/* Algorithmics source: computational-style touch control and shared theme tokens. */
:root{--page:#fff;--ink:#151515;--muted:#555;--bar:#151515;--bar-ink:#fff;--panel:#fff;--line:#aaa;--soft:#f1f1f1;--viewport:#ededed}
:root[data-theme="dark"]{--page:#151515;--ink:#f5f5f5;--muted:#c8c8c8;--bar:#f5f5f5;--bar-ink:#151515;--panel:#202020;--line:#707070;--soft:#2d2d2d;--viewport:#292929}
html,body{background:var(--page);color:var(--ink)}
/* All public titles share the restrained half-scale; pages differ by content, not heading scale. */
h1{font-size:clamp(1.2rem,3vw,2.3rem)!important;line-height:.9!important}
.page-control.theme-toggle{position:fixed;right:20px;bottom:20px;z-index:1000;width:48px;height:48px;margin:0;padding:0;border:1px solid var(--ink);border-radius:50%;display:grid;place-items:center;background:var(--bar);color:var(--bar-ink);cursor:pointer;box-shadow:0 2px 10px rgb(0 0 0 / .18);transition:transform .16s ease,background-color .16s ease,color .16s ease}
.page-control.theme-toggle:hover{transform:scale(1.06)}
.page-control.theme-toggle:focus-visible{outline:2px solid var(--ink);outline-offset:4px}
.page-control-disc{width:30px;height:30px;display:grid;place-items:center}
.theme-icon{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.25}.theme-icon-fill{fill:currentColor;stroke:none}
:root[data-theme="dark"] :is(input:not([type="range"]),select,textarea,fieldset,#controls,.work>form,button:not(.page-control),.view button,.export,.pick-restore){background-color:var(--panel);color:var(--ink);border-color:var(--line)}
:root[data-theme="dark"] :is(p,label,output,.note,.info,.meta,.heading p){color:var(--muted)!important}
:root[data-theme="dark"] :is(.viewport,#viewport){background:var(--viewport)}
/* Paper and exported SVG/PNG stages retain their physical white-paper contract. */
:root[data-theme="dark"] :is(.paper,#paper-preview,svg){color-scheme:light}
@media (prefers-reduced-motion:reduce){.page-control.theme-toggle{transition:none}}