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h2{font-size:22px;color:var(--ink)}.teacher-grid{max-width:1380px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:22px;align-items:start}.teacher-panel{background:var(--surface);border:1px solid var(--line);padding:20px}.teacher-panel .panel-label{margin-bottom:12px}.panel-intro{font-size:11px;color:var(--muted);margin-bottom:12px}.teacher-missions .teacher-panel{grid-column:1}.teacher-actions{grid-column:2}.teacher-answer-key{grid-column:1 / -1}.teacher-mission-list{border-top:1px solid var(--ink)}.teacher-mission{display:grid;grid-template-columns:34px 28px minmax(0,1fr) auto 28px;align-items:center;gap:10px;padding:11px 4px;border-bottom:1px solid var(--line)}.teacher-mission.is-off{opacity:.5}.teacher-mission-index{font-size:16px;font-weight:700;color:var(--muted);font-variant-numeric:tabular-nums}.teacher-mission-copy{display:flex;flex-direction:column;gap:1px}.teacher-mission-copy strong{font-size:12.5px}.teacher-mission-copy 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var(--accent);outline-offset:2px}.action-list{display:flex;flex-direction:column}.action-row{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:12px 0;border-top:1px solid var(--line)}.action-row:first-child{border-top:0}.action-row strong{display:block;font-size:12px}.action-row div span{display:block;font-size:9.5px;color:var(--muted);margin-top:1px}.teacher-button-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}.teacher-answer-key .answer-key{border-top:1px solid var(--ink)}.answer-item{border-bottom:1px solid var(--line)}.answer-item summary{display:grid;grid-template-columns:30px minmax(0,1fr) auto 20px;gap:10px;align-items:center;padding:11px 4px;cursor:pointer;-webkit-user-select:none;user-select:none;list-style:none}.answer-item summary::-webkit-details-marker{display:none}.answer-item summary:hover{background:var(--surface-2)}.answer-item summary 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var(--line)}.graphs-panel{order:3}.inspector{order:4}.stage-body{min-height:430px}.inspector{border-left:0;display:grid;grid-template-columns:1fr 1fr}.panel-section{border-right:1px solid var(--line)}.panel-section:last-child{grid-column:1 / -1}#mission-panel:empty{display:none}#mission-panel:not(:empty){grid-column:1 / -1}#mission-panel:not(:empty)+.panel-section{border-top:0}.graphs-panel{min-height:250px}.mission-detail-inner{padding:22px}.teacher-grid{grid-template-columns:1fr}.teacher-actions,.teacher-answer-key{grid-column:1}}@media(max-width:900px){.masthead{gap:14px;padding:0 14px}.brand-copy span{display:none}.nav-item{padding:0 10px;font-size:12px}.model-chip small{display:none}.missions-screen,.teacher-screen{padding:24px 20px 50px}.page-head{align-items:flex-start;flex-direction:column;gap:16px}.page-stat{width:100%;flex-direction:row;align-items:center;justify-content:space-between}.page-stat .progress-bar{flex:1;margin:0 14px}.missions-layout{grid-template-columns:1fr;gap:18px}.mission-list{flex-direction:row;overflow-x:auto;border-top:0;gap:6px;padding-bottom:4px}.mission-list-item{flex:0 0 230px;grid-template-columns:34px minmax(0,1fr);border:1px solid var(--line);border-left:3px solid transparent;padding:10px}.mission-list-item.is-active{border-color:var(--line-strong);border-left-color:var(--accent)}.mission-state{grid-column:2}.mission-index{grid-row:1 / span 2;font-size:20px}.mission-track-preview{grid-template-columns:1fr}.preview-thumb{border-right:0;border-bottom:1px solid var(--line)}.preview-thumb .track-thumb{height:100px}.teacher-panel{padding:16px}.teacher-mission{grid-template-columns:34px 26px minmax(0,1fr) auto}.teacher-mission .icon-btn{display:none}}@media(max-width:720px){:root{--header-height: 58px}.masthead{padding:0 10px}.brand-mark{width:30px;height:30px}.brand-copy strong{font-size:15px}.main-nav{margin-left:auto}.nav-item{padding:0 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