/***************************** CASE STUDY LAYOUT *****************************/

.case-study {
    display: grid;
    grid-template-columns: 14rem minmax(0, 1fr);
    gap: 0 4rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 10rem 1.5rem 4rem;
    text-align: left;
}

.case-study > * {
    min-width: 0;
}

/* hero spans the article column; the rail sits beside the sections below it */
.case-hero {
    grid-column: 2;
}

.case-main {
    grid-column: 2;
    grid-row: 2;
}

/* ---------- Scroll tracker ---------- */

.case-contents {
    /* sticks alongside the article as it scrolls */
    grid-column: 1;
    grid-row: 2;
    position: sticky;
    top: 8rem;
    align-self: start;
}

.case-contents-label {
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.4);
    margin-bottom: 1rem;
}

.case-contents-nav {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0;
    border-left: 1px solid rgba(255, 255, 255, 0.15);
}

/* one bar that slides between topics instead of five that fade */
.case-contents-marker {
    position: absolute;
    left: -1px;
    top: 0;
    width: 2px;
    height: 0;
    background: var(--accent-color);
    border-radius: 1px;
    transition: translate 0.35s cubic-bezier(0.4, 0, 0.2, 1),
        height 0.35s cubic-bezier(0.4, 0, 0.2, 1),
        width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.case-contents-nav a {
    position: relative;
    padding: 0.6rem 0 0.6rem 1.1rem;
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.4);
    text-decoration: none;
    transition: color 0.3s ease;
}

.case-contents-nav a:hover {
    color: rgba(255, 255, 255, 0.75);
}

.case-contents-nav a.is-active {
    color: white;
}

/* ---------- Hero ---------- */

.case-eyebrow {
    font-size: 0.8rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.45);
    margin-bottom: 1.5rem;
}

/* ---------- Meta cards ---------- */

.case-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 2.5rem;
}

.case-meta-card {
    /* hugs its own text instead of stretching to fill a column */
    flex: 0 0 auto;
    min-width: 0;
    padding: 0.85rem 1.1rem;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 0.75rem;
}

.case-meta-label {
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.45);
    margin-bottom: 0.35rem;
}

.case-meta-value {
    font-size: 0.95rem;
    color: white;
    /* one line each, so every card ends up the same height */
    white-space: nowrap;
    overflow-wrap: anywhere;
}

/* ---------- Cover + body ---------- */

.case-cover {
    position: relative;
    /* smaller than the article column, and the same box on every case study */
    max-width: 42rem;
    margin: 0 0 2.5rem;
}

.case-cover img {
    display: block;
    width: 100%;
    /* The six covers range from 1.34 to 1.89 in aspect. A fixed 16:9 box plus
       "contain" gives every page an identical cover without cropping anyone's
       artwork - the spare space just reads as background. */
    aspect-ratio: 16 / 9;
    object-fit: contain;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 1rem;
}

/* sticks to the bottom of the viewport but stays centred on the article column,
   because it lives inside it rather than being fixed to the page */
.case-float-wrap {
    position: sticky;
    bottom: 1.75rem;
    z-index: 950;
    display: flex;
    justify-content: center;
    padding-top: 3rem;
    pointer-events: none;
}

.case-float-cta {
    /* hidden until .is-visible is set on scroll */
    opacity: 0;
    pointer-events: none;

    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 1.6rem;
    border-radius: 2rem;
    white-space: nowrap;

    color: white;
    font-weight: 500;
    text-decoration: none;

    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    box-shadow: 0 0.5rem 2rem rgba(0, 0, 0, 0.35);

    transition: background-color 0.25s ease, border-color 0.25s ease,
        opacity 0.35s ease, translate 0.35s ease;
}

.case-float-cta.is-visible {
    opacity: 1;
    pointer-events: auto;
}

@media (prefers-reduced-motion: reduce) {
    .case-contents-marker {
        transition: none;
    }
}

.case-float-cta span {
    transition: translate 0.25s ease-in-out;
}

.case-float-cta:hover {
    background: rgba(255, 255, 255, 0.22);
    border-color: rgba(255, 255, 255, 0.55);
}

.case-float-cta:hover span {
    translate: 0.25rem 0;
}

.case-section {
    /* clears the fixed header when a contents link jumps here */
    scroll-margin-top: 8rem;
    padding-top: 1rem;
}

.case-section h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.case-section p {
    font-size: 1rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.7);
    /* full column width, so body copy lines up with the images and meta cards */
}

.case-section figure {
    margin: 2rem 0 0;
}

/* a section can now run text > image > text, so space the copy off the image */
.case-section figure + p {
    margin-top: 2rem;
}

.case-section figure img {
    width: 100%;
    height: auto;
    border-radius: 0.75rem;
}

.case-video video {
    width: 100%;
    height: auto;
    border-radius: 0.75rem;
    display: block;
}

/* ===================CASE STUDY RESPONSIVE========================= */

/* Tablet */
@media (max-width: 1024px) {
    .case-study {
        grid-template-columns: 1fr;
        gap: 0;
        padding-top: 8rem;
    }

    /* everything stacks in source order: hero, contents, article */
    .case-hero,
    .case-contents,
    .case-main {
        grid-column: auto;
        grid-row: auto;
    }

    .case-contents {
        margin-bottom: 2rem;
    }

    /* the tracker becomes a horizontal strip under the header */
    .case-contents {
        position: sticky;
        top: 5rem;
        z-index: 900;
        background: rgba(0, 0, 0, 0.85);
        backdrop-filter: blur(10px);
        padding: 0.75rem 0;
        margin: 0 -1.5rem;
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }

    .case-contents-label {
        display: none;
    }

    .case-contents-nav {
        flex-direction: row;
        gap: 0.25rem;
        border-left: 0;
        overflow-x: auto;
        scrollbar-width: none;
    }

    .case-contents-nav::-webkit-scrollbar {
        display: none;
    }

    .case-contents-nav a {
        padding: 0.4rem 0.75rem;
        white-space: nowrap;
        border-radius: 2rem;
    }

    .case-contents-marker {
        left: 0;
        top: auto;
        bottom: 0;
        width: 0;
        height: 2px;
    }

}

/* Mobile */
@media (max-width: 768px) {
    .case-study {
        padding-top: 6rem;
    }

    .case-cover {
        max-width: none;
    }

    /* Meta drops the boxes and becomes a two-column label/value block,
       fenced top and bottom by hairlines. */
    .case-meta {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1.25rem 1rem;
        padding: 1.5rem 0;
        margin-bottom: 0;
        border-top: 1px solid rgba(255, 255, 255, 0.12);
        border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    }

    .case-meta-card {
        padding: 0;
        border: 0;
        border-radius: 0;
    }

    /* Tools runs long, so give it the full width */
    .case-meta-card:last-child {
        grid-column: 1 / -1;
    }

    .case-meta-value {
        white-space: normal;
    }

    /* Contents becomes a plain row of links sitting under the meta block */
    .case-contents {
        position: static;
        z-index: auto;
        background: none;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        margin: 1.5rem 0 0;
        padding: 0;
    }

    .case-contents-nav {
        gap: 1.25rem;
    }

    .case-contents-nav a {
        padding: 0.25rem 0;
        border-radius: 0;
    }

    /* no room for the sliding bar - the active link just brightens */
    .case-contents-marker {
        display: none;
    }

    .case-float-wrap {
        bottom: 1.25rem;
    }

    .case-float-cta {
        padding: 0.7rem 1.2rem;
        font-size: 0.9rem;
    }

    .case-section {
        padding-top: 3rem;
    }

    .case-section h2 {
        font-size: 1.4rem;
    }
}

/* Small phones */
@media (max-width: 480px) {
    .case-meta {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .case-meta-card:last-child {
        grid-column: auto;
    }
}

/* ---------- Extras used by the other case studies ---------- */

/* two or three clips side by side (prototype walkthroughs) */
.case-video-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.case-video-row video {
    width: 100%;
    height: auto;
    border-radius: 0.75rem;
    display: block;
}

.case-section ul {
    margin: 1.25rem 0 0;
    padding-left: 1.15rem;
}

.case-section li {
    font-size: 1rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0.6rem;
}

.case-section li::marker {
    color: rgba(255, 255, 255, 0.3);
}

.case-section figure a {
    display: block;
}

.case-section code {
    padding: 0.1rem 0.35rem;
    border-radius: 0.3rem;
    background: rgba(255, 255, 255, 0.08);
    font-size: 0.9em;
}