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var(--line);align-items:flex-start;gap:15px;margin-top:15px;padding-top:13px;display:flex}.turn-history>span{color:var(--faint);flex:none;padding-top:4px;font-size:9px;font-weight:650}.turn-history>div{flex-wrap:wrap;gap:5px;min-width:0;display:flex}.turn-history p{color:var(--faint);margin:2px 0 0;font-size:10px}.turn-history code{color:var(--muted);background:var(--stage);font-family:var(--mono);border-radius:5px;padding:3px 5px;font-size:9px}.coach-panel{scrollbar-width:thin;scrollbar-color:var(--line-strong) transparent;border-radius:18px;max-height:calc(100dvh - 48px);padding:23px;animation:.54s cubic-bezier(.16,1,.3,1) both coach-enter;overflow-y:auto}.coach-topline{color:var(--faint);font-family:var(--mono);text-transform:uppercase;letter-spacing:.07em;justify-content:space-between;margin-bottom:16px;font-size:9px;display:flex}.coach-panel h1{font-family:var(--heading);letter-spacing:-.055em;margin-bottom:10px;font-size:29px;font-weight:600;line-height:1.16}.lesson-summary{color:var(--muted);margin-bottom:20px;font-size:13px;line-height:1.6}.lesson-body{border-top:1px solid var(--line);padding-top:18px}.lesson-body p{color:var(--muted);margin-bottom:13px;font-size:12px;line-height:1.72}.checkpoint-block{margin-top:21px}.checkpoint-block h2,.algorithm-heading h2{font-family:var(--heading);letter-spacing:-.02em;margin-bottom:11px;font-size:12px;font-weight:600}.checkpoint-block ul{gap:10px;margin:0;padding:0;list-style:none;display:grid}.checkpoint-block li{color:var(--muted);align-items:flex-start;gap:8px;font-size:11px;line-height:1.55;display:flex}.checkpoint-block li svg{color:var(--success);flex:none;margin-top:1px}.algorithm-block{border:1px solid var(--accent-line);background:var(--accent-soft);border-radius:13px;margin-top:22px;padding:15px}.algorithm-heading{justify-content:space-between;align-items:baseline;gap:10px;display:flex}.algorithm-heading>span{color:var(--accent);font-family:var(--mono);font-size:8px}.algorithm-notation{flex-wrap:wrap;gap:5px;display:flex}.algorithm-notation code{text-align:center;border:1px solid var(--accent-line);min-width:27px;color:var(--accent);background:var(--panel);font-family:var(--mono);border-radius:6px;padding:5px 6px;font-size:10px}.algorithm-block>p{color:var(--muted);margin:12px 0;font-size:10px;line-height:1.6}.button-demo{width:100%;color:var(--accent-contrast);background:var(--accent)}.lesson-tip{color:var(--muted);align-items:flex-start;gap:9px;margin-top:18px;display:flex}.lesson-tip svg{color:var(--accent);flex:none}.lesson-tip p{margin-bottom:0;font-size:10.5px;line-height:1.6}.complete-button{border:1px solid var(--line-strong);width:100%;min-height:44px;color:var(--muted);cursor:pointer;background:0 0;border-radius:10px;justify-content:center;align-items:center;gap:8px;margin-top:20px;padding:0 12px;font-size:11px;font-weight:650;display:flex}.complete-button>span{border:1px solid var(--line-strong);border-radius:5px;place-items:center;width:17px;height:17px;display:grid}.complete-button.is-complete{border-color:var(--accent-line);color:var(--accent);background:var(--accent-soft)}.complete-button.is-complete>span{border-color:var(--accent);color:var(--accent-contrast);background:var(--accent)}.lesson-pagination{border-top:1px solid var(--line);justify-content:space-between;margin-top:18px;padding-top:15px;display:flex}.lesson-pagination button{min-height:40px;color:var(--muted);cursor:pointer;background:0 0;border:0;align-items:center;gap:6px;padding:0;font-size:10px;font-weight:650;display:inline-flex}.lesson-pagination button:disabled{opacity:.35}.action-error{z-index:20;border:1px solid var(--danger);max-width:380px;color:var(--danger);background:var(--panel-strong);box-shadow:var(--shadow);border-radius:12px;padding:14px 17px;font-size:12px;line-height:1.5;position:fixed;bottom:24px;right:24px}@keyframes workspace-enter{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes coach-enter{0%{opacity:0;transform:translateY(15px)}to{opacity:1;transform:translateY(0)}}@keyframes loading-pulse{0%{opacity:.35;transform:scale(.96)}to{opacity:.8;transform:scale(1)}}@media (hover:hover){.icon-button:hover,.lesson-nav-item:hover{border-color:var(--line-strong);background:var(--panel-strong)}.button-primary:hover,.button-demo:hover{background:var(--accent-hover)}.button-secondary:hover,.button-quiet:hover,.move-pair button:hover,.complete-button:hover{border-color:var(--accent-line);color:var(--accent);background:var(--accent-soft)}.lesson-pagination 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18px}.app-layout{grid-template-columns:minmax(0,1fr);padding:14px}.lesson-sidebar{display:block}.sidebar-intro{padding-inline:2px}.sidebar-intro>p:last-child{max-width:430px}.course-progress{max-width:240px;margin:16px 2px}.lesson-nav{grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.lesson-nav-item{min-height:56px}.coach-panel{max-height:none;position:static;overflow:visible}.cube-stage{height:410px}}@media (width<=560px){.app-header{height:64px;padding:0 14px}.brand-description,.prerequisite{display:none}.brand-name{font-size:16px}.app-layout{gap:12px;padding:10px}.panel-toolbar{flex-direction:column;padding:15px}.cube-actions{grid-template-columns:repeat(2,minmax(0,1fr));width:100%;display:grid}.cube-actions .button{padding-inline:8px}.cube-stage{height:350px;margin:0 7px}.cube-caption{padding-inline:14px;font-size:9px}.turn-panel{padding:15px}.turn-panel-heading{align-items:flex-start}.turn-panel-heading p{max-width:170px}.segmented-control button{min-width:53px}.turn-history{flex-direction:column;gap:7px}.coach-panel{padding:21px}.coach-panel h1{font-size:28px}.action-error{bottom:12px;left:12px;right:12px}}@media (width<=370px){.lesson-nav{grid-template-columns:1fr}.cube-stage{height:320px}.turn-panel-heading{flex-direction:column}}.app{flex-direction:column;height:100dvh;min-height:0;display:flex;overflow:hidden}.app-header{flex:0 0 72px}.app-layout{flex:auto;align-items:stretch;min-height:0;overflow:hidden}.lesson-sidebar,.coach-panel{height:100%;max-height:none;position:static;top:auto;overflow-y:auto}.practice-column{grid-template-rows:minmax(0,1fr) auto;height:100%;min-height:0}.cube-panel{flex-direction:column;min-height:0;display:flex}.panel-toolbar,.cube-caption,.turn-panel{flex:none}.cube-stage{flex:auto;height:auto;min-height:140px}.mobile-view-switch{display:none}@media (width>=791px) and (height<=780px){.app-header{flex-basis:60px}.app-layout{padding:14px}.turn-history{display:none}.cube-stage{min-height:110px}.coach-panel{padding:18px}}@media (width<=790px){.app-header{flex-basis:64px}.app-layout{padding:10px;display:block}.lesson-sidebar{display:none}.practice-column{gap:10px}.practice-column.mobile-inactive,.coach-panel.mobile-inactive{display:none}.practice-column.mobile-active{display:grid}.coach-panel.mobile-active{display:block}.coach-panel{border-radius:16px;height:100%;padding:20px;overflow-y:auto}.panel-toolbar{gap:10px;padding:12px}.panel-toolbar .section-label{display:none}.panel-toolbar h2{font-size:17px}.cube-actions{grid-template-columns:repeat(4,minmax(0,1fr));gap:5px;display:grid}.cube-actions .button{gap:4px;padding:0 5px;font-size:10px}.cube-actions .button svg{display:none}.cube-stage{height:auto;min-height:130px;margin:0 7px}.cube-caption{min-height:34px;padding:8px 12px}.turn-panel{padding:12px}.turn-panel-heading{flex-direction:row;align-items:center}.turn-panel-heading p,.turn-history{display:none}.turn-panel-heading h3{margin-bottom:0}.segmented-control button{min-height:44px}.move-grid{margin-top:12px}.move-pair button{height:44px}.mobile-view-switch{border-top:1px solid var(--line);background:var(--panel);flex:0 0 60px;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px;padding:7px 12px;display:grid}.mobile-view-switch button{min-height:44px;color:var(--muted);background:0 0;border:1px solid #0000;border-radius:10px;justify-content:center;align-items:center;gap:7px;font-size:12px;font-weight:650;display:inline-flex}.mobile-view-switch button.active{border-color:var(--accent-line);color:var(--accent);background:var(--accent-soft)}.action-error{bottom:72px}}@media (width<=790px) and (height<=700px){.cube-caption{display:none}.cube-stage{min-height:100px}}@media (width<=370px){.cube-actions{grid-template-columns:repeat(2,minmax(0,1fr))}.turn-panel-heading{flex-direction:row}}.guide-heading{color:var(--muted);justify-content:space-between;align-items:center;gap:10px;margin:-2px 0 12px;font-size:10px;font-weight:650;display:flex}.guide-toggle{min-height:30px;color:var(--accent);font-family:var(--mono);cursor:pointer;background:0 0;border:0;align-items:center;gap:6px;padding:0;font-size:9px;display:inline-flex}.guide-toggle-track{background:var(--line-strong);border-radius:20px;width:28px;height:16px;padding:2px;transition:background .16s;display:block}.guide-toggle-track>span{background:var(--panel-strong);border-radius:50%;width:12px;height:12px;transition:transform .16s;display:block}.guide-toggle[aria-checked=true] .guide-toggle-track{background:var(--accent)}.guide-toggle[aria-checked=true] .guide-toggle-track>span{transform:translate(12px)}.move-guide 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