/* ===========================================
   CASE STUDY PAGES
   =========================================== */

.case-hero {
    min-height: 60vh;
    display: flex;
    align-items: flex-end;
    padding: 6rem 2rem 4rem;
}

.case-hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.case-back {
    font-size: 0.8rem;
    color: var(--text-muted);
    transition: color 0.3s;
    display: inline-block;
    margin-bottom: 2rem;
    cursor: none;
}
.case-back:hover { color: var(--text); }

.case-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(3rem, 8vw, 7rem);
    font-weight: 700;
    line-height: 0.95;
    letter-spacing: -0.03em;
}

.case-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: 1.5rem;
    max-width: 500px;
    line-height: 1.6;
}

/* Meta Grid */
.case-meta {
    padding: 3rem 2rem;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.case-meta-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.meta-label {
    display: block;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.meta-value {
    font-size: 0.9rem;
    color: var(--text);
}

/* Sections */
.case-section {
    padding: 4rem 2rem;
}

.case-content {
    max-width: 700px;
    margin: 0 auto;
}

.case-heading {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.case-text {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    font-weight: 300;
}

/* Image Layouts */
.case-img-full {
    max-width: 1000px;
    margin: 0 auto;
}

.case-img-duo {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.case-img-trio {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.case-img-full img,
.case-img-duo img,
.case-img-trio img {
    width: 100%;
    display: block;
}

/* Placeholder for missing images */
.img-placeholder {
    aspect-ratio: 16 / 10;
    border: 2px dashed var(--border);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--text-muted);
    background: var(--surface);
    transition: border-color 0.3s, background 0.3s;
}

.img-placeholder span {
    font-size: 0.85rem;
    font-weight: 500;
}

.img-placeholder small {
    font-size: 0.7rem;
    opacity: 0.5;
}

/* Process Steps */
.case-steps {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    margin-top: 2rem;
}

.case-step {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--border);
}

.case-step:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.step-num {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-muted);
    min-width: 3rem;
    line-height: 1;
}

.step-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

/* Next Case */
.case-next {
    padding: 6rem 2rem;
    text-align: center;
    border-top: 1px solid var(--border);
}

.case-next-label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.case-next-link {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    cursor: none;
    transition: gap 0.3s;
}

.case-next-link:hover { gap: 2rem; }

.case-next-name {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
}

.case-next-arrow {
    font-size: 2rem;
    color: var(--text-secondary);
    transition: transform 0.3s;
}

.case-next-link:hover .case-next-arrow {
    transform: translateX(8px);
}

/* Back to top */
.back-to-top {
    position: fixed;
    top: 5rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: color-mix(in srgb, var(--bg) 70%, transparent);
    backdrop-filter: blur(20px) saturate(140%);
    -webkit-backdrop-filter: blur(20px) saturate(140%);
    border: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    cursor: none;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity 0.35s ease, transform 0.35s ease, background 0.3s, border-color 0.3s;
    z-index: 99;
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.back-to-top:hover {
    background: color-mix(in srgb, var(--bg) 90%, transparent);
    border-color: var(--text);
    transform: translateY(-2px);
}

.back-to-top svg {
    width: 16px;
    height: 16px;
}

/* Responsive */
@media (max-width: 768px) {
    .case-hero { min-height: 50vh; padding: 6rem 1.5rem 3rem; }
    .case-meta-grid { grid-template-columns: repeat(2, 1fr); }
    .case-section { padding: 3rem 1.5rem; }
    .case-img-duo { grid-template-columns: 1fr; }
    .case-img-trio { grid-template-columns: 1fr; }
    .case-step { flex-direction: column; gap: 1rem; }
    .step-num { font-size: 1.5rem; }
    .back-to-top { top: 4.5rem; right: 1rem; width: 40px; height: 40px; }
}

/* Card surface — neutral dark grey in dark mode (overrides per-case translucent surface) */
[data-theme="dark"] .case-grid > .case-section {
    background: #181818;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}