/* 应用壳：占满视口，标签切换视图 */
body.app{padding:0;height:100vh;display:grid;grid-template-rows:48px 1fr;overflow:hidden}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--line);background:var(--bg2)}
.brand{display:flex;align-items:baseline;gap:14px;min-width:0}
.logo{font-family:var(--display);font-size:22px;letter-spacing:.08em;color:var(--amber2);white-space:nowrap}
.sub{font-family:var(--mono);font-size:11px;color:var(--muted);letter-spacing:.04em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tabs{display:flex;gap:4px}
.tab{background:none;border:1px solid transparent;color:var(--ink2);padding:6px 12px;border-radius:4px;font-size:14px}
.tab:hover{color:var(--ink);border-color:var(--line)} .tab.active{color:var(--amber2);background:var(--surface);border-color:var(--line)}
.view{min-height:0;overflow:hidden}
.view.playground,.view.bench{max-width:none;margin:0;padding:14px 18px;grid-template-columns:minmax(0,1fr) 300px;height:100%;box-sizing:border-box;align-items:stretch}
.view.playground{display:grid} .view.bench{display:grid}
.view[hidden]{display:none!important}
.world-stage{aspect-ratio:auto;height:100%;position:relative;display:flex;align-items:center;justify-content:center;background:var(--bg2)}
#world{width:auto;max-width:100%;max-height:100%}
.stage-hint{position:absolute;left:14px;bottom:10px;right:14px;font-size:12px;color:var(--ink2);pointer-events:none;text-shadow:0 1px 4px #000}
.panel{overflow-y:auto;min-height:0}
.view.bench .stage{min-height:0;height:100%}
.view.report,.view.methods{overflow-y:auto;padding:24px 18px 48px}
.view.report{display:flex;flex-direction:column;gap:36px;max-width:960px;margin:0 auto;width:100%;box-sizing:border-box}
.view.methods .chapter{max-width:760px;margin:0 auto}
.chapter h2{font-size:26px} .chapter h2 small{display:block;font-family:var(--body);font-size:13px;color:var(--ink2);letter-spacing:0;margin-top:6px}
.colophon{margin-top:32px}
@media (max-width:820px){
  body.app{height:auto;overflow:auto;grid-template-rows:auto 1fr}
  .topbar{flex-direction:column;align-items:flex-start;gap:8px;padding:10px 16px} .sub{display:none}
  .view.playground,.view.bench{grid-template-columns:1fr;height:auto}
  .world-stage{aspect-ratio:900/560;height:auto} .view.bench .stage{height:60vh}
}