.area-trainer-intro { max-width: 850px; }
.area-rules {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: -8px 0 22px;
}
.area-rules span {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--panel);
  color: var(--muted);
  font-size: .79rem;
  line-height: 1.35;
}
.area-rules strong { display: block; margin-bottom: 2px; color: var(--text); font-size: .86rem; }

.area-trainer-shell {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}
.area-trainer-topbar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-bottom: 1px solid var(--line);
}
.area-stat,
.area-timer-stat {
  min-height: 72px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 6px;
  padding: 15px;
  border-right: 1px solid var(--line);
}
.area-timer-stat { background: #f8f9f3; }
.area-stat:last-child { border-right: 0; }
.area-stat span,
.area-timer-stat span {
  color: var(--muted);
  font-size: .72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .055em;
}
.area-stat strong,
.area-timer-stat strong { font-size: 1.55rem; letter-spacing: -.04em; }
.area-timer-stat em { color: var(--muted); font-size: .72rem; font-style: normal; font-weight: 700; }
.area-timer-track { height: 5px; background: #eceee5; }
.area-timer-track span { display: block; width: 100%; height: 100%; background: var(--accent); transform-origin: left center; transition: width .1s linear, background .15s ease; }
.area-timer-track span.is-low { background: #ffbb64; }

.area-game-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, .55fr);
  min-height: 575px;
}
.area-plan-panel { min-width: 0; padding: 24px; border-right: 1px solid var(--line); }
.area-answer-panel { padding: 24px; background: #fbfcf8; }
.area-plan-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.area-plan-head h2 { margin: 0; font-size: 1.22rem; }
.area-round-tools { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: .72rem; white-space: nowrap; }
.area-round-tools strong { color: var(--text); }
.area-reset { padding: 8px 11px; }

.area-canvas-wrap {
  margin-top: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}
.area-svg { display: block; width: 100%; height: auto; min-height: 410px; }
.area-shape { fill: #f8fbdc; stroke: #20261f; stroke-width: 4; stroke-linejoin: round; }
.area-shape-inner { fill: none; stroke: #b7bf77; stroke-width: 1.25; stroke-dasharray: 6 6; }
.area-dim { stroke: #62695f; stroke-width: 1.5; }
.area-dim-extension { stroke: #b7bbb2; stroke-width: 1.1; }
.area-dim-tick { stroke: #62695f; stroke-width: 2; }
.area-dim-text {
  fill: #333a31;
  font-size: 17px;
  font-weight: 850;
  text-anchor: middle;
  dominant-baseline: central;
  paint-order: stroke;
  stroke: #fff;
  stroke-width: 5px;
  stroke-linejoin: round;
}
.area-plan-caption { fill: #73786f; font-size: 12px; font-weight: 800; letter-spacing: .06em; }
.area-shape-name { fill: #565d52; font-size: 12px; font-weight: 900; letter-spacing: .09em; text-anchor: middle; }
.area-plan-note { margin: 10px 0 0; color: var(--muted); font-size: .74rem; line-height: 1.5; }

.area-answer-panel > .section-kicker { margin-bottom: 8px; }
.area-answer-display {
  display: flex;
  align-items: baseline;
  gap: 9px;
  min-height: 84px;
  margin-bottom: 18px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: #fff;
}
.area-answer-display strong { font-size: 2.25rem; letter-spacing: -.05em; }
.area-answer-display span { color: var(--muted); font-size: .8rem; font-weight: 850; }
.area-desktop-entry label { display: block; margin-bottom: 7px; color: var(--muted); font-size: .68rem; font-weight: 850; letter-spacing: .06em; }
.area-answer-input {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}
.area-answer-input:focus-within { outline: 3px solid var(--accent-soft); border-color: #9da74b; }
.area-answer-input input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  padding: 13px 0;
  color: var(--text);
  font: inherit;
  font-size: 1.05rem;
  font-weight: 850;
}
.area-answer-input input:disabled { color: #9b9e96; }
.area-answer-input span { color: var(--muted); font-size: .75rem; font-weight: 850; }
.area-desktop-entry p { margin: 7px 0 0; color: var(--muted); font-size: .7rem; }
.area-mobile-entry { display: none; }
.area-primary { width: 100%; min-height: 48px; margin-top: 14px; }
.area-feedback {
  margin-top: 12px;
  padding: 12px 13px;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: .78rem;
  line-height: 1.5;
}
.area-feedback strong { font-weight: 900; }
.area-feedback.is-correct { background: #f3f7d8; border-color: #d7e77d; }
.area-feedback.is-wrong { background: #fff4f1; border-color: #efc8bf; }
.area-feedback.is-summary { background: #f6f7f2; }
.area-why { margin-top: 7px; }
.area-why summary { cursor: pointer; color: #555b4f; font-weight: 850; }
.area-why p { margin: 7px 0 0; color: #555b4f; }
.area-trainer-shell + .resource-inline-callout { margin-top: 22px; }

@media (max-width: 920px) {
  .area-game-grid { grid-template-columns: 1fr; }
  .area-plan-panel { border-right: 0; border-bottom: 1px solid var(--line); }
  .area-answer-panel { background: #fff; }
}

@media (max-width: 680px) {
  .area-trainer-page { padding-top: 30px; }
  .area-trainer-intro { margin-bottom: 18px; }
  .area-trainer-intro h1 { font-size: clamp(2.15rem, 11vw, 3.2rem); }
  .area-trainer-intro .lede { font-size: .92rem; line-height: 1.5; }
  .area-rules {
    grid-template-columns: 1fr 1fr;
    gap: 7px;
    margin: -2px 0 14px;
  }
  .area-rules span { padding: 9px 10px; font-size: .67rem; }
  .area-rules strong { font-size: .75rem; }

  .area-trainer-shell { border-radius: 15px; }
  .area-trainer-topbar { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .area-stat,
  .area-timer-stat {
    min-height: 49px;
    gap: 3px;
    padding: 8px 4px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }
  .area-stat span,
  .area-timer-stat span { font-size: .55rem; letter-spacing: .04em; }
  .area-stat strong,
  .area-timer-stat strong { font-size: 1.12rem; line-height: 1; }
  .area-timer-stat em { display: none; }
  .area-timer-track { height: 4px; }

  .area-plan-panel { padding: 11px; }
  .area-plan-head { align-items: center; gap: 8px; }
  .area-plan-head .section-kicker { margin-bottom: 3px; font-size: .6rem; }
  .area-plan-head h2 { font-size: .92rem; }
  .area-round-tools { gap: 7px; font-size: .59rem; }
  .area-reset { padding: 6px 7px; font-size: .59rem; }
  .area-canvas-wrap { margin-top: 9px; border-radius: 12px; }
  .area-svg { min-height: 0; }
  .area-plan-note { margin-top: 6px; font-size: .61rem; }
  .area-dim-text { font-size: 15px; }

  .area-answer-panel { padding: 10px 11px 12px; }
  .area-answer-panel > .section-kicker { display: none; }
  .area-answer-display {
    justify-content: center;
    min-height: 52px;
    margin-bottom: 7px;
    padding: 7px 10px;
  }
  .area-answer-display strong { font-size: 1.7rem; }
  .area-answer-display span { font-size: .67rem; }
  .area-desktop-entry { display: none; }
  .area-mobile-entry { display: block; }
  .area-mobile-pad {
    padding: 7px;
    border: 1px solid var(--line);
    border-radius: 11px;
    background: #f8f9f3;
    transition: opacity .12s ease;
  }
  .area-mobile-pad.is-disabled { opacity: .48; pointer-events: none; }
  .area-pad-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 5px; padding: 0 2px; }
  .area-pad-heading span { color: var(--text); font-size: .56rem; font-weight: 900; letter-spacing: .05em; }
  .area-pad-heading small { color: var(--muted); font-size: .53rem; }
  .area-whole-pad {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 5px;
    padding: 1px;
  }
  .area-whole-pad button {
    width: 100%;
    height: 35px;
    border: 1px solid #cfd3ca;
    border-radius: 9px;
    background: #fff;
    color: var(--text);
    font: inherit;
    font-size: .72rem;
    font-weight: 850;
    cursor: pointer;
  }
  .area-whole-pad button[data-action] { color: var(--muted); font-size: .61rem; }
  .area-feedback { margin-top: 7px; padding: 8px 10px; font-size: .68rem; }
  .area-primary { min-height: 44px; margin-top: 7px; }
}

@media (max-width: 380px) {
  .area-rules span { font-size: .63rem; }
  .area-plan-head h2 { font-size: .86rem; }
  .area-round-tools > span { display: none; }
  .area-dim-text { font-size: 14px; }
}


/* Trainer workbench calculator */
.area-calculator-open { width: 100%; min-height: 42px; margin-top: 14px; }
.area-calculator-note { margin: 6px 0 0; color: var(--muted); font-size: .68rem; text-align: center; }
.area-calculator-workbench {
  display: none;
  margin-top: 10px;
  overflow: hidden;
  border: 1px solid #c9cdc3;
  border-radius: 14px;
  background: #fbfcf8;
}
.area-calculator-workbench.is-open { display: block; }
.area-answer-panel.is-calculator-open .area-calculator-open,
.area-answer-panel.is-calculator-open .area-calculator-note { display: none; }
.area-answer-panel.is-calculator-open .area-desktop-entry,
.area-answer-panel.is-calculator-open .area-mobile-entry { display: none; }
.area-calculator-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 11px 12px; border-bottom: 1px solid var(--line); }
.area-calculator-head span { display: block; color: var(--muted); font-size: .62rem; font-weight: 900; letter-spacing: .07em; }
.area-calculator-head strong { display: block; margin-top: 2px; font-size: .74rem; line-height: 1.35; }
.area-calculator-close { min-height: 32px; padding: 6px 10px; border: 1px solid var(--line); border-radius: 9px; background: #fff; color: var(--text); font: inherit; font-size: .68rem; font-weight: 850; cursor: pointer; }
.area-calculator-values { padding: 9px 11px; border-bottom: 1px solid var(--line); background: #f8f9f4; }
.area-calculator-values-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 6px; }
.area-calculator-values-head span { color: var(--muted); font-size: .58rem; font-weight: 900; letter-spacing: .065em; }
.area-calculator-values-head small { color: var(--muted); font-size: .58rem; }
.area-calculator-value-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.area-calculator-value-chips button { min-height: 32px; padding: 6px 8px; border: 1px solid #cfd3ca; border-radius: 9px; background: #fff; color: var(--text); font: inherit; font-size: .68rem; font-weight: 800; cursor: pointer; }
.area-calculator-value-chips button:hover:not(:disabled) { background: #f2f5eb; border-color: #aeb5a6; }
.area-calculator-value-chips button:disabled { opacity: .48; cursor: default; }
.area-calculator-value-chips button span { display: block; color: var(--muted); font-size: .52rem; font-weight: 850; letter-spacing: .04em; }
.area-calculator-value-chips button strong { display: block; margin-top: 1px; font-size: .76rem; }
.area-calculator-display { min-height: 68px; display: flex; flex-direction: column; align-items: flex-end; justify-content: center; padding: 10px 13px; border-bottom: 1px solid var(--line); background: #fff; }
.area-calculator-display small { min-height: 17px; color: var(--muted); font-size: .68rem; text-align: right; }
.area-calculator-display strong { max-width: 100%; overflow: hidden; text-overflow: ellipsis; font-size: 1.7rem; letter-spacing: -.04em; }
.area-calculator-keys { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; padding: 9px 11px; }
.area-calculator-keys button { min-height: 39px; border: 1px solid var(--line); border-radius: 9px; background: #fff; color: var(--text); font: inherit; font-size: .84rem; font-weight: 820; cursor: pointer; }
.area-calculator-keys button:hover:not(:disabled) { background: #f4f6ef; }
.area-calculator-keys button[data-calc-operator],
.area-calculator-keys .area-calc-equals { background: #eef1e8; }
.area-calculator-keys .area-calc-zero { grid-column: span 3; }
.area-calculator-footer { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 11px; border-top: 1px solid var(--line); background: #f8f9f4; }
.area-calculator-footer span { color: var(--muted); font-size: .62rem; line-height: 1.35; }
.area-calculator-use { min-height: 34px; padding: 6px 10px; white-space: nowrap; }

@media (max-width: 680px) {
  .area-answer-panel.is-calculator-open .area-mobile-entry { display: none; }
  .area-answer-panel.is-calculator-open .area-answer-display { margin-bottom: 4px; }
  .area-calculator-workbench { margin-top: 7px; border-radius: 11px; }
  .area-calculator-head { padding: 8px 9px; }
  .area-calculator-head strong { font-size: .68rem; }
  .area-calculator-values { padding: 7px 8px; }
  .area-calculator-value-chips { gap: 5px; }
  .area-calculator-value-chips button { min-height: 30px; padding: 5px 7px; }
  .area-calculator-display { min-height: 56px; padding: 7px 10px; }
  .area-calculator-display strong { font-size: 1.48rem; }
  .area-calculator-keys { gap: 5px; padding: 7px 8px; }
  .area-calculator-keys button { min-height: 35px; }
  .area-calculator-footer { padding: 8px; }
}