:root{--paper:#f6f5ef;--panel:#fdfcf8;--ink:#2a302b;--muted:#73796e;--line:#dddEd4;--accent:#a64e36;--green:#49654c}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:14px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,select,textarea{font:inherit;color:inherit}button,select{cursor:pointer}button:focus-visible,a:focus-visible,select:focus-visible,summary:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:3px}button:disabled{cursor:default;opacity:.5}main{max-width:1120px;margin:auto;padding:38px 40px 65px}.course-tabs{display:flex;gap:38px;border-bottom:1px solid var(--line);margin-bottom:26px}.course-tabs button{border:0;border-bottom:2px solid transparent;background:transparent;padding:0 0 18px;font-size:19px;font-weight:500;color:var(--muted);margin-bottom:-1px}.course-tabs button.active{border-color:var(--ink);color:var(--ink)}.filters{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.segmented{display:flex;padding:3px;border:1px solid var(--line);border-radius:4px;background:#eeeee6}.segmented button{border:0;background:transparent;padding:7px 14px;font-size:12px;border-radius:2px;color:var(--muted)}.segmented button.active{background:var(--panel);color:var(--ink);box-shadow:0 1px 3px #0000000d}.filter{display:flex;align-items:center;gap:7px;font-size:11px;color:var(--muted)}select{border:1px solid var(--line);border-radius:4px;padding:9px 27px 9px 11px;background:var(--panel);font-size:12px;max-width:265px}.bank-count{font-size:12px;color:var(--muted);margin:24px 0 15px}.unit-group{border-top:1px solid var(--line)}.unit-group:last-of-type{border-bottom:1px solid var(--line)}summary{display:flex;gap:17px;align-items:center;cursor:pointer;list-style:none;padding:21px 3px}summary::-webkit-details-marker{display:none}summary:after{content:'+';font-size:20px;color:var(--muted);margin-left:5px}.unit-group[open]>summary:after{content:'−'}.unit-index{font:12px ui-monospace,monospace;color:var(--accent);width:52px;flex-shrink:0}.unit-name{font-size:16px;font-weight:500;line-height:1.4}.unit-count{margin-left:auto;font-size:11px;color:var(--muted);white-space:nowrap}.questions{margin:0 0 20px;background:var(--panel);border:1px solid var(--line);border-radius:4px;overflow:hidden}.question-row{display:grid;grid-template-columns:48px 81px minmax(0,1fr) 65px;gap:17px;align-items:center;padding:16px 20px;border-bottom:1px solid #e9e9e1}.question-row:last-child{border-bottom:0}.question-row:hover{background:#f1f3ea}.kind{font-size:10px;letter-spacing:.6px;color:var(--muted)}.difficulty{font-size:10px;color:var(--green);display:inline-flex;align-items:center;gap:7px}.difficulty:before{content:'';width:5px;height:5px;border-radius:50%;background:currentColor}.difficulty.level-1{color:#907139}.difficulty.level-2{color:#a15b46}.question-copy{min-width:0}.question-title{display:block;font-size:13px;line-height:1.6;font-weight:400;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.source{font-size:10px;color:var(--muted);margin-top:4px}.source .pdf{font-size:9px;border:1px solid #d9dcd0;border-radius:2px;padding:1px 4px;margin-left:5px}.text-button{border:0;background:transparent;font-size:12px;padding:7px 2px;text-align:right}.text-button span{margin-left:7px;color:var(--accent)}.notice{font-size:11px;line-height:1.7;color:var(--muted);margin:20px 0 0}.empty{padding:45px 20px;border:1px solid var(--line);text-align:center;color:var(--muted);margin-top:20px}.primary,.secondary{display:inline-block;text-decoration:none;border-radius:3px;padding:11px 17px;font-size:12px;line-height:1.5;text-align:center}.primary{background:var(--ink);color:var(--panel);border:1px solid var(--ink)}.secondary{border:1px solid var(--line);background:var(--panel);color:var(--ink)}dialog{border:1px solid var(--line);background:var(--paper);color:var(--ink);padding:0;width:min(780px,95vw);max-height:90vh;border-radius:5px;box-shadow:0 24px 90px #20282033}dialog::backdrop{background:#20282077;backdrop-filter:blur(2px)}.exercise-head{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:18px 26px;border-bottom:1px solid var(--line);font-size:11px;color:var(--muted)}.icon-button{background:none;border:0;font-size:23px;padding:0 7px;line-height:1.3}.exercise-body{padding:27px}.question-meta{display:flex;gap:12px;align-items:center;font-size:10px;letter-spacing:.8px;color:var(--muted)}.question{font:20px/1.7 Georgia,serif;margin:22px 0}.option{display:flex;align-items:center;gap:15px;width:100%;text-align:left;padding:15px;border:1px solid var(--line);background:var(--panel);margin:10px 0;border-radius:3px;font-size:14px}.option b{font-size:11px;border:1px solid var(--line);border-radius:50%;width:25px;height:25px;display:grid;place-items:center;flex-shrink:0}.option.selected{border-color:var(--ink);background:#e9ece3}.option.correct{border-color:#53765d;background:#e4ede1}.option.wrong{border-color:#ac614a;background:#f5e8e0}.option:disabled{opacity:1}.actions{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:25px}.feedback{background:#e9eddf;padding:19px;margin-top:24px;line-height:1.8;font-size:13px}.feedback h3{margin:0 0 9px;font-size:14px}.feedback p{white-space:pre-wrap;margin:8px 0}.frq-part{line-height:1.7;margin-top:18px}textarea{width:100%;margin-top:10px;min-height:110px;border:1px solid var(--line);border-radius:3px;background:var(--panel);padding:14px;font-size:14px;line-height:1.7;resize:vertical}label.rubric{display:block;margin:13px 0;cursor:pointer}input[type=checkbox]{accent-color:var(--green);margin-right:8px}.muted{font-size:12px;color:var(--muted);line-height:1.7}.external-links{display:flex;gap:10px;flex-wrap:wrap;margin:22px 0}.external-notes{display:block;font-size:12px;margin-top:25px}.completed{text-align:center;padding:45px 20px}.completed h2{font:24px Georgia,serif;font-weight:400}.question-link{color:var(--muted);font-size:11px;line-height:1.8}.exercise-head .source{margin:0}.mobile-label{display:none}@media(max-width:750px){main{padding:24px 18px 40px}.course-tabs{gap:25px;margin-bottom:22px}.course-tabs button{font-size:16px;padding-bottom:15px}.filters{gap:9px}.segmented button{padding:7px 12px}.filter{flex:1;min-width:140px}.filter select{width:100%;max-width:100%}.filter label{display:none}.bank-count{margin:20px 0 10px}summary{gap:9px;padding:19px 1px}.unit-index{width:40px;font-size:10px}.unit-name{font-size:14px}.unit-count{font-size:10px}.question-row{grid-template-columns:34px 59px minmax(0,1fr);gap:8px;padding:14px 12px}.question-copy{grid-column:1/4;grid-row:2}.question-row .text-button{grid-column:3;grid-row:1}.kind,.difficulty{font-size:9px}.question-title{font-size:12px;-webkit-line-clamp:3}.source{font-size:9px}.question{font-size:18px}.exercise-head{padding:15px 18px}.exercise-body{padding:20px}.actions{flex-wrap:wrap}.notice{font-size:10px}.option{font-size:13px}}

/* Math content wraps as prose, with individual long equations scrollable. */
.question-title{display:block;overflow:visible;-webkit-line-clamp:unset;line-height:1.9}
.math-inline{display:inline-block;vertical-align:middle;max-width:100%;overflow-x:auto;overflow-y:hidden;padding:3px 1px}
.math-inline .katex{font-size:1.08em;line-height:1.4}
.math-display{display:block;max-width:100%;overflow-x:auto;padding:8px 0}
.math-display .katex-display{margin:0;text-align:left}
.math-display .katex-display>.katex{text-align:left}
.option>span,.question-copy,.exercise-body,.frq-part{min-width:0}
.option>span{max-width:calc(100% - 40px)}
.math-preview:empty{display:none}
.math-preview{background:var(--panel);border:1px solid var(--line);border-top:0;padding:12px 15px;white-space:pre-wrap;line-height:1.9;overflow-wrap:anywhere;font-size:14px}
.math-error{font-family:ui-monospace,monospace;font-size:.9em}
@media(max-width:750px){.question-row{padding-top:12px;padding-bottom:12px}.question{line-height:1.9}}

.question-row{grid-template-columns:24px 42px 72px minmax(0,1fr) 65px;gap:12px}
.completion-cell{display:flex;align-items:center;justify-content:center;cursor:pointer}
.completion-cell input,.exercise-complete input{width:15px;height:15px;accent-color:var(--green);cursor:pointer}
.is-complete{box-shadow:inset 3px 0 #6f8667}
.done-label{color:var(--green)}
.exercise-complete{display:flex;gap:7px;align-items:center;margin-left:auto;font-size:11px;cursor:pointer;letter-spacing:0}
.pagination{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:11px;color:var(--muted);margin:12px 0 23px}
.pagination>div{display:flex;gap:8px}
.pagination .secondary{padding:7px 12px;font-size:11px}
.imported-title{font:19px/1.5 Georgia,serif;margin:22px 0}
.source-statement{font-size:15px;line-height:1.85;overflow-wrap:anywhere}
.source-statement p{margin:12px 0}
.source-statement math{font-size:1.1em;max-width:100%;overflow:auto}
.source-statement math[display=block]{display:block;margin:16px 0;overflow-x:auto}
.source-statement img{display:block;max-width:100%;height:auto;margin:18px auto}
.source-statement table{display:block;overflow-x:auto;border-collapse:collapse;font-size:13px}
.source-statement td,.source-statement th{border:1px solid var(--line);padding:8px 12px}
@media(max-width:750px){.question-row{grid-template-columns:20px 34px 59px minmax(0,1fr);gap:8px}.question-copy{grid-column:1/5;grid-row:2}.question-row .text-button{grid-column:4;grid-row:1}.source-statement{font-size:14px}.exercise-complete{font-size:10px}}
.source-preview{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden}
.source-preview p{margin:0}
.source-preview math{font-size:1.1em}