/* 두목넷 강의실 전용. 공통 헤더·상품·게시판과 분리합니다. */
.dm-classroom{background:#f5f7fb;color:#253046;padding:28px 0 44px;font-family:var(--bs-body-font-family,inherit)}
.dm-classroom .dm-classroom-container{max-width:1280px;padding:0 24px}
.dm-classroom .dm-classroom-header{display:flex;align-items:center;flex-wrap:wrap;gap:20px;justify-content:space-between;background:#fff;border:1px solid #e4e9f1;border-radius:12px;padding:24px 28px;margin-bottom:24px}
.dm-classroom .dm-classroom-identity{min-width:0;flex:1 1 420px}
.course.dm-classroom .dm-course-title-benefits .dm-course-benefits{justify-content:flex-start;gap:0;padding:0;margin:0 0 10px;background:none;border:0}
.course.dm-classroom .dm-course-title-benefits .dm-benefit-supported{color:#2455d6}
.course.dm-classroom .dm-course-title-benefits .dm-benefit-unavailable{color:#68758a}
.course.dm-classroom .dm-course-title-benefits .dm-benefit.btn{font-size:12px;line-height:1.5;padding:0}
.dm-classroom .dm-classroom-header h1{font-size:26px;line-height:1.45;font-weight:700;color:#102451;margin:0 0 8px;letter-spacing:-.025em;overflow-wrap:anywhere}
.dm-classroom .dm-classroom-meta{font-size:14px;line-height:1.7;color:#617087;margin:0}
.dm-classroom .dm-classroom-meta>span{padding:0 8px}
.dm-classroom .dm-classroom-tools{display:flex;flex-wrap:wrap;gap:10px}
.dm-classroom .btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;font-size:14px;line-height:1.5;min-height:42px;padding:9px 12px;margin:0;border-radius:8px;white-space:nowrap;box-shadow:none}
.dm-classroom .btn-outline-primary{color:#2455d6;border-color:#adc2f5;background:#fff}
.dm-classroom .btn-outline-primary:hover{background:#edf2ff;border-color:#2455d6;color:#1d45b1}
.dm-classroom .btn-primary{background:#2455d6;border-color:#2455d6;color:#fff}
.dm-classroom .dm-classroom-state{display:flex;align-items:center;justify-content:space-between;gap:16px;flex:1 1 100%;padding:14px 16px;background:#fff4d9;border-radius:8px;color:#6b5425;font-size:14px}
.dm-classroom .dm-classroom-layout{display:grid;grid-template-columns:236px minmax(0,1fr);gap:24px;align-items:start}
.dm-classroom .dm-classroom-sidebar{background:#eff3fa;border:1px solid #e4e9f1;border-radius:12px;padding:20px 12px}
.dm-classroom .dm-classroom-sidebar h2{font-size:15px;line-height:1.5;color:#172747;font-weight:600;margin:0 12px 14px}
.dm-classroom .dm-classroom-chapters{display:flex;flex-direction:column;gap:4px}
.dm-classroom .dm-classroom-chapters a{display:flex;gap:10px;align-items:flex-start;padding:12px 10px;border-radius:8px;color:#37465d;font-size:14px;text-decoration:none;overflow-wrap:anywhere}
.dm-classroom .dm-classroom-chapters a[aria-current=true]{background:#e0eaff;color:#1c50d6;font-weight:600}
.dm-classroom .dm-classroom-chapters a:hover{background:#e5ebf6}
.dm-classroom .dm-chapter-number{display:inline-flex;justify-content:center;align-items:center;flex:0 0 26px;min-height:26px;border-radius:50%;background:#e2e8f3;color:#34445b;font-size:13px}
.dm-classroom .dm-classroom-chapters a[aria-current=true] .dm-chapter-number{background:#2455d6;color:#fff}
.dm-classroom .dm-classroom-overall{padding:18px 14px;margin-top:24px;border-radius:9px;background:#fff}
.dm-classroom .dm-classroom-overall h2{margin:0 0 20px;font-size:14px}
.dm-classroom .dm-classroom-progress-label{display:flex;justify-content:space-between;font-size:14px;margin-bottom:8px;color:#2455d6}
.dm-classroom .progress{height:6px;border-radius:8px;background:#e2e7ef}
.dm-classroom .progress-bar{background:#2455d6}
.dm-classroom .dm-classroom-mobile-picker{display:none}
.dm-classroom .dm-classroom-content{min-width:0}
.dm-classroom .dm-classroom-panel{background:#fff;border:1px solid #e4e9f1;border-radius:12px;padding:24px 26px;margin-bottom:20px;scroll-margin-top:24px}
.dm-classroom .dm-classroom-panel[hidden]{display:none!important}
.dm-classroom .dm-classroom-panel-heading h2{font-size:21px;line-height:1.5;margin:0 0 18px;color:#102451;font-weight:700;overflow-wrap:anywhere}
.dm-classroom .dm-classroom-panel-heading h3{font-size:15px;line-height:1.5;margin:0 0 3px;color:#172747;font-weight:600}
.dm-classroom .dm-classroom-panel-heading p{font-size:13px;color:#617087;margin:0 0 14px}
.dm-classroom .dm-classroom-lesson{display:grid;grid-template-columns:32px minmax(0,1fr) 90px auto;gap:12px;align-items:center;min-height:88px;padding:16px 8px;border-top:1px solid #edf0f5;scroll-margin-top:30px}
.dm-classroom .dm-lesson-number{display:flex;justify-content:center;align-items:center;width:32px;height:32px;background:#f0f3f8;color:#52627a;border-radius:50%;font-size:12px}
.dm-classroom .dm-lesson-info{min-width:0}
.dm-classroom .dm-lesson-title{display:block;color:#253046;font-size:15px;line-height:1.6;font-weight:500;text-decoration:none;overflow-wrap:anywhere}
.dm-classroom a.dm-lesson-title:hover{color:#2455d6}
.dm-classroom .dm-lesson-meta{display:flex;flex-wrap:wrap;align-items:center;gap:4px 14px;list-style:none;padding:0;margin:6px 0 0;font-size:12px;color:#617087}
.dm-classroom .dm-lesson-meta a{color:#2455d6;display:inline-flex;align-items:center;min-height:26px;gap:4px;text-decoration:none}
.dm-classroom .dm-lesson-progress{font-size:12px;color:#617087}
.dm-classroom .dm-lesson-progress .progress{margin-top:7px;height:4px}
.dm-classroom .dm-lesson-actions{display:flex;align-items:center;gap:8px}
.dm-classroom .dm-lesson-play{min-width:100px;font-size:13px}
.dm-classroom .dm-classroom-empty{padding:28px 0;color:#617087;font-size:14px}
.dm-classroom a:focus-visible,.dm-classroom button:focus-visible,.dm-classroom select:focus-visible{outline:3px solid #2455d6;outline-offset:3px}
@media(max-width:1100px){.dm-classroom .dm-classroom-layout{grid-template-columns:204px minmax(0,1fr);gap:18px}.dm-classroom .dm-classroom-panel{padding:22px 18px}.dm-classroom .dm-classroom-lesson{grid-template-columns:28px minmax(0,1fr) auto;gap:10px}.dm-classroom .dm-lesson-progress{grid-column:2;grid-row:2}.dm-classroom .dm-lesson-actions{grid-column:3;grid-row:1 / span 2}.dm-classroom .dm-lesson-number{width:28px;height:28px}.dm-classroom .dm-lesson-progress .progress{max-width:100px}}
@media(max-width:767px){.dm-classroom{padding:18px 0 28px}.dm-classroom .dm-classroom-container{padding:0 16px}.dm-classroom .dm-classroom-header{padding:20px;margin-bottom:16px;gap:16px}.dm-classroom .dm-classroom-identity{flex-basis:100%}.dm-classroom .dm-classroom-header h1{font-size:22px}.dm-classroom .dm-classroom-meta{font-size:13px}.dm-classroom .dm-classroom-meta>span{padding:0 4px}.dm-classroom .dm-classroom-tools{width:100%;gap:8px}.dm-classroom .dm-classroom-tools .btn{flex:1;min-width:0;font-size:13px}.dm-classroom .btn{min-height:44px}.dm-classroom .dm-classroom-layout{grid-template-columns:1fr;gap:16px}.dm-classroom .dm-classroom-sidebar{display:flex;flex-direction:column;padding:16px;background:#fff}.dm-classroom .dm-classroom-sidebar>h2{display:none}.dm-classroom .dm-classroom-mobile-picker{display:none}.dm-classroom.dm-classroom-enhanced .dm-classroom-mobile-picker{display:block;order:2}.dm-classroom .dm-classroom-mobile-picker label{font-size:14px;color:#253046;font-weight:600;margin-bottom:8px}.dm-classroom .form-select{font-size:16px;min-height:46px}.dm-classroom.dm-classroom-enhanced .dm-classroom-chapters{display:none}.dm-classroom .dm-classroom-overall{order:1;margin:0 0 18px;padding:0}.dm-classroom .dm-classroom-overall h2{font-size:13px;margin-bottom:10px}.dm-classroom .dm-classroom-panel{padding:20px 14px}.dm-classroom .dm-classroom-panel-heading h2{font-size:19px;margin-bottom:14px}.dm-classroom .dm-classroom-lesson{grid-template-columns:minmax(0,1fr) auto;padding:14px 0;gap:4px 10px}.dm-classroom .dm-lesson-number{display:none}.dm-classroom .dm-lesson-info{grid-column:1;grid-row:1}.dm-classroom .dm-lesson-progress{grid-column:1;grid-row:2}.dm-classroom .dm-lesson-actions{grid-column:2;grid-row:1 / span 2;flex-wrap:wrap;max-width:108px;justify-content:flex-end}.dm-classroom .dm-lesson-title{font-size:14px}.dm-classroom .dm-lesson-play{min-width:88px;padding:8px;font-size:12px}.dm-classroom .dm-lesson-meta{gap:4px 10px}.dm-classroom .dm-lesson-meta a{min-height:32px}.dm-classroom .dm-classroom-state{flex-direction:column;align-items:flex-start;font-size:13px}.dm-classroom .dm-classroom-state .btn{align-self:flex-end}}

/* 강의자료·복습·재생을 같은 크기의 차시 작업 버튼으로 정돈합니다. */
.dm-classroom .dm-lesson-actions .btn{min-width:100px;min-height:42px;padding:9px 12px;font-size:13px;font-weight:500}
@media(max-width:1100px) and (min-width:768px){.dm-classroom .dm-classroom-lesson{grid-template-columns:28px minmax(0,1fr)}.dm-classroom .dm-lesson-info{grid-column:2;grid-row:1}.dm-classroom .dm-lesson-actions{grid-column:2;grid-row:3;justify-content:flex-end;flex-wrap:wrap}}
@media(max-width:767px){.dm-classroom .dm-lesson-info{grid-column:1 / -1}.dm-classroom .dm-lesson-actions{grid-column:1 / -1;grid-row:3;max-width:none;width:100%;justify-content:flex-end;gap:8px;margin-top:8px}.dm-classroom .dm-lesson-actions .btn{min-width:88px;min-height:44px;flex:1;padding:9px 8px;font-size:13px}.dm-classroom .dm-lesson-actions .r2-lecture-play{flex-shrink:0}}

/* 모바일에서는 재생을 주 작업으로 강조하고 자료·복습은 기존 테두리를 유지합니다. */
@media(max-width:767px){
 .dm-classroom .dm-lesson-actions .dm-lesson-play{background:#2455d6;border-color:#2455d6;color:#fff;font-weight:600}
 .dm-classroom .dm-lesson-actions .dm-lesson-play:hover,.dm-classroom .dm-lesson-actions .dm-lesson-play:active{background:#1d45b1;border-color:#1d45b1;color:#fff}
 .dm-classroom .dm-lesson-actions .dm-lesson-play:focus-visible{outline:3px solid #102451;outline-offset:3px}
}

/* 모바일 차시 버튼은 단독으로도 늘어나지 않는 동일 너비로 표시합니다. */
@media(max-width:767px){
 .dm-classroom .dm-lesson-actions .btn{flex:0 0 120px;width:120px;min-width:0;max-width:100%;min-height:44px}
 .dm-classroom .dm-lesson-actions{flex-wrap:wrap;justify-content:flex-end}
}

@media(max-width:767px){.dm-classroom .dm-classroom-sidebar{display:block!important;position:sticky;top:0;z-index:20;background:#edf3ff;border:2px solid #2451d6;border-radius:12px;padding:12px;margin-bottom:16px}.dm-classroom .dm-classroom-sidebar>h2{display:block!important;color:#17389f;font-size:20px;font-weight:800;margin:0 0 8px}.dm-classroom .dm-classroom-mobile-picker{display:block!important}.dm-classroom .dm-classroom-mobile-picker label{font-size:16px;font-weight:700;color:#17389f}.dm-classroom #dm-chapter-select{display:block;width:100%;min-height:50px;font-size:17px;border:2px solid #2451d6;background:#fff;color:#172b58}.dm-classroom .dm-classroom-chapters{display:none!important}}

/* Instructor-approved compact mobile chapter control, 20261103 */
.dm-classroom .dm-classroom-compact-progress{margin:0 0 12px;color:#526078;font-size:14px;line-height:24px}
@media(max-width:767px){
.dm-classroom .dm-classroom-sidebar{box-sizing:border-box;display:block!important;position:sticky;top:0;align-self:start;height:60px;min-height:60px;max-height:60px;padding:7px 10px;margin:0;border:1px solid #2451d6;border-radius:10px;background:#edf3ff;z-index:20}
.dm-classroom .dm-classroom-sidebar>h2{display:none!important}
.dm-classroom .dm-classroom-mobile-picker{display:flex!important;align-items:center;gap:8px;height:44px}
.dm-classroom .dm-classroom-mobile-picker label{flex:0 0 auto;margin:0;white-space:nowrap;font-size:14px;line-height:20px;color:#17389f;font-weight:700}
.dm-classroom #dm-chapter-select{box-sizing:border-box;flex:1;min-width:0;width:auto;height:44px;min-height:44px;padding:6px 30px 6px 8px;font-size:15px;line-height:22px;border:2px solid #2451d6;border-radius:7px;color:#172b58;background-color:#fff;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath d='m4 6 4 4 4-4' fill='none' stroke='%2317389f' stroke-width='2'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 8px center;background-size:16px;appearance:none}
}

/* 20261103 instructor mobile revision: one heading + gauge, then selector */
.dm-classroom .dm-chapter-topline{margin-bottom:12px}
.dm-classroom .dm-chapter-topline h2{margin:0 0 6px}
.dm-classroom .dm-chapter-gauge{display:flex;align-items:center;gap:6px;font-size:12px;line-height:20px;color:#526078;white-space:nowrap}
.dm-classroom .dm-chapter-gauge-track{display:block;width:48px;height:5px;background:#d2dcf1;border-radius:4px;overflow:hidden}
.dm-classroom .dm-chapter-gauge-track>span{display:block;height:100%;background:#2451d6}
@media(max-width:767px){
.dm-classroom .dm-classroom-sidebar{height:96px;min-height:96px;max-height:96px;padding:9px 10px}
.dm-classroom .dm-chapter-topline{display:flex;align-items:center;justify-content:space-between;gap:8px;height:24px;margin:0 0 8px}
.dm-classroom .dm-chapter-topline h2{display:block!important;font-size:15px;line-height:24px;margin:0;color:#17389f;font-weight:700;white-space:nowrap}
.dm-classroom .dm-classroom-mobile-picker{display:block!important;height:44px}
.dm-classroom #dm-chapter-select{width:100%;height:44px;min-height:44px}
}