/* Layout: the three fixed algorithms live on a pinned rail (left column on desktop, a top band on phones);
   the working column runs memo walk strip + lookup → cube net with a move-by-move stepper → memo input → letter board. */
:root {
  --bg: #ECEFF3;
  --surface: #F8F9FB;
  --raise: #FFFFFF;
  --ink: #141922;
  --muted: #566073;
  --line: #D0D6DF;
  --accent: #AE2259;          /* raspberry: deliberately not a sticker colour */
  --accent-soft: #F7DDE7;
  --on-accent: #FFFFFF;
  --plastic: #0E1116;
  --mark: #FFFFFF;
  --st-U: #F5F6F1; --st-R: #D7263D; --st-F: #1E9E4B;
  --st-D: #F4D30C; --st-L: #F07A16; --st-B: #1F5BCB;
  --font-display: "Unbounded", "Arial Black", system-ui, sans-serif;
  --font-body: "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "Martian Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --r: 10px;
  --ok: #18803D;              /* readable green for text on light grounds */
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0F1319; --surface: #161B23; --raise: #1C222C; --ink: #E6EAF0; --muted: #98A3B5;
    --line: #2B3341; --accent: #F0699C; --accent-soft: #3B2030; --on-accent: #1B0811;
    --plastic: #05070A; --mark: #FFFFFF;
    --st-U: #E9EBE5; --st-R: #D7263D; --st-F: #1E9E4B; --st-D: #F0CF0C; --st-L: #EE7A1A; --st-B: #2563D6;
    --ok: #4CC774;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0F1319; --surface: #161B23; --raise: #1C222C; --ink: #E6EAF0; --muted: #98A3B5;
  --line: #2B3341; --accent: #F0699C; --accent-soft: #3B2030; --on-accent: #1B0811;
  --plastic: #05070A; --mark: #FFFFFF;
  --st-U: #E9EBE5; --st-R: #D7263D; --st-F: #1E9E4B; --st-D: #F0CF0C; --st-L: #EE7A1A; --st-B: #2563D6;
  --ok: #4CC774;
  color-scheme: dark;
}

* { box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  padding-block: 20px 40px;
}
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.app {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

/* ---------- Rail with the fixed algorithms ---------- */
.rail {
  position: sticky;
  top: calc(env(safe-area-inset-top, 0px) + 16px);
  display: grid;
  gap: 12px;
}
.brand { display: grid; gap: 4px; padding-bottom: 6px; }
.brand h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0;
  text-wrap: balance;
}
.brand p { margin: 0; color: var(--muted); font-size: 13px; }
.rail-head {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
}
.eyebrow {
  font-size: 11px; font-weight: 700; letter-spacing: 0.09em; text-transform: uppercase; color: var(--muted);
}
.rail-toggle {
  display: none;
  background: none; border: 1px solid var(--line); border-radius: 999px;
  padding: 2px 10px; font-size: 12px; color: var(--muted); cursor: pointer;
}
.alg {
  background: var(--raise);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 12px 14px;
  display: grid;
  gap: 6px;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.alg.on { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.alg-top { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.alg-name { font-weight: 700; font-size: 15px; }
.tag {
  font-size: 11px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 1px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted);
  white-space: nowrap;
}
.alg.on .tag { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.moves {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  display: flex; flex-wrap: wrap; column-gap: 0.55em;
  min-width: 0;
}
.alg-note { margin: 0; font-size: 12.5px; color: var(--muted); }
.alg-note b { color: var(--ink); font-weight: 700; }

/* ---------- Main column ---------- */
main { display: grid; gap: 22px; min-width: 0; }
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  display: grid;
  gap: 16px;
  min-width: 0;
}
.panel-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; }
.panel-head h2 { margin: 0; font-size: 17px; font-weight: 700; }
.hint { font-size: 12.5px; color: var(--muted); }
kbd {
  font-family: var(--font-mono); font-size: 11px; padding: 0 5px; border: 1px solid var(--line);
  border-bottom-width: 2px; border-radius: 4px; background: var(--raise); color: var(--ink);
}

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; padding: 3px; background: var(--raise); }
.seg button {
  border: 0; background: none; padding: 6px 16px; border-radius: 999px; cursor: pointer; font-weight: 700; font-size: 14px;
  color: var(--muted);
}
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.seg.small button { padding: 4px 12px; font-size: 13px; }
.basebar { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px; }

/* Viewer */
.viewer { display: grid; gap: 16px; }
.who { display: flex; gap: 16px; align-items: center; }
.big {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 58px;
  line-height: 1;
  width: 84px; height: 84px;
  display: grid; place-items: center;
  border-radius: 14px;
  background: var(--raise);
  border: 1px solid var(--line);
  position: relative;
  flex: none;
}
.big .sw {
  position: absolute; right: -6px; bottom: -6px; width: 22px; height: 22px; border-radius: 5px;
  border: 3px solid var(--plastic);
}
.big.par { font-size: 24px; letter-spacing: 0.02em; }
.who-text { display: grid; gap: 4px; min-width: 0; }
.who-title { font-size: 17px; font-weight: 700; }
.who-desc { margin: 0; color: var(--muted); max-width: 62ch; }
.who-desc b { color: var(--ink); }

.seq { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: flex-start; }
.seq-group { display: grid; gap: 5px; }
.seq-label { font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font-family: var(--font-mono);
  font-size: 14px;
  min-width: 40px;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--raise);
  cursor: pointer;
  text-align: center;
}
.chip.alg-chip { font-family: var(--font-body); font-weight: 700; }
.chip.done { color: var(--muted); }
.chip[aria-current="step"] { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.chip.empty { cursor: default; color: var(--muted); font-family: var(--font-body); font-size: 13px; }

.stage { display: grid; gap: 12px; justify-items: center; container-type: inline-size; }
.net {
  --cell: clamp(17px, calc((100cqi - 90px) / 12), 31px);
  display: grid;
  grid-template-columns: repeat(4, auto);
  grid-template-rows: repeat(3, auto);
  gap: 5px;
}
.face {
  display: grid;
  grid-template-columns: repeat(3, var(--cell));
  grid-template-rows: repeat(3, var(--cell));
  gap: 4px;
  padding: 4px;
  background: var(--plastic);
  border-radius: 7px;
  border: 1px solid var(--line);
}
.cell {
  position: relative;
  border-radius: 3px;
  display: grid; place-items: center;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: calc(var(--cell) * 0.44);
  line-height: 1;
  transition: background-color .18s ease;
}
.cell .lab { opacity: .55; }
.cell.dark-text { color: #1A1A1A; }
.cell.light-text { color: #FFFFFF; }
.cell.swap { outline: 2px dashed var(--mark); outline-offset: 1px; }
.badge {
  position: absolute; inset: 1px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 700;
  font-size: calc(var(--cell) * 0.46);
  border: 2px solid #FFFFFF;
  box-shadow: 0 0 0 1px #000000;
  color: #FFFFFF;
}
.badge.tgt { background: var(--accent); }
.badge.buf { background: #141922; }
.caption {
  margin: 0; text-align: center; max-width: 60ch; font-size: 14px; min-height: 2.9em;
}
.caption b { font-weight: 700; }
.legend { display: flex; flex-wrap: wrap; gap: 8px 18px; justify-content: center; font-size: 12.5px; color: var(--muted); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.lg-dot { width: 16px; height: 16px; border-radius: 50%; border: 2px solid #FFFFFF; box-shadow: 0 0 0 1px #000000; }
.lg-dot.tgt { background: var(--accent); }
.lg-dot.buf { background: #141922; }
.lg-swap { width: 16px; height: 16px; border-radius: 3px; background: var(--plastic); outline: 2px dashed var(--mark); outline-offset: -4px; }
.stepnav { display: flex; gap: 8px; }
.btn {
  border: 1px solid var(--line); background: var(--raise); border-radius: 8px; padding: 6px 14px; cursor: pointer;
  font-weight: 700; font-size: 14px;
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn:disabled { opacity: .45; cursor: default; }
.notice { min-height: 1.4em; margin: 0; font-size: 13px; color: var(--accent); font-weight: 700; }

/* Letter board: one row per face, four Speffz letters each */
.board { display: grid; grid-template-columns: auto repeat(4, minmax(0, 1fr)); gap: 6px; align-items: stretch; }
.row-lab { display: flex; align-items: center; gap: 6px; font-weight: 700; font-size: 13px; padding-right: 4px; }
.row-lab i { width: 14px; height: 14px; border-radius: 3px; border: 2px solid var(--plastic); display: block; }
.key {
  border: 1px solid var(--line); background: var(--raise); border-radius: 9px; cursor: pointer;
  padding: 7px 8px; display: grid; gap: 2px; text-align: left; min-width: 0;
}
.key:hover:not(:disabled) { border-color: var(--muted); }
.key .k-l { font-family: var(--font-display); font-weight: 700; font-size: 18px; line-height: 1.1; }
.key .k-s { font-family: var(--font-mono); font-size: 11px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.key:disabled { cursor: not-allowed; background: transparent; border-style: dashed; }
.key:disabled .k-l { color: var(--muted); }
.key.cur { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.key.cur .k-s { color: var(--on-accent); opacity: .9; }

/* Memo walker */
.fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.field { display: grid; gap: 4px; min-width: 0; }
.field.wide { grid-column: 1 / -1; }
.field label { font-size: 12px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.field input, .field textarea {
  font-family: var(--font-mono); font-size: 14px; padding: 9px 11px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--raise); color: var(--ink); width: 100%; min-width: 0;
}
.field textarea {
  display: block; font-size: 16px; line-height: 1.7; word-spacing: 0.12em;
  resize: none; overflow: hidden; overflow-wrap: normal; min-height: 46px;
}
.field label .count { text-transform: none; letter-spacing: 0; font-weight: 400; }
.field textarea + .inrow { margin-top: 4px; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.inrow { display: flex; flex-wrap: wrap; gap: 8px; min-width: 0; }
.inrow input { flex: 1 1 200px; }
.inrow .btn { flex: none; white-space: nowrap; }
.inrow select {
  font-family: var(--font-body); font-size: 14px; padding: 8px 10px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--raise); color: var(--ink);
}
.install { justify-self: start; padding: 4px 12px; font-size: 13px; }

/* Timer */
.clock {
  display: grid; justify-items: center; gap: 4px; width: 100%;
  padding: 22px 16px; border-radius: 14px; border: 1px solid var(--line);
  background: var(--raise); cursor: pointer; text-align: center;
  -webkit-user-select: none; user-select: none; touch-action: manipulation;
}
.clock-phase { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.clock-time { font-family: var(--font-display); font-weight: 700; font-size: clamp(44px, 12vw, 76px); line-height: 1; font-variant-numeric: tabular-nums; }
.clock-split { font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }
.clock[data-phase="memo"] { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.clock[data-phase="memo"] .clock-phase { color: var(--accent); }
.clock[data-phase="exec"] { border-color: var(--ok); box-shadow: 0 0 0 1px var(--ok); }
.clock[data-phase="exec"] .clock-phase { color: var(--ok); }
.verdict { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: center; }

/* Competition mode: only the clock, full screen; the whole screen is the button. */
.focus-open { display: inline-flex; align-items: center; gap: 7px; }
.focus-only { display: none; }
body.focus { overflow: hidden; }
body.focus .view[data-view="crono"] > .panel {
  position: fixed; inset: 0; z-index: 50; margin: 0; border: 0; border-radius: 0; background: var(--bg);
  display: flex; flex-direction: column; gap: 14px;
  padding: max(16px, env(safe-area-inset-top, 0px)) max(16px, env(safe-area-inset-right, 0px))
    max(16px, env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px));
}
body.focus .view[data-view="crono"] > .panel > :not(.clock):not(.verdict):not(.focus-only),
body.focus #afterResult, body.focus .reto-banner { display: none !important; }
body.focus .focus-only { display: grid; position: relative; z-index: 1; pointer-events: none; }
body.focus .focus-only button { pointer-events: auto; }
body.focus .clock {
  position: absolute; inset: 0; z-index: 0; width: auto; padding: 0; border: 0; border-radius: 0;
  background: transparent; box-shadow: none; place-content: center; gap: 10px;
}
body.focus .clock-phase { font-size: 15px; }
body.focus .clock-time { font-size: clamp(56px, min(19vw, 30vh), 200px); }
body.focus .clock-split { font-size: 16px; }
body.focus .verdict {
  position: absolute; left: 16px; right: 16px; z-index: 1;
  bottom: calc(16% + env(safe-area-inset-bottom, 0px)); font-size: 17px;
}
body.focus .verdict {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px; max-width: 440px; margin: 0 auto;
}
body.focus .verdict > span { grid-column: 1 / -1; text-align: center; }
body.focus .verdict .btn { font-size: 18px; padding: 14px 20px; border-radius: 12px; }
body.focus .clock { -webkit-tap-highlight-color: transparent; }
body.focus .clock:focus-visible { outline: none; }
.focus-top { gap: 12px; justify-items: center; text-align: center; }
.focus-bar { display: flex; align-items: center; justify-content: space-between; gap: 10px; width: 100%; }
.focus-reto { font-weight: 700; color: var(--accent); }
.focus-scr {
  margin: 0; max-width: 34ch; font-family: var(--font-mono); font-size: clamp(16px, 4.4vw, 24px);
  line-height: 1.6; word-spacing: .12em; overflow-wrap: anywhere;
}
.focus-bottom { margin-top: auto; gap: 6px; justify-items: center; text-align: center; }
.focus-stats { margin: 0; font-size: 15px; color: var(--muted); font-variant-numeric: tabular-nums; }
.focus-stats b { color: var(--ink); }
.focus-hint { margin: 0; font-size: 13px; color: var(--muted); }
.focus-hint .on-touch { display: none; }
@media (hover: none) { .focus-hint .on-touch { display: inline; } .focus-hint .on-keys { display: none; } }
/* With a smart cube: the turns and the letters as they happen, at the bottom. */
body.focus .focus-moves {
  position: absolute; left: 16px; right: 16px; z-index: 1; gap: 4px; justify-items: center; text-align: center;
  bottom: max(16px, env(safe-area-inset-bottom, 0px));
}
body.focus[data-timer="idle"] .focus-moves { bottom: calc(max(16px, env(safe-area-inset-bottom, 0px)) + 76px); }
.focus-moves:empty { display: none !important; }
.live-letters { margin: 0; font-family: var(--font-display); font-weight: 700; font-size: clamp(18px, 4.4vw, 28px); letter-spacing: .04em; }
/* Fits its content, centred; when too long, the oldest turns slide out on the left. */
.live-moves {
  margin: 0; display: inline-flex; justify-content: flex-end; align-items: baseline; gap: .45em;
  max-width: 100%; overflow: hidden; white-space: nowrap; font-family: var(--font-mono);
  font-size: clamp(14px, 3.6vw, 20px); color: var(--muted);
}
.live-moves > * { flex: none; }
.live-moves .new { color: var(--accent); }
.live-n { font-family: var(--font-body); font-size: .75em; margin-right: .3em; }
.cube-scr .live-letters { font-size: 20px; }
.cube-scr .live-moves { font-size: 16px; justify-self: start; }
/* While timing, nothing but the time. */
body.focus:not([data-timer="idle"]) .focus-top,
body.focus:not([data-timer="idle"]) .focus-bottom { visibility: hidden; }
/* A phone on its side: «Salir», the scramble and «Nuevo scramble» in one row on top, the clock in the space
   below, and the questions after a solve at the bottom. */
@media (max-height: 500px) and (orientation: landscape) {
  body.focus .view[data-view="crono"] > .panel {
    gap: 6px; padding-top: max(10px, env(safe-area-inset-top, 0px)); padding-bottom: max(8px, env(safe-area-inset-bottom, 0px));
  }
  body.focus .focus-top { grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; justify-items: stretch; gap: 4px 14px; text-align: left; }
  body.focus .focus-scr { max-width: none; font-size: 15px; line-height: 1.4; }
  body.focus .clock { padding: 72px 0 76px; gap: 4px; }
  body.focus .clock-time { font-size: clamp(48px, 30vh, 140px); }
  body.focus .verdict { bottom: max(8px, env(safe-area-inset-bottom, 0px)); gap: 6px 10px; font-size: 15px; }
  body.focus .verdict .btn { font-size: 15px; padding: 8px 14px; }
  body.focus .focus-bottom { gap: 2px; }
  body.focus[data-timer="idle"] .focus-moves { bottom: calc(max(8px, env(safe-area-inset-bottom, 0px)) + 44px); }
}
/* Smart cube: setup trainer and guided execution */
.tr-how { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.tr-cubeline { display: grid; gap: 8px; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line); background: var(--raise); }
.tr-steps { display: flex; flex-wrap: wrap; gap: 8px; }
.tr-step { font-size: 13px; font-weight: 700; padding: 4px 12px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
.tr-step.cur { border-color: var(--accent); color: var(--accent); }
.tr-step.done { border-color: var(--ok); color: var(--ok); }
.tr-cubeline .cube-hint { margin: 0; }
.tr-cubeline .btn { justify-self: start; }
#trForm.cube #trInput { display: none; }
#trForm.cube.ask #trSubmit { display: none; }
.guide-cube { margin: 0; text-align: center; font-size: 16px; font-weight: 700; color: var(--muted); min-height: 1.5em; }
.guide-cube.ok { color: var(--ok); }
.guide-cube.bad { color: var(--accent); font-size: clamp(18px, 4vw, 24px); }
.guide-cube b { font-family: var(--font-mono); }
.guide-seq .sm.done { opacity: .35; }
.practice-cube { text-align: left; font-size: 14px; margin-top: 12px; }
.practice-cube.bad { font-size: 15px; }
.practice-cube:not(.bad):not(.ok)::before { content: ''; display: inline-block; width: 8px; height: 8px; margin-right: 8px; border-radius: 50%; background: var(--ok); vertical-align: 1px; }

/* Smart cube */
.cube-bar {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 14px;
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--raise);
}
.cube-who { display: flex; align-items: center; gap: 10px; min-width: 0; flex: 1 1 260px; }
.cube-bt { flex: none; color: var(--muted); }
.cube-bt[data-s="on"] { color: var(--ok); }
.cube-bt[data-s="connecting"], .cube-bt[data-s="linking"] { color: var(--accent); animation: cube-pulse 1.2s ease-in-out infinite; }
@keyframes cube-pulse { 50% { opacity: .35; } }
.cube-text { display: grid; gap: 1px; min-width: 0; }
.cube-text b { font-size: 14px; }
.cube-acts { display: flex; flex-wrap: wrap; gap: 8px; }
.cube-follow { display: flex; flex-wrap: wrap; gap: 14px 18px; align-items: center; }
.cube-stage { flex: none; }
.net.mini { --cell: 12px; gap: 3px; }
.net.mini .face { gap: 2px; padding: 2px; border-radius: 4px; }
.net.mini .cell { border-radius: 2px; }
.cube-follow-main { flex: 1 1 260px; display: grid; gap: 6px; min-width: 0; }
.cube-follow-main .actions { margin-top: 2px; }
.cube-scr { margin: 0; display: grid; gap: 8px; }
.cube-chips { font-family: var(--font-mono); font-size: 17px; line-height: 1.9; word-spacing: .1em; overflow-wrap: anywhere; }
.sm { padding: 1px 3px; border-radius: 5px; white-space: nowrap; }
.sm.done { opacity: .35; }
.sm.next { background: var(--accent); color: var(--on-accent); font-weight: 600; }
.sm.next.half { background: var(--accent-soft); color: var(--ink); outline: 2px solid var(--accent); }
.cube-hint { display: block; font-size: 14px; }
.cube-hint.ok { color: var(--ok); font-weight: 700; }
.cube-hint.bad { color: var(--accent); font-weight: 700; }
.cube-hint b { font-family: var(--font-mono); }
.focus-scr .cube-chips { font-size: inherit; line-height: 1.6; }
.focus-scr .cube-hint { margin-top: 10px; font-family: var(--font-body); font-size: 16px; word-spacing: normal; }
@media (max-width: 520px) { .cube-stage { display: none; } }
.cube-sim { display: grid; gap: 8px; padding: 12px; border: 1px dashed var(--line); border-radius: 12px; }
.cube-sim .inrow input {
  font-family: var(--font-mono); font-size: 15px; padding: 8px 10px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--raise); color: var(--ink); min-width: 0;
}
.cube-sim .hint { margin: 0; }
.cube-report code { font-family: var(--font-mono); font-size: 13px; }
.mac-p { margin: 0; font-size: 14px; }
.mac-steps { margin: 0; padding-left: 20px; display: grid; gap: 10px; font-size: 14px; }
.mac-url { display: flex; align-items: center; gap: 8px; margin-top: 4px; min-width: 0; }
.mac-url code {
  flex: 1; min-width: 0; font-family: var(--font-mono); font-size: 12px; padding: 6px 8px; border-radius: 6px;
  background: var(--raise); border: 1px solid var(--line); overflow-wrap: anywhere;
}
.mac-url .btn { flex: none; padding: 4px 10px; font-size: 13px; }
#macErr:empty { display: none; }
#macErr { margin: 0; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 8px; }
.stats:empty { display: none; }
.stat { background: var(--raise); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; display: grid; gap: 2px; }
.stat span { font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.stat b { font-family: var(--font-display); font-size: 18px; font-variant-numeric: tabular-nums; }
.history { overflow-x: auto; position: relative; }   /* keeps the hidden «Acciones» header inside the scroller */
.field-title { font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.field .seg { justify-self: start; }
.hist-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 12px; }
.history table { width: 100%; border-collapse: collapse; font-size: 13px; font-variant-numeric: tabular-nums; }
.history th { text-align: left; font-size: 11px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); font-weight: 700; padding: 4px 6px; border-bottom: 1px solid var(--line); }
.history td { padding: 5px 6px; border-bottom: 1px solid var(--line); white-space: nowrap; }
.history td.scr { font-family: var(--font-mono); font-size: 11px; color: var(--muted); max-width: 220px; overflow: hidden; text-overflow: ellipsis; }
.pill { font-size: 11px; font-weight: 700; padding: 1px 8px; border-radius: 999px; border: 1px solid; }
.pill.ok { color: var(--ok); }
.pill.dnf { color: var(--accent); }
.x { border: 0; background: none; color: var(--muted); cursor: pointer; font-size: 16px; padding: 0 4px; }
.empty-note { margin: 0; font-size: 13px; color: var(--muted); }

/* Setup trainer */
.trainer { display: grid; gap: 12px; }
.tr-card { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.tr-card .who-text { flex: 1 1 220px; min-width: 0; }
.tr-card .spoil { flex: none; display: inline-flex; align-items: center; gap: 8px; justify-content: center; }
.kbd-hint { font-family: var(--font-mono); font-size: 11px; font-weight: 400; padding: 0 5px; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 4px; color: var(--muted); }
@media (hover: none), (max-width: 860px) { .kbd-hint { display: none; } }
.tr-cube { padding: 6px 0 2px; }
.tr-feedback { margin: 0; min-height: 1.5em; font-size: 14px; }
.tr-feedback.ok { color: var(--ok); font-weight: 700; }
.tr-feedback.ko { color: var(--accent); font-weight: 700; }
.tr-feedback code { font-family: var(--font-mono); font-weight: 400; color: var(--ink); }
.tr-stats, .m-legend { margin: 0; font-size: 13px; color: var(--muted); }
.mastery { display: grid; grid-template-columns: repeat(auto-fill, minmax(34px, 1fr)); gap: 4px; }
.m-cell { height: 34px; border-radius: 7px; display: grid; place-items: center; font-family: var(--font-display); font-size: 13px; border: 1px dashed var(--line); color: var(--muted); }
.m-cell.seen { border-style: solid; color: var(--ink); }
.m-cell.good { border: 1px solid var(--ok); color: var(--ink); background: color-mix(in srgb, var(--ok) 18%, transparent); }
.m-cell.weak { border: 1px solid var(--accent); color: var(--ink); background: color-mix(in srgb, var(--accent) 16%, transparent); }

/* Guided execution */
.guide {
  position: fixed; inset: 0; z-index: 60; background: var(--bg);
  display: grid; grid-template-rows: auto auto 1fr auto auto; gap: 12px;
  padding: max(14px, env(safe-area-inset-top, 0px)) max(16px, env(safe-area-inset-right, 0px))
           max(14px, env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px));
}
.guide-top { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; }
.guide-title { font-family: var(--font-display); font-weight: 700; font-size: 16px; }
.guide-prog { font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }
.guide-opt { font-size: 13px; color: var(--muted); display: inline-flex; gap: 6px; align-items: center; margin-left: auto; }
.guide-bar { display: flex; align-items: flex-end; gap: 14px; min-width: 0; container: gbar / inline-size; }
.gb-group { display: grid; gap: 5px; min-width: 6px; flex: 1 1 0; container-type: inline-size; }
.gb-lab {
  font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted);
  white-space: nowrap; overflow: hidden;
}
.gb-group.cur .gb-lab { color: var(--ink); }
.gb-segs { display: flex; gap: 3px; }
.gb-seg {
  flex: 1 1 0; min-width: 6px; display: grid; gap: 4px; justify-items: center; padding: 0; border: 0;
  background: none; cursor: pointer; container-type: inline-size;
}
.gb-track { display: block; width: 100%; height: 8px; border-radius: 4px; background: var(--line); overflow: hidden; }
.guide-bar i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .15s ease; }
.gb-seg.cur .gb-track { box-shadow: 0 0 0 1.5px var(--accent); }
.gb-seg:hover .gb-track { box-shadow: 0 0 0 1.5px var(--muted); }
.gb-seg.cur:hover .gb-track { box-shadow: 0 0 0 1.5px var(--accent); }
.gb-letter { font-family: var(--font-display); font-size: 11px; line-height: 1; color: var(--muted); }
.gb-seg.done .gb-letter { opacity: .55; }
.gb-seg.cur .gb-letter { color: var(--accent); font-weight: 700; opacity: 1; }
@container (max-width: 12px) { .gb-seg:not(.cur) .gb-letter { visibility: hidden; } }
@container (max-width: 64px) { .gb-lab { visibility: hidden; } }
@container gbar (max-width: 699px) { .gb-seg:not(.cur) .gb-letter { visibility: hidden; } }
.guide-stage {
  display: grid; place-content: center; justify-items: center; gap: 12px; min-height: 0;
  text-align: center; cursor: pointer; border-radius: 16px; -webkit-user-select: none; user-select: none; touch-action: manipulation;
}
.guide-ctx { font-size: 15px; color: var(--muted); }
.guide-ctx b { color: var(--ink); }
.guide-move { font-family: var(--font-mono); font-weight: 600; font-size: clamp(72px, 24vw, 220px); line-height: 1; }
.guide-move.is-alg { font-family: var(--font-display); font-weight: 700; font-size: clamp(40px, 10vw, 84px); }
.guide-kind { font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.guide-seq { font-family: var(--font-mono); font-size: clamp(14px, 3.6vw, 22px); max-width: 32ch; line-height: 1.6; }
.guide-next { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; min-height: 32px; }
.guide-next span { font-family: var(--font-mono); font-size: 14px; padding: 4px 9px; border-radius: 7px; border: 1px solid var(--line); color: var(--muted); }
.guide-nav { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.walk {
  display: grid; gap: 10px;
  padding: 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--raise);
}
.walk-nav { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; }
.walk-pos { font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }
.walk-pos b { color: var(--ink); }
.walk-keys { margin-left: auto; font-size: 12px; color: var(--muted); }
.walk-toks { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; }
.walk-lab { font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.walk-empty { margin: 0; font-size: 13px; color: var(--muted); }
.pair { display: inline-flex; gap: 3px; }
.tok {
  font-family: var(--font-display); font-weight: 500; font-size: 13px;
  width: 30px; height: 30px; border-radius: 7px; border: 1px solid var(--line); background: var(--surface);
  cursor: pointer; display: grid; place-items: center; padding: 0;
}
.tok.parity { width: auto; padding: 0 10px; font-family: var(--font-body); font-weight: 700; font-size: 13px; }
.tok.past { color: var(--muted); background: transparent; }
.tok.bad { border-color: var(--accent); border-style: dashed; color: var(--accent); }
.tok[aria-current="true"] { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.result { margin: 0; padding: 10px 12px; border-radius: 9px; font-size: 14px; border: 1px solid var(--line); background: var(--raise); }
.result.ok { border-color: var(--st-F); }
.result.ko { border-color: var(--accent); }
.result:empty { display: none; }
.result .btn { margin-left: 8px; padding: 2px 10px; font-size: 13px; }
.result { display: grid; gap: 6px; }
.result p { margin: 0; }
.score { font-family: var(--font-display); font-weight: 700; font-size: 20px; line-height: 1.1; }
.result code { font-family: var(--font-mono); font-size: 13px; }

/* ---------- Phones: rail becomes a sticky top band ---------- */
@media (max-width: 860px) {
  body { padding-block: 0 32px; }
  body::before {
    content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 10; background: var(--bg);
  }
  .app { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .rail {
    top: env(safe-area-inset-top, 0px);
    z-index: 5;
    background: var(--bg);
    padding-block: 10px;
    border-bottom: 1px solid var(--line);
    gap: 6px;
  }
  .brand { display: none; }
  .rail-toggle { display: inline-block; }
  .alg { padding: 6px 10px; gap: 2px; grid-template-columns: 74px minmax(0, 1fr); align-items: start; column-gap: 8px; }
  .alg-top { display: grid; gap: 0; }
  .alg-name { font-size: 12.5px; line-height: 1.3; }
  .tag { padding: 0 6px; font-size: 10px; justify-self: start; }
  .moves { font-size: 11px; line-height: 1.6; column-gap: 0.5em; }
  .alg-note { display: none; }
  .rail.collapsed .alg { display: none; }
  .mobile-brand { display: block !important; }
  .panel { padding: 14px; }
  .big { width: 68px; height: 68px; font-size: 44px; }
}
.mobile-brand { display: none; }
.to-fr { justify-self: start; display: inline-flex; align-items: center; gap: 5px; font-size: 13px; font-weight: 700; color: var(--accent); text-decoration: none; }
.to-fr:hover { text-decoration: underline; }
.mobile-brand .to-fr { margin-top: 4px; }
.mobile-brand h1 { font-family: var(--font-display); font-weight: 700; font-size: 20px; margin: 10px 0 0; }
@media (max-width: 520px) {
  .fields { grid-template-columns: minmax(0, 1fr); }
  .board { gap: 4px; }
  .key { padding: 6px 5px; }
  .key .k-l { font-size: 16px; }
  .key .k-s { font-size: 9.5px; }
  .row-lab { font-size: 12px; padding-right: 0; }
  .walk { padding: 10px; }
  .walk-keys { display: none; }
  .seg button { padding: 6px 12px; }
}
@media (max-width: 520px) {
  .guide-nav .hint { display: none; }
  .tr-card { gap: 12px; }
  .tr-card .who-text { flex-basis: calc(100% - 80px); }
  .tr-card .spoil { width: 100%; }
}
/* ---------- Menus ---------- */
.view { display: grid; gap: 22px; min-width: 0; }
.tabs {
  position: sticky; top: 0; z-index: 8;
  display: flex; align-items: center; gap: 4px;
  margin-top: -20px; padding: 14px 0 10px;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.tab {
  display: inline-flex; align-items: center; gap: 7px;
  border: 0; background: none; border-radius: 999px;
  padding: 7px 12px; cursor: pointer;
  font-weight: 700; font-size: 14px; color: var(--muted);
}
.tab svg { width: 18px; height: 18px; flex: none; }
.tab:hover { color: var(--ink); background: var(--raise); }
.tab[aria-current="page"] { background: var(--ink); color: var(--bg); }
.tab-ajustes { margin-left: auto; }
.tab-s { display: none; }
.rail-tools { display: inline-flex; align-items: center; gap: 6px; }
.rail-gear {
  display: none; place-items: center; width: 30px; height: 30px; padding: 0;
  border: 1px solid var(--line); border-radius: 999px; background: none; color: var(--muted); cursor: pointer;
}
.rail-gear svg { width: 18px; height: 18px; }
.rail-gear[aria-current="page"] { color: var(--accent); border-color: var(--accent); }
@media (max-width: 1080px) and (min-width: 861px) {
  .tab svg { display: none; }
  .tab { padding: 7px 10px; font-size: 13.5px; }
}

/* ---------- Small shared bits ---------- */
.muted { color: var(--muted); }
.result .sub { color: var(--muted); font-size: 13px; }
.history td .x { padding: 0 3px; }
.x svg { vertical-align: -2px; }
.history tr.me td { background: var(--accent-soft); }
.text-input, .fields select {
  font-family: var(--font-body); font-size: 16px; padding: 9px 11px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--raise); color: var(--ink); min-width: 0; width: 100%;
}
.inrow .text-input { flex: 1 1 200px; width: auto; }
.scr-box {
  margin: 0; font-family: var(--font-mono); font-size: 15px; line-height: 1.7; word-spacing: .12em;
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 9px; background: var(--raise); overflow-wrap: anywhere;
}
.code-box {
  margin: 0; justify-self: start; font-family: var(--font-mono); font-weight: 600; font-size: 20px; letter-spacing: .06em;
  padding: 10px 14px; border: 1px dashed var(--accent); border-radius: 10px; background: var(--raise);
  -webkit-user-select: all; user-select: all;
}
.hint.bad { color: var(--accent); font-weight: 700; }
.linkish {
  background: none; border: 0; padding: 0; cursor: pointer;
  color: var(--muted); text-decoration: underline; font-size: 13px;
}
.panel > p { margin: 0; }
.sync { display: grid; gap: 12px; }
.sync p { margin: 0; }

/* Stream overlay settings */
.stream { display: grid; gap: 12px; }
.stream p { margin: 0; }
.ov-preview {
  position: relative; aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden;
  border: 1px solid var(--line);
  background: radial-gradient(ellipse at 50% 40%, #3a4152 0%, #232834 55%, #161a22 100%);
}
/* color-scheme must match the overlay page's, or Chrome paints the frame opaque in dark mode. */
.ov-preview iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; display: block; background: transparent; z-index: 1; color-scheme: normal; }
.ov-cam {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: rgba(255, 255, 255, .35);
}
.ov-opts { display: flex; flex-wrap: wrap; align-items: end; gap: 12px 20px; }
.ov-opts .field { flex: 0 1 260px; }
.ov-checks { display: flex; flex-wrap: wrap; gap: 8px 18px; padding-bottom: 8px; }
.check { display: inline-flex; align-items: center; gap: 7px; font-size: 14px; cursor: pointer; }
.check input { width: 17px; height: 17px; accent-color: var(--accent); margin: 0; }
.check:has(input:disabled) { opacity: .5; cursor: default; }
.ov-step { display: flex; align-items: center; gap: 10px; margin: 8px 0 0; font-size: 15px; font-weight: 700; }
.ov-step span {
  width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; flex: none;
  font-family: var(--font-display); font-size: 12px; background: var(--ink); color: var(--bg);
}
.hint.ok { color: var(--ok); font-weight: 700; }
.ov-more { border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; background: var(--raise); }
.ov-more summary { cursor: pointer; font-weight: 700; font-size: 14px; }
.ov-more[open] { display: grid; gap: 10px; }
.ov-more p { font-size: 14px; }
.obs-live {
  display: inline-flex; align-items: center; gap: 6px; margin-right: auto;
  font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--accent);
}
.obs-live::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }

/* ---------- Learn ---------- */
.learn { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 20px; align-items: start; }
.lesson-list { display: grid; gap: 3px; position: sticky; top: 76px; }
.lesson-item {
  display: grid; grid-template-columns: 26px minmax(0, 1fr); align-items: center; gap: 9px;
  text-align: left; border: 1px solid transparent; background: none; border-radius: 9px;
  padding: 6px 8px; cursor: pointer; font-size: 14px; line-height: 1.25; color: var(--ink);
}
.lesson-item:hover { border-color: var(--line); }
.lesson-item .num {
  width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center;
  font-family: var(--font-display); font-size: 12px; border: 1px solid var(--line); color: var(--muted); background: var(--raise);
}
.lesson-item.done .num { background: var(--ok); border-color: var(--ok); color: var(--bg); }
.lesson-item[aria-current="true"] { background: var(--raise); border-color: var(--line); font-weight: 700; }
.lesson-item[aria-current="true"] .num { border-color: var(--accent); color: var(--accent); }
.lesson-item.done[aria-current="true"] .num { color: var(--bg); }
.lesson { display: grid; gap: 14px; min-width: 0; }
.lesson-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 14px; }
.lesson-head h3 { margin: 0; font-family: var(--font-display); font-weight: 700; font-size: 18px; line-height: 1.25; }
.lesson-steps { display: flex; gap: 4px; }
.lesson-steps i { display: block; width: 18px; height: 6px; border-radius: 3px; background: var(--line); }
.lesson-steps i.past { background: var(--muted); }
.lesson-steps i.on { background: var(--accent); }
.lesson-text { font-size: 15.5px; max-width: 68ch; }
.lesson-text p { margin: 0 0 8px; }
.lesson-text p:last-child { margin-bottom: 0; }
.lesson-text ol, .lesson-text ul { margin: 0 0 8px; padding-left: 22px; }
.lesson-text li { margin-bottom: 3px; }
.lesson-text code, .task code { font-family: var(--font-mono); font-size: .92em; }
.tut-stage { display: grid; justify-items: center; gap: 10px; container-type: inline-size; }
.net.tap .cell { cursor: pointer; }
.net.tap .cell:hover { filter: brightness(1.08); }
.cell.hl { outline: 2.5px solid var(--accent); outline-offset: 1px; }
.cell.flash-ok { animation: flashOk .55s ease-out; }
.cell.flash-bad { animation: flashBad .55s ease-out; }
@keyframes flashOk { from { box-shadow: 0 0 0 5px var(--ok); } to { box-shadow: 0 0 0 0 transparent; } }
@keyframes flashBad { from { box-shadow: 0 0 0 5px var(--accent); } to { box-shadow: 0 0 0 0 transparent; } }
.lab.center { font-family: var(--font-display); font-weight: 700; opacity: .85; }
.demo-chips { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
.task {
  display: grid; gap: 10px; padding: 14px; border: 1px dashed var(--accent); border-radius: 12px; background: var(--raise);
}
.task-head { font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.task-prompt { margin: 0; font-size: 16px; }
.task-fb { margin: 0; min-height: 1.5em; font-size: 14px; }
.task-fb.ok { color: var(--ok); font-weight: 700; }
.task-fb.ko { color: var(--accent); font-weight: 700; }
.task-fb .linkish { font-weight: 400; margin-left: 4px; }
.choices { display: flex; flex-wrap: wrap; gap: 8px; }
.trace-memo { display: flex; flex-wrap: wrap; gap: 6px 10px; min-height: 32px; align-items: center; }
.trace-memo .tok { cursor: default; }
.task-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.task-tools .guide-opt { margin-left: auto; }
.lesson-nav { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; padding-top: 4px; }
.lesson-nav-right { display: flex; align-items: center; gap: 14px; margin-left: auto; }

/* ---------- Retos ---------- */
.reto-banner {
  display: grid; gap: 10px; padding: 14px; border-radius: 14px;
  border: 1px solid var(--accent); background: var(--accent-soft);
}
.reto-banner .actions { margin: 0; }
#retos { display: grid; gap: 22px; min-width: 0; }
.reto-list { display: grid; gap: 6px; }
.reto-item {
  display: flex; justify-content: space-between; align-items: center; gap: 10px; width: 100%;
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--raise);
  text-align: left; cursor: pointer; font-size: 14px;
}
.reto-item:hover { border-color: var(--muted); }
.reto-row { display: flex; gap: 6px; align-items: stretch; }
.reto-row .reto-item { flex: 1; min-width: 0; }
.reto-del {
  flex: none; min-width: 44px; padding: 0 12px; border: 1px solid var(--line); border-radius: 10px;
  background: var(--raise); color: var(--muted); cursor: pointer; font-size: 18px; line-height: 1;
}
.reto-del:hover { border-color: var(--muted); color: var(--ink); }
.reto-del.armed { border-color: var(--accent); color: var(--accent); font-size: 13px; font-weight: 700; }

/* ---------- Share sheet + toast ---------- */
.sheet {
  position: fixed; inset: 0; z-index: 70; display: grid; place-items: center;
  padding: max(16px, env(safe-area-inset-top, 0px)) 16px max(16px, env(safe-area-inset-bottom, 0px));
  background: rgb(5 7 10 / .6);
}
.sheet-card {
  width: min(440px, 100%); max-height: 100%; overflow: auto; display: grid; gap: 12px;
  padding: 16px; border-radius: 16px; border: 1px solid var(--line); background: var(--surface);
}
.sheet-card h2 { margin: 0; font-size: 17px; }
.share-img { display: block; width: 100%; border-radius: 10px; border: 1px solid var(--line); background: var(--raise); }
.toast {
  position: fixed; left: 50%; transform: translateX(-50%); z-index: 80;
  bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  max-width: calc(100vw - 32px); padding: 9px 16px; border-radius: 999px;
  background: var(--ink); color: var(--bg); font-size: 14px; font-weight: 700;
  box-shadow: 0 6px 24px rgb(0 0 0 / .25);
}
.update-bar {
  position: fixed; left: 50%; transform: translateX(-50%); z-index: 75;
  bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  width: max-content; max-width: calc(100vw - 32px);
  display: flex; align-items: center; gap: 12px;
  padding: 8px 6px 8px 16px; border-radius: 12px;
  background: var(--raise); color: var(--ink); border: 1px solid var(--line);
  box-shadow: 0 8px 28px rgb(0 0 0 / .22);
  font-size: 14px; font-weight: 700;
}
.update-bar .x { font-size: 20px; line-height: 1; padding: 4px 8px; }

/* ---------- Phones: menu at the bottom ---------- */
@media (max-width: 860px) {
  body { padding-bottom: calc(84px + env(safe-area-inset-bottom, 0px)); }
  html { scroll-padding-bottom: calc(84px + env(safe-area-inset-bottom, 0px)); }   /* what scrolls into view, above the menu */
  .tabs {
    position: fixed; top: auto; left: 0; right: 0; bottom: 0; z-index: 30;
    display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 0;
    margin: 0;
    padding: 6px max(6px, env(safe-area-inset-left, 0px)) calc(6px + env(safe-area-inset-bottom, 0px)) max(6px, env(safe-area-inset-right, 0px));
    background: var(--surface); border-top: 1px solid var(--line); border-bottom: 0;
  }
  .tab { flex-direction: column; gap: 3px; padding: 6px 2px; border-radius: 10px; font-size: 10.5px; min-width: 0; }
  .tab span { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .tab svg { display: block; width: 22px; height: 22px; }
  .tab[aria-current="page"] { background: var(--accent-soft); color: var(--accent); }
  .tab:hover { background: none; }
  .tab[aria-current="page"]:hover { background: var(--accent-soft); }
  .tab-ajustes { display: none; }
  .tab .tab-l { display: none; }
  .tab .tab-s { display: inline; }
  .rail-gear { display: inline-grid; }
  .toast, .update-bar { bottom: calc(92px + env(safe-area-inset-bottom, 0px)); }
  .learn { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .lesson-list { position: static; display: flex; gap: 6px; overflow-x: auto; padding-bottom: 2px; scrollbar-width: none; }
  .lesson-item { grid-template-columns: auto; padding: 3px; }
  .lesson-item .t { display: none; }
  .lesson-item .num { width: 32px; height: 32px; font-size: 13px; }
  .lesson-text { font-size: 15px; }
}

/* ---------- Phones on their side (an iPhone 14 leaves 340 px of height): the bottom menu, one slim row ---------- */
@media (max-width: 860px) and (max-height: 500px) and (orientation: landscape) {
  body { padding-bottom: calc(52px + env(safe-area-inset-bottom, 0px)); }
  html { scroll-padding-bottom: calc(52px + env(safe-area-inset-bottom, 0px)); }
  .tabs, .fr .tabs { padding-top: 3px; padding-bottom: calc(3px + env(safe-area-inset-bottom, 0px)); }
  .tab { flex-direction: row; justify-content: center; gap: 6px; padding: 7px 4px; font-size: 12px; }
  .tab svg { width: 18px; height: 18px; flex: none; }
  .toast, .update-bar { bottom: calc(56px + env(safe-area-inset-bottom, 0px)); }
}

@media (prefers-reduced-motion: reduce) {
  .cell, .alg, .guide-bar i { transition: none; }
  .cube-bt { animation: none !important; }
  .cell.flash-ok, .cell.flash-bad { animation: none; }
}

[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
html, body { margin: 0; }
img { max-width: 100%; }
:root { padding-top: env(safe-area-inset-top, 0px); padding-bottom: env(safe-area-inset-bottom, 0px); }

/* The floating «Conectar cubo» (cubefab.js) */
.cube-fab {
  position: fixed; z-index: 40; right: max(16px, env(safe-area-inset-right, 0px));
  bottom: max(16px, env(safe-area-inset-bottom, 0px));
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 18px; border-radius: 999px;
  border: 1px solid var(--accent); background: var(--accent); color: var(--on-accent, #fff);
  font: inherit; font-weight: 700; font-size: 15px; cursor: pointer; box-shadow: 0 6px 20px rgba(0, 0, 0, .25);
}
.cube-fab[hidden] { display: none; }
.cube-fab:disabled { opacity: .85; cursor: default; }
@media print { .cube-fab { display: none; } }
.cube-fab-tip {
  position: fixed; z-index: 40; right: max(16px, env(safe-area-inset-right, 0px)); max-width: min(360px, calc(100vw - 32px));
  padding: 10px 14px; border-radius: 12px; background: var(--ink); color: var(--bg); font-size: 14px; line-height: 1.4;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .25);
}
.cube-fab-tip[hidden] { display: none; }
@media (max-width: 860px) and (max-height: 500px) and (orientation: landscape) { .cube-fab { padding: 8px 14px; font-size: 14px; } }

/* smartcube.js: another section shown over this page, which lends it the smart cube's connection */
html.sc-hosting, html.sc-hosting body { overflow: hidden; }
html.sc-hosting body > :not(.sc-frame) { display: none !important; }
.sc-frame { position: fixed; inset: 0; width: 100%; height: 100%; border: 0; background: var(--bg); z-index: 2147483647; }