@import url("/assets/learning-tools.css?v=2026.10.29.1");
.nb-workbook{--leaf:#176347;--ink:#18372c;--mist:#f4f8f3;color:var(--ink)}
.nb-workbook .nb-intro{max-width:72ch;line-height:1.7}
.nb-workbook .nb-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;margin:1.5rem 0}
.nb-workbook .nb-card{border:1px solid #d1dfd2;border-radius:1rem;padding:1.4rem;background:var(--mist);box-shadow:0 2px 8px #19392a0b}
.nb-workbook .nb-card h3{margin:.2rem 0 .7rem;font-size:1.3rem}
.nb-workbook .nb-card p{line-height:1.65}
.nb-workbook .nb-pill{display:inline-block;font-size:.8rem;font-weight:700;color:#145238;background:#e0f1e7;padding:.25rem .6rem;border-radius:99px;margin-bottom:.4rem}
.nb-workbook .nb-module{margin:1rem 0;border:1px solid #cadccf;border-radius:.9rem;background:#fff;overflow:hidden}
.nb-workbook .nb-module>summary{cursor:pointer;padding:1rem 1.25rem;font-size:1.08rem;font-weight:700;color:var(--ink);background:#f4f8f3;list-style-position:inside}
.nb-workbook .nb-module>summary:hover,.nb-workbook .nb-module>summary:focus-visible{background:#e4f1e9}
.nb-workbook .nb-module-body{padding:1.25rem 1.5rem;max-width:78ch;line-height:1.65}
.nb-workbook .nb-module-body h4{margin:1.2rem 0 .4rem;font-size:1rem}
.nb-workbook .nb-module-body p{margin:.35rem 0 .8rem}
.nb-workbook .nb-sample{padding:.9rem 1.1rem;background:#f6f5eb;border-inline-start:4px solid var(--leaf);border-radius:.25rem;white-space:pre-line}
.nb-workbook .nb-answer{margin-top:1rem;padding:.7rem 1rem;border:1px solid #d1dfd2;border-radius:.6rem}
.nb-workbook .nb-answer summary{cursor:pointer;font-weight:700;color:var(--leaf)}
.nb-workbook .nb-notice{padding:1rem 1.3rem;border-inline-start:4px solid #a46539;background:#fff6e8;max-width:78ch;line-height:1.65}
.nb-workbook a{overflow-wrap:anywhere}
@media(max-width:850px){.nb-workbook .nb-grid{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.nb-workbook .nb-grid{grid-template-columns:1fr}.nb-workbook .nb-module-body{padding:1rem}.nb-workbook .nb-module>summary{padding:.9rem}}