/* ==========================================================
   BELAJAREDUTECH
   BILANGAN & NILAI TEMPAT - MATEMATIKA KELAS 4
========================================================== */

.place-value-grade-four-page {
    --pv4-accent: #7c3aed;
    --pv4-accent-dark: #6d28d9;
    --pv4-accent-soft: #f5f3ff;
    --pv4-secondary: #2563eb;
    --pv4-green: #0f766e;
    --pv4-orange: #ea580c;
}



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

.place-value-four-hero {
    background:
        radial-gradient(
            circle at 86% 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
        );
}


.place-value-four-hero-card {
    min-height: 440px;

    display: flex;
    flex-direction: column;

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

    padding: 38px;

    color: #ffffff;

    background:
        linear-gradient(
            135deg,
            var(--pv4-accent),
            var(--pv4-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;
}


.place-value-four-hero-label {
    margin-bottom: 15px;

    color:
        rgba(255, 255, 255, 0.72);

    font-size: 0.68rem;

    font-weight: 850;

    text-transform: uppercase;

    letter-spacing: 0.08em;
}


.hero-main-number {
    margin-bottom: 20px;

    font-size:
        clamp(
            3rem,
            7vw,
            5rem
        );

    letter-spacing: -0.04em;
}


.hero-expanded-number {
    display: flex;

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

    flex-wrap: wrap;

    gap: 7px;

    margin-bottom: 22px;
}


.hero-expanded-number span {
    padding: 9px 11px;

    color:
        var(--pv4-accent-dark);

    background: #ffffff;

    border-radius: 9px;

    font-size: 0.68rem;

    font-weight: 900;
}


.hero-expanded-number i {
    color:
        rgba(255, 255, 255, 0.72);

    font-style: normal;

    font-weight: 900;
}


.hero-place-columns {
    width: 100%;

    display: grid;

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

    gap: 7px;
}


.hero-place-columns > div {
    padding: 12px 8px;

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

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

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


.hero-place-columns strong,
.hero-place-columns span {
    display: block;
}


.hero-place-columns strong {
    margin-bottom: 3px;

    font-size: 1.15rem;
}


.hero-place-columns span {
    color:
        rgba(255, 255, 255, 0.67);

    font-size: 0.54rem;
}



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

.place-value-intro-visual {
    min-height: 350px;

    display: grid;

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

    align-items: center;

    gap: 12px;

    padding: 32px;

    color: #ffffff;

    background:
        linear-gradient(
            135deg,
            var(--pv4-green),
            #0891b2
        );
}


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

    display: flex;
    flex-direction: column;

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

    padding: 20px;

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

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

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

    text-align: center;
}


.place-value-intro-visual strong {
    margin-bottom: 13px;

    font-size: 1.6rem;
}


.place-value-intro-visual span {
    margin-bottom: 4px;

    color:
        rgba(255, 255, 255, 0.68);

    font-size: 0.62rem;
}


.place-value-intro-visual b {
    font-size: 1.1rem;
}



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

.place-value-four-section {
    background:
        var(--color-background, #ffffff);
}


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

    margin-inline: auto;

    padding: 30px;

    background:
        var(--pv4-accent-soft);

    border:
        1px solid #ddd6fe;

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


.place-value-four-table-title {
    display: block;

    margin-bottom: 18px;

    color:
        var(--pv4-accent-dark);

    font-size: 0.72rem;

    font-weight: 900;

    text-align: center;

    text-transform: uppercase;
}


.place-value-four-table {
    display: grid;

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

    gap: 10px;
}


.place-value-four-column {
    min-height: 210px;

    display: flex;
    flex-direction: column;

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

    padding: 18px;

    background: #ffffff;

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

    text-align: center;
}


.place-value-four-column > span {
    margin-bottom: 9px;

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

    font-size: 0.6rem;

    font-weight: 850;

    text-transform: uppercase;
}


.place-value-four-column > strong {
    margin-bottom: 8px;

    color:
        var(--pv4-accent);

    font-size: 2.5rem;
}


.place-value-four-column > small {
    margin-bottom: 8px;

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


.place-value-four-column > b {
    color:
        var(--pv4-accent-dark);

    font-size: 1rem;
}



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

.digit-value-section,
.compose-number-section,
.ordering-four-section {
    background:
        var(--color-background-soft, #f8fafc);
}


.digit-value-wrapper,
.compose-number-wrapper,
.ordering-four-wrapper {
    display: grid;

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

    align-items: center;

    gap: 70px;
}


.digit-value-content h2,
.compose-number-content h2,
.ordering-four-content h2 {
    margin-bottom: 18px;

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

    letter-spacing: -0.04em;
}


.digit-value-content p,
.compose-number-content p,
.ordering-four-content p {
    color:
        var(--color-text-muted, #64748b);

    line-height: 1.8;
}



/* ==========================================================
   DIGIT VALUE
========================================================== */

.digit-value-card {
    padding: 28px;

    background: #ffffff;

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

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


.digit-value-card > span {
    display: block;

    margin-bottom: 7px;

    color:
        var(--pv4-accent);

    font-size: 0.62rem;

    font-weight: 850;

    text-transform: uppercase;
}


.digit-value-number {
    display: block;

    margin-bottom: 22px;

    color:
        var(--pv4-accent-dark);

    font-size: 2.6rem;
}


.digit-focus-row {
    display: grid;

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

    gap: 8px;
}


.digit-focus-row > div {
    padding: 16px;

    background:
        var(--pv4-accent-soft);

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

    text-align: center;
}


.digit-focus-row span,
.digit-focus-row strong {
    display: block;
}


.digit-focus-row span {
    margin-bottom: 5px;

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

    font-size: 0.59rem;
}


.digit-focus-row strong {
    color:
        var(--pv4-accent-dark);
}



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

.zero-place-section {
    background:
        var(--color-background, #ffffff);
}


.zero-place-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);

    text-align: center;
}


.zero-place-card > strong {
    display: block;

    margin-bottom: 22px;

    color:
        var(--pv4-accent);

    font-size: 2.6rem;
}


.zero-place-grid {
    display: grid;

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

    gap: 9px;

    margin-bottom: 18px;
}


.zero-place-grid > div {
    padding: 18px;

    background: #ffffff;

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


.zero-place-grid span,
.zero-place-grid b,
.zero-place-grid small {
    display: block;
}


.zero-place-grid span {
    margin-bottom: 7px;

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

    font-size: 0.58rem;
}


.zero-place-grid b {
    margin-bottom: 5px;

    color:
        var(--pv4-accent);

    font-size: 1.8rem;
}


.zero-place-grid small {
    color:
        var(--color-text-muted, #64748b);
}


.zero-place-highlight {
    outline:
        2px solid
        var(--pv4-orange);
}


.zero-place-card > p {
    margin: 0;

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



/* ==========================================================
   EXPANDED FORM
========================================================== */

.expanded-form-four-section {
    background:
        var(--color-background, #ffffff);
}


.expanded-form-four-card {
    max-width: 950px;

    margin-inline: auto;

    padding: 30px;

    background:
        var(--pv4-accent-soft);

    border:
        1px solid #ddd6fe;

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

    text-align: center;
}


.expanded-form-main {
    display: inline-block;

    padding: 15px 24px;

    color: #ffffff;

    background:
        var(--pv4-accent);

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

    font-size: 2rem;

    font-weight: 900;
}


.expanded-form-arrow {
    margin: 12px 0;

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


.expanded-form-parts {
    display: grid;

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

    align-items: center;

    gap: 8px;

    margin-bottom: 15px;
}


.expanded-form-parts > div {
    padding: 18px;

    background: #ffffff;

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


.expanded-form-parts > div span,
.expanded-form-parts > div strong {
    display: block;
}


.expanded-form-parts > div span {
    margin-bottom: 4px;

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

    font-size: 0.58rem;
}


.expanded-form-parts > div strong {
    color:
        var(--pv4-accent-dark);
}


.expanded-form-parts > span {
    color:
        var(--pv4-accent);

    font-weight: 900;
}


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

    color: #ffffff;

    background:
        var(--pv4-green);

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



/* ==========================================================
   COMPOSE
========================================================== */

.compose-number-card {
    padding: 28px;

    background: #ffffff;

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

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

    text-align: center;
}


.compose-number-parts {
    display: flex;

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

    flex-wrap: wrap;

    gap: 8px;
}


.compose-number-parts span {
    padding: 10px 12px;

    color:
        var(--pv4-accent-dark);

    background:
        var(--pv4-accent-soft);

    border-radius: 9px;

    font-weight: 850;
}


.compose-number-parts i {
    color:
        var(--color-text-muted, #64748b);

    font-style: normal;

    font-weight: 900;
}


.compose-number-arrow {
    margin: 15px 0;

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


.compose-number-card > strong {
    color:
        var(--pv4-accent);

    font-size: 2.4rem;
}



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

.compare-four-section {
    background:
        var(--color-background, #ffffff);
}


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

    display: grid;

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

    align-items: center;

    gap: 18px;

    margin:
        0 auto 15px;

    padding: 28px;

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

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

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


.compare-four-number {
    min-height: 145px;

    display: flex;
    flex-direction: column;

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

    padding: 18px;

    background: #ffffff;

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


.compare-four-number span,
.compare-four-number strong {
    display: block;
}


.compare-four-number span {
    margin-bottom: 6px;

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

    font-size: 0.6rem;
}


.compare-four-number strong {
    color:
        var(--pv4-accent);

    font-size: 2rem;
}


.compare-four-symbol {
    color:
        var(--pv4-accent);

    font-size: 2rem;

    font-weight: 900;
}


.compare-four-steps {
    max-width: 850px;

    display: grid;

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

    gap: 8px;

    margin-inline: auto;
}


.compare-four-steps > div {
    padding: 15px;

    background:
        var(--pv4-accent-soft);

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


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


.compare-four-steps span {
    margin-bottom: 4px;

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

    font-size: 0.58rem;
}


.compare-four-steps strong {
    margin-bottom: 5px;

    color:
        var(--pv4-accent-dark);
}


.compare-four-steps p {
    margin: 0;

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

    font-size: 0.68rem;
}



/* ==========================================================
   ORDERING
========================================================== */

.ordering-four-card {
    padding: 28px;

    background: #ffffff;

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

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

    text-align: center;
}


.ordering-four-card > span {
    display: block;

    margin-bottom: 14px;

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

    font-size: 0.62rem;
}


.ordering-original,
.ordering-result {
    display: flex;

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

    flex-wrap: wrap;

    gap: 10px;
}


.ordering-original strong,
.ordering-result strong {
    padding: 12px 15px;

    color:
        var(--pv4-accent-dark);

    background:
        var(--pv4-accent-soft);

    border-radius: 10px;
}


.ordering-four-arrow {
    margin: 15px 0;

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


.ordering-result span {
    color:
        var(--pv4-accent);

    font-weight: 900;
}



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

.place-value-four-interactive {
    color: #ffffff;

    background: #0f172a;
}


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


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


.place-value-four-lab {
    max-width: 1050px;

    margin-inline: auto;
}


.place-machine-panel,
.compare-machine-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);
}


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

    text-align: center;
}


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

    margin-bottom: 5px;

    color: #c4b5fd;

    font-size: 0.62rem;

    font-weight: 850;

    text-transform: uppercase;

    letter-spacing: 0.08em;
}


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

    color: #ffffff;
}


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

    color: #94a3b8;

    font-size: 0.75rem;
}



/* DIGIT CONTROLS */

.place-digit-controls {
    display: grid;

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

    gap: 10px;

    margin-bottom: 14px;
}


.place-digit-control {
    min-height: 230px;

    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);
}


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

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

    font-size: 0.6rem;

    font-weight: 850;

    text-transform: uppercase;
}


.place-digit-control > strong {
    color:
        var(--pv4-accent);

    font-size: 3rem;
}


.place-digit-control > small {
    min-height: 25px;

    margin-bottom: 12px;

    color:
        var(--pv4-accent-dark);

    font-weight: 850;
}


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

    gap: 7px;
}


.place-digit-control button {
    width: 44px;
    height: 44px;

    display: grid;

    place-items: center;

    color:
        var(--pv4-accent);

    background:
        var(--pv4-accent-soft);

    border:
        1px solid #ddd6fe;

    border-radius: 10px;

    font-size: 1.2rem;

    font-weight: 900;
}


.place-digit-control button:disabled {
    opacity: 0.35;

    cursor: not-allowed;
}



/* MACHINE OUTPUT */

.place-machine-number,
.place-machine-expanded {
    margin-bottom: 10px;

    padding: 20px;

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

    background: #ffffff;

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

    text-align: center;
}


.place-machine-number span,
.place-machine-number strong,
.place-machine-expanded span,
.place-machine-expanded strong {
    display: block;
}


.place-machine-number span,
.place-machine-expanded span {
    margin-bottom: 5px;

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

    font-size: 0.59rem;

    text-transform: uppercase;
}


.place-machine-number strong {
    color:
        var(--pv4-accent);

    font-size: 2.8rem;
}


.place-machine-expanded strong {
    color:
        var(--pv4-accent-dark);

    font-size: 1.2rem;
}


.place-machine-sentence {
    margin-bottom: 17px;

    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;
}


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


.place-four-reset-button {
    color: #ffffff;

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

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



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

.compare-machine-controls {
    display: grid;

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

    align-items: center;

    gap: 15px;

    margin-bottom: 14px;
}


.compare-machine-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);
}


.compare-machine-control > span {
    margin-bottom: 8px;

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

    font-size: 0.61rem;

    font-weight: 850;

    text-transform: uppercase;
}


.compare-machine-control > strong {
    margin-bottom: 15px;

    color:
        var(--pv4-accent);

    font-size: 2.4rem;
}


.compare-machine-control > div {
    display: flex;

    gap: 8px;
}


.compare-machine-control button {
    min-width: 70px;
    height: 42px;

    padding-inline: 10px;

    color:
        var(--pv4-accent-dark);

    background:
        var(--pv4-accent-soft);

    border:
        1px solid #ddd6fe;

    border-radius: 9px;

    font-weight: 850;
}


.compare-machine-control button:disabled {
    opacity: 0.35;

    cursor: not-allowed;
}


.compare-machine-symbol {
    color: #c4b5fd;

    font-size: 2rem;
}


.compare-machine-result {
    margin-bottom: 17px;

    padding: 22px;

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

    background: #ffffff;

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

    text-align: center;
}


.compare-machine-result span,
.compare-machine-result strong {
    display: block;
}


.compare-machine-result span {
    margin-bottom: 5px;

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

    font-size: 0.59rem;

    text-transform: uppercase;
}


.compare-machine-result strong {
    margin-bottom: 6px;

    color:
        var(--pv4-accent-dark);

    font-size: 1.1rem;
}


.compare-machine-result p {
    margin: 0;

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

    font-size: 0.72rem;
}



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

.place-four-practice-number,
.place-four-practice-compare {
    min-height: 125px;

    display: flex;

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

    margin-bottom: 22px;

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

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

    color:
        var(--pv4-accent-dark);

    font-size: 1.8rem;

    font-weight: 900;
}


.place-four-practice-number strong {
    color:
        var(--pv4-orange);
}


.place-four-practice-compare {
    gap: 14px;
}


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

    font-size: 0.65rem;

    font-weight: 600;
}



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

.place-value-grade-four-page
.quiz-options button.selected {
    border-color:
        var(--pv4-accent);

    background:
        var(--pv4-accent-soft);
}


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

    background: #dcfce7;

    border-color: #86efac;
}


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

    background: #fee2e2;

    border-color: #fca5a5;
}



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

@media (max-width: 1024px) {

    .digit-value-wrapper,
    .compose-number-wrapper,
    .ordering-four-wrapper {
        grid-template-columns: 1fr;

        gap: 45px;
    }


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

}



@media (max-width: 860px) {

    .expanded-form-parts {
        grid-template-columns: 1fr;
    }


    .expanded-form-parts > span {
        transform:
            rotate(90deg);

        text-align: center;
    }


    .compare-machine-controls {
        grid-template-columns: 1fr;
    }


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

        text-align: center;
    }

}



@media (max-width: 600px) {

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

        padding: 25px;
    }


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


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

        padding: 25px;
    }


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


    .digit-focus-row {
        grid-template-columns: 1fr;
    }


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


    .compare-four-card {
        grid-template-columns: 1fr;
    }


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

        text-align: center;
    }


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


    .place-machine-panel,
    .compare-machine-panel {
        padding: 18px;
    }


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


    .ordering-original,
    .ordering-result {
        flex-direction: column;
    }

}