/* =========================================================
   APPLICATIONS OF INTEGRALS
   Raul The Tutor
   ========================================================= */


/* =========================================================
   BASE
   ========================================================= */

#applications-of-integrals-guide {
    --aoi-blue: #0f5f8f;
    --aoi-blue-dark: #0a4569;
    --aoi-blue-light: #eaf5fb;

    --aoi-teal: #159a9c;
    --aoi-teal-dark: #0f7476;
    --aoi-teal-light: #e9f8f7;

    --aoi-green: #24855b;
    --aoi-green-light: #edf8f2;

    --aoi-orange: #c96d1b;
    --aoi-orange-light: #fff5e9;

    --aoi-red: #b84a4a;
    --aoi-red-light: #fff1f1;

    --aoi-purple: #7154a3;
    --aoi-purple-light: #f4effb;

    --aoi-ink: #1e293b;
    --aoi-text: #475569;
    --aoi-muted: #64748b;

    --aoi-border: #dbe5ec;
    --aoi-soft: #f7fafc;

    --aoi-shadow:
        0 10px 30px rgba(15, 95, 143, 0.08);

    --aoi-shadow-hover:
        0 16px 38px rgba(15, 95, 143, 0.14);
}


#applications-of-integrals-guide,
#applications-of-integrals-guide p,
#applications-of-integrals-guide li {
    color: var(--aoi-text);
}


#applications-of-integrals-guide h2,
#applications-of-integrals-guide h3 {
    color: var(--aoi-ink);
}


#applications-of-integrals-guide h2 {
    font-weight: 800;
    line-height: 1.2;
}


#applications-of-integrals-guide h3 {
    font-weight: 700;
    line-height: 1.3;
}


#applications-of-integrals-guide strong {
    color: var(--aoi-ink);
}


#applications-of-integrals-guide .MathJax {
    max-width: 100%;
}



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

.aoi-intro {
    max-width: 820px;
}


.aoi-intro h2 {
    margin-bottom: 1rem;
}


.aoi-intro .lead {
    color: var(--aoi-ink) !important;
    font-weight: 600;
}


.aoi-eyebrow,
.aoi-section-eyebrow,
.aoi-card-label {
    margin-bottom: 0.5rem;
    color: var(--aoi-blue) !important;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}


.aoi-section-eyebrow {
    margin-bottom: 0.65rem;
}



/* =========================================================
   GENERAL SECTION SPACING
   ========================================================= */

.aoi-section {
    margin-top: 5.5rem;
}


.aoi-section-heading {
    margin-bottom: 2rem;
}


.aoi-section-heading h2 {
    margin-bottom: 0.8rem;
}


.aoi-section-heading > p:last-child {
    max-width: 760px;
    margin-bottom: 0;
}



/* =========================================================
   STANDARD CARD STYLING
   ========================================================= */

.aoi-definition-card,
.aoi-idea-card,
.aoi-formula-card,
.aoi-definition-large-card,
.aoi-example-card,
.aoi-warning-card,
.aoi-tip-card,
.aoi-memory-card,
.aoi-ftc-card,
.aoi-units-card,
.aoi-final-card,
.aoi-practice-cta {
    border: 1px solid var(--aoi-border);
    border-radius: 18px;
    background: #fff;
    box-shadow: var(--aoi-shadow);
}



/* =========================================================
   DEFINITION CARD
   ========================================================= */

.aoi-definition-card {
    display: flex;
    align-items: center;
    gap: 1.4rem;
    padding: 1.7rem 1.8rem;
    border-left: 5px solid var(--aoi-blue);
}


.aoi-definition-icon {
    display: flex;
    flex: 0 0 54px;
    align-items: center;
    justify-content: center;

    width: 54px;
    height: 54px;

    border-radius: 14px;

    background: var(--aoi-blue-light);
    color: var(--aoi-blue);

    font-size: 1.35rem;
}


.aoi-definition-math {
    font-size: 1.08rem;
}



/* =========================================================
   BIG IDEA CARD
   ========================================================= */

.aoi-idea-card {
    padding: 1.7rem 1.8rem;
    border-left: 5px solid var(--aoi-teal);
    background:
        linear-gradient(
            135deg,
            #ffffff 0%,
            var(--aoi-teal-light) 100%
        );
}


.aoi-idea-heading,
.aoi-warning-heading {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.15rem;
}


.aoi-idea-heading h3,
.aoi-warning-heading h3 {
    margin-bottom: 0;
}


.aoi-idea-icon,
.aoi-warning-icon {
    display: flex;
    flex: 0 0 48px;
    align-items: center;
    justify-content: center;

    width: 48px;
    height: 48px;

    border-radius: 50%;

    font-size: 1.15rem;
}


.aoi-idea-icon {
    background: #d8f3f1;
    color: var(--aoi-teal-dark);
}



/* =========================================================
   FORMULA CARDS
   ========================================================= */

.aoi-formula-card,
.aoi-definition-large-card {
    padding: 1.8rem 1.5rem;
    overflow-x: auto;
    text-align: center;
}


.aoi-formula-card {
    border-top: 4px solid var(--aoi-blue);
    background:
        linear-gradient(
            180deg,
            #ffffff 0%,
            #f6fbfe 100%
        );
}


.aoi-definition-large-card {
    border-top: 4px solid var(--aoi-teal);
    background:
        linear-gradient(
            180deg,
            #ffffff 0%,
            var(--aoi-teal-light) 100%
        );
}


.aoi-formula-card .aoi-card-label,
.aoi-definition-large-card .aoi-card-label {
    text-align: left;
}


.aoi-definition-large-card p:last-child {
    margin-top: 1rem;
}



/* =========================================================
   EXAMPLE CARDS
   ========================================================= */

.aoi-example-card {
    position: relative;
    padding: 2rem;
    overflow: hidden;
}


.aoi-example-card::before {
    position: absolute;
    top: 0;
    left: 0;

    width: 5px;
    height: 100%;

    background: var(--aoi-green);

    content: "";
}


.aoi-example-card h3 {
    margin-bottom: 1.25rem;
}


.aoi-example-card p {
    line-height: 1.7;
}


.aoi-answer-box {
    margin-top: 1.5rem;
    padding: 1.15rem 1rem;

    border: 1px solid #cce9d9;
    border-radius: 12px;

    background: var(--aoi-green-light);

    text-align: center;
}


.aoi-answer-box .MathJax {
    color: #16613f;
}



/* =========================================================
   COMPARISON CARDS
   ========================================================= */

.aoi-comparison-grid,
.aoi-method-grid,
.aoi-radius-grid,
.aoi-shell-grid,
.aoi-motion-grid,
.aoi-method-choice-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
}


.aoi-comparison-card,
.aoi-method-card,
.aoi-radius-card,
.aoi-shell-card,
.aoi-motion-card,
.aoi-method-choice-card {
    padding: 1.6rem;

    border: 1px solid var(--aoi-border);
    border-radius: 16px;

    background: #fff;
    box-shadow: var(--aoi-shadow);
}


.aoi-comparison-card:nth-child(1),
.aoi-method-card:nth-child(1),
.aoi-radius-card:nth-child(1),
.aoi-motion-card:nth-child(1),
.aoi-method-choice-card:nth-child(1) {
    border-top: 4px solid var(--aoi-blue);
}


.aoi-comparison-card:nth-child(2),
.aoi-method-card:nth-child(2),
.aoi-radius-card:nth-child(2),
.aoi-motion-card:nth-child(2),
.aoi-method-choice-card:nth-child(2) {
    border-top: 4px solid var(--aoi-teal);
}


.aoi-shell-card {
    border-top: 4px solid var(--aoi-purple);
}



/* =========================================================
   WARNING
   ========================================================= */

.aoi-warning-card {
    padding: 1.6rem 1.8rem;

    border-color: #f1cccc;
    border-left: 5px solid var(--aoi-red);

    background:
        linear-gradient(
            135deg,
            #ffffff 0%,
            var(--aoi-red-light) 100%
        );
}


.aoi-warning-icon {
    background: #f8dede;
    color: var(--aoi-red);
}


.aoi-warning-card .aoi-card-label {
    color: var(--aoi-red) !important;
}



/* =========================================================
   TIPS
   ========================================================= */

.aoi-tip-card {
    display: flex;
    align-items: flex-start;
    gap: 1.1rem;

    padding: 1.5rem 1.7rem;

    border-left: 5px solid var(--aoi-orange);

    background:
        linear-gradient(
            135deg,
            #ffffff 0%,
            var(--aoi-orange-light) 100%
        );
}


.aoi-tip-icon {
    display: flex;
    flex: 0 0 46px;
    align-items: center;
    justify-content: center;

    width: 46px;
    height: 46px;

    border-radius: 50%;

    background: #ffe5c5;
    color: var(--aoi-orange);

    font-size: 1.1rem;
}


.aoi-tip-card .aoi-card-label {
    color: var(--aoi-orange) !important;
}



/* =========================================================
   MEMORY CARD
   ========================================================= */

.aoi-memory-card {
    padding: 1.5rem;

    border-left: 5px solid var(--aoi-purple);

    background:
        linear-gradient(
            135deg,
            #ffffff 0%,
            var(--aoi-purple-light) 100%
        );

    text-align: center;
}


.aoi-memory-card .aoi-card-label {
    color: var(--aoi-purple) !important;
}



/* =========================================================
   FTC CARD
   ========================================================= */

.aoi-ftc-card {
    padding: 1.6rem;

    border-left: 5px solid var(--aoi-teal);

    background: var(--aoi-teal-light);

    text-align: center;
}



/* =========================================================
   UNITS
   ========================================================= */

.aoi-units-card {
    padding: 2rem;
}


.aoi-units-example {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;

    margin: 1.6rem 0;
}


.aoi-units-example span {
    padding: 0.75rem 1rem;

    border: 1px solid var(--aoi-border);
    border-radius: 10px;

    background: var(--aoi-soft);

    color: var(--aoi-ink);

    font-weight: 700;
}


.aoi-units-example svg {
    color: var(--aoi-blue);
}



/* =========================================================
   METHOD CHOICE
   ========================================================= */

.aoi-method-choice-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.05rem;
}



/* =========================================================
   COMMON MISTAKES
   ========================================================= */

.aoi-mistake-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.15rem;
}


.aoi-mistake-card {
    position: relative;

    min-height: 175px;
    padding: 1.55rem 1.55rem 1.55rem 4.7rem;

    border: 1px solid var(--aoi-border);
    border-radius: 16px;

    background: #fff;
    box-shadow: var(--aoi-shadow);
}


.aoi-mistake-number {
    position: absolute;
    top: 1.45rem;
    left: 1.4rem;

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

    width: 38px;
    height: 38px;

    border-radius: 50%;

    background: var(--aoi-red-light);
    color: var(--aoi-red);

    font-weight: 800;
}


.aoi-mistake-card h3 {
    margin-bottom: 0.65rem;
    font-size: 1.02rem;
}



/* =========================================================
   STRATEGY ROADMAP
   ========================================================= */

.aoi-roadmap {
    display: flex;
    flex-direction: column;
    align-items: stretch;
}


.aoi-roadmap-step {
    display: flex;
    align-items: center;
    gap: 1.25rem;

    padding: 1.5rem 1.7rem;

    border: 1px solid var(--aoi-border);
    border-radius: 16px;

    background: #fff;
    box-shadow: var(--aoi-shadow);
}


.aoi-roadmap-step h3 {
    margin-bottom: 0.4rem;
}


.aoi-roadmap-number {
    display: flex;
    flex: 0 0 48px;
    align-items: center;
    justify-content: center;

    width: 48px;
    height: 48px;

    border-radius: 50%;

    background: var(--aoi-blue);
    color: #fff;

    font-size: 1.05rem;
    font-weight: 800;
}


.aoi-roadmap-arrow {
    padding: 0.55rem 0;

    color: var(--aoi-blue);

    text-align: center;
}



/* =========================================================
   QUICK REFERENCE
   ========================================================= */

.aoi-reference-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.15rem;
}


.aoi-reference-card {
    display: flex;
    flex-direction: column;
    justify-content: center;

    min-height: 150px;
    padding: 1.4rem;

    border: 1px solid var(--aoi-border);
    border-radius: 16px;

    background:
        linear-gradient(
            180deg,
            #ffffff 0%,
            #f8fbfd 100%
        );

    box-shadow: var(--aoi-shadow);

    text-align: center;
}


.aoi-reference-card .aoi-card-label {
    text-align: left;
}



/* =========================================================
   FINAL CHECKLIST
   ========================================================= */

.aoi-final-card {
    padding: 2rem;

    border-top: 5px solid var(--aoi-blue);

    background:
        linear-gradient(
            180deg,
            #ffffff 0%,
            #f5fafe 100%
        );
}


.aoi-final-card h2 {
    margin-bottom: 1.6rem;
}


.aoi-final-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.85rem 2rem;

    margin: 0;
    padding-left: 1.5rem;
}


.aoi-final-list li {
    padding-left: 0.25rem;
    line-height: 1.55;
}


.aoi-final-list li::marker {
    color: var(--aoi-blue);
    font-weight: 800;
}



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

.aoi-practice-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;

    padding: 2rem;

    border: 0;

    background:
        linear-gradient(
            135deg,
            var(--aoi-blue-dark) 0%,
            var(--aoi-blue) 60%,
            var(--aoi-teal) 100%
        );

    box-shadow:
        0 16px 40px rgba(15, 95, 143, 0.2);
}


.aoi-practice-cta h2,
.aoi-practice-cta p {
    color: #fff !important;
}


.aoi-practice-cta h2 {
    margin-bottom: 0.65rem;
}


.aoi-practice-cta p {
    max-width: 580px;
    margin-bottom: 0;
    opacity: 0.9;
}


.aoi-practice-cta .aoi-card-label {
    color: rgba(255, 255, 255, 0.8) !important;
}


.aoi-practice-cta .btn {
    flex-shrink: 0;

    border-color: #fff;

    background: #fff;
    color: var(--aoi-blue-dark);

    font-weight: 700;
}


.aoi-practice-cta .btn:hover {
    border-color: #fff;
    background: #f4f9fc;
    color: var(--aoi-blue-dark);
}



/* =========================================================
   RELATED RESOURCES
   ========================================================= */

.aoi-related-section {
    padding-top: 1rem;
}


.aoi-related-section > h2 {
    margin-bottom: 1.7rem;
}


.aoi-related-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
}


.aoi-related-card {
    display: block;
    position: relative;

    padding: 1.6rem;

    border: 1px solid var(--aoi-border);
    border-radius: 16px;

    background: #fff;
    box-shadow: var(--aoi-shadow);

    color: var(--aoi-text);
    text-decoration: none;

    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease,
        border-color 0.2s ease;
}


.aoi-related-card:hover {
    transform: translateY(-3px);

    border-color: #a9cfe3;

    box-shadow: var(--aoi-shadow-hover);

    color: var(--aoi-text);
    text-decoration: none;
}


.aoi-related-card h3 {
    margin-bottom: 0.6rem;
    font-size: 1.08rem;
}


.aoi-related-card p {
    margin-bottom: 0;
    line-height: 1.6;
}


.aoi-related-icon {
    display: flex;
    align-items: center;
    justify-content: center;

    width: 46px;
    height: 46px;

    margin-bottom: 1rem;

    border-radius: 12px;

    background: var(--aoi-blue-light);
    color: var(--aoi-blue);

    font-size: 1.1rem;
}



/* =========================================================
   SUBTLE CARD HOVERS
   ========================================================= */

.aoi-comparison-card,
.aoi-method-card,
.aoi-radius-card,
.aoi-shell-card,
.aoi-motion-card,
.aoi-method-choice-card,
.aoi-mistake-card,
.aoi-reference-card {
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease;
}


.aoi-comparison-card:hover,
.aoi-method-card:hover,
.aoi-radius-card:hover,
.aoi-shell-card:hover,
.aoi-motion-card:hover,
.aoi-method-choice-card:hover,
.aoi-mistake-card:hover,
.aoi-reference-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--aoi-shadow-hover);
}



/* =========================================================
   MATHJAX / OVERFLOW
   ========================================================= */

.aoi-formula-card,
.aoi-definition-large-card,
.aoi-example-card,
.aoi-memory-card,
.aoi-ftc-card,
.aoi-reference-card,
.aoi-comparison-card,
.aoi-method-card,
.aoi-radius-card,
.aoi-motion-card {
    overflow-x: auto;
}


#applications-of-integrals-guide mjx-container[display="true"] {
    margin: 1rem 0 !important;
}



/* =========================================================
   TABLET
   ========================================================= */

@media (max-width: 991.98px) {

    .aoi-section {
        margin-top: 4.5rem;
    }


    .aoi-practice-cta {
        align-items: flex-start;
        flex-direction: column;
    }


    .aoi-practice-cta .btn {
        width: 100%;
    }


    .aoi-units-example {
        flex-wrap: wrap;
    }

}



/* =========================================================
   MOBILE
   ========================================================= */

@media (max-width: 767.98px) {

    #applications-of-integrals-guide {
        font-size: 0.98rem;
    }


    .aoi-section {
        margin-top: 4rem;
    }


    .aoi-section-heading {
        margin-bottom: 1.5rem;
    }


    .aoi-section-heading h2,
    .aoi-intro h2,
    .aoi-final-card h2,
    .aoi-practice-cta h2,
    .aoi-related-section > h2 {
        font-size: 1.65rem;
    }


    .aoi-definition-card {
        align-items: flex-start;
        flex-direction: column;

        padding: 1.5rem;
    }


    .aoi-definition-icon {
        flex-basis: 50px;

        width: 50px;
        height: 50px;
    }


    .aoi-comparison-grid,
    .aoi-method-grid,
    .aoi-radius-grid,
    .aoi-shell-grid,
    .aoi-motion-grid,
    .aoi-method-choice-grid,
    .aoi-mistake-grid,
    .aoi-reference-grid,
    .aoi-related-grid,
    .aoi-final-list {
        grid-template-columns: 1fr;
    }


    .aoi-example-card,
    .aoi-idea-card,
    .aoi-warning-card,
    .aoi-final-card,
    .aoi-practice-cta,
    .aoi-units-card {
        padding: 1.5rem;
    }


    .aoi-formula-card,
    .aoi-definition-large-card {
        padding: 1.5rem 1rem;
    }


    .aoi-mistake-card {
        min-height: 0;
    }


    .aoi-roadmap-step {
        align-items: flex-start;

        padding: 1.35rem;
    }


    .aoi-roadmap-number {
        flex-basis: 42px;

        width: 42px;
        height: 42px;
    }


    .aoi-units-example {
        flex-direction: column;
    }


    .aoi-units-example svg {
        transform: rotate(90deg);
    }


    .aoi-units-example span {
        width: 100%;
        text-align: center;
    }


    .aoi-final-list {
        display: block;
    }


    .aoi-final-list li {
        margin-bottom: 0.8rem;
    }

}



/* =========================================================
   SMALL MOBILE
   ========================================================= */

@media (max-width: 575.98px) {

    .aoi-section {
        margin-top: 3.5rem;
    }


    .aoi-section-heading h2,
    .aoi-intro h2,
    .aoi-final-card h2,
    .aoi-practice-cta h2,
    .aoi-related-section > h2 {
        font-size: 1.5rem;
    }


    .aoi-example-card,
    .aoi-idea-card,
    .aoi-warning-card,
    .aoi-tip-card,
    .aoi-final-card,
    .aoi-practice-cta,
    .aoi-units-card {
        border-radius: 14px;
    }


    .aoi-idea-heading,
    .aoi-warning-heading {
        align-items: flex-start;
    }


    .aoi-idea-icon,
    .aoi-warning-icon {
        flex-basis: 42px;

        width: 42px;
        height: 42px;
    }


    .aoi-tip-card {
        flex-direction: column;
    }


    .aoi-mistake-card {
        padding:
            4.4rem
            1.35rem
            1.35rem;
    }


    .aoi-mistake-number {
        top: 1.2rem;
        left: 1.3rem;
    }


    .aoi-roadmap-step {
        gap: 1rem;
    }


    .aoi-reference-card {
        min-height: 130px;
    }


    #applications-of-integrals-guide mjx-container {
        font-size: 95% !important;
    }

}

/* =========================================================
   GUIDE CONTACT CTA COLOR FIX
   ========================================================= */

#applications-of-integrals-guide #guideContactCtaTitle {
    color: #ffffff !important;
}

#applications-of-integrals-guide #guideContactCtaTitle ~ p {
    color: rgba(255, 255, 255, 0.78) !important;
}

#applications-of-integrals-guide
    .text-uppercase-expanded {
    color: inherit;
}

/* =========================================================
   APPLICATION VISUALS
   ========================================================= */

.aoi-visual-card {
    padding: 1.5rem;

    border: 1px solid var(--aoi-border);
    border-radius: 16px;

    background: #fff;

    box-shadow: var(--aoi-shadow);
}

.aoi-visual-heading {
    margin-bottom: 1.25rem;
}

.aoi-visual-heading p:last-child {
    color: var(--aoi-text);
    line-height: 1.6;
}

.aoi-graph {
    width: 100%;
    height: 420px;

    border: 1px solid var(--aoi-border);
    border-radius: 12px;

    background: #fff;
}

.aoi-visual-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem 1.5rem;

    margin-top: 1rem;
}

.aoi-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;

    color: var(--aoi-text);

    font-size: 0.9rem;
    font-weight: 600;
}

.aoi-legend-swatch {
    display: inline-block;

    width: 18px;
    height: 18px;

    border-radius: 4px;
}

.aoi-positive-swatch {
    background: rgba(21, 154, 156, 0.28);
}

.aoi-negative-swatch {
    background: rgba(184, 74, 74, 0.25);
}

.aoi-visual-formula {
    margin-top: 1rem;

    padding: 0.8rem 1rem;

    border-radius: 10px;

    background: var(--aoi-soft);

    text-align: center;
}


@media (max-width: 767.98px) {

    .aoi-graph {
        height: 340px;
    }

    .aoi-visual-card {
        padding: 1rem;
    }

}


@media (max-width: 575.98px) {

    .aoi-graph {
        height: 300px;
    }

}