/* PsicoListo. Una columna de trabajo (máx. 1120 px) bajo una barra fija; cada vista cambia dentro de #vista. */
:root {
  --bg: #edf1f5;
  --surface: #ffffff;
  --surface-2: #f4f6f9;
  --line: #d4dbe4;
  --fg: #16212e;
  --muted: #566476;
  --accent: #1c5bb5;
  --accent-fg: #ffffff;
  --accent-soft: #e0e9f7;
  --mark: #f2b632;
  --warn: #a55a00;
  --ok: #16703e;
  --ok-soft: #dcefe3;
  --bad: #ad2a22;
  --bad-soft: #f7e1df;
  --tile-bg: #fdfdfe;
  --tile-ink: #151b23;
  --tile-mid: #9ca7b4;
  --tile-line: #d0d7e0;
  --tile-label: #5d6876;
  --font-display: "Barlow Semi Condensed", "Arial Narrow", "Roboto Condensed", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d131b; --surface: #151e29; --surface-2: #1b2632; --line: #2c3a4a; --fg: #e3e9f0; --muted: #9eacbc;
    --accent: #84abff; --accent-fg: #0b1220; --accent-soft: #1d2e49; --mark: #f2b632; --warn: #f3a64c;
    --ok: #66cf92; --ok-soft: #173222; --bad: #ff9088; --bad-soft: #3d1f1d;
    --tile-bg: #e7ecf2; --tile-ink: #141a22; --tile-mid: #8894a2; --tile-line: #b9c3ce; --tile-label: #4f5a67;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; background: var(--bg); color: var(--fg); font-family: var(--font-body); font-size: 15px; line-height: 1.5; padding-bottom: env(safe-area-inset-bottom, 0px); }
img, svg { max-width: 100%; }
a { color: var(--accent); }
h1, h2, h3, .h3 { font-family: var(--font-display); text-wrap: balance; margin: 0; }
h1 { font-size: clamp(27px, 4.4vw, 38px); font-weight: 700; line-height: 1.06; }
h2, .h3 { display: block; font-size: 20px; font-weight: 600; line-height: 1.2; }
p { margin: 0; }
b { font-weight: 600; }
.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding-inline: 16px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.eyebrow { font: 600 12px/1.25 var(--font-body); letter-spacing: .09em; text-transform: uppercase; color: var(--muted); }
kbd { font: 500 12px/1 var(--font-mono); padding: 2px 6px; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 4px; background: var(--surface-2); color: var(--fg); }
.skip { position: absolute; left: -9999px; top: 8px; z-index: 30; background: var(--surface); color: var(--fg); padding: 8px 12px; border-radius: 6px; }
.skip:focus { left: 12px; }

/* Barra superior */
.topbar { position: sticky; top: 0; z-index: 10; background: var(--surface); border-bottom: 1px solid var(--line); padding-top: env(safe-area-inset-top, 0px); }
.topbar .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; padding-block: 9px; }
.brand { display: inline-flex; align-items: center; gap: 9px; color: var(--fg); text-decoration: none; font: 700 21px/1 var(--font-display); letter-spacing: .01em; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.nav { display: flex; gap: 4px; }
.nav a { font: 600 15px/1 var(--font-display); letter-spacing: .06em; text-transform: uppercase; text-decoration: none; padding: 9px 11px; border-radius: 6px; color: var(--muted); }
.nav a:hover { color: var(--fg); }
.nav a[aria-current="true"] { color: var(--accent); background: var(--accent-soft); }
.top-right { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.clock a { display: inline-flex; align-items: baseline; gap: 8px; text-decoration: none; color: var(--fg); font: 600 19px/1 var(--font-mono); font-variant-numeric: tabular-nums; padding: 7px 11px; border-radius: 6px; border: 1px solid var(--line); background: var(--surface-2); }
.clock .lbl { font: 600 11px/1 var(--font-body); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.clock.low a { color: var(--warn); border-color: var(--warn); }

main.wrap { flex: 1; display: grid; gap: 26px; align-content: start; padding-block: 24px 56px; outline: none; }

/* Botones */
.btn { display: inline-flex; flex-direction: column; align-items: flex-start; gap: 3px; text-align: left; text-decoration: none; font: 600 15px/1.2 var(--font-body); padding: 11px 16px; border-radius: 7px; border: 1px solid var(--line); background: var(--surface); color: var(--fg); cursor: pointer; }
.btn small { font-weight: 400; font-size: 12.5px; color: var(--muted); }
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.btn.primary small { color: inherit; opacity: .85; }
.btn.slim { flex-direction: row; align-items: center; padding: 9px 13px; font-size: 14px; }
.btn.ready { box-shadow: 0 0 0 3px var(--accent-soft); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn:focus-visible, .nav a:focus-visible, .ans:focus-visible, .navbox:focus-visible, .tile:focus-visible, .sheet-tab:focus-visible, .brand:focus-visible, .clock a:focus-visible, .repaso-link:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.back { justify-self: start; font-weight: 600; text-decoration: none; font-size: 14px; }
.back:hover { text-decoration: underline; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 18px; min-width: 0; }
.chip { display: inline-block; font: 600 12px/1 var(--font-body); padding: 5px 9px; border-radius: 999px; white-space: nowrap; }
.chip.ok { background: var(--ok-soft); color: var(--ok); }
.chip.bad { background: var(--bad-soft); color: var(--bad); }
.chip.skip { background: var(--surface-2); color: var(--muted); border: 1px solid var(--line); }

/* Inicio */
.hero { display: grid; gap: 12px; max-width: 760px; padding-top: 8px; }
.lede { color: var(--muted); max-width: 64ch; font-size: 16px; }
.lede b { color: var(--fg); }
.hint { background: var(--accent-soft); border-radius: 8px; padding: 10px 12px; max-width: 64ch; }
.mods { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.mod-card { display: grid; gap: 10px; align-content: start; }
.mod-card .btn { justify-self: start; margin-top: 4px; }
.mod-top { display: flex; align-items: center; gap: 10px; }
.mod-icon { flex: none; width: 38px; height: 38px; display: grid; place-items: center; border-radius: 9px; background: var(--accent-soft); color: var(--accent); }
.mod-icon svg { width: 22px; height: 22px; }
.mod-meta { font: 500 13px/1.4 var(--font-mono); color: var(--muted); }
.mod-meta b { color: var(--ok); }
.repaso-link { display: flex; align-items: center; justify-content: space-between; gap: 16px; text-decoration: none; color: var(--fg); }
.repaso-link > span:first-child { display: grid; gap: 4px; }
.repaso-link .arrow { font-size: 22px; color: var(--accent); }
.repaso-link:hover { border-color: var(--accent); }
@media (max-width: 720px) { .mods { grid-template-columns: 1fr; } }

/* Intro de cada prueba */
.intro { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 32px; align-items: start; }
.intro-main { display: grid; gap: 14px; min-width: 0; }
.facts { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 7px 16px; margin: 4px 0; }
.facts dt { font: 600 12px/1.6 var(--font-body); letter-spacing: .07em; text-transform: uppercase; color: var(--muted); }
.facts dd { margin: 0; }
.example { display: grid; gap: 12px; }
.ex-q { font-size: 16px; font-style: italic; }
.calc { font-family: var(--font-mono); font-size: 14.5px; }
.hist-wrap { display: grid; gap: 10px; max-width: 640px; }
@media (max-width: 820px) { .intro { grid-template-columns: 1fr; } }

/* Tablas y gráficas */
.table-scroll { overflow-x: auto; }
table.data { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }
table.data caption { caption-side: top; text-align: left; font: 600 13px/1.3 var(--font-body); color: var(--muted); padding-bottom: 8px; }
table.data th, table.data td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: right; white-space: nowrap; }
table.data thead th { font: 600 12px/1.2 var(--font-body); letter-spacing: .05em; text-transform: uppercase; color: var(--muted); }
table.data th:first-child { text-align: left; }
table.data tbody th { font-weight: 600; }
table.data td { font-family: var(--font-mono); font-size: 14.5px; }
table.hist td { text-align: left; font-size: 13.5px; }
.note { color: var(--muted); font-size: 13px; margin-top: 10px; }
.chart-cap { font: 600 13px/1.3 var(--font-body); color: var(--muted); margin-bottom: 6px; }
.chart { display: block; width: 100%; min-width: 340px; height: auto; font-family: var(--font-mono); }
.chart .gridline { stroke: var(--line); stroke-width: 1; }
.chart .bar { fill: var(--accent); }
.chart .tick { fill: var(--muted); font-size: 13px; }
.chart .val { fill: var(--fg); font-size: 14px; font-weight: 600; }

/* Ronda de verdadero / falso / no se puede saber */
.run { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 20px; align-items: start; }
.sheets { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; min-width: 0; }
.sheet-tabs { display: flex; flex-wrap: wrap; gap: 2px; padding: 8px 8px 0; border-bottom: 1px solid var(--line); }
.sheet-tab { font: 600 14px/1 var(--font-body); padding: 10px 11px; border: 0; border-bottom: 3px solid transparent; background: transparent; color: var(--muted); cursor: pointer; }
.sheet-tab[aria-selected="true"] { color: var(--fg); border-bottom-color: var(--accent); }
.sheet-body { padding: 16px; overflow-x: auto; min-height: 250px; }
.sheet-title { font-size: 18px; margin-bottom: 8px; }
.sheet-text { font-size: 16px; line-height: 1.6; max-width: 62ch; }
.sheet-foot { padding: 0 16px 14px; color: var(--muted); font-size: 12.5px; }
.stmt { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 74px); display: grid; gap: 16px; }
.stmt-text { font-size: 17.5px; line-height: 1.45; min-height: 4.4em; margin-top: 8px; }
.answers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-top: 14px; }
.ans { display: grid; justify-items: center; gap: 4px; padding: 11px 6px; border-radius: 7px; border: 1px solid var(--line); background: var(--surface-2); color: var(--fg); font: 600 14px/1.2 var(--font-body); cursor: pointer; }
.ans .key { font: 500 11px/1 var(--font-mono); color: var(--muted); }
.ans:hover:not(:disabled) { border-color: var(--accent); }
.ans[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.ans[aria-pressed="true"] .key { color: inherit; }
.ans:disabled { cursor: default; }
.navgrid { display: grid; grid-template-columns: repeat(9, minmax(0, 1fr)); gap: 5px; }
.navbox { aspect-ratio: 1 / 1; min-width: 0; padding: 0; border: 1px solid var(--line); border-radius: 5px; background: var(--surface); color: var(--muted); font: 500 12.5px/1 var(--font-mono); cursor: pointer; }
.navbox.done { background: var(--accent-soft); color: var(--fg); }
.navbox.good { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
.navbox.wrong { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); }
.navbox.cur { outline: 2px solid var(--accent); outline-offset: 1px; color: var(--fg); }
.stmt-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.stmt-actions .primary { margin-left: auto; }
.feedback { border-radius: 8px; padding: 12px 14px; margin-top: 14px; display: grid; gap: 6px; }
.feedback.ok { background: var(--ok-soft); }
.feedback.bad { background: var(--bad-soft); }
.fb-head { font-weight: 600; }
.feedback.ok .fb-head { color: var(--ok); }
.feedback.bad .fb-head { color: var(--bad); }
.why { margin: 0; padding-left: 18px; display: grid; gap: 2px; }
@media (max-width: 880px) {
  .run { grid-template-columns: 1fr; }
  .stmt { position: static; order: -1; }
}

/* Rondas de figuras y cuadrículas */
.ind-run, .cua-run { display: grid; gap: 16px; }
.ind-run { max-width: 560px; }
.cua-run { max-width: 900px; }
.ind-head { display: grid; gap: 8px; max-width: 560px; }
.progress { height: 6px; border-radius: 99px; background: var(--line); overflow: hidden; }
.progress i { display: block; height: 100%; background: var(--accent); }
.ind-ask { font-size: 16.5px; }
.ind-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.tiles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; width: 100%; max-width: 450px; }
.tiles.small { max-width: 300px; gap: 7px; }
.tiles.mini { max-width: 210px; gap: 5px; }
.tile { position: relative; display: block; aspect-ratio: 1 / 1; padding: 0; margin: 0; background: var(--tile-bg); border: 2px solid var(--tile-line); border-radius: 8px; overflow: hidden; color: var(--tile-ink); }
button.tile { cursor: pointer; }
button.tile:hover { border-color: var(--accent); }
.tile svg { position: absolute; inset: 9%; width: 82%; height: 82%; }
.tile .num { position: absolute; top: 3px; left: 4px; z-index: 1; padding: 1px 3px; border-radius: 3px; background: var(--tile-bg); font: 600 10.5px/1 var(--font-mono); color: var(--tile-label); }
.tiles.mini .tile { border-width: 1.5px; border-radius: 5px; }
.tiles.mini .num, .tiles.mini .letra { display: none; }
.tile.is-odd { border-color: var(--ok); box-shadow: 0 0 0 3px var(--ok-soft); }
.tile.is-wrong { border-color: var(--bad); box-shadow: 0 0 0 3px var(--bad-soft); }
.tile svg .s { stroke: var(--tile-ink); stroke-width: 2.4; stroke-linejoin: round; }
.tile svg .k { fill: var(--tile-ink); }
.tile svg .w { fill: var(--tile-bg); }
.tile svg .g { fill: var(--tile-mid); }
.tile svg .gl { stroke: var(--tile-line); stroke-width: 1.2; fill: none; }
.tile svg .cell { stroke: var(--tile-line); stroke-width: 1; }
.tile svg .hand { stroke: var(--tile-ink); stroke-linecap: round; }
.tile svg .tk { stroke: var(--tile-ink); stroke-width: 2; }
.tile svg .gbox { fill: none; stroke: var(--tile-ink); stroke-width: 1.4; }
.cua-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 22px; align-items: start; }
.cua-layout section { display: grid; gap: 8px; min-width: 0; }
.tiles.cua-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 300px; }
.tiles.cua-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); max-width: 600px; }
.tiles.cua-2.small { max-width: 170px; }
.tiles.cua-4.small { max-width: 340px; }
.tiles.cua-2.mini { max-width: 110px; }
.tiles.cua-4.mini { max-width: 220px; }
.opt .letra { position: absolute; top: 3px; left: 4px; z-index: 1; padding: 1px 4px; border-radius: 3px; background: var(--tile-bg); font: 700 11px/1 var(--font-mono); color: var(--tile-label); }
.opt[aria-pressed="true"] { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent); }
.opt[aria-pressed="true"] .letra { background: var(--accent); color: var(--accent-fg); }
.mini-lbl { font: 600 12px/1.2 var(--font-body); letter-spacing: .07em; text-transform: uppercase; color: var(--muted); }
.cua-mini { display: grid; gap: 10px; }
.cua-mini > div { display: grid; gap: 6px; }
@media (max-width: 700px) {
  .cua-layout { grid-template-columns: 1fr; }
  .tiles.cua-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 360px; }
  .tiles.cua-4.small, .tiles.cua-4.mini { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* Resultados */
.done-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 18px; }
.done-head > div:first-child { display: grid; gap: 8px; min-width: 0; max-width: 64ch; }
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.stat b { display: block; font: 700 30px/1.1 var(--font-display); font-variant-numeric: tabular-nums; }
.stat span { color: var(--muted); font-size: 13px; }
@media (max-width: 640px) { .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.review { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.rv { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; display: grid; gap: 8px; min-width: 0; }
.rv-top { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.rv-n { font: 600 13px/1 var(--font-mono); color: var(--muted); min-width: 2ch; }
.rv-text { font-weight: 500; }
.rv-exp { color: var(--muted); font-size: 14px; }
.rv-ind { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 16px; align-items: start; }
.rv-cua { display: flex; flex-wrap: wrap; gap: 14px; align-items: start; }
@media (max-width: 560px) { .rv-ind { grid-template-columns: 1fr; } }

/* Repaso y Acerca de */
.ref-intro { display: grid; gap: 8px; max-width: 64ch; }
.ref-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 760px) { .ref-grid { grid-template-columns: 1fr; } }
.ref { display: grid; gap: 10px; align-content: start; }
.ref ul, .ref ol, .prose ul { margin: 0; padding-left: 20px; display: grid; gap: 7px; }
.formula { font-family: var(--font-mono); font-size: 13.5px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 4px; padding: 1px 6px; white-space: nowrap; }
.prose { display: grid; gap: 14px; max-width: 68ch; }
.copy { user-select: all; font-family: var(--font-mono); }

/* Anuncios: solo fuera de las rondas */
.ad { display: grid; gap: 6px; padding: 10px; border: 1px dashed var(--line); border-radius: 10px; }
.ad-label { font: 600 11px/1 var(--font-body); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }

/* Pie y aviso */
.foot { border-top: 1px solid var(--line); background: var(--surface); }
.foot .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px 24px; padding-block: 18px; color: var(--muted); font-size: 13px; }
.foot p { max-width: 70ch; }
.foot nav { display: flex; gap: 16px; }
.toast { position: fixed; left: 50%; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%); z-index: 20; width: min(560px, calc(100% - 32px)); display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 10px; background: var(--fg); color: var(--bg); box-shadow: 0 8px 30px rgba(0, 0, 0, .25); }
.toast span { flex: 1; min-width: 0; }
.toast .x { border: 0; background: transparent; color: inherit; font-size: 22px; line-height: 1; cursor: pointer; padding: 2px 6px; }

@media (prefers-reduced-motion: no-preference) {
  .btn, .nav a, .ans, .navbox, .tile, .sheet-tab, .repaso-link { transition: border-color .12s, background-color .12s, color .12s, box-shadow .12s; }
}