.learning-group{margin:12px 0;border-bottom:1px solid var(--line);padding-bottom:10px}.learning-group summary{font-size:13px;font-weight:700;cursor:pointer;padding:8px 2px}.learning-group nav a{font-size:12px;line-height:1.5}.learning-actions,.stage-pagination{display:flex;flex-wrap:wrap;align-items:center;gap:18px;margin:24px 0}.stage-pagination{justify-content:space-between;border-top:1px solid var(--line);padding-top:24px}.stage-pagination a{flex:1;min-width:180px}.stage-pagination a:last-child{text-align:right}.lesson-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,245px),1fr));gap:16px}.lesson-card{display:block;padding:22px;border:1px solid var(--line);border-radius:10px;text-decoration:none;background:#fff;transition:box-shadow .15s}.lesson-card:hover{box-shadow:0 5px 20px #183b6414}.lesson-card h3{margin:10px 0;font-size:19px;line-height:1.4}.lesson-card p{font-size:14px;color:var(--muted)}.lesson-card strong{font-size:13px}.lesson-label{font-size:11px;font-weight:750;text-transform:uppercase;letter-spacing:.08em}.lesson-location{font-size:13px;color:var(--muted);margin-bottom:28px}.concept-directory{display:grid;gap:12px}.concept-directory a{padding:17px;border:1px solid var(--line);border-radius:8px;text-decoration:none}.concept-directory span{display:block;font-size:14px;color:var(--muted);margin-top:6px}.concept-directory [hidden]{display:none}#concept-search{display:block;width:100%;font:inherit;padding:12px;border:1px solid #b7c5d7;border-radius:6px;margin:10px 0}.topic-full-guide{display:block;padding:12px 14px;background:#edf3ff;border:1px solid #cedbf0;border-radius:7px;margin:18px 0;font-weight:700;font-size:14px}.learning-group nav a[aria-current]{border-left:3px solid currentColor}@media(max-width:880px){.learning-group nav{display:grid}.learning-group{width:100%}.stage-pagination a:last-child{text-align:left}}
.course-navigation{display:grid;gap:5px}.course-navigation>a,.spring-navigation>summary{display:block;font-size:14px;line-height:1.5;padding:9px 12px;text-decoration:none;border-radius:6px;color:var(--brand-blue);cursor:pointer}.course-navigation>a:hover,.spring-navigation>summary:hover,.course-navigation>a[aria-current],.spring-navigation>.active-branch{background:var(--brand-blue-soft)}.course-navigation>a[aria-current],.spring-navigation>.active-branch{border-left:3px solid var(--brand-blue);font-weight:750}.spring-navigation>summary{display:list-item;list-style-position:inside}.spring-sections{margin:6px 0 12px 13px;padding-left:12px;border-left:1px solid var(--line)}.spring-sections>a{display:block;font-size:12px;padding:8px;text-decoration:none;border-radius:6px}.spring-sections>a[aria-current]{background:var(--brand-blue-soft);font-weight:700}.spring-sections .learning-group{margin:4px 0;padding:0 0 6px}.spring-sections .learning-group summary{font-size:12px;line-height:1.5;padding:8px 2px}.spring-sections nav a{font-size:12px;padding:7px 8px}.spring-navigation summary:focus-visible,.course-navigation a:focus-visible{outline:2px solid var(--brand-blue);outline-offset:2px}

/* stage15-notes:start */
.stage15-recap{background:#eef4ff;border-left:4px solid #164aa5;padding:20px 24px;margin:22px 0;color:#14213a}
.stage15-recap h2{font-size:23px;margin:0 0 12px}.stage15-recap p:last-child{margin-bottom:0}
.stage15-change-map{margin:28px 0}.stage15-legend{display:flex;flex-wrap:wrap;gap:12px;margin:16px 0}
.stage15-legend span{padding:5px 10px;border-radius:4px;font-size:13px;font-weight:700;color:#14213a}
.stage15-legend .reused{background:#deebff}.stage15-legend .added{background:#fff1b8}
.stage15-excerpt mark{color:#14213a;padding:2px 0;background:#fff1b8}.stage15-excerpt mark.reused{background:#deebff}
.stage15-file-change>summary{background:#fff3cc;border-left:4px solid #b97900;padding:12px;overflow-wrap:anywhere}
.stage15-file-badge{display:inline-block;background:#815500;color:#fff;border-radius:4px;padding:2px 7px;font:700 11px/1.6 system-ui;margin-right:8px}
/* stage15-notes:end */