.mfi-page { max-width: 1000px; }
.mfi-intro { max-width: 900px; margin-bottom: 22px; }
.mfi-intro h1 { font-size: clamp(2.35rem, 5.5vw, 4.65rem); }
.mfi-intro .lede { max-width: 850px; }

.mfi-welcome,
.mfi-game,
.mfi-complete {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
}
.mfi-welcome { padding: 26px; }
.mfi-welcome-copy { max-width: 800px; }
.mfi-welcome-copy h2 { margin: 0 0 8px; font-size: clamp(1.55rem, 3vw, 2.15rem); }
.mfi-welcome-copy p:last-child { margin-bottom: 0; color: var(--muted); line-height: 1.58; }

.mfi-welcome-actions,
.mfi-complete-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 20px;
}
.mfi-text-link { text-decoration: none; text-align: center; }

.mfi-game { overflow: hidden; }
.mfi-game-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px 13px;
}
.mfi-game-top h2 { margin: 0; font-size: 1.25rem; }
.mfi-game-top .section-kicker { margin-bottom: 4px; }
.mfi-progress { padding: 0 22px 18px; display: flex; align-items: center; gap: 12px; }
.mfi-progress-track { flex: 1 1 auto; height: 6px; overflow: hidden; border-radius: 99px; background: #eceee7; }
.mfi-progress-track span { display: block; width: 0; height: 100%; background: var(--accent); transition: width .22s ease; }
.mfi-progress > span { flex: 0 0 auto; color: var(--muted); font-size: .68rem; font-weight: 850; }

.mfi-scenario-card {
  display: grid;
  grid-template-columns: .75fr 1.25fr;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #f8f9f5;
}
.mfi-scenario-card > div { min-width: 0; padding: 15px 20px; }
.mfi-scenario-card > div + div { border-left: 1px solid var(--line); }
.mfi-scenario-label { display: block; margin-bottom: 4px; color: var(--muted); font-size: .59rem; font-weight: 900; letter-spacing: .065em; }
.mfi-scenario-card strong { display: block; font-size: 1rem; }
#mfiGivenDimension { font-size: 1.55rem; letter-spacing: -.035em; }

.mfi-layout-card { padding: 20px 22px; border-bottom: 1px solid var(--line); }
.mfi-layout-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 10px; }
.mfi-layout-heading span { color: #72796e; font-size: .62rem; font-weight: 900; letter-spacing: .07em; }
.mfi-layout-heading strong { color: var(--muted); font-size: .72rem; text-align: right; }
.mfi-svg-wrap { overflow: hidden; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.mfi-svg { display: block; width: 100%; height: auto; min-height: 360px; }
.mfi-drawing-key { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 9px; color: var(--muted); font-size: .65rem; }
.mfi-drawing-key span { display: inline-flex; align-items: center; gap: 6px; }
.mfi-drawing-key i { width: 17px; height: 5px; border-radius: 99px; display: inline-block; }
.mfi-key-finish { background: #30372e; }
.mfi-key-track { background: #a9be18; }
.mfi-key-gwb { height: 11px !important; border: 1px solid #aeb4a8; background: #eef0e9; }

.mfi-question-card { padding: 22px; }
.mfi-question-head { display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start; }
.mfi-step-badge { min-width: 65px; padding: 7px 9px; border-radius: 999px; background: var(--dark); color: #fff; text-align: center; font-size: .6rem; font-weight: 900; letter-spacing: .06em; }
.mfi-question-head h2 { margin: 0 0 4px; font-size: 1.2rem; }
.mfi-question-head p { margin: 0; color: var(--muted); font-size: .83rem; line-height: 1.52; }
.mfi-answer-area { margin-top: 16px; }
.mfi-choice-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 9px; }
.mfi-choice-grid.mfi-four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.mfi-choice-grid.mfi-two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.mfi-choice-grid button {
  min-height: 74px;
  padding: 12px;
  border: 1px solid #cfd3ca;
  border-radius: 12px;
  background: #fff;
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color .14s ease, background .14s ease, transform .14s ease;
}
.mfi-choice-grid button:hover { border-color: #aeb4a8; transform: translateY(-1px); }
.mfi-choice-grid button:focus-visible { outline: 3px solid rgba(229, 255, 80, .6); outline-offset: 2px; }
.mfi-choice-grid button.is-selected { border-color: #8fa00f; background: #f8fadf; box-shadow: inset 0 0 0 1px #8fa00f; }
.mfi-choice-grid strong { display: block; font-size: .84rem; line-height: 1.25; }
.mfi-choice-grid small { display: block; margin-top: 4px; color: var(--muted); font-size: .65rem; line-height: 1.38; }

.mfi-dimension-entry { max-width: 430px; }
.mfi-answer-display {
  min-height: 68px;
  margin-bottom: 9px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #f8f9f5;
  display: grid;
  place-items: center;
}
.mfi-answer-display strong { font-size: 1.75rem; letter-spacing: -.04em; }
.mfi-entry-parts { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; margin-bottom: 8px; }
.mfi-entry-part {
  min-height: 57px;
  padding: 8px;
  border: 2px solid var(--line);
  border-radius: 11px;
  background: #fff;
  color: var(--text);
  font: inherit;
  cursor: pointer;
}
.mfi-entry-part span { display: block; color: var(--muted); font-size: .55rem; font-weight: 900; letter-spacing: .06em; }
.mfi-entry-part strong { display: block; margin-top: 2px; font-size: 1.3rem; }
.mfi-entry-part.is-active { border-color: #91a20e; background: #f8fadf; }
.mfi-pad-heading { display: flex; justify-content: space-between; gap: 8px; margin: 7px 1px 4px; }
.mfi-pad-heading span { font-size: .56rem; font-weight: 900; letter-spacing: .055em; }
.mfi-pad-heading small { color: var(--muted); font-size: .54rem; }
.mfi-whole-pad { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 5px; }
.mfi-fraction-pad { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 5px; }
.mfi-whole-pad button,
.mfi-fraction-pad button {
  min-height: 35px;
  min-width: 0;
  border: 1px solid #cfd3ca;
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  font: inherit;
  font-size: .68rem;
  font-weight: 850;
  cursor: pointer;
}
.mfi-whole-pad button:hover,
.mfi-fraction-pad button:hover { background: #f4f6ef; }
.mfi-whole-pad button[data-action] { color: var(--muted); font-size: .56rem; }
.mfi-fraction-pad button.is-selected { border-color: #778116; background: var(--accent); }

.mfi-feedback { margin-top: 12px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px; font-size: .78rem; line-height: 1.5; }
.mfi-feedback.is-correct { border-color: #d7e77d; background: #f3f7d8; }
.mfi-feedback.is-wrong { border-color: #efc8bf; background: #fff4f1; }
.mfi-question-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }

.mfi-complete { margin-top: 0; padding: 27px; }
.mfi-complete h2 { margin: 0 0 8px; font-size: clamp(1.55rem, 3vw, 2.15rem); }
.mfi-complete > p:not(.section-kicker) { max-width: 790px; color: var(--muted); line-height: 1.58; }
.mfi-complete-math { display: grid; gap: 7px; margin-top: 16px; padding: 16px 18px; border-left: 4px solid var(--accent); border-radius: 0 12px 12px 0; background: #f8f9f5; font-size: .82rem; line-height: 1.48; }

/* Drawing */
.mfi-bg { fill: #fff; }
.mfi-gwb { fill: #eef0e9; stroke: #aeb4a8; stroke-width: 1.2; }
.mfi-track { fill: #f4f8cd; stroke: #20261f; stroke-width: 2.2; }
.mfi-material { fill: #30372e; font-size: 10px; font-weight: 900; text-anchor: middle; dominant-baseline: middle; paint-order: stroke; stroke: rgba(255,255,255,.9); stroke-width: 3px; }
.mfi-wall-label { fill: #666d63; font-size: 10px; font-weight: 900; letter-spacing: .06em; text-anchor: middle; }
.mfi-face-label { fill: #6f756b; font-size: 9px; font-weight: 900; letter-spacing: .055em; text-anchor: middle; }
.mfi-dim-line { stroke: #60675c; stroke-width: 1.6; }
.mfi-dim-extension { stroke: #b5bab0; stroke-width: 1.1; }
.mfi-dim-tick { stroke: #60675c; stroke-width: 2; }
.mfi-dim-text { fill: #30372e; font-size: 17px; font-weight: 950; text-anchor: middle; paint-order: stroke; stroke: #fff; stroke-width: 5px; }
.mfi-finish-point { fill: #30372e; }
.mfi-target-edge { stroke: #a9be18; stroke-width: 5; }
.mfi-target-line { stroke: #8ba013; stroke-width: 2.2; }
.mfi-target-tick { stroke: #8ba013; stroke-width: 3; }
.mfi-target-text { fill: #68740c; font-size: 22px; font-weight: 950; text-anchor: middle; paint-order: stroke; stroke: #fff; stroke-width: 5px; }
.mfi-target-caption { fill: #68740c; font-size: 10px; font-weight: 900; letter-spacing: .055em; text-anchor: middle; }
.mfi-axis-line { stroke: #4c5549; stroke-width: 2; stroke-dasharray: 8 7; }
.mfi-axis-pill { fill: #f4f6ef; stroke: #d9ddd2; stroke-width: 1.2; }
.mfi-axis-text { fill: #30372e; font-size: 11px; font-weight: 950; text-anchor: middle; }
.mfi-reveal-arrow { stroke: #8ba013; stroke-width: 3; marker-end: url(#mfiArrow); }
.mfi-reveal-text { fill: #68740c; font-size: 12px; font-weight: 950; text-anchor: middle; paint-order: stroke; stroke: #fff; stroke-width: 4px; }
.mfi-adjust-pill { fill: #f6f9d7; stroke: #cbdc65; stroke-width: 1.3; }
.mfi-adjust-text { fill: #5d6810; font-size: 12px; font-weight: 950; text-anchor: middle; }

@media (max-width: 760px) {
  .mfi-page { padding-top: 30px; }
  .mfi-intro { margin-bottom: 16px; }
  .mfi-intro h1 { font-size: clamp(2.05rem, 10.5vw, 3.2rem); }
  .mfi-intro .lede { font-size: .89rem; line-height: 1.5; }
  .mfi-welcome { padding: 18px 15px; border-radius: 16px; }
  .mfi-welcome-actions { display: grid; grid-template-columns: 1fr; }
  .mfi-welcome-actions .primary-button,
  .mfi-welcome-actions .subtle-button { width: 100%; }

  .mfi-game { border-radius: 15px; }
  .mfi-game-top { padding: 13px 12px 9px; }
  .mfi-game-top h2 { font-size: .95rem; }
  .mfi-game-top .subtle-button { padding: 7px 9px; font-size: .67rem; }
  .mfi-progress { padding: 0 12px 11px; }
  .mfi-scenario-card { grid-template-columns: 1fr; }
  .mfi-scenario-card > div { padding: 10px 12px; }
  .mfi-scenario-card > div + div { border-left: 0; border-top: 1px solid var(--line); }
  #mfiGivenDimension { font-size: 1.25rem; }
  .mfi-scenario-card strong { font-size: .82rem; }

  .mfi-layout-card { padding: 11px 10px; }
  .mfi-layout-heading { align-items: flex-start; flex-direction: column; gap: 2px; margin-bottom: 7px; }
  .mfi-layout-heading strong { font-size: .62rem; text-align: left; }
  .mfi-svg-wrap { border-radius: 12px; }
  .mfi-svg { min-height: 0; }
  .mfi-drawing-key { gap: 9px; font-size: .57rem; }
  .mfi-material { font-size: 8px; stroke-width: 2.5px; }
  .mfi-wall-label { font-size: 9px; }
  .mfi-face-label { font-size: 8px; }
  .mfi-dim-text { font-size: 16px; }
  .mfi-target-text { font-size: 21px; }

  .mfi-question-card { padding: 14px 12px; }
  .mfi-question-head { grid-template-columns: 1fr; gap: 8px; }
  .mfi-step-badge { width: max-content; min-width: 0; }
  .mfi-question-head h2 { font-size: 1.05rem; }
  .mfi-question-head p { font-size: .74rem; }
  .mfi-choice-grid,
  .mfi-choice-grid.mfi-four,
  .mfi-choice-grid.mfi-two { grid-template-columns: 1fr 1fr; gap: 7px; }
  .mfi-choice-grid button { min-height: 66px; padding: 9px; }
  .mfi-choice-grid strong { font-size: .75rem; }
  .mfi-choice-grid small { font-size: .59rem; }
  .mfi-dimension-entry { max-width: none; }
  .mfi-whole-pad button,
  .mfi-fraction-pad button { min-height: 34px; }
  .mfi-question-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .mfi-question-actions .primary-button,
  .mfi-question-actions .subtle-button { width: 100%; }
  .mfi-question-actions #mfiContinue { grid-column: 1 / -1; }
  .mfi-feedback { font-size: .7rem; }

  .mfi-complete { padding: 20px 16px; border-radius: 16px; }
  .mfi-complete-actions { display: grid; grid-template-columns: 1fr; }
  .mfi-complete-actions .primary-button,
  .mfi-complete-actions .subtle-button { width: 100%; }
}

@media (max-width: 430px) {
  .mfi-choice-grid,
  .mfi-choice-grid.mfi-four,
  .mfi-choice-grid.mfi-two { grid-template-columns: 1fr; }
  .mfi-whole-pad { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .mfi-fraction-pad { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .mfi-drawing-key { display: grid; grid-template-columns: 1fr; gap: 5px; }
}