/* ═══════════════════════════════════════════════════════════════
   case-study.css — shared styles for all case study pages
   Padding matches main site: clamp(2rem, 6vw, 7rem) each side
══════════════════════════════════════════════════════════════ */

/* ─── Page wrapper ──────────────────────────────────────────── */
.cs-page {
  padding: 0 clamp(2rem, 6vw, 7rem) 8rem;
}

/* ─── Top nav ───────────────────────────────────────────────── */
.cs-topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2rem 0 0;
  margin-bottom: 5rem;
}

.cs-logo-link { display: flex; align-items: center; }

.cs-logo {
  height: 30px;
  width: auto;
  display: block;
  transition: opacity 0.25s ease;
}
.cs-logo-link:hover .cs-logo { opacity: 0.6; }

.cs-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
  text-decoration: none;
  transition: color 0.25s ease;
}
.cs-back-link:hover { color: var(--white); }

/* ─── Hero ──────────────────────────────────────────────────── */
.cs-hero {
  display: grid;
  grid-template-columns: 1fr min(800px, 50%);
  gap: 2rem clamp(2rem, 4vw, 5rem);
  align-items: start;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  margin-bottom: 3.5rem;
}

.cs-hero-right {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.07);
  margin-top: 0.5rem;
}

.cs-hero-right img {
  width: 100%;
  height: auto;
  display: block;
}

.cs-index-num {
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.25em;
  color: rgba(255, 255, 255, 0.2);
  margin: 0 0 1.5rem;
}

.cs-hero-title {
  font-size: clamp(2rem, 3.5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0 0 2rem;
}

.cs-hero-sans {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--white);
}

.cs-hero-serif {
  display: block;
  width: fit-content;
  font-family: var(--font-serif);
  font-weight: 600;
  font-style: italic;
  font-size: 1.1em;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #FFD44D, #ff8228);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Brief list ────────────────────────────────────────────── */
.cs-brief {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.cs-brief li {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.cs-brief li:first-child {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.cs-brief-label {
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.25);
  padding-top: 0.1em;
}

.cs-brief-value {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.7);
}

.cs-brief-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  transition: color 0.25s ease;
}
.cs-brief-link:hover { color: var(--white); }

/* ─── Tags ──────────────────────────────────────────────────── */
.cs-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.cs-tags span {
  font-family: var(--font-body);
  font-size: 0.62rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
  padding: 0.3em 0.85em;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 100px;
}

/* ─── Cover image ───────────────────────────────────────────── */
.cs-cover {
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.07);
  margin-bottom: 7rem;
}

.cs-cover img {
  width: 100%;
  height: auto;
  display: block;
}

/* ─── Two-column content blocks ─────────────────────────────── */
.cs-block {
  margin-bottom: 3rem;
}

.cs-block--two-col {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 1rem clamp(2rem, 4vw, 5rem);
}

.cs-block-label {
  font-family: var(--font-body);
  font-size: 0.62rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.22);
  padding-top: 0.4rem;
}

.cs-block-content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.cs-block-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 0;
}

.cs-block-content p {
  font-family: var(--font-body);
  font-size: clamp(0.9rem, 1.4vw, 1rem);
  font-weight: 300;
  line-height: 1.85;
  color: var(--white-dim);
  margin: 0;
}

/* --- Two-column content row (Overview + Interaction side by side) --- */
.cs-content-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem clamp(2rem, 4vw, 5rem);
  margin-bottom: 3rem;
  align-items: start;
}

/* ─── Stats row ─────────────────────────────────────────────── */
.cs-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 12px;
  overflow: hidden;
  margin-top: 1.75rem;
}

.cs-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.4rem;
  padding: 1.75rem 1rem;
  border-left: 1px solid rgba(255, 255, 255, 0.07);
}

.cs-stat:first-child { border-left: none; }

.cs-stat-n {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(to right, #FFD44D, #ff8228);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.cs-stat-l {
  font-family: var(--font-body);
  font-size: 0.62rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.28);
}

/* ─── Showcase / video ──────────────────────────────────────── */
.cs-showcase {
  margin-bottom: 3.5rem;
}

.cs-showcase-header {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1rem clamp(3rem, 5vw, 7rem);
  margin-bottom: 2.5rem;
}

.cs-showcase-header .cs-block-label { padding-top: 0.4rem; }

.cs-showcase-header .cs-block-title { margin-bottom: 0.5rem; }

.cs-showcase-desc {
  font-family: var(--font-body);
  font-size: clamp(0.9rem, 1.4vw, 1rem);
  font-weight: 300;
  line-height: 1.85;
  color: var(--white-dim);
  margin: 0;
}

.cs-video-wrap {
  position: relative;
  width: 100%;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.07);
  background: rgba(255, 255, 255, 0.02);
  aspect-ratio: 16 / 9;
  margin-top: 1.25rem;
}

.cs-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: inherit;
}

/* shown when video file is missing */
.cs-video-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  pointer-events: none;
}

.cs-video-fallback span {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.25);
}

.cs-video-fallback code {
  font-family: monospace;
  font-size: 0.75rem;
  color: rgba(255, 212, 77, 0.5);
}

/* hide fallback when video loads */
.cs-video:not([src=""]) + .cs-video-fallback,
.cs-video[src] + .cs-video-fallback { display: none; }

/* ─── Design System image ───────────────────────────────────── */
.cs-ds-wrap {
  position: relative;
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.07);
  margin-bottom: 3.5rem;
}

.cs-ds-wrap img {
  width: 100%;
  height: auto;
  display: block;
}

.cs-ds-fallback {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 320px;
  padding: 3rem;
  text-align: center;
}

.cs-ds-fallback p {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.25);
  margin: 0;
}

.cs-ds-fallback code {
  font-family: monospace;
  color: rgba(255, 212, 77, 0.5);
}

.cs-ds-sub {
  font-size: 0.62rem !important;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.14) !important;
}

/* ─── Design System Kit ─────────────────────────────────────────────────── */
.cs-ds-header {
  margin-bottom: 2rem;
}

.cs-ds-title {
  margin: 0.5rem 0 1rem;
}

.cs-ds-intro {
  font-family: var(--font-body);
  font-size: clamp(0.9rem, 1.4vw, 1rem);
  font-weight: 300;
  line-height: 1.85;
  color: var(--white-dim);
  max-width: 800px;
  margin: 0;
}


.cs-ds-kit {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.cs-ds-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 14px;
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.cs-ds-card-label {
  font-family: var(--font-body);
  font-size: 0.6rem;
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.25);
}

.cs-ds-card-desc {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 300;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.45);
  margin: 0;
}

/* — Swatches — */
.cs-ds-swatches {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.cs-ds-swatch {
  flex: 1 1 52px;
  min-height: 72px;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 0.45rem 0.5rem;
  gap: 0.15rem;
}

.cs-ds-swatch--grad {
  background: linear-gradient(135deg, #FF6B00, #FF9A3C);
}

.cs-ds-swatch-name {
  font-family: var(--font-body);
  font-size: 0.55rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg, rgba(255, 255, 255, 0.5));
}

.cs-ds-swatch-hex {
  font-family: monospace;
  font-size: 0.58rem;
  color: var(--fg, rgba(255, 255, 255, 0.35));
  opacity: 0.7;
}

/* — Typography stack — */
.cs-ds-type-stack {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.cs-ds-type-row {
  display: grid;
  grid-template-columns: 52px 1fr max-content;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.cs-ds-type-row:last-child { border-bottom: none; }

.cs-ds-type-role {
  font-family: var(--font-body);
  font-size: 0.58rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.22);
}

.cs-ds-type-sample {
  font-family: var(--font-display);
  color: var(--white);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
  max-width: 100%;
}

.cs-ds-type-meta {
  font-family: monospace;
  font-size: 0.58rem;
  color: rgba(255, 255, 255, 0.2);
  text-align: right;
  white-space: nowrap;
}

/* — Spacing blocks — */
.cs-ds-space-row {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
}

.cs-ds-space-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  font-family: monospace;
  font-size: 0.58rem;
  color: rgba(255, 255, 255, 0.3);
}

.cs-ds-space-block {
  background: rgba(255, 107, 0, 0.25);
  border: 1px solid rgba(255, 107, 0, 0.4);
  border-radius: 3px;
}

/* — Radii — */
.cs-ds-radii-row {
  display: flex;
  gap: 1.25rem;
  align-items: flex-end;
}

.cs-ds-radius-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-family: monospace;
  font-size: 0.57rem;
  color: rgba(255, 255, 255, 0.28);
  text-align: center;
  line-height: 1.5;
}

.cs-ds-radius-item em {
  font-style: normal;
  color: rgba(255, 255, 255, 0.18);
}

.cs-ds-radius-box {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

/* — Motion bar — */
.cs-ds-motion {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-top: 0.25rem;
}

.cs-ds-motion-label {
  font-family: var(--font-body);
  font-size: 0.58rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.22);
  white-space: nowrap;
}

.cs-ds-motion-bar {
  flex: 1;
  height: 3px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 100px;
  overflow: hidden;
}

.cs-ds-motion-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(to right, #FF6B00, #FF9A3C);
  border-radius: 100px;
  animation: ds-motion-pulse 2.4s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes ds-motion-pulse {
  0%   { width: 0%;   opacity: 1; }
  60%  { width: 100%; opacity: 1; }
  100% { width: 100%; opacity: 0; }
}

.cs-ds-motion-val {
  font-family: monospace;
  font-size: 0.56rem;
  color: rgba(255, 255, 255, 0.2);
  white-space: nowrap;
}

@media (max-width: 900px) {
  .cs-ds-kit { grid-template-columns: 1fr; }
}

/* ─── App portrait video pair ───────────────────────────────────────────── */
.cs-app-videos {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  justify-content: flex-start;
  margin-top: 0.5rem;
}

.cs-app-video-item {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 360px;
  flex-shrink: 0;
}

.cs-app-video-item .cs-block-content {
  padding: 0;
}

.cs-app-video-item p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--white-dim);
}

.cs-video-wrap--portrait {
  width: 360px;
  height: 640px;
  aspect-ratio: unset;
  flex-shrink: 0;
}

@media (max-width: 520px) {
  .cs-app-videos {
    flex-direction: column;
    align-items: flex-start;
  }
  .cs-app-video-item,
  .cs-video-wrap--portrait {
    width: 100%;
    height: auto;
    aspect-ratio: 9 / 16;
  }
}


.cs-ds-split-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2.5rem, 5vw, 6rem);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  align-items: start;
}

.cs-ds-split-left {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* compact variant: smaller padding, tighter gaps */
.cs-ds-kit--compact {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.cs-ds-kit--compact .cs-ds-card {
  padding: 1.25rem 1.5rem;
}

.cs-ds-split-right {
  position: sticky;
  top: 4rem;
  overflow: visible;
}

.cs-ds-split-right .cs-video-wrap {
  border-radius: 10px;
  overflow: hidden;
}

@media (max-width: 900px) {
  .cs-ds-split-row {
    grid-template-columns: 1fr;
  }
  .cs-ds-split-right {
    position: static;
  }
}

/* ─── Footer ────────────────────────────────────────────────── */
.cs-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 4rem;
  margin-top: 4rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.cs-footer-back {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
  text-decoration: none;
  transition: color 0.25s ease;
}
.cs-footer-back:hover { color: var(--white); }

.cs-footer-next {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.2rem;
  text-decoration: none;
}

.cs-footer-next-label {
  font-family: var(--font-body);
  font-size: 0.62rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.22);
}

.cs-footer-next-name {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--white);
  transition: color 0.25s ease;
}

.cs-footer-next:hover .cs-footer-next-name { color: rgba(255, 212, 77, 0.9); }

.cs-footer-next-name svg {
  transition: transform 0.3s var(--ease-out-expo);
}
.cs-footer-next:hover .cs-footer-next-name svg {
  transform: translateX(5px);
}

/* ─── Responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .cs-hero {
    grid-template-columns: 1fr;
    gap: 2rem 0;
  }

  .cs-content-row,
  .cs-block--two-col {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .cs-block-label {
    padding-top: 0;
  }

  .cs-stats {
    grid-template-columns: 1fr 1fr;
  }

  .cs-stat:nth-child(odd) { border-left: none; }
  .cs-stat:nth-child(3),
  .cs-stat:nth-child(4) {
    border-top: 1px solid rgba(255, 255, 255, 0.07);
  }
}

@media (max-width: 540px) {
  .cs-topnav {
    margin-bottom: 2rem;
  }

  .cs-hero-sans {
    font-size: 28px !important;
  }

  .cs-hero-serif {
    font-size: 40px !important;
  }

  .cs-stats {
    grid-template-columns: 1fr 1fr;
  }

  .cs-stat {
    border-left: none;
    border-top: 1px solid rgba(255, 255, 255, 0.07);
  }

  .cs-stat:first-child,
  .cs-stat:nth-child(2) {
    border-top: none;
  }

  .cs-stat:nth-child(odd) {
    border-left: none;
  }

  .cs-stat:nth-child(even) {
    border-left: 1px solid rgba(255, 255, 255, 0.07);
  }

  .cs-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 2.5rem;
  }

  .cs-footer-next { align-items: flex-start; }
}