._classroom_rtu7s_1{--ink:#1d302c;--muted:#76847d;--green:#24624e;--line:#e2e6df;--paper:#fff;--wash:#f5f6f1;background:var(--wash);min-height:100vh;color:var(--ink);letter-spacing:-.025em;font-family:Arial,Pretendard,Noto Sans KR,sans-serif;line-height:1.7}._classroom_rtu7s_1 *{box-sizing:border-box}._classroom_rtu7s_1 :where(section){padding:0}._classroom_rtu7s_1 button,._classroom_rtu7s_1 input,._classroom_rtu7s_1 textarea{font:inherit}._classroom_rtu7s_1 button,._classroom_rtu7s_1 a,._classroom_rtu7s_1 summary{-webkit-tap-highlight-color:transparent}._classroom_rtu7s_1 button{cursor:pointer}._classroom_rtu7s_1 button:disabled{cursor:default;opacity:.45}._classroom_rtu7s_1 a{color:inherit;text-decoration:none}._classroom_rtu7s_1 button:focus-visible,._classroom_rtu7s_1 a:focus-visible,._classroom_rtu7s_1 summary:focus-visible,._classroom_rtu7s_1 [tabindex]:focus-visible{outline-offset:4px;outline:3px solid #83ac98}._classroom_rtu7s_1 u{text-underline-offset:5px;text-decoration-color:#47705e;text-decoration-thickness:1.5px}._topbar_rtu7s_1{border-bottom:1px solid var(--line);background:#fff;justify-content:space-between;align-items:center;height:64px;padding:0 max(28px,50vw - 660px);display:flex}._brand_rtu7s_1{letter-spacing:-.8px;align-items:center;gap:10px;font-size:16px;font-weight:800;display:flex}._brand_rtu7s_1>span:last-child>span{letter-spacing:1px;color:var(--green);margin-left:4px;font-size:10px}._brandMark_rtu7s_1{background:var(--green);color:#fff;letter-spacing:-2px;border-radius:3px;place-items:center;width:27px;height:27px;font-family:Georgia,serif;font-size:20px;display:grid}._topbar_rtu7s_1 nav{color:#617068;gap:24px;font-size:12px;display:flex}._topbar_rtu7s_1 nav a:hover{color:var(--green)}._shell_rtu7s_1{max-width:1280px;margin:auto;padding:0 28px}._bookTitle_rtu7s_1{justify-content:space-between;align-items:center;padding:35px 0 30px;display:flex}._bookTitle_rtu7s_1 p{letter-spacing:1.8px;color:var(--muted);margin:0 0 4px;font-size:9px;font-weight:700}._bookTitle_rtu7s_1 h1{letter-spacing:-1.4px;margin:0;font-size:28px;font-weight:800;line-height:1.4}._bookTitle_rtu7s_1 h1 span{color:var(--green);margin-left:5px;font-weight:400;display:inline-block}._bookLabel_rtu7s_1{letter-spacing:1.4px;color:var(--muted);border-bottom:1px solid #b8c2b5;padding:6px 0;font-size:9px}._layout_rtu7s_1{grid-template-columns:228px minmax(0,1fr);align-items:start;gap:36px;display:grid}._sidebar_rtu7s_1{scrollbar-width:thin;max-height:calc(100vh - 48px);padding-bottom:25px;padding-right:13px;position:sticky;top:24px;overflow:auto}._indexHeading_rtu7s_1{justify-content:space-between;align-items:center;margin:0 0 20px;display:flex}._indexHeading_rtu7s_1>span{letter-spacing:2px;color:var(--muted);font-size:10px;font-weight:800}._indexHeading_rtu7s_1>b{font-size:13px;font-weight:650}._progress_rtu7s_1{border-bottom:1px solid var(--line);margin-bottom:15px;padding-bottom:19px}._progress_rtu7s_1>div{justify-content:space-between;align-items:baseline;gap:10px;display:flex}._progress_rtu7s_1>div>span{color:#69796f;font-size:11px}._progress_rtu7s_1 strong{font-size:19px;font-weight:600}._progress_rtu7s_1 small{color:var(--muted);font-size:11px;font-weight:400}._progress_rtu7s_1 progress{appearance:none;background:#e2e7de;border:none;border-radius:0;width:100%;height:4px;margin:11px 0;display:block}._progress_rtu7s_1 progress::-webkit-progress-bar{background:#e2e7de}._progress_rtu7s_1 progress::-webkit-progress-value{background:#45795f}._progress_rtu7s_1 progress::-moz-progress-bar{background:#45795f}._progress_rtu7s_1 p{color:var(--muted);margin:0;font-size:10px}._wrongButton_rtu7s_1{color:#3b5346;text-align:left;background:#eef1e7;border:1px solid #d6ded1;align-items:center;gap:10px;width:100%;margin-bottom:20px;padding:10px 13px;display:flex;font-size:12px!important}._wrongButton_rtu7s_1 b{text-align:center;background:#fff;border-radius:3px;min-width:24px;padding:0 5px;font-size:11px}._wrongButton_rtu7s_1>span{margin-left:auto}._wrongButton_rtu7s_1._selected_rtu7s_1{background:var(--green);color:#fff;border-color:var(--green)}._wrongButton_rtu7s_1._selected_rtu7s_1 b{color:var(--green)}._chapterList_rtu7s_1 details{border-top:1px solid var(--line)}._chapterList_rtu7s_1 summary{cursor:pointer;align-items:baseline;gap:10px;padding:13px 0;font-size:12px;font-weight:750;list-style:none;display:flex}._chapterList_rtu7s_1 summary::-webkit-details-marker{display:none}._chapterList_rtu7s_1 summary:after{content:"+";color:#9ba598;margin-left:auto;font-size:16px;font-weight:400}._chapterList_rtu7s_1 details[open]>summary:after{content:"−"}._chapterList_rtu7s_1 summary>span{color:#83917f;font-size:10px;font-weight:400}._chapterList_rtu7s_1 details>div{gap:2px;padding-bottom:12px;display:grid}._chapterList_rtu7s_1 button{text-align:left;color:#69766d;background:0 0;border:0;justify-content:space-between;align-items:baseline;gap:8px;padding:9px 10px;font-size:11px;line-height:1.6;display:flex}._chapterList_rtu7s_1 button small{color:#8b988d;min-width:12px;font-size:9px}._chapterList_rtu7s_1 button[aria-current=page]{color:#1b583e;background:#e3ebdf;border-left:2px solid #4d7d59;padding-left:8px;font-weight:750}._accountNote_rtu7s_1{color:#95a08f;margin:25px 0 0;font-size:10px;line-height:1.7}._study_rtu7s_1{background:var(--paper);border:1px solid #e0e4db;min-width:0;scroll-margin-top:20px;box-shadow:0 4px 20px #27302403}._lessonHeader_rtu7s_1{padding:35px 40px 0}._eyebrow_rtu7s_1{color:#4e7a5e;letter-spacing:1.7px;margin:0 0 9px;font-size:10px;font-weight:750}._lessonHeader_rtu7s_1 h2{letter-spacing:-1.3px;margin:0 0 9px;font-size:30px;font-weight:750;line-height:1.45}._lessonHeader_rtu7s_1>p:last-of-type{color:var(--muted);margin:0 0 27px;font-size:12px}._tabs_rtu7s_1{border-bottom:1px solid var(--line);gap:30px;display:flex}._tabs_rtu7s_1 button{color:#889085;white-space:nowrap;background:0 0;border:0;border-bottom:2px solid #0000;margin-bottom:-1px;padding:12px 0 13px;font-size:13px;font-weight:650}._tabs_rtu7s_1 button>span{margin-right:6px;font-size:10px;font-weight:500}._tabs_rtu7s_1 button small{margin-left:4px;font-size:10px;font-weight:400}._tabs_rtu7s_1 button[aria-selected=true]{color:var(--green);border-color:var(--green)}._reviewToolbar_rtu7s_1{border-bottom:1px solid var(--line);color:var(--muted);justify-content:space-between;align-items:center;gap:12px;padding:8px 0 15px;font-size:12px;display:flex}._reviewToolbar_rtu7s_1 b{color:var(--green);margin:0 3px}._tabPanel_rtu7s_1{padding:0 40px 34px}._tabPanel_rtu7s_1[hidden]{display:none}._conceptOverview_rtu7s_1{border-bottom:1px solid var(--line);align-items:baseline;gap:20px;padding:24px 0;display:flex}._conceptOverview_rtu7s_1>span{color:#99a18f;letter-spacing:1px;white-space:nowrap;font-size:9px}._conceptOverview_rtu7s_1 p{color:#7e8b79;margin:0;font-size:11px;line-height:1.8}._conceptBlock_rtu7s_1{padding:29px 0}._conceptBlock_rtu7s_1+._conceptBlock_rtu7s_1{border-top:1px solid #edf0e8}._conceptBlock_rtu7s_1>header{align-items:baseline;gap:13px;margin-bottom:14px;display:flex}._conceptBlock_rtu7s_1>header>span{color:#96ae8a;font-family:Georgia,serif;font-size:23px;font-weight:400;line-height:1}._conceptBlock_rtu7s_1 h3{letter-spacing:-.7px;margin:0;font-size:19px;font-weight:700;line-height:1.5}._conceptText_rtu7s_1{white-space:pre-line;color:#435348;word-break:keep-all;overflow-wrap:anywhere;margin:12px 0;font-size:14px;line-height:1.95}._conceptPoints_rtu7s_1{gap:10px;margin:14px 0 0;padding:0;list-style:none;display:grid}._conceptPoints_rtu7s_1 li{color:#435348;word-break:keep-all;overflow-wrap:anywhere;white-space:pre-line;padding-left:15px;font-size:14px;line-height:1.9;position:relative}._conceptPoints_rtu7s_1 li:before{content:"";background:#8ca382;border-radius:50%;width:4px;height:4px;position:absolute;top:11px;left:0}._block_structure_rtu7s_1{background:#edf2e9;margin:4px 0 24px;border:0!important;padding:24px 26px!important}._block_structure_rtu7s_1 h3{font-size:15px}._block_structure_rtu7s_1>header>span{font-size:18px}._block_structure_rtu7s_1 ._conceptText_rtu7s_1{color:#254331;letter-spacing:-.3px;font-size:18px;font-weight:600;line-height:1.9}._block_structure_rtu7s_1 ._conceptPoints_rtu7s_1 li{color:#38503b;font-size:15px}._block_tip_rtu7s_1{background:#faf7ec;margin:10px 0 20px;border:0!important;border-left:3px solid #b7ac72!important;padding:22px 25px!important}._block_tip_rtu7s_1 h3{font-size:15px}._block_tip_rtu7s_1>header>span{color:#aa9959;font-size:18px}._block_tip_rtu7s_1 ._conceptText_rtu7s_1,._block_tip_rtu7s_1 ._conceptPoints_rtu7s_1 li{color:#756645;font-size:13px}._tableScroll_rtu7s_1{border:1px solid var(--line);margin-top:18px;overflow-x:auto}._tableScroll_rtu7s_1 table{border-collapse:collapse;text-align:left;width:100%;font-size:13px;line-height:1.8}._tableScroll_rtu7s_1 th,._tableScroll_rtu7s_1 td{border-bottom:1px solid var(--line);border-right:1px solid var(--line);white-space:pre-line;min-width:110px;padding:14px 17px}._tableScroll_rtu7s_1 tr>:last-child{border-right:0}._tableScroll_rtu7s_1 tr:last-child>*{border-bottom:0}._tableScroll_rtu7s_1 thead th{color:#4c6450;background:#eef2ea;font-size:12px;font-weight:650}._tableScroll_rtu7s_1 tbody th{color:#2c4935;background:#fafbf7;font-weight:600}._tableScroll_rtu7s_1 td{color:#516052}._example_rtu7s_1{border-bottom:1px solid #edf0e8;gap:16px;padding:20px 0;display:flex}._example_rtu7s_1:last-child{border-bottom:0;padding-bottom:0}._example_rtu7s_1>span{color:#99aa8d;min-width:15px;font-size:10px;line-height:2.9}._example_rtu7s_1>div{min-width:0}._example_rtu7s_1 p[lang=en]{color:#254331;letter-spacing:0;white-space:pre-line;margin:0 0 5px;font-family:Georgia,Times New Roman,serif;font-size:22px;line-height:1.65}._exampleTranslation_rtu7s_1{color:#7e8a79;word-break:keep-all;overflow-wrap:anywhere;margin:0;font-size:13px;line-height:1.8}._exampleNote_rtu7s_1{color:#567755;margin:10px 0 0;font-size:11px;line-height:1.8}._chapterEnd_rtu7s_1{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:20px;margin-top:12px;padding-top:22px;display:flex}._chapterEnd_rtu7s_1 p{color:var(--muted);margin:0;font-size:12px}._primary_rtu7s_1{border:1px solid var(--green);background:var(--green);justify-content:center;align-items:center;gap:25px;padding:10px 18px;text-decoration:none;display:inline-flex;color:#fff!important;font-size:12px!important;font-weight:650!important}._primary_rtu7s_1:hover{background:#194d3b}._practiceIntro_rtu7s_1{justify-content:space-between;align-items:baseline;gap:20px;padding:21px 0 24px;display:flex}._practiceIntro_rtu7s_1 p{color:#596b5c;margin:0;font-size:12px;font-weight:600;line-height:1.8}._practiceIntro_rtu7s_1 p span{color:#87917f;font-size:11px;font-weight:400}._savedMark_rtu7s_1{white-space:nowrap;color:#8a9884;font-size:9px}._exerciseGroup_rtu7s_1{margin:6px 0 42px}._exerciseGroup_rtu7s_1:last-child{margin-bottom:0}._groupHeader_rtu7s_1{border-top:2px solid #36503a;align-items:center;gap:13px;padding:20px 0 8px;display:flex}._groupHeader_rtu7s_1>span{color:#6e8963;font-family:Georgia,serif;font-size:34px;font-weight:400;line-height:1}._groupHeader_rtu7s_1 p{letter-spacing:1.4px;color:#88977f;margin:0 0 4px;font-size:8px;font-weight:700}._groupHeader_rtu7s_1 h3{letter-spacing:-.6px;margin:0;font-size:18px;font-weight:750;line-height:1.5}._groupHeader_rtu7s_1>small{color:#95a18c;margin-left:auto;font-size:9px}._groupInstruction_rtu7s_1{color:#465947;white-space:pre-line;margin:7px 0 17px;font-size:13px;line-height:1.85}._vocabulary_rtu7s_1{background:#f3f5ee;align-items:baseline;gap:15px;margin:0 0 15px;padding:12px 15px;font-size:11px;line-height:1.8;display:flex}._vocabulary_rtu7s_1>strong{color:#8b9e7c;letter-spacing:1.5px;font-size:9px}._vocabulary_rtu7s_1 dl{flex-wrap:wrap;gap:5px 18px;margin:0;display:flex}._vocabulary_rtu7s_1 dl>div{gap:7px;display:flex}._vocabulary_rtu7s_1 dt{color:#547048;font-weight:650}._vocabulary_rtu7s_1 dd{color:#84907b;margin:0}._optionBox_rtu7s_1{border:1px solid #dce3d5;margin:14px 0 18px;padding:14px 17px;position:relative}._optionBox_rtu7s_1>strong{color:#768b68;margin-bottom:5px;font-size:10px;display:block}._optionBox_rtu7s_1 ul{white-space:pre-line;letter-spacing:0;flex-wrap:wrap;gap:6px 20px;margin:0;padding:0;font-size:13px;line-height:1.8;list-style:none;display:flex}._question_rtu7s_1{border-top:1px solid #e8ece3;grid-template-columns:36px minmax(0,1fr);gap:12px;padding:24px 0;display:grid}._questionNumber_rtu7s_1{color:#386446;font-variant-numeric:tabular-nums;font-size:15px;font-weight:750;line-height:1.8}._questionBody_rtu7s_1{min-width:0}._questionMeta_rtu7s_1{color:#8b9784;align-items:center;gap:9px;min-height:20px;font-size:9px;display:flex}._questionMeta_rtu7s_1>span{letter-spacing:.4px}._questionMeta_rtu7s_1>b{font-size:10px;font-weight:550}._correctBadge_rtu7s_1{color:#40825c}._wrongBadge_rtu7s_1{color:#b07443}._question_rtu7s_1 h4{color:#4c5c4c;white-space:pre-line;word-break:keep-all;overflow-wrap:anywhere;margin:5px 0 11px;font-size:13px;font-weight:600;line-height:1.85}._sentence_rtu7s_1{color:#293e2d;white-space:pre-wrap;letter-spacing:0;overflow-wrap:anywhere;margin:12px 0 18px;font-size:17px;line-height:1.95}._passage_rtu7s_1{background:#f8f9f5;border:1px solid #e6eadf;padding:17px 19px;font-size:15px;line-height:2}._choices_rtu7s_1{border:0;gap:5px;margin:15px 0 19px;padding:0;display:grid}._choices_rtu7s_1 label{cursor:pointer;color:#495947;letter-spacing:0;border:1px solid #0000;align-items:baseline;gap:9px;padding:7px 9px 7px 1px;font-size:14px;line-height:1.8;display:flex;position:relative}._choices_rtu7s_1 label>input{opacity:0;width:1px;height:1px;position:absolute}._choices_rtu7s_1 label:has(input:focus-visible){outline-offset:2px;outline:3px solid #87ad85}._choices_rtu7s_1 label._checked_rtu7s_1{background:#f0f5ea;border-color:#a9c2a3;padding-left:9px}._choiceNumber_rtu7s_1{color:#7c8c70;border:1px solid #bac5b3;border-radius:50%;flex-shrink:0;place-items:center;width:18px;height:18px;font-size:10px;line-height:1;display:inline-grid;transform:translateY(-1px)}._checked_rtu7s_1 ._choiceNumber_rtu7s_1{background:var(--green);color:#fff;border-color:var(--green)}._shortChoices_rtu7s_1{grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 15px}._answerFields_rtu7s_1{gap:12px;margin:17px 0 15px;display:grid}._multipleFields_rtu7s_1{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 22px}._answerField_rtu7s_1{align-items:baseline;gap:12px;min-width:0;display:flex}._answerField_rtu7s_1 label{color:#819274;white-space:normal;flex-shrink:0;max-width:110px;font-size:11px;line-height:1.7}._answerField_rtu7s_1 input,._answerField_rtu7s_1 textarea{color:#223a2c;letter-spacing:0;background:#fcfdf9;border:0;border-bottom:1px solid #a8b89c;border-radius:0;outline:none;width:100%;min-width:0;padding:8px 7px;font-size:16px;line-height:1.7}._answerField_rtu7s_1 textarea{resize:vertical;border:1px solid #d9e1d0;min-height:78px;padding:10px 12px}._answerField_rtu7s_1 input::placeholder,._answerField_rtu7s_1 textarea::placeholder{color:#b2bba9;font-size:12px}._answerField_rtu7s_1 input:focus,._answerField_rtu7s_1 textarea:focus{border-color:#49825c;box-shadow:0 2px #49825c}._questionActions_rtu7s_1{flex-wrap:wrap;align-items:center;gap:10px 18px;margin-top:16px;display:flex}._checkButton_rtu7s_1{color:#38613e;background:#fff;border:1px solid #486c4b;align-items:center;gap:16px;min-height:34px;padding:6px 11px;display:inline-flex;font-size:11px!important;font-weight:650!important}._checkButton_rtu7s_1:hover{background:#eef4e9}._textButton_rtu7s_1{color:#829277;background:0 0;border:0;padding:7px 0;font-weight:500;font-size:10px!important}._textButton_rtu7s_1:hover{color:#456547;text-underline-offset:4px;text-decoration:underline}._feedback_rtu7s_1{background:#f2f6ee;border-left:2px solid #86a876;margin:20px 0 0;padding:18px 21px;font-size:12px;line-height:1.9}._feedbackCorrect_rtu7s_1{background:#f0f6ef;border-color:#709768}._feedbackWrong_rtu7s_1{background:#fbf7ee;border-color:#c5ab74}._feedback_rtu7s_1>strong{font-size:13px;font-weight:700}._feedback_rtu7s_1 dl{margin:12px 0 16px}._feedback_rtu7s_1 dl>div{grid-template-columns:65px minmax(0,1fr);gap:8px;margin:5px 0;display:grid}._feedback_rtu7s_1 dt{color:#8a937e;font-size:10px}._feedback_rtu7s_1 dd{white-space:pre-wrap;overflow-wrap:anywhere;color:#445440;margin:0;font-size:13px}._feedback_rtu7s_1 details{border-top:1px solid #dbe3d088;padding-top:11px}._feedback_rtu7s_1 summary{cursor:pointer;font-size:11px;font-weight:700}._feedback_rtu7s_1 p{white-space:pre-line;word-break:keep-all;overflow-wrap:anywhere;margin:10px 0 0;font-size:12px}._feedback_rtu7s_1 ._translation_rtu7s_1{color:#7a886f;font-size:11px}._retryNote_rtu7s_1{color:#9a793d;font-size:11px!important}._saved_rtu7s_1{color:#9aa58d;margin:13px 0 0;font-size:9px}._error_rtu7s_1{color:#a84434;margin:12px 0;font-size:12px;line-height:1.8}._reviewNotice_rtu7s_1{color:#86734e;background:#faf4e7;border-left:2px solid #beac7c;padding:16px 19px;font-size:12px}._reviewNotice_rtu7s_1 p{white-space:pre-line;margin:5px 0 0;font-size:12px;line-height:1.8}._remediation_rtu7s_1{border-left:2px solid #bdd1ad;margin:0 0 20px 47px;padding:0 0 0 21px}._remediation_rtu7s_1>summary{cursor:pointer;align-items:baseline;gap:11px;padding:13px 0;font-size:12px;list-style:none;display:flex}._remediation_rtu7s_1>summary:after{content:"+";color:#688458;margin-left:auto;font-size:16px}._remediation_rtu7s_1[open]>summary:after{content:"−"}._remediation_rtu7s_1>summary>span{color:#7d976c;font-size:9px}._remediation_rtu7s_1>summary>b{color:#4d6d3f;font-size:12px}._remediation_rtu7s_1>summary>small{color:#99a88d;font-size:9px}._remediation_rtu7s_1 ._question_rtu7s_1{grid-template-columns:24px minmax(0,1fr);gap:10px}._remediation_rtu7s_1 ._questionNumber_rtu7s_1{color:#869e72;font-size:12px}._remediation_rtu7s_1 ._sentence_rtu7s_1{font-size:16px}._nextLesson_rtu7s_1{border:0;border-top:1px solid var(--line);text-align:left;color:#365336;background:#fff;align-items:center;gap:20px;width:calc(100% - 80px);margin:5px 40px 30px;padding:23px 0 0;display:flex}._nextLesson_rtu7s_1>span:first-child{color:#9aa58c;white-space:nowrap;font-size:10px}._nextLesson_rtu7s_1>b{font-size:13px;font-weight:600;line-height:1.7}._nextLesson_rtu7s_1>span:last-child{color:#7b9470;margin-left:auto}._adminDetails_rtu7s_1{color:#939c89;border-top:1px dashed #dce2d3;margin:0 40px 30px;padding:15px 0 0;font-size:11px}._adminDetails_rtu7s_1 summary{cursor:pointer}._adminDetails_rtu7s_1 p{white-space:pre-line;font-size:11px;line-height:1.9}._adminDetails_rtu7s_1 a{margin:10px 15px 0 0;text-decoration:underline;display:inline-block}._source_rtu7s_1{color:#a2a991;margin:5px 0;font-size:9px}._sourceImage_rtu7s_1{color:#7b8e6b;margin:15px 0;font-size:11px}._sourceImage_rtu7s_1 iframe{border:1px solid var(--line);width:100%;height:460px;margin-top:10px}._diagram_rtu7s_1{background:#fafbf7;border:1px solid #e2e8dc;max-width:100%;margin:15px 0 20px;padding:12px}._diagram_rtu7s_1 svg{width:100%;height:auto;max-height:420px;display:block}._empty_rtu7s_1{text-align:center;color:#8b9a7d;padding:45px 20px}._empty_rtu7s_1>span{color:#adc09f;font-family:Georgia,serif;font-size:32px;display:block}._empty_rtu7s_1 h3{color:#58734b;margin:10px 0;font-size:17px;font-weight:550}._empty_rtu7s_1 p{margin:10px 0;font-size:12px}._notice_rtu7s_1{border:1px solid var(--line);color:#6c7e63;background:#fff;min-height:150px;margin-bottom:70px;padding:42px;font-size:13px;line-height:1.9}._notice_rtu7s_1 h2{color:#314b31;font-size:22px;line-height:1.5}._notice_rtu7s_1 p{font-size:13px}._notice_rtu7s_1 ._primary_rtu7s_1{margin-top:15px}._loadingDot_rtu7s_1{background:#71905e;border-radius:50%;width:7px;height:7px;margin-right:10px;animation:1.2s ease-in-out infinite alternate _pulse_rtu7s_1;display:inline-block}._footer_rtu7s_1{color:#9ca591;background:0 0;border:0;justify-content:space-between;gap:20px;padding:35px 0 40px;font-size:10px;display:flex}._footer_rtu7s_1>b{font-weight:650}._skipLink_rtu7s_1{background:var(--green);z-index:100;padding:10px 20px;position:fixed;top:-80px;left:15px;color:#fff!important}._skipLink_rtu7s_1:focus{top:10px}._mobileIndexToggle_rtu7s_1{display:none}._srOnly_rtu7s_1{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@keyframes _pulse_rtu7s_1{to{opacity:.3}}@media (width<=1050px){._layout_rtu7s_1{grid-template-columns:195px minmax(0,1fr);gap:22px}._lessonHeader_rtu7s_1{padding:29px 28px 0}._tabPanel_rtu7s_1{padding:0 28px 28px}._nextLesson_rtu7s_1{width:calc(100% - 56px);margin:5px 28px 25px}._adminDetails_rtu7s_1{margin:0 28px 25px}._lessonHeader_rtu7s_1 h2{font-size:27px}._practiceIntro_rtu7s_1{display:block}._savedMark_rtu7s_1{margin-top:7px;display:block}._remediation_rtu7s_1>summary{flex-wrap:wrap;gap:4px 10px}._remediation_rtu7s_1>summary>small{display:none}}@media (width<=760px){._topbar_rtu7s_1{height:55px;padding:0 19px}._brand_rtu7s_1{font-size:14px}._brandMark_rtu7s_1{width:23px;height:23px;font-size:17px}._topbar_rtu7s_1 nav{gap:15px;font-size:10px}._shell_rtu7s_1{padding:0 17px}._bookTitle_rtu7s_1{padding:26px 0 23px}._bookTitle_rtu7s_1 h1{font-size:25px}._bookTitle_rtu7s_1 p{letter-spacing:1.3px;font-size:8px}._bookLabel_rtu7s_1{letter-spacing:.6px;font-size:8px}._layout_rtu7s_1{display:block}._mobileIndexToggle_rtu7s_1{color:#4c6345;background:#eef2e8;border:1px solid #d9e1d2;justify-content:space-between;width:100%;margin-bottom:13px;padding:11px 15px;display:flex;font-size:12px!important}._mobileIndexToggle_rtu7s_1>span{color:#839577;font-size:10px}._sidebar_rtu7s_1{background:#f0f3eb;border:1px solid #d9e1d2;border-top:0;max-height:55vh;margin:-14px 0 14px;padding:17px 16px;display:none;position:static;overflow:auto}._sidebarOpen_rtu7s_5{display:block}._indexHeading_rtu7s_1{margin-bottom:10px}._progress_rtu7s_1{padding-bottom:13px}._accountNote_rtu7s_1{display:none}._study_rtu7s_1{scroll-margin-top:15px}._lessonHeader_rtu7s_1{padding:25px 22px 0}._lessonHeader_rtu7s_1 h2{font-size:25px}._lessonHeader_rtu7s_1>p:last-of-type{margin-bottom:20px;font-size:11px}._eyebrow_rtu7s_1{font-size:9px}._tabs_rtu7s_1{gap:24px}._tabs_rtu7s_1 button{padding-bottom:12px;font-size:12px}._tabPanel_rtu7s_1{padding:0 22px 25px}._conceptOverview_rtu7s_1{gap:13px;padding:18px 0}._conceptOverview_rtu7s_1 p{font-size:10px}._conceptOverview_rtu7s_1>span{font-size:8px}._conceptBlock_rtu7s_1{padding:24px 0}._conceptBlock_rtu7s_1 h3{font-size:17px}._conceptBlock_rtu7s_1>header>span{font-size:21px}._conceptText_rtu7s_1,._conceptPoints_rtu7s_1 li{font-size:13px;line-height:1.95}._block_structure_rtu7s_1{padding:20px!important}._block_structure_rtu7s_1 ._conceptText_rtu7s_1{font-size:16px}._block_structure_rtu7s_1 ._conceptPoints_rtu7s_1 li{font-size:13px}._block_tip_rtu7s_1{padding:18px 20px!important}._example_rtu7s_1 p[lang=en]{font-size:20px;line-height:1.65}._exampleTranslation_rtu7s_1{font-size:12px}._example_rtu7s_1{gap:11px;padding:16px 0}._example_rtu7s_1>span{font-size:9px}._tableScroll_rtu7s_1 th,._tableScroll_rtu7s_1 td{min-width:95px;padding:12px;font-size:12px}._chapterEnd_rtu7s_1 p{font-size:11px}._primary_rtu7s_1{gap:16px;padding:9px 13px;font-size:11px!important}._groupHeader_rtu7s_1>span{font-size:30px}._groupHeader_rtu7s_1 h3{font-size:16px}._groupInstruction_rtu7s_1{font-size:12px}._vocabulary_rtu7s_1{padding:11px 12px;display:block}._vocabulary_rtu7s_1>strong{font-size:8px}._vocabulary_rtu7s_1 dl{gap:4px 14px;margin-top:5px;font-size:10px}._question_rtu7s_1{grid-template-columns:26px minmax(0,1fr);gap:10px;padding:21px 0}._questionNumber_rtu7s_1{font-size:14px}._question_rtu7s_1 h4{font-size:12px}._sentence_rtu7s_1{font-size:16px;line-height:1.9}._choices_rtu7s_1 label{font-size:13px}._shortChoices_rtu7s_1{gap:4px 10px}._questionActions_rtu7s_1{gap:7px 13px}._checkButton_rtu7s_1,._textButton_rtu7s_1{font-size:10px!important}._answerField_rtu7s_1{gap:9px}._answerField_rtu7s_1 label{max-width:80px;font-size:10px}._multipleFields_rtu7s_1{grid-template-columns:1fr;gap:11px}._multipleFields_rtu7s_1 ._answerField_rtu7s_1 label{min-width:65px}._answerField_rtu7s_1 input,._answerField_rtu7s_1 textarea{font-size:16px}._feedback_rtu7s_1{padding:15px 16px}._feedback_rtu7s_1 dl>div{grid-template-columns:58px minmax(0,1fr)}._feedback_rtu7s_1 dd{font-size:12px}._remediation_rtu7s_1{margin-left:35px;padding-left:14px}._remediation_rtu7s_1 ._question_rtu7s_1{grid-template-columns:22px minmax(0,1fr);gap:7px}._remediation_rtu7s_1 ._sentence_rtu7s_1{font-size:15px}._remediation_rtu7s_1>summary>b{font-size:11px}._optionBox_rtu7s_1{padding:12px 13px}._optionBox_rtu7s_1 ul{gap:5px 15px;font-size:12px}._nextLesson_rtu7s_1{gap:13px;width:calc(100% - 44px);margin:5px 22px 24px}._nextLesson_rtu7s_1>b{font-size:12px}._adminDetails_rtu7s_1{margin:0 22px 25px}._reviewToolbar_rtu7s_1,._reviewToolbar_rtu7s_1 ._textButton_rtu7s_1{display:block}._notice_rtu7s_1{padding:30px 25px}._notice_rtu7s_1 h2{font-size:19px}._footer_rtu7s_1{padding:27px 0;font-size:9px}._sourceImage_rtu7s_1 iframe{height:360px}}@media (width<=390px){._shell_rtu7s_1{padding:0 11px}._bookLabel_rtu7s_1{display:none}._lessonHeader_rtu7s_1{padding:22px 17px 0}._tabPanel_rtu7s_1{padding:0 17px 22px}._question_rtu7s_1{grid-template-columns:22px minmax(0,1fr);gap:8px}._shortChoices_rtu7s_1{grid-template-columns:1fr}._topbar_rtu7s_1 nav{gap:10px}._chapterEnd_rtu7s_1{align-items:start;gap:12px}._chapterEnd_rtu7s_1 p{max-width:135px}._remediation_rtu7s_1{margin-left:28px;padding-left:10px}._example_rtu7s_1 p[lang=en]{font-size:19px}}@media (prefers-reduced-motion:reduce){._classroom_rtu7s_1 *{scroll-behavior:auto!important;animation:none!important}}._answerField_rtu7s_1 select{color:#314b31;min-width:0;font:inherit;background:#fafbf7;border:1px solid #d6dfce;border-radius:3px;flex:1;padding:10px 12px;font-size:15px;line-height:1.5}._answerField_rtu7s_1 select:focus{outline-offset:2px;outline:2px solid #819b71}._insertion_rtu7s_17{border:0;min-width:0;margin:15px 0;padding:0}._insertion_rtu7s_17 legend{color:#64765a;font-size:12px}._insertion_rtu7s_17 legend b{color:#304d31;margin-left:12px;font-size:18px}._insertion_rtu7s_17>p{color:#7d8c71;margin:10px 0;font-size:11px}._insertionSentence_rtu7s_17{white-space:pre-wrap;overflow-wrap:anywhere;color:#304232;font-size:19px;line-height:2.8}._insertionSentence_rtu7s_17 button{vertical-align:baseline;color:#628052;min-width:27px;line-height:1.8;font:inherit;cursor:pointer;background:#f4f7ef;border:1px dashed #9caf90;border-radius:3px;margin:0 3px;padding:0 5px;font-size:14px}._insertionSentence_rtu7s_17 button:focus-visible{outline-offset:2px;outline:2px solid #47673c}._insertionSentence_rtu7s_17 ._insertionSelected_rtu7s_17{color:#304f2b;background:#dce8d4;border:1px solid #627f51;font-weight:650}._workedExample_rtu7s_19{background:#f7f9f3;border:1px solid #dce3d5;margin:15px 0 22px;padding:17px 20px}._workedExample_rtu7s_19>strong{color:#768b68;font-size:10px}._workedExample_rtu7s_19 p{white-space:pre-line;margin:8px 0 0;font-size:13px;line-height:1.9}._workedExample_rtu7s_19 p[lang=en]{color:#29492f;font-size:18px}._workedExample_rtu7s_19 b{color:#38613e;margin-left:20px;font-size:12px;display:inline-block}._classroom_rtu7s_1{--ink:#000}._classroom_rtu7s_1 ._conceptText_rtu7s_1,._classroom_rtu7s_1 ._conceptPoints_rtu7s_1 li,._classroom_rtu7s_1 ._groupInstruction_rtu7s_1,._classroom_rtu7s_1 ._question_rtu7s_1 h4,._classroom_rtu7s_1 ._workedExample_rtu7s_19 p{color:#000;font-size:16px;line-height:1.95}._classroom_rtu7s_1 ._conceptBlock_rtu7s_1 h3{color:#000;font-size:21px}._classroom_rtu7s_1 ._conceptOverview_rtu7s_1 p,._classroom_rtu7s_1 ._practiceIntro_rtu7s_1 p span,._classroom_rtu7s_1 ._insertion_rtu7s_17>p{color:#000;font-size:14px;line-height:1.9}._classroom_rtu7s_1 ._practiceIntro_rtu7s_1 p,._classroom_rtu7s_1 ._insertion_rtu7s_17 legend{color:#000;font-size:16px}._classroom_rtu7s_1 ._questionNumber_rtu7s_1,._classroom_rtu7s_1 ._remediation_rtu7s_1 ._questionNumber_rtu7s_1{color:#000}._classroom_rtu7s_1 ._questionMeta_rtu7s_1>span{color:#333;font-size:12px}._classroom_rtu7s_1 ._block_structure_rtu7s_1 ._conceptText_rtu7s_1{font-size:20px}._classroom_rtu7s_1 ._tableScroll_rtu7s_1 table{font-size:15px;line-height:1.85}._classroom_rtu7s_1 ._tableScroll_rtu7s_1 th,._classroom_rtu7s_1 ._tableScroll_rtu7s_1 td{color:#000}._classroom_rtu7s_1 ._tableScroll_rtu7s_1 thead th{font-size:14px}._classroom_rtu7s_1 ._example_rtu7s_1 p[lang=en]{color:#000;font-size:24px;line-height:1.8}._classroom_rtu7s_1 ._exampleTranslation_rtu7s_1,._classroom_rtu7s_1 ._exampleNote_rtu7s_1{color:#000;font-size:15px;line-height:1.9}._classroom_rtu7s_1 ._sentence_rtu7s_1,._classroom_rtu7s_1 ._remediation_rtu7s_1 ._sentence_rtu7s_1,._classroom_rtu7s_1 ._workedExample_rtu7s_19 p[lang=en]{color:#000;font-size:20px;line-height:1.95}._classroom_rtu7s_1 ._passage_rtu7s_1{font-size:18px;line-height:2}._classroom_rtu7s_1 ._choices_rtu7s_1 label{color:#000;font-size:17px;line-height:1.85}._classroom_rtu7s_1 ._optionBox_rtu7s_1 ul{color:#000;font-size:16px}._classroom_rtu7s_1 ._vocabulary_rtu7s_1{font-size:14px}._classroom_rtu7s_1 ._vocabulary_rtu7s_1 dt,._classroom_rtu7s_1 ._vocabulary_rtu7s_1 dd,._classroom_rtu7s_1 ._workedExample_rtu7s_19 b,._classroom_rtu7s_1 ._insertionSentence_rtu7s_17{color:#000}._classroom_rtu7s_1 ._workedExample_rtu7s_19 b{font-size:14px}._classroom_rtu7s_1 ._answerField_rtu7s_1 label{color:#000;font-size:13px}._classroom_rtu7s_1 ._answerField_rtu7s_1 input,._classroom_rtu7s_1 ._answerField_rtu7s_1 textarea,._classroom_rtu7s_1 ._answerField_rtu7s_1 select{color:#000;font-size:18px}._classroom_rtu7s_1 ._feedback_rtu7s_1,._classroom_rtu7s_1 ._feedback_rtu7s_1 p,._classroom_rtu7s_1 ._feedback_rtu7s_1 dd,._classroom_rtu7s_1 ._feedback_rtu7s_1 ._translation_rtu7s_1{color:#000;font-size:16px;line-height:1.9}._classroom_rtu7s_1 ._feedback_rtu7s_1>strong{color:#000;font-size:17px}._classroom_rtu7s_1 ._feedback_rtu7s_1 summary{color:#000;font-size:14px}._classroom_rtu7s_1 ._feedback_rtu7s_1 dt{color:#000;font-size:13px}._classroom_rtu7s_1 ._diagram_rtu7s_1 text{fill:#000}._chapterList_rtu7s_1 summary>div{min-width:0;line-height:1.7}._chapterList_rtu7s_1 summary>div>small{color:#526156;margin-top:3px;font-size:11px;font-weight:400;display:block}._chapterList_rtu7s_1 summary>span{white-space:nowrap;font-size:11px}._chapterList_rtu7s_1 button{font-size:12px}._bookResources_rtu7s_83{border:1px solid var(--line);background:#fff;flex-wrap:wrap;align-items:center;gap:10px 24px;margin:0 0 24px;padding:16px 20px;font-size:14px;display:flex}._bookResources_rtu7s_83>span{color:#54675a;font-size:12px;font-weight:700}._bookResources_rtu7s_83 a{color:#000;border-bottom:1px solid #8fa393;align-items:center;gap:16px;padding:5px 0;font-weight:650;display:inline-flex}._bookResources_rtu7s_83 a:hover{color:var(--green)}._lessonVideo_rtu7s_85{border-bottom:1px solid var(--line);padding:28px 0!important}._lessonVideo_rtu7s_85 header>span{letter-spacing:1.6px;color:var(--green);font-size:10px;font-weight:700}._lessonVideo_rtu7s_85 h3{color:#000;margin:7px 0 17px;font-size:21px}._lessonVideo_rtu7s_85 video{aspect-ratio:16/9;border:1px solid var(--line);background:#10251e;width:100%;display:block}@media (width<=760px){._classroom_rtu7s_1 ._conceptText_rtu7s_1,._classroom_rtu7s_1 ._conceptPoints_rtu7s_1 li,._classroom_rtu7s_1 ._groupInstruction_rtu7s_1,._classroom_rtu7s_1 ._question_rtu7s_1 h4{font-size:15px}._classroom_rtu7s_1 ._example_rtu7s_1 p[lang=en]{font-size:21px}._classroom_rtu7s_1 ._sentence_rtu7s_1,._classroom_rtu7s_1 ._remediation_rtu7s_1 ._sentence_rtu7s_1{font-size:18px}._classroom_rtu7s_1 ._passage_rtu7s_1{font-size:17px}._classroom_rtu7s_1 ._choices_rtu7s_1 label{font-size:16px}._classroom_rtu7s_1 ._tableScroll_rtu7s_1 table{font-size:14px}._bookResources_rtu7s_83{gap:8px 18px;margin-bottom:20px;padding:12px 15px}._lessonVideo_rtu7s_85 h3{font-size:18px}}