/* =========================================================
   Prime Factorization Practice
   File:
   /interactive-learning-tools/prime-factorization/
   prime-factorization.css
   ========================================================= */

.prime-factorization-page {
    font-family: "Inter", sans-serif;
    background: #ffffff;
    color: #1f2937;
}

.prime-factorization-page *,
.prime-factorization-page *::before,
.prime-factorization-page *::after {
    box-sizing: border-box;
}


/* =========================================================
   Shared section styles
   ========================================================= */

.prime-factorization-overview,
.prime-factorization-tool-section,
.prime-factorization-reminders,
.prime-factorization-uses,
.prime-factorization-final-cta {
    padding: 5rem 0;
}

.prime-factorization-overview,
.prime-factorization-reminders {
    background: #f7f9fc;
}

.prime-factorization-tool-section,
.prime-factorization-uses,
.prime-factorization-final-cta {
    background: #ffffff;
}

.prime-factorization-section-heading {
    max-width: 760px;
    margin: 0 auto 2.25rem;
    text-align: center;
}

.prime-factorization-section-heading h2 {
    margin-bottom: 1rem;
    color: #101827;
    font-size: clamp(1.75rem, 3vw, 2.4rem);
    font-weight: 800;
}

.prime-factorization-section-heading > p:last-child {
    margin-bottom: 0;
    color: #5b6678;
    font-size: 1.05rem;
    line-height: 1.75;
}

.prime-factorization-eyebrow {
    margin-bottom: 0.65rem;
    color: #0f766e;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}


/* =========================================================
   Overview cards
   ========================================================= */

.prime-factorization-overview-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
}

.prime-factorization-overview-card {
    min-height: 100%;
    border: 1px solid #dce3eb;
    border-radius: 1rem;
    background: #ffffff;
    padding: 1.5rem;
    box-shadow: 0 12px 30px rgba(16, 24, 39, 0.05);
}

.prime-factorization-overview-card h3 {
    margin-bottom: 0.75rem;
    color: #101827;
    font-size: 1.1rem;
    font-weight: 800;
}

.prime-factorization-overview-card p {
    margin-bottom: 0;
    color: #5b6678;
    line-height: 1.65;
}

.prime-factorization-step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.65rem;
    height: 2.65rem;
    margin-bottom: 1rem;
    border-radius: 50%;
    background: #0f766e;
    color: #ffffff;
    font-weight: 800;
}


/* =========================================================
   Main tool shell
   ========================================================= */

.prime-factorization-tool {
    max-width: 1100px;
    margin: 0 auto;
    overflow: hidden;
    border: 1px solid #dce3eb;
    border-radius: 1.25rem;
    background: #ffffff;
    box-shadow: 0 22px 55px rgba(16, 24, 39, 0.1);
}

.prime-factorization-tool-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    border-bottom: 1px solid #dce3eb;
    background: #101827;
    color: #ffffff;
    padding: 1.75rem 2rem;
}

.prime-factorization-tool-header h2 {
    margin-bottom: 0;
    color: #ffffff;
    font-size: clamp(1.45rem, 3vw, 2rem);
    font-weight: 800;
}

.prime-factorization-tool-header
.prime-factorization-eyebrow {
    color: #5eead4;
}


/* =========================================================
   Scoreboard
   ========================================================= */

.prime-factorization-scoreboard {
    display: grid;
    grid-template-columns: repeat(3, minmax(80px, 1fr));
    gap: 0.75rem;
}

.prime-factorization-score-item {
    min-width: 90px;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 0.8rem;
    background: rgba(255, 255, 255, 0.08);
    padding: 0.75rem 0.9rem;
    text-align: center;
}

.prime-factorization-score-label {
    display: block;
    margin-bottom: 0.2rem;
    color: rgba(255, 255, 255, 0.72);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.prime-factorization-score-item strong {
    color: #ffffff;
    font-size: 1.4rem;
    font-weight: 800;
}


/* =========================================================
   Settings
   ========================================================= */

.prime-factorization-settings {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr)) auto;
    gap: 1rem;
    align-items: end;
    border-bottom: 1px solid #dce3eb;
    background: #f7f9fc;
    padding: 1.5rem 2rem;
}

.prime-factorization-setting-group label {
    display: block;
    margin-bottom: 0.45rem;
    color: #273449;
    font-size: 0.9rem;
    font-weight: 700;
}

.prime-factorization-setting-group .form-select {
    min-height: 3rem;
    border-color: #cfd8e3;
    border-radius: 0.75rem;
}

.prime-factorization-setting-group .form-select:focus {
    border-color: #0f766e;
    box-shadow: 0 0 0 0.2rem rgba(15, 118, 110, 0.14);
}

#newProblemButton {
    min-height: 3rem;
    white-space: nowrap;
}


/* =========================================================
   Buttons
   ========================================================= */

.prime-factorization-page .btn-teal {
    border-color: #0f766e;
    background: #0f766e;
    color: #ffffff;
}

.prime-factorization-page .btn-teal:hover,
.prime-factorization-page .btn-teal:focus {
    border-color: #0b5f59;
    background: #0b5f59;
    color: #ffffff;
}

.prime-factorization-page .btn-outline-teal {
    border-color: #0f766e;
    color: #0f766e;
}

.prime-factorization-page .btn-outline-teal:hover,
.prime-factorization-page .btn-outline-teal:focus {
    border-color: #0f766e;
    background: #0f766e;
    color: #ffffff;
}


/* =========================================================
   Problem display
   ========================================================= */

.prime-factorization-problem-area {
    border-bottom: 1px solid #dce3eb;
    padding: 2.25rem 2rem;
    text-align: center;
}

.prime-factorization-problem-label {
    margin-bottom: 0.75rem;
    color: #657184;
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.prime-factorization-target-number {
    margin-bottom: 0.85rem;
    color: #101827;
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1;
}

.prime-factorization-problem-instruction {
    max-width: 720px;
    margin: 0 auto;
    color: #5b6678;
    line-height: 1.7;
}

/* =========================================================
   Progress tracker
   ========================================================= */

.prime-factorization-progress {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    border-bottom: 1px solid #dce3eb;
    background: #ffffff;
    padding: 1.75rem 2rem;
}

.prime-factorization-progress-step {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 90px;
    color: #8a95a6;
    text-align: center;
}

.prime-factorization-progress-circle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border: 2px solid #cfd8e3;
    border-radius: 50%;
    background: #ffffff;
    color: #7a8698;
    font-weight: 800;
    transition:
        border-color 0.2s ease,
        background 0.2s ease,
        color 0.2s ease;
}

.prime-factorization-progress-step p {
    margin: 0.55rem 0 0;
    font-size: 0.8rem;
    font-weight: 700;
}

.prime-factorization-progress-step.active {
    color: #0f766e;
}

.prime-factorization-progress-step.active
.prime-factorization-progress-circle {
    border-color: #0f766e;
    background: #0f766e;
    color: #ffffff;
}

.prime-factorization-progress-step.complete {
    color: #0f766e;
}

.prime-factorization-progress-step.complete
.prime-factorization-progress-circle {
    border-color: #0f766e;
    background: #dff7f3;
    color: #0f766e;
}

.prime-factorization-progress-line {
    width: 110px;
    height: 2px;
    margin-top: 1.2rem;
    background: #d8e0e9;
}

.prime-factorization-progress-line.complete {
    background: #0f766e;
}


/* =========================================================
   Workspace
   ========================================================= */

.prime-factorization-workspace {
    padding: 2rem;
}

.prime-factorization-work-step {
    max-width: 900px;
    margin: 0 auto;
    border: 1px solid #dce3eb;
    border-radius: 1rem;
    background: #ffffff;
    padding: 2rem;
    box-shadow: 0 12px 30px rgba(16,24,39,0.06);
}

.prime-factorization-work-step + .prime-factorization-work-step {
    margin-top: 1.25rem;
}

.prime-factorization-work-step.active {
    border-color: #7dd3c7;
    box-shadow:
        0 0 0 3px rgba(15,118,110,0.08),
        0 14px 32px rgba(16,24,39,0.08);
}

.prime-factorization-work-step.complete {
    border-color: #86cda9;
    background: #f7fdf9;
}

.prime-factorization-work-step[hidden] {
    display: none;
}

.prime-factorization-work-label {
    margin-bottom: 0.5rem;
    color: #0f766e;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.prime-factorization-work-step h3 {
    margin-bottom: 0.75rem;
    color: #101827;
    font-size: clamp(1.35rem,3vw,1.8rem);
    font-weight: 800;
}

.prime-factorization-step-instruction {
    max-width: 720px;
    margin-bottom: 1.5rem;
    color: #5b6678;
    line-height: 1.7;
}


/* =========================================================
   Factor tree
   ========================================================= */

.prime-factorization-tree-panel {
    margin-bottom: 2rem;
    overflow-x: auto;
    border: 1px solid #dce3eb;
    border-radius: 1rem;
    background: #f8fafc;
    padding: 2rem;
}

.prime-factorization-tree {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    min-width: max-content;
    min-height: 320px;
    padding: 1rem 2rem 2rem;
}

.prime-factorization-tree ul {
    position: relative;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 2rem;
    margin: 0;
    padding: 3.75rem 0 0;
}

.prime-factorization-tree > ul {
    padding-top: 0;
}

.prime-factorization-tree li {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 90px;
    margin: 0;
    padding: 0;
    list-style: none;
    text-align: center;
}

.prime-factorization-tree li > ul {
    gap: 3rem;
    padding-top: 4.5rem;
}

/*
 * Each child draws one diagonal connector back toward
 * the center of its parent node.
 */
.prime-factorization-tree li > ul > li::before {
    content: "";
    position: absolute;
    z-index: 0;
    bottom: 100%;
    left: 50%;
    display: block;
    width: 2px;
    height: 6rem;
    background: #b9c5d2;
    transform-origin: bottom center;
}

.prime-factorization-tree li > ul > li:first-child::before {
    transform:
        translateX(-1px)
        rotate(44deg);
}

.prime-factorization-tree li > ul > li:last-child::before {
    transform:
        translateX(-1px)
        rotate(-44deg);
}

/*
 * The current tree always creates two children. This keeps
 * any unused legacy pseudo-elements from drawing extra lines.
 */
.prime-factorization-tree li::after,
.prime-factorization-tree ul::before,
.prime-factorization-tree ul::after {
    content: none;
}

/* =========================================================
   Tree nodes
   ========================================================= */

.prime-factorization-node {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    border: 3px solid #cfd8e3;
    border-radius: 50%;
    background: #ffffff;
    color: #101827;
    cursor: pointer;
    font-size: 1.35rem;
    font-weight: 800;
    transition: all .2s ease;
}

.prime-factorization-node:hover {
    border-color: #0f766e;
    background: #ecfdf8;
}

.prime-factorization-node.active {
    border-color: #0f766e;
    background: #0f766e;
    color: #ffffff;
}

.prime-factorization-node.prime {
    border-color: #15803d;
    background: #f0fdf4;
    color: #166534;
}

.prime-factorization-node.composite {
    border-color: #2563eb;
    background: #eff6ff;
    color: #1d4ed8;
}


/* =========================================================
   Branch input panel
   ========================================================= */

.prime-factorization-branch-panel {
    border: 1px solid #dce3eb;
    border-radius: 1rem;
    background: #f8fafc;
    padding: 1.75rem;
    text-align: center;
}

.prime-factorization-branch-label {
    margin-bottom: .5rem;
    color: #5b6678;
    font-size: .8rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: .08em;
}

.prime-factorization-active-number {
    margin-bottom: 1.25rem;
    color: #101827;
    font-size: 2.75rem;
    font-weight: 800;
}

.prime-factorization-factor-pair {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.prime-factorization-multiply-symbol {
    color: #64748b;
    font-size: 1.8rem;
    font-weight: 800;
}

.prime-factorization-number-input {
    width: 100px;
    height: 60px;
    border: 2px solid #cfd8e3;
    border-radius: .75rem;
    background: #ffffff;
    color: #101827;
    font-size: 1.4rem;
    font-weight: 800;
    text-align: center;
}

.prime-factorization-number-input:focus {
    border-color: #0f766e;
    outline: none;
    box-shadow: 0 0 0 .22rem rgba(15,118,110,.14);
}

.prime-factorization-tree-complete {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    border: 1px solid #86cda9;
    border-radius: .8rem;
    background: #f0fdf4;
    padding: 1rem;
    color: #166534;
    text-align: center;
}

#continueToPrimesButton {
    display: block;
    margin: 0 auto;
}

/* =========================================================
   Step 2 / Step 3
   ========================================================= */

.prime-factorization-field-label {
    display: block;
    margin-bottom: .65rem;
    color: #273449;
    font-weight: 700;
}

.prime-factorization-text-input {
    max-width: 640px;
    margin: 0 auto;
    min-height: 58px;
    border: 2px solid #cfd8e3;
    border-radius: .8rem;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 700;
}

.prime-factorization-text-input:focus {
    border-color: #0f766e;
    box-shadow: 0 0 0 .2rem rgba(15,118,110,.14);
}

.prime-factorization-input-help {
    max-width: 640px;
    margin: .75rem auto 1.5rem;
    color: #64748b;
    text-align: center;
    line-height: 1.65;
}

.prime-factorization-reference,
.prime-factorization-prime-summary {
    margin-bottom: 1.5rem;
    border: 1px solid #dce3eb;
    border-radius: .9rem;
    background: #f8fafc;
    padding: 1.25rem;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 700;
    color: #101827;
}


/* =========================================================
   Input states
   ========================================================= */

.prime-factorization-number-input.is-correct,
.prime-factorization-text-input.is-correct {
    border-color: #15803d;
    background: #f0fdf4;
}

.prime-factorization-number-input.is-incorrect,
.prime-factorization-text-input.is-incorrect {
    border-color: #dc2626;
    background: #fef2f2;
}

.prime-factorization-number-input:disabled,
.prime-factorization-text-input:disabled {
    background: #f3f5f8;
    color: #64748b;
    cursor: not-allowed;
    opacity: 1;
}


/* =========================================================
   Feedback
   ========================================================= */

.prime-factorization-feedback {
    max-width: 860px;
    margin: 1.5rem auto 0;
    border: 1px solid #cfd8e3;
    border-radius: .9rem;
    padding: 1rem 1.2rem;
    font-weight: 700;
    line-height: 1.65;
}

.prime-factorization-feedback.success {
    border-color: #86cda9;
    background: #f0fdf4;
    color: #166534;
}

.prime-factorization-feedback.error {
    border-color: #f0a7a7;
    background: #fef2f2;
    color: #991b1b;
}

.prime-factorization-feedback.info {
    border-color: #9cc8df;
    background: #eff6ff;
    color: #075985;
}

.prime-factorization-feedback[hidden] {
    display: none;
}


/* =========================================================
   Hint
   ========================================================= */

.prime-factorization-hint-button {
    display: block;
    margin: 1.5rem auto 0;
    border: none;
    background: transparent;
    color: #0f766e;
    font-weight: 800;
    text-decoration: underline;
    text-underline-offset: .2rem;
}

.prime-factorization-hint-button:hover {
    color: #0b5f59;
}

.prime-factorization-hint {
    max-width: 860px;
    margin: 1rem auto 0;
    border-left: 4px solid #0f766e;
    border-radius: .2rem .8rem .8rem .2rem;
    background: #ecfdf8;
    padding: 1rem 1.2rem;
    color: #33504d;
    line-height: 1.65;
}

.prime-factorization-hint[hidden] {
    display: none;
}


/* =========================================================
   Completion
   ========================================================= */

.prime-factorization-completion {
    max-width: 860px;
    margin: 2rem auto 0;
    border: 1px solid #86cda9;
    border-radius: 1rem;
    background: #f0fdf4;
    padding: 2rem;
    text-align: center;
}

.prime-factorization-completion[hidden] {
    display: none;
}

.prime-factorization-completion-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.5rem;
    height: 3.5rem;
    margin-bottom: 1rem;
    border-radius: 50%;
    background: #15803d;
    color: #ffffff;
    font-size: 1.5rem;
    font-weight: 800;
}

.prime-factorization-completion h3 {
    color: #14532d;
    font-weight: 800;
}

.prime-factorization-final-answer {
    margin: 1.5rem 0;
    color: #101827;
    font-size: 1.5rem;
    font-weight: 800;
}

.prime-factorization-completion-explanation {
    max-width: 700px;
    margin: 0 auto 1.5rem;
    line-height: 1.7;
}


/* =========================================================
   Reminder cards
   ========================================================= */

.prime-factorization-reminders-grid,
.prime-factorization-uses-grid {
    display: grid;
    grid-template-columns: repeat(4,minmax(0,1fr));
    gap: 1rem;
}

.prime-factorization-uses-grid {
    grid-template-columns: repeat(3,minmax(0,1fr));
}

.prime-factorization-reminder-card,
.prime-factorization-use-card {
    height: 100%;
    border: 1px solid #dce3eb;
    border-radius: 1rem;
    background: #ffffff;
    padding: 1.5rem;
    box-shadow: 0 12px 30px rgba(16,24,39,.05);
}

.prime-factorization-reminder-card h3,
.prime-factorization-use-card h3 {
    margin-bottom: .75rem;
    color: #101827;
    font-size: 1.1rem;
    font-weight: 800;
}

.prime-factorization-reminder-card p,
.prime-factorization-use-card p {
    color: #5b6678;
    line-height: 1.65;
}

.prime-factorization-example {
    margin-top: 1rem;
    border-radius: .75rem;
    background: #ecfdf8;
    padding: .75rem;
    color: #0f766e;
    text-align: center;
    font-weight: 800;
}

.prime-factorization-use-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    margin-bottom: 1rem;
    border-radius: 50%;
    background: #0f766e;
    color: #ffffff;
}

.prime-factorization-use-icon svg {
    width: 1.3rem;
    height: 1.3rem;
}


/* =========================================================
   Final CTA
   ========================================================= */

.prime-factorization-final-cta-card {
    max-width: 900px;
    margin: 0 auto;
    border-radius: 1.25rem;
    background: #101827;
    color: #ffffff;
    padding: 3rem;
    text-align: center;
}

.prime-factorization-final-cta-card h2 {
    color: #ffffff;
    font-weight: 800;
}

.prime-factorization-final-cta-card p:not(.prime-factorization-eyebrow) {
    max-width: 700px;
    margin: 0 auto 2rem;
    color: rgba(255,255,255,.82);
    line-height: 1.75;
}

.prime-factorization-final-cta-card
.prime-factorization-eyebrow {
    color: #5eead4;
}


/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 992px)
{

    .prime-factorization-overview-grid,
    .prime-factorization-reminders-grid,
    .prime-factorization-uses-grid {
        grid-template-columns: repeat(2,1fr);
    }

    .prime-factorization-settings {
        grid-template-columns: 1fr;
    }

    .prime-factorization-tool-header {
        flex-direction: column;
        align-items: stretch;
    }

}

@media (max-width: 768px)
{

    .prime-factorization-overview-grid,
    .prime-factorization-reminders-grid,
    .prime-factorization-uses-grid {
        grid-template-columns: 1fr;
    }

    .prime-factorization-progress {
        padding: 1.5rem 1rem;
    }

    .prime-factorization-progress-line {
        width: 50px;
    }

    .prime-factorization-factor-pair {
        flex-direction: column;
    }

    .prime-factorization-multiply-symbol {
        transform: rotate(90deg);
    }

    .prime-factorization-workspace {
        padding: 1rem;
    }

    .prime-factorization-work-step {
        padding: 1.5rem;
    }

    .prime-factorization-final-cta-card {
        padding: 2rem 1.5rem;
    }

}