/* Self-contained chapter additions; original field guide CSS remains unchanged. */
.curr-nav{background:#142e42;min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:22px;padding:13px max(22px,calc((100vw - 1150px)/2));color:#fff}
.curr-brand{display:flex;align-items:center;gap:13px;font-family:Georgia,serif;font-size:19px;line-height:1.2;color:#fff}.curr-brand:hover{color:#fff;text-decoration:none}.curr-mark{display:grid;place-items:center;border-radius:10px;width:39px;height:39px;background:#087974;font:bold 23px Georgia}.curr-brand small{display:block;font:800 9px/1.5 system-ui;letter-spacing:.1em;color:#9ec7c5}.curr-top-links{display:flex;gap:22px;flex-wrap:wrap}.curr-top-links a{font-size:13px;font-weight:700;color:#cfe8e4}.curr-top-links a:hover{color:white}.curr-shell{width:min(1120px,calc(100% - 42px));margin:auto;padding:25px 0 55px}.curr-crumbs{display:flex;flex-wrap:wrap;gap:8px;font-size:12px;color:#607a87;margin:4px 0 22px}.curr-crumbs span{color:#9ab1b4}.curr-pagehead{padding:15px 0 24px;border-bottom:1px solid #dce7e7;margin-bottom:27px}.curr-overline{font-size:11px;letter-spacing:.13em;text-transform:uppercase;color:#087974;font-weight:800;margin:0 0 6px}.curr-pagehead h1{font-size:clamp(30px,4.2vw,52px);margin:0 0 9px}.curr-lede{font-size:16px;color:#647a88;max-width:850px}.curr-panel{background:white;border:1px solid #dae7e6;border-radius:15px;padding:clamp(19px,3vw,31px);margin:19px 0;box-shadow:0 7px 19px rgba(15,52,63,.025)}.curr-panel h2{font:500 clamp(23px,2.7vw,30px) Georgia,serif;margin:0 0 17px}.curr-panel h3{font-size:17px;margin:21px 0 6px}.curr-panel p{max-width:850px}.curr-panel ul li{margin:8px 0}.lead-panel{border-top:4px solid #087974;background:#fbfefc}.lead-challenge{font-size:20px;font-family:Georgia,serif;color:#1e5661}.goals{display:grid;grid-template-columns:1fr 1fr;gap:24px}.goals h3{margin:16px 0 5px;font-size:15px}.goals ul{padding-left:19px}.badge-row{display:flex;gap:9px;flex-wrap:wrap;margin-bottom:16px}.tag{display:inline-block;background:#e7f4f0;border-radius:8px;color:#086d64;font-size:11px;font-weight:800;padding:5px 9px}.tag.muted{background:#f1f4f5;color:#657d87}.curr-model{border:1px solid #d5e8e6;border-radius:12px;padding:20px;background:#f5faf9;margin:26px 0}.curr-model figcaption{font-size:13px;color:#526d78;margin-top:13px}.pv-visual{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.pv-visual>div{background:#fff;border:1px solid #a7cac9;border-radius:9px;display:flex;flex-direction:column;align-items:center;gap:4px;padding:11px 6px}.pv-visual small{color:#52707b;font-size:12px}.pv-visual strong{font:32px Georgia;color:#1a5d67}.pv-visual span{color:#52707b;font-size:11px}.exchange-visual{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:center}.exchange-visual>div{background:white;border:1px solid #a7cac9;border-radius:10px;padding:17px;text-align:center}.exchange-visual span{display:block;font:28px Georgia;color:#1a5d67}.exchange-visual small{display:block;color:#526d78}.compare-visual{display:flex;gap:25px;align-items:center;justify-content:center;font:clamp(27px,5vw,42px) Georgia}.compare-visual b{color:#078378}.number-line-svg{width:100%;height:auto}.number-line-svg text{font:15px Georgia;fill:#284958}.number-line-svg .number-label{font-weight:700;fill:#087974}.pattern-visual{display:flex;gap:9px;flex-wrap:wrap}.pattern-visual>div{padding:18px;background:white;border:1px solid #a7cac9;border-radius:8px;font:24px Georgia;color:#1a5d67}.curr-tip{margin:20px 0;background:#e9f5f0;border-left:4px solid #087974;padding:15px 19px;border-radius:2px 9px 9px 2px}.curr-tip p{margin:6px 0 0}.worked-example{margin:23px 0;padding:20px;border-left:3px solid #75b7ab;background:#fbfefc;border-radius:0 11px 11px 0}.worked-example h3{font:500 23px Georgia,serif;margin:5px 0 10px}.worked-steps{padding-left:26px;margin:12px 0}.worked-steps li{padding-left:4px;margin:7px 0}.worked-result{border-radius:8px;background:#e7f4ef;padding:11px 15px;color:#1b6156;font-size:17px}.understanding{background:white;border:1px dashed #96bcb5;border-radius:9px;padding:14px 16px;margin:17px 0 0}.check-label{font-weight:800;text-transform:uppercase;letter-spacing:.07em;color:#24796f;font-size:11px;margin:0 0 8px}.understanding details{margin-top:10px}.understanding details p{background:#ecf6f1;padding:11px;border-radius:8px}.practice-set{scroll-margin-top:30px}.section-heading{display:flex;align-items:start;justify-content:space-between;gap:14px;flex-wrap:wrap}.section-heading h2{margin-bottom:9px}.curr-button{background:#087974;color:white;border:0;border-radius:8px;font:750 13px system-ui;display:inline-block;padding:12px 17px;cursor:pointer;text-decoration:none}.curr-button:hover{filter:brightness(1.08);text-decoration:none;color:white}.curr-button.ghost{background:#e6f3ef;color:#076b60;border:1px solid #acd8ca}.question-list{list-style:none;padding:0!important;counter-reset:none}.curr-question{border-top:1px solid #e4eded;padding:13px 0;margin:0!important}.curr-question>div{display:flex;gap:11px;line-height:1.55}.qcode{display:inline-grid;place-items:center;background:#eff4f4;border-radius:6px;padding:2px 6px;flex-shrink:0;font-size:11px;font-weight:800;color:#53727f;min-width:33px;align-self:start}.curr-question details{margin:10px 0 4px 41px}.curr-question summary,.understanding summary{color:#087974;font-weight:700;font-size:13px;cursor:pointer}.curr-question details p{font-size:14px;line-height:1.5;background:#edf7f2;margin:8px 0 0;padding:10px;border-radius:7px}.curr-note{background:#f3f6f4;border-left:4px solid #a5beb6;padding:15px 18px;margin:28px 0;font-size:14px}.curr-next{display:flex;flex-wrap:wrap;gap:11px;margin:29px 0}.chapter-mini{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;font-weight:700;padding:14px;border-radius:10px;background:#e7f4f0}.chapter-mini span{color:#54747a}.curr-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:17px 0 21px}.curr-stats div{border:1px solid #d6e6e3;border-radius:10px;background:#f9fcfa;padding:13px;text-align:center}.curr-stats strong{font:34px Georgia;display:block;color:#17786f}.curr-stats small{display:block;font-size:11px}.curr-lessonlist{display:grid;gap:7px}.curr-lessonlink{display:flex;align-items:center;gap:18px;padding:14px 17px;border:1px solid #deebea;border-radius:10px;color:#243c4a;background:#fbfdfc}.curr-lessonlink:hover{border-color:#7fc1b0;text-decoration:none;background:#f3faf7}.curr-lessonlink>div{flex:1}.curr-lessonlink strong{display:block}.curr-lessonlink small{font-size:12px;display:block}.item-index{display:grid;place-items:center;background:#deeee8;color:#126b62;border-radius:8px;width:38px;height:38px;font-size:13px;font-weight:850}.curr-lessonlink.soon{opacity:.62}.curr-ruled{border-left:4px solid #a2bfb4;padding:8px 12px;margin:8px 0 8px 16px}.curr-ruled a{display:flex;flex-wrap:wrap;gap:10px;align-items:baseline}.curr-ruled span{font-size:13px;color:#607985}.curr-cardgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.curr-tile{display:grid;gap:6px;color:#223b49;border:1px solid #d7e8e3;border-radius:11px;background:#fbfdfb;padding:21px}.curr-tile strong{font:23px Georgia}.curr-tile span{color:#617783;font-size:14px}.curr-tile:hover{border-color:#8fc4b9;text-decoration:none}.curr-tile.notyet{opacity:.65}.curr-footer{border-top:1px solid #dce7e7;max-width:1120px;margin:0 auto;padding:25px 16px 45px;color:#627984;font-size:12px}.curr-footer p{margin-bottom:8px}.curr-shell table{width:100%;border-collapse:collapse}.curr-shell th,.curr-shell td{border-bottom:1px solid #e0e9e9;padding:10px;text-align:left;vertical-align:top}.curr-shell th{background:#eff6f4;width:24%}.curr-shell .table-wrap{overflow-x:auto;border-radius:10px;border:1px solid #e0e9e9}.curr-shell .table-wrap table{margin:0}.curr-shell .curr-panel>ol{padding-left:23px}.curr-shell .curr-panel>ol li{margin-bottom:14px}.curr-shell .curr-panel>ol li div{font-size:14px;color:#607681}
@media(max-width:700px){.curr-nav{align-items:start;flex-direction:column;padding:13px 20px;gap:13px}.curr-top-links{gap:13px}.curr-shell{width:calc(100% - 28px)}.goals,.curr-cardgrid{grid-template-columns:1fr}.curr-stats{grid-template-columns:1fr 1fr}.pv-visual{gap:4px}.pv-visual small{font-size:9px}.pv-visual strong{font-size:25px}.pv-visual span{font-size:9px}.exchange-visual{grid-template-columns:1fr}.curr-panel{padding:18px}.curr-crumbs{line-height:1.7}.number-line-svg text{font-size:13px}}
@media print{.curr-nav,.curr-crumbs,.curr-next,.curr-footer,.chapter-mini,.curr-button,.understanding details,.curr-question details,.curr-panel .curr-overline{display:none!important}.curr-shell{width:100%;padding:0}.curr-panel{box-shadow:none;border:0;border-radius:0;padding:6px 0;margin:10px 0}.curr-pagehead{margin:0 0 12px;padding:0 0 10px}.curr-pagehead h1{font-size:27pt}.curr-pagehead .curr-lede{font-size:11pt}.worked-example,.curr-model{break-inside:avoid}.curr-question{break-inside:avoid;padding:11px 0;min-height:53px}.curr-question>div{font-size:10.5pt}.practice-set{break-before:page}.curr-panel h2{font-size:17pt;break-after:avoid}.curr-panel h3{break-after:avoid}.curr-tip{background:white}.curr-cardgrid,.curr-stats,.curr-lessonlist{break-inside:avoid}body{background:#fff}@page{margin:17mm}}