink-3); display: inline-flex; gap: 8px; align-items: center; padding: 4px 0; }
details.src > summary::-webkit-details-marker { display: none; }
details.src > summary::before { content: "+"; display: grid; place-items: center; width: 18px; height: 18px; border: 2px solid var(--ink-3); font-size: 12px; }
details.src[open] > summary::before { content: "−"; }
details.src > summary:hover { color: var(--ink); }
details.src .in { font-size: 14px; line-height: 1.8; color: var(--ink-2); margin-top: 10px; padding: 12px 16px; background: rgba(246,238,219,.75); border-left: 3px solid var(--ink-3); }
details.src .in ul { margin: 0; padding-left: 18px; }
details.src .in a { word-break: break-all; }

.next { margin-top: 90px; }
.next a { text-decoration: none; color: var(--ink); display: block; }
.next b { font-family: var(--nb); font-weight: 900; font-size: 22px; }

/* 進場（逐格感：steps） */
.rv { opacity: 0; transform: translateY(14px); transition: opacity .5s steps(5), transform .5s steps(5); }
.rv.in { opacity: 1; transform: none; }
.stag > * { opacity: 0; transform: translateY(10px); transition: opacity .4s steps(4), transform .4s steps(4); }
.stag.in > * { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .rv, .stag > *, .wall .db { opacity: 1 !important; transform: none !important; transition: none !important; animation: none !important; }
  * { animation: none !important; }
  .route .ln { transform: none; }
  html { scroll-behavior: auto; }
}

@media (max-width: 880px) {
  .wrap { grid-template-columns: 1fr; gap: 0; padding: 0 16px; }
  nav.toc { position: sticky; top: 0; z-index: 50; height: auto; padding: 8px 0; margin: 0 -16px; background: var(--cream); border-bottom: 3px solid var(--ink); }
  .toc > .dlg { border: 0; box-shadow: none; background: transparent; }
  .toc > .dlg > .hd, .toc .me { display: none; }
  .toc ol { display: flex; gap: 6px; overflow-x: auto; padding: 0 16px; scrollbar-width: none; }
  .toc ol::-webkit-scrollbar { display: none; }
  .toc a { display: block; white-space: nowrap; border: 2px solid var(--ink); padding: 3px 10px; font-size: 13px; background: var(--card); }
  .toc a span, .toc .hw { display: none; }
  main { padding-top: 18px; }
  .hero { grid-template-columns: 1fr; }
  .buddy canvas { height: 200px; }
  .cards.c3, .map, .alt { grid-template-columns: 1fr; }
  .circ .bd { grid-template-columns: 1fr; }
  .circ svg { max-width: 240px; margin: 0 auto; }
  .mine { grid-template-columns: 72px minmax(0, 1fr); gap: 0 12px; }
  .mine .av { width: 72px; height: 72px; }
  .talk { grid-template-columns: 52px minmax(0, 1fr); gap: 0 10px; }
  .talk .av { width: 52px; height: 52px; }
  .form .row { grid-template-columns: 26px 1fr; }
  .form .row input:last-child { grid-column: 2; }
  .wall { columns: 1; }
  .same { grid-template-columns: repeat(8, 1fr); }
  .same i:nth-child(n+17) { display: none; }
  .practice .big { font-size: 40px; }
}
@media print {
  body::after, #bar, nav.toc, .talk, .buddy, .form .tools, .more { display: none !important; }
  .wrap { display: block; }
  .rv, .stag > *, .wall .db { opacity: 1 !important; transform: none !important; animation: none !important; }
  .db .b { max-height: none; }
}

/* ── 建置版補充（tools/handout_build.py） ── */
.o { color: var(--orange); font-weight: 800; }
.talk .bd p { margin: 0 0 8px; }
.talk .bd p:last-child { margin-bottom: 0; }
.pg > p.rv { margin: 0 0 14px; }
ol.idx { list-style: none; margin: 0; padding: 4px 0; }
ol.idx a { display: grid; grid-template-columns: 56px 1fr; gap: 8px; padding: 12px 16px; color: var(--ink); text-decoration: none; font-size: 18px; border-bottom: 1px dashed rgba(22,18,15,.2); transition: background .15s; }
ol.idx li:last-child a { border-bottom: 0; }
ol.idx a:hover { background: var(--ink); color: var(--cream); }
ol.idx a span { font-family: var(--pix); color: var(--orange); font-size: 14px; padding-top: 3px; }
ol.idx a em { font-style: normal; font-weight: 800; }

/* ── CH02 元件 ── */
.cards.c2 { grid-template-columns: repeat(2, 1fr); }
.cards.cg { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
.cards.cg .t { font-size: 15px; }
.cards .dlg.or .t { color: var(--ink); }
/* 亂寫 → 刪掉 → 圈出 */
.scribble { display: flex; flex-wrap: wrap; gap: 10px 22px; padding: 6px 2px 4px; font-family: var(--nb); font-weight: 900; font-size: 22px; line-height: 1.4; }
.scribble .w { position: relative; transform: rotate(calc((var(--i) * 37 % 7 - 3) * 1deg)); opacity: 0; }
.scrib.in .w { animation: wIn .3s steps(3) forwards; animation-delay: calc(var(--i) * 120ms); }
@keyframes wIn { to { opacity: 1; } }
.scribble .w:not(.keep)::after { content: ""; position: absolute; left: -4px; right: -4px; top: 52%; height: 4px; background: var(--orange); transform: scaleX(0); transform-origin: left; }
.scrib.in .w:not(.keep)::after { animation: strike .4s steps(4) forwards; animation-delay: calc(1.6s + var(--i) * 140ms); }
.scrib.in .w:not(.keep) { animation: wIn .3s steps(3) forwards, fade .4s steps(4) forwards; animation-delay: calc(var(--i) * 120ms), calc(2.1s + var(--i) * 140ms); }
@keyframes strike { to { transform: scaleX(1); } }
@keyframes fade { to { opacity: .35; } }
.scribble .w.keep::before { content: ""; position: absolute; inset: -6px -10px; border: 3px solid var(--orange); border-radius: 50%; opacity: 0; }
.scrib.in .w.keep::before { animation: wIn .3s steps(3) forwards; animation-delay: 3.4s; }
.scrib.in .w.keep { animation: wIn .3s steps(3) forwards, big .4s steps(4) forwards; animation-delay: calc(var(--i) * 120ms), 3.4s; }
@keyframes big { to { transform: scale(1.15); color: var(--orange); } }
/* 冰山 */
.ice { display: grid; grid-template-columns: 220px 1fr; gap: 20px; align-items: stretch; }
.berg { width: 100%; height: auto; display: block; }
.berg .sea { fill: rgba(22,18,15,.08); }
.berg .tip { fill: var(--card); stroke: var(--ink); stroke-width: 3; }
.berg .under { fill: var(--orange); stroke: var(--ink); stroke-width: 3; opacity: .85; }
.berg .wl { stroke: var(--ink); stroke-width: 2; stroke-dasharray: 6 4; }
.ice-t { display: grid; grid-template-rows: 1fr 2.6fr; gap: 10px; }
.ice-t .bl { border-left: 4px solid var(--ink); padding: 4px 0 4px 12px; font-size: 15px; line-height: 1.7; align-self: start; }
.ice-t .bl.bot { border-color: var(--orange); align-self: center; }
.ice-t .bl b { display: block; font-family: var(--pix); font-weight: normal; font-size: 28px; color: var(--ink); line-height: 1.1; }
.ice-t .bl.bot b { color: var(--orange); }
/* 5 Why */
ol.whys { list-style: none; margin: 0 0 14px; padding: 0; }
ol.whys li { display: grid; grid-template-columns: 80px 1fr; gap: 10px; padding: 9px 0; border-bottom: 1px dashed rgba(22,18,15,.25); opacity: .14; transition: opacity .3s steps(3); }
ol.whys li.on { opacity: 1; animation: pop .35s steps(5); }
ol.whys li b { font-family: var(--pix); font-weight: normal; font-size: 13px; color: var(--orange); padding-top: 3px; }
ol.whys li:last-child.on span { font-weight: 800; }
/* 流程 */
.flow { display: flex; align-items: stretch; gap: 8px; margin: 6px 0 14px; flex-wrap: wrap; }
.flow .fb { flex: 1 1 120px; border: 3px solid var(--ink); background: var(--card); box-shadow: 4px 4px 0 var(--ink); padding: 10px 12px; }
.flow .fb b { display: block; font-family: var(--nb); font-weight: 900; font-size: 18px; line-height: 1.4; }
.flow .fb span { display: block; font-family: var(--pix); font-size: 12px; color: var(--ink-3); margin-top: 4px; }
.flow .fb.hot { background: var(--orange); color: var(--card); }
.flow .fb.hot span { color: var(--card); }
.flow .fa { align-self: center; font-family: var(--pix); font-size: 22px; color: var(--orange); }
/* 大數字 */
.stat { display: flex; align-items: center; gap: 18px; margin: 10px 0 16px; }
.stat .n { font-family: var(--pix); font-size: 72px; line-height: 1; color: var(--orange); flex: none; }
.stat .c { font-size: 16px; color: var(--ink-2); }
/* 影片 */
.vid { display: block; width: 100%; max-height: 70vh; background: var(--ink); }
/* 自由書寫 */
.fw .fwbar { height: 6px; background: rgba(22,18,15,.12); margin-bottom: 10px; }
.fw .fwbar i { display: block; height: 100%; width: 0; background: var(--orange); transition: width 1s steps(1); }
.fw textarea { width: 100%; font: inherit; font-size: 16px; line-height: 1.8; padding: 10px 12px; border: 2px solid var(--ink); background: #FFF9EC; border-radius: 0; outline: none; resize: vertical; }
.fw textarea:focus { border-color: var(--orange); }
.fw .fwt { font-size: 16px; }
.fw.end .fwt { animation: blink .8s steps(1) infinite; }
.fw .tools, .form.open .tools { display: flex; gap: 8px; align-items: center; margin-top: 10px; flex-wrap: wrap; }
.fw .saved { margin-left: auto; font-size: 12px; color: var(--ink-3); }
/* 欄位表單、AI 指令 */
.form .fld { display: grid; grid-template-columns: 170px 1fr; gap: 10px; align-items: center; margin-bottom: 8px; font-size: 14px; }
.form .fld span { font-weight: 700; }
.form.open { margin: 8px 0 14px; padding: 16px 18px; background: var(--card); border: 3px solid var(--ink); box-shadow: 6px 6px 0 var(--ink); }
.form.open .build span { font-family: var(--pix); font-weight: normal; font-size: 13px; color: var(--orange); }
.out.prompt { font-family: var(--sans); font-weight: 700; font-size: 17px; }
/* 心智圖 */
.mind { width: 100%; height: auto; display: block; }
.mind .mb { stroke: var(--ink); stroke-width: 3; }
.mind .ml { stroke: var(--ink-3); stroke-width: 1.5; }
.mind .mk { fill: none; stroke: var(--orange); stroke-width: 2.5; stroke-dasharray: 6 5; }
.mind .mn { fill: var(--card); stroke: var(--ink); stroke-width: 2.5; }
.mind .mc { fill: var(--orange); stroke: var(--ink); stroke-width: 3; }
.mind text { text-anchor: middle; font-family: var(--sans); }
.mind .mt { font-size: 15px; font-weight: 800; fill: var(--ink); }
.mind .mtc { font-size: 17px; font-weight: 900; fill: var(--card); }
.mind .mt2 { font-size: 12px; fill: var(--ink-2); }
@media (max-width: 880px) {
  .ice { grid-template-columns: 1fr; }
  .berg { max-width: 220px; margin: 0 auto; }
  .ice-t { grid-template-rows: auto; }
  .cards.c2 { grid-template-columns: 1fr; }
  .form .fld { grid-template-columns: 1fr; gap: 2px; }
  .stat .n { font-size: 52px; }
  .flow .fa { transform: rotate(90deg); margin: 0 auto; }
  .flow .fb { flex-basis: 100%; }
}
@media (prefers-reduced-motion: reduce) { .scribble .w { opacity: 1; } ol.whys li { opacity: 1; } }
ol.whys li:not(.on) span { visibility: hidden; }
.mind .md { fill: var(--ink-3); }
.mind .mt2 { font-size: 13px; }

/* ── 時間軸條、投票 ── */
.tracks { display: grid; gap: 10px; }
.tracks .tr { display: grid; grid-template-columns: 92px 1fr; gap: 10px; align-items: center; }
.tracks .tr b { font-family: var(--pix); font-weight: normal; font-size: 12px; color: var(--ink-2); }
.tracks .segs { display: flex; gap: 3px; height: 34px; }
.tracks .segs i { flex-basis: 0; min-width: 0; display: grid; place-items: center; font-style: normal; font-family: var(--pix); font-size: 11px; white-space: nowrap; overflow: hidden;
  background: var(--card); border: 2px solid var(--ink); transition: flex-grow .6s steps(6), opacity .4s steps(4), border-width .6s steps(6), background .3s; }
.tracks .segs i.hot, .tracks .segs i.acc { background: var(--orange); color: var(--card); }
.tracks .segs i.acc { border-width: 3px; }
.tracks .segs i.mute { background: rgba(22,18,15,.08); color: var(--ink-3); border-style: dashed; }
.tracks .segs i.room { background: transparent; border: 2px dashed var(--orange); color: var(--orange); }
.tracks .segs i.del { background: var(--ink); color: var(--cream); background-image: repeating-conic-gradient(var(--ink) 0 25%, #4a4038 0 50%); background-size: 4px 4px; }
.trk.cutdone .docut .segs i.del { flex-grow: 0 !important; opacity: 0; border-width: 0; padding: 0; }
.trk.cutdone .docut .segs i.keep { background: var(--orange); color: var(--card); }
.poll .pq { font-family: var(--nb); font-weight: 900; font-size: 20px; margin-bottom: 10px; }
.poll .pb { display: grid; gap: 8px; }
.poll .pb > div { position: relative; height: 32px; border: 2px solid var(--ink); background: var(--card); }
.poll .pb i { position: absolute; left: 0; top: 0; bottom: 0; width: 0; background: var(--orange); transition: width 1s steps(10); }
.poll .pb .x i { background: var(--ink); }
.poll .pb span { position: relative; z-index: 1; font-family: var(--pix); font-size: 13px; line-height: 28px; padding-left: 10px; color: var(--ink); text-shadow: 0 0 3px var(--cream), 0 0 3px var(--cream), 0 0 2px var(--cream); }
.poll:not(.in) .pb i { width: 0 !important; }
.poll .pm { font-family: var(--pix); font-size: 13px; color: var(--orange); margin-top: 8px; min-height: 1em; }
@media (max-width: 880px) { .tracks .tr { grid-template-columns: 1fr; gap: 4px; } }
.dlg.mute { opacity: .55; box-shadow: 3px 3px 0 var(--ink); }
.sim .simd { margin: 0 0 12px; font-size: 15px; color: var(--ink-2); }
.sim .simb { display: inline-block; text-decoration: none; font-size: 14px; padding: 8px 14px; }
.imgs { display: grid; gap: 14px; margin: 8px 0 16px; }
.imgs.n2 { grid-template-columns: 1fr 1fr; }
.imgs figure, .vids figure { margin: 0; border: 3px solid var(--ink); background: var(--card); box-shadow: 5px 5px 0 var(--ink); }
.imgs img, .vids video { display: block; width: 100%; height: auto; background: var(--ink); }
.imgs figcaption, .vids figcaption { font-family: var(--pix); font-size: 12px; padding: 6px 10px; border-top: 3px solid var(--ink); }
.vids { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; margin: 8px 0 16px; }
.vids video { aspect-ratio: 16 / 9; object-fit: cover; }
@media (max-width: 880px) { .imgs.n2 { grid-template-columns: 1fr; } .vids { grid-template-columns: 1fr 1fr; } }
.flow .fb.mute { opacity: .5; box-shadow: 2px 2px 0 var(--ink); }
.calc .fld { display: grid; grid-template-columns: 190px 1fr; gap: 10px; align-items: center; margin-bottom: 8px; font-size: 14px; font-weight: 700; }
.calc input { font: inherit; font-size: 16px; padding: 7px 9px; border: 2px solid var(--ink); background: #FFF9EC; border-radius: 0; width: 100%; }
.calc input:focus { outline: none; border-color: var(--orange); }
.calc .cres { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin: 6px 0 16px; padding: 10px 12px; background: var(--ink); color: var(--cream); }
.calc .cres .pix { font-size: 12px; color: var(--orange); }
.calc .cres b { font-family: var(--pix); font-weight: normal; font-size: 28px; }
.calc .verdict { font-size: 14px; }
@media (max-width: 880px) { .calc .fld { grid-template-columns: 1fr; gap: 2px; } }

/* ── 課堂錄影、Q&A ── */
.lecture .bd { padding: 0 !important; }
.lecture .lv { position: relative; background: var(--ink); }
.lecture video { display: block; width: 100%; aspect-ratio: 16 / 9; background: var(--ink); }
.lecture .lsub { position: absolute; left: 6%; right: 6%; bottom: 52px; text-align: center; color: #fff; font-size: clamp(14px, 2.4vw, 20px); line-height: 1.45; font-weight: 700; text-shadow: 0 0 4px #000, 0 0 2px #000, 0 1px 0 #000; pointer-events: none; }
.lecture .lsub .nt { display: inline-block; margin-top: 4px; font-size: .8em; font-weight: 700; color: var(--ink); background: var(--orange-soft); padding: 1px 8px; text-shadow: none; }
.lecture .ltools { display: flex; gap: 10px; align-items: center; padding: 10px 14px 0; }
.lecture .lcc.on { background: var(--orange); color: var(--card); }
.lecture .lp, .lecture .lt { font-family: var(--pix); font-size: 12px; }
.lecture .lp { color: var(--ink-3); }
.lecture .lcap { font-size: 13px; color: var(--ink-3); margin: 8px 14px 4px; }
.lecture .lmarks { list-style: none; margin: 0; padding: 4px 6px 12px; max-height: 260px; overflow: auto; }
.lecture .lmarks li { display: grid; grid-template-columns: 64px 1fr; gap: 8px; padding: 6px 8px; font-size: 14px; cursor: pointer; border-bottom: 1px dashed rgba(22,18,15,.18); }
.lecture .lmarks li span { font-family: var(--pix); font-size: 12px; color: var(--orange); padding-top: 2px; }
.lecture .lmarks li:hover { background: rgba(22,18,15,.06); }
.lecture .lmarks li.on { background: var(--ink); color: var(--cream); }
.btn.jump { margin-top: 10px; }
.qas { display: grid; gap: 16px; }
.qa .q { font-family: var(--nb); font-weight: 900; font-size: 18px; line-height: 1.5; margin-bottom: 6px; }
.qa ul.pts li { font-size: 15px; padding: 4px 0 4px 24px; }
.qa ul.pts li::before { top: 14px; }
.pg a { overflow-wrap: anywhere; }
.talk .clip { margin: -16px -18px 14px; background: var(--ink); }
.talk .clip video { display: block; width: 100%; aspect-ratio: 16 / 9; background: var(--ink); }
.talk .clip video::cue { font-size: 16px; background: rgba(22,18,15,.75); }
.yt { position: relative; aspect-ratio: 16 / 9; background: var(--ink); }
.yt iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.ytl { display: block; padding: 8px 14px; font-family: var(--pix); font-size: 12px; text-decoration: none; }