/* Public reading pages inherit the existing MinwooMath palette and font. */
:root{font-family:-apple-system,BlinkMacSystemFont,'Pretendard','Segoe UI',sans-serif;color:#20304b;background:#f5f7fa;font-synthesis:none;-webkit-font-smoothing:antialiased;--learn-blue:#0066cc;--learn-line:#dce4ed;--learn-muted:#52627a}
*{box-sizing:border-box}body{margin:0;line-height:1.8;font-size:17px;word-break:keep-all;overflow-wrap:anywhere}a{color:var(--learn-blue);text-underline-offset:.22em;text-decoration-thickness:1px}a:hover{color:#004f9e}a:focus-visible,summary:focus-visible{outline:3px solid var(--learn-blue);outline-offset:4px;border-radius:3px}::selection{background:#dbeaff;color:#20304b}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.count-diagram:has(>.count-group:nth-child(2)){display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.learn-wrap{max-width:1100px;margin:auto;padding:0 24px}.learn-header{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;padding-block:24px;border-bottom:1px solid var(--learn-line)}.learn-brand{display:flex;align-items:center;gap:11px;color:#1d1d1f;font-weight:750;font-size:21px;text-decoration:none;white-space:nowrap}.learn-brand svg{width:42px;height:42px;background:#1d1d1f;color:white;padding:10px;border-radius:12px;flex:none}.learn-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.learn-actions a{font-size:15px;min-height:44px;display:inline-flex;align-items:center}.learn-actions .learn-button,.learn-button{display:inline-flex;justify-content:center;align-items:center;min-height:44px;padding:9px 16px;border-radius:10px;background:var(--learn-blue);color:white;font-size:16px;font-weight:650;text-decoration:none}.learn-button:hover{background:#005bb5;color:#fff}
.skip-link{position:absolute;left:16px;top:-100px;background:white;padding:10px;z-index:10}.skip-link:focus{top:8px}.learn-intro{max-width:72ch;margin:42px 0 30px}.learn-intro h1{font-size:clamp(28px,4vw,38px);line-height:1.35;letter-spacing:-.025em;color:#1d1d1f;text-wrap:balance;margin:0 0 18px}.learn-intro p{margin:12px 0}.learn-note{font-size:15px;color:var(--learn-muted)}.learn-breadcrumb{font-size:14px;margin:28px 0 0;color:var(--learn-muted)}.learn-breadcrumb a{display:inline-block;min-height:32px}.learn-breadcrumb span{margin-inline:8px}
.grade-group{background:white;border:1px solid var(--learn-line);border-radius:16px;padding:26px 28px;margin:24px 0 30px}.grade-group h2{font-size:24px;letter-spacing:-.02em;line-height:1.45;margin:0 0 16px}.grade-list{list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 32px;margin:0;padding:0}.grade-list li{border-top:1px solid var(--learn-line)}.grade-list a{display:block;padding:18px 0;text-decoration:none;min-height:78px}.grade-list strong{display:block;font-size:19px;line-height:1.55}.grade-list span{font-size:15px;color:var(--learn-muted);display:block;margin-top:3px}.grade-list a:hover strong{text-decoration:underline;text-underline-offset:.2em}.learn-about{max-width:72ch;margin:38px 0}.learn-about h2{font-size:24px;line-height:1.5;margin-bottom:14px}.learn-about p{margin:10px 0}
.lesson-layout{display:grid;grid-template-columns:210px minmax(0,1fr);align-items:start;gap:38px;margin-block:30px 44px}.lesson-toc{position:sticky;top:22px;font-size:15px}.lesson-toc h2{font-size:16px;margin:0 0 10px}.lesson-toc ol{padding-left:20px;margin:0}.lesson-toc a{display:inline-block;padding:6px 0;min-height:36px}.lesson-content{min-width:0;background:white;border:1px solid var(--learn-line);border-radius:16px;padding:30px 34px}.worked-example{padding-block:26px 32px;border-bottom:1px solid var(--learn-line);scroll-margin-top:20px}.worked-example:first-child{padding-top:0}.worked-example:last-of-type{border-bottom:0}.worked-example h2{font-size:24px;line-height:1.5;letter-spacing:-.02em;margin:0 0 16px;color:#1d1d1f}.example-question{font-size:19px;line-height:1.85;margin:0 0 20px}.worked-example h3{font-size:17px;margin:22px 0 10px}.worked-example ol{padding-left:25px;margin:0}.worked-example li{padding-left:3px;margin:10px 0}.example-answer{background:#edf4ff;color:#174e85;padding:14px 18px;border-radius:10px;margin:22px 0 14px;font-size:19px;font-weight:650}.example-tip{font-size:16px;margin:12px 0;color:var(--learn-muted)}.example-tip strong{color:#20304b}.lesson-next{margin-top:28px;padding-top:24px;border-top:1px solid var(--learn-line)}.lesson-next h2{font-size:23px;margin:0 0 12px}.lesson-next p{margin:12px 0 22px}.lesson-pager{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;margin-bottom:28px}.lesson-pager a{display:inline-block;padding:8px 0;min-height:44px;font-size:16px}.learn-footer{margin-top:38px;padding:26px 0 40px;border-top:1px solid var(--learn-line);font-size:14px;color:var(--learn-muted)}.learn-footer nav{display:flex;gap:18px;flex-wrap:wrap}.learn-footer a{display:inline-block;min-height:36px}.learn-footer p{margin:12px 0 0}.fraction{display:inline-grid;vertical-align:middle;text-align:center;line-height:1.2;font-size:.94em;margin-inline:.1em;min-width:1.2em}.fraction>span:first-child{padding:0 .2em .1em;border-bottom:1px solid currentColor}.fraction>span:last-child{padding:.1em .2em 0}.count-diagram{display:flex;gap:24px;flex-wrap:wrap;margin:16px 0 22px}.count-group{display:flex;gap:10px;flex-wrap:wrap;max-width:220px;align-content:flex-start;padding:15px;border:1px solid #b8c8da;border-radius:10px}.count-dot{display:block;width:24px;height:24px;border:2px solid #0066cc;border-radius:50%;background:#edf4ff;flex:none}
@media(max-width:760px){.lesson-layout{grid-template-columns:1fr;gap:22px}.lesson-toc{position:static;border-bottom:1px solid var(--learn-line);padding-bottom:20px}.lesson-toc ol{display:flex;gap:4px 26px;flex-wrap:wrap;padding-left:22px}.learn-intro{margin-top:30px}.learn-header{padding-block:18px}.lesson-content{padding:24px}.grade-group{padding:22px}}
@media(max-width:480px){.learn-wrap{padding-inline:max(16px,env(safe-area-inset-left)) max(16px,env(safe-area-inset-right))}.learn-actions{gap:12px}.learn-header{gap:10px}.learn-brand{font-size:20px}.learn-brand svg{width:38px;height:38px;padding:9px}.learn-actions a{font-size:14px}.learn-actions .learn-button{padding:8px 11px;font-size:14px}.grade-list{grid-template-columns:1fr}.grade-group{padding:20px}.lesson-content{padding:22px 18px}.worked-example h2{font-size:22px}.example-question{font-size:18px}.learn-intro p{font-size:17px}.learn-breadcrumb{margin-top:20px}.count-diagram{gap:14px}.learn-footer{padding-bottom:max(30px,env(safe-area-inset-bottom))}}
@media print{:root{background:white;color:#111}.learn-header,.lesson-toc,.lesson-pager,.learn-footer,.learn-actions,.skip-link,.lesson-next .learn-button{display:none}.learn-wrap{max-width:none;padding:0}.lesson-layout{display:block;margin:0}.lesson-content{border:0;padding:0}.learn-intro{margin:0 0 24px}.worked-example{break-inside:avoid}.example-answer{background:transparent;padding:0}.learn-note{color:#333}a{color:inherit}}