/* Shared only by the world-history article and quiz. */
.study-next{scroll-margin-top:80px}
.study-intro{margin:26px 0 12px;font-size:16px;font-weight:700;text-align:left}
.study-offer{--study-text:#30251d;--study-muted:#67584b;--study-surface:#fff;--study-border:#ddd3c4;--study-tint:#faf7f2;margin:18px 0;padding:20px;border:1px solid var(--study-border);border-radius:14px;background:var(--study-surface);color:var(--study-text);text-align:left;line-height:1.7;position:relative}
.study-theme-dark .study-offer{--study-text:#eeeae5;--study-muted:#bcb5ab;--study-surface:#18181c;--study-border:#3e3b35;--study-tint:#242229}
.study-offer .study-disclosure{margin:0 0 10px;color:var(--study-muted);font-size:11px;font-weight:400;letter-spacing:.04em}
.study-offer .study-heading{padding:0;margin:0 0 12px;border:0;font-size:17px;font-weight:700;line-height:1.6;color:var(--study-text)}
.study-offer .study-product{margin:0 0 6px;font-size:15px;font-weight:700;line-height:1.6;color:var(--study-text)}
.study-offer .study-description{margin:0 0 14px;font-size:14px;font-weight:400;line-height:1.85;color:var(--study-text)}
.study-offer .study-note{margin:12px 0 0;font-size:12px;font-weight:400;line-height:1.8;color:var(--study-muted)}
.study-book{display:flex;gap:16px;align-items:flex-start;margin:10px 0 16px}
.study-book>div{min-width:0}
.study-book .study-description{margin-bottom:0}
.study-cover{width:84px;height:120px;object-fit:contain;flex:none;border-radius:5px;background:var(--study-tint)}
.study-app-icon{width:64px;height:64px;flex:none;border-radius:14px}
.study-actions{display:flex;gap:10px;flex-wrap:wrap}
.study-offer a.study-button{display:inline-flex;align-items:center;justify-content:center;gap:4px;min-height:46px;max-width:100%;padding:11px 16px;border:1px solid transparent;border-radius:9px;color:#fff;font-size:14px;font-weight:700;line-height:1.5;text-align:center;text-decoration:none;text-underline-offset:3px;transition:filter .15s}
.study-offer a.study-button--amazon{background:#ffb341;color:#282015}
.study-offer a.study-button--rakuten{background:#b60000;color:#fff}
.study-offer a.study-button--yahoo{background:#0e5c98;color:#fff}
.study-offer a.study-button--outline{background:var(--study-tint);border-color:var(--study-border);color:var(--study-text)}
.study-offer a.study-button:hover{filter:brightness(.94);text-decoration:underline;color:inherit}
.study-offer a.study-button--amazon:hover{color:#282015}
.study-offer a.study-button--rakuten:hover,.study-offer a.study-button--yahoo:hover{color:#fff}
.study-offer a.study-button:focus-visible{outline:3px solid #b8860b;outline-offset:4px}
.study-pixel{position:absolute;bottom:0;right:0;width:1px;height:1px}
.study-jump{font-size:13px;text-align:center}
@media(max-width:480px){.study-offer{padding:16px}.study-book{gap:12px}.study-cover{width:64px;height:94px}.study-app-icon{width:48px;height:48px;border-radius:11px}.study-offer .study-heading{font-size:16px}.study-actions{display:grid;grid-template-columns:1fr}.study-offer a.study-button{width:100%}.study-offer .study-description{font-size:13px}}