/* ===================================================================
   CASE STUDIES — REDESIGN
   Concept: each project reads like a real job ticket / work order —
   ref number, category, site photo, then a Challenge → Solution →
   Result flow connected by a dashed "duct run" line with airflow
   direction, echoing the ventilation work itself.
   =================================================================== */

.oxycs-section {
    background: var(--res-wash, #f8f4f1);
}

/* ---------- Filters ---------- */
.oxycs-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin: 0 0 46px;
}

.oxycs-filter {
    font-family: 'Heebo', sans-serif;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .3px;
    padding: 10px 20px;
    border-radius: 999px;
    border: 1px solid var(--res-line, #e8dfda);
    background: #fff;
    color: var(--res-muted, #746967);
    cursor: pointer;
    transition: background-color .2s ease, color .2s ease, border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.oxycs-filter:hover {
    border: 1px solid var(--res-brand, #90594E);
    color: var(--res-brand, #90594E);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(71, 47, 41, .1);
}

.oxycs-filter.is-active {
    background: var(--res-brand, #90594E);
    border-color: var(--res-brand, #90594E);
    color: #fff;
}

.oxycs-filter:focus-visible {
    outline: 2px solid var(--res-brand, #90594E);
    outline-offset: 2px;
}

/* ---------- Grid ---------- */
.oxycs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

/* ---------- Card ---------- */
.oxycs-card {
    background: #fff;
    border: 1px solid var(--res-line, #e8dfda);
    border-radius: 6px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform .3s ease, box-shadow .3s ease;
}

.oxycs-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(71, 47, 41, .12);
}

.oxycs-card.is-hidden {
    display: none;
}

.oxycs-media {
    position: relative;
    height: 200px;
    overflow: hidden;
    background: #eee;
}

.oxycs-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .6s ease;
}

.oxycs-card:hover .oxycs-media img {
    transform: scale(1.07);
}

.oxycs-meta-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px 0;
}

.oxycs-ref {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 500;
    letter-spacing: .5px;
    color: var(--res-muted, #746967);
}

.oxycs-tag {
    background: #f2e5e1;
    color: var(--res-brand, #90594E);
    font-size: 10.5px;
    font-weight: 800;
    letter-spacing: .6px;
    text-transform: uppercase;
    padding: 5px 10px;
    border-radius: 4px;
}

.oxycs-body {
    padding: 14px 24px 26px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.oxycs-body h3 {
    font-family: 'Heebo', sans-serif;
    font-size: 19px;
    font-weight: 700;
    line-height: 1.32;
    color: var(--res-ink, #231d1b);
    margin: 0 0 8px;
}

.oxycs-place {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--res-brand, #90594E);
    font-size: 12.5px;
    font-weight: 700;
    letter-spacing: .2px;
    margin-bottom: 22px;
}

.oxycs-place i {
    font-size: 11px;
}

/* ---------- Flow: Challenge -> Solution -> Result ---------- */
.oxycs-flow {
    display: flex;
    flex-direction: column;
}

.oxycs-step {
    position: relative;
    padding-left: 22px;
    padding-bottom: 20px;
}

.oxycs-step::before {
    content: '';
    position: absolute;
    left: 4px;
    top: 3px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--res-brand, #90594E);
    box-shadow: 0 0 0 3px #f2e5e1;
}

.oxycs-step::after {
    content: '';
    position: absolute;
    left: 8px;
    top: 16px;
    bottom: 0;
    width: 1px;
    background-image: repeating-linear-gradient(to bottom, #ddcfca 0 4px, transparent 4px 9px);
}

.oxycs-step:last-child {
    padding-bottom: 0;
}

.oxycs-step:last-child::after {
    display: none;
}

.oxycs-step-label {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 1.2px;
    text-transform: uppercase;
    color: var(--res-brand, #90594E);
    margin-bottom: 5px;
}

.oxycs-step p {
    margin: 0;
    color: #645956;
    font-size: 14px;
    line-height: 1.62;
}

.oxycs-step--result::before {
    background: var(--res-ink, #231d1b);
    box-shadow: 0 0 0 3px #eae4e2;
}

.oxycs-step--result .oxycs-step-label {
    color: var(--res-ink, #231d1b);
}

.oxycs-step--result p {
    color: var(--res-ink, #231d1b);
    font-weight: 500;
}

/* ---------- CTA ---------- */
.oxycs-cta {
    margin-top: 60px;
    padding: 50px 40px;
    border-radius: 8px;
    background: var(--thm-base, #915A4F);
    text-align: center;
}

.oxycs-cta h3 {
    font-family: 'Heebo', sans-serif;
    font-weight: 700;
    color: #fff;
    font-size: clamp(24px, 3vw, 32px);
    margin: 0 0 10px;
    letter-spacing: -.5px;
}

.oxycs-cta p {
    color: #f6e9e5;
    font-size: 15px;
    margin: 0 0 28px;
}

.oxycs-cta-actions {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

.oxycs-cta-call {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 14px 26px;
    border-radius: 4px;
    background: #fff;
    border: 1px solid #fff;
    color: var(--thm-base, #915A4F);
    font-weight: 800;
    font-size: 14px;
    text-decoration: none;
    transition: transform .25s ease, box-shadow .25s ease, background-color .25s ease, border-color .25s ease;
}

.oxycs-cta-call:hover {
    background: #f3e5e0;
    border: 1px solid #f3e5e0;
    color: var(--thm-base, #915A4F);
    transform: translateY(-3px);
    box-shadow: 0 14px 26px rgba(20, 12, 10, .28);
}

.oxycs-cta-call:active {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(20, 12, 10, .24);
}

.oxycs-cta-call:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 3px;
}

.oxycs-cta-secondary {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 14px 26px;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, .55);
    background: transparent;
    color: #fff;
    font-weight: 700;
    font-size: 14px;
    text-decoration: none;
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease, background-color .25s ease;
}

.oxycs-cta-secondary:hover {
    border: 1px solid #fff;
    background: rgba(255, 255, 255, .14);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 14px 26px rgba(20, 12, 10, .22);
}

.oxycs-cta-secondary:active {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(20, 12, 10, .18);
}

.oxycs-cta-secondary:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 3px;
}

/* ---------- Responsive ---------- */
@media(max-width:991px) {
    .oxycs-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media(max-width:767px) {
    .oxycs-grid {
        grid-template-columns: 1fr;
    }

    .oxycs-filters {
        gap: 8px;
    }

    .oxycs-cta {
        padding: 38px 22px;
    }

    .oxycs-cta-actions {
        flex-direction: column;
        align-items: stretch;
    }
}

@media (prefers-reduced-motion: reduce) {

    .oxycs-card,
    .oxycs-media img,
    .oxycs-filter,
    .oxycs-cta-call,
    .oxycs-cta-secondary {
        transition: none !important;
    }
}