.concept-visual{margin:26px 0;padding:26px;border:1px solid #b9d7d1;border-radius:18px;background:linear-gradient(135deg,#f0faf7,#f4f6ff)}.concept-visual h3{font-size:1.3rem;margin:8px 0 20px}.concept-flow{list-style:none;padding:0;display:flex;gap:16px;flex-wrap:wrap;margin:0 0 24px}.concept-flow li{position:relative;flex:1 1 140px;padding:18px 16px;background:white;border:1px solid #dbe5ec;border-radius:12px;display:flex;flex-direction:column;gap:8px;min-width:0}.concept-flow li:not(:last-child):after{content:'→';position:absolute;right:-16px;top:40%;font-size:18px;color:#177e72;z-index:1}.flow-number{font:700 12px monospace;color:#177e72}.concept-flow strong{font-size:1.05rem}.concept-flow li>span:last-child{font-size:.87rem;color:#506481}.concept-visual table{background:white;width:100%;font-size:.94rem}.concept-visual th{background:#1d3659;color:white}.concept-visual td,.concept-visual th{padding:12px 14px;vertical-align:top}.concept-visual tr:nth-child(even){background:#f7fafc}.lesson-details{margin:24px 0;border-left:3px solid #d5deed;padding:4px 18px}.lesson-details summary{cursor:pointer;font-weight:700;color:#243d6b;padding:8px 0}.lesson-details p{line-height:1.9}.trace-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}.trace-grid>*{min-width:0}.visual-lab label{display:block;margin:16px 0}.visual-lab input[type=range]{width:100%;accent-color:#177e72}.visual-lab svg{width:100%;background:#f6f9fc;border-radius:10px}.pixel-grid{display:grid;grid-template-columns:repeat(8,1fr);max-width:420px;aspect-ratio:1;border:2px solid #1b3555}.pixel-grid span{display:grid;place-items:center;font:12px monospace;border:1px solid #8292a466}.color-swatch{height:100px;border-radius:12px;border:1px solid #ccd7e8}.summary-page,.teacher-page{max-width:1200px;margin:45px auto;padding:24px}.summary-page>h1,.teacher-page>h1{font-size:clamp(2rem,4vw,3.5rem)}.teacher-note{border:1px solid #e6c874;background:#fff9e7;border-radius:12px;padding:20px;margin:24px 0}.teacher-note summary{font-weight:700;cursor:pointer}.teaching-slide{padding:24px 0;border-bottom:1px solid #dbe2ec;scroll-margin-top:90px}.teaching-slide>h2{font-size:1.8rem}.slide-toolbar{position:sticky;top:0;z-index:25;display:flex;gap:12px;flex-wrap:wrap;background:#fff;padding:12px;border:1px solid #dbe2ec;border-radius:12px;align-items:center}.projecting .top,.projecting footer,.projecting .teacher-note,.projecting .teacher-overview,.projecting .teacher-page>h1,.projecting .teacher-page>.lead,.projecting .teacher-page>.eyebrow{display:none}.projecting .teaching-slide{display:none}.projecting .teaching-slide.current{display:block}.projecting .teacher-page{max-width:1450px;margin:0 auto}.projecting .concept-visual{font-size:1.15rem}.projecting .concept-visual table{font-size:1.15rem}.plot-output{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px}.plot-output figure{margin:0;padding:10px;background:#fff;border:1px solid #dbe2ec;border-radius:12px}.plot-output img{max-width:100%;height:auto}.top nav{flex-wrap:wrap}.teacher-link{font-size:.9rem}.visual-summary-link{display:inline-flex;margin:12px 0}.learning-map{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:25px 0}.learning-map a{border:1px solid #bdcddd;border-radius:12px;padding:18px;background:#fff;text-decoration:none}.learning-map b{display:block;font:700 1.7rem monospace;color:#178276}.learning-map span{display:block;margin-top:8px}
@media(max-width:700px){.trace-grid{grid-template-columns:1fr}.concept-visual{padding:16px;margin:20px 0}.concept-flow{gap:12px}.concept-flow li{flex-basis:calc(50% - 12px);padding:12px}.concept-flow li:not(:last-child):after{display:none}.concept-visual .table-wrap{margin:0 -4px}.concept-visual table{min-width:420px}.teacher-page,.summary-page{padding:16px;margin:20px auto}.learning-map{grid-template-columns:1fr 1fr}.slide-toolbar{position:relative}.projecting .concept-visual table{font-size:.95rem}.top nav{gap:10px!important}.top{height:auto!important}.pixel-grid span{font-size:10px}}
@media print{.top,footer,.slide-toolbar,.teacher-note,button,.teacher-overview,.lesson-details,.completion{display:none!important}.teaching-slide{display:block!important;break-after:page;border:0}.concept-visual{break-inside:avoid;background:#fff;padding:12px}.concept-flow li{border:1px solid #777}.concept-visual th{background:#eee;color:black}.table-wrap{overflow:visible}.teacher-page,.summary-page{max-width:none;margin:0;padding:0}.concept-visual table{min-width:0}.teaching-slide h2{font-size:22px}}

.science-picture{display:block;background:white;border-radius:12px;padding:12px;margin:15px 0 24px;text-decoration:none}.science-picture img{width:100%;height:auto;max-height:350px;object-fit:contain}.science-picture span{font-size:.8rem;display:block;color:#506481;text-align:center}.projecting .science-picture img{max-height:260px}

.comparison-flow li:after,.comparison-flow .flow-number{display:none}.dependency-map{display:flex;align-items:center;gap:12px;margin:24px 0}.dependency-map>div{background:white;padding:20px 12px;border:1px solid #c4d2e4;border-radius:12px;flex:1;min-width:0}.dependency-map span{display:block;font-size:.85rem;margin-top:8px;overflow-wrap:anywhere}.dependency-map .shared-module{background:#daf4eb;border:2px solid #22897c}.dependency-map>b{color:#22897c;font-size:24px}.set-map{padding:18px;border:2px solid #344c81;background:#e7eefb;border-radius:14px;font-weight:700;margin-bottom:22px}.set-map>div{margin:12px 0 0 35px;padding:18px;border:2px solid #28867b;border-radius:12px;background:#ddf3e9}.set-map>div>div{margin:12px 0 0 35px;padding:18px;border:2px solid #d4b04a;border-radius:12px;background:#fff1bc}@media(max-width:700px){.dependency-map{flex-direction:column}.dependency-map>div{width:100%}.dependency-map>b{transform:rotate(90deg)}.set-map>div,.set-map>div>div{margin-left:12px}}

/* Textbook hierarchy: book numbering is independent of web activity order. */
.book-toc {margin:24px 0;padding:20px;border:1px solid var(--line,#cbd5e1);border-radius:16px;background:var(--surface,#fff)}
.book-toc h2 {font-size:1.25rem}.book-toc h3 {font-size:1.05rem;margin-bottom:4px}
.book-toc ol,.book-toc ul {list-style:none;padding:0}.book-toc ol>li {margin:16px 0;padding-left:12px;border-left:3px solid #148575}
.book-toc ul {margin-top:6px}.book-pages {display:block;font-size:.85rem;color:#475569}
.book-middle+.book-middle {border-top:1px solid #cbd5e1;margin-top:16px;padding-top:8px}
.book-review {font-size:.85rem;color:#475569}.book-extra a {display:block;margin:8px 0}
.book-location {padding:12px 16px;border-left:4px solid #148575;background:#eef8f5;border-radius:8px;margin-bottom:20px;color:#163d39}
.book-location p {margin:5px 0}.book-location span,.book-topic-pages {font-size:.85rem}
.rail .book-toc {padding:0;border:0;background:transparent;margin-top:12px}.rail .book-toc h2 {font-size:1rem}
.rail .book-toc h3 {font-size:.92rem}.rail .book-toc strong {font-size:.86rem}.rail .book-toc a {font-size:.82rem;padding:7px 0}
.rail .book-toc li {margin:10px 0}.rail .book-toc p {font-size:.8rem}
.projecting .teacher-page>.book-toc {display:none}
@media print {.teacher-page>.book-toc {display:none}.book-location {break-inside:avoid}}
.lesson-workspace {margin:24px 0;border-top:2px solid #b8d8d2;padding-top:22px;min-width:0}
.lesson-workspace .lab {padding:20px 0;margin:12px 0 0;border:0;box-shadow:none;border-radius:0;background:transparent;scroll-margin-top:100px}
.lesson-workspace .lab h2 {font-size:22px}
.example-links button[aria-pressed=true] {border-color:#117365;background:#e9f7f2;color:#114e43}
.lesson-workspace .editor-layout {grid-template-columns:145px minmax(0,1fr)}
@media(max-width:700px){.lesson-workspace .editor-layout{grid-template-columns:1fr}.lesson-workspace .lab h2{font-size:19px}.lesson-workspace .editor-bar{flex-wrap:wrap}}
.topic-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:20px 0}
.topic-card{display:flex;flex-direction:column;gap:8px;padding:20px;border:1px solid var(--line,#dce3ed);border-radius:14px;background:#fff;text-decoration:none;color:inherit;min-width:0}
.topic-card:hover{border-color:#117365;background:#f3faf7}
.topic-card .number{font:700 13px var(--mono,monospace);color:#117365}
.topic-card h3{margin:0;font-size:1.05rem}
.topic-card p{margin:0;color:#506481;font-size:.92rem}
.topic-card>span:last-child{margin-top:auto;font-weight:700;color:#1e2761}
.lesson-prose{margin:20px 0 8px}
.lesson-prose p{line-height:1.9}
.topic-hero h1{font-size:clamp(1.8rem,3vw,2.6rem)}
.topic-nav{margin:28px 0 12px;flex-wrap:wrap}
.topic-hero .eyebrow a{color:inherit}
.content-slots{margin:28px 0;padding:22px;border:1px solid #c9d8e8;border-radius:16px;background:#fff}
.content-slots>h3{margin:6px 0 8px;font-size:1.15rem}
.pre-api{border-color:#b9d7d1;background:linear-gradient(180deg,#f3fbf8,#fff)}
.content-tips{border-color:#ead9a8;background:linear-gradient(180deg,#fff9e8,#fff)}
.content-shots{border-color:#d5deed;background:#f7f9fc}
.api-grid,.glossary-grid,.tip-grid,.shot-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:16px 0 0}
.api-card,.glossary-card,.tip-history,.tip-youtube{margin:0;padding:14px 16px;border:1px solid #dbe5ec;border-radius:12px;background:#fff;min-width:0}
.api-card strong,.glossary-card strong{display:block;color:#1d3659}
.api-card code{display:block;margin:8px 0;padding:8px 10px;background:#f4f7fc;border-radius:8px;font-size:.82rem;white-space:pre-wrap;overflow-wrap:anywhere}
.api-card p,.glossary-card p,.tip-history p,.tip-youtube p{margin:8px 0 0;font-size:.92rem;color:#506481}
.example-guides{display:grid;gap:18px;margin:20px 0}
.example-guide{padding:8px 0 4px;border-top:1px dashed #dce3ed}
.example-guide>h3{margin:0 0 8px;font-size:1.05rem}
.content-shot{margin:0;padding:10px;background:#fff;border:1px solid #dbe2ec;border-radius:12px}
.content-shot img{display:block;width:100%;height:auto;max-height:260px;object-fit:contain;background:#e8ecf1}
.content-shot figcaption{margin-top:8px;font-size:.82rem;color:#506481;text-align:center}
@media(max-width:700px){.api-grid,.glossary-grid,.tip-grid,.shot-grid{grid-template-columns:1fr}.content-slots{padding:16px}}