/* 召喚 AI 助教｜簡報與講師備忘錄樣式
   視覺方向見 docs/visual-style-guide-20261014.md：米白底、深藍主色、少量朱橘標示閱讀起點。 */
:root{color-scheme:light;
  --bg:#FAF7F2;--paper:#FFFFFF;--ink:#17202B;--muted:#5B6573;
  --blue:#1D3A6E;--blue-2:#2E5597;--blue-soft:#E7ECF4;
  --amber:#E0A43A;--amber-ink:#9A6A12;--amber-soft:#F6E7C6;
  --grey:#C9CED6;--grey-soft:#EEF1F5;--line:#E2DED6;--green:#2F7D5B;
  --radius:14px;--shadow:0 1px 2px rgba(23,32,43,.05),0 6px 18px rgba(23,32,43,.06)}
*{box-sizing:border-box}
body{margin:0;color:var(--ink);background:var(--bg);font-family:-apple-system,BlinkMacSystemFont,"PingFang TC","Noto Sans TC","Microsoft JhengHei",sans-serif;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--blue-2);text-underline-offset:.2em}
button,select{font:inherit;color:inherit;border:1px solid var(--grey);border-radius:8px;background:var(--paper);padding:.3em .7em}
button{cursor:pointer}button:hover{background:var(--blue-soft)}
button:focus-visible,a:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #7FA2DA;outline-offset:3px}
mark{background:var(--amber-soft);color:inherit;padding:0 .25em;border-radius:4px}

/* ---------- toolbar ---------- */
.toolbar{position:sticky;top:0;z-index:10;background:rgba(250,247,242,.92);backdrop-filter:blur(6px);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:.6rem;padding:.5rem 1rem;font-size:14px;flex-wrap:wrap}
.toolbar select{max-width:min(48vw,560px);height:38px;min-height:38px;line-height:normal;padding-top:0;padding-bottom:0;vertical-align:middle}
.toolbar button{height:38px;min-height:38px;line-height:1;vertical-align:middle}
.toolbar .home-button{width:38px;height:38px;flex:none;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--grey);border-radius:8px;background:var(--paper);color:var(--blue);text-decoration:none}
.toolbar .home-button:hover{background:var(--blue-soft)}
.toolbar .home-button svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
[id="1-P02"] table th:first-child,[id="1-P02"] table td:first-child{width:42%;min-width:240px}
[id="1-P02"] table td:first-child,[id="1-P02A"] table td:first-child{font-weight:750}
.toolbar .counter{margin-left:auto;font-variant-numeric:tabular-nums;color:var(--muted)}

/* ---------- slide frame ---------- */
.slide{max-width:1440px;min-height:calc(100vh - 58px);margin:auto;padding:clamp(28px,4vw,64px) clamp(28px,6vw,92px);display:flex;flex-direction:column;justify-content:center;position:relative}
.slide[hidden]{display:none}
.eyebrow{color:var(--blue);font-size:clamp(14px,1.3vw,19px);letter-spacing:.08em;margin:0 0 12px;display:flex;align-items:center;gap:12px}
.slide h1{font-size:clamp(30px,3.5vw,52px);line-height:1.28;letter-spacing:-.01em;margin:0 0 26px;font-weight:750}
.slide ul{padding:0;margin:0;list-style:none}
.slide li{font-size:clamp(20px,2.1vw,32px);line-height:1.55;margin:.35em 0;padding-left:1.15em;position:relative}
.slide li:before{content:"";position:absolute;left:0;top:.62em;width:.42em;height:.42em;border-radius:50%;background:var(--blue)}
[id="2-01"] .split-main li strong{color:var(--blue-2);font-weight:800}
[id="2-03"] table tbody td:first-child{color:var(--blue-2);font-weight:800}
.slide table{font-size:clamp(16px,1.55vw,24px);margin-top:20px}
.slide footer{font-size:13px;color:var(--muted);margin-top:24px;padding-top:10px;border-top:1px solid var(--line)}
.slide footer:empty{display:none}
.slide footer a{margin-right:1.2em;color:var(--muted)}
.level{display:inline-block;font-size:13px;padding:1px 10px;border:1px solid var(--blue);color:var(--blue);border-radius:99px;letter-spacing:0;font-weight:500}
.slide-lead{font-size:clamp(21px,2.2vw,32px);line-height:1.55;max-width:34em;margin:0 0 16px}
.slide-after{font-size:clamp(16px,1.55vw,22px);line-height:1.5;margin:16px 0 0;color:var(--muted)}

/* ---------- prompt ---------- */
.slide .prompt{font-size:16px;margin-top:20px}
.prompt summary{cursor:pointer;color:var(--blue-2);font-weight:600}
.prompt-copy-box{position:relative}
.prompt-copy-box .copy{position:absolute;top:22px;right:12px;z-index:1;display:grid;place-items:center;width:40px;height:40px;padding:0;color:var(--blue);box-shadow:var(--shadow);transition:opacity .16s ease,transform .16s ease,background-color .16s ease}
.prompt-copy-box .copy svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.prompt-copy-box .copy[data-copy-state="done"]{color:var(--green);border-color:var(--green);background:#eaf6ef}
.prompt-copy-box .copy[data-copy-state="error"]{color:#a34224;border-color:#a34224}
.prompt-copy-box .copy-label{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(hover:hover) and (pointer:fine){.prompt-copy-box .copy{opacity:0;transform:translateY(-3px);pointer-events:none}.prompt-copy-box:hover .copy,.prompt-copy-box:focus-within .copy{opacity:1;transform:none;pointer-events:auto}}
pre{white-space:pre-wrap;overflow-wrap:anywhere;font:inherit;line-height:1.7;background:var(--paper);border-left:4px solid var(--blue);border-radius:0 10px 10px 0;padding:18px 20px;margin:12px 0;box-shadow:var(--shadow)}
.prompt-copy-box pre{padding-right:68px}
.slide .prompt pre{max-height:40vh;overflow:auto}
.copy{font-size:14px}

/* ---------- tables ---------- */
table{width:100%;border-collapse:collapse}
th,td{text-align:left;vertical-align:top;padding:.55em .7em}
th{color:var(--blue);font-weight:650;border-bottom:2px solid var(--blue);background:transparent}
td{border-bottom:1px solid var(--line)}
tbody tr:nth-child(even) td{background:rgba(255,255,255,.55)}

/* ---------- legacy bar chart (lesson 4) ---------- */
figure{margin:22px 0 0}
figcaption{font-weight:650;font-size:20px;margin-bottom:12px}
.bar-row{display:grid;grid-template-columns:minmax(100px,1fr) 3fr 3em;align-items:center;gap:12px;margin:10px 0;font-size:19px}
.bar-track{background:var(--grey-soft);height:22px;border-radius:0 6px 6px 0}
.bar-fill{display:block;height:100%;background:var(--blue);border-radius:0 6px 6px 0}
.chart-note{font-size:14px;color:var(--muted)}

/* ---------- flow / group / branch / exchange diagrams ---------- */
.diagram{margin-top:20px}
.diagram figcaption{font-size:clamp(17px,1.6vw,22px);color:var(--blue)}
.diagram ol{display:flex;flex-wrap:wrap;gap:22px;list-style:none;padding:0;margin:0;counter-reset:step}
.diagram ol li{flex:1 1 170px;background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 18px 14px;position:relative;font-size:clamp(17px,1.55vw,22px);line-height:1.4;margin:0;counter-increment:step}
.diagram ol li:before{content:counter(step) ".";position:static;display:inline-block;width:auto;min-width:1.35em;height:auto;border-radius:0;background:none;color:var(--amber-ink);font-size:1.05em;font-weight:800;margin:0 .35em 0 0;top:auto;left:auto}
.diagram ol li:not(:last-child):after{content:'';position:absolute;right:-17px;top:50%;width:12px;height:12px;border-top:3px solid var(--amber);border-right:3px solid var(--amber);transform:translateY(-50%) rotate(45deg)}
.diagram ol li p,.diagram .diagram-node p,.diagram-root p{font-size:clamp(15px,1.3vw,19px);line-height:1.45;margin:6px 0 0;color:var(--muted)}
.diagram-group,.diagram-branches{display:flex;flex-wrap:wrap;gap:16px;list-style:none;padding:0!important;margin:0!important}
.diagram .diagram-node{flex:1 1 170px;min-width:0;padding:14px 16px;background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);margin:0;font-size:clamp(17px,1.55vw,22px);line-height:1.4}
.diagram .diagram-node:before{display:none}
.diagram-group{padding:16px!important;border:2px dashed var(--grey);border-radius:calc(var(--radius) + 4px)}
.diagram-root{width:max-content;max-width:100%;min-width:35%;margin:0 auto 28px;padding:12px 24px;background:var(--blue);color:#fff;border-radius:var(--radius);text-align:center;position:relative;font-size:clamp(17px,1.55vw,22px)}
.diagram-root p{color:#DCE4F2}
.diagram-root:after{content:'';position:absolute;width:3px;height:18px;background:var(--amber);left:50%;bottom:-21px}
.relation-label{display:block;font-size:12px;opacity:.8;margin-bottom:3px}
.diagram-branches{border-top:3px solid var(--amber);padding-top:18px!important}
.diagram-exchange{display:flex;align-items:stretch;gap:8px}
.diagram-exchange .diagram-node{flex:1 1 0}
.exchange-link{flex:0 0 78px;display:flex;flex-direction:column;justify-content:center;gap:6px;font-size:14px;color:var(--blue);text-align:center}
.exchange-link b{font-weight:400;font-size:20px;color:var(--amber-ink)}

/* ---------- exercise ---------- */
.exercise{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);border-top:5px solid var(--blue);margin-top:20px;padding:16px 22px}
.exercise h3{font-size:20px;margin:0 0 6px;color:var(--blue)}
.exercise p{font-size:clamp(17px,1.6vw,22px);line-height:1.5;margin:6px 0}
.exercise summary{font-size:16px;color:var(--amber-ink);cursor:pointer;font-weight:600}
.exercise details{margin-top:6px}
.exercise details p{max-height:30vh;overflow:auto;font-size:17px}
.exercise h4{margin:14px 0 0}

/* ---------- split layout (text + visual / chart) ---------- */
.split{display:grid;grid-template-columns:minmax(0,55fr) minmax(0,45fr);gap:clamp(20px,3vw,44px);align-items:center}
.split>*{min-width:0}
.split .split-main>:first-child{margin-top:0}
.split.wide-visual{grid-template-columns:minmax(0,45fr) minmax(0,55fr)}

/* ---------- visual holes (illustration / screenshot) ---------- */
.visual{margin:0}
.visual img{display:block;width:100%;height:auto;max-height:58vh;object-fit:contain;border-radius:var(--radius)}
.visual-hole{aspect-ratio:16/10;max-height:56vh;width:100%;border:2px dashed var(--grey);border-radius:var(--radius);background:repeating-linear-gradient(135deg,rgba(201,206,214,.16) 0 12px,transparent 12px 24px);display:flex;flex-direction:column;justify-content:center;align-items:center;gap:10px;padding:20px;text-align:center;color:var(--muted)}
.visual-hole svg{width:46px;height:46px;stroke:var(--blue);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;opacity:.75}
.visual-hole strong{font-size:clamp(15px,1.35vw,19px);color:var(--blue)}
.visual-hole span{font-size:clamp(13px,1.15vw,16px);line-height:1.45;max-width:26em}
.visual-shot .visual-hole{border-color:var(--amber);background:repeating-linear-gradient(135deg,rgba(224,164,58,.08) 0 12px,transparent 12px 24px)}
.visual-shot .visual-hole svg{stroke:var(--amber-ink)}
.visual-shot .visual-hole strong{color:var(--amber-ink)}
.visual figcaption{font-size:13px;font-weight:400;color:var(--muted);margin:8px 0 0}

/* ---------- hero (cover) ---------- */
.slide.hero{justify-content:center}
.hero-grid{display:grid;grid-template-columns:minmax(0,46fr) minmax(0,54fr);gap:clamp(24px,4vw,60px);align-items:center}
.slide.hero h1{font-size:clamp(40px,5.2vw,78px);margin-bottom:18px}
.slide.hero li{font-size:clamp(18px,1.8vw,26px);color:var(--muted)}
.slide.hero li:before{background:var(--amber)}
.slide.hero .visual-hole{aspect-ratio:4/3}

/* ---------- cards ---------- */
.cards{display:grid;grid-template-columns:repeat(var(--cols,3),minmax(0,1fr));gap:clamp(12px,1.6vw,22px);margin-top:8px}
.card{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);padding:clamp(14px,1.6vw,24px);position:relative;border-top:5px solid var(--blue);min-width:0}
.card .ico{width:clamp(30px,2.8vw,42px);height:clamp(30px,2.8vw,42px);stroke:var(--blue);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;margin-bottom:8px;display:block}
.card h3{font-size:clamp(18px,1.75vw,26px);line-height:1.3;margin:0 0 6px}
.card p{font-size:clamp(15px,1.4vw,20px);line-height:1.5;margin:0;color:var(--muted)}
.card .tag{position:absolute;top:12px;right:14px;font-size:12px;color:var(--muted);border:1px solid var(--grey);border-radius:99px;padding:0 9px}
.card.tone-amber{border-top-color:var(--amber)}
.card.tone-amber .ico{stroke:var(--amber-ink)}
.card.tone-muted{background:transparent;box-shadow:none;border:2px dashed var(--grey);border-top-width:2px}
.card.tone-muted .ico{stroke:var(--muted)}
.card.tone-muted h3{color:var(--muted)}
.cards.check .card{border-top:0;border-left:5px solid var(--green);display:grid;grid-template-columns:auto 1fr;gap:4px 14px;align-items:start}
.cards.check .card .ico{grid-row:span 2;stroke:var(--green);margin:2px 0 0}
.cards.check .card h3{margin:0}
.cards.timeline .card{border-top-width:0;border-left:5px solid var(--blue)}
.cards.timeline .card .num{display:inline-grid;place-items:center;width:1.9em;height:1.9em;border-radius:50%;background:var(--blue);color:#fff;font-weight:700;font-size:clamp(13px,1.15vw,16px);margin-bottom:6px}
.cards.timeline .card.tone-muted .num{background:var(--grey);color:var(--ink)}
.cards-group-label{font-size:clamp(14px,1.25vw,18px);font-weight:700;color:var(--blue);margin:14px 0 6px;letter-spacing:.06em}

/* ---------- compare ---------- */
.compare{display:grid;gap:clamp(12px,1.6vw,22px);margin-top:10px}
.compare-row{display:grid;grid-template-columns:minmax(0,1fr) 48px minmax(0,1.6fr);align-items:stretch;gap:0}
.compare-row .arrow{display:grid;place-items:center}
.compare-row .arrow:after{content:'';width:14px;height:14px;border-top:4px solid var(--amber);border-right:4px solid var(--amber);transform:rotate(45deg)}
.bubble{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);padding:clamp(12px,1.4vw,20px);font-size:clamp(16px,1.5vw,22px);line-height:1.5}
.bubble small{display:block;font-size:12px;letter-spacing:.06em;color:var(--muted);margin-bottom:4px}
.bubble.weak{background:var(--grey-soft);box-shadow:none;color:var(--muted)}
.bubble.strong{border:2px solid var(--blue)}
.compare-cols{display:grid;grid-template-columns:repeat(var(--cols,3),minmax(0,1fr));gap:clamp(12px,1.6vw,22px);margin-top:10px}
.compare-col{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column}
.compare-col .head{background:var(--blue-soft);padding:12px 16px;font-weight:650;font-size:clamp(15px,1.4vw,20px);color:var(--blue);display:flex;gap:10px;align-items:center}
.compare-col .head .ico{width:26px;height:26px;stroke:var(--blue);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}
.compare-col .body{padding:14px 16px;font-size:clamp(15px,1.4vw,20px);line-height:1.5;flex:1}
.compare-col.tone-amber{outline:3px solid var(--amber)}
.compare-col.tone-amber .head{background:var(--amber-soft);color:var(--amber-ink)}
.compare-col.tone-amber .head .ico{stroke:var(--amber-ink)}

/* ---------- annotate (sentence breakdown) ---------- */
.annotate{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);padding:clamp(16px,2vw,28px);font-size:clamp(19px,2vw,29px);line-height:2.15;margin-top:6px}
.annotate .seg{padding:.12em .3em;border-radius:6px;border-bottom:4px solid}
.annotate .seg sup{font-size:.48em;font-weight:700;margin-left:.3em;letter-spacing:.04em;vertical-align:.9em}
.annotate .k1{background:#E3EAF6;border-color:var(--blue)}.annotate .k1 sup{color:var(--blue)}
.annotate .k2{background:var(--amber-soft);border-color:var(--amber)}.annotate .k2 sup{color:var(--amber-ink)}
.annotate .k3{background:#E2F0EA;border-color:var(--green)}.annotate .k3 sup{color:var(--green)}
.annotate .k4{background:#ECE8F4;border-color:#6A5A9C}.annotate .k4 sup{color:#6A5A9C}
.annotate-note{font-size:clamp(15px,1.4vw,20px);color:var(--muted);margin-top:12px}

/* ---------- nest / stack / decision ---------- */
.nest{border:2.5px solid var(--blue);border-radius:calc(var(--radius) + 6px);padding:30px 22px 20px;position:relative;margin-top:22px;display:grid;grid-template-columns:repeat(var(--cols,2),minmax(0,1fr));gap:18px;align-items:start}
.nest>.nest-label{position:absolute;top:-.85em;left:22px;background:var(--bg);padding:0 10px;font-weight:700;color:var(--blue);font-size:clamp(16px,1.5vw,22px)}
.nest .box{background:var(--paper);border-radius:var(--radius);padding:16px 18px;border:2px solid var(--grey)}
.nest .box.dashed{border:2px dashed var(--amber)}
.nest .box h3{font-size:clamp(17px,1.6vw,23px);margin:0 0 8px}
.nest .box p{font-size:clamp(14px,1.3vw,18px);color:var(--muted);margin:8px 0 0}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips span{background:var(--blue);color:#fff;border-radius:8px;padding:4px 12px;font-size:clamp(14px,1.3vw,18px)}
.outside{display:flex;flex-wrap:wrap;gap:12px;margin-top:16px;align-items:center}
.outside .lbl{font-size:clamp(14px,1.3vw,18px);color:var(--amber-ink);font-weight:700}
.outside .chips span{background:var(--paper);color:var(--ink);border:2px dashed var(--amber)}
.stack{display:grid;gap:10px;margin-top:10px}
.stack .layer{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.5fr);gap:20px;align-items:center;background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);padding:12px 18px;border-left:8px solid var(--blue)}
.stack .layer:nth-child(2){border-left-color:var(--blue-2)}
.stack .layer:nth-child(3){border-left-color:#6F8BB8}
.stack .layer:nth-child(4){border-left-color:var(--amber)}
.stack .layer h3{font-size:clamp(17px,1.6vw,23px);margin:0}
.stack .layer h3 small{display:block;font-size:.7em;color:var(--muted);font-weight:500}
.stack .layer p{font-size:clamp(15px,1.35vw,19px);margin:0;color:var(--muted)}
.decision{display:grid;gap:12px;margin-top:10px}
.decision .step{display:grid;grid-template-columns:minmax(0,1.2fr) 70px minmax(0,1fr);align-items:center}
.decision .q{background:var(--paper);border:2px solid var(--blue);border-radius:var(--radius);padding:12px 16px;font-size:clamp(16px,1.5vw,21px);font-weight:600}
.decision .q small{display:block;font-weight:400;color:var(--muted);font-size:.78em}
.decision .no{text-align:center;color:var(--amber-ink);font-size:13px;font-weight:700}
.decision .no:after{content:'';display:block;height:3px;background:var(--amber);margin:4px 8px 0}
.decision .fix{background:var(--amber-soft);border-radius:var(--radius);padding:12px 16px;font-size:clamp(15px,1.4vw,19px)}
.decision .fix small{display:block;color:var(--amber-ink);font-weight:700;font-size:.75em}

/* ---------- ECharts ---------- */
.charts{display:grid;grid-template-columns:repeat(var(--cols,1),minmax(0,1fr));gap:clamp(14px,2vw,28px);margin-top:6px}
.echart-box{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px 16px 10px;min-width:0;position:relative}
.echart-box h3{font-size:clamp(15px,1.4vw,20px);margin:0;color:var(--ink)}
.echart{width:100%;height:var(--h,320px)}
.echart-box .chart-src{font-size:12px;color:var(--muted);margin:4px 0 0}
.echart-box.pending .echart{opacity:.35;filter:grayscale(1)}
.echart-box .pending-badge{position:absolute;top:12px;right:14px;font-size:12px;font-weight:700;color:var(--amber-ink);background:var(--amber-soft);border-radius:99px;padding:2px 10px}

/* ---------- documents (memo, outline, index) ---------- */
.document{max-width:1000px;margin:auto;padding:36px 28px 80px}
.document h1{font-size:36px;line-height:1.3}
.document h2{font-size:26px;line-height:1.4;margin-top:2em}
.document h3{font-size:20px}
.document p,.document li{font-size:18px}
.document article{border-top:1px solid var(--line);margin-top:42px;padding-top:10px;scroll-margin-top:76px}
.document .meta{color:var(--muted)}
.document .note-row{display:grid;grid-template-columns:90px 1fr;gap:12px;margin:14px 0}
.note-row strong{color:var(--blue)}
.note-row p{margin:0;white-space:pre-line}
.note-visual{background:var(--amber-soft);border-radius:10px;padding:10px 14px}
.note-visual strong{color:var(--amber-ink)}
.toc{columns:2;column-gap:3rem;padding-left:1.4em}
.toc li{break-inside:avoid;margin:.4em 0;font-size:16px}
.course-list{list-style:none;padding:0}
.course-list li{padding:24px 0;border-top:1px solid var(--line)}
.course-list h2{margin:0 0 8px}
.course-list a{margin-right:1.2em}
.overview{font-size:20px;color:var(--muted)}
.print-only{display:none}
.document ul{padding-left:1.3em}
.document .slide-lead{font-size:20px}
.document .slide-after{font-size:17px}
.document .split,.document .hero-grid{grid-template-columns:1fr;gap:16px;margin:16px 0}
.document .cards{--cols:2!important}
.document .card h3{font-size:18px}.document .card p{font-size:15px}
.document .visual-hole{aspect-ratio:auto;min-height:120px}
.document .compare-row{grid-template-columns:1fr 36px 1.4fr}
.document .bubble,.document .compare-col .body,.document .compare-col .head{font-size:16px}
.document .annotate{font-size:18px}
.document .diagram ol li,.document .diagram .diagram-node{font-size:17px}
.document .echart{height:260px}

/* ---------- short screens (projectors 1280×720) ---------- */
@media screen and (min-width:651px) and (max-height:800px){
  .slide{padding-top:22px;padding-bottom:22px}
  .slide h1{font-size:clamp(28px,3vw,40px);margin-bottom:16px}
  .slide li{font-size:clamp(18px,1.8vw,26px)}
  .slide table{font-size:clamp(15px,1.4vw,19px);margin-top:12px}
  .slide th,.slide td{padding:.38em .6em}
  .slide footer{margin-top:12px}
  .diagram{margin-top:12px}.diagram ol li,.diagram .diagram-node{padding:10px 12px}
  .echart{height:calc(var(--h,320px) * .82)}
  .visual-hole{max-height:46vh}
  .card{padding:12px 14px}
  .exercise{padding:12px 16px;margin-top:12px}
}

/* ---------- narrow screens ---------- */
@media(max-width:650px){
  .toolbar{position:sticky;top:0;z-index:30;gap:.4rem;padding:.4rem .6rem}.toolbar select{max-width:none;order:2;width:100%}
  .toolbar #prev,.toolbar #next{min-width:44px;min-height:40px}
  .toolbar .home-button{width:44px;height:40px}
  .slide{min-height:0;padding:30px 20px}
  .slide h1{font-size:28px}.slide li{font-size:20px}.slide table{font-size:15px}
  .split,.split.wide-visual,.hero-grid{grid-template-columns:1fr}
  .cards,.compare-cols,.charts,.nest{grid-template-columns:1fr!important}
  .compare-row{grid-template-columns:1fr;gap:6px}.compare-row .arrow:after{transform:rotate(135deg)}
  .stack .layer{grid-template-columns:1fr;gap:4px}
  .decision .step{grid-template-columns:1fr}.decision .no:after{display:none}
  .diagram ol{display:block}.diagram ol li{margin-bottom:22px}.diagram ol li:not(:last-child):after{right:50%;top:auto;bottom:-17px;transform:rotate(135deg)}
  .diagram-group,.diagram-branches,.diagram-exchange{flex-direction:column}
  .toc{columns:1}.document{padding:22px 18px}.document .note-row{grid-template-columns:1fr;gap:4px}
  .exchange-link{flex-direction:row;gap:24px}
}

/* ---------- print ---------- */
@media print{
  @page{size:A4 landscape;margin:12mm}
  body{background:#fff}
  .toolbar,.copy,.screen-only{display:none!important}
  .slide,.slide[hidden]{display:block!important;min-height:0;height:auto;padding:8mm 4mm;break-after:page}
  .slide:last-child{break-after:auto}
  .slide h1{font-size:26pt;margin-bottom:12pt}
  .slide li{font-size:16pt;line-height:1.5}
  .slide table{font-size:12pt}
  .slide .prompt{display:none}
  .slide footer{font-size:8pt}
  .card,.compare-col,.bubble,.echart-box,.exercise,.stack .layer,.annotate,.diagram ol li,.diagram .diagram-node{box-shadow:none;border:1px solid var(--grey)}
  .document{max-width:none;padding:0}.document article{break-before:page}
  .document h1{font-size:22pt}.document h2{font-size:18pt}.document p,.document li{font-size:11pt}
  .print-only{display:block}a{color:inherit}
}

/* ---------- media (existing teaching images) ---------- */
.media-layout{display:grid;grid-template-columns:minmax(0,55fr) minmax(0,45fr);gap:28px;align-items:center}.media-layout>*{min-width:0}
.teaching-media{margin:0!important}.teaching-media img{display:block;width:100%;height:auto;max-height:54vh;object-fit:contain;border-radius:var(--radius)}
.teaching-media figcaption{font-size:14px;line-height:1.5;font-weight:400;color:var(--muted);margin:9px 0 0}
.document .media-layout{grid-template-columns:1fr;margin:24px 0}
@media(max-width:650px){.media-layout{grid-template-columns:1fr;gap:18px}}

/* annotate legend, layout fixes */
.annotate .seg{border-bottom-width:4px}
.annotate .mk,.annotate-legend .mk{display:inline-grid;place-items:center;width:1.45em;height:1.45em;border-radius:50%;font-size:.55em;font-weight:700;color:#fff;margin-left:.25em;vertical-align:.35em;line-height:1}
.annotate .k1 .mk,.annotate-legend .k1 .mk{background:var(--blue)}
.annotate .k2 .mk,.annotate-legend .k2 .mk{background:var(--amber-ink)}
.annotate .k3 .mk,.annotate-legend .k3 .mk{background:var(--green)}
.annotate .k4 .mk,.annotate-legend .k4 .mk{background:#6A5A9C}
.slide .annotate-legend{display:flex;flex-wrap:wrap;gap:12px 28px;margin-top:16px}
.slide .annotate-legend li{padding:0;font-size:clamp(16px,1.6vw,23px);display:flex;align-items:center;gap:10px}
.slide .annotate-legend li:before{display:none}
.annotate-legend .mk{font-size:15px;margin:0;vertical-align:0}
.split .diagram ol{gap:18px}.split .diagram ol li{flex-basis:105px;padding:12px 12px 10px}
.split .diagram ol li:not(:last-child):after{right:-14px}
.split .diagram-group .diagram-node{flex-basis:120px}
[id="2-04"] .diagram ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
[id="2-04"] .diagram ol li{min-width:0;padding:12px 14px}
[id="2-04"] .diagram ol li:not(:last-child):after{display:none}
@media(max-width:650px){[id="2-04"] .diagram ol{display:block}[id="2-04"] .diagram ol li{margin-bottom:12px}}
.stack .layer h3{font-size:clamp(18px,1.8vw,26px)}.stack .layer p{font-size:clamp(16px,1.55vw,22px)}
@media screen and (min-width:651px) and (max-height:800px){.slide-lead{font-size:clamp(18px,1.8vw,24px);margin-bottom:8px}.split .diagram ol li p,.split .diagram .diagram-node p{font-size:14px}.split .diagram figcaption{font-size:16px;margin-bottom:8px}}
@media screen and (min-width:651px) and (max-height:800px){.slide table:has(tbody tr:nth-child(7)){font-size:clamp(14px,1.25vw,17px)}.slide table:has(tbody tr:nth-child(7)) td,.slide table:has(tbody tr:nth-child(7)) th{padding:.28em .55em}}
.slide table:has(tbody tr:nth-child(7)){font-size:clamp(14px,1.3vw,20px)}
.slide table:has(tbody tr:nth-child(7)) td,.slide table:has(tbody tr:nth-child(7)) th{padding:.32em .6em}
@media screen and (min-width:651px) and (max-height:800px){.slide:has(tbody tr:nth-child(7)) h1{margin-bottom:10px}.slide:has(tbody tr:nth-child(7)) .slide-lead{font-size:17px;margin-bottom:4px}.slide:has(tbody tr:nth-child(7)) .slide-after{margin-top:8px}}

/* ===== 海報風格（召喚 AI 助教研習海報）：紙感米白、深藏青、朱橘圓與軌道線 ===== */
:root{--bg:#F3F0EA;--ink:#14213D;--blue:#16294A;--blue-2:#2B4A80;--blue-soft:#E4E8F0;
  --amber:#EE5A2E;--amber-ink:#B8401A;--amber-soft:#FBE3D8;--line:#DCD6CB}
body{background:var(--bg)}
.slide h1{font-weight:900;color:var(--blue);letter-spacing:-.005em}
.eyebrow{letter-spacing:.18em;font-weight:600}
.level{background:var(--blue);color:#fff;border-color:var(--blue);border-radius:2px;letter-spacing:.12em;padding:1px 10px}
.slide li:before{border-radius:50%;background:var(--blue)}
/* 每頁右上角：細直線與兩顆軌道點，呼應海報 */
@media screen and (min-width:1100px){
  .slide:after{content:"";position:absolute;top:0;right:clamp(18px,2.4vw,40px);width:1px;height:min(46vh,380px);background:linear-gradient(var(--blue),var(--blue)) no-repeat center/1px 100%;pointer-events:none;opacity:.55}
  .slide:before{content:"";position:absolute;top:min(46vh,380px);right:calc(clamp(18px,2.4vw,40px) - 7px);width:15px;height:15px;border-radius:50%;background:var(--amber);box-shadow:0 -60px 0 -3px var(--blue);pointer-events:none}
}
/* 封面：大朱橘圓＋軌道 */
.slide.hero{overflow:hidden}
.slide.hero h1{font-size:clamp(46px,6.4vw,96px);line-height:1.08;margin-bottom:14px}
.slide.hero .hero-grid>div:first-child{position:relative;z-index:1}
.orbit{position:absolute;pointer-events:none;z-index:0}
.slide.hero .visual-hole{background:rgba(255,255,255,.55);backdrop-filter:blur(2px)}
.poster-tag{display:inline-block;background:var(--amber);color:#fff;font-weight:800;letter-spacing:.3em;padding:.25em .7em .25em .9em;font-size:clamp(16px,1.6vw,24px);margin:6px 0 14px}
.en-label{font-size:12px;letter-spacing:.32em;color:var(--blue);text-transform:uppercase;font-weight:600}
/* 序號用海報的朱橘數字 */
.cards.timeline .card .num{background:transparent;color:var(--amber);font-size:clamp(20px,2vw,30px);width:auto;height:auto;font-weight:800;letter-spacing:.02em;margin-bottom:2px}
.cards.timeline .card.tone-muted .num{background:transparent;color:var(--muted)}
.diagram ol li:before{background:transparent;color:var(--amber);font-size:1.1em;width:auto;height:auto;font-weight:800}
.card{border-top-color:var(--blue);border-radius:4px}
.card.tone-amber{border-top-color:var(--amber)}
.compare-col,.bubble,.echart-box,.exercise,.annotate,.stack .layer,.diagram ol li,.diagram .diagram-node{border-radius:6px}
.exercise{border-top-color:var(--amber)}
th{border-bottom-color:var(--blue)}
.slide footer{border-top:1px solid var(--blue);border-top-color:rgba(22,41,74,.35)}
.hero-art{position:relative;align-self:stretch;min-height:52vh}
.hero-art .orbit-art{position:absolute;right:calc(-1 * clamp(28px,6vw,92px));top:50%;transform:translateY(-50%);width:min(62vw,820px);height:auto}
.slide.hero:after,.slide.hero:before{display:none}
@media(max-width:650px){.hero-art{min-height:240px}.hero-art .orbit-art{width:110%;right:-20px}}
.document .hero-art{display:none}
.hero-art{min-height:58vh;overflow:visible}
.hero-art .orbit-art{width:min(48vw,660px);right:calc(-1 * clamp(20px,4vw,70px))}
.slide.hero .hero-grid{grid-template-columns:minmax(0,52fr) minmax(0,48fr)}
@media screen and (min-width:651px) and (max-height:800px){.hero-art{min-height:52vh}.hero-art .orbit-art{width:min(44vw,560px)}}

.visual-brands{display:flex;gap:12px;justify-content:center;margin:8px 0 0}.visual-brand{display:inline-flex;align-items:center;gap:6px;border:1px solid #c8d2df;border-radius:999px;padding:5px 11px;background:#fff;color:#16294a;font-size:13px;font-weight:700}.visual-brand b{font-size:17px;line-height:1;color:#1d3a6e}

/* diagram node icons (e.g. 4-03) */
.diagram .diagram-ico{width:34px;height:34px;display:block;margin-bottom:6px;fill:none;stroke:var(--blue);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
/* mobile: controls stay fixed at the top while scrolling */
@media screen and (max-width:650px){body>.toolbar{position:sticky;top:0}}
/* 外部資訊免責小字（第一頁與最後一頁） */
.slide footer .fineprint{display:block;margin-top:6px;font-size:12px;line-height:1.5;color:var(--muted);opacity:.85}

/* 四堂投影片的節制橘色節奏：只標閱讀起點與已有語意的重點詞。 */
.slide .eyebrow::before{content:"";width:7px;height:7px;flex:none;border-radius:50%;background:var(--amber)}
.slide > ul > li:first-child::before,.slide .split-main > ul > li:first-child::before{background:var(--amber)}
.slide > ul > li strong,.slide .split-main > ul > li strong,.slide .slide-lead strong,.slide .slide-after strong{color:var(--amber-ink);font-weight:800}
.slide table thead th:first-child{color:var(--amber-ink);border-bottom-color:var(--amber)}
.slide .cards.icon > .card:first-child:not(.tone-muted){border-top-color:var(--amber)}
.slide .cards.icon > .card:first-child:not(.tone-muted) .ico{stroke:var(--amber-ink)}