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.quiet{padding-right:0;font-size:12px}.input-row .primary{flex:1}.start-button{width:100%}.ready-card{padding:20px}.landing h1{font-size:49px}.lede{font-size:16px}}@media(prefers-reduced-motion:no-preference){button,a{transition:background-color .12s,border-color .12s}.loading-dot{animation:pulse 1s infinite alternate}@keyframes pulse{to{opacity:.25}}}
/* Every unused horizontal margin is a button; the reading column and its scrollbar
   keep their own grid cell. This follows available stage width, including beside a TOC. */
.slide-stage{flex:1;min-width:0;min-height:0;display:grid;grid-template-columns:minmax(24px,1fr) minmax(0,924px) minmax(24px,1fr)}
.slide-stage .slide-scroll{min-width:0}
.slide-stage .slide-inner{max-width:none;padding-inline:0}
.slide-edge{border:0;border-radius:0;background:transparent;color:var(--muted);padding:0;min-width:0;font-size:22px;outline-offset:-5px!important;touch-action:pan-y pinch-zoom;user-select:none}
.slide-edge>span{opacity:0;pointer-events:none}
@media(hover:hover){.slide-edge:hover:not(:disabled)>span{opacity:.16}}
.slide-edge:focus-visible{outline:2px solid #658519;background:transparent}
.slide-edge:focus-visible>span{opacity:1}
.slide-edge:disabled{opacity:1}
@media(forced-colors:active){.slide-edge:focus-visible{outline-color:Highlight}}

/* Contents and slide layout follow available space; the page-wide drawer switch
   reserves at least 560px for the slide stage instead of squeezing its text. */
.presentation-workspace{display:flex;flex:1;min-height:0;min-width:0;position:relative;isolation:isolate}
.presentation-body{display:flex;flex-direction:column;flex:1;min-width:0;min-height:0;container-type:inline-size}
.location-bar{display:flex;align-items:center;gap:12px;padding:8px 24px;border-bottom:1px solid var(--border);min-width:0;flex-shrink:0;background:var(--bg)}
.heading-context{display:flex;align-items:baseline;gap:6px;min-width:0;flex:1;overflow-x:auto;white-space:nowrap;font-size:12px;line-height:1.5;scrollbar-width:thin;padding:4px 0}
.heading-context a{max-width:32ch;overflow:hidden;text-overflow:ellipsis;flex-shrink:0;text-decoration-color:var(--border)}
.context-root,.context-divider{color:var(--muted)}
.contents-sidebar{position:relative;flex-shrink:0;min-width:0;min-height:0;display:flex;flex-direction:column;background:var(--panel);border-right:1px solid var(--border);z-index:3}
.contents-sidebar[hidden]{display:none}
.contents-header{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:14px 18px 4px;flex-shrink:0}
.contents-header h2{font-size:16px;font-weight:650;letter-spacing:-.025em}
.contents-header button{font-size:24px;padding:0 8px;min-height:36px}
.contents-position{font-size:11px;color:var(--muted);line-height:1.6;padding:0 20px 14px;flex-shrink:0}
.contents-position progress{display:block;appearance:none;width:100%;height:4px;margin:10px 0 0;border:0;background:var(--border);border-radius:4px;overflow:hidden}
.contents-position progress::-webkit-progress-bar{background:var(--border)}
.contents-position progress::-webkit-progress-value{background:#829f29}
.contents-position progress::-moz-progress-bar{background:#829f29}
.contents-scroll{overflow:auto;min-height:0;flex:1;overscroll-behavior:contain;scrollbar-gutter:stable;padding:0 10px 24px}
.contents-tree{list-style:none;padding:0;margin:0;min-width:0}
.contents-tree .contents-tree{padding-left:12px;border-left:1px solid var(--border);margin-left:10px}
.contents-link{transition:none;display:flex;align-items:baseline;gap:8px;padding:9px 10px;margin:2px 0;border-radius:6px;text-decoration:none;font-size:12px;line-height:1.45;overflow-wrap:anywhere}
.contents-link:hover{background:var(--code)}
.contents-link.is-current{background:var(--accent);color:var(--accent-fg);font-weight:650}
.contents-level{font-size:9px;flex-shrink:0;opacity:.65;font-variant-numeric:tabular-nums}
.contents-empty{padding:8px}
.contents-resize{position:absolute;inset-block:0;right:0;width:10px;cursor:col-resize;touch-action:none;z-index:4;outline-offset:-3px!important}
.contents-resize::after{content:"";position:absolute;right:0;top:0;bottom:0;width:2px;background:transparent}
.contents-resize:hover::after,.contents-resize:focus-visible::after,.resizing-contents .contents-resize::after{background:var(--contents-resize-color,#829f29)}
.resizing-contents,.resizing-contents *{cursor:col-resize!important;user-select:none!important}
.contents-backdrop{position:absolute;inset:0;background:#0005;z-index:2;border-radius:0}
.contents-drawer{position:absolute;inset-block:0;left:0;max-width:calc(100% - 44px);box-shadow:8px 0 24px #0002}
/* A quiet light-only Contents surface: keep shared panels and dark mode intact.
   The narrow current marker and interactive resize edge retain 3:1 contrast. */
.app:not(.theme-dark) .contents-sidebar{background:#f3f2ee;--contents-resize-color:#658519}
.app:not(.theme-dark) .contents-link.is-current{background:#e4e7dc;color:var(--fg);border-inline-start:3px solid #658519;padding-inline-start:7px}
.app:not(.theme-dark) .contents-level{color:var(--muted);opacity:1}
@container (max-width:620px){.location-bar{padding:6px 12px;gap:6px}.location-bar>.quiet{padding-inline:8px}.heading-context{font-size:11px}.heading-context a{max-width:24ch}}
@media(forced-colors:active){.contents-link.is-current{outline:2px solid Highlight}.contents-resize::after{background:ButtonText}}

/* GitHub-like fenced-code palettes. Theme switches are CSS-only: no retokenizing
   or DOM replacement, so a selection and native code scrolling stay intact. */
.markdown pre.code-block{background:#fff;color:#1f2328;max-height:70dvh}
.theme-dark .markdown pre.code-block{background:#0d1117;color:#e6edf3}
syntax-code{display:contents}
syntax-code span{color:var(--syntax-light)}
.theme-dark syntax-code span{color:var(--syntax-dark)}

/* Resize controls occupy their own narrow grid cells: never an overlay on links,
   selectable prose, code or the scrollbar. Remaining margins stay navigable. */
.slide-stage-resizable{grid-template-columns:minmax(14px,1fr) 10px minmax(0,var(--reading-width,924px)) 10px minmax(14px,1fr)}
.reading-resize{position:relative;min-width:0;cursor:col-resize;touch-action:none;outline-offset:-2px!important;user-select:none}
.reading-resize::after{content:"";position:absolute;inset-block:12px;left:4px;width:2px;background:transparent;border-radius:2px}
.reading-resize:hover::after,.reading-resize:focus-visible::after,.resizing-reading .reading-resize::after{background:#829f29;opacity:.55}
.reading-resize:focus-visible::after{opacity:1}
.resizing-reading,.resizing-reading *{cursor:col-resize!important;user-select:none!important}
@media(forced-colors:active){.reading-resize:focus-visible::after,.reading-resize:hover::after{background:Highlight}}

/* Intrinsic-size Mermaid SVGs stay readable instead of shrinking wide diagrams. */
mermaid-diagram{display:block;min-width:0;max-width:100%;margin:1.1em 0;border:1px solid var(--border);border-radius:9px;background:var(--panel);overflow:hidden}
.diagram-status{padding:12px 14px;font-size:13px!important;margin:0!important}
.diagram-scroll{max-width:100%;max-height:70dvh;overflow:auto;overscroll-behavior-x:contain;padding:16px;outline-offset:-4px!important}
.mermaid-frame{display:block;border:0;max-width:none;background:transparent;pointer-events:none}
.diagram-source{border-top:1px solid var(--border);font-size:13px}
.diagram-source summary{cursor:pointer;padding:12px 14px;font-weight:600}
.diagram-source summary:focus-visible{outline:3px solid #658519;outline-offset:-4px}
.diagram-source .code-block{margin:0;border-radius:0;font-size:14px}

/* One native dialog keeps the same iframe mounted inline and in the top layer. */
.diagram-viewer{position:static;inset:auto;margin:0;padding:0;border:0;width:100%;max-width:none;max-height:none;overflow:visible;color:var(--fg);background:var(--panel)}
.diagram-toolbar{display:none}
.diagram-actions{display:flex;justify-content:flex-end;padding:4px 10px 10px}
.diagram-actions[hidden]{display:none}
.diagram-expand{font-size:12px;border-color:var(--border);min-height:36px}
.diagram-viewer[data-fullscreen]{position:fixed;inset:0;box-sizing:border-box;margin:0;width:100%;height:100dvh;max-height:100dvh;display:flex;flex-direction:column;overflow:hidden;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);font-size:16px;line-height:1.5}
.diagram-viewer[data-fullscreen]::backdrop{background:rgb(0 0 0 / .65)}
.diagram-viewer[data-fullscreen] .diagram-toolbar{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;padding:12px 16px;border-bottom:1px solid var(--border);flex-shrink:0}
.diagram-close{min-height:44px;border-color:var(--border)}
.diagram-viewer[data-fullscreen] .diagram-status{flex-shrink:0}
.diagram-viewer[data-fullscreen] .diagram-scroll{flex:1;min-height:0;max-height:none;width:100%;overscroll-behavior:contain;touch-action:pan-x pan-y pinch-zoom}