/* THE FORGE, static edition. Ported from shiny-apps/_forge_template/www/custom.css
   so this page sits beside the Shiny apps and looks like one of them. */

:root {
  --charcoal: #2D2D2D;
  --dark-bg: #1E1E1E;
  --card-bg: #363636;
  --gold: #C5A55A;
  --ember: #E8723A;
  --steel: #8A9DAF;
  --warm-white: #F5F0E6;
  --muted: #A0A0A0;
  --border: #444444;
  --green: #4CAF50;
  --red: #E74C3C;
  --blue: #4A90D9;
}

* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  background: var(--charcoal);
  color: var(--warm-white);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}
a { color: var(--gold); }
code, pre, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

/* ---------- navbar ---------- */
.navbar {
  background: var(--dark-bg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: 62px;
  flex-wrap: wrap;
}
.forge-brand { display: flex; align-items: center; line-height: 1; margin-right: 8px; }
.forge-logo { position: relative; width: 95px; height: 62px; flex-shrink: 0; overflow: visible; }
.forge-anvil { position: absolute; top: 0; left: 0; width: 95px; height: auto; z-index: 2;
  filter: drop-shadow(0 0 5px rgba(232,114,58,0.5)); }
.forge-fire { position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: auto; height: 62px; z-index: 3; opacity: 0.9; }
.forge-text { display: flex; align-items: baseline; gap: 6px; padding-left: 8px; }
.forge-title { color: var(--gold); font-weight: 800; font-size: 1.1em; letter-spacing: 1px; }
.forge-subtitle { color: var(--steel); font-weight: 400; font-size: 0.85em; }

.nav { display: flex; gap: 2px; flex-wrap: wrap; flex: 1; }
.nav button {
  background: none; border: none; border-bottom: 2px solid transparent;
  color: var(--muted); font: inherit; font-weight: 500; text-transform: uppercase;
  font-size: 0.78em; letter-spacing: 0.5px; padding: 10px 10px; cursor: pointer;
}
.nav button:hover { color: var(--warm-white); }
.nav button.active { color: var(--gold); border-bottom-color: var(--gold); }
.nav button .num { color: var(--ember); font-weight: 700; margin-right: 4px; }
.nav button .bar { color: var(--steel); font-weight: 400; margin: 0 1px; }  /* the conditioning bar, standing in for the word */
.nav-right a { color: var(--steel); font-size: 0.8em; text-decoration: none; }

/* ---------- tabs ---------- */
.tab { display: none; }
.tab.active { display: grid; grid-template-columns: 290px 1fr; min-height: calc(100vh - 62px); }
@media (max-width: 960px) { .tab.active { grid-template-columns: 1fr; } }

.sidebar {
  background: var(--dark-bg);
  border-right: 1px solid var(--border);
  padding: 18px 16px 90px 16px;
}
.sidebar h2 { color: var(--gold); font-size: 0.85em; text-transform: uppercase; letter-spacing: 0.5px; margin: 0 0 6px; }
.sidebar .says { color: var(--warm-white); font-size: 0.92em; margin: 0 0 14px; }
.sidebar .says .katex { font-size: 1em; }
.sidebar label { display: block; color: var(--gold); font-weight: 600; font-size: 0.78em; text-transform: uppercase; letter-spacing: 0.3px; margin: 14px 0 6px; }
.dial-value { display: flex; justify-content: space-between; align-items: baseline; color: var(--warm-white); font-size: 0.9em; margin-top: 4px; }
.dial-value .val { font-weight: 700; color: var(--warm-white); }
.file-badge { display: inline-block; background: var(--ember); color: #fff; padding: 2px 9px; border-radius: 12px; font-size: 0.72em; font-weight: 700; letter-spacing: 0.3px; visibility: hidden; }
.file-badge.on { visibility: visible; }
.ticks { display: flex; justify-content: space-between; color: var(--muted); font-size: 0.7em; margin-top: 2px; }

input[type=range] { width: 100%; -webkit-appearance: none; appearance: none; background: transparent; margin: 6px 0 0; }
input[type=range]::-webkit-slider-runnable-track { height: 6px; background: linear-gradient(90deg, var(--gold) var(--pct, 0%), #555 var(--pct, 0%)); border-radius: 3px; }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; border-radius: 50%; background: var(--ember); border: 2px solid var(--dark-bg); margin-top: -7px; cursor: pointer; box-shadow: 0 0 0 2px rgba(232,114,58,0.35); }
input[type=range]::-moz-range-track { height: 6px; background: #555; border-radius: 3px; }
input[type=range]::-moz-range-progress { height: 6px; background: var(--gold); border-radius: 3px; }
input[type=range]::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: var(--ember); border: 2px solid var(--dark-bg); cursor: pointer; }

.check { display: flex; align-items: center; gap: 8px; color: var(--warm-white); font-size: 0.88em; margin: 8px 0; cursor: pointer; text-transform: none; font-weight: 400; letter-spacing: 0; }
.check input { accent-color: var(--gold); width: 16px; height: 16px; }
.radios { display: flex; gap: 6px; }
.radios button { flex: 1; background: #404040; border: 1px solid #555; color: var(--warm-white); font: inherit; font-size: 0.82em; padding: 5px 0; border-radius: 4px; cursor: pointer; }
.radios button.active { background: var(--gold); color: var(--dark-bg); border-color: var(--gold); font-weight: 700; }

.callout { border-left: 3px solid var(--steel); padding: 10px 14px; margin: 10px 0; background: rgba(255,255,255,0.03); border-radius: 4px; color: var(--warm-white); font-size: 0.88em; }
.callout.warning { border-left-color: var(--ember); }
.callout.success { border-left-color: var(--green); }
.callout.gold { border-left-color: var(--gold); }
.callout em { color: var(--gold); font-style: normal; }

/* ---------- main ---------- */
.main { padding: 16px; display: grid; gap: 14px; grid-template-columns: repeat(12, 1fr); align-content: start; }
.card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px; box-shadow: 0 2px 8px rgba(0,0,0,0.3); display: flex; flex-direction: column; min-width: 0; }
.card.look { border-color: var(--gold); box-shadow: 0 0 0 1px var(--gold), 0 2px 12px rgba(197,165,90,0.25); }
.card-header { background: rgba(197,165,90,0.12); border-bottom: 1px solid var(--border); padding: 8px 14px; font-weight: 600; font-size: 0.8em; text-transform: uppercase; letter-spacing: 0.5px; color: var(--gold); display: flex; justify-content: space-between; align-items: center; }
.card-header .tag { background: var(--gold); color: var(--dark-bg); font-size: 0.85em; padding: 1px 8px; border-radius: 10px; letter-spacing: 0.3px; }
.card-body { padding: 10px 14px 12px; flex: 1; }
.span-12 { grid-column: span 12; } .span-8 { grid-column: span 8; } .span-7 { grid-column: span 7; } .span-6 { grid-column: span 6; }
.span-5 { grid-column: span 5; } .span-4 { grid-column: span 4; }
@media (max-width: 1250px) { .span-4 { grid-column: span 6; } .span-7, .span-5, .span-8 { grid-column: span 12; } }
@media (max-width: 760px) { .span-4, .span-6 { grid-column: span 12; } }

svg.plot { width: 100%; height: auto; display: block; }
svg.plot text { font-family: "Inter", sans-serif; }
.plot-note { color: var(--muted); font-size: 0.78em; margin-top: 6px; }

pre.printout { margin: 0; color: var(--warm-white); font-size: 0.74em; line-height: 1.45; white-space: pre-wrap; overflow-x: auto; background: #2a2a2a; border: 1px solid var(--border); border-radius: 4px; padding: 10px 12px; }
pre.printout .hit { color: var(--ember); font-weight: 700; }
pre.printout .ok { color: var(--green); }

.metric { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding: 7px 0; border-bottom: 1px solid var(--border); }
.metric:last-child { border-bottom: none; }
.metric .lab { color: var(--muted); font-size: 0.8em; text-transform: uppercase; letter-spacing: 0.3px; }
.metric .val { font-weight: 700; font-size: 1.05em; color: var(--warm-white); white-space: nowrap; }
.metric .val.gold { color: var(--gold); } .metric .val.ember { color: var(--ember); } .metric .val.green { color: var(--green); } .metric .val.steel { color: var(--steel); } .metric .val.blue { color: var(--blue); }
.metric .sub { color: var(--muted); font-size: 0.72em; display: block; text-transform: none; letter-spacing: 0; }
.metric .sub sub { font-size: 0.8em; }

.verdict { text-align: center; padding: 10px; margin-bottom: 10px; border-radius: 6px; background: rgba(255,255,255,0.04); border: 1px solid var(--steel); }
.verdict .lab { font-weight: 700; font-size: 1.05em; }
.verdict .msg { color: var(--muted); font-size: 0.85em; margin-top: 2px; }
.verdict.good { border-color: var(--green); } .verdict.good .lab { color: var(--green); }
.verdict.warn { border-color: var(--gold); } .verdict.warn .lab { color: var(--gold); }
.verdict.bad { border-color: var(--ember); } .verdict.bad .lab { color: var(--ember); }

.question p { margin: 6px 0; }
.btn { background: var(--ember); border: none; color: var(--warm-white); font: inherit; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; font-size: 0.8em; padding: 7px 14px; border-radius: 4px; cursor: pointer; }
.btn:hover { background: #D4622E; }
.answer { display: none; margin-top: 10px; padding: 10px 14px; border-left: 3px solid var(--green); background: rgba(76,175,80,0.08); border-radius: 4px; }
.answer.open { display: block; }

.memo { font-style: italic; color: var(--warm-white); }

/* ---------- blueprint ---------- */
.blueprint-fab { position: fixed; bottom: 20px; right: 20px; z-index: 1040; background: rgba(197,165,90,0.9); color: var(--dark-bg); border: none; border-radius: 24px; padding: 10px 18px; font: inherit; font-weight: 700; font-size: 0.8em; letter-spacing: 0.5px; cursor: pointer; box-shadow: 0 3px 12px rgba(0,0,0,0.4); transition: all 0.2s ease; }
.blueprint-fab:hover { background: var(--gold); transform: translateY(-1px); }
.offcanvas { position: fixed; top: 0; right: 0; height: 100%; width: 440px; max-width: 92vw; background: var(--dark-bg); border-left: 2px solid var(--gold); z-index: 1050; transform: translateX(100%); transition: transform 0.25s ease; display: flex; flex-direction: column; }
.offcanvas.open { transform: translateX(0); }
.offcanvas-header { background: rgba(197,165,90,0.08); border-bottom: 1px solid rgba(197,165,90,0.2); padding: 14px 20px; display: flex; justify-content: space-between; align-items: center; }
.offcanvas-title { color: var(--gold); font-size: 0.9em; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; }
.offcanvas-close { background: none; border: none; color: var(--warm-white); font-size: 1.3em; cursor: pointer; }
.blueprint-content { padding: 18px 20px; color: var(--warm-white); font-size: 0.9em; line-height: 1.7; overflow-y: auto; }
.blueprint-content h5 { color: var(--gold); font-size: 0.85em; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; margin: 16px 0 8px; border-bottom: 1px solid rgba(197,165,90,0.2); padding-bottom: 4px; }
.blueprint-content h5:first-child { margin-top: 0; }
.blueprint-content p { margin: 6px 0; }
.blueprint-eq { background: rgba(255,255,255,0.04); border-left: 3px solid var(--gold); border-radius: 0 4px 4px 0; padding: 10px 16px; margin: 8px 0; overflow-x: auto; }
.blueprint-content .katex { color: var(--warm-white); }
.backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.45); z-index: 1045; display: none; }
.backdrop.open { display: block; }

.footer { color: var(--muted); font-size: 0.78em; padding: 14px 16px 70px; border-top: 1px solid var(--border); background: var(--dark-bg); }
.footer a { color: var(--steel); }

.anvil-dials label { margin-top: 10px; }
.anvil-dials .ticks span:nth-child(2) { color: var(--warm-white); }
.planted { color: var(--muted); font-size: 0.82em; margin-top: 10px; }
.planted b { color: var(--gold); }

/* the dial's "this notch is the cadet file" marker */
.track-wrap { position: relative; padding: 0 10px; }
.file-tick { position: absolute; top: 20px; width: 2px; height: 9px; background: var(--ember); transform: translateX(-50%); margin-left: 0; }
.span-3 { grid-column: span 3; }
@media (max-width: 1250px) { .span-3 { grid-column: span 6; } }
@media (max-width: 760px) { .span-3 { grid-column: span 12; } }

/* ---------- Power and the F ---------- */
.sidebar hr { border: none; border-top: 1px solid var(--border); margin: 16px 0 4px; }
.slider-head { display: flex; justify-content: space-between; align-items: baseline; }
.slider-head label { margin-bottom: 0; }
.slider-head .val { color: var(--warm-white); font-weight: 700; font-size: 0.88em; }
.sidebar label .sym, .metric .lab .sym, .blueprint-content h5 .sym { text-transform: none; }
.sidebar label.check { color: var(--warm-white); font-weight: 400; text-transform: none; letter-spacing: 0; font-size: 0.9em; margin: 12px 0 5px; }
.sidebar .hint { color: var(--muted); font-size: 0.8em; margin: -6px 0 6px; }
.sidebar code, .says code { color: var(--gold); font-size: 0.92em; }
.btn.wide { width: 100%; margin-top: 12px; }
.btn.ghost { background: #404040; border: 1px solid #555; }
.btn.ghost:hover { background: #4a4a4a; }
.btn:disabled { opacity: 0.35; cursor: default; }
.presets { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.presets button { background: #404040; border: 1px solid #555; color: var(--warm-white); font: inherit; font-size: 0.82em; padding: 7px 6px; border-radius: 4px; cursor: pointer; text-align: left; }
.presets button .num { color: var(--ember); font-weight: 700; margin-right: 4px; }
.presets button.active { border-color: var(--gold); box-shadow: 0 0 0 1px var(--gold); background: rgba(197,165,90,0.15); }
.radios button:disabled { opacity: 0.4; cursor: default; }
.radios.chips { margin-top: 8px; }
.hidden { display: none !important; }

/* a control the current step asks the student to touch */
.ctl { border-radius: 6px; transition: box-shadow 0.2s; }
.ctl.glow { box-shadow: 0 0 0 2px var(--gold), 0 0 14px rgba(197,165,90,0.45); padding: 2px 8px 8px; margin: 6px -8px; animation: glow 1.6s ease-in-out infinite; }
@keyframes glow { 50% { box-shadow: 0 0 0 2px var(--gold), 0 0 4px rgba(197,165,90,0.2); } }
@media (prefers-reduced-motion: reduce) { .ctl.glow { animation: none; } }

/* the step card, at the top of the left column beside the controls it names */
.sidebar .guide { background: var(--card-bg); border: 1px solid var(--border); border-left: 4px solid var(--gold); border-radius: 6px; padding: 10px 12px 12px; margin: 6px 0 10px; }
.g-top { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; }
.g-count { color: var(--ember); font-weight: 800; font-size: 0.74em; text-transform: uppercase; letter-spacing: 0.6px; }
.g-dots { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
.g-dot { width: 10px; height: 10px; border-radius: 50%; border: 1.5px solid var(--gold); background: transparent; padding: 0; cursor: pointer; }
.g-dot.done { background: rgba(197,165,90,0.45); }
.g-dot.now { background: var(--gold); box-shadow: 0 0 0 3px rgba(197,165,90,0.3); }
.g-dot.free { border-radius: 2px; }
.g-title { order: 3; flex-basis: 100%; color: var(--gold); font-weight: 700; font-size: 1.04em; line-height: 1.3; margin-top: 2px; }
.g-lines p { margin: 7px 0 0; font-size: 0.9em; line-height: 1.45; }
.g-tag { display: inline-block; font-size: 0.68em; font-weight: 800; text-transform: uppercase; letter-spacing: 0.6px; border-radius: 9px; padding: 1px 8px; margin-right: 6px; vertical-align: 1px; }
.g-tag.do { background: var(--ember); color: #fff; }
.g-tag.watch { background: var(--gold); color: var(--dark-bg); }
.g-tag.why { background: #4a4a4a; color: var(--warm-white); }
.g-nav { display: flex; gap: 8px; margin-top: 10px; }
.g-nav .btn { flex: 1; padding: 7px 6px; }

/* plain words under a plot */
.plain { margin-top: 6px; padding: 5px 12px; border-left: 3px solid var(--steel); background: rgba(255,255,255,0.03); border-radius: 4px; font-size: 0.88em; }
.plain p { margin: 2px 0; }
.plain b, .ans b { font-weight: 700; }
b.gold, .gold { color: var(--gold); } b.ember, .ember { color: var(--ember); } b.blue, .blue { color: #6FA8E6; }
b.steel, .steel { color: var(--steel); } b.green { color: var(--green); }

/* the tiles: one piece of the picture each */
.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 10px; align-content: start; }
.tile { background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px; padding: 7px 12px 5px; cursor: pointer; transition: border-color 0.15s, box-shadow 0.15s; min-width: 0; }
.tile:hover { border-color: #666; }
.tile.wide { grid-column: span 2; }
@media (max-width: 760px) { .tile.wide { grid-column: span 1; } }
.tile.active { border-color: var(--gold); box-shadow: 0 0 0 1px var(--gold), 0 2px 12px rgba(197,165,90,0.22); }
.tile.focus { border-color: var(--warm-white); box-shadow: 0 0 0 1px var(--warm-white); }
.t-head { display: flex; align-items: center; gap: 8px; }
.t-name { font-weight: 700; color: var(--warm-white); font-size: 0.95em; flex: 1; min-width: 0; }
.t-val { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-weight: 700; color: var(--warm-white); white-space: nowrap; }
.t-mean { color: var(--muted); font-size: 0.78em; margin: 1px 0 0; line-height: 1.4; }
.t-mean code { color: var(--gold); font-size: 0.95em; }
.t-math { overflow-x: auto; overflow-y: hidden; font-size: 0.88em; }
.t-math .katex-display { margin: 0.3em 0 0.1em; text-align: left; }
.t-math .katex-display > .katex { text-align: left; }
.sw { width: 18px; height: 12px; border-radius: 2px; flex: 0 0 18px; display: inline-block; }
.sw.none { visibility: hidden; }
.sw.h0 { height: 0; border-top: 3px solid var(--ember); border-radius: 0; }
.sw.h1 { height: 0; border-top: 3px solid var(--blue); border-radius: 0; }
.sw.alpha { background: rgba(232,114,58,0.75); }
.sw.beta { background: rgba(74,144,217,0.55); }
.sw.power { background: repeating-linear-gradient(135deg, rgba(74,144,217,0.95) 0 2px, rgba(74,144,217,0.12) 2px 5px); border: 1px solid rgba(74,144,217,0.8); }
.sw.line { height: 0; border-top: 2px dashed var(--warm-white); border-radius: 0; }
.sw.gold { height: 0; border-top: 3px solid var(--gold); border-radius: 0; }
.sw.goldbar { background: rgba(197,165,90,0.65); width: 8px; flex-basis: 8px; height: 16px; }
.sw.steel { height: 14px; width: 2px; flex-basis: 18px; background: linear-gradient(90deg, transparent 8px, var(--steel) 8px, var(--steel) 10px, transparent 10px); }
.sw.pval { background: rgba(232,114,58,0.6); }
svg.split { max-width: 100%; height: auto; display: block; margin: 6px 0 3px; }
.split-key { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0 10px; font-size: 0.8em; font-weight: 600; }
.split-hint { color: var(--muted); font-size: 0.8em; margin-top: 2px; }

.placeholder { color: var(--muted); font-size: 0.95em; padding: 40px 20px; text-align: center; border: 1px dashed #555; border-radius: 6px; }
svg.plot .drag { cursor: ns-resize; }

/* the Anvil */
.big-answer { text-align: center; padding: 4px 0 8px; }
.big-answer .n { font-size: 2.6em; font-weight: 800; color: var(--gold); line-height: 1.1; }
.big-answer .what { color: var(--muted); font-size: 0.8em; text-transform: uppercase; letter-spacing: 0.4px; }
.ans { font-size: 0.92em; margin: 8px 0; }
.ans.muted { color: var(--muted); font-size: 0.84em; }
table.args { width: 100%; border-collapse: collapse; font-size: 0.88em; }
table.args th { color: var(--muted); text-align: left; font-weight: 600; text-transform: uppercase; font-size: 0.78em; letter-spacing: 0.4px; padding: 4px 8px; border-bottom: 1px solid var(--border); }
table.args td { padding: 6px 8px; border-bottom: 1px solid #3e3e3e; vertical-align: top; }
table.args td:last-child { text-align: right; white-space: nowrap; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-weight: 700; }
table.args code { color: var(--gold); }
table.args tr.solved td { background: rgba(232,114,58,0.12); }
table.args tr.solved td:first-child { box-shadow: inset 3px 0 0 var(--ember); }
.q { color: var(--ember); font-weight: 800; }
.how-title { color: var(--gold); font-size: 0.78em; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; margin: 14px 0 0; }
#a-how { font-size: 0.92em; }
#a-how .katex-display { margin: 0.3em 0 0.7em; text-align: left; overflow-x: auto; overflow-y: hidden; }
#a-how .katex-display > .katex { text-align: left; }
.how-note { color: var(--muted); font-size: 0.86em; margin: 6px 0 0; }
.ctl.solving { opacity: 0.55; }
.ctl.solving::before { content: "R solves this one"; display: inline-block; margin: 12px 0 -8px; background: var(--ember); color: #fff; border-radius: 8px; padding: 1px 8px; font-size: 0.7em; font-weight: 700; letter-spacing: 0.3px; }
.conv { border: 1px solid var(--border); border-radius: 6px; padding: 8px 10px; margin-top: 12px; background: rgba(255,255,255,0.03); }
.conv-title { color: var(--gold); font-weight: 600; font-size: 0.85em; }
.conv-row { display: grid; grid-template-columns: auto 1fr auto 1fr; gap: 6px; align-items: center; margin-top: 6px; }
.conv-row label { margin: 0 !important; font-size: 0.75em !important; }
.conv-row input { width: 100%; background: #404040; color: var(--warm-white); border: 1px solid #555; border-radius: 4px; padding: 4px 6px; font: inherit; font-size: 0.9em; }
.conv-out .katex-display { margin: 0.4em 0 0; }
pre.printout .cmt { color: var(--steel); }

/* keep wide children (a long formula line) from widening the page on a phone */
.main { grid-template-columns: repeat(12, minmax(0, 1fr)); }
@media (max-width: 960px) { .tab.active { grid-template-columns: minmax(0, 1fr); } .sidebar { padding-bottom: 24px; border-right: none; border-bottom: 1px solid var(--border); } }
@media (max-width: 600px) { .main { padding: 12px 16px; } .forge-logo { width: 64px; height: 42px; } .forge-anvil { width: 64px; } .forge-fire { height: 42px; } .navbar { min-height: 46px; } .nav button { padding: 8px 6px; } .tiles { grid-template-columns: minmax(0, 1fr); } }

/* the left column holds the step card: a little wider, and it scrolls on its own on a laptop */
.tab.active { grid-template-columns: 320px minmax(0, 1fr); }
@media (min-width: 961px) {
  .sidebar { position: sticky; top: 62px; align-self: start; height: calc(100vh - 62px); overflow-y: auto; padding-bottom: 40px; }
}
@media (max-width: 960px) { .tab.active { grid-template-columns: minmax(0, 1fr); } }
.sidebar .says { margin-bottom: 4px; font-size: 0.88em; color: var(--muted); }
.main { padding-top: 14px; }

/* piles of simulated trials drop in, one dot at a time */
svg .drop { animation: drop 0.55s cubic-bezier(.25,.7,.35,1) both; animation-delay: var(--d, 0ms); }
/* counting: dots past the line light up one at a time */
svg .lit { animation: lit 0.5s ease both; animation-delay: var(--d, 0ms); transform-box: fill-box; transform-origin: center; }
@keyframes lit { from { fill-opacity: 0.28; transform: scale(1); } 45% { transform: scale(1.7); } to { fill-opacity: 0.95; transform: scale(1); } }
.sw.overlap { background: rgba(245,240,230,0.3); }
@keyframes drop { from { transform: translateY(-230px); opacity: 0; } 45% { opacity: 1; } to { transform: translateY(0); opacity: 1; } }
@media (prefers-reduced-motion: reduce) { svg .drop, svg .lit { animation: none; } }
/* sums of squares drawn as squares, and F as squares in a square */
svg.squares { max-width: 100%; height: auto; display: block; margin: 6px 0 2px; }
/* the four designs side by side */
.multiples { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.mini { background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px; padding: 7px 10px 8px; cursor: pointer; transition: border-color 0.15s; }
.mini:hover { border-color: #666; }
.mini.active { border-color: var(--gold); box-shadow: 0 0 0 1px var(--gold); }
.mini-title { font-weight: 700; color: var(--warm-white); font-size: 0.92em; margin-bottom: 2px; }
.mini-title .num { color: var(--ember); margin-right: 5px; }
.mini-nums { display: flex; justify-content: space-between; gap: 6px; font-size: 0.8em; color: var(--muted); margin-top: 4px; }
.mini-nums b { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
@media (max-width: 1100px) { .multiples { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.plain p.muted { color: var(--muted); }
.verdict { text-align: left; margin-top: 6px; padding: 5px 12px; border-left: 3px solid var(--gold); background: rgba(255,255,255,0.03); border-radius: 4px; font-size: 0.88em; }
.verdict p { margin: 2px 0; }
/* Build the F before the significance step: the plots alone, drawn at the size they keep once that panel joins them */
#tab-build .main.solo .b-null-card { display: none; }
@media (min-width: 1251px) {
  #tab-build .main.solo .b-plots-card { grid-column: span 12; }
  #tab-build .main.solo #b-plots svg { width: 57.5%; margin: 0 auto; display: block; }
}
/* Two Ways to F: the two formulas side by side, and R's two printouts with matching numbers colored */
table.match { width: 100%; border-collapse: collapse; margin: 4px 0 2px; font-size: 0.92em; }
table.match th, table.match td { padding: 4px 6px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: middle; }
table.match thead th { color: var(--muted); font-size: 0.82em; font-weight: 600; text-transform: uppercase; letter-spacing: 0.3px; }
table.match tbody th { color: var(--warm-white); font-size: 0.85em; font-weight: 700; width: 64px; }
table.match tr:last-child th, table.match tr:last-child td { border-bottom: none; }
.r-pair { display: grid; gap: 6px; margin-top: 4px; }
.r-pair pre.printout { font-size: 0.7em; line-height: 1.35; padding: 7px 10px; }
pre.printout .rp-w { color: var(--warm-white); font-weight: 700; }
pre.printout .rp-s { color: var(--steel); font-weight: 700; }
pre.printout .rp-g { color: var(--gold); font-weight: 700; }
pre.printout .rp-f { color: var(--warm-white); font-weight: 700; text-decoration: underline; text-decoration-color: rgba(245,240,230,0.35); text-underline-offset: 2px; }
.sw.white { background: rgba(245,240,230,0.85); }
.split-r2 { color: var(--muted); font-size: 0.8em; margin-top: 3px; }

/* each line becomes its square: the overlay the squares fly across */
#fx-overlay { position: fixed; inset: 0; width: 100vw; height: 100vh; pointer-events: none; z-index: 1030; overflow: visible; }
svg .fadein { animation: fadein 0.7s ease both; }
@keyframes fadein { from { opacity: 0; } to { opacity: 1; } }
/* after the split, its labels fade in under the bar */
.split-key.fresh, .split-r2.fresh { animation: fadein 0.7s ease both; }
.t-val.pulse { animation: pulse 1s ease; }
@keyframes pulse { 40% { color: var(--gold); text-shadow: 0 0 10px rgba(197,165,90,0.8); } }
@media (prefers-reduced-motion: reduce) { svg .fadein, .split-key.fresh, .split-r2.fresh, .t-val.pulse { animation: none; } }

/* ---------- The Anvil: five questions, and the calculator beside them ---------- */
.calc-note { color: var(--muted); font-size: 0.8em; margin: 6px 0 0; }
.g-dot.right { background: var(--green); border-color: var(--green); }
.g-dot.shown { background: rgba(232,114,58,0.55); border-color: var(--ember); }
.q-story { font-size: 0.98em; line-height: 1.55; max-width: 1040px; }
.q-story p { margin: 0 0 8px; }
.q-story code { white-space: nowrap; color: var(--gold); }
.q-ask { font-weight: 600; color: var(--warm-white); margin: 10px 0 6px; }
.q-work { margin-top: 4px; }
.q-pic { margin: 2px 0 6px; }
.q-pic svg.plot { max-width: 1120px; }
.q-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 14px; }
.q-msg { font-size: 0.9em; flex: 1 1 320px; }
.q-msg.ok { color: var(--green); font-weight: 600; } .q-msg.bad { color: var(--ember); } .q-msg.hint { color: var(--gold); }
.q-math { margin-top: 12px; padding: 8px 14px 6px; border-left: 3px solid var(--green); background: rgba(76,175,80,0.07); border-radius: 4px; font-size: 0.92em; }
.q-math p { margin: 6px 0; }
.steps { display: flex; flex-wrap: wrap; gap: 2px 34px; }
.step { flex: 0 1 auto; max-width: 100%; min-width: 0; overflow-x: auto; overflow-y: hidden; }
.step-name { display: block; color: var(--muted); font-size: 0.78em; text-transform: uppercase; letter-spacing: 0.4px; margin-top: 4px; }
.step .katex-display { margin: 0.15em 0 0.3em; text-align: left; }
.step .katex-display > .katex { text-align: left; }
pre.printout.q-r { max-width: 640px; margin: 4px 0 10px; }
/* question 1: names to pictures */
.m-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 2px 0 12px; min-height: 34px; align-items: center; }
.m-note { color: var(--muted); font-size: 0.85em; }
.chip { background: #404040; border: 1px solid #666; color: var(--warm-white); font: inherit; font-size: 0.9em; font-weight: 600; padding: 5px 13px; border-radius: 16px; cursor: pointer; }
.chip:hover { border-color: var(--gold); }
.chip.pick { border-color: var(--gold); box-shadow: 0 0 0 2px var(--gold); background: rgba(197,165,90,0.18); }
.chip.in { cursor: inherit; font-size: 1.12em; padding: 4px 12px; }
.m-pics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.with-calc .m-pics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.with-calc .m-pic svg.plot { max-width: 300px; margin: 0 auto; }
.with-calc .m-pic { padding-bottom: 6px; }
@media (max-width: 1100px) { .m-pics { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .m-pics { grid-template-columns: minmax(0, 1fr); } }
.m-pic { position: relative; border: 1px solid var(--border); border-radius: 6px; padding: 6px 8px 8px; background: var(--card-bg); min-width: 0; }
.m-pic[data-act] { cursor: pointer; }
.m-pic.ready:hover, .m-pic[data-act]:focus-visible { border-color: var(--gold); box-shadow: 0 0 0 1px var(--gold); outline: none; }
.m-pic.ok { border-color: var(--green); box-shadow: 0 0 0 1px var(--green); }
.m-pic.bad { border-color: var(--ember); box-shadow: 0 0 0 1px var(--ember); }
.m-letter { position: absolute; top: 6px; left: 10px; color: var(--gold); font-weight: 800; font-size: 0.95em; }
.m-calc { text-align: center; font-size: 0.9em; font-weight: 600; margin: 2px 0 8px; font-variant-numeric: tabular-nums; }
.m-slot { border: 1px dashed #666; border-radius: 16px; min-height: 34px; display: flex; align-items: center; justify-content: center; color: var(--muted); font-size: 0.8em; padding: 2px; }
.m-name { text-align: center; color: var(--gold); font-weight: 700; margin-top: 2px; }
.m-pic .t-math .katex-display { text-align: center; margin: 0.2em 0 0; }
.m-pic .t-math .katex-display > .katex { text-align: center; }
/* question 2: the ANOVA table */
.t-strip { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; margin: 0 0 10px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.t-which { color: var(--gold); font-weight: 700; font-size: 0.85em; text-transform: uppercase; letter-spacing: 0.4px; }
.t-boxes { display: flex; flex-wrap: wrap; gap: 3px; }
.t-box { width: 26px; height: 24px; padding: 0; border-radius: 4px; border: 1px solid #555; background: #3b3b3b; color: var(--muted); font: inherit; font-size: 0.72em; cursor: pointer; }
.t-box:hover { border-color: var(--gold); color: var(--warm-white); }
.t-box.done { background: rgba(76,175,80,0.35); border-color: var(--green); color: var(--warm-white); }
.t-box.now { box-shadow: 0 0 0 2px var(--gold); color: var(--warm-white); }
.t-note { color: var(--muted); font-size: 0.8em; }
.t-eqbar { display: flex; align-items: center; gap: 10px; margin: 0 0 8px; color: var(--muted); font-size: 0.85em; }
.t-eqbar .radios { width: 110px; }
.sudoku-scroll { max-width: 100%; overflow-x: auto; position: relative; }
table.sudoku { border-collapse: collapse; font-size: 1em; font-variant-numeric: tabular-nums; }
table.sudoku th, table.sudoku td { border: 1px solid var(--border); padding: 0; text-align: center; vertical-align: bottom; }
table.sudoku thead th { color: var(--warm-white); font-size: 0.85em; font-weight: 700; padding: 5px 10px; background: rgba(255,255,255,0.03); vertical-align: middle; }
table.sudoku tbody th { text-align: left; padding: 4px 12px; font-weight: 700; color: var(--warm-white); white-space: nowrap; vertical-align: middle; }
table.sudoku td { width: 118px; height: 62px; }
table.sudoku td.given { font-weight: 700; color: var(--warm-white); background: rgba(197,165,90,0.10); }
table.sudoku td.none { background: #2c2c2c; }
table.sudoku td.pcell { color: var(--muted); width: auto; }
table.sudoku td.pcell.open { color: var(--ember); font-weight: 700; }
table.sudoku td.blank input { display: block; width: 100%; height: 34px; border: none; background: #f5f0e6; color: #1e1e1e; font: inherit; font-weight: 600; text-align: center; padding: 0 4px; border-radius: 0; }
table.sudoku td.blank input:focus { outline: 2px solid var(--gold); outline-offset: -2px; }
table.sudoku td.blank input[readonly] { background: rgba(76,175,80,0.18); color: var(--warm-white); }
table.sudoku td.blank.ok input { box-shadow: inset 0 0 0 3px var(--green); }
table.sudoku td.blank.bad input { box-shadow: inset 0 0 0 3px var(--ember); }
table.sudoku td.blank.hinted input { box-shadow: inset 0 0 0 3px var(--gold); }
table.sudoku.noeq .cell-f, table.sudoku.noeq .src-n, table.sudoku.noeq .t-n { display: none; }
/* the steps: a number on each blank, and one order that works beside the table */
table.sudoku td.blank { position: relative; }
.t-n { position: absolute; top: 4px; left: 5px; min-width: 17px; height: 17px; padding: 0 4px; border-radius: 9px; background: var(--gold); color: var(--dark-bg); font-size: 0.68em; font-weight: 800; line-height: 17px; text-align: center; pointer-events: none; }
.t-wrap { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 14px 22px; }
.t-wrap .sudoku-scroll { flex: 0 1 auto; min-width: 0; max-width: 100%; }
.t-steps { flex: 1 1 260px; max-width: 420px; font-size: 0.9em; line-height: 1.45; }
.t-steps-h { color: var(--gold); font-weight: 700; font-size: 0.85em; text-transform: uppercase; letter-spacing: 0.4px; margin: 2px 0 6px; }
.t-steps ol { margin: 0; padding-left: 0; list-style: none; counter-reset: step; }
.t-steps li { counter-increment: step; position: relative; padding: 3px 0 3px 28px; color: var(--warm-white); }
.t-steps li::before { content: counter(step); position: absolute; left: 0; top: 4px; min-width: 17px; height: 17px; border-radius: 9px; background: var(--gold); color: var(--dark-bg); font-size: 0.75em; font-weight: 800; line-height: 17px; text-align: center; }
.t-steps li.now { color: var(--gold); font-weight: 700; }
table.sudoku td.blank .cell-f { padding-left: 29px; }
@media (max-width: 600px) {
  .t-n { min-width: 14px; height: 14px; line-height: 14px; padding: 0 3px; font-size: 0.6em; top: 3px; left: 3px; }
  table.sudoku td.blank .cell-f { padding-left: 19px; }
}
table.sudoku.noeq td { height: 40px; vertical-align: middle; }
/* the equations in the table: each cell's on its first line, above its number */
.cell-f { display: block; padding: 4px 8px 3px; font-size: 0.88em; font-weight: 400; color: var(--steel); white-space: nowrap; line-height: 1.2; }
.cell-f .katex { font-size: 1.12em; }
.cell-v { display: block; line-height: 34px; }
.src-n { display: block; font-size: 0.8em; font-weight: 400; color: var(--steel); }
/* questions 3 to 5: choices and typed numbers */
.opts { display: grid; gap: 6px; max-width: 760px; }
.opts.row { grid-template-columns: repeat(2, minmax(0, 120px)); }
.opt { text-align: left; background: #404040; border: 1px solid #555; color: var(--warm-white); font: inherit; font-size: 0.92em; padding: 8px 12px; border-radius: 5px; cursor: pointer; }
.opt:hover:not(:disabled) { border-color: var(--gold); }
.opt:disabled { cursor: default; }
.opt.pick { border-color: var(--gold); box-shadow: 0 0 0 1px var(--gold); background: rgba(197,165,90,0.15); }
.opt.ok { border-color: var(--green); box-shadow: 0 0 0 1px var(--green); background: rgba(76,175,80,0.15); }
.opt.bad { border-color: var(--ember); box-shadow: 0 0 0 1px var(--ember); background: rgba(232,114,58,0.12); }
.opt-why { display: block; color: var(--muted); font-size: 0.88em; margin-top: 3px; }
.nums { display: flex; flex-wrap: wrap; gap: 10px 28px; margin-top: 6px; }
.num-q label { display: block; font-weight: 600; font-size: 0.92em; margin-bottom: 4px; }
.num-q input { width: 120px; background: #f5f0e6; color: #1e1e1e; border: none; border-radius: 4px; padding: 7px 10px; font: inherit; font-weight: 600; font-size: 1em; }
.num-q input:focus { outline: 2px solid var(--gold); }
.num-q input[readonly] { background: rgba(76,175,80,0.18); color: var(--warm-white); }
.num-q.ok input { box-shadow: 0 0 0 3px var(--green); }
.num-q.bad input { box-shadow: 0 0 0 3px var(--ember); }
/* the calculator */
.calc label { display: block; color: var(--gold); font-weight: 600; font-size: 0.74em; text-transform: uppercase; letter-spacing: 0.3px; margin: 8px 0 4px; }
.calc label .sym { text-transform: none; }
.calc-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 14px; }
.calc .slider-head .val { color: var(--warm-white); font-weight: 700; font-size: 0.85em; }
.calc .ctl.solving::before { content: none; }
.calc .ctl.solving .slider-head label::after { content: " · R solves"; color: var(--ember); text-transform: none; letter-spacing: 0; }
.calc .ctl.solving .slider-head .val { color: var(--ember); }
.calc .radios.chips { margin-top: 10px; }
.calc .ans { margin: 10px 0 8px; font-size: 0.9em; }
.calc pre.printout { font-size: 0.7em; }
.calc-close { background: none; border: none; color: var(--warm-white); font-size: 1.3em; line-height: 1; cursor: pointer; padding: 0 2px; }
.card-header code { color: var(--gold); text-transform: none; font-size: 1.05em; }
@media (max-width: 600px) {
  table.sudoku { font-size: 0.86em; }
  table.sudoku tbody th { white-space: normal; padding: 4px 6px; line-height: 1.2; }
  table.sudoku td { width: 62px; }
}

/* Two Ways to F's two gardens: plots that can be dropped, and a tile as wide as the row */
svg .gplot.live { cursor: pointer; }
svg .gplot.live:hover circle:nth-child(2) { stroke: var(--gold); stroke-width: 2.2; }
.tile.full { grid-column: 1 / -1; }
/* a plot that leaves pops a little and shrinks away; one that comes back pops in */
svg .gfade { animation: gfade 0.55s ease-in forwards; transform-box: fill-box; transform-origin: center; pointer-events: none; }
@keyframes gfade { 0% { opacity: 1; transform: scale(1); } 30% { opacity: 1; transform: scale(1.3); } 100% { opacity: 0; transform: scale(0.05); } }
svg .gpop { animation: gpop 0.45s ease-out both; transform-box: fill-box; transform-origin: center; }
@keyframes gpop { 0% { opacity: 0; transform: scale(0.05); } 70% { opacity: 1; transform: scale(1.2); } 100% { opacity: 1; transform: scale(1); } }
@media (prefers-reduced-motion: reduce) { svg .gfade { display: none; } svg .gpop { animation: none; } }