.interactive-ceiling-page { max-width: 980px; }
.interactive-intro { max-width: 860px; margin-bottom: 22px; }
.interactive-intro h1 { font-size: clamp(2.35rem, 5.5vw, 4.65rem); }
.interactive-intro .lede { max-width: 820px; }

.interactive-welcome,
.interactive-game,
.interactive-complete {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
}

.interactive-welcome { padding: 26px; }
.interactive-welcome-copy { max-width: 760px; }
.interactive-welcome-copy h2 { margin-bottom: 8px; font-size: clamp(1.55rem, 3vw, 2.15rem); }
.interactive-welcome-copy p:last-child { margin-bottom: 0; color: var(--muted); line-height: 1.55; }

.interactive-method-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.interactive-method-grid > div {
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #f8f9f5;
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 10px;
  row-gap: 3px;
  align-items: start;
}
.interactive-method-grid span {
  grid-row: 1 / span 2;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--dark);
  color: var(--accent);
  font-size: .72rem;
  font-weight: 900;
}
.interactive-method-grid strong { font-size: .9rem; }
.interactive-method-grid small { color: var(--muted); line-height: 1.4; }
.interactive-welcome-actions,
.interactive-complete-actions {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}
.interactive-text-link { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }

.interactive-game { padding: 22px; }
.interactive-game-top { display: flex; align-items: end; justify-content: space-between; gap: 16px; }
.interactive-game-top h2 { margin: 0; font-size: 1.55rem; }
.interactive-game-top .section-kicker { margin-bottom: 5px; }

.interactive-progress { margin-top: 14px; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 12px; }
.interactive-progress-track { height: 7px; overflow: hidden; border-radius: 999px; background: #e9ebe5; }
.interactive-progress-track span { display: block; width: 0; height: 100%; border-radius: inherit; background: var(--dark); transition: width .2s ease; }
.interactive-progress > span { color: var(--muted); font-size: .74rem; font-weight: 850; }

.interactive-scenario-card {
  margin-top: 14px;
  padding: 14px 16px;
  border: 1px solid #dce887;
  border-radius: 14px;
  background: var(--accent-soft);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.interactive-scenario-card > div { display: grid; gap: 3px; }
.interactive-scenario-label { color: #686e4d; font-size: .62rem; font-weight: 900; letter-spacing: .09em; }
.interactive-scenario-card strong { font-size: 1.02rem; }

.interactive-layout-card {
  margin-top: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #f8f9f5;
}
.interactive-layout-heading {
  min-height: 54px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.interactive-layout-heading span { color: var(--muted); font-size: .64rem; font-weight: 900; letter-spacing: .09em; }
.interactive-layout-heading strong { font-size: .82rem; text-align: right; }
.interactive-ceiling-svg { width: 100%; height: auto; display: block; font-family: Inter, ui-sans-serif, system-ui, sans-serif; }
.interactive-ceiling-svg .room-outline { fill: #fff; stroke: #1c211a; stroke-width: 3; }
.interactive-ceiling-svg .tile { fill: #d9dcd5; stroke: #aeb3aa; stroke-width: 1.4; }
.interactive-ceiling-svg .border { fill: #e5ff50; stroke: #bdcf35; stroke-width: 1.5; }
.interactive-ceiling-svg .center-tile { fill: #f4ffc2; stroke: #8b9b24; stroke-width: 2.3; }
.interactive-ceiling-svg .grid-line { stroke: #949b90; stroke-width: 1.4; }
.interactive-ceiling-svg .cross-line { stroke: #c2c7bd; stroke-width: 1.2; }
.interactive-ceiling-svg .center-line { stroke: #181a17; stroke-width: 3; stroke-dasharray: 8 6; }
.interactive-ceiling-svg .dim-line { stroke: #6d716a; stroke-width: 2; }
.interactive-ceiling-svg .witness { stroke: #a4aaa0; stroke-width: 1.5; }
.interactive-ceiling-svg .dim-text { fill: #181a17; font-size: 24px; font-weight: 900; text-anchor: middle; }
.interactive-ceiling-svg .svg-label { fill: #555b52; font-size: 20px; font-weight: 850; text-anchor: middle; }
.interactive-ceiling-svg .svg-small { fill: #6d716a; font-size: 16px; font-weight: 760; text-anchor: middle; }
.interactive-ceiling-svg .border-text { fill: #3f4616; font-size: 16px; font-weight: 900; text-anchor: middle; }
.interactive-ceiling-svg .tile-number { fill: #4f554c; font-size: 17px; font-weight: 900; text-anchor: middle; dominant-baseline: middle; }
.interactive-ceiling-svg .plan-center-label { fill: #181a17; font-size: 18px; font-weight: 900; text-anchor: middle; }

.interactive-question-card {
  margin-top: 14px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}
.interactive-question-head { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 13px; align-items: start; }
.interactive-step-badge {
  min-width: 64px;
  padding: 7px 9px;
  border-radius: 999px;
  background: var(--dark);
  color: var(--accent);
  font-size: .64rem;
  font-weight: 900;
  letter-spacing: .08em;
  text-align: center;
}
.interactive-question-head h2 { margin: 0 0 5px; font-size: 1.35rem; }
.interactive-question-head p { margin: 0; max-width: 720px; color: var(--muted); line-height: 1.5; }
.interactive-answer-area { margin-top: 18px; }

.interactive-dimension-entry {
  display: grid;
  grid-template-columns: minmax(0, 130px) auto minmax(0, 130px) minmax(150px, 1fr);
  align-items: end;
  gap: 8px;
  max-width: 610px;
}
.interactive-dimension-entry label,
.interactive-number-entry label { display: grid; gap: 6px; }
.interactive-dimension-entry label > span,
.interactive-number-entry label > span { color: var(--muted); font-size: .68rem; font-weight: 850; letter-spacing: .04em; }
.interactive-dimension-entry input,
.interactive-number-entry input {
  width: 100%;
  min-height: 48px;
  padding: 10px 11px;
  border: 1px solid #cfd3ca;
  border-radius: 11px;
  background: #fff;
  color: var(--text);
  font-size: 1.08rem;
  font-weight: 800;
  outline: none;
}
.interactive-dimension-entry input:focus,
.interactive-number-entry input:focus { border-color: #89907f; box-shadow: 0 0 0 3px rgba(229,255,80,.26); }
.interactive-dimension-mark { padding-bottom: 12px; font-size: 1.15rem; font-weight: 900; }
.interactive-fraction-wrap { display: grid; gap: 6px; }
.interactive-fraction-wrap > span { color: var(--muted); font-size: .68rem; font-weight: 850; letter-spacing: .04em; }
.interactive-fraction-options { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 5px; }
.interactive-fraction-options button,
.interactive-choice-grid button {
  border: 1px solid var(--line);
  border-radius: 11px;
  background: #f8f9f5;
  color: var(--text);
  font-weight: 820;
}
.interactive-fraction-options button { min-height: 48px; padding: 8px 5px; }
.interactive-fraction-options button.is-selected,
.interactive-choice-grid button.is-selected { border-color: #aebe2d; background: var(--accent-soft); }
.interactive-number-entry { max-width: 180px; }
.interactive-mobile-keypad { display: none; }
.interactive-keypad-targets { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 7px; margin-bottom: 7px; }
.interactive-keypad-targets button,
.interactive-keypad-grid button {
  border: 1px solid var(--line);
  border-radius: 11px;
  background: #f8f9f5;
  color: var(--text);
  font-weight: 850;
}
.interactive-keypad-targets button.is-selected { border-color: #aebe2d; background: var(--accent-soft); }
.interactive-keypad-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 7px; }
.interactive-keypad-grid button { min-height: 48px; padding: 9px; font-size: 1rem; }
.interactive-dimension-entry input.is-keypad-active,
.interactive-number-entry input.is-keypad-active { border-color: #89907f; box-shadow: 0 0 0 3px rgba(229,255,80,.26); }
.interactive-choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; max-width: 620px; }
.interactive-choice-grid button { min-height: 54px; padding: 11px 13px; text-align: left; }
.interactive-choice-grid button strong { display: block; font-size: .92rem; }
.interactive-choice-grid button small { display: block; margin-top: 3px; color: var(--muted); font-weight: 650; line-height: 1.35; }

.interactive-feedback {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 12px;
  line-height: 1.48;
  font-size: .86rem;
}
.interactive-feedback.is-correct { border: 1px solid #dce887; background: var(--accent-soft); color: #414620; }
.interactive-feedback.is-wrong { border: 1px solid #e0cfc6; background: #fff7f2; color: #6d4b3e; }
.interactive-feedback strong { color: var(--text); }
.interactive-question-actions { margin-top: 15px; display: flex; flex-wrap: wrap; gap: 8px; }

.interactive-complete { margin-top: 18px; padding: 26px; }
.interactive-complete h2 { margin-bottom: 8px; font-size: clamp(1.7rem, 3.5vw, 2.35rem); }
.interactive-complete > p:not(.section-kicker) { max-width: 760px; color: var(--muted); line-height: 1.55; }
.interactive-complete-math { margin-top: 15px; display: grid; gap: 7px; max-width: 760px; }
.interactive-complete-math div { padding: 10px 12px; border: 1px solid var(--line); border-radius: 11px; background: #f8f9f5; font-size: .84rem; }
.interactive-complete-math strong { color: var(--text); }

@media (max-width: 760px) {
  .interactive-ceiling-page { padding-top: 34px; }
  .interactive-intro { margin-bottom: 16px; }
  .interactive-intro h1 { font-size: clamp(2.05rem, 10.5vw, 3.15rem); line-height: 1.04; }
  .interactive-welcome,
  .interactive-game,
  .interactive-complete { border-radius: 16px; }
  .interactive-welcome { padding: 17px 14px; }
  .interactive-method-grid { grid-template-columns: 1fr; }
  .interactive-game { padding: 14px 12px; }
  .interactive-game-top { align-items: start; }
  .interactive-game-top h2 { font-size: 1.25rem; }
  .interactive-scenario-card { grid-template-columns: 1fr; gap: 10px; }
  .interactive-layout-heading { align-items: flex-start; flex-direction: column; gap: 3px; }
  .interactive-layout-heading strong { text-align: left; }
  .interactive-question-card { padding: 16px 13px; }
  .interactive-question-head { grid-template-columns: 1fr; gap: 9px; }
  .interactive-step-badge { justify-self: start; }
  .interactive-dimension-entry { grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); }
  .interactive-fraction-wrap { grid-column: 1 / -1; margin-top: 3px; }
  .interactive-mobile-keypad { display: block; margin-top: 10px; max-width: 420px; }
  .interactive-dimension-entry input[readonly],
  .interactive-number-entry input[readonly] { cursor: pointer; caret-color: transparent; }
  .interactive-choice-grid { grid-template-columns: 1fr; }
  .interactive-ceiling-svg .dim-text { font-size: 28px; }
  .interactive-ceiling-svg .svg-label { font-size: 23px; }
  .interactive-ceiling-svg .svg-small { font-size: 19px; }
  .interactive-ceiling-svg .border-text { font-size: 19px; }
  .interactive-ceiling-svg .tile-number { font-size: 20px; }
  .interactive-ceiling-svg .plan-center-label { font-size: 21px; }
  .interactive-complete { padding: 19px 14px; }
  .interactive-welcome-actions,
  .interactive-complete-actions { align-items: stretch; flex-direction: column; }
  .interactive-welcome-actions > *,
  .interactive-complete-actions > * { width: 100%; text-align: center; }
}

@media (max-width: 420px) {
  .interactive-game-top { gap: 10px; }
  .interactive-game-top .subtle-button { padding: 8px 9px; font-size: .76rem; }
  .interactive-progress { gap: 8px; }
  .interactive-fraction-options { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}