/* ================================================================
common-factors-multiples.css
----------------------------------------------------------------
Styles for the "Common Factors & Common Multiples" skill group
(Tier 2b) on the Class 5 Math page, placed right after "Finding
Factors and Multiples Systematically":
- A.1 Overlap Circles — Common Factors — two Venn circles
(factors of A / factors of B) with number pills already
sorted into left-only, right-only and the overlap; the
child picks which of 4 numbers belongs in the overlap
(new .cfm-venn-* classes).
- A.2 Overlap Circles — Common Multiples — two parallel
number lines, multiples of one number highlighted on
each, so the child can see which numbers land on both
lines (new .cfm-lines-* classes).
- A.3 Which Numbers Fit Both? (Puzzle Mode) — a real-world
sharing puzzle ("arrange both A apples and B oranges
into equal rows of the same size") illustrated with two
rows of fruit dots (new .cfm-puzzle-* classes).
- A.4 Meeting Point on the Number Line — two frogs hopping in
steps of p and q along a shared number line; the child
finds the first spot where both frogs land (new
.cfm-frog-* classes, built on the same .cfm-lines-*
two-track layout as A.2).
Every skill here shares the same 5-question-per-slot / star-
reward / "practice more?" quiz shell as the rest of the site (via
the .bq- / .quiz- classes from quiz-popup-theme.css and quiz-
modal-responsive.css, loaded elsewhere). This file defines its
own self-contained "cfm-" prefixed classes, including its own
answer-chip wrapper (.cfm-picker), so it has no hidden cross-file
dependency — same philosophy as factor-multiple-systematic.css's
.ffm- classes. Load this file after the shared quiz shell
stylesheets, e.g.:
================================================================ */
/* ---------- shared: answer-chip picker row ---------- */
/* flex-wrap is intentionally "nowrap": there are always exactly 4
chips and they must always sit in a single row on every screen
size, including small Android phone browsers. Each .cfm-opt is a
flexible (not fixed-width) item so the row shrinks to fit the
quiz card instead of wrapping to a second line. */
.cfm-picker {
display: flex;
align-items: stretch;
justify-content: center;
flex-wrap: nowrap;
gap: 10px;
margin: 18px auto 4px;
width: 100%;
max-width: 420px;
}
.cfm-opt {
display: inline-flex;
align-items: center;
justify-content: center;
flex: 1 1 0;
min-width: 0;
max-width: 170px;
padding: 12px 6px;
height: auto !important;
min-height: 52px !important;
max-height: none !important;
box-sizing: border-box !important;
white-space: normal !important;
overflow: visible;
font-weight: 800;
font-size: 16px;
color: var(--secondary);
text-align: center;
line-height: 1.2;
word-break: break-word;
}
.quiz-number-opt.cfm-opt.is-correct {
border-color: #10b981;
background: rgba(16,185,129,0.08);
box-shadow: 0 0 0 3px rgba(16,185,129,0.18);
}
.quiz-number-opt.cfm-opt.is-wrong {
border-color: #ef4444;
background: rgba(239,68,68,0.08);
box-shadow: 0 0 0 3px rgba(239,68,68,0.18);
}
/* ---------- shared: target / instruction caption ---------- */
.cfm-target-caption {
font-weight: 700;
font-size: 15px;
color: var(--text);
text-align: center;
margin: 4px auto 2px;
max-width: 360px;
}
.cfm-target-caption .cfm-target-val {
font-weight: 800;
color: var(--secondary);
font-size: 17px;
}
/* ================================================================
A.1 Overlap Circles — Common Factors
================================================================ */
.cfm-venn-wrap {
display: flex;
flex-direction: column;
align-items: center;
gap: 6px;
margin: 14px auto 6px;
width: 100%;
}
.cfm-venn-stage {
position: relative;
width: min(330px, 92%);
height: 208px;
margin: 4px auto 0;
}
.cfm-venn-circle {
position: absolute;
top: 14px;
width: 190px;
height: 180px;
border-radius: 50%;
border: 3px solid var(--purple);
background: rgba(157, 92, 255, 0.10);
}
.cfm-venn-circle.right {
border-color: var(--sky);
background: rgba(46, 155, 245, 0.10);
}
.cfm-venn-label {
position: absolute;
top: -4px;
font-weight: 800;
font-size: 12.5px;
text-align: center;
width: 130px;
}
.cfm-venn-label.left { left: 4px; color: var(--purple); }
.cfm-venn-label.right { right: 4px; color: var(--sky); text-align: right; }
.cfm-venn-pill {
position: absolute;
transform: translate(-50%, -50%);
display: flex;
align-items: center;
justify-content: center;
min-width: 28px;
height: 26px;
padding: 0 6px;
border-radius: 13px;
background: #fff;
border: 2px solid var(--secondary);
font-weight: 800;
font-size: 13px;
color: var(--secondary);
box-shadow: 0 2px 5px rgba(0,0,0,0.10);
}
.cfm-venn-pill.is-overlap {
border-color: var(--sun);
color: #b8860b;
background: #fff8e8;
}
.cfm-venn-note {
font-weight: 700;
font-size: 12.5px;
color: var(--text);
opacity: 0.75;
text-align: center;
max-width: 300px;
}
.cfm-venn-note .cfm-overlap-word { color: var(--sun); font-weight: 800; }
/* ================================================================
A.2 Overlap Circles — Common Multiples (parallel number lines)
A.4 Meeting Point on the Number Line (two frogs) reuses this
two-track layout with its own row accent classes.
================================================================ */
.cfm-lines-wrap {
display: flex;
flex-direction: column;
align-items: center;
gap: 14px;
margin: 16px auto 8px;
width: 100%;
}
.cfm-lines-row {
display: flex;
flex-direction: column;
align-items: center;
gap: 2px;
width: 100%;
}
.cfm-lines-row-label {
font-weight: 800;
font-size: 13px;
color: var(--purple);
text-align: center;
}
.cfm-lines-row.is-second .cfm-lines-row-label { color: var(--sky); }
.cfm-lines-row-label .cfm-lines-emoji { font-size: 15px; margin-right: 3px; }
.cfm-line-track-wrap {
position: relative;
width: min(430px, 94%);
height: 40px;
}
.cfm-line-base {
position: absolute;
left: 0; right: 0; top: 18px;
height: 4px;
border-radius: 2px;
background: var(--secondary);
opacity: 0.20;
}
.cfm-line-tick {
position: absolute;
top: 10px;
width: 2px;
height: 20px;
background: var(--secondary);
opacity: 0.22;
transform: translateX(-1px);
}
.cfm-line-num {
position: absolute;
top: 30px;
transform: translateX(-50%);
font-weight: 700;
font-size: 9.5px;
color: var(--secondary);
opacity: 0.55;
}
.cfm-line-dot {
position: absolute;
top: 12px;
width: 16px;
height: 16px;
border-radius: 50%;
transform: translate(-50%, 0);
background: var(--purple);
border: 2px solid #fff;
box-shadow: 0 1px 4px rgba(0,0,0,0.18);
}
.cfm-lines-row.is-second .cfm-line-dot { background: var(--sky); }
.cfm-line-dot.is-common {
background: var(--sun);
width: 20px;
height: 20px;
box-shadow: 0 0 0 3px rgba(255,193,7,0.25);
}
.cfm-line-dot-label {
position: absolute;
top: -17px;
left: 50%;
transform: translateX(-50%);
font-weight: 800;
font-size: 10px;
color: inherit;
}
/* ================================================================
A.3 Which Numbers Fit Both? (Puzzle Mode)
================================================================ */
.cfm-puzzle-wrap {
display: flex;
flex-direction: column;
align-items: center;
gap: 10px;
margin: 14px auto 6px;
width: 100%;
}
.cfm-puzzle-story {
font-weight: 700;
font-size: 14px;
color: var(--text);
text-align: center;
max-width: 320px;
line-height: 1.4;
}
.cfm-puzzle-groups {
display: flex;
justify-content: center;
gap: 22px;
flex-wrap: nowrap;
width: 100%;
}
.cfm-puzzle-group {
display: flex;
flex-direction: column;
align-items: center;
gap: 4px;
}
.cfm-puzzle-group-label {
font-weight: 800;
font-size: 13px;
color: var(--secondary);
}
.cfm-puzzle-dots {
display: grid;
grid-auto-flow: row;
gap: 3px;
max-width: 130px;
justify-content: center;
}
.cfm-puzzle-dot {
width: 16px;
height: 16px;
display: flex;
align-items: center;
justify-content: center;
font-size: 13px;
}
.cfm-puzzle-question {
font-weight: 800;
font-size: 14.5px;
color: var(--purple);
text-align: center;
max-width: 320px;
margin-top: 2px;
}
/* ---------- phone responsiveness ---------- */
@media (max-width: 560px) {
.cfm-picker { gap: 7px; margin: 14px auto 4px; max-width: 350px; }
.cfm-opt { padding: 9px 5px; font-size: 14px; min-height: 46px !important; }
.cfm-venn-stage { height: 190px; }
.cfm-venn-circle { width: 168px; height: 160px; top: 14px; }
.cfm-venn-pill { min-width: 24px; height: 22px; font-size: 11.5px; }
.cfm-venn-label { font-size: 11px; width: 110px; }
.cfm-lines-wrap { gap: 10px; }
.cfm-line-track-wrap { height: 36px; }
.cfm-line-num { font-size: 8.5px; top: 27px; }
.cfm-line-dot { width: 13px; height: 13px; top: 12.5px; }
.cfm-line-dot.is-common { width: 17px; height: 17px; }
.cfm-puzzle-groups { gap: 14px; }
.cfm-puzzle-dots { max-width: 104px; }
.cfm-puzzle-dot { width: 13px; height: 13px; font-size: 11px; }
.cfm-puzzle-story, .cfm-puzzle-question { max-width: 280px; font-size: 13px; }
}
@media (max-width: 380px) {
.cfm-picker { gap: 5px; max-width: 310px; }
.cfm-opt { padding: 7px 4px; font-size: 12.5px; min-height: 44px !important; }
.cfm-venn-stage { height: 172px; }
.cfm-venn-circle { width: 148px; height: 142px; top: 12px; }
.cfm-venn-pill { min-width: 22px; height: 20px; font-size: 10.5px; }
.cfm-venn-label { font-size: 10px; width: 96px; }
.cfm-line-track-wrap { width: 96%; }
.cfm-line-dot { width: 11px; height: 11px; }
.cfm-line-dot.is-common { width: 15px; height: 15px; }
.cfm-puzzle-groups { gap: 10px; }
.cfm-puzzle-dots { max-width: 88px; }
.cfm-puzzle-dot { width: 11px; height: 11px; font-size: 10px; }
}