.interior-page main{height:calc(100dvh - 76px);min-height:540px;display:grid;grid-template-columns:266px minmax(0,1fr) 276px;gap:14px;padding:14px}
.study,.inspection{padding:20px;background:var(--panel);border:1px solid var(--line);border-radius:14px;overflow:auto;scrollbar-width:thin}
.study>p,.inspection>p{font-size:12px;color:var(--muted);line-height:1.7}
.steps{display:grid;gap:8px;margin:22px 0}
.steps button{display:flex;align-items:start;gap:12px;text-align:left;padding:12px;font-size:12px}
.steps span{font-weight:650}
.steps small{display:block;font-size:11px;font-weight:400;margin-top:3px}
.steps button[aria-pressed=true]{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}
aside section{border-top:1px solid var(--line);padding-top:15px;margin-top:22px}
aside section h2{font-size:13px}
label{display:flex;align-items:center;gap:8px;margin:14px 0;font-size:12px}
label .dot{margin-left:auto}
.legend{position:absolute;left:22px;right:22px;bottom:108px;display:flex;gap:14px;flex-wrap:wrap;pointer-events:none;font-size:11px;color:#d9e6f2}
.legend span{display:flex;gap:6px;align-items:center;background:#172c40c9;border-radius:5px;padding:4px 7px}
.inspection h2{font-size:25px}
.inspection p{font-size:12px}
.stage-heading #step-description{max-width:430px;line-height:1.6}
.boundary ul{padding-left:16px;color:var(--muted);font-size:12px}
.boundary li{margin:9px 0}
#cut-controls>button{font-size:11px;margin:6px 0;display:block;width:100%;text-align:left}
.back-link{display:inline-block;font-size:12px;margin-top:8px}

@media(max-width:1200px){.interior-page main{height:auto;grid-template-columns:240px minmax(0,1fr)}
.study,.stage{height:calc(100dvh - 104px);min-height:500px}
.inspection{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:0 28px}
.inspection section{grid-column:2;grid-row:1/5;margin-top:0}
.inspection .boundary{grid-column:1}
}

@media(max-width:760px){.interior-page main{display:flex;flex-direction:column;padding:10px;gap:10px;min-height:0}
.stage{order:0;height:60svh;min-height:440px}
.study{order:2;height:auto;min-height:0}
.inspection{order:1;display:block}
.study h1 br{display:none}
.steps{grid-template-columns:1fr 1fr}
.steps button{font-size:12px;gap:8px;padding:11px}
.inspection section{margin-top:20px}
.stage-heading #step-description{max-width:250px;font-size:11px}
.legend{left:15px;right:15px;gap:6px;font-size:10px}
.stage-footer{font-size:9px}
}
/* Reserve room for the explanation and legend on narrow screens. */
@media(max-width:760px){.interior-page .stage{height:65svh;min-height:510px}.stage #interior-canvas{inset:150px 0 130px}}