/* Playroom: model cards, the tabbed workbench, controls, charts, and the "How it was built" log. */

/* ---------- guided tour ---------- */
.prspot { position: fixed; z-index: 88; border-radius: 14px; pointer-events: none; box-shadow: 0 0 0 3px var(--hi), 0 0 0 9999px rgba(8, 12, 16, .5); }
.prspot.none { box-shadow: 0 0 0 9999px rgba(8, 12, 16, .5); }
.prtourb { position: fixed; z-index: 89; width: min(370px, calc(100vw - 24px)); max-height: calc(100vh - 24px); overflow: auto; background: var(--surface); color: var(--ink); border: 2px solid var(--ink); border-radius: 18px; padding: 14px 16px; box-shadow: 0 18px 50px rgba(0, 0, 0, .3); font-size: .95rem; outline: none; }
.prtourb:focus, .prtourb:focus-visible { outline: none; }
.prtourb.big { width: min(430px, calc(100vw - 24px)); }
.prtourb.dock { left: 10px; right: 10px; top: auto; bottom: calc(10px + env(safe-area-inset-bottom, 0px)); width: auto; max-height: 46vh; }
.prtb-head { display: flex; gap: 10px; align-items: center; }
.prtb-head .mascot { flex: none; }
.prtb-step { font: 700 .72rem var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.prtourb h4 { font: 800 1.12rem/1.2 var(--f-display); margin: 2px 0 0; }
.prtourb p { margin: 8px 0 0; }
.prtb-task { background: color-mix(in srgb, var(--hi) 24%, var(--surface)); border-radius: 12px; padding: 8px 11px; }
.prtb-task.ok { background: var(--good-bg); }
.prtb-away { display: none; font-size: .9rem; background: var(--surface2); border-radius: 10px; padding: 6px 10px; }
.prtourb.away .prtb-away { display: block; }
.prtb-foot { display: flex; align-items: center; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.prtb-foot .grow { flex: 1; }
.prtb-foot .btn svg { width: 16px; height: 16px; }
@keyframes prpulse { 50% { transform: scale(1.07); } }
.prtb-next.go { animation: prpulse 1.1s ease-in-out infinite; }
.prtourbtn svg { width: 17px; height: 17px; }
@media (max-width: 560px) { .prw .phead > .tag { display: none; } }

/* ---------- home ---------- */
.prgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.prcard { text-align: left; border: 1.5px solid var(--line); background: var(--surface); border-radius: 18px; padding: 14px; cursor: pointer; display: grid; gap: 8px; align-content: start; box-shadow: 0 3px 0 var(--line); transition: transform .1s; color: var(--ink); font: inherit; }
.prcard:hover { transform: translateY(-2px); }
.prcard h3 { font-size: 1.2rem; }
.prcard p { margin: 0; color: var(--muted); font-size: .94rem; }
.prcard .prhow { font-size: .78rem; letter-spacing: .02em; }
.prart svg { display: block; width: 100%; height: auto; }
.prart img { display: block; width: 100%; height: auto; aspect-ratio: 220 / 120; border-radius: 14px; background: var(--surface2); }
.prtags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag.tier-yours { background: color-mix(in srgb, var(--good) 18%, var(--surface)); color: var(--ink); font-weight: 700; }
.tag.tier-ours { background: color-mix(in srgb, var(--cd) 18%, var(--surface)); color: var(--ink); font-weight: 700; }
.tag.tier-recorded { background: color-mix(in srgb, var(--cb) 18%, var(--surface)); color: var(--ink); font-weight: 700; }
.prshelf { margin-bottom: 30px; }
.prshelf > h2 { font-size: 1.35rem; font-weight: 800; letter-spacing: -.01em; }
.prshelf > p { margin: .3em 0 14px; color: var(--muted); max-width: 70ch; }
.prshelf > .gl-deeper { margin-top: 14px; }
.prshelf > .btn { margin-top: 12px; }
.prcard .gl-prq { color: var(--ink); font-weight: 700; }
.gl-studied { padding-left: 1.1em; display: grid; gap: 8px; }

/* ---------- workbench ---------- */
.prw .phead { max-width: 1080px; }
.prw .phead h2 { font-size: 1.2rem; flex: 1; min-width: 0; }
.prtabs { display: flex; gap: 4px; max-width: 1080px; width: 100%; margin: 0 auto; padding: 0 16px; overflow-x: auto; border-bottom: 1.5px solid var(--line); scrollbar-width: none; }
.prtab { border: 0; background: none; font: 700 .95rem var(--f-body); color: var(--muted); padding: 10px 14px; border-bottom: 3px solid transparent; margin-bottom: -1.5px; cursor: pointer; white-space: nowrap; }
.prtab[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--ca); }
.prtab:hover { color: var(--ink); }
@media (max-width: 560px) { .prtabs { flex-wrap: wrap; overflow: visible; gap: 2px; } .prtab { padding: 8px 9px; font-size: .88rem; } }
.prpanel { max-width: 1080px; margin: 0 auto; padding: 18px 0 40px; animation: rise .25s ease-out; }
.prload { padding: 40px 0; text-align: center; }
.prlead { font-size: 1.05rem; max-width: 72ch; margin: 0 0 16px; }
.prcols { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; align-items: start; }
.prcols-in { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); }
@media (max-width: 860px) { .prcols, .prcols-in { grid-template-columns: 1fr; } }
.prbox { background: var(--surface); border: 1.5px solid var(--line); border-radius: 18px; padding: 16px; min-width: 0; }
.prbox + .prbox { margin-top: 0; }
.prsticky { position: sticky; top: 8px; }
@media (max-width: 860px) { .prsticky { position: static; } }
.prbox h4 { font: 700 .95rem var(--f-display); margin: 14px 0 8px; }
.prbox h4:first-child { margin-top: 0; }
.prbox h4 small { font: 500 .8rem var(--f-body); }
.prsec h3 { font-size: 1.05rem; }
.prsec p { margin: 4px 0 10px; font-size: .92rem; }
.prctrl { display: grid; gap: 12px; margin-bottom: 12px; }
.prrow { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 10px; }
.prrow .btn svg { width: 16px; height: 16px; }
.prstatus { margin: 4px 0 14px; font-size: .95rem; min-height: 1.5em; }
.prstatus .bad { color: var(--bad); }
.prnote { font-size: .9rem; background: var(--surface2); border-radius: 10px; padding: 8px 10px; margin: 10px 0 0; }

/* controls */
.prsl { display: grid; gap: 2px; margin: 8px 0 10px; }
.prsl label { display: flex; justify-content: space-between; gap: 10px; font-weight: 700; font-size: .92rem; }
.prsl label b { font-weight: 700; color: var(--ca); white-space: nowrap; }
.prsl small { font-size: .8rem; }
.prseg { display: grid; gap: 6px; }
.prlab { font-weight: 700; font-size: .92rem; }
.prtogs { display: flex; flex-wrap: wrap; gap: 6px; }
.prtog { border: 1.5px solid var(--line); background: var(--surface); color: var(--muted); border-radius: 99px; padding: 6px 12px; font: 700 .88rem var(--f-body); cursor: pointer; }
.prtog[aria-pressed="true"] { background: color-mix(in srgb, var(--ca) 14%, var(--surface)); border-color: var(--ca); color: var(--ink); }
.prmets { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 8px; margin: 10px 0; }
.prmet { background: var(--surface2); border-radius: 12px; padding: 10px 12px; display: grid; gap: 2px; }
.prmet span { font: 700 .72rem var(--f-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.prmet b { font-size: 1.35rem; }
.prmet small { font-size: .8rem; color: var(--muted); }

/* outputs */
.prout { display: grid; gap: 2px; margin-bottom: 8px; }
.prk { font: 700 .74rem var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.prbig { font: 800 clamp(2rem, 5vw, 2.8rem)/1.1 var(--f-display); letter-spacing: -.02em; }
.prbig.spam { color: var(--cb); } .prbig.ham { color: var(--good); }
.prsub { font-size: .92rem; color: var(--muted); }
.prsum { text-align: right; margin: 6px 0 0; font-size: .95rem; }
.prwhy { border-top: 1.5px dashed var(--line); padding-top: 10px; margin-top: 8px; }
.prmap { border-top: 1.5px dashed var(--line); padding-top: 10px; margin-top: 12px; }
.prmap .prchart { max-width: 260px; margin: 0 auto; }
.prchart.prmapsvg, .fig.prfig .prchart.prmapsvg { max-width: 280px; }
.prlegend { display: flex; align-items: center; justify-content: center; gap: 8px; font-size: .8rem; color: var(--muted); }
.prlegend i { width: 90px; height: 8px; border-radius: 99px; background: linear-gradient(90deg, var(--ca), var(--cb)); }

/* charts */
.prchart { display: block; width: 100%; height: auto; }
.prbars { display: grid; gap: 4px; }
.prbar { display: grid; grid-template-columns: minmax(2.2em, max-content) 1fr 3.6em; gap: 8px; align-items: center; font-size: .9rem; }
.prbar .track { height: 14px; background: var(--surface2); border-radius: 99px; overflow: hidden; }
.prbar .track i { display: block; height: 100%; background: color-mix(in srgb, var(--ca) 45%, var(--surface)); border-radius: 99px; transition: width .15s; }
.prbar.on .track i { background: var(--cb); }
.prbar.on .lab, .prbar.on b { color: var(--ink); font-weight: 800; }
.prbar b { text-align: right; font-size: .82rem; color: var(--muted); }
.prdiv { display: grid; gap: 4px; }
.prdrow { display: grid; grid-template-columns: minmax(6em, 38%) 1fr 4.4em; gap: 8px; align-items: center; font-size: .9rem; border-radius: 8px; padding: 1px 4px; }
.prdrow .lab { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.prdrow .lab small { color: var(--muted); }
.prdrow .track { position: relative; height: 14px; background: var(--surface2); border-radius: 4px; }
.prdrow .track::after { content: ""; position: absolute; left: 50%; top: -2px; bottom: -2px; width: 1.5px; background: var(--muted); }
.prdrow .track i { position: absolute; top: 0; bottom: 0; border-radius: 3px; transition: width .15s, left .15s; }
.prdrow i.pos { background: var(--cb); } .prdrow i.neg { background: var(--ca); }
.prdrow b { text-align: right; font-size: .82rem; }
.prdrow.off { opacity: .4; }
.prdrow[role="button"] { cursor: pointer; }
.prdrow[role="button"]:hover, .prdrow.sel { background: var(--surface2); }
.prdrow.sel { box-shadow: inset 0 0 0 1.5px var(--ca); }

/* ---------- spam ---------- */
.prmeter { position: relative; height: 12px; background: var(--surface2); border-radius: 99px; margin: 8px 0 4px; }
.prmeter i { position: absolute; left: 0; top: 0; bottom: 0; background: linear-gradient(90deg, var(--ca), var(--cb)); border-radius: 99px; }
.prmeter em { position: absolute; top: -4px; bottom: -4px; width: 3px; background: var(--ink); border-radius: 2px; }
.prmsg { line-height: 2.1; font-size: 1rem; margin: 6px 0; overflow-wrap: anywhere; }
.prwt { border: 0; font: inherit; color: var(--ink); padding: 2px 3px; border-radius: 6px; cursor: pointer; }
.prwt.sel { outline: 2.5px solid var(--ink); }
.prw0 { color: var(--muted); }
.prkey { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -1px; margin: 0 4px 0 10px; }
.prkey:first-child { margin-left: 0; }
.prkey.spam { background: color-mix(in srgb, var(--cb) 70%, var(--surface)); } .prkey.ham { background: color-mix(in srgb, var(--ca) 70%, var(--surface)); } .prkey.none { background: var(--surface2); box-shadow: inset 0 0 0 1px var(--line); }
.predit { background: var(--surface2); border-radius: 14px; padding: 12px; margin: 10px 0; }
.predit p { margin: 0 0 6px; }
.prfind { width: 100%; font: 1rem var(--f-body); padding: 10px 12px; border-radius: 12px; border: 2px solid var(--line); background: var(--surface); color: var(--ink); }
.prlists { display: grid; grid-template-columns: 1fr; gap: 6px; margin-top: 10px; }
.prcm { display: grid; grid-template-columns: auto 1fr 1fr; gap: 6px; align-items: stretch; margin: 12px 0; font-size: .88rem; }
.prcm .h { font: 700 .74rem var(--f-mono); letter-spacing: .04em; text-transform: uppercase; color: var(--muted); display: flex; align-items: center; justify-content: center; text-align: center; }
.prcm b { display: grid; place-items: center; font: 800 1.4rem var(--f-mono); padding: 8px; border-radius: 12px; }
.prcm b small { font: 600 .74rem var(--f-body); color: var(--muted); }
.prcm b.ok { background: var(--good-bg); } .prcm b.no { background: var(--bad-bg); }
.tag.spam { background: color-mix(in srgb, var(--cb) 25%, var(--surface)); color: var(--ink); font-weight: 700; }
.tag.ham { background: color-mix(in srgb, var(--good) 22%, var(--surface)); color: var(--ink); font-weight: 700; }
.prq { margin: 8px 0; padding: 8px 12px; border-left: 4px solid var(--line); background: var(--surface2); border-radius: 8px; font-size: .93rem; }
.prex { font-style: italic; }
.prtok { display: inline-block; font: 600 .85rem var(--f-mono); background: var(--surface2); border: 1.5px solid var(--line); border-radius: 8px; padding: 2px 7px; margin: 2px 0; }
.prbag { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.prbag span { display: inline-flex; align-items: center; gap: 6px; border: 1.5px solid var(--line); border-radius: 10px; padding: 3px 4px 3px 9px; font-size: .88rem; }
.prbag i { font: 700 .85rem var(--f-mono); font-style: normal; border-radius: 6px; padding: 1px 7px; }
.prbag i.y { background: var(--hi); color: var(--hi-ink); } .prbag i.n { background: var(--surface2); color: var(--muted); }

/* ---------- digits ---------- */
.prpad { width: min(280px, 100%); aspect-ratio: 1; margin: 6px auto; }
.prpad canvas { display: block; width: 100%; height: 100%; background: var(--surface2); border: 2px dashed var(--line); border-radius: 16px; touch-action: none; cursor: crosshair; }
.prpx { image-rendering: pixelated; border-radius: 6px; box-shadow: inset 0 0 0 1px var(--line); display: block; }
.prstrip { display: flex; flex-wrap: wrap; gap: 6px; }
.prdig { padding: 2px; border: 1.5px solid var(--line); border-radius: 9px; background: var(--surface); cursor: pointer; }
.prdig:hover { border-color: var(--ca); }
.prsees { border-top: 1.5px dashed var(--line); padding-top: 10px; margin-top: 12px; }
.prlayer + .prlayer { border-top: 1.5px dashed var(--line); padding-top: 10px; margin-top: 12px; }
.prmaps { display: flex; flex-wrap: wrap; gap: 8px; }
.prmap { display: grid; gap: 4px; justify-items: center; padding: 4px; border-radius: 10px; }
.prmap.sel { background: color-mix(in srgb, var(--ca) 14%, var(--surface)); box-shadow: inset 0 0 0 1.5px var(--ca); }
.prfilt { padding: 0; border: 0; background: none; cursor: pointer; border-radius: 6px; }
.prfilt:hover .prpx, .prfilt[aria-pressed="true"] .prpx { box-shadow: 0 0 0 2.5px var(--ca); }
.prmap2 { padding: 2px; border: 1.5px solid var(--line); border-radius: 8px; background: var(--surface); cursor: pointer; }
.prmap2.off { opacity: .3; border-style: dashed; }
.prgrid5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: 4px; max-width: 250px; margin: 8px 0 10px; touch-action: none; }
.prw5 { aspect-ratio: 1; border: 1px solid var(--line); border-radius: 6px; font: 600 .74rem var(--f-mono); color: var(--ink); cursor: pointer; padding: 0; user-select: none; }
.prdigits { gap: 6px; }
.prmiss { display: grid; justify-items: center; gap: 2px; font-size: .8rem; }
.prconf { display: grid; grid-template-columns: repeat(11, minmax(22px, 1fr)); gap: 2px; max-width: 420px; margin: 10px 0; font: 600 .74rem var(--f-mono); }
.prconf span { aspect-ratio: 1; display: grid; place-items: center; border-radius: 4px; }
.prconf .h { color: var(--muted); }
.prarch { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 10px 0; }
.prarch span { display: grid; justify-items: center; background: var(--surface2); border-radius: 10px; padding: 6px 10px; }
.prarch b { font-size: .85rem; } .prarch small { font-size: .74rem; color: var(--muted); }
.prarch i { color: var(--muted); font-style: normal; }

/* ---------- how it was built ---------- */
.prlog { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; counter-reset: none; }
.prstep { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 14px; position: relative; padding-bottom: 22px; }
.prstep::before { content: ""; position: absolute; left: 19px; top: 40px; bottom: 0; width: 2px; background: var(--line); }
.prstep:last-child::before { display: none; }
.prnum { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; background: var(--hi); color: var(--hi-ink); font: 800 1rem var(--f-mono); position: relative; z-index: 1; }
.prsb h3 { font-size: 1.15rem; margin: 8px 0 6px; }
.prsb .prose p:first-child { margin-top: 0; }
.fig.prfig svg { min-width: 0; max-width: 100%; }
.fig.prfig .prchart { max-width: 520px; margin: 0 auto; }
.prfig .prmaps { justify-content: center; }
@media (max-width: 360px) { .fig.prfig { padding-left: 4px; padding-right: 4px; } }   /* a lesson picture's narrow drawing keeps its words at 11px */
.prfoot { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; margin-top: 8px; }
@media (max-width: 860px) { .prfoot { grid-template-columns: 1fr; } }
.prcred, .prlinks { background: var(--surface); border: 1.5px solid var(--line); border-radius: 16px; padding: 14px 16px; font-size: .92rem; }
.prcred h3, .prlinks h3 { font-size: 1rem; margin: 0 0 8px; }
.prlinks h3 + * { margin-bottom: 12px; }
.prcred p { margin: 0 0 8px; }
.prcred code { font-family: var(--f-mono); font-size: .86em; background: var(--surface2); padding: 1px 5px; border-radius: 5px; }
.prchips { display: flex; flex-wrap: wrap; gap: 6px; }
.prchip { display: inline-flex; align-items: center; gap: 6px; border: 1.5px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 12px; padding: 6px 10px; font: 600 .88rem var(--f-body); cursor: pointer; text-align: left; }
.prchip:hover { border-color: var(--ca); }
.prdone { color: var(--good); font-weight: 800; }
.prchip.locked { color: var(--muted); }
.prlock svg { width: 14px; height: 14px; vertical-align: -2px; }
.prpaper { display: flex; gap: 10px; align-items: center; width: 100%; border: 1.5px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 12px; padding: 10px 12px; margin-bottom: 6px; cursor: pointer; text-align: left; font: inherit; }
.prpaper:hover { border-color: var(--ca); }
.prpaper svg { width: 22px; height: 22px; flex: none; color: var(--ca); }
.prpaper span { display: grid; } .prpaper small { color: var(--muted); font-size: .8rem; }

/* ---------- touch targets: 44×44px on phones and touch screens ---------- */
@media (pointer: coarse), (max-width: 760px) {
  .prtog, .prchip, .prdrow[role="button"] { min-height: 44px; }
  .prtab { min-height: 46px; }   /* at least 44px showing: each tab tucks 1.5px under the bar's bottom border */
}