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/* Keep reading comfortable on phones and larger screens. */
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@media(max-width:720px){.unit-card p{font-size:11px}.unit-card-bottom{font-size:9px}.lesson-card p{font-size:11px}.lesson-card-bottom{font-size:9px}.topic-status{font-size:8px}.hero-description{font-size:13px}.daily-banner p{font-size:11px}.nav-link{font-size:13px}.steps li p,.answer-feedback .steps li p{font-size:14px}.history-body p{font-size:14px}.lesson-section>p{font-size:15px}.stat-card div>span{font-size:10px}.backup-actions .btn{font-size:11px}}

/* Longer, sourced stories remain optional inside the history accordion. */
.history-body .history-reading-time{display:flex;align-items:center;gap:7px;font-size:11px;color:#73744e;margin:8px 0 22px}.history-reading-time .icon{width:14px;height:14px}.history-section{margin:0 0 22px}.history-section h4,.history-section h3{font-size:14px;line-height:1.6;font-weight:650;color:#46583c;margin:0 0 8px}.history-section p{color:#646748;line-height:1.95;margin:0}.history-citations{white-space:normal}.history-citations a{display:inline-flex;align-items:center;justify-content:center;min-width:25px;min-height:26px;font-size:11px;color:#345d38;font-weight:650;text-decoration:underline;text-underline-offset:3px;border-radius:4px}.history-citations a:hover{background:#e6ecd7}.history-citations a:focus-visible{outline:2px solid #345d38;outline-offset:2px}.history-body .sources{display:grid;gap:5px}.history-body .sources a{font-size:11px;line-height:1.75;color:#536c40;margin-right:0}.history-body .sources>span{font-size:11px;color:#747354;margin-bottom:5px}
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/* Real situations progress from one simple decision to several connected steps. */
.real-life-section{margin:30px 0;padding:24px;border:1px solid #d4e1d0;border-radius:15px;background:#f0f5ec}.real-life-heading{display:flex;align-items:center;gap:12px;margin-bottom:13px}.real-life-heading>span{display:grid;place-items:center;width:34px;height:34px;flex-shrink:0;border-radius:10px;background:#e0ebd6;color:#527044}.real-life-heading h2{font-size:20px;line-height:1.4;margin:0;color:#294e36}.real-life-intro{font-size:14px;line-height:1.85;color:#556b4d;margin:0 0 18px}.application-order{font-size:11px;line-height:1.7;color:#6f805f;margin:0 0 17px}.application-examples{display:grid;gap:17px}.application-card{background:#fff;border:1px solid #dce5d6;border-radius:12px;padding:20px}.application-card-heading{display:flex;align-items:center;gap:12px;margin-bottom:12px}.application-number{width:31px;height:31px;border-radius:50%;background:#e8f0df;color:#52733b;display:grid;place-items:center;flex-shrink:0;font-weight:650;font-size:13px}.application-level{font-size:9px;letter-spacing:.08em;text-transform:uppercase;color:#6f8759;margin:0 0 4px;line-height:1.5}.application-card h3{font-size:16px;line-height:1.5;margin:0;color:#294e36}.application-scenario{font-size:13px;line-height:1.85;color:#607158;margin:0 0 14px}.application-calculation{background:#f4f7ee;border-radius:9px;padding:13px 15px;margin:0 0 14px}.application-calculation>span{font-size:10px;color:#758363;display:block;margin-bottom:7px}.application-calculation p{font-size:15px;line-height:1.85;color:#315238;white-space:pre-line;overflow-wrap:anywhere;margin:0;font-variant-numeric:tabular-nums}.application-result{font-size:12px;line-height:1.85;margin:0;color:#59704c}.application-result strong{font-weight:650;color:#3c5a31}.practice-purpose{max-width:850px;margin:24px auto}.application-details summary{display:flex;align-items:center;justify-content:space-between;gap:12px;list-style:none;padding:13px 0;border-top:1px solid #d7e1ce;font-size:13px;font-weight:600;color:#3f6136;cursor:pointer}.application-details summary::-webkit-details-marker{display:none}.application-details summary>.icon{width:18px;height:18px;flex-shrink:0}.application-details[open] summary{margin-bottom:10px}.application-details .application-order{margin-bottom:14px}
@media(max-width:600px){.real-life-section{padding:18px 15px}.real-life-heading h2{font-size:19px}.application-card{padding:17px 14px}.application-scenario{font-size:14px}.application-result{font-size:13px}.application-calculation p{font-size:14px}.application-order{font-size:12px}}

.history-list-title{margin:0}.history-section h3{font-family:inherit}