.history-opening{margin-bottom:18px}.lesson-kicker{display:inline-block;color:var(--primary);font-size:11px;font-weight:900;text-transform:uppercase;letter-spacing:.08em;margin-bottom:6px}.central-question{margin-top:12px!important;padding-top:10px;border-top:1px solid #dfcdbc}
.visual-box,.example-box,.source-box,.challenge-box,.quick-question,.method-box{border-radius:12px;margin:15px 0}
.visual-box,.example-box{background:var(--surface-soft);border:1px solid var(--line);padding:15px}
.two-col,.comparison-grid,.evidence-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:14px 0}
.three-col{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:14px 0}
.four-col{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:14px 0}
.mini-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:13px}.mini-card strong{display:block;color:var(--primary-dark);margin-bottom:5px}
.table-wrap{overflow-x:auto;margin:14px 0}.table-wrap table{width:100%;border-collapse:collapse}.table-wrap th,.table-wrap td{border:1px solid var(--line);padding:9px 10px;text-align:left;vertical-align:top}.table-wrap th{background:var(--primary-soft);color:var(--primary-dark)}
.source-box{background:#fffdf9;border:1px solid #dfcfbf;border-left:5px solid var(--primary);padding:16px}.source-box .source-label{display:inline-block;border-radius:999px;background:var(--primary-soft);color:var(--primary-dark);padding:3px 8px;font-size:11px;font-weight:900;margin-bottom:7px}.source-box blockquote{margin:8px 0;padding:10px 13px;background:#faf5ef;border-left:3px solid #c5a88d;font-style:italic}.source-meta{font-size:12px;color:var(--muted)}
.method-box{border:1px solid #d8c2ad;background:linear-gradient(180deg,#fcf7f2,#fff);padding:16px}.method-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:12px}.method-step{border:1px solid var(--line);border-radius:10px;padding:12px;background:#fff}.method-step span{display:grid;place-items:center;width:27px;height:27px;border-radius:50%;background:var(--primary);color:#fff;font-size:12px;font-weight:900;margin-bottom:7px}.method-step strong{display:block;color:var(--primary-dark);margin-bottom:4px}.method-step p{font-size:13px;color:var(--muted);margin:0}
.timeline{position:relative;margin:17px 0;padding-left:23px;border-left:3px solid #d7bca3}.timeline-item{position:relative;margin:0 0 15px;padding:0 0 0 10px}.timeline-item::before{content:"";position:absolute;left:-20px;top:7px;width:10px;height:10px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 4px var(--primary-soft)}.timeline-item strong{display:block;color:var(--primary-dark)}
.quick-question{border:1px solid var(--line);border-left:5px solid var(--primary);padding:14px;background:#fff}.quick-question>strong{display:block;color:var(--primary-dark);margin-bottom:4px}
.choice-row{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}.choice-row button{border:1px solid #d6c1ae;background:#fff;border-radius:9px;padding:9px 12px;color:var(--text);font-weight:800;cursor:pointer}.choice-row button:hover{background:var(--primary-soft)}.choice-row button.is-correct{background:var(--ok-bg);border-color:var(--ok);color:var(--ok)}.choice-row button.is-wrong{background:var(--danger-bg);border-color:var(--danger);color:var(--danger)}
.choice-feedback{min-height:0;font-size:13px}.choice-feedback.is-correct{color:var(--ok)}.choice-feedback.is-wrong{color:var(--danger)}
.chapter-checkpoint{margin-top:28px;padding-top:18px;border-top:2px solid var(--line)}.challenge-box{background:#f7f3ff;border:1px solid #ddd4ff;border-left:5px solid #6d4aff;padding:15px}.challenge-box details{margin-top:10px}.challenge-box summary{cursor:pointer;font-weight:800;color:#5d42bd}
.curriculum-box{margin-top:20px;border:1px dashed #bfae9e;border-radius:10px;padding:12px 14px;background:#fffcf8;color:var(--muted)}.curriculum-box summary{cursor:pointer;color:var(--primary-dark);font-weight:800}
.hist-chip{display:inline-block;padding:4px 8px;border-radius:999px;background:var(--primary-soft);color:var(--primary-dark);font-size:12px;font-weight:900;margin:2px}
@media(max-width:1050px){.four-col,.method-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:720px){.two-col,.three-col,.four-col,.comparison-grid,.evidence-grid,.method-grid{grid-template-columns:1fr}.choice-row{display:grid;grid-template-columns:1fr}.choice-row button{text-align:left}}