/* =========================================================
   FRACTION ADDITION & SUBTRACTION TOOL
========================================================= */

:root {
    --fraction-navy: #17253d;
    --fraction-teal: #0d806e;
    --fraction-teal-dark: #096858;
    --fraction-teal-light: #e9f7f4;
    --fraction-blue-light: #f2f7fb;
    --fraction-border: #dce5ec;
    --fraction-text: #5d6878;
    --fraction-white: #ffffff;
    --fraction-success: #198754;
    --fraction-success-bg: #eaf7ef;
    --fraction-error: #c0392b;
    --fraction-error-bg: #fff0ee;
    --fraction-shadow: 0 18px 45px rgba(23, 37, 61, 0.08);
}


/* =========================================================
   SHARED
========================================================= */

.fraction-eyebrow {
    margin-bottom: 0.75rem;
    color: var(--fraction-teal);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.fraction-section-heading {
    max-width: 760px;
    margin: 0 auto 3rem;
    text-align: center;
}

.fraction-section-heading h2 {
    margin-bottom: 1rem;
    color: var(--fraction-navy);
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 800;
    line-height: 1.15;
}

.fraction-section-heading > p:not(.fraction-eyebrow) {
    margin-bottom: 0;
    color: var(--fraction-text);
    font-size: 1.05rem;
    line-height: 1.8;
}


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

.fraction-hero {
    position: relative;
    overflow: hidden;
    padding: 7rem 0 6rem;
    background:
        radial-gradient(
            circle at 15% 20%,
            rgba(13, 128, 110, 0.14),
            transparent 35%
        ),
        radial-gradient(
            circle at 85% 75%,
            rgba(47, 111, 166, 0.12),
            transparent 35%
        ),
        linear-gradient(135deg, #f8fbfd 0%, #eef6f8 100%);
}

.fraction-hero::before,
.fraction-hero::after {
    position: absolute;
    border-radius: 50%;
    content: "";
    pointer-events: none;
}

.fraction-hero::before {
    top: -90px;
    right: -70px;
    width: 280px;
    height: 280px;
    border: 40px solid rgba(13, 128, 110, 0.07);
}

.fraction-hero::after {
    bottom: -120px;
    left: -80px;
    width: 320px;
    height: 320px;
    border: 50px solid rgba(23, 37, 61, 0.05);
}

.fraction-hero-content {
    position: relative;
    z-index: 1;
    max-width: 820px;
    margin: 0 auto;
    text-align: center;
}

.fraction-hero h1 {
    margin-bottom: 1.5rem;
    color: var(--fraction-navy);
    font-size: clamp(2.6rem, 6vw, 4.5rem);
    font-weight: 850;
    letter-spacing: -0.04em;
    line-height: 1.05;
}

.fraction-hero-description {
    max-width: 700px;
    margin: 0 auto 2rem;
    color: var(--fraction-text);
    font-size: 1.15rem;
    line-height: 1.85;
}


/* =========================================================
   OVERVIEW
========================================================= */

.fraction-overview {
    padding: 5.5rem 0;
    background: var(--fraction-white);
}

.fraction-overview-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.25rem;
}

.fraction-overview-card {
    position: relative;
    padding: 2rem 1.5rem;
    background: var(--fraction-white);
    border: 1px solid var(--fraction-border);
    border-radius: 1.1rem;
    box-shadow: 0 10px 30px rgba(23, 37, 61, 0.05);
    transition:
        transform 0.25s ease,
        box-shadow 0.25s ease,
        border-color 0.25s ease;
}

.fraction-overview-card:hover {
    transform: translateY(-5px);
    border-color: rgba(13, 128, 110, 0.35);
    box-shadow: var(--fraction-shadow);
}

.fraction-step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin-bottom: 1.25rem;
    color: var(--fraction-white);
    background: var(--fraction-teal);
    border-radius: 50%;
    font-size: 1rem;
    font-weight: 800;
}

.fraction-overview-card h3 {
    margin-bottom: 0.75rem;
    color: var(--fraction-navy);
    font-size: 1.2rem;
    font-weight: 800;
}

.fraction-overview-card p {
    margin-bottom: 0;
    color: var(--fraction-text);
    line-height: 1.75;
}


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

.fraction-practice-section {
    padding: 5.5rem 0;
    background: var(--fraction-blue-light);
}

.fraction-tool {
    overflow: hidden;
    max-width: 1050px;
    margin: 0 auto;
    background: var(--fraction-white);
    border: 1px solid var(--fraction-border);
    border-radius: 1.4rem;
    box-shadow: var(--fraction-shadow);
}


/* =========================================================
   TOOL HEADER
========================================================= */

.fraction-tool-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    padding: 2.25rem 2.5rem;
    background: linear-gradient(
        135deg,
        var(--fraction-navy) 0%,
        #223657 100%
    );
}

.fraction-tool-header h2 {
    margin-bottom: 0;
    color: var(--fraction-white);
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 800;
}

.fraction-tool-header .fraction-eyebrow {
    color: #8fe0d2;
}

.fraction-scoreboard {
    display: flex;
    gap: 0.75rem;
}

.fraction-score-item {
    min-width: 88px;
    padding: 0.8rem 1rem;
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.13);
    border-radius: 0.8rem;
}

.fraction-score-label {
    display: block;
    margin-bottom: 0.2rem;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.fraction-score-item strong {
    color: var(--fraction-white);
    font-size: 1.35rem;
}


/* =========================================================
   SETTINGS
========================================================= */

.fraction-settings {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    align-items: end;
    gap: 1rem;
    padding: 1.5rem 2.5rem;
    background: #fbfcfd;
    border-bottom: 1px solid var(--fraction-border);
}

.fraction-setting-group label {
    display: block;
    margin-bottom: 0.45rem;
    color: var(--fraction-navy);
    font-size: 0.85rem;
    font-weight: 750;
}

.fraction-setting-group .form-select {
    min-height: 48px;
    border-color: var(--fraction-border);
    border-radius: 0.7rem;
}

.fraction-settings .btn {
    min-height: 48px;
    white-space: nowrap;
}


/* =========================================================
   PROBLEM DISPLAY
========================================================= */

.fraction-problem-area {
    padding: 2.75rem 2rem 2.25rem;
    text-align: center;
}

.fraction-problem-label {
    margin-bottom: 0.75rem;
    color: var(--fraction-text);
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.fraction-expression {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.4rem;
    min-height: 130px;
    color: var(--fraction-navy);
    font-size: 2.7rem;
    font-weight: 800;
}

.display-fraction {
    display: inline-grid;
    grid-template-rows: 1fr 1fr;
    min-width: 72px;
    text-align: center;
    line-height: 1.1;
}

.display-fraction .fraction-numerator {
    padding: 0 0.45rem 0.25rem;
    border-bottom: 3px solid currentColor;
}

.display-fraction .fraction-denominator {
    padding: 0.25rem 0.45rem 0;
}

.fraction-operation {
    color: var(--fraction-teal);
    font-size: 2.5rem;
    font-weight: 800;
}


/* =========================================================
   PROGRESS
========================================================= */

.fraction-progress {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 0 2.5rem 2.25rem;
}

.fraction-progress-step {
    position: relative;
    z-index: 1;
    min-width: 88px;
    text-align: center;
}

.fraction-progress-step span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    color: #8691a0;
    background: #eef2f5;
    border: 2px solid #dbe2e8;
    border-radius: 50%;
    font-weight: 800;
    transition: all 0.25s ease;
}

.fraction-progress-step p {
    margin: 0.55rem 0 0;
    color: #8993a0;
    font-size: 0.78rem;
    font-weight: 750;
}

.fraction-progress-step.active span {
    color: var(--fraction-white);
    background: var(--fraction-teal);
    border-color: var(--fraction-teal);
    box-shadow: 0 0 0 5px rgba(13, 128, 110, 0.12);
}

.fraction-progress-step.active p {
    color: var(--fraction-teal);
}

.fraction-progress-step.completed span {
    color: var(--fraction-white);
    background: var(--fraction-success);
    border-color: var(--fraction-success);
}

.fraction-progress-step.completed p {
    color: var(--fraction-success);
}

.fraction-progress-line {
    width: 80px;
    height: 2px;
    margin-top: 19px;
    background: #dbe2e8;
}


/* =========================================================
   WORKSPACE
========================================================= */

.fraction-workspace {
    position: relative;
    margin: 0 2.5rem 2.5rem;
    padding: 2.5rem;
    text-align: center;
    background: #fbfcfd;
    border: 1px solid var(--fraction-border);
    border-radius: 1.1rem;
}

.fraction-work-step[hidden] {
    display: none !important;
}

.fraction-work-step.active {
    display: block;
}

.fraction-work-label {
    margin-bottom: 0.5rem;
    color: var(--fraction-teal);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.fraction-work-step h3 {
    margin-bottom: 0.8rem;
    color: var(--fraction-navy);
    font-size: 1.65rem;
    font-weight: 800;
}

.fraction-step-instruction {
    max-width: 650px;
    margin: 0 auto 1.75rem;
    color: var(--fraction-text);
    line-height: 1.75;
}


/* =========================================================
   ANSWER CONTROLS
========================================================= */

.fraction-answer-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    max-width: 420px;
    margin: 0 auto;
}

.fraction-number-input {
    max-width: 180px;
    min-height: 52px;
    text-align: center;
    border-color: var(--fraction-border);
    border-radius: 0.7rem;
    font-size: 1.15rem;
    font-weight: 700;
}

.fraction-rewrite-row {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.75rem;
}

.fraction-input-group label {
    display: block;
    margin-bottom: 0.65rem;
    color: var(--fraction-text);
    font-size: 0.82rem;
    font-weight: 750;
}

.fraction-input {
    display: inline-grid;
    grid-template-rows: 1fr auto 1fr;
    width: 95px;
    vertical-align: middle;
}

.fraction-input input {
    width: 100%;
    height: 48px;
    padding: 0.3rem;
    text-align: center;
    color: var(--fraction-navy);
    background: var(--fraction-white);
    border: 1px solid var(--fraction-border);
    border-radius: 0.5rem;
    font-size: 1.2rem;
    font-weight: 750;
}

.fraction-input span {
    display: block;
    height: 3px;
    margin: 0.35rem 0;
    background: var(--fraction-navy);
    border-radius: 10px;
}

.fraction-input-centered {
    display: grid;
    margin: 0 auto 1.5rem;
}

.fraction-input input:focus,
.fraction-number-input:focus,
.fraction-setting-group .form-select:focus {
    border-color: var(--fraction-teal);
    box-shadow: 0 0 0 0.2rem rgba(13, 128, 110, 0.13);
    outline: none;
}


/* =========================================================
   FEEDBACK
========================================================= */

.fraction-feedback {
    max-width: 650px;
    margin: 1.5rem auto 0;
    padding: 1rem 1.2rem;
    border-radius: 0.75rem;
    font-weight: 700;
    line-height: 1.6;
}

.fraction-feedback.success {
    color: var(--fraction-success);
    background: var(--fraction-success-bg);
    border: 1px solid rgba(25, 135, 84, 0.2);
}

.fraction-feedback.error {
    color: var(--fraction-error);
    background: var(--fraction-error-bg);
    border: 1px solid rgba(192, 57, 43, 0.2);
}

.fraction-hint-button {
    margin-top: 1.5rem;
    padding: 0;
    color: var(--fraction-teal);
    background: transparent;
    border: 0;
    font-weight: 750;
    text-decoration: underline;
    text-underline-offset: 4px;
}

.fraction-hint-button:hover {
    color: var(--fraction-teal-dark);
}

.fraction-hint {
    max-width: 650px;
    margin: 1rem auto 0;
    padding: 1rem 1.2rem;
    color: #725c14;
    background: #fff9df;
    border: 1px solid #f0dfa2;
    border-radius: 0.75rem;
    line-height: 1.65;
}


/* =========================================================
   COMPLETION
========================================================= */

.fraction-completion {
    max-width: 650px;
    margin: 0 auto;
    text-align: center;
}

.fraction-completion-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 70px;
    height: 70px;
    margin-bottom: 1rem;
    color: var(--fraction-white);
    background: var(--fraction-success);
    border-radius: 50%;
    font-size: 2rem;
    font-weight: 800;
    box-shadow: 0 0 0 9px rgba(25, 135, 84, 0.12);
}

.fraction-completion h3 {
    margin-bottom: 0.75rem;
    color: var(--fraction-navy);
    font-size: 2rem;
    font-weight: 800;
}

.fraction-completion p {
    color: var(--fraction-text);
}

.fraction-final-answer {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 130px;
    margin: 0.75rem 0 1.75rem;
    padding: 1rem 1.5rem;
    color: var(--fraction-navy);
    background: var(--fraction-teal-light);
    border: 1px solid rgba(13, 128, 110, 0.2);
    border-radius: 0.8rem;
    font-size: 1.5rem;
    font-weight: 800;
}


/* =========================================================
   REMINDERS
========================================================= */

.fraction-reminders {
    padding: 5.5rem 0;
    background: var(--fraction-white);
}

.fraction-reminders-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
}

.fraction-reminder-card {
    padding: 2rem;
    background: var(--fraction-white);
    border: 1px solid var(--fraction-border);
    border-radius: 1rem;
    box-shadow: 0 10px 30px rgba(23, 37, 61, 0.05);
}

.fraction-reminder-card h3 {
    margin-bottom: 0.75rem;
    color: var(--fraction-navy);
    font-size: 1.25rem;
    font-weight: 800;
}

.fraction-reminder-card p {
    margin-bottom: 1.25rem;
    color: var(--fraction-text);
    line-height: 1.7;
}

.fraction-example {
    padding: 0.9rem 1rem;
    color: var(--fraction-navy);
    background: var(--fraction-teal-light);
    border-left: 4px solid var(--fraction-teal);
    border-radius: 0.45rem;
    font-size: 1.05rem;
    font-weight: 750;
}


/* =========================================================
   FINAL CTA
========================================================= */

.fraction-final-cta {
    padding: 5rem 0;
    background: linear-gradient(180deg, #f4f8fa 0%, #edf4f7 100%);
}

.fraction-final-cta-card {
    max-width: 900px;
    margin: 0 auto;
    padding: 3.5rem;
    text-align: center;
    background: var(--fraction-white);
    border: 1px solid var(--fraction-border);
    border-radius: 1.25rem;
    box-shadow: var(--fraction-shadow);
}

.fraction-final-cta-card h2 {
    margin-bottom: 1rem;
    color: var(--fraction-navy);
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 800;
}

.fraction-final-cta-card > p:not(.fraction-eyebrow) {
    max-width: 680px;
    margin: 0 auto 2rem;
    color: var(--fraction-text);
    font-size: 1.05rem;
    line-height: 1.8;
}


/* =========================================================
   BUTTON FALLBACKS
========================================================= */

.btn-teal {
    color: var(--fraction-white);
    background: var(--fraction-teal);
    border-color: var(--fraction-teal);
}

.btn-teal:hover,
.btn-teal:focus {
    color: var(--fraction-white);
    background: var(--fraction-teal-dark);
    border-color: var(--fraction-teal-dark);
}

.btn-outline-teal {
    color: var(--fraction-teal);
    background: transparent;
    border-color: var(--fraction-teal);
}

.btn-outline-teal:hover,
.btn-outline-teal:focus {
    color: var(--fraction-white);
    background: var(--fraction-teal);
    border-color: var(--fraction-teal);
}


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

@media (max-width: 991.98px) {

    .fraction-overview-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .fraction-tool-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .fraction-scoreboard {
        width: 100%;
    }

    .fraction-score-item {
        flex: 1;
    }

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

    .fraction-settings .btn {
        grid-column: 1 / -1;
    }

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

}


@media (max-width: 767.98px) {

    .fraction-hero {
        padding: 5.5rem 0 4.5rem;
    }

    .fraction-overview,
    .fraction-practice-section,
    .fraction-reminders {
        padding: 4rem 0;
    }

    .fraction-tool-header,
    .fraction-settings {
        padding-right: 1.5rem;
        padding-left: 1.5rem;
    }

    .fraction-scoreboard {
        gap: 0.45rem;
    }

    .fraction-score-item {
        min-width: 0;
        padding: 0.7rem 0.45rem;
    }

    .fraction-problem-area {
        padding-right: 1.25rem;
        padding-left: 1.25rem;
    }

    .fraction-progress {
        padding-right: 1rem;
        padding-left: 1rem;
    }

    .fraction-progress-step {
        min-width: 62px;
    }

    .fraction-progress-line {
        width: 35px;
    }

    .fraction-workspace {
        margin-right: 1.25rem;
        margin-left: 1.25rem;
        padding: 2rem 1.25rem;
    }

    .fraction-rewrite-row {
        gap: 1rem;
    }

}


@media (max-width: 575.98px) {

    .fraction-hero h1 {
        font-size: 2.55rem;
    }

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

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

    .fraction-settings .btn {
        grid-column: auto;
    }

    .fraction-expression {
        gap: 0.9rem;
        font-size: 2.15rem;
    }

    .fraction-operation {
        font-size: 2rem;
    }

    .display-fraction {
        min-width: 58px;
    }

    .fraction-progress {
        justify-content: space-between;
    }

    .fraction-progress-step {
        min-width: 50px;
    }

    .fraction-progress-step p {
        font-size: 0.67rem;
    }

    .fraction-progress-line {
        flex: 1;
        width: auto;
        min-width: 12px;
    }

    .fraction-answer-row {
        align-items: stretch;
        flex-direction: column;
    }

    .fraction-number-input {
        max-width: none;
    }

    .fraction-rewrite-row {
        align-items: center;
        flex-direction: column;
    }

    .fraction-rewrite-row .fraction-operation {
        margin: -0.25rem 0;
    }

    .fraction-final-cta-card {
        padding: 2.25rem 1.4rem;
    }

}

/* =========================================================
   CUMULATIVE WORKSPACE
========================================================= */

.fraction-work-step {
    padding: 1.75rem 0;
    border-bottom: 1px solid var(--fraction-border);
}

.fraction-work-step:first-child {
    padding-top: 0;
}

.fraction-work-step:last-of-type {
    border-bottom: 0;
}

.fraction-work-step.completed {
    opacity: 0.82;
}

.fraction-work-step.completed .fraction-work-label {
    color: var(--fraction-success);
}

.fraction-work-step.completed .fraction-work-label::after {
    margin-left: 0.45rem;
    content: "✓ Completed";
}

.fraction-work-step.active {
    opacity: 1;
}

.fraction-work-step input[readonly] {
    color: var(--fraction-navy);
    background: var(--fraction-teal-light);
    border-color: rgba(13, 128, 110, 0.24);
    cursor: default;
}

.fraction-feedback,
.fraction-hint,
.fraction-completion {
    margin-top: 2rem;
}

#stepOne .fraction-feedback {
    margin-top: 1rem;
    margin-bottom: 0;
}

/*
|--------------------------------------------------------------------------
| Zero-answer simplify input
|--------------------------------------------------------------------------
*/

.fraction-input.fraction-zero-answer {
    display: flex;
    justify-content: center;
    align-items: center;
}

.fraction-input.fraction-zero-answer input {
    width: 5rem;
    min-height: 3rem;
    text-align: center;
}

.fraction-input.fraction-zero-answer > span,
.fraction-input.fraction-zero-answer
    #simplifiedDenominator {
    display: none;
}