/* ===========================================================================
   case.css — the long-form case-study page.

   Deliberately narrower and quieter than the index: this is a reading page,
   so the measure is short, the rhythm is vertical, and the only loud element
   is the title. The page takes the project's own colour (core.js
   applyProjectTheme), so every accent below follows it.
   =========================================================================== */

.case-loading { padding-block: calc(var(--nav-h) + 80px) 60px; }

/* Article progress — mobile only; on desktop the ring in the contents does it. */
.case-progress {
    position: fixed; top: 0; left: 0; right: 0;
    height: 3px;
    z-index: calc(var(--z-nav) + 1);
    pointer-events: none;
}
.case-progress i {
    display: block; height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-lift));
    transform: scaleX(0); transform-origin: left;
    transition: transform .08s linear;
}
@media (min-width: 901px) { .case-progress { display: none; } }

/* ---- Masthead ---------------------------------------------------------- */

.case-head {
    position: relative;
    padding-block: calc(var(--nav-h) + 64px) 54px;
}

/* Breadcrumbs (UI6). */
.crumbs {
    display: flex; align-items: center; gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 30px;
    font-family: var(--font-mono); font-size: var(--t-2xs);
    text-transform: uppercase; letter-spacing: .12em;
    color: var(--ink-35);
}
.crumbs svg { width: 12px; height: 12px; color: var(--ink-20); }
.crumbs a { transition: color var(--d-2) var(--e-out); }
.crumbs a:hover { color: var(--accent); }
.crumbs [aria-current] {
    color: var(--ink-70);
    max-width: 28ch;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.case-mast {
    display: flex; align-items: center; gap: 16px;
    margin-bottom: 22px;
}
.case-plaque {
    margin-bottom: 0;
    flex: none;
    view-transition-name: case-plaque;
}

.case-eyebrow {
    display: flex; align-items: center; gap: 10px;
    flex-wrap: wrap;
    font-family: var(--font-mono); font-size: var(--t-2xs);
    text-transform: uppercase; letter-spacing: .12em;
    color: var(--ink-35);
}

.case-title {
    font-family: var(--font-display);
    font-optical-sizing: auto;
    font-size: clamp(2.6rem, 7vw, 5.4rem);
    font-weight: 350;
    line-height: .98;
    letter-spacing: -.04em;
    font-variation-settings: "SOFT" 24, "WONK" 1;
    margin-bottom: 22px;
    overflow-wrap: anywhere;
    view-transition-name: case-title;
}

.case-lead {
    max-width: 56ch;
    font-size: var(--t-lead);
    line-height: 1.6;
    color: var(--ink-50);
}

.case-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 32px; }

/* ---- Metric band ------------------------------------------------------- */

/* Flex rather than grid: an odd metric stretches to fill its row instead of
   leaving an empty hairline-coloured cell beside it. */
.case-metrics {
    display: flex;
    flex-wrap: wrap;
    gap: 1px;
    margin-top: 48px;
    background: var(--line);
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    overflow: hidden;
}
.case-metric { flex: 1 1 150px; padding: 22px; background: var(--paper); }
.case-metric dt {
    font-family: var(--font-display);
    font-size: clamp(1.7rem, 3vw, 2.4rem);
    font-weight: 400; line-height: 1.1;
    letter-spacing: -.03em;
    color: var(--ink);
    font-variant-numeric: lining-nums tabular-nums;
    overflow-wrap: anywhere;
}
.case-metric dd {
    font-family: var(--font-mono); font-size: var(--t-2xs);
    text-transform: uppercase; letter-spacing: .1em;
    color: var(--ink-35); margin-top: 8px;
}

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

.case-media {
    position: relative;
    aspect-ratio: 16 / 9;
    border-radius: var(--r-2xl);
    overflow: hidden;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-3);
    background: var(--paper-sunk);
    margin-bottom: clamp(50px, 8vh, 90px);
}
.case-media iframe, .case-media img { width: 100%; height: 100%; border: 0; object-fit: cover; }

/* With a device frame inside, the media box becomes a toned stage. */
.case-media:has(.dframe) {
    aspect-ratio: auto;
    padding: clamp(22px, 5vw, 64px) clamp(18px, 6vw, 84px);
    background:
        radial-gradient(80% 90% at 80% 0%, color-mix(in srgb, var(--tone-b) 26%, transparent), transparent 62%),
        linear-gradient(170deg, var(--tone-t), var(--paper-sunk));
}
.case-media:has(.dframe) .case-zoom { height: auto; }
.case-media .case-phones { padding: 0; }
.case-media .case-phones .case-zoom { width: min(28%, 220px); flex: none; }
.case-media .case-phones .case-zoom .dframe--phone { width: 100%; }
.case-media .case-phones[data-count="3"] .case-zoom:nth-child(1) { transform: translateY(16px) rotate(-4deg); }
.case-media .case-phones[data-count="3"] .case-zoom:nth-child(2) { transform: translateY(-8px); z-index: 1; }
.case-media .case-phones[data-count="3"] .case-zoom:nth-child(3) { transform: translateY(16px) rotate(4deg); }
.case-media .case-phones .dframe--phone { transform: none !important; }
.case-mast .case-plaque .appicon { --ai: 52px; }

.case-zoom {
    display: block; width: 100%; height: 100%;
    padding: 0;
    cursor: zoom-in;
}
.case-zoom img { transition: transform var(--d-5) var(--e-expo); }
.case-zoom:hover img { transform: scale(1.015); }

/* ---- Body -------------------------------------------------------------- */

.case-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: clamp(36px, 6vw, 88px);
    align-items: start;
    padding-bottom: clamp(60px, 10vh, 120px);
}

.case-prose { max-width: 66ch; min-width: 0; }

.case-block { margin-bottom: clamp(42px, 6vh, 72px); }

.case-block h2 {
    display: flex; align-items: baseline; gap: 14px;
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 2.6vw, 2.1rem);
    font-weight: 400;
    letter-spacing: -.025em;
    font-variation-settings: "SOFT" 24, "WONK" 1;
    margin-bottom: 20px;
}
.case-block h2 b {
    font-family: var(--font-mono);
    font-size: var(--t-2xs);
    font-weight: 500;
    color: var(--accent);
    letter-spacing: .12em;
}

.case-block p {
    font-size: 1.06rem;
    line-height: 1.78;
    color: var(--ink-70);
    white-space: pre-line;
}
.case-block p + p { margin-top: 1.1em; }

/* "What broke" — numbered, because the count is the point. */
.case-breaks { counter-reset: brk; display: grid; gap: 2px; }
.case-breaks li {
    counter-increment: brk;
    display: grid; grid-template-columns: auto 1fr; gap: 16px;
    padding: 18px 4px;
    border-top: 1px solid var(--line);
    font-size: var(--t-sm);
    color: var(--ink-70);
    line-height: 1.65;
}
.case-breaks li:last-child { border-bottom: 1px solid var(--line); }
.case-breaks li::before {
    content: counter(brk, decimal-leading-zero);
    font-family: var(--font-mono);
    font-size: var(--t-2xs);
    color: var(--accent);
    padding-top: 4px;
}

/* ---- Pull quotes (Design 3) --------------------------------------------
   Big Fraunces italic with hanging punctuation: the opening mark sits in the
   margin so the text's left edge stays on the column. */

.pullquote {
    position: relative;
    margin: clamp(30px, 5vh, 52px) 0;
    padding: 6px 0 6px clamp(18px, 3vw, 30px);
    border-left: 2px solid var(--accent);
}
.case-block .pullquote { margin-block: 28px; }
.pullquote p, .case-block .pullquote p {
    font-family: var(--font-display);
    font-optical-sizing: auto;
    font-style: italic;
    font-size: clamp(1.45rem, 2.7vw, 2.05rem);
    font-weight: 380;
    line-height: 1.28;
    letter-spacing: -.02em;
    color: var(--ink);
    font-variation-settings: "SOFT" 70, "WONK" 1;
    white-space: normal;
    hanging-punctuation: first;
    text-wrap: balance;
}
.pullquote p::before {
    content: "“";
    position: absolute;
    left: -.08em; top: -.38em;
    translate: -100% 0;
    font-size: 3.4em;
    line-height: 1;
    color: var(--accent);
    opacity: .9;
}
.pullquote p::after { content: "”"; color: var(--accent); }
@media (max-width: 640px) {
    .pullquote p::before { position: static; translate: none; font-size: 1em; margin-right: .05em; }
}
.pullquote--auto { border-left-style: dashed; }

/* ---- Gallery ----------------------------------------------------------- */

.case-gallery { display: grid; gap: 16px; margin-top: 6px; }
.case-shot {
    border-radius: var(--r-lg);
    overflow: hidden;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-2);
    background: var(--paper-sunk);
    transition: transform var(--d-3) var(--e-expo), box-shadow var(--d-3) var(--e-expo);
}
.case-shot:hover { transform: translateY(-3px); box-shadow: var(--shadow-3); }
.case-shot img { width: 100%; height: auto; display: block; }

/* Changelog + reactions sit after the numbered sections. */
.case-extra { margin-bottom: 30px; }
.case-prose .reacts { margin-top: 10px; }

/* Lightbox */
.lightbox {
    position: fixed; inset: 0;
    z-index: var(--z-sheet);
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px;
    padding: 24px;
    background: rgba(8, 7, 6, .88);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    opacity: 0; visibility: hidden;
    transition: opacity var(--d-2) var(--e-out), visibility var(--d-2);
    cursor: zoom-out;
}
.lightbox.is-open { opacity: 1; visibility: visible; }
.lb-figure { display: grid; justify-items: center; gap: 12px; min-width: 0; }
.lb-figure img {
    max-width: 100%; max-height: 82svh;
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-4);
    transform: scale(.96);
    transition: transform var(--d-3) var(--e-expo);
    cursor: default;
}
.lightbox.is-open .lb-figure img { transform: none; }
.lb-figure figcaption {
    display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
    font-family: var(--font-mono); font-size: var(--t-2xs);
    color: rgba(250, 247, 241, .72);
    text-align: center;
}
.lb-btn {
    display: grid; place-items: center;
    width: 46px; height: 46px;
    border-radius: 50%;
    background: rgba(250, 247, 241, .1);
    border: 1px solid rgba(250, 247, 241, .18);
    color: #FAF7F1;
    transition: background var(--d-2) var(--e-out), transform var(--d-2) var(--e-spring);
}
.lb-btn:hover { background: rgba(250, 247, 241, .2); transform: scale(1.08); }
.lb-btn svg { width: 18px; height: 18px; }
.lb-close { position: absolute; top: 18px; right: 18px; }
.lightbox.is-single .lb-prev, .lightbox.is-single .lb-next { visibility: hidden; }
@media (max-width: 640px) {
    .lightbox { padding: 12px; gap: 4px; }
    .lb-prev, .lb-next { width: 38px; height: 38px; }
}

/* ---- Sidebar ----------------------------------------------------------- */

.case-side {
    position: sticky;
    top: calc(var(--nav-h) + 28px);
    display: grid;
    gap: 26px;
    min-width: 0;
}
.case-side section h5 {
    font-family: var(--font-mono); font-size: var(--t-2xs);
    text-transform: uppercase; letter-spacing: .12em;
    color: var(--ink-35);
    margin-bottom: 12px;
    font-weight: 500;
}
.case-side dl { display: grid; gap: 10px; }
.case-side dl div { display: flex; justify-content: space-between; align-items: center; gap: 12px; font-size: var(--t-xs); }
.case-side dt { color: var(--ink-35); }
.case-side dd { color: var(--ink-70); font-weight: 500; text-align: right; }

/* Table of contents (UI7). */
.case-toc h5 { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.case-ring { display: inline-flex; align-items: center; gap: 7px; color: var(--ink-50); }
.case-ring svg { width: 20px; height: 20px; rotate: -90deg; }
.case-ring circle {
    fill: none;
    stroke: var(--line-strong);
    stroke-width: 2.4;
}
.case-ring .case-ring-bar {
    stroke: var(--accent);
    stroke-linecap: round;
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    transition: stroke-dashoffset .1s linear;
}
.case-ring b { font-weight: 500; min-width: 3.4ch; text-align: right; font-variant-numeric: tabular-nums; }

.case-toc ol { display: grid; gap: 2px; border-left: 1px solid var(--line); }
.case-toc a {
    position: relative;
    display: flex; gap: 10px; align-items: baseline;
    padding: 6px 0 6px 14px;
    font-size: var(--t-xs);
    color: var(--ink-50);
    transition: color var(--d-2) var(--e-out), padding-left var(--d-3) var(--e-expo);
}
.case-toc a b {
    font-family: var(--font-mono); font-size: var(--t-2xs);
    font-weight: 500; color: var(--ink-35);
}
.case-toc a::before {
    content: "";
    position: absolute; left: -1px; top: 6px; bottom: 6px;
    width: 2px;
    background: var(--accent);
    border-radius: 2px;
    transform: scaleY(0);
    transition: transform var(--d-3) var(--e-expo);
}
.case-toc a:hover { color: var(--ink); padding-left: 18px; }
.case-toc a.is-active { color: var(--ink); }
.case-toc a.is-active b { color: var(--accent); }
.case-toc a.is-active::before { transform: scaleY(1); }

/* Tech list with monochrome marks (Design 8). */
.case-tech { display: grid; gap: 8px; }
.case-tech li {
    display: flex; align-items: center; gap: 10px;
    font-size: var(--t-xs); color: var(--ink-70);
    min-width: 0;
}
.case-tech li span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---- Related + prev/next ---------------------------------------------- */

.case-related { padding-bottom: clamp(50px, 8vh, 90px); }
.case-related .sec-index b { font-family: var(--font-sans); }

.case-next {
    border-top: 1px solid var(--line);
    padding-block: clamp(40px, 7vh, 80px);
}
.case-pager {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.case-pager-link {
    display: grid; gap: 10px; align-content: start;
    min-width: 0;
    color: var(--ink);
    transition: color var(--d-2) var(--e-out);
}
.case-pager-link--next { text-align: right; grid-column: 2; }
.case-pager-link span {
    font-family: var(--font-mono); font-size: var(--t-2xs);
    text-transform: uppercase; letter-spacing: .12em;
    color: var(--ink-35);
}
.case-pager-link b {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 4vw, 3rem);
    font-weight: 350;
    line-height: 1.05;
    letter-spacing: -.035em;
    overflow-wrap: anywhere;
    transition: transform var(--d-3) var(--e-expo);
}
.case-pager-link:hover { color: var(--accent); }
.case-pager-link--prev:hover b { transform: translateX(-6px); }
.case-pager-link--next:hover b { transform: translateX(6px); }
@media (max-width: 640px) {
    .case-pager { grid-template-columns: 1fr; }
    .case-pager-link--next { grid-column: 1; text-align: left; }
}

/* ---- Empty / error ----------------------------------------------------- */

.case-missing {
    min-height: 70svh;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    text-align: center; gap: 16px;
}
.case-missing h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 400;
}
.case-missing p { color: var(--ink-50); max-width: 44ch; }

@media (max-width: 900px) {
    .case-body { grid-template-columns: 1fr; }
    .case-side { position: static; }
    .case-toc { display: none; }
}

@media print {
    .case-progress, .case-toc, .reacts, .case-pager, .lightbox { display: none !important; }
    .case-body { grid-template-columns: 1fr; }
    .case-side { position: static; }
}