/* ==========================================================
   Expertise Section - Structure
   1) Local Tokens
   2) Section Shell + Intro
   3) Accordion Items
   4) Expanded Body
   5) Motion Helpers
   6) Responsive
   ========================================================== */

/* ==========================================================
   Local Tokens
   ========================================================== */
#expertise {
    /* Local tokens - layout + vertical offset */
    --expertise-item-gap: 12px;
    --expertise-body-text-max-width: 750px;
    --expertise-content-offset-y-desktop: 150px;
    --expertise-content-offset-y-mobile: 40px;
    --expertise-content-offset-y: var(--expertise-content-offset-y-desktop);

    /* Local tokens - card visuals */
    --expertise-card-radius: 18px;
    --expertise-card-bg: var(--bg-light);
    --expertise-card-hover-bg: var(--grey);
}

/* ==========================================================
   Section Shell + Intro
   ========================================================== */
#expertise {
    width: 100vw;
    margin-inline: calc(50% - 50vw);
    background-color: var(--bg-light);
}

.expertise-panel {
    width: min(100%, var(--page-max-width));
    margin-inline: auto;
    padding-block: clamp(34px, 5vw, 72px);
    padding-inline: var(--page-gutter);
}

.expertise-grid {
    display: grid;
    grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1.45fr);
    gap: clamp(28px, 5vw, 88px);
    align-items: start;
    margin-top: var(--expertise-content-offset-y);
}

.expertise-intro {
    max-width: 400px;
}

.expertise-title {
    margin-bottom: var(--title-text-space);
    font-size: var(--title-size);
    line-height: 1;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.expertise-copy {
    font-size: var(--body-size);
    line-height: var(--body-leading);
    font-weight: 400;
    text-wrap: pretty;
    color: var(--text-grey);
    opacity: 1;
}

.expertise-list {
    display: grid;
    gap: 0;
}

.expertise-entry {
    display: grid;
    gap: 0;
    margin-bottom: var(--expertise-item-gap);
    border-radius: var(--expertise-card-radius);
    background-color: var(--expertise-card-bg);
    overflow: hidden;
}

.expertise-entry:last-child {
    margin-bottom: 0;
}

.expertise-list[data-animate] {
    --expertise-enter-x: 110vw;
    --expertise-enter-blur: 8px;
    --expertise-enter-scale-start: 0.965;
}

/* ==========================================================
   Accordion Items
   ========================================================== */
.expertise-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    width: 100%;
    min-height: 100px;
    padding: 18px 50px;
    border: 0;
    border-radius: 0;
    background-color: var(--expertise-card-bg);
    color: var(--text-on-light);
    font: inherit;
    text-align: left;
    cursor: pointer;
    box-shadow: none;
    transition: background-color 220ms ease, border-radius 280ms ease;
}

.expertise-item:focus-visible {
    background-color: var(--expertise-card-hover-bg);
    outline: none;
}

@media (hover: hover) and (pointer: fine) {
    .expertise-item:hover {
        background-color: var(--expertise-card-hover-bg);
    }
}

.expertise-item-label {
    font-size: 27px;
    font-weight: 500;
    line-height: 1.25;
    transition: font-weight 260ms ease, font-size 260ms ease, letter-spacing 260ms ease;
}

.expertise-item-icon {
    position: relative;
    width: 28px;
    height: 28px;
    margin-left: 20px;
    transition: transform 260ms ease;
}

.expertise-item-icon::before,
.expertise-item-icon::after {
    content: "";
    position: absolute;
    inset: 50% auto auto 50%;
    width: 22px;
    height: 4px;
    background-color: currentColor;
    border-radius: 999px;
    transform: translate(-50%, -50%);
    transition: transform 260ms ease, opacity 260ms ease, height 260ms ease;
}

.expertise-item-icon::after {
    transform: translate(-50%, -50%) rotate(90deg);
}

.expertise-entry.is-open .expertise-item {
    background-color: var(--expertise-card-bg);
    box-shadow: none;
}

.expertise-entry.is-closing .expertise-item,
.expertise-entry.is-closing .expertise-item:hover,
.expertise-entry.is-closing .expertise-item:focus-visible {
    background-color: var(--expertise-card-bg);
    pointer-events: none;
}

.expertise-entry.is-open .expertise-item-icon {
    transform: rotate(45deg) scale(1.25);
}

.expertise-entry.is-open .expertise-item-icon::before,
.expertise-entry.is-open .expertise-item-icon::after {
    height: 4px;
}

@media (min-width: 641px) {
    .expertise-entry.is-open .expertise-item-label {
        font-weight: 700;
        font-size: 29px;
        text-transform: uppercase;
        letter-spacing: 0.01em;
    }
}

/* ==========================================================
   Expanded Body
   ========================================================== */
.expertise-body {
    background-color: transparent;
    border-radius: 0;
    margin-top: 0;
    box-shadow: none;
    height: 0;
    opacity: 0;
    overflow: hidden;
    will-change: height, opacity;
    transition: height 560ms cubic-bezier(0.22, 1, 0.36, 1), opacity 320ms ease;
}

.expertise-body[hidden] {
    display: none;
}

.expertise-entry.is-open .expertise-body {
    opacity: 1;
}

.expertise-body-inner {
    display: grid;
    gap: 25px;
    padding: 0 50px 34px;
    opacity: 0;
    transform: translate3d(0, -10px, 0);
    transition: transform 560ms cubic-bezier(0.22, 1, 0.36, 1), opacity 360ms ease;
}

.expertise-entry.is-open .expertise-body-inner {
    opacity: 1;
    transform: translate3d(0, 0, 0);
}

.expertise-body-copy {
    max-width: var(--expertise-body-text-max-width);
    font-size: 18px;
    line-height: 1.5;
    font-weight: 500;
    letter-spacing: -0.02em;
    color: var(--text-on-light);
}

.expertise-body-sections {
    display: grid;
    gap: 28px;
    max-width: var(--expertise-body-text-max-width);
}

.expertise-body-section {
    display: grid;
    gap: 10px;
    padding: 0;
    border: 0;
    border-radius: 0;
    background-color: transparent;
}

.expertise-body-section-title {
    margin: 0;
    font-size: 20px;
    line-height: 1.0;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-on-dark);
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 10px 16px;
    border: 0;
    border-radius: 999px;
    background-color: var(--bg-dark);
}

.expertise-body-section-copy {
    margin: 0;
    font-size: 18px;
    line-height: 1.5;
    font-weight: 400;
    font-style: normal;
    display: inline-block;
    transform: skewX(-4deg);
    transform-origin: left center;
    color: var(--text-grey);
}

/* ==========================================================
   Motion Helpers
   ========================================================== */
.expertise-list[data-animate] .expertise-entry {
    --expertise-item-progress: 0;
    opacity: var(--expertise-item-progress);
    transform: translate3d(calc(var(--expertise-enter-x) * (1 - var(--expertise-item-progress))), 0, 0)
        scale(calc(var(--expertise-enter-scale-start) + ((1 - var(--expertise-enter-scale-start)) * var(--expertise-item-progress))));
    filter: blur(calc(var(--expertise-enter-blur) * (1 - var(--expertise-item-progress))));
    will-change: transform, opacity, filter;
    transition: none;
}

.expertise-list[data-animate] .expertise-entry.is-open {
    will-change: auto;
}

@media (prefers-reduced-motion: reduce) {
    .expertise-list[data-animate] .expertise-entry {
        opacity: 1;
        transform: none;
        filter: none;
        transition: none;
    }
}

/* ==========================================================
   Responsive
   ========================================================== */
@media (max-width: 1024px) {
    .expertise-grid {
        grid-template-columns: minmax(0, 1fr);
        gap: 36px;
    }

    .expertise-intro,
    .expertise-body-copy,
    .expertise-body-sections {
        max-width: 100%;
    }
}

@media (max-width: 640px) {
    #expertise {
        /* Mobile local override - reduce top offset */
        --expertise-content-offset-y: var(--expertise-content-offset-y-mobile);
    }

    .expertise-panel {
        padding-block: 28px;
    }

    .expertise-intro {
        max-width: 100%;
        margin-inline: auto;
        text-align: center;
    }

    .expertise-title {
        line-height: 1;
        text-align: center;
    }

    .expertise-copy {
        text-align: center;
    }

    .expertise-item {
        min-height: 64px;
        padding: 16px 18px;
        border-radius: 16px;
    }

    .expertise-item-label {
        font-size: 1rem;
    }

    .expertise-item-icon {
        margin-left: 16px;
        width: 22px;
        height: 22px;
    }

    .expertise-item-icon::before,
    .expertise-item-icon::after {
        width: 16px;
    }

    .expertise-body {
        border-bottom-left-radius: 16px;
        border-bottom-right-radius: 16px;
    }

    .expertise-body-inner {
        gap: 24px;
        padding: 0 18px 20px;
    }

    .expertise-body-copy {
        font-size: var(--body-size);
        line-height: var(--body-leading);
        text-align: center;
    }

    .expertise-body-sections {
        gap: 20px;
    }

    .expertise-body-section {
        padding: 0;
        border-radius: 0;
        justify-items: center;
    }

    .expertise-body-section-title {
        font-size: var(--body-size);
        line-height: var(--body-leading);
        padding: 8px 12px;
        justify-content: center;
        text-align: center;
        justify-self: center;
        margin-inline: auto;
    }

    .expertise-body-section-copy {
        font-size: var(--body-size);
        line-height: var(--body-leading);
        text-align: center;
    }
}