/* Case-study layout: cover → metadata → context → final artifacts → design moments → impact → reflection. */

.cs {
  --cs-read: 760px;
  --cs-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --cs-accent: #fd8c73;
}

/* Back link and table of contents remain one visible group. */
.cs-nav {
  max-width: var(--cs-read);
  margin: 20px auto 0;
  padding: 0 24px;
}
.cs-nav-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--cs-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--portfolio-fg-muted);
  text-decoration: none;
}
.cs-nav-back:hover { color: var(--portfolio-fg); }
.cs-nav-title {
  margin: 20px 0 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--portfolio-fg);
}
.cs-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 16px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.cs-nav-list a {
  display: block;
  padding: 5px 0;
  border-bottom: 2px solid transparent;
  font-size: 13px;
  line-height: 1.35;
  color: var(--portfolio-fg-muted);
  text-decoration: none;
}
.cs-nav-list a:hover { color: var(--portfolio-fg); text-decoration: none; }
.cs-nav-list a.active {
  color: var(--portfolio-fg);
  border-bottom-color: var(--cs-accent);
}
@media (min-width: 1200px) {
  .cs-nav {
    position: fixed;
    top: 92px;
    left: 40px;
    z-index: 15;
    width: 184px;
    margin: 0;
    padding: 0;
  }
  .cs-nav-title { margin-top: 22px; }
  .cs-nav-list {
    display: block;
    border-left: 1px solid var(--portfolio-border-muted);
  }
  .cs-nav-list a {
    padding: 6px 0 6px 14px;
    margin-left: -1px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }
  .cs-nav-list a.active { border-left-color: var(--cs-accent); }
}

.cs-kicker,
.cs-label {
  font-family: var(--cs-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--portfolio-fg-muted);
}

/* Cover. */
.cs-hero { max-width: var(--cs-read); margin: 0 auto; padding: 40px 24px 0; }
.cs-kicker { margin: 0 0 16px; }
.cs-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 4.6vw, 54px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--portfolio-fg);
}
.cs-lede { margin: 18px 0 0; font-size: 19px; line-height: 1.55; color: var(--portfolio-fg-muted); }
.cs-cover { max-width: var(--cs-read); margin: 30px auto 0; padding: 0 24px; }
.cs-cover-media { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: var(--portfolio-bg-muted); }
.cs-cover-media.seq { object-fit: contain; }

/* Metadata is intentionally open: no divider rules. */
.cs-meta {
  max-width: var(--cs-read);
  margin: 38px auto 0;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.cs-meta dt {
  margin: 0 0 8px;
  font-family: var(--cs-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--portfolio-fg-muted);
}
.cs-meta dd { margin: 0; font-size: 13.5px; line-height: 1.45; color: var(--portfolio-fg); }
.cs-meta-list { display: flex; flex-direction: column; gap: 3px; }

/* Chapters create the larger rhythm; related text, grids, and evidence stay together inside. */
.cs-chapter { max-width: var(--cs-read); margin: 128px auto 0; padding: 0 24px; scroll-margin-top: 80px; }
.cs-section { margin: 0; padding: 0; }
.cs-label { margin: 0 0 14px; }
.cs-section h2 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.14;
  color: var(--portfolio-fg);
}
.cs-section p { margin: 0 0 20px; font-size: 17px; line-height: 1.7; color: var(--portfolio-fg-muted); }
.cs-section > .cs-lede { margin: 0 0 6px; font-size: 18px; }
.cs-section p strong { color: var(--portfolio-fg); font-weight: 600; }
.cs-subsection { margin-top: 72px; }

/* Parallel information and outcomes. */
.cs-grid { margin: 28px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 36px; }
.cs-grid.cols-2 { grid-template-columns: repeat(2, 1fr); gap: 40px; }
.cs-grid-item h4 { margin: 0 0 10px; font-size: 17px; font-weight: 600; line-height: 1.3; color: var(--portfolio-fg); }
.cs-grid-item p { margin: 0; font-size: 14.5px; line-height: 1.6; color: var(--portfolio-fg-muted); }
.cs-grid.reflect { gap: 44px 40px; }
.cs-grid.reflect .cs-grid-item h4 { font-family: var(--font-display); font-size: 22px; font-weight: 500; }
.cs-impact-grid h4 { font-size: 20px; }

/* Figma/FigJam-like evidence boards. */
.cs-board {
  position: relative;
  margin: 36px 0 0;
  padding: 56px 18px 18px;
  border: 1px solid var(--portfolio-border-muted);
  background: var(--portfolio-bg-muted);
}
.cs-board-label {
  position: absolute;
  top: 16px;
  left: 18px;
  margin: 0;
  padding: 4px;
  border: 1px solid var(--portfolio-border-muted);
  border-radius: 4px;
  background: var(--portfolio-bg);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 1.3;
  text-transform: none;
  color: var(--portfolio-fg);
}
.cs-board .cs-figure img,
.cs-board .cs-figure video { background: var(--portfolio-bg); }
.cs-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.cs-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.cs-figure { margin: 0; }
.cs-figure img,
.cs-figure video { display: block; width: 100%; border: 1px solid var(--portfolio-border-muted); background: var(--portfolio-bg-muted); }
.cs-caption { margin: 12px 0 0; font-size: 13px; line-height: 1.5; color: var(--portfolio-fg-muted); }
.cs-caption b { color: var(--portfolio-fg); font-weight: 600; }
.cs-reference-item { min-width: 0; }

/* Programmatic problem illustration: one intention fragmented across four tools. */
.cs-problem-illustration {
  margin-top: 36px;
  padding: 38px 34px 32px;
  border: 1px solid var(--portfolio-border-muted);
  background: var(--portfolio-bg-muted);
}
.cs-problem-tools { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.cs-problem-tool {
  display: grid;
  justify-items: center;
  gap: 10px;
  padding: 22px 10px 18px;
  border: 1px solid var(--portfolio-border-muted);
  background: var(--portfolio-bg);
  color: var(--portfolio-fg-muted);
  font-size: 13px;
}
.cs-problem-tool svg { width: 28px; height: 28px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.cs-problem-fragments { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; padding: 14px 0 12px; }
.cs-problem-fragments span { height: 1px; background: repeating-linear-gradient(90deg, var(--portfolio-border) 0 6px, transparent 6px 11px); }
.cs-problem-outcome { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; padding: 18px 20px; border: 1px solid var(--portfolio-border-muted); background: var(--portfolio-bg); }
.cs-problem-outcome span { color: var(--portfolio-fg-muted); font-size: 13px; }
.cs-problem-outcome strong { color: var(--portfolio-fg); font-size: 15px; font-weight: 600; text-align: right; }

/* Real SVG phone frame and its calibrated screen crop. */
.cs-device {
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 22px;
  background: var(--portfolio-bg-muted);
}
.cs-device-media { position: relative; display: block; height: 100%; width: auto; aspect-ratio: 433 / 892; overflow: visible; }
.cs-device-media-screen {
  position: absolute;
  z-index: 2;
  top: 2.24%;
  left: 4.62%;
  width: 90.76%;
  height: 95.52%;
  overflow: hidden;
  border-radius: 13% / 6%;
  background: #05070a;
}
.cs-device-media-content { position: relative; z-index: 1; display: block; width: 100%; height: 100%; border: 0; object-fit: cover; }
.cs-device-media-frame { position: absolute; z-index: 1; inset: 0; display: block; width: 100%; height: 100%; object-fit: contain; pointer-events: none; }

/* Recording controls stay out of the composition until the media is hovered or keyboard-focused. */
.cs-media-control-host { position: relative; }
.cs-media-controls {
  position: absolute;
  z-index: 6;
  top: 10px;
  right: 10px;
  display: flex;
  gap: 6px;
  opacity: 0;
  transform: translateY(-3px);
  transition: opacity .16s ease, transform .16s ease;
  pointer-events: none;
}
.cs-media-control-host:hover .cs-media-controls,
.cs-media-control-host:focus-within .cs-media-controls,
.cs-media-control-host.is-controls-visible .cs-media-controls {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.cs-media-control-button {
  display: grid;
  width: 30px;
  height: 30px;
  padding: 0;
  place-items: center;
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 50%;
  background: rgba(17,24,32,.78);
  color: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
  backdrop-filter: blur(8px);
  cursor: pointer;
}
.cs-media-control-button:hover,
.cs-media-control-button:focus-visible { background: rgba(17,24,32,.94); outline: none; }
.cs-media-control-button svg { display: block; width: 14px; height: 14px; fill: currentColor; }

/* Final artifact and flow rows. Copy is bottom-aligned to its media. */
.cs-flow { margin: 44px 0 0; display: flex; flex-direction: column; gap: 64px; }
.cs-flow-step { display: flex; align-items: stretch; gap: 44px; }
.cs-flow-media { flex: 0 0 300px; margin: 0; }
.cs-flow-text { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; padding-bottom: 2px; }
.cs-flow-num { margin: 0 0 8px; font-family: var(--cs-mono); font-size: 12px; letter-spacing: .06em; color: var(--cs-accent); }
.cs-flow-text h3,
.cs-decision-copy h3 { margin: 0 0 10px; font-family: var(--font-display); font-size: 22px; font-weight: 700; letter-spacing: -0.01em; line-height: 1.2; color: var(--portfolio-fg); }
.cs-flow-text p,
.cs-decision-copy p { margin: 0; font-size: 15.5px; line-height: 1.65; color: var(--portfolio-fg-muted); }
.cs-flow-step-wide .cs-flow-media { flex-basis: 440px; }
.cs-flow-step-onboarding { display: block; }
.cs-flow-step-onboarding .cs-flow-media { width: 100%; }
.cs-flow-step-onboarding .cs-flow-text { min-height: 0; padding: 22px 0 0; }
.cs-artifact-placeholder {
  display: grid;
  place-items: center;
  width: 100%;
  border: 1px solid var(--portfolio-border-muted);
  background: var(--portfolio-bg-muted);
  color: var(--portfolio-fg-muted);
  font-family: var(--cs-mono);
  font-size: 11px;
  letter-spacing: .05em;
  text-transform: uppercase;
}
.cs-artifact-placeholder-device { aspect-ratio: 4 / 5; }
.cs-artifact-placeholder-device > .cs-device { width: 100%; height: 100%; aspect-ratio: auto; background: transparent; }
.cs-artifact-placeholder-wide > .cs-device { width: 100%; height: 100%; aspect-ratio: auto; background: transparent; }
.cs-device-placeholder .cs-device-media-screen {
  display: grid;
  place-items: center;
  padding: 18px;
  background: var(--portfolio-bg);
  color: var(--portfolio-fg-muted);
  text-align: center;
}
.cs-artifact-placeholder-wide { aspect-ratio: 16 / 9; }

/* Two-column design-decision comparison with a compact carousel. */
.cs-decision-grid { margin-top: 44px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.cs-decision-card { display: flex; min-width: 0; flex-direction: column; }
.cs-decision-card > .cs-device,
.cs-carousel-stage { width: 100%; aspect-ratio: 1 / 1; }
.cs-carousel-slide { display: none; }
.cs-carousel-slide.is-active { display: block; }
.cs-carousel-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 34px;
  border: 1px solid var(--portfolio-border-muted);
  border-top: 0;
  color: var(--portfolio-fg-muted);
  font-family: var(--cs-mono);
  font-size: 11px;
}
.cs-carousel-controls button {
  align-self: stretch;
  width: 38px;
  border: 0;
  background: transparent;
  color: var(--portfolio-fg-muted);
  cursor: pointer;
}
.cs-carousel-controls button:hover { background: var(--portfolio-bg-muted); color: var(--portfolio-fg); }
.cs-carousel-controls button:disabled { opacity: .35; background: transparent; color: var(--portfolio-fg-muted); }
.cs-carousel-progress {
  display: grid;
  grid-template-columns: repeat(var(--carousel-steps), 1fr);
  gap: 5px;
  padding: 9px 10px 0;
  border: 1px solid var(--portfolio-border-muted);
  border-bottom: 0;
  background: var(--portfolio-bg);
}
.cs-carousel-progress-step {
  position: relative;
  height: 3px;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: 999px;
  background: var(--portfolio-border-muted);
  cursor: pointer;
}
.cs-carousel-progress-step::after {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--cs-accent);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
}
.cs-carousel-progress-step.is-complete::after { transform: scaleX(1); }
.cs-carousel-progress-step.is-static::after { transform: scaleX(1); }
.cs-carousel.is-running .cs-carousel-progress-step.is-current::after { animation: cs-carousel-progress var(--carousel-duration) linear forwards; }
@keyframes cs-carousel-progress { to { transform: scaleX(1); } }
.cs-decision-copy { display: flex; min-height: 150px; flex-direction: column; justify-content: flex-end; padding-top: 24px; }
.cs-decision-copy .cs-flow-num { margin-bottom: 8px; }

.cs-supporting-evidence { margin-top: 48px; border-top: 1px solid var(--portfolio-border-muted); }
.cs-supporting-evidence summary {
  padding: 14px 0;
  color: var(--portfolio-fg-muted);
  font-family: var(--cs-mono);
  font-size: 11px;
  letter-spacing: .05em;
  text-transform: uppercase;
  cursor: pointer;
}
.cs-supporting-evidence > .cs-figure { padding-top: 28px; }
.cs-supporting-evidence .cs-figure img { display: block; width: 100%; border: 1px solid var(--portfolio-border-muted); }
.cs-app-store-grid { padding-top: 12px; }

/* Theme-aware pairs. */
.cs .only-dark { display: none; }
[data-color-mode="dark"] .cs .only-light { display: none; }
[data-color-mode="dark"] .cs .only-dark { display: block; }

.cs-end { height: 96px; }

@media (max-width: 700px) {
  .cs-hero { padding-top: 48px; }
  .cs-meta { grid-template-columns: repeat(2, 1fr); gap: 28px 20px; }
  .cs-chapter { margin-top: 96px; }
  .cs-subsection { margin-top: 56px; }
  .cs-grid,
  .cs-grid.cols-2,
  .cs-grid-2,
  .cs-grid-3,
  .cs-decision-grid { grid-template-columns: 1fr; }
  .cs-grid { gap: 28px; }
  .cs-flow-step { flex-direction: column; gap: 20px; }
  .cs-flow-media,
  .cs-flow-step-wide .cs-flow-media { flex: 0 0 auto; width: 100%; max-width: none; }
  .cs-flow-text { min-height: 132px; }
  .cs-artifact-placeholder-device { aspect-ratio: 4 / 5; }
  .cs-decision-copy { min-height: 132px; }
  .cs-problem-illustration { padding: 24px 18px 20px; }
  .cs-problem-tools { grid-template-columns: repeat(2, 1fr); }
  .cs-problem-fragments { grid-template-columns: repeat(2, 1fr); }
  .cs-problem-outcome { align-items: flex-start; flex-direction: column; gap: 6px; }
  .cs-problem-outcome strong { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  .cs-media-controls { transition: none; }
  .cs-carousel.is-running .cs-carousel-progress-step.is-current::after { animation: none; transform: scaleX(1); }
}