/* ═══════════════════════════════════════════════════════
   BERTINI & SALAS — Case Study Pages
   ═══════════════════════════════════════════════════════ */

/* ─── Case Study Hero ───────────────────────────────── */
.cs-hero {
    position: relative;
    padding: 10rem 0 4rem;
    background-color: var(--black);
    overflow: hidden;
}

.cs-hero__grain {
    position: absolute;
    inset: 0;
    z-index: 1;
    opacity: 0.04;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 200px 200px;
}

.cs-hero__video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
    opacity: 0.25;
    pointer-events: none;
}

@media (max-width: 768px) {
    .cs-hero__video {
        opacity: 0.12;
    }
}

.cs-hero__content {
    position: relative;
    z-index: 1;
}

.cs-hero__back {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--stone);
    margin-bottom: var(--space-lg);
    transition: color var(--duration-fast) ease;
}

.cs-hero__back:hover {
    color: var(--white);
}

.cs-hero__meta {
    display: flex;
    align-items: center;
    gap: 0.8em;
    margin-bottom: var(--space-md);
}

.cs-hero__year,
.cs-hero__type {
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--stone);
}

.cs-hero__divider {
    color: var(--graphite);
}

.cs-hero__title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 8vw, 7rem);
    font-weight: 300;
    line-height: 1.05;
    letter-spacing: -0.01em;
    color: var(--white);
    margin-bottom: var(--space-md);
}

.cs-hero__subtitle {
    font-family: var(--font-serif);
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    font-weight: 300;
    font-style: italic;
    color: var(--stone);
    margin-bottom: var(--space-lg);
}

.cs-hero__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

/* ─── Full Width Image ──────────────────────────────── */
.cs-image-full {
    padding: 0 0 var(--space-xl);
    background-color: var(--black);
}

.cs-image-full__wrap {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background-color: var(--charcoal);
}

.cs-image-full__img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ─── Section ───────────────────────────────────────── */
.cs-section {
    padding: var(--space-xl) 0;
    background-color: var(--black);
}

.cs-section--dark {
    background-color: var(--black-soft);
}

/* ─── Grid Layout ───────────────────────────────────── */
.cs-grid {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-lg);
    align-items: start;
}

@media (max-width: 1024px) {
    .cs-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
}

.cs-grid__label {
    padding-top: 0.3em;
}

/* ─── Typography ────────────────────────────────────── */
.cs-lead {
    font-family: var(--font-serif);
    font-size: clamp(1.3rem, 2.5vw, 2rem);
    font-weight: 300;
    line-height: 1.5;
    color: var(--ivory);
    max-width: 700px;
    margin-bottom: var(--space-md);
}

.cs-body {
    font-size: 1rem;
    font-weight: 300;
    line-height: 1.8;
    color: var(--ash);
    max-width: 600px;
}

/* ─── Scope ─────────────────────────────────────────── */
.cs-scope {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
}

@media (max-width: 768px) {
    .cs-scope {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
}

.cs-scope__heading {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--white);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--graphite);
}

.cs-scope__list {
    list-style: none;
    padding: 0;
}

.cs-scope__list li {
    font-size: 0.9rem;
    font-weight: 300;
    line-height: 1.6;
    color: var(--ash);
    padding: 0.6em 0;
    border-bottom: 1px solid rgba(42, 42, 42, 0.5);
}

.cs-scope__list li:last-child {
    border-bottom: none;
}

/* ─── Approach ──────────────────────────────────────── */
.cs-approach {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

@media (max-width: 768px) {
    .cs-approach {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
}

.cs-approach__item {
    padding-top: var(--space-md);
    border-top: 1px solid var(--graphite);
}

.cs-approach__num {
    display: block;
    font-size: 0.65rem;
    font-weight: 400;
    letter-spacing: 0.2em;
    color: var(--stone);
    margin-bottom: var(--space-sm);
}

.cs-approach__title {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--white);
    margin-bottom: var(--space-xs);
    letter-spacing: 0.02em;
}

.cs-approach__desc {
    font-size: 0.85rem;
    font-weight: 300;
    line-height: 1.7;
    color: var(--ash);
}

/* ─── CTA ───────────────────────────────────────────── */
.cs-cta {
    padding: var(--space-xl) 0;
    background-color: var(--black);
    border-top: 1px solid var(--charcoal);
}

.cs-cta__inner {
    display: flex;
    justify-content: center;
}

.cs-cta__link {
    display: inline-flex;
    align-items: center;
    gap: 0.8em;
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--white);
    padding: 1.2em 3em;
    border: 1px solid var(--graphite);
    transition:
        border-color var(--duration-fast) ease,
        background-color var(--duration-fast) ease;
}

.cs-cta__link:hover {
    border-color: var(--stone);
    background-color: rgba(255, 255, 255, 0.03);
}

.cs-cta__link svg {
    transition: transform var(--duration-fast) var(--ease-out);
}

.cs-cta__link:hover svg {
    transform: translate(2px, -2px);
}

/* ─── Next Project ──────────────────────────────────── */
.cs-next {
    background-color: var(--black-soft);
    border-top: 1px solid var(--charcoal);
}

.cs-next__link {
    display: block;
    padding: var(--space-xl) 0;
    text-decoration: none;
    transition: background-color var(--duration-fast) ease;
}

.cs-next__link:hover {
    background-color: var(--charcoal);
}

.cs-next__inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-sm);
}

.cs-next__title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 300;
    color: var(--white);
    letter-spacing: -0.01em;
}

.cs-next__arrow {
    font-size: 1.5rem;
    color: var(--stone);
    transition: transform var(--duration-fast) var(--ease-out);
}

.cs-next__link:hover .cs-next__arrow {
    transform: translateX(8px);
}

/* ─── Footer ────────────────────────────────────────── */
.cs-footer {
    padding: var(--space-xl) 0 var(--space-md) 0;
    background-color: var(--black);
    border-top: 1px solid var(--charcoal);
}

.cs-footer__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.cs-footer__inner .contact__copyright {
    font-size: 0.65rem;
    letter-spacing: 0.12em;
}

.cs-footer__inner .contact__footer-right {
    display: flex;
    gap: var(--space-lg);
}

.cs-footer__inner .contact__social {
    position: relative;
}

.cs-footer__inner .contact__social::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--stone);
    transition: width 0.3s ease;
}

.cs-footer__inner .contact__social:hover::after {
    width: 100%;
}

@media (max-width: 768px) {
    .cs-footer__inner {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }
}

/* ─── Mobile Gallery ───────────────────────────────── */
.cs-mobile-gallery {
    margin-top: var(--space-xl);
    overflow: visible;
    position: relative;
}

.cs-mobile-gallery::after {
    content: 'Swipe →';
    position: absolute;
    bottom: 0;
    right: 0;
    font-family: var(--font-sans);
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.35);
    animation: cs-swipe-fade 3s ease-out forwards;
    pointer-events: none;
    display: none;
}

@media (max-width: 768px) {
    .cs-mobile-gallery::after {
        display: block;
    }
}

@keyframes cs-swipe-fade {
    0% { opacity: 1; }
    70% { opacity: 1; }
    100% { opacity: 0; }
}

.cs-mobile-gallery__track {
    display: flex;
    gap: var(--space-lg);
    overflow-x: auto;
    overflow-y: clip;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding-top: 16px;
    margin-top: -16px;
    padding-bottom: var(--space-lg);
    scrollbar-width: none;
}

.cs-mobile-gallery__track::-webkit-scrollbar {
    display: none;
}

.cs-mobile-phone {
    flex: 0 0 220px;
    scroll-snap-align: start;
    position: relative;
    transition: transform 0.3s ease;
    padding: 8px;
    background-color: #1a1a1a;
    border-radius: 28px;
    border: 2px solid #333;
    box-shadow: inset 0 0 0 2px #0a0a0a, 0 10px 30px rgba(0,0,0,0.5);
}

.cs-mobile-phone:hover {
    transform: translateY(-8px);
}

.cs-mobile-phone img {
    width: 100%;
    display: block;
    border-radius: 20px;
}

.cs-mobile-phone__notch {
    position: absolute;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    width: 16px;
    height: 16px;
    background-color: #1a1a1a;
    border-radius: 50%;
    z-index: 10;
}

.cs-mobile-phone__label {
    display: block;
    text-align: center;
    font-size: 0.65rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--stone);
    margin-top: 24px;
    padding-bottom: 4px;
    position: absolute;
    bottom: -35px;
    left: 0;
    width: 100%;
}

@media (max-width: 600px) {
    .cs-mobile-phone {
        flex: 0 0 180px;
    }
}

/* ─── Hero Triptych (3 square images) ──────────────── */
.cs-hero-triptych {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: clamp(0.5rem, 1vw, 1rem);
}

.cs-hero-triptych__img {
    width: 100%;
    display: block;
    border-radius: 6px;
}

@media (max-width: 600px) {
    .cs-hero-triptych {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .cs-hero-triptych__img {
        border-radius: 4px;
    }
}

/* ─── Cinematic Video Break ───────────────────────── */
.cs-video-break {
    position: relative;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    overflow: hidden;
}

.cs-video-break video {
    width: 100%;
    display: block;
    border-radius: 12px;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

@media (max-width: 768px) {
    .cs-video-break {
        padding: 0 var(--space-md);
    }
    .cs-video-break video {
        border-radius: 8px;
    }
}