/* ==========================================================
   Reference Section - Structure
   1) Local Tokens
   2) Shared Dark Sections Shell
   3) Reference Content
   4) Responsive
   ========================================================== */

/* ==========================================================
   Local Tokens
   ========================================================== */
#reference {
    /* Local tokens - logo grid geometry */
    --reference-logo-max-width: 120px;
    --reference-logo-max-height: 70px;
    --reference-logo-gap-x: clamp(16px, 4vw, 60px);
    --reference-logo-gap-y: 40px;

    /* Local tokens - section top offset */
    --reference-content-offset-y-desktop: 150px;
    --reference-content-offset-y-mobile: 40px;
    --reference-content-offset-y: var(--reference-content-offset-y-desktop);
}

/* ==========================================================
   Shared Dark Sections Shell
   ========================================================== */
#expertise,
#reference,
#numbers,
#contact {
    position: relative;
    left: 50%;
    width: calc(100dvw - (2 * var(--dark-block-margin)));
    margin-inline: 0;
    transform: translateX(-50%);
    background-color: var(--bg-dark);
    color: var(--text-on-dark);
}

#expertise {
    border-top-left-radius: var(--dark-block-radius);
    border-top-right-radius: var(--dark-block-radius);
}

#reference {
    padding-top: var(--reference-content-offset-y);
}

#contact {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

#numbers {
    padding-top: var(--numbers-content-offset-y);
}

.site-main > #expertise.section-spacing + #reference.section-spacing,
.site-main > #reference.section-spacing + #numbers.section-spacing,
.site-main > #numbers.section-spacing + #contact.section-spacing {
    margin-top: 0;
}

#expertise .expertise-title,
#reference .reference-title {
    color: var(--text-on-dark);
}

#expertise .expertise-copy,
#reference .reference-subtitle {
    color: var(--text-grey);
}

#reference .reference-logo {
    filter: invert(1);
}

body .site-footer-copy {
    color: var(--text-grey);
    opacity: 1;
}

/* ==========================================================
   Reference Content
   ========================================================== */
.reference-header {
    max-width: 1200px;
    margin-inline: auto;
    text-align: center;
    margin-bottom: 60px;
}

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

.reference-subtitle {
    font-size: var(--body-size);
    line-height: 1.5;
    font-weight: 400;
}

.reference-rows {
    display: grid;
    width: min(100%, 1300px);
    margin-inline: auto;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    justify-items: center;
    align-items: center;
    gap: var(--reference-logo-gap-y) var(--reference-logo-gap-x);
}

.reference-rows[data-animate] {
    --reference-enter-y: 24px;
    --reference-enter-blur: 6px;
    --reference-enter-scale-start: 0.92;
}

.reference-item {
    min-width: 0;
    width: min(100%, var(--reference-logo-max-width));
    height: var(--reference-logo-max-height);
    display: grid;
    place-items: center;
}

.reference-logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0.6;
    transition: opacity 700ms ease-in-out;
}

.reference-item.is-random-highlight .reference-logo {
    opacity: 0.9;
}

.reference-item:hover .reference-logo,
.reference-item:focus-within .reference-logo {
    opacity: 0.95;
    transition-duration: 180ms;
    transition-timing-function: ease-out;
}

.reference-rows[data-animate] .reference-item {
    --reference-item-progress: 0;
    opacity: var(--reference-item-progress);
    transform: translate3d(0, calc(var(--reference-enter-y) * (1 - var(--reference-item-progress))), 0)
        scale(calc(var(--reference-enter-scale-start) + ((1 - var(--reference-enter-scale-start)) * var(--reference-item-progress))));
    filter: blur(calc(var(--reference-enter-blur) * (1 - var(--reference-item-progress))));
    will-change: transform, opacity, filter;
    transition: none;
}

@media (prefers-reduced-motion: reduce) {
    .reference-rows[data-animate] .reference-item {
        opacity: 1;
        transform: none;
        filter: none;
    }
}

/* ==========================================================
   Responsive
   ========================================================== */
@media (max-width: 1024px) {
    .reference-header {
        text-align: left;
        margin-inline: 0;
    }

    .reference-rows {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 36px 28px;
    }
}

@media (max-width: 640px) {
    #expertise,
    #reference,
    #numbers,
    #contact {
        left: 0;
        width: 100dvw;
        transform: none;
        margin-inline: 0;
        border-radius: 0;
    }

    .reference-header {
        text-align: center;
        margin-inline: auto;
    }

    .reference-subtitle {
        text-align: center;
    }

    #reference {
        /* Mobile local overrides - compact logo grid */
        --reference-content-offset-y: var(--reference-content-offset-y-mobile);
        --reference-logo-max-width: 105px;
        --reference-logo-max-height: 60px;
        --reference-logo-gap-y: 30px;
    }

    .reference-title {
        font-size: var(--title-size);
        line-height: 1.04;
        overflow-wrap: normal;
        word-break: normal;
        text-wrap: balance;
    }

    .reference-rows {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 28px 18px;
    }
}