/* 몽글 물리 공용 스타일 — 교사(index.html)·학생(s.html) 모두 사용 */
* { box-sizing: border-box; font-family: 'Pretendard', -apple-system, 'Malgun Gothic', sans-serif; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }
button { font: inherit; color: inherit; }
.num { font-variant-numeric: tabular-nums; }
/* 🪟 모달 · 확인창 · 토스트 (몽글 클래스와 동일) */
.modal { display: flex; position: fixed; inset: 0; background-color: rgba(0, 0, 0, 0.7); justify-content: center; align-items: center; z-index: 300; }
.modal-content { background-color: var(--bg-container); width: 92%; max-width: 390px; border-radius: 16px; padding: 20px; border: 1px solid var(--border-color); max-height: 88vh; overflow-y: auto; scrollbar-width: none; color: var(--text-main); }
.modal-top-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; padding-bottom: 10px; border-bottom: 1px solid var(--border-color); }
.modal-top-header h3 { font-size: 14.5px; font-weight: 700; color: var(--text-main); }
.close-top-link { color: var(--text-muted); font-size: 11px; font-weight: 700; cursor: pointer; background-color: rgba(100, 116, 139, 0.12); padding: 5px 9px; border-radius: 6px; white-space: nowrap; border: none; }
.close-top-link i { font-size: 10px; margin-right: 3px; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 11.5px; font-weight: 600; color: var(--text-muted); margin-bottom: 6px; padding-left: 2px; }
.form-group input, .form-group select { width: 100%; padding: 11px; border-radius: 8px; border: 1px solid var(--border-color); background-color: var(--bg-input); color: var(--text-main); font-size: 13px; outline: none; }
.form-group input:focus, .form-group select:focus { border-color: var(--accent-color); }
.chip-pick { display: flex; flex-wrap: wrap; gap: 6px; }
.recognized-chip { padding: 9px 14px; border-radius: 20px; border: 1.5px solid var(--border-color); background-color: var(--bg-body); color: var(--text-muted); font-size: 12.5px; font-weight: 700; cursor: pointer; }
.recognized-chip.active { background: var(--accent-gradient); border-color: transparent; color: #FFFFFF; }
.modal-btns { display: flex; gap: 8px; margin-top: 16px; }
.m-btn { flex: 1; padding: 12px; border-radius: 8px; border: none; font-weight: 700; cursor: pointer; font-size: 14px; text-align: center; }
.m-btn.cancel { background-color: var(--border-color); color: var(--text-main); }
.m-btn.save { background: var(--accent-gradient); color: #fff; }
.m-btn:disabled { opacity: 0.55; }
.app-confirm-box { background-color: var(--bg-container); width: 85%; max-width: 320px; border-radius: 16px; border: 1px solid var(--border-color); padding: 22px; text-align: center; box-shadow: 0 10px 25px rgba(0,0,0,0.2); }
.app-confirm-text { font-size: 13.5px; color: var(--text-main); font-weight: 600; line-height: 1.6; margin-bottom: 20px; white-space: pre-line; }
.app-confirm-btns { display: flex; gap: 10px; }
.app-confirm-btn { flex: 1; padding: 11px; border-radius: 8px; border: none; font-size: 13px; font-weight: 700; cursor: pointer; }
.app-confirm-btn.yes { background-color: var(--danger-color); color: #fff; }
.app-confirm-btn.no { background-color: var(--border-color); color: var(--text-muted); }
.app-toast-bar { position: fixed; bottom: calc(92px + env(safe-area-inset-bottom)); left: 50%; transform: translateX(-50%) translateY(20px); background-color: #0F172A; color: #F1F5F9; padding: 12px 18px; border-radius: 20px; font-size: 12px; font-weight: 700; box-shadow: 0 6px 20px rgba(0,0,0,0.25); z-index: 10500; pointer-events: none; opacity: 0; transition: all 0.25s ease-out; max-width: 90%; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.app-toast-bar.show { opacity: 1; transform: translateX(-50%) translateY(0); }
html.stu .app-toast-bar { background-color: #2E2420; }
/* ───────────── 용수철 실험실 (교사·학생 공용) ───────────── */
.lab { display: flex; flex-direction: column; gap: 12px; }
.lgrid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
html.stu .lgrid { grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); align-items: start; }
@media (max-width: 900px) { html.stu .lgrid { grid-template-columns: minmax(0, 1fr); } }
@media (min-width: 901px) {
html.stu .lgrid .stage { position: sticky; top: 12px; }
html.stu .lgrid .steps { max-height: calc(100vh - var(--lab-top, 96px)); overflow-y: auto; overscroll-behavior: contain; }
html.stu .lgrid .steps .step-tabs { position: sticky; top: -14px; z-index: 3; background: var(--bg-card); margin: 0 -14px; padding: 8px 14px 8px; }
}
/* 조건 칩 → 그 부분만 바꾸는 작은 창 */
.cond-strip { position: absolute; left: 10px; right: 10px; top: 10px; z-index: 6; display: flex; flex-wrap: wrap; align-items: center; gap: 5px; pointer-events: none; }
.cond-strip .cond-chip { pointer-events: auto; }
.cond-chip { display: inline-flex; align-items: center; gap: 6px; padding: 6px 11px; border-radius: 999px; border: 1.5px solid var(--border-color); background: color-mix(in srgb, var(--bg-container) 92%, transparent); color: var(--text-main); font: inherit; font-size: 12.5px; font-weight: 800; cursor: pointer; font-variant-numeric: tabular-nums; box-shadow: 0 3px 10px rgba(0,0,0,0.06); white-space: nowrap; }
.cond-chip > i:first-child { color: var(--accent-color); font-size: 11px; }
.cond-chip .cc-caret { font-size: 9px; color: var(--text-muted); transition: transform .15s; }
.cond-chip:hover { border-color: var(--accent-color); }
.cond-chip.on { background: var(--accent-color); border-color: var(--accent-color); color: #fff; }
.cond-chip.on i { color: #fff !important; }
.cond-chip.on .cc-caret { transform: rotate(180deg); }
.show-btn { position: absolute; left: 10px; bottom: 10px; z-index: 6; }
.set-pop { position: absolute; z-index: 8; display: flex; flex-direction: column; background: var(--bg-container); border: 1.5px solid var(--border-color); border-radius: 18px; box-shadow: 0 14px 34px rgba(0,0,0,0.18); animation: popIn .15s ease-out; overflow: hidden; }
.set-pop[hidden] { display: none; }
.set-head { display: flex; align-items: center; justify-content: space-between; padding: 8px 6px 4px 14px; font-size: 13px; font-weight: 800; color: var(--text-muted); }
.set-body { overflow-y: auto; overscroll-behavior: contain; padding: 2px 12px 12px; touch-action: pan-y pinch-zoom; }
.set-body > div { display: flex; flex-direction: column; gap: 10px; }
.set-body > div[hidden] { display: none; }
.set-body .lcard-h > span { display: none !important; }
.set-body .lcard-h { justify-content: flex-start; }
.set-head span { font-size: 14px; color: var(--text-main); }
@keyframes popIn { from { transform: translateY(-6px); opacity: 0; } to { transform: none; opacity: 1; } }
/* 계산기 */
.calc-float { width: 236px; right: 10px; bottom: 10px; }
.calc-scr { background: var(--bg-body); border: 1px solid var(--border-color); border-radius: 12px; padding: 6px 10px; text-align: right; min-width: 0; }
.calc-exp { font-size: 12px; color: var(--text-muted); min-height: 16px; overflow-x: auto; white-space: nowrap; scrollbar-width: none; font-variant-numeric: tabular-nums; }
.calc-res { font-size: 22px; font-weight: 800; color: var(--text-main); overflow-x: auto; white-space: nowrap; scrollbar-width: none; font-variant-numeric: tabular-nums; }
.calc-keys { display: grid; grid-template-columns: repeat(5, 1fr); gap: 4px; }
.ck { padding: 9px 0; border-radius: 10px; border: 1px solid var(--border-color); background: var(--bg-card); color: var(--text-main); font: inherit; font-size: 13.5px; font-weight: 800; cursor: pointer; touch-action: manipulation; }
.ck.num { background: var(--bg-body); }
.ck.eq { background: var(--accent-color); border-color: var(--accent-color); color: #fff; }
.ck:active { transform: scale(0.95); }
.lpanel { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.lcard { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 16px; padding: 14px; display: flex; flex-direction: column; gap: 10px; min-width: 0; }
html.stu .lcard { border-width: 1.5px; border-radius: 18px; }
.lcard-h { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 13px; font-weight: 800; color: var(--text-main); }
.lcard-h > span:first-child { display: inline-flex; align-items: center; gap: 7px; }
.lcard-h > span:first-child i { color: var(--accent-color); font-size: 13px; width: 16px; text-align: center; }
.lcard-h b { font-size: 15px; font-weight: 800; color: var(--accent-color); font-variant-numeric: tabular-nums; }
.stage { padding: 0; overflow: hidden; gap: 0; }
.stage canvas { display: block; width: 100%; height: 460px; touch-action: pan-y pinch-zoom; cursor: default; background: var(--bg-card); }
html.stu .stage canvas { height: 540px; }
@media (max-width: 520px) { html.stu .stage canvas { height: 470px; } }
.stage-view { position: relative; }
.sw-float { position: absolute; right: 10px; bottom: 10px; z-index: 5; width: 214px; background: var(--bg-container); border: 1.5px solid var(--border-color); border-radius: 16px; padding: 8px 10px 10px; box-shadow: 0 10px 26px rgba(0,0,0,0.16); display: flex; flex-direction: column; gap: 6px; }
.sw-grip { display: flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 800; color: var(--text-muted); cursor: move; touch-action: none; user-select: none; -webkit-user-select: none; }
.sw-grip > span:first-child { flex: 1; display: inline-flex; align-items: center; gap: 5px; }
.sw-grip i { color: var(--accent-color); }
.sw-x { background: none; border: none; color: var(--text-muted); font-size: 13px; padding: 2px 4px; cursor: pointer; }
.sw-float .watch { font-size: 32px; text-align: center; }
.sw-btns { display: flex; gap: 5px; }
.sw-btns .pbtn { flex: 1; justify-content: center; padding: 8px 4px; }
.sw-tip { font-size: 10px; color: var(--text-muted); text-align: center; }
@media (hover: none) { .sw-tip { display: none; } }
.stage-bar { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; padding: 10px; border-top: 1px solid var(--border-color); background: var(--bg-card); }
.stage-bar .sp { flex: 1; }
.pull-btn.go { animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 5px var(--bg-accent-alpha); } }
.prow { display: flex; flex-wrap: wrap; gap: 6px; }
.pbtn { padding: 7px 12px; border-radius: 20px; border: 1.5px solid var(--border-color); background-color: var(--bg-body); color: var(--text-muted); font-size: 12.5px; font-weight: 700; cursor: pointer; white-space: nowrap; display: inline-flex; align-items: center; gap: 5px; transition: transform .1s; }
.pbtn:active { transform: scale(0.97); }
.pbtn.on, .pbtn.solid { background: var(--accent-gradient); border-color: transparent; color: #fff; }
.pbtn.sm { padding: 5px 10px; font-size: 11.5px; }
.spring-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
.spring-btn { justify-content: space-between; border-radius: 12px; padding: 8px 10px; font-size: 13px; font-weight: 800; }
.spring-btn .dots { font-size: 6px; letter-spacing: 1px; color: currentColor; opacity: 0.9; }
.spring-btn .dots i { font-style: normal; opacity: 0.25; }
.mini-toggle { display: flex; align-items: center; gap: 7px; font-size: 12px; font-weight: 700; color: var(--text-muted); cursor: pointer; }
.mini-toggle input, .sel input { accent-color: var(--accent-color); width: 15px; height: 15px; }
.mslider { display: flex; align-items: center; gap: 8px; touch-action: pan-y; user-select: none; -webkit-user-select: none; }
.mslider:focus-visible { outline: 2px solid var(--accent-color); outline-offset: 3px; border-radius: 10px; }
.ms-btn { width: 32px; height: 32px; flex: none; border-radius: 50%; border: 1.5px solid var(--border-color); background: var(--bg-container); color: var(--text-main); font-size: 17px; font-weight: 800; line-height: 1; cursor: pointer; touch-action: manipulation; }
.ms-btn:active { background: var(--bg-accent-alpha); border-color: var(--accent-color); }
.ms-track { position: relative; flex: 1; height: 6px; border-radius: 3px; background: var(--border-color); margin: 14px 4px; }
.ms-fill { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 3px; background: var(--accent-color); }
.ms-thumb { position: absolute; top: 50%; width: 26px; height: 26px; border-radius: 50%; background: #fff; border: 3px solid var(--accent-color); transform: translate(-50%, -50%); box-shadow: 0 2px 6px rgba(0,0,0,0.18); cursor: grab; transition: transform .1s; }
.mslider.active .ms-thumb { transform: translate(-50%, -50%) scale(1.18); cursor: grabbing; }
.tgrid { display: flex; flex-wrap: wrap; gap: 6px; }
.tchip { padding: 7px 11px; border-radius: 20px; border: 1.5px solid var(--border-color); background: var(--bg-container); color: var(--text-muted); font-size: 12px; font-weight: 700; cursor: pointer; display: inline-flex; align-items: center; gap: 5px; }
.tchip::before { content: ""; width: 8px; height: 8px; border-radius: 50%; border: 1.5px solid currentColor; }
.tchip.on { border-color: var(--accent-color); color: var(--accent-color); background: var(--bg-accent-alpha); }
.tchip.on::before { background: currentColor; }
.legend { display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: 11.5px; color: var(--text-muted); }
.legend i { display: inline-block; width: 12px; height: 4px; border-radius: 2px; margin-right: 4px; vertical-align: middle; }
.watch { font-size: 36px; font-weight: 800; font-variant-numeric: tabular-nums; line-height: 1.1; letter-spacing: -0.5px; color: var(--text-main); }
.count { font-size: 12.5px; font-weight: 800; color: var(--accent-color); background: var(--bg-accent-alpha); padding: 3px 9px; border-radius: 12px; }
.lhint { font-size: 11.5px; color: var(--text-muted); line-height: 1.55; }
.theory { background: var(--bg-accent-alpha); }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 5px 12px; font-size: 12.5px; }
.kv span:nth-child(odd) { color: var(--text-muted); }
.kv span:nth-child(even) { font-weight: 800; text-align: right; font-variant-numeric: tabular-nums; }
.tw { overflow-x: auto; scrollbar-width: thin; border: 1px solid var(--border-color); border-radius: 12px; background: var(--bg-container); }
.ptable { width: 100%; border-collapse: collapse; font-size: 12px; min-width: 480px; }
.ptable th { padding: 8px 6px; font-size: 10.5px; font-weight: 800; color: var(--text-muted); background: var(--bg-body); text-align: right; white-space: nowrap; }
.ptable td { padding: 8px 6px; border-top: 1px solid var(--border-color); text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; color: var(--text-main); }
.ptable th:first-child, .ptable td:first-child { text-align: left; padding-left: 10px; color: var(--text-muted); }
.ptable td.t { font-weight: 800; }
.ptable td b { color: var(--accent-color); }
.ptable td.e { text-align: center; color: var(--text-muted); padding: 18px 8px; white-space: normal; }
.ptable td input[type=number] { width: 48px; text-align: right; border: 1px solid var(--border-color); border-radius: 8px; background: var(--bg-input); color: var(--text-main); padding: 4px 6px; font-size: 12px; }
.ptable td input[type=checkbox] { accent-color: var(--accent-color); width: 16px; height: 16px; }
.icon-btn-plain { background: none; border: none; color: var(--text-muted); font-size: 14px; cursor: pointer; padding: 6px; display: inline-flex; align-items: center; justify-content: center; }
.icon-btn-plain:active { color: var(--danger-color); }
/* 단계 패널 */
.steps { gap: 12px; }
.step-tabs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; }
.step-tab { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 9px 2px; border-radius: 14px; border: 1.5px solid var(--border-color); background: var(--bg-body); color: var(--text-muted); font-size: 12px; font-weight: 800; cursor: pointer; line-height: 1.25; text-align: center; }
.step-tab span { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: var(--border-color); color: var(--text-main); font-size: 12px; }
.step-tab.on { border-color: var(--accent-color); color: var(--accent-color); background: var(--bg-accent-alpha); }
.step-tab.on span { background: var(--accent-color); color: #fff; }
[data-pane] { display: flex; flex-direction: column; gap: 10px; }
[data-pane][hidden] { display: none !important; }
.step-guide { font-size: 12px; color: var(--text-muted); line-height: 1.6; background: var(--bg-body); border-radius: 12px; padding: 10px 12px; }
.step-guide > b:first-child { display: block; color: var(--text-main); font-size: 13px; margin-bottom: 2px; }
.step-guide b { color: var(--text-main); }
.read-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.read-cond { flex: 1 1 100%; font-size: 12px; color: var(--text-muted); }
.read-cond b { color: var(--accent-color); }
.read-in { flex: 1; display: flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 700; color: var(--text-muted); min-width: 0; }
.read-in input, .kset input { width: 90px; min-width: 0; border: 1.5px solid var(--border-color); background: var(--bg-input); color: var(--text-main); border-radius: 10px; padding: 8px 10px; font-size: 15px; font-weight: 800; text-align: right; font-variant-numeric: tabular-nums; }
.read-in input:focus, .kset input:focus { outline: none; border-color: var(--accent-color); }
.read-in em, .kset em { font-style: normal; font-size: 12px; font-weight: 700; color: var(--text-muted); }
.kfit { display: flex; flex-direction: column; gap: 6px; }
.chart-wrap.small svg { height: 220px; }
html.stu .chart-wrap.small svg { height: 240px; }
.kset { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 13px; font-weight: 700; color: var(--text-main); background: var(--bg-accent-alpha); border-radius: 12px; padding: 10px 12px; }
.kset b { color: var(--accent-color); }
.ef-h { font-size: 12px; font-weight: 800; color: var(--text-main); }
.kgrid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 6px; margin-top: 6px; }
.kcell { display: flex; flex-direction: column; align-items: center; gap: 1px; padding: 8px 2px; border-radius: 12px; border: 1.5px dashed var(--border-color); background: var(--bg-container); color: var(--text-muted); cursor: pointer; }
.kcell span { font-size: 11px; font-weight: 800; }
.kcell b { font-size: 14px; font-weight: 800; color: var(--text-muted); font-variant-numeric: tabular-nums; }
.kcell small { font-size: 9px; }
.kcell.done { border-style: solid; border-color: var(--accent-color); }
.kcell.done b { color: var(--accent-color); }
.kcell.cur { box-shadow: 0 0 0 2px var(--bg-accent-alpha); background: var(--bg-accent-alpha); }
.exp-form { display: flex; flex-direction: column; gap: 8px; border: 1.5px solid var(--accent-color); border-radius: 14px; padding: 12px; background: var(--bg-container); }
.ef-ctrl { font-size: 12px; color: var(--text-main); line-height: 1.7; }
.tag-ctrl { display: inline-block; font-size: 10.5px; font-weight: 800; padding: 1px 7px; border-radius: 6px; background: var(--accent-color); color: #fff; }
.tag-ctrl.keep { background: var(--text-muted); }
.exp-card { border: 1.5px solid var(--border-color); border-radius: 14px; padding: 10px 12px; display: flex; flex-direction: column; gap: 7px; background: var(--bg-container); }
.exp-card.on { border-color: var(--accent-color); box-shadow: 0 0 0 3px var(--bg-accent-alpha); }
.exp-h { display: flex; align-items: center; gap: 8px; }
.exp-pick { flex: 1; text-align: left; background: none; border: none; font-size: 14px; font-weight: 800; color: var(--text-main); cursor: pointer; display: flex; align-items: center; gap: 7px; padding: 0; }
.exp-pick i { color: var(--accent-color); }
.exp-live { font-size: 10.5px; font-weight: 800; color: #fff; background: var(--accent-color); padding: 2px 8px; border-radius: 10px; }
.exp-meta { font-size: 11.5px; color: var(--text-muted); line-height: 1.7; }
.empty-mini { text-align: center; font-size: 12px; color: var(--text-muted); padding: 18px 8px; }
.axis-pick { display: grid; grid-template-columns: auto 1fr; gap: 6px 8px; align-items: center; margin-top: 8px; font-size: 11.5px; font-weight: 800; color: var(--text-muted); }
[data-ctl] > .prow:first-child { margin-bottom: 2px; }
.concl { display: flex; flex-direction: column; gap: 7px; margin-top: 8px; border-top: 1px dashed var(--border-color); padding-top: 10px; }
.concl-h { font-size: 12.5px; font-weight: 800; color: var(--text-main); }
.concl-ta { width: 100%; border: 1.5px solid var(--border-color); background: var(--bg-input); color: var(--text-main); border-radius: 12px; padding: 10px 12px; font-size: 13px; line-height: 1.55; resize: vertical; font-family: inherit; }
.concl-ta:focus { outline: none; border-color: var(--accent-color); }
.formula { margin-top: 8px; background: var(--bg-accent-alpha); border-radius: 12px; padding: 12px; text-align: center; font-size: 18px; font-weight: 800; color: var(--text-main); }
.formula b { color: var(--accent-color); }
.formula .lhint { font-size: 12px; font-weight: 600; margin-top: 4px; }
.sw-target { font-size: 10.5px; font-weight: 800; color: var(--accent-color); text-align: center; }
.spdot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 5px; vertical-align: 0; }
.sp-legend { display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: 11.5px; font-weight: 700; color: var(--text-muted); }
.sp-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 4px; vertical-align: -1px; }
.quiz { display: flex; flex-direction: column; gap: 10px; background: var(--bg-container); border: 1.5px solid var(--border-color); border-radius: 14px; padding: 12px; }
.quiz .ef-h i { color: #F59E0B; }
.qrow { display: flex; flex-direction: column; gap: 6px; }
.qtext { font-size: 13px; font-weight: 700; color: var(--text-main); line-height: 1.6; }
.qtext b { color: var(--text-muted); } .qtext b.ok { color: #10B981; } .qtext b.no { color: #E5484D; }
.qfb { font-size: 11.5px; font-weight: 700; } .qfb.ok { color: #10B981; } .qfb.no { color: #D97706; }
.hooke { background: var(--bg-accent-alpha); border-radius: 14px; padding: 14px; text-align: center; display: flex; flex-direction: column; gap: 6px; }
.hooke-f { font-size: 26px; font-weight: 800; color: var(--accent-color); letter-spacing: 1px; }
.kcalc { width: 78px; text-align: right; border: 1.5px solid var(--border-color); border-radius: 8px; background: var(--bg-input); color: var(--text-main); padding: 5px 7px; font-size: 13px; font-weight: 800; }
.kcalc:focus { outline: none; border-color: var(--accent-color); }
.okc { color: #10B981; font-size: 15px; } .noc { color: #E5484D; font-size: 15px; }
.ef-ctrls { display: flex; flex-direction: column; gap: 6px; }
.ef-field { display: flex; align-items: center; gap: 8px; font-size: 12.5px; font-weight: 700; color: var(--text-muted); flex-wrap: wrap; }
.ef-field > span { min-width: 92px; color: var(--text-main); }
.ef-field em { font-style: normal; font-size: 12px; }
.ef-in { border: 1.5px solid var(--border-color); background: var(--bg-input); color: var(--text-main); border-radius: 10px; padding: 7px 9px; font-size: 13.5px; font-weight: 700; width: 96px; font-family: inherit; }
.ef-in.wide { width: 100%; }
.ef-in:focus { outline: none; border-color: var(--accent-color); }
.exp-tools, .exp-plan { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.exp-plan > span { font-size: 11px; font-weight: 800; color: var(--text-muted); margin-right: 2px; }
.exp-warn { font-size: 11.5px; font-weight: 700; color: #D97706; }
/* 교사: 모둠 기록 요약 */
.kchip { display: inline-flex; align-items: center; gap: 3px; font-size: 11.5px; font-weight: 800; padding: 3px 9px; border-radius: 10px; background: rgba(16,185,129,0.14); color: #10B981; }
.kchip small { font-weight: 700; opacity: 0.8; }
.kchip.bad { background: rgba(245,158,11,0.15); color: #D97706; }
.sub-exp { margin-top: 8px; display: flex; flex-direction: column; gap: 4px; }
.sub-exp-h { font-size: 12.5px; color: var(--text-main); }
.sub-exp .rel { color: var(--accent-color); font-weight: 800; }
/* 그래프 */
.sub-toggle-container { display: flex; background-color: var(--bg-body); border-radius: 10px; padding: 3px; margin-bottom: 10px; border: 1px solid var(--border-color); }
.sub-toggle-btn { flex: 1; text-align: center; background: none; border: none; color: var(--text-muted); font-size: 12.5px; font-weight: 700; padding: 8px 0; border-radius: 8px; cursor: pointer; transition: all 0.15s; }
.sub-toggle-btn.active { background-color: var(--bg-card); color: var(--accent-color); box-shadow: 0 2px 5px rgba(0,0,0,0.06); }
.ctrls { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; margin-bottom: 6px; }
.sel { display: flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 700; color: var(--text-muted); min-width: 0; }
.sel select { border: 1.5px solid var(--border-color); background: var(--bg-input); color: var(--text-main); border-radius: 10px; padding: 6px 8px; font-size: 12px; font-weight: 600; max-width: 100%; min-width: 0; }
.chart-wrap { overflow-x: auto; }
.chart-wrap svg { display: block; width: 100%; min-width: 300px; height: 280px; }
html.stu .chart-wrap svg { height: 320px; }
.chart-wrap .grid { stroke: var(--border-color); }
.chart-wrap .axis { stroke: var(--text-muted); }
.chart-wrap text { fill: var(--text-muted); font-size: 10.5px; font-variant-numeric: tabular-nums; }
.chart-wrap .ttl { fill: var(--text-main); font-size: 11.5px; font-weight: 700; }
.chart-wrap .pt { fill: var(--pt); stroke: var(--bg-card); stroke-width: 2; }
.chart-wrap .fitline { stroke: var(--grav); stroke-width: 2; stroke-dasharray: 6 4; fill: none; }
.fit { font-size: 12.5px; line-height: 1.55; color: var(--text-main); }
.fit b { color: var(--accent-color); }
.board .fit { font-size: 18px; }
.board .chart-wrap text { font-size: 13px; }
.board .chart-wrap .ttl { font-size: 15px; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }
/* 🙋 질문 (학생·교사) */
.s-ask { position: relative; display: inline-flex; align-items: center; gap: 6px; padding: 8px 13px; border-radius: 999px; border: none; background: var(--accent-color); color: #fff; font: inherit; font-size: 13px; font-weight: 800; cursor: pointer; white-space: nowrap; box-shadow: 0 4px 12px rgba(0,0,0,0.12); }
.s-ask em { position: absolute; top: -6px; right: -6px; min-width: 18px; height: 18px; padding: 0 5px; border-radius: 9px; background: #E5484D; color: #fff; font-style: normal; font-size: 11px; line-height: 18px; text-align: center; }
.s-ask em[hidden] { display: none; }
.q-h { font-size: 12.5px; font-weight: 800; color: var(--text-muted); margin: 16px 0 8px; }
.q-item { border: 1px solid var(--border-color); border-radius: 12px; padding: 10px 12px; margin-bottom: 8px; background: var(--bg-card); }
.q-text, .q-body { font-size: 13.5px; font-weight: 600; color: var(--text-main); line-height: 1.5; white-space: pre-wrap; word-break: break-word; }
.q-meta { font-size: 11px; color: var(--text-muted); margin-top: 4px; }
.q-ans { margin-top: 8px; padding: 8px 10px; border-radius: 10px; background: color-mix(in srgb, var(--accent-color) 12%, transparent); font-size: 13px; line-height: 1.5; color: var(--text-main); white-space: pre-wrap; word-break: break-word; }
.q-ans b { color: var(--accent-color); margin-right: 4px; }
.q-empty { font-size: 12.5px; color: var(--text-muted); text-align: center; padding: 14px 0; }
.q-card { background: var(--bg-card); border: 1.5px solid var(--accent-color); border-radius: 14px; padding: 12px; margin-bottom: 10px; }
.q-card.done { border-color: var(--border-color); }
.q-top { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--text-muted); margin-bottom: 6px; }
.q-top b { font-size: 13.5px; color: var(--text-main); }
.q-top .icon-btn-plain { margin-left: auto; }
.q-st { font-size: 10.5px; font-weight: 800; padding: 2px 8px; border-radius: 999px; background: var(--accent-color); color: #fff; }
.q-st.ok { background: var(--border-color); color: var(--text-muted); }
.q-reply textarea { width: 100%; margin-top: 8px; padding: 9px 10px; border-radius: 10px; border: 1px solid var(--border-color); background: var(--bg-input, var(--bg-body)); color: var(--text-main); font: inherit; font-size: 13px; resize: vertical; }
.q-btns { display: flex; gap: 6px; justify-content: flex-end; margin-top: 6px; }
.q-link { background: none; border: none; color: var(--text-muted); font: inherit; font-size: 11.5px; text-decoration: underline; cursor: pointer; }
.q-dot { display: inline-block; min-width: 18px; padding: 0 5px; border-radius: 9px; background: #E5484D; color: #fff; font-size: 11px; line-height: 18px; }
.q-dot.soft { background: var(--accent-color); }
.sub-acts .sub-detail-toggle { margin-top: 0; }
.sub-acts { margin-top: 6px; display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.sub-view-btn { display: inline-flex; align-items: center; gap: 5px; padding: 6px 10px; border-radius: 999px; border: 1px solid var(--accent-color); background: transparent; color: var(--accent-color); font: inherit; font-size: 11.5px; font-weight: 800; cursor: pointer; }
/* 운동 그래프 */
.motion-panel { border-top: 1px solid var(--border-color); padding: 8px 10px 10px; display: flex; flex-direction: column; gap: 6px; background: var(--bg-card); }
.motion-panel[hidden] { display: none; }
.mp-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: wrap; font-size: 13px; font-weight: 800; color: var(--text-main); }
.mp-head i { color: var(--accent-color); }
.mp-head small { font-size: 11px; color: var(--text-muted); font-weight: 700; }
.motion-panel canvas { display: block; width: 100%; height: 198px; flex: 1; min-height: 0; border-radius: 12px; background: var(--bg-body); touch-action: pan-y pinch-zoom; }
.mp-hint { font-size: 11.5px; color: var(--text-muted); line-height: 1.5; }
.mp-hint b { color: var(--text-main); }
:root { --vel: #2F80ED; }
.fstep { display: inline-flex; gap: 6px; }
.fstep[hidden] { display: none; }
/* 학습 목표 · 활동지 */
.steps-top { display: flex; align-items: center; gap: 6px; }
.steps-top .sp { flex: 1; }
.goal-btn { display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: 999px; border: 1.5px solid var(--accent-color); background: color-mix(in srgb, var(--accent-color) 10%, transparent); color: var(--accent-color); font: inherit; font-size: 12.5px; font-weight: 800; cursor: pointer; }
.goal-modal { max-width: 520px; }
.goal-q { font-size: 13px; line-height: 1.6; padding: 10px 12px; border-radius: 12px; background: var(--bg-body); margin-bottom: 12px; color: var(--text-main); }
.goal-row { display: flex; gap: 10px; padding: 10px 6px; border-bottom: 1px solid var(--border-color); align-items: flex-start; }
.goal-row:last-child { border-bottom: 0; }
.goal-row b { font-size: 13.5px; color: var(--text-main); }
.goal-row p { font-size: 13px; color: var(--text-muted); line-height: 1.55; margin-top: 2px; }
.goal-row.cur { background: color-mix(in srgb, var(--accent-color) 9%, transparent); border-radius: 12px; }
.goal-n { flex-shrink: 0; width: 24px; height: 24px; border-radius: 50%; background: var(--accent-color); color: #fff; font-size: 12px; font-weight: 800; display: flex; align-items: center; justify-content: center; }
.sheet-ui { display: none !important; }
.sheet-chip { position: absolute; right: 10px; top: 10px; z-index: 6; align-items: center; gap: 6px; padding: 7px 14px; border-radius: 999px; border: 1.5px solid var(--accent-color); background: color-mix(in srgb, var(--bg-container) 92%, transparent); color: var(--accent-color); font: inherit; font-size: 13px; font-weight: 800; cursor: pointer; box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
.sheet-chip.on { background: var(--accent-color); color: #fff; }
html.stu .lab:not(.sheet-closed) .sheet-chip.sheet-ui { display: none !important; } /* 활동지가 열려 있으면 '닫기'로 닫아요 */
@media (min-width: 901px) {
html.stu .lab.bar-dock { gap: 0; }
html.stu .lab.bar-dock .lgrid .stage { position: relative; top: auto; }
html.stu .lab.bar-dock .stage-bar { position: relative; z-index: 6; flex-wrap: nowrap; overflow-x: auto; background: var(--bg-card); border: 1.5px solid var(--border-color); border-radius: 0 0 18px 18px; padding: 10px 14px; }
html.stu .lab.bar-dock .lgrid .stage, html.stu .lab.bar-dock .lgrid .steps { border-bottom-left-radius: 0; border-bottom-right-radius: 0; border-bottom: none; } /* 실험 화면·활동지 아래에 조작 막대가 바로 붙어요 */
html.stu .lab.bar-dock .stage-bar .pbtn { flex-shrink: 0; }
}
@media (min-width: 901px) {
html.stu .sheet-ui:not([hidden]) { display: inline-flex !important; }
html.stu .lab.sheet-closed .lgrid { grid-template-columns: minmax(0, 1fr); }
html.stu .lab.sheet-closed .steps { display: none; }
html.stu .lab:not(.sheet-closed) .lgrid { grid-template-columns: minmax(0, 1.15fr) minmax(360px, 1fr); }
}
/* ✏️ 발표 도구 */
.pres-cv { position: fixed; inset: 0; width: 100vw; height: 100vh; z-index: 8000; pointer-events: none; } /* 창(모달)이 열려도 그 위에 쓸 수 있어요 */
.pres-cv.draw { pointer-events: auto; touch-action: none; }
html.pres-pointer, html.pres-pointer * { cursor: none !important; }
.pres-bar { position: fixed; left: 8px; top: 50%; transform: translateY(-50%); z-index: 9001; display: flex; flex-direction: column; gap: 4px; padding: 6px; border-radius: 18px; background: var(--bg-container); border: 1.5px solid var(--border-color); box-shadow: 0 10px 28px rgba(0,0,0,0.16); }
.pres-b { display: flex; flex-direction: column; align-items: center; gap: 2px; width: 52px; padding: 7px 0 5px; border-radius: 12px; border: none; background: transparent; color: var(--text-main); font: inherit; font-size: 10px; font-weight: 800; cursor: pointer; }
.pres-b i { font-size: 16px; color: var(--accent-color); }
.pres-b.on { background: var(--accent-color); color: #fff; }
.pres-b.on i { color: #fff; }
.pres-colors { display: grid; grid-template-columns: 1fr 1fr; gap: 5px; padding: 4px 6px; }
.pres-c { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--bg-container); box-shadow: 0 0 0 1.5px var(--border-color); cursor: pointer; justify-self: center; }
.pres-c.on { box-shadow: 0 0 0 2.5px var(--text-main); }
.pres-bar.fold > :not(.pres-fold):not(.pres-grip) { display: none; }
.pres-grip { display: flex; align-items: center; justify-content: center; height: 22px; margin: -2px 0 2px; border-radius: 10px; color: var(--text-muted); cursor: grab; touch-action: none; font-size: 13px; }
.pres-grip:hover { background: var(--bg-body); }
.pres-bar.drag { opacity: .85; } .pres-bar.drag .pres-grip { cursor: grabbing; }
.pres-fold { padding: 4px 0; }
@media (min-width: 901px) { html.stu body:has(.pres-bar) .s-wrap { padding-left: 76px; } }
/* 운동 그래프 팝업 */
.mp-float { width: 460px; height: 300px; left: 10px; bottom: 10px; right: auto; resize: both; overflow: hidden; min-width: 280px; min-height: 190px; max-width: calc(100% - 8px); max-height: calc(100% - 8px); gap: 6px; }
.mp-float .sw-grip small { font-size: 10.5px; font-weight: 700; color: var(--text-muted); }
.mp-rows .pbtn { padding: 4px 9px; font-size: 11.5px; }
.mp-float canvas { display: block; width: 100%; height: auto !important; flex: 1; min-height: 0; border-radius: 12px; background: var(--bg-body); touch-action: pan-y pinch-zoom; }
.mp-float .mp-hint { font-size: 10.5px; line-height: 1.4; }
/* 발표 도구: 도구 막대 위에서는 포인터 대신 보통 커서 */
html.pres-pointer .pres-bar, html.pres-pointer .pres-bar * { cursor: pointer !important; }
.pres-cv.draw { touch-action: pinch-zoom; }
/* 앱 안 전체화면(iframe)에서는 오른쪽 위 닫기 버튼 자리를 비워요 */
.pres-tip { position: fixed; z-index: 9002; transform: translateX(-50%); padding: 4px 10px; border-radius: 999px; background: #2F80ED; color: #fff; font-size: 12px; font-weight: 800; pointer-events: none; box-shadow: 0 4px 12px rgba(0,0,0,0.18); }
.pres-tip[hidden] { display: none; }
.pres-snap:not(.on) i { color: var(--text-muted); }
.pres-snap.on { background: transparent; color: var(--text-main); }
.pres-snap.on i { color: #2F80ED; }
/* 질문 분류 · 평가 */
.qb-tabs { display: flex; gap: 6px; margin-bottom: 10px; flex-wrap: wrap; }
.qb-tab { padding: 7px 12px; border-radius: 999px; border: 1.5px solid var(--border-color); background: var(--bg-card); color: var(--text-muted); font: inherit; font-size: 12.5px; font-weight: 800; cursor: pointer; }
.qb-tab b { color: var(--text-main); margin-left: 2px; }
.qb-tab.on { background: var(--accent-color); border-color: var(--accent-color); color: #fff; }
.qb-tab.on b { color: #fff; }
.grade-modal { max-width: 520px; }
.gr-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; font-size: 13px; color: var(--text-muted); font-weight: 700; }
.gr-top b { font-size: 22px; color: var(--accent-color); }
.gr-row { padding: 10px 0; border-bottom: 1px solid var(--border-color); display: flex; flex-direction: column; gap: 6px; }
.gr-h b { font-size: 13.5px; color: var(--text-main); display: block; }
.gr-h span { font-size: 11.5px; color: var(--text-muted); }
.gr-ev { display: flex; flex-wrap: wrap; gap: 4px; }
.gr-ev span { font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 999px; background: var(--bg-body); color: var(--text-muted); border: 1px solid var(--border-color); }
.gr-lv { display: flex; gap: 6px; align-items: center; }
.gr-lv em { font-style: normal; font-size: 11.5px; color: var(--accent-color); font-weight: 700; margin-left: 4px; }
.grade-modal .concl-ta { margin-top: 10px; width: 100%; }
.g-badge { display: inline-flex; align-items: center; gap: 4px; padding: 3px 9px; border-radius: 999px; font-size: 11.5px; font-weight: 800; background: color-mix(in srgb, var(--accent-color) 14%, transparent); color: var(--accent-color); border: none; cursor: pointer; }
.g-badge.none { background: var(--bg-body); color: var(--text-muted); border: 1px dashed var(--border-color); }
.sub-list-item { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border: 1px solid var(--border-color); border-radius: 12px; margin-bottom: 8px; background: var(--bg-card); }
.sub-list-item .t { flex: 1; min-width: 0; }
.sub-list-item .t b { font-size: 14px; color: var(--text-main); }
.sub-list-item .t span { display: block; font-size: 11.5px; color: var(--text-muted); }
/* 반 전체 분석: 모둠별 색 이름표 */
.who-legend { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 4px 0 6px; }
.who-legend:empty { display: none; }
.who-chip { display: inline-flex; align-items: center; gap: 5px; padding: 4px 10px; border-radius: 999px; border: 1.5px solid var(--border-color); background: var(--bg-card); color: var(--text-main); font: inherit; font-size: 12px; font-weight: 800; cursor: pointer; }
.who-chip i { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.who-chip small { color: var(--text-muted); font-weight: 700; }
.who-chip.on { border-color: var(--text-main); box-shadow: 0 0 0 1px var(--text-main); }
.who-chip.off { opacity: .45; }
.who-tip { font-size: 11px; color: var(--text-muted); }
.board .who-chip { font-size: 15px; padding: 6px 14px; }
.board .who-chip i { width: 13px; height: 13px; }
.pres-ptr { position: fixed; inset: 0; width: 100vw; height: 100vh; z-index: 9000; pointer-events: none; }
/* 꾹 눌러도 글자 선택·복사 메뉴가 뜨지 않게 (입력칸은 그대로) */
.lab, .pres-bar, .sw-float, .set-pop { -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
.lab input, .lab textarea, .lab [contenteditable] { -webkit-user-select: text; user-select: text; -webkit-touch-callout: default; }
.lab button, .pres-bar button, .cond-chip, .ck { touch-action: manipulation; -webkit-tap-highlight-color: transparent; }
.pres-finger.on { background: transparent; color: var(--text-main); box-shadow: inset 0 0 0 2px var(--accent-color); }
/* ✍️ 쓰기 칸: 테마(크림색) 카드 */
.write-box { display: flex; flex-direction: column; gap: 8px; margin-top: 12px; padding: 12px 14px; border-radius: 14px; border: 1.5px solid color-mix(in srgb, var(--accent-color) 35%, var(--border-color)); background: var(--bg-body); }
.write-box .ef-h { color: var(--accent-color); font-size: 13px; }
.write-box .ef-h i { color: var(--accent-color); }
.write-box .concl-ta { background: var(--bg-card); }
.write-box .concl-ta:focus { border-color: var(--accent-color); }
.write-q { display: flex; flex-direction: column; gap: 6px; font-size: 13px; font-weight: 700; color: var(--text-main); line-height: 1.5; }
.write-q textarea { width: 100%; }
.sw-float.free { position: fixed; z-index: 120; } /* 끌어서 옮긴 창은 화면 어디든 */
html.stu .lgrid .stage { z-index: 5; } /* 옮긴 도구 창이 활동지 위에 보이게 */
.stage { position: relative; }
@media (min-width: 901px) { html.stu .lgrid .stage { position: sticky; } }
.ck.press { transform: scale(0.92); filter: brightness(0.92); }
.nowrap { white-space: nowrap; }
/* ② 용수철 고르기 · ③ 변인 고르기 */
.kpick-row { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 6px; }
.kpick-row .kp-h, .var-pick .kp-h { grid-column: 1 / -1; font-size: 12.5px; font-weight: 800; color: var(--text-muted); }
.ptable tr.chosen td { background: color-mix(in srgb, var(--accent-color) 10%, transparent); }
.k-chosen { font-size: 11.5px; font-weight: 800; color: var(--accent-color); }
.var-pick { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; }
.vp { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 10px 4px; border-radius: 14px; border: 1.5px solid var(--border-color); background: var(--bg-card); color: var(--text-main); font: inherit; cursor: pointer; }
.vp b { font-size: 13px; } .vp span { font-size: 11px; color: var(--text-muted); font-weight: 700; }
.vp { position: relative; border: 1.5px dashed var(--border-color); background: var(--bg-container); color: var(--text-muted); }
.vp b { color: var(--text-muted); }
.vp.going { border-style: solid; }
.vp.done { border: 1.5px solid var(--accent-color); }
.vp.done b { color: var(--accent-color); }
.vp.on { box-shadow: 0 0 0 2px var(--bg-accent-alpha); background: var(--bg-accent-alpha); }
.vp-ok { position: absolute; top: -7px; right: -7px; width: 20px; height: 20px; border-radius: 50%; background: var(--accent-color); color: #fff; font-size: 11px; font-weight: 900; display: flex; align-items: center; justify-content: center; font-style: normal; box-shadow: 0 0 0 2px var(--bg-card); }
.var-pick .kp-h small { font-weight: 700; color: var(--text-muted); opacity: .8; margin-left: 4px; }
/* 🧮 주기 공식 만들기 */
.fb { display: flex; flex-direction: column; gap: 8px; }
.fb-eq { align-self: center; display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 800; padding: 10px 18px; border-radius: 14px; background: var(--bg-body); border: 1.5px solid var(--border-color); font-family: "Times New Roman", serif; }
.fb-eq b { color: var(--accent-color); }
.fb-frac { display: inline-flex; flex-direction: column; align-items: center; line-height: 1.15; }
.fb-frac span:first-child { border-bottom: 2px solid currentColor; padding: 0 6px 2px; }
.fb-frac span:last-child { padding: 2px 6px 0; }
.fb-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.fb-v { min-width: 104px; font-size: 12.5px; font-weight: 800; color: var(--text-main); }
.ptable th.mv, .ptable td.mv { background: color-mix(in srgb, var(--accent-color) 12%, transparent); font-weight: 800; }
.ptable td.diff { background: rgba(229,72,77,0.16); color: #D93036; font-weight: 800; }
.exp-h b { flex: 1; }
.ptable.ktable { min-width: 0; }
.ktable th, .ktable td { padding-left: 4px; padding-right: 4px; }
.ktable td:last-child { padding-right: 8px; }
.ktable .pbtn.sm { padding: 5px 10px; }
.ktable td { white-space: nowrap; }
.ptable td input.kin-wide { width: 74px; min-width: 74px; text-align: center; font-size: 13px; }
.k-chosen { display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px; border-radius: 999px; background: color-mix(in srgb, var(--accent-color) 14%, transparent); }
.t-graph { margin-top: 14px; padding-top: 12px; border-top: 1.5px dashed var(--border-color); display: flex; flex-direction: column; gap: 6px; }
.t-graph[hidden] { display: none; }
html.stu .lab:not(.sheet-closed) .sheet-chip { display: none !important; } /* 활동지를 열면 버튼은 숨기고, 활동지의 '닫기'로 닫아요 */
.copy-row { margin-top: -2px; align-items: center; gap: 8px; }
.kcell { position: relative; }
.kcard .read-cond { display: none; }
.kcard .read-row { margin: 0; }
.step-tab { position: relative; }
.step-tab.done::after { content: "✓"; position: absolute; top: -7px; right: -7px; width: 20px; height: 20px; border-radius: 50%; background: var(--accent-color); color: #fff; font-size: 11px; font-weight: 900; display: flex; align-items: center; justify-content: center; box-shadow: 0 0 0 2px var(--bg-card); }
html.stu, html.stu body { overscroll-behavior-y: none; } /* 화면을 쓸어내려도 새로고침되지 않아요 (실험 중 기록이 날아가지 않게) */
.grp-row { flex-wrap: nowrap; overflow-x: auto; overscroll-behavior-x: contain; padding-bottom: 4px; scrollbar-width: thin; -webkit-overflow-scrolling: touch; } /* 제출한 모둠이 많으면 한 줄로, 좌우로 밀어서 봐요 */
.grp-row .pbtn { flex-shrink: 0; white-space: nowrap; }
.grp-dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 5px; vertical-align: 1px; }