/* ==========================================================
   BELAJAREDUTECH
   DESIMAL DASAR - MATEMATIKA KELAS 4
========================================================== */

.decimal-grade-four-page {
    --decimal4-accent: #7c3aed;
    --decimal4-accent-dark: #6d28d9;
    --decimal4-accent-soft: #f5f3ff;
    --decimal4-secondary: #2563eb;
    --decimal4-green: #0f766e;
    --decimal4-orange: #ea580c;
}



/* ==========================================================
   HERO
========================================================== */

.decimal-four-hero {
    background:
        radial-gradient(
            circle at 85% 18%,
            rgba(124, 58, 237, 0.13),
            transparent 31%
        ),
        radial-gradient(
            circle at 12% 88%,
            rgba(37, 99, 235, 0.08),
            transparent 28%
        ),
        linear-gradient(
            180deg,
            #fbf9ff,
            #ffffff
        );
}


.decimal-four-hero-card {
    min-height: 430px;

    display: flex;
    flex-direction: column;

    align-items: center;
    justify-content: center;

    padding: 38px;

    color: #ffffff;

    background:
        linear-gradient(
            135deg,
            var(--decimal4-accent),
            var(--decimal4-secondary)
        );

    border-radius:
        var(--radius-extra-large, 28px);

    box-shadow:
        var(
            --shadow-large,
            0 30px 80px rgba(15, 23, 42, 0.18)
        );

    text-align: center;
}


.decimal-four-hero-label {
    margin-bottom: 22px;

    color:
        rgba(255, 255, 255, 0.7);

    font-size: 0.68rem;

    font-weight: 850;

    text-transform: uppercase;

    letter-spacing: 0.08em;
}


.decimal-hero-equation {
    display: flex;

    align-items: center;
    justify-content: center;

    gap: 18px;

    margin-bottom: 23px;
}


.decimal-hero-fraction {
    min-width: 65px;

    display: grid;

    grid-template-rows:
        auto 3px auto;

    gap: 5px;
}


.decimal-hero-fraction span {
    font-size: 1.35rem;

    font-weight: 900;
}


.decimal-hero-fraction i {
    display: block;

    background: #ffffff;

    border-radius: 999px;
}


.decimal-hero-equation > strong {
    color:
        rgba(255, 255, 255, 0.75);

    font-size: 1.5rem;
}


.decimal-hero-number {
    padding: 12px 18px;

    color:
        var(--decimal4-accent-dark);

    background: #ffffff;

    border-radius:
        var(--radius-medium, 14px);

    font-size: 2rem;

    font-weight: 900;
}


.decimal-hero-tenths {
    width: 100%;

    display: grid;

    grid-template-columns:
        repeat(10, 1fr);

    gap: 4px;

    min-height: 58px;

    margin-bottom: 18px;
}


.decimal-hero-tenths i {
    display: block;

    background:
        rgba(255, 255, 255, 0.12);

    border:
        1px solid
        rgba(255, 255, 255, 0.16);

    border-radius: 5px;
}


.decimal-hero-tenths i.filled {
    background: #ffffff;
}


.decimal-hero-places {
    width: 100%;

    display: grid;

    grid-template-columns:
        1fr 0.6fr 1.4fr;

    gap: 7px;
}


.decimal-hero-places > div {
    padding: 11px 8px;

    background:
        rgba(255, 255, 255, 0.09);

    border:
        1px solid
        rgba(255, 255, 255, 0.13);

    border-radius:
        var(--radius-medium, 14px);
}


.decimal-hero-places strong,
.decimal-hero-places span {
    display: block;
}


.decimal-hero-places strong {
    margin-bottom: 3px;

    font-size: 1.2rem;
}


.decimal-hero-places span {
    color:
        rgba(255, 255, 255, 0.67);

    font-size: 0.53rem;
}



/* ==========================================================
   INTRO
========================================================== */

.decimal-intro-visual {
    min-height: 350px;

    display: grid;

    grid-template-columns:
        1fr auto 1fr;

    align-items: center;

    gap: 14px;

    padding: 32px;

    color: #ffffff;

    background:
        linear-gradient(
            135deg,
            var(--decimal4-green),
            #0891b2
        );
}


.decimal-intro-visual > div {
    min-height: 190px;

    display: flex;
    flex-direction: column;

    align-items: center;
    justify-content: center;

    padding: 20px;

    background:
        rgba(255, 255, 255, 0.08);

    border:
        1px solid
        rgba(255, 255, 255, 0.12);

    border-radius:
        var(--radius-medium, 14px);
}


.decimal-intro-visual > div > span {
    margin-bottom: 13px;

    color:
        rgba(255, 255, 255, 0.7);

    font-size: 0.61rem;

    text-transform: uppercase;
}


.decimal-intro-fraction {
    min-width: 70px;

    display: grid;

    grid-template-rows:
        auto 4px auto;

    gap: 5px;

    text-align: center;
}


.decimal-intro-fraction strong {
    font-size: 1.4rem;
}


.decimal-intro-fraction i {
    display: block;

    background: #ffffff;

    border-radius: 999px;
}


.decimal-intro-equal {
    font-size: 1.5rem;

    font-weight: 900;
}


.decimal-intro-number {
    font-size: 2.3rem;
}



/* ==========================================================
   FRACTION DISPLAY
========================================================== */

.decimal-fraction-display {
    min-width: 70px;

    display: grid;

    grid-template-rows:
        auto 4px auto;

    gap: 5px;

    text-align: center;
}


.decimal-fraction-display span {
    color:
        var(--decimal4-accent-dark);

    font-size: 1.35rem;

    font-weight: 900;
}


.decimal-fraction-display i {
    display: block;

    background:
        var(--decimal4-accent);

    border-radius: 999px;
}


.decimal-value-display {
    padding: 12px 18px;

    color: #ffffff;

    background:
        var(--decimal4-green);

    border-radius:
        var(--radius-medium, 14px);

    font-size: 1.7rem;

    font-weight: 900;
}



/* ==========================================================
   TENTHS
========================================================== */

.decimal-tenths-section {
    background:
        var(--color-background, #ffffff);
}


.decimal-tenths-card {
    max-width: 900px;

    margin-inline: auto;

    padding: 30px;

    background:
        var(--decimal4-accent-soft);

    border:
        1px solid #ddd6fe;

    border-radius:
        var(--radius-extra-large, 28px);
}


.decimal-tenths-equation,
.decimal-hundredths-equation {
    display: flex;

    align-items: center;
    justify-content: center;

    gap: 18px;

    margin-bottom: 22px;
}


.decimal-tenths-equation > strong,
.decimal-hundredths-equation > strong {
    color:
        var(--decimal4-accent);

    font-size: 1.4rem;
}


.decimal-ten-grid {
    display: grid;

    grid-template-columns:
        repeat(10, 1fr);

    gap: 4px;

    min-height: 85px;

    margin-bottom: 18px;
}


.decimal-ten-grid i {
    display: block;

    background: #ffffff;

    border:
        1px solid
        var(--color-border, #e2e8f0);

    border-radius: 5px;
}


.decimal-ten-grid i.filled {
    background:
        var(--decimal4-accent);
}


.decimal-tenths-examples {
    display: grid;

    grid-template-columns:
        repeat(4, 1fr);

    gap: 8px;
}


.decimal-tenths-examples > div {
    padding: 14px;

    background: #ffffff;

    border-radius:
        var(--radius-medium, 14px);

    text-align: center;
}


.decimal-tenths-examples span,
.decimal-tenths-examples strong {
    display: block;
}


.decimal-tenths-examples span {
    margin-bottom: 5px;

    color:
        var(--color-text-muted, #64748b);

    font-size: 0.6rem;
}


.decimal-tenths-examples strong {
    color:
        var(--decimal4-accent-dark);
}



/* ==========================================================
   TWO COLUMN
========================================================== */

.decimal-reading-section,
.decimal-zero-section {
    background:
        var(--color-background-soft, #f8fafc);
}


.decimal-two-column {
    display: grid;

    grid-template-columns:
        minmax(0, 0.75fr)
        minmax(500px, 1.25fr);

    align-items: center;

    gap: 70px;
}


.decimal-two-content h2 {
    margin-bottom: 18px;

    font-size:
        clamp(
            2.2rem,
            4vw,
            3.5rem
        );

    letter-spacing: -0.04em;
}


.decimal-two-content p {
    color:
        var(--color-text-muted, #64748b);

    line-height: 1.8;
}



/* ==========================================================
   READING
========================================================== */

.decimal-reading-card {
    padding: 28px;

    background: #ffffff;

    border:
        1px solid
        var(--color-border, #e2e8f0);

    border-radius:
        var(--radius-large, 20px);

    text-align: center;
}


.decimal-reading-number {
    display: block;

    margin-bottom: 20px;

    color:
        var(--decimal4-accent);

    font-size: 3rem;
}


.decimal-reading-parts {
    display: grid;

    grid-template-columns:
        1fr 0.6fr 1.5fr;

    gap: 8px;

    margin-bottom: 16px;
}


.decimal-reading-parts > div {
    padding: 16px;

    background:
        var(--decimal4-accent-soft);

    border-radius:
        var(--radius-medium, 14px);
}


.decimal-reading-parts span,
.decimal-reading-parts strong {
    display: block;
}


.decimal-reading-parts span {
    margin-bottom: 6px;

    color:
        var(--decimal4-accent);

    font-size: 1.6rem;

    font-weight: 900;
}


.decimal-reading-parts strong {
    color:
        var(--color-text-muted, #64748b);

    font-size: 0.61rem;
}


.decimal-reading-card > p {
    margin: 0;

    color:
        var(--color-text-muted, #64748b);
}



/* ==========================================================
   HUNDREDTHS
========================================================== */

.decimal-hundredths-section {
    background:
        var(--color-background, #ffffff);
}


.decimal-hundredths-card {
    max-width: 900px;

    margin-inline: auto;

    padding: 30px;

    background:
        var(--color-background-soft, #f8fafc);

    border:
        1px solid
        var(--color-border, #e2e8f0);

    border-radius:
        var(--radius-extra-large, 28px);
}


.hundred-grid-demo {
    max-width: 500px;

    margin-inline: auto;

    text-align: center;
}


.hundred-grid-cells {
    display: grid;

    grid-template-columns:
        repeat(10, 1fr);

    gap: 2px;

    aspect-ratio: 1 / 1;

    margin-bottom: 14px;

    padding: 5px;

    background: #ffffff;

    border:
        1px solid
        var(--color-border, #e2e8f0);

    border-radius:
        var(--radius-medium, 14px);
}


.hundred-grid-cells i {
    display: block;

    background:
        var(--decimal4-accent-soft);

    border-radius: 2px;
}


.hundred-grid-cells i.filled {
    background:
        var(--decimal4-accent);
}


.hundred-grid-demo p {
    margin: 0;

    color:
        var(--color-text-muted, #64748b);
}



/* ==========================================================
   PLACE VALUE
========================================================== */

.decimal-place-value-section {
    background:
        var(--color-background-soft, #f8fafc);
}


.decimal-place-table-card {
    max-width: 950px;

    margin-inline: auto;

    padding: 30px;

    background: #ffffff;

    border:
        1px solid
        var(--color-border, #e2e8f0);

    border-radius:
        var(--radius-extra-large, 28px);
}


.decimal-place-table-label {
    display: block;

    margin-bottom: 18px;

    color:
        var(--decimal4-accent);

    font-size: 0.7rem;

    font-weight: 900;

    text-align: center;

    text-transform: uppercase;
}


.decimal-place-table {
    display: grid;

    grid-template-columns:
        1fr 0.55fr 1.4fr 1.4fr;

    gap: 8px;

    margin-bottom: 16px;
}


.decimal-place-table > div {
    min-height: 200px;

    display: flex;
    flex-direction: column;

    align-items: center;
    justify-content: center;

    padding: 16px;

    background:
        var(--decimal4-accent-soft);

    border-radius:
        var(--radius-medium, 14px);

    text-align: center;
}


.decimal-place-table span,
.decimal-place-table strong,
.decimal-place-table small,
.decimal-place-table b {
    display: block;
}


.decimal-place-table span {
    margin-bottom: 8px;

    color:
        var(--color-text-muted, #64748b);

    font-size: 0.57rem;

    font-weight: 850;

    text-transform: uppercase;
}


.decimal-place-table strong {
    margin-bottom: 7px;

    color:
        var(--decimal4-accent);

    font-size: 2.4rem;
}


.decimal-place-table small {
    margin-bottom: 6px;

    color:
        var(--color-text-muted, #64748b);
}


.decimal-place-table b {
    color:
        var(--decimal4-accent-dark);
}


.decimal-place-comma {
    background:
        #ede9fe !important;
}


.decimal-expanded-form {
    padding: 15px;

    color: #ffffff;

    background:
        var(--decimal4-green);

    border-radius:
        var(--radius-medium, 14px);

    text-align: center;
}


.decimal-expanded-form span,
.decimal-expanded-form strong {
    display: block;
}


.decimal-expanded-form span {
    margin-bottom: 4px;

    color:
        rgba(255, 255, 255, 0.7);

    font-size: 0.57rem;
}



/* ==========================================================
   ZERO
========================================================== */

.decimal-zero-card {
    display: grid;

    grid-template-columns:
        repeat(3, 1fr);

    gap: 8px;

    padding: 28px;

    background: #ffffff;

    border:
        1px solid
        var(--color-border, #e2e8f0);

    border-radius:
        var(--radius-large, 20px);
}


.decimal-zero-card > strong {
    grid-column:
        1 / -1;

    margin-bottom: 8px;

    color:
        var(--decimal4-accent);

    font-size: 2.8rem;

    text-align: center;
}


.decimal-zero-card > div {
    padding: 15px;

    background:
        var(--decimal4-accent-soft);

    border-radius:
        var(--radius-medium, 14px);

    text-align: center;
}


.decimal-zero-card span,
.decimal-zero-card b {
    display: block;
}


.decimal-zero-card span {
    margin-bottom: 5px;

    color:
        var(--color-text-muted, #64748b);

    font-size: 0.58rem;
}


.decimal-zero-card b {
    color:
        var(--decimal4-accent-dark);

    font-size: 1.6rem;
}


.decimal-zero-highlight {
    outline:
        2px solid
        var(--decimal4-orange);
}


.decimal-zero-card p {
    grid-column:
        1 / -1;

    margin:
        8px 0 0;

    color:
        var(--color-text-muted, #64748b);

    text-align: center;
}



/* ==========================================================
   EQUIVALENCE
========================================================== */

.decimal-equivalence-section {
    background:
        var(--color-background, #ffffff);
}


.decimal-equivalence-card {
    max-width: 850px;

    display: grid;

    grid-template-columns:
        1fr auto 1fr;

    align-items: center;

    gap: 15px;

    margin-inline: auto;

    padding: 30px;

    background:
        var(--decimal4-accent-soft);

    border:
        1px solid #ddd6fe;

    border-radius:
        var(--radius-extra-large, 28px);
}


.decimal-equivalence-card > div:not(.decimal-equivalence-note) {
    padding: 22px;

    background: #ffffff;

    border-radius:
        var(--radius-large, 20px);

    text-align: center;
}


.decimal-equivalence-card > div strong,
.decimal-equivalence-card > div span {
    display: block;
}


.decimal-equivalence-card > div strong {
    margin-bottom: 5px;

    color:
        var(--decimal4-accent);

    font-size: 2rem;
}


.decimal-equivalence-card > div span {
    color:
        var(--color-text-muted, #64748b);
}


.decimal-equivalence-card > span {
    color:
        var(--decimal4-accent);

    font-size: 1.6rem;

    font-weight: 900;
}


.decimal-equivalence-note {
    grid-column:
        1 / -1;

    padding: 15px;

    color: #ffffff;

    background:
        var(--decimal4-green);

    border-radius:
        var(--radius-medium, 14px);

    text-align: center;
}


.decimal-equivalence-note strong {
    color: #ffffff !important;

    font-size: 1rem !important;
}


.decimal-equivalence-note p {
    margin:
        5px 0 0;

    color:
        rgba(255, 255, 255, 0.75);
}



/* ==========================================================
   COMPARE
========================================================== */

.decimal-compare-section {
    background:
        var(--color-background-soft, #f8fafc);
}


.decimal-compare-card {
    max-width: 850px;

    margin-inline: auto;

    padding: 30px;

    background: #ffffff;

    border:
        1px solid
        var(--color-border, #e2e8f0);

    border-radius:
        var(--radius-extra-large, 28px);
}


.decimal-compare-main {
    display: grid;

    grid-template-columns:
        1fr auto 1fr;

    align-items: center;

    gap: 15px;

    margin-bottom: 15px;
}


.decimal-compare-main > div {
    min-height: 140px;

    display: flex;
    flex-direction: column;

    align-items: center;
    justify-content: center;

    padding: 15px;

    background:
        var(--decimal4-accent-soft);

    border-radius:
        var(--radius-large, 20px);
}


.decimal-compare-main span,
.decimal-compare-main strong {
    display: block;
}


.decimal-compare-main > div span {
    margin-bottom: 5px;

    color:
        var(--color-text-muted, #64748b);

    font-size: 0.59rem;
}


.decimal-compare-main > div strong {
    color:
        var(--decimal4-accent);

    font-size: 2rem;
}


.decimal-compare-symbol {
    color:
        var(--decimal4-accent);

    font-size: 1.8rem;
}


.decimal-compare-steps {
    display: grid;

    grid-template-columns:
        repeat(3, 1fr);

    gap: 8px;
}


.decimal-compare-steps > div {
    padding: 14px;

    background:
        var(--color-background-soft, #f8fafc);

    border-radius:
        var(--radius-medium, 14px);

    text-align: center;
}


.decimal-compare-steps span,
.decimal-compare-steps strong {
    display: block;
}


.decimal-compare-steps span {
    margin-bottom: 5px;

    color:
        var(--color-text-muted, #64748b);

    font-size: 0.57rem;
}


.decimal-compare-steps strong {
    color:
        var(--decimal4-accent-dark);
}



/* ==========================================================
   NUMBER LINE
========================================================== */

.decimal-number-line-section {
    background:
        var(--color-background, #ffffff);
}


.decimal-number-line-card {
    max-width: 950px;

    margin-inline: auto;

    padding:
        45px 40px 30px;

    background:
        var(--decimal4-accent-soft);

    border:
        1px solid #ddd6fe;

    border-radius:
        var(--radius-extra-large, 28px);
}


.decimal-number-line {
    position: relative;

    height: 150px;

    margin-bottom: 15px;
}


.decimal-line-base {
    position: absolute;

    left: 0;
    right: 0;
    top: 50%;

    height: 5px;

    background:
        var(--decimal4-accent);

    border-radius: 999px;
}


.decimal-line-point {
    position: absolute;

    top: 50%;

    display: flex;
    flex-direction: column;

    align-items: center;

    transform:
        translate(-50%, -50%);
}


.decimal-line-point i {
    width: 18px;
    height: 18px;

    display: block;

    margin-bottom: 10px;

    background: #ffffff;

    border:
        5px solid
        var(--decimal4-accent);

    border-radius: 50%;
}


.decimal-line-point strong {
    color:
        var(--decimal4-accent-dark);

    font-size: 0.67rem;
}


.decimal-point-zero {
    left: 0;
}


.decimal-point-two {
    left: 20%;
}


.decimal-point-four {
    left: 40%;
}


.decimal-point-six {
    left: 60%;
}


.decimal-point-eight {
    left: 80%;
}


.decimal-point-one {
    left: 100%;
}


.decimal-number-line-card > p {
    margin: 0;

    color:
        var(--color-text-muted, #64748b);

    text-align: center;
}



/* ==========================================================
   INTERACTIVE
========================================================== */

.decimal-four-interactive {
    color: #ffffff;

    background: #0f172a;
}


.decimal-four-interactive
.section-eyebrow {
    color: #c4b5fd;
}


.decimal-four-interactive
.section-header p {
    color: #94a3b8;
}


.decimal-four-lab {
    max-width: 1050px;

    margin-inline: auto;
}


.decimal-place-lab-panel,
.fraction-decimal-lab-panel {
    margin-bottom: 18px;

    padding: 30px;

    background:
        rgba(255, 255, 255, 0.06);

    border:
        1px solid
        rgba(255, 255, 255, 0.1);

    border-radius:
        var(--radius-extra-large, 28px);
}


.decimal-four-lab-heading {
    margin-bottom: 24px;

    text-align: center;
}


.decimal-four-lab-heading > span {
    display: block;

    margin-bottom: 5px;

    color: #c4b5fd;

    font-size: 0.62rem;

    font-weight: 850;

    text-transform: uppercase;
}


.decimal-four-lab-heading h3 {
    margin-bottom: 7px;

    color: #ffffff;
}


.decimal-four-lab-heading p {
    margin: 0;

    color: #94a3b8;

    font-size: 0.74rem;
}



/* ==========================================================
   DIGIT CONTROLS
========================================================== */

.decimal-digit-controls {
    display: grid;

    grid-template-columns:
        repeat(3, 1fr);

    gap: 10px;

    margin-bottom: 14px;
}


.decimal-digit-control {
    min-height: 220px;

    display: flex;
    flex-direction: column;

    align-items: center;
    justify-content: center;

    padding: 20px;

    color:
        var(--color-text-secondary, #334155);

    background: #ffffff;

    border-radius:
        var(--radius-large, 20px);
}


.decimal-digit-control > span {
    margin-bottom: 8px;

    color:
        var(--color-text-muted, #64748b);

    font-size: 0.59rem;

    font-weight: 850;

    text-transform: uppercase;
}


.decimal-digit-control > strong {
    color:
        var(--decimal4-accent);

    font-size: 2.8rem;
}


.decimal-digit-control > small {
    min-height: 26px;

    margin-bottom: 12px;

    color:
        var(--decimal4-accent-dark);

    font-weight: 850;
}


.decimal-digit-control > div {
    display: flex;

    gap: 8px;
}


.decimal-digit-control button,
.fraction-decimal-control button {
    width: 44px;
    height: 44px;

    display: grid;

    place-items: center;

    color:
        var(--decimal4-accent-dark);

    background:
        var(--decimal4-accent-soft);

    border:
        1px solid #ddd6fe;

    border-radius: 9px;

    font-size: 1.1rem;

    font-weight: 900;
}


.decimal-digit-control button:disabled,
.fraction-decimal-control button:disabled {
    opacity: 0.35;

    cursor: not-allowed;
}



/* ==========================================================
   LIVE OUTPUT
========================================================== */

.decimal-live-number,
.decimal-live-expanded {
    margin-bottom: 10px;

    padding: 20px;

    color:
        var(--color-text-secondary, #334155);

    background: #ffffff;

    border-radius:
        var(--radius-large, 20px);

    text-align: center;
}


.decimal-live-number span,
.decimal-live-number strong,
.decimal-live-expanded span,
.decimal-live-expanded strong {
    display: block;
}


.decimal-live-number span,
.decimal-live-expanded span {
    margin-bottom: 5px;

    color:
        var(--color-text-muted, #64748b);

    font-size: 0.58rem;

    text-transform: uppercase;
}


.decimal-live-number strong {
    color:
        var(--decimal4-accent);

    font-size: 2.8rem;
}


.decimal-live-expanded strong {
    color:
        var(--decimal4-accent-dark);
}


.decimal-live-sentence,
.fraction-decimal-message {
    margin-bottom: 16px;

    padding: 14px;

    color: #ddd6fe;

    background:
        rgba(124, 58, 237, 0.1);

    border:
        1px solid
        rgba(196, 181, 253, 0.2);

    border-radius: 10px;

    text-align: center;

    font-size: 0.73rem;
}


.decimal-four-lab-actions {
    text-align: center;
}


.decimal-four-reset {
    color: #ffffff;

    background:
        rgba(255, 255, 255, 0.07);

    border:
        1px solid
        rgba(255, 255, 255, 0.14);
}



/* ==========================================================
   DENOMINATOR SELECTOR
========================================================== */

.decimal-denominator-selector {
    display: grid;

    grid-template-columns:
        repeat(2, 1fr);

    gap: 8px;

    margin-bottom: 15px;
}


.decimal-denominator-button {
    padding: 14px;

    color: #cbd5e1;

    background:
        rgba(255, 255, 255, 0.06);

    border:
        1px solid
        rgba(255, 255, 255, 0.1);

    border-radius:
        var(--radius-medium, 14px);

    font-weight: 750;
}


.decimal-denominator-button strong {
    display: block;

    margin-top: 3px;
}


.decimal-denominator-button.active {
    color: #ffffff;

    background:
        var(--decimal4-accent);

    border-color:
        var(--decimal4-accent);
}



/* ==========================================================
   FRACTION TO DECIMAL
========================================================== */

.fraction-decimal-controls {
    display: grid;

    grid-template-columns:
        1fr auto auto 1fr;

    align-items: center;

    gap: 14px;

    margin-bottom: 14px;
}


.fraction-decimal-control,
.fraction-decimal-result {
    min-height: 210px;

    display: flex;
    flex-direction: column;

    align-items: center;
    justify-content: center;

    padding: 20px;

    color:
        var(--color-text-secondary, #334155);

    background: #ffffff;

    border-radius:
        var(--radius-large, 20px);
}


.fraction-decimal-control > span,
.fraction-decimal-result > span {
    margin-bottom: 8px;

    color:
        var(--color-text-muted, #64748b);

    font-size: 0.59rem;

    font-weight: 850;

    text-transform: uppercase;
}


.fraction-decimal-control > strong,
.fraction-decimal-result > strong {
    margin-bottom: 14px;

    color:
        var(--decimal4-accent);

    font-size: 2.6rem;
}


.fraction-decimal-control > div {
    display: flex;

    gap: 8px;
}


.fraction-decimal-fraction {
    min-width: 90px;

    display: grid;

    grid-template-rows:
        auto 4px auto;

    gap: 6px;

    padding: 18px;

    color:
        var(--color-text-secondary, #334155);

    background: #ffffff;

    border-radius:
        var(--radius-large, 20px);

    text-align: center;
}


.fraction-decimal-fraction span {
    color:
        var(--decimal4-accent-dark);

    font-size: 1.5rem;

    font-weight: 900;
}


.fraction-decimal-fraction i {
    display: block;

    background:
        var(--decimal4-accent);

    border-radius: 999px;
}


.fraction-decimal-equal {
    color: #c4b5fd;

    font-size: 1.8rem;

    font-weight: 900;
}


.fraction-decimal-result > strong {
    margin-bottom: 0;
}



/* ==========================================================
   DYNAMIC FRACTION GRID
========================================================== */

.fraction-decimal-visual {
    margin-bottom: 12px;

    padding: 20px;

    color:
        var(--color-text-secondary, #334155);

    background: #ffffff;

    border-radius:
        var(--radius-large, 20px);
}


.fraction-decimal-visual > span {
    display: block;

    margin-bottom: 12px;

    color:
        var(--decimal4-accent-dark);

    font-size: 0.68rem;

    font-weight: 850;

    text-align: center;
}


.fraction-decimal-grid {
    display: grid;

    gap: 3px;
}


.fraction-decimal-segment {
    min-height: 35px;

    display: block;

    background:
        var(--color-background-soft, #f8fafc);

    border:
        1px solid
        var(--color-border, #e2e8f0);

    border-radius: 4px;
}


.fraction-decimal-segment.filled {
    background:
        var(--decimal4-accent);
}



/* ==========================================================
   PRACTICE
========================================================== */

.decimal-practice-equation,
.decimal-practice-compare {
    min-height: 125px;

    display: flex;

    align-items: center;
    justify-content: center;

    margin-bottom: 22px;

    color:
        var(--decimal4-accent-dark);

    background:
        var(--color-background-soft, #f8fafc);

    border-radius:
        var(--radius-medium, 14px);

    font-size: 1.7rem;

    font-weight: 900;

    text-align: center;
}


.decimal-practice-equation strong {
    color:
        var(--decimal4-orange);
}


.decimal-practice-compare {
    gap: 14px;
}


.decimal-practice-compare span {
    color:
        var(--color-text-muted, #64748b);

    font-size: 0.64rem;

    font-weight: 600;
}



/* ==========================================================
   QUIZ STATES
========================================================== */

.decimal-grade-four-page
.quiz-options button.selected {
    border-color:
        var(--decimal4-accent);

    background:
        var(--decimal4-accent-soft);
}


.decimal-grade-four-page
.quiz-options button.correct {
    color: #166534;

    background: #dcfce7;

    border-color: #86efac;
}


.decimal-grade-four-page
.quiz-options button.incorrect {
    color: #991b1b;

    background: #fee2e2;

    border-color: #fca5a5;
}



/* ==========================================================
   RESPONSIVE
========================================================== */

@media (max-width: 1024px) {

    .decimal-two-column {
        grid-template-columns: 1fr;

        gap: 45px;
    }


    .decimal-digit-controls {
        grid-template-columns:
            repeat(2, 1fr);
    }

}



@media (max-width: 860px) {

    .decimal-tenths-examples {
        grid-template-columns:
            repeat(2, 1fr);
    }


    .decimal-place-table {
        grid-template-columns:
            repeat(2, 1fr);
    }


    .fraction-decimal-controls {
        grid-template-columns: 1fr;
    }


    .fraction-decimal-equal {
        transform:
            rotate(90deg);

        text-align: center;
    }

}



@media (max-width: 600px) {

    .decimal-four-hero-card {
        min-height: 390px;

        padding: 25px;
    }


    .decimal-hero-places {
        grid-template-columns: 1fr;
    }


    .decimal-intro-visual {
        grid-template-columns: 1fr;

        padding: 25px;
    }


    .decimal-intro-equal {
        transform:
            rotate(90deg);

        text-align: center;
    }


    .decimal-ten-grid {
        min-height: 65px;
    }


    .decimal-tenths-examples {
        grid-template-columns: 1fr;
    }


    .decimal-reading-parts {
        grid-template-columns: 1fr;
    }


    .decimal-place-table {
        grid-template-columns: 1fr;
    }


    .decimal-zero-card {
        grid-template-columns: 1fr;
    }


    .decimal-zero-card > strong,
    .decimal-zero-card p {
        grid-column: auto;
    }


    .decimal-equivalence-card {
        grid-template-columns: 1fr;
    }


    .decimal-equivalence-card > span {
        transform:
            rotate(90deg);

        text-align: center;
    }


    .decimal-equivalence-note {
        grid-column: auto;
    }


    .decimal-compare-main {
        grid-template-columns: 1fr;
    }


    .decimal-compare-symbol {
        transform:
            rotate(90deg);

        text-align: center;
    }


    .decimal-compare-steps {
        grid-template-columns: 1fr;
    }


    .decimal-number-line-card {
        padding:
            45px 18px 25px;
    }


    .decimal-line-point strong {
        font-size: 0.52rem;
    }


    .decimal-place-lab-panel,
    .fraction-decimal-lab-panel {
        padding: 18px;
    }


    .decimal-digit-controls {
        grid-template-columns: 1fr;
    }


    .decimal-denominator-selector {
        grid-template-columns: 1fr;
    }

}