.learning-intro{padding-block:36px 12px}.learning-intro h1{font-size:clamp(28px,4vw,42px);margin:14px 0}.learning-intro>a{font-size:13px;color:#4d7c0f}.learning-intro .label{margin-top:24px}.section{padding-block:32px}.section>h2{margin-bottom:20px}.brand img{border-radius:8px}.card{overflow-wrap:anywhere}blockquote{margin:16px 0;padding:14px;background:#f0f5fc;border-left:3px solid #4d7c0f;font-size:15px}label{display:block;margin:18px 0 8px;font-size:14px;font-weight:600}select,textarea{display:block;width:100%;padding:12px;border:1px solid #8fa3c4;border-radius:8px;background:white;color:#0a1322;margin-bottom:14px}textarea{min-height:190px;line-height:1.8;resize:vertical}details{border:1px solid #dde7f5;border-radius:12px;padding:16px;margin:16px 0;background:white}summary{cursor:pointer;font-weight:600;min-height:28px}pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#101f38;color:#dde7f5;border-radius:12px;padding:20px;font:13px/1.8 ui-monospace,monospace}.table-scroll{overflow-x:auto}table{border-collapse:collapse;width:100%;min-width:460px;font-size:14px}td,th{padding:12px;text-align:left;border-bottom:1px solid #dde7f5}th{background:#f0f5fc}.button{margin:8px 8px 8px 0}.dark details,.dark select,.dark textarea{background:#101010;color:#fafafa;border-color:#525252}.dark blockquote,.dark th{background:#1b1b1b}.dark td{border-color:#2b2b2b}@media(max-width:639px){.learning-intro{padding-top:24px}.versions a{font-size:11px;padding-inline:5px}.brand{font-size:14px}textarea{font-size:16px}.button{min-height:44px}.section{padding-block:26px}}

.practice-nav{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}.practice-nav a{padding:8px 14px;border:1px solid #cad7e6;border-radius:99px;font-weight:600}.practice-steps{display:grid;grid-template-columns:repeat(4,1fr);list-style:none;padding:0;gap:8px}.practice-steps li{padding:12px;background:#eef5e6;border-radius:8px;color:#26420e;font-size:14px}#practice-progress{padding:12px 16px;border-left:3px solid #4d7c0f;background:#f5f8f0}#review{padding:24px;border:1px solid #cad7e6;border-radius:14px;margin-top:20px}section[id]{scroll-margin-top:100px}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #4d7c0f;outline-offset:4px}#review-result:not(:empty),#content-result:not(:empty),#qa-result:not(:empty){padding:12px;border-left:3px solid #4d7c0f;background:#f5f8f0}.dark .practice-steps li,.dark #practice-progress,.dark #review-result,.dark #content-result,.dark #qa-result{background:#182311;color:#e2edda}@media(max-width:639px){.practice-steps{grid-template-columns:repeat(2,1fr)}.practice-steps li{padding:9px}#review{padding:16px}.practice-nav a{font-size:14px}.learning-intro h1{line-height:1.3}}
.shell{min-width:0}.grid>*{min-width:0}.learning-intro{max-width:1152px}.learning-intro h1{max-width:880px;line-height:1.35}.section>p{max-width:860px;line-height:1.85}.practice-nav a{min-height:44px;display:inline-flex;align-items:center}.table-scroll{max-width:100%;overscroll-behavior-inline:contain}.dark .learning-intro>a{color:#e2edda}.dark #review{border-color:#525252}.dark .practice-nav a{border-color:#525252;color:#fafafa}input[type="checkbox"]{width:18px;height:18px;margin-right:8px;accent-color:#4d7c0f}@media(max-width:639px){.shell{padding-inline:20px}.learning-intro h1{font-size:28px}.grid.three{grid-template-columns:1fr}.actions>.button{width:100%;margin-right:0}summary{line-height:1.6}.global-nav{flex-wrap:wrap}.versions a{font-size:12px}}

.book-routes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:20px}.book-routes a{padding:14px 18px;border:1px solid var(--line);border-radius:10px;font-size:14px;font-weight:600;background:white}.chapter-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}.chapter-list a{display:grid;grid-template-columns:70px minmax(0,1fr) 24px;gap:16px;align-items:center;padding:18px 8px;border-bottom:1px solid var(--line);line-height:1.6}.chapter-list a:hover{background:#eef5e6}.chapter-number{font-size:13px;color:#526075}.dark .book-routes a{background:#101010}.dark .chapter-list a:hover{background:#182311}.dark .chapter-number{color:#a3a3a3}textarea:focus-visible,select:focus-visible{outline:3px solid #65a30d;outline-offset:3px}@media(max-width:639px){.book-routes{grid-template-columns:1fr;gap:8px}.chapter-list a{grid-template-columns:48px minmax(0,1fr) 16px;gap:10px;padding:15px 0;font-size:15px}}

/* Learning navigation, 2026-10-15 */
.lesson-contents{margin:12px 0 8px;padding:16px 20px;border:1px solid var(--line);background:transparent}.lesson-contents summary{font-size:15px;min-height:32px;display:list-item}.lesson-contents nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 20px;margin-top:14px}.lesson-contents a{padding:8px 0;line-height:1.6;overflow-wrap:anywhere;text-decoration:underline;text-underline-offset:4px}#learning-next{border-top:1px solid var(--line);margin-top:16px}#learning-next .textlink{display:inline-flex;min-height:44px;align-items:center;margin-left:12px}@media(max-width:639px){.lesson-contents{padding:14px 16px}.lesson-contents nav{grid-template-columns:1fr;gap:2px}#learning-next .textlink{margin-left:0;display:flex}}