/* Case studies reuse the brand tokens, typography, container and buttons in main.css. */
.cases-preview,
.cases-section {
    padding: clamp(3.5rem, 7vw, 7rem) 0;
}

.cases-preview,
.cases-tinted {
    background: var(--gray);
}

.cases-preview .section-header,
.cases-page .section-header {
    margin-bottom: 2.5rem;
}

.case-preview-grid,
.case-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
    align-items: start;
}

.case-preview-grid {
    align-items: stretch;
    margin-bottom: 3rem;
}

.case-grid {
    grid-template-columns: minmax(0, 1fr);
}

.case-preview,
.case-card {
    display: flex;
    flex-direction: column;
    padding: clamp(1.5rem, 3vw, 2.5rem);
    background: var(--white);
    border: 1px solid var(--lavender);
    border-top: 3px solid var(--purple);
}

.case-preview h3 {
    font-size: clamp(1.4rem, 2vw, 1.8rem);
    color: var(--purple);
    margin-bottom: 1rem;
}

.case-preview > p {
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.case-link {
    display: inline-block;
    width: fit-content;
    color: var(--purple);
    font-weight: 700;
    line-height: 1.5;
    padding: 0.4rem 0;
    border-bottom: 2px solid var(--orange);
}

.case-preview .case-link {
    margin-top: auto;
}

.case-link span[aria-hidden] {
    margin-left: 0.5rem;
}

.case-link:hover {
    border-color: var(--purple);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

.cases-hero {
    padding: clamp(9rem, 15vw, 13rem) 0 4rem;
    background: var(--gray);
}

.cases-hero h1 {
    color: var(--purple);
    font-size: clamp(2.3rem, 5.2vw, 4.8rem);
    line-height: 1.15;
    max-width: 1050px;
    letter-spacing: -0.035em;
}

.cases-intro {
    max-width: 760px;
    font-size: 1.15rem;
    line-height: 1.8;
    margin-top: 2rem;
}

.case-index {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 2rem;
    margin-top: 2.5rem;
    border-top: 1px solid var(--lavender);
    padding-top: 1.5rem;
}

.case-index a {
    padding: 0.6rem 0;
    color: var(--purple);
    font-weight: 500;
    text-decoration: underline;
    text-underline-offset: 0.3em;
}

.cases-page :is(section[id], article[id]) {
    scroll-margin-top: 120px;
}

.case-card {
    padding: 2rem;
    min-height: 0;
}

.cases-page .section-header h2 {
    font-size: 2rem;
    line-height: 1.25;
}

.case-grid > .case-card:only-child {
    grid-column: 1 / -1;
    min-height: 0;
}

.case-label {
    font-family: 'Fira Mono', monospace;
    font-size: 0.75rem;
    line-height: 1.7;
    color: var(--purple);
    margin-bottom: 0.75rem;
}

.case-card h3 {
    color: var(--purple);
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.35;
}

.case-card-brief {
    font-size: 1rem;
    line-height: 1.65;
    max-width: 70ch;
    margin: 1rem 0 1.5rem;
}

.case-card-metric {
    margin-bottom: 1.5rem;
}

.case-card-metric strong {
    display: block;
    font-family: 'Poppins', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--dark);
}

.case-card-metric span {
    display: block;
    font-size: 0.9rem;
    line-height: 1.6;
    margin-top: 0.3rem;
}

.case-details {
    margin-top: 0;
}

.case-details > summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 0;
    border-top: 1px solid var(--lavender);
    color: var(--purple);
    font-weight: 700;
    cursor: pointer;
    list-style: none;
}

.case-details > summary::-webkit-details-marker {
    display: none;
}

.case-details > summary:hover {
    text-decoration: underline;
    text-underline-offset: 0.3em;
}

.case-details > summary:focus-visible {
    outline: 3px solid var(--purple);
    outline-offset: 4px;
}

.case-toggle-icon {
    position: relative;
    flex: 0 0 1.25rem;
    width: 1.25rem;
    height: 1.25rem;
}

.case-toggle-icon::before,
.case-toggle-icon::after {
    content: '';
    position: absolute;
    background: currentColor;
}

.case-toggle-icon::before {
    width: 100%;
    height: 2px;
    left: 0;
    top: calc(50% - 1px);
}

.case-toggle-icon::after {
    width: 2px;
    height: 100%;
    top: 0;
    left: calc(50% - 1px);
}

.case-when-open,
.case-details[open] .case-when-closed,
.case-details[open] .case-toggle-icon::after {
    display: none;
}

.case-details[open] .case-when-open {
    display: inline;
}

.case-detail-body {
    max-width: 75ch;
    padding-top: 0.5rem;
}

.case-detail-body > p,
.case-detail-body > ul {
    line-height: 1.8;
    margin-bottom: 1rem;
}

.case-detail-body h4 {
    font-family: 'Poppins', sans-serif;
    color: var(--purple);
    font-size: 1rem;
    line-height: 1.5;
    margin: 1.5rem 0 0.75rem;
}

.case-detail-body ul {
    padding-left: 1.2rem;
}

.case-detail-body li {
    padding: 0.3rem 0 0.3rem 0.3rem;
}

.case-detail-body li::marker {
    color: var(--purple);
}

.case-detail-metrics {
    display: grid;
    gap: 1rem;
    margin: 1.5rem 0;
    padding: 1.5rem;
    background: var(--gray);
}

.case-detail-metrics > div {
    display: flex;
    flex-direction: column-reverse;
    gap: 0.3rem;
}

.case-detail-metrics dt {
    font-size: 0.9rem;
    line-height: 1.6;
}

.case-detail-metrics dt span {
    display: block;
    font-size: 0.85rem;
}

.case-detail-metrics dd {
    color: var(--dark);
    font-family: 'Poppins', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
}

.case-card-research {
    border-top-style: dashed;
}

.case-status {
    align-self: flex-start;
    background: var(--gray);
    border-left: 3px solid var(--purple);
    padding: 0.5rem 0.75rem;
    color: var(--purple);
    font-size: 0.8rem;
    font-weight: 700;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.case-research-note {
    font-size: 0.9rem;
    color: var(--purple);
}

.cases-contact {
    padding: clamp(3.5rem, 6vw, 6rem) 0;
    background: var(--gray);
}

.cases-contact .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.cases-contact h2 {
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    color: var(--purple);
    max-width: 680px;
}

.cases-contact p {
    line-height: 1.8;
    margin-top: 1.5rem;
    max-width: 620px;
}

.cases-contact .btn-primary {
    flex-shrink: 0;
}

.cases-preview .btn-primary,
.cases-page .btn-primary {
    background: var(--purple);
    box-shadow: none;
    white-space: normal;
    text-align: center;
}

@media (max-width: 992px) {
    .cases-contact .container {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (max-width: 640px) {
    .case-preview-grid {
        grid-template-columns: 1fr;
    }

    .case-card {
        padding: 1.5rem;
    }

    .cases-page .section-header h2 {
        font-size: 1.75rem;
    }

    .cases-preview .section-header,
    .cases-page .section-header {
        margin-bottom: 2rem;
    }

    .case-index {
        flex-direction: column;
        gap: 0.25rem;
    }

    .cases-intro {
        font-size: 1.05rem;
    }
}


/* Accessibility is scoped to this page; home interactions stay in main.js. */
.case-study-page .skip-link {
    position: fixed;
    top: 1rem;
    left: 1rem;
    padding: 1rem;
    background: var(--white);
    color: var(--purple);
    z-index: 1100;
    transform: translateY(-200%);
}

.case-study-page .skip-link:focus {
    transform: translateY(0);
}

.case-study-page :is(a, button, summary):focus-visible {
    outline: 3px solid var(--purple);
    outline-offset: 4px;
}

.case-study-page footer a:focus-visible {
    outline-color: var(--yellow);
}

.case-study-page nav a[aria-current="page"] {
    color: var(--purple);
    text-decoration: underline;
    text-underline-offset: 0.4em;
}

@media (max-width: 1100px) {
    .case-study-page #navMenu:not(.active) {
        visibility: hidden;
    }

    .case-study-page #navMenu.active {
        visibility: visible;
    }
}

@media (prefers-reduced-motion: reduce) {
    .case-study-document {
        scroll-behavior: auto;
    }

    .case-study-page *,
    .case-study-page *::before,
    .case-study-page *::after {
        animation: none !important;
        transition: none !important;
    }
}