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@media(prefers-reduced-motion:no-preference){.chapter-card,.problem-link,.option,.btn{transition:background-color .15s,border-color .15s,filter .15s}}
@media print{.sidebar,.topbar,.bottom-nav,.reader-toolbar,.reader-nav,footer,.quiz-map,#toast{display:none!important}.shell{margin:0}main,#main{padding:0;max-width:none}.reader,.card{border:0;padding:0}.prose{font-size:12pt;color:#000;line-height:1.6}.katex-display{overflow:visible}body{background:#fff;color:#000}details{break-inside:avoid}}

/* Match full practice cards and native fieldset styling. */
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.problem-title{font-size:calc(var(--reading-size) + 2px);line-height:1.8}

/* Institute identity: same emblem and wording as the original Isbot header. */
.topbar-tools{margin-left:auto;display:flex;align-items:center;gap:22px;flex-shrink:0}.header-institute{display:flex;align-items:center;gap:11px;flex-shrink:0;color:var(--ink);text-align:left;font-size:10px;line-height:1.45}.header-institute img{width:48px;height:48px;object-fit:contain;flex-shrink:0}.header-institute b{font-size:12px;font-weight:700}.header-institute img{background:#fffefa;border-radius:50%;padding:2px}@media(max-width:1050px){.topbar-tools>.offline{display:none}}@media(max-width:850px){.topbar{padding-left:18px;padding-right:18px}.topbar-tools{gap:0}.header-institute{font-size:8px;gap:8px}.header-institute b{font-size:10px}.header-institute img{width:40px;height:40px}.topbar #breadcrumb{display:none}}@media(max-width:380px){.topbar{padding-left:12px;padding-right:12px;gap:8px}.mobile-brand{font-size:18px;gap:7px}.mobile-brand img{width:32px;height:32px}.mobile-brand span>b{font-size:10px}.header-institute{font-size:7px;gap:6px}.header-institute b{font-size:9px}.header-institute img{width:34px;height:34px}}
/* Keep a 300-question map within reach while the question remains readable. */
.quiz-map .number-grid{max-height:min(52vh,480px);overflow-y:auto;scrollbar-gutter:stable;padding:3px}@media(max-width:850px){.quiz-map .number-grid{max-height:300px}}

/* Analysis content additions preserve the Isbot UNI reading system. */
.volume-tabs{margin-bottom:23px}.volume-tabs .btn.selected{border-color:var(--teal);background:var(--light)}
.chapter-note{margin-top:20px}.chapter-note textarea{min-height:150px}
.prose .definition,.prose .lemma,.prose .proposition,.prose .corollary,.prose .remark{padding:18px 20px;margin:23px 0;border:1px solid var(--line);border-radius:10px;background:var(--paper)}
.prose .proof,.prose .solution{margin:17px 0 25px}.prose .math{max-width:100%}
.brand span>b{letter-spacing:.015em}.sidebar-foot small{line-height:1.9}
.prose .theorem-title,.prose .env-title{font-weight:bold}.prose .proof-title{font-style:italic}
.prose .figure{margin:24px auto;text-align:center}.prose .figure img{max-width:100%;height:auto}
@media(max-width:620px){.volume-tabs{gap:8px}.volume-tabs .btn{padding:9px 11px;font-size:11px}.prose .definition,.prose .lemma,.prose .proposition,.prose .corollary,.prose .remark{padding:14px}}

/* Course selection shares the original Isbot UNI layout and reading settings. */
.sidebar-course{font-size:10px;color:var(--muted);margin-top:19px}.sidebar-course select{display:block;width:100%;font-size:11px;min-height:39px;padding:8px;margin-top:7px}.sidebar-course+.nav-links{margin-top:18px}
.course-strip{border-bottom:1px solid var(--line);padding:10px 42px;background:var(--card)}.course-strip label{display:flex;gap:14px;align-items:center;color:var(--muted);font-size:10px}.course-strip select{min-height:34px;padding:6px 10px;font-size:12px;max-width:290px;width:100%}
.course-catalog{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-bottom:26px}.course-choice{background:var(--card);border:1px solid var(--line);border-radius:12px;text-align:left;padding:18px 20px;color:var(--ink);min-width:0}.course-choice.selected{border-color:var(--teal);box-shadow:inset 3px 0 var(--teal);background:var(--light)}.course-choice .eyebrow{font-size:8px;margin-bottom:8px}.course-choice strong{display:block;font-size:17px;font-weight:650;line-height:1.4}.course-choice small{display:block;font-size:10px;color:var(--muted);margin-top:8px}
.prose .goalbox{background:var(--light);border-left:3px solid var(--teal);padding:17px 20px;border-radius:0 10px 10px 0;margin:22px 0}
@media(max-width:1150px){.course-strip{padding-left:29px;padding-right:29px}}@media(max-width:850px){.course-strip{padding-left:24px;padding-right:24px}.course-strip label{justify-content:space-between}}@media(max-width:620px){.course-strip{padding:9px 18px}.course-strip select{max-width:230px;font-size:11px}.course-strip label{font-size:9px;gap:9px}.course-catalog{gap:9px;margin-bottom:23px}.course-choice{padding:15px 13px}.course-choice strong{font-size:14px}.course-choice small{font-size:9px}.course-choice .eyebrow{font-size:7px;letter-spacing:.07em}.prose .goalbox{padding:14px}}

/* Four independent courses; appendix documents remain separate from main chapters. */
.course-catalog{grid-template-columns:repeat(4,minmax(0,1fr))}.course-choice strong{font-size:16px}.problem-caption{display:block;font-size:14px;line-height:1.5;margin:9px 0}
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/* Four real courses; all phone cards use the same two-column layout. */
@media(max-width:1150px){.course-catalog{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:620px){.course-catalog{grid-template-columns:repeat(2,minmax(0,1fr))}.course-choice:last-child{grid-column:auto}}