/* Case study pages — layout inspired by long-form case study templates; tokens align with index.html */

:root {
  --ink: #1a1a1a;
  --soft-ink: #555;
  --muted: #767676;
  --accent: #4b2e83;
  --line: #e8e4de;
  --paper: #f5f4f1;
  --mono: "IBM Plex Mono", "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --font-heading: "Instrument Serif", serif;
  --grain-svg: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.55'/%3E%3C/svg%3E");
  /* Readable but lighter editorial tone */
  --case-heading: rgba(30, 28, 26, 0.86);
  --case-body: rgba(55, 52, 48, 0.68);
  --case-muted: rgba(110, 106, 100, 0.85);
  --case-label: rgba(120, 116, 110, 0.88);
  --case-accent-soft: rgb(107, 90, 150);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--case-body);
  font-family: Inter, Arial, sans-serif;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.7;
  mix-blend-mode: multiply;
  background-image: var(--grain-svg);
  background-size: 180px 180px;
}

.case-study-main {
  position: relative;
  z-index: 0;
  min-height: 100vh;
  padding: 7rem 0 4.5rem;
}

.case-study-container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.case-study-back {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 2.5rem;
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  color: var(--case-muted);
  text-decoration: none;
  animation: case-study-fade-in 0.45s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.case-study-back:hover,
.case-study-back:focus-visible {
  color: var(--case-accent-soft);
}

.case-study-back-arrow {
  display: inline-block;
  transition: transform 0.2s ease;
}

.case-study-back:hover .case-study-back-arrow,
.case-study-back:focus-visible .case-study-back-arrow {
  transform: translateX(-3px);
}

.case-study-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
  margin-bottom: 4rem;
}

@media (min-width: 768px) {
  .case-study-hero {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
  }
}

.case-study-hero-media {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 0;
  animation: case-study-fade-in 0.55s cubic-bezier(0.22, 1, 0.36, 1) 0.05s both;
}

.case-study-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  vertical-align: middle;
  background: #f3f3f3;
}

.case-study-hero-text {
  animation: case-study-fade-in 0.55s cubic-bezier(0.22, 1, 0.36, 1) 0.1s both;
}

.case-study-title {
  margin: 0 0 1rem;
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: clamp(1.85rem, 3.6vw, 2.95rem);
  line-height: 1.12;
  letter-spacing: -0.018em;
  color: var(--case-heading);
}

.case-study-tagline {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 400;
  font-style: italic;
  color: var(--case-muted);
  line-height: 1.55;
  letter-spacing: 0.01em;
}

.case-study-meta-strip {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  margin-bottom: 3rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

@media (min-width: 768px) {
  .case-study-meta-strip {
    flex-direction: row;
    align-items: center;
    gap: 0;
    padding-top: 1.25rem;
    padding-bottom: 1.25rem;
  }
}

.case-meta-item {
  display: flex;
  flex: 1;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 0;
  animation: case-study-fade-in 0.45s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.case-meta-item:nth-child(1) {
  animation-delay: 0.28s;
}

.case-meta-item:nth-child(2) {
  animation-delay: 0.36s;
}

.case-meta-item:nth-child(3) {
  animation-delay: 0.44s;
}

@media (min-width: 768px) {
  .case-meta-item {
    padding: 0;
  }

  .case-meta-item + .case-meta-item {
    padding-left: 1.5rem;
    border-left: 1px solid var(--line);
  }
}

.case-meta-item + .case-meta-item {
  border-top: 1px solid var(--line);
}

@media (min-width: 768px) {
  .case-meta-item + .case-meta-item {
    border-top: none;
  }
}

.case-meta-icon {
  flex-shrink: 0;
  color: var(--case-label);
  opacity: 0.82;
}

.case-meta-label {
  margin: 0 0 0.125rem;
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--case-label);
}

.case-meta-value {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  color: rgba(62, 58, 54, 0.82);
}

.case-study-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.75rem;
}

@media (min-width: 768px) {
  .case-study-columns {
    grid-template-columns: 1fr 1fr;
    column-gap: 4rem;
    row-gap: 3rem;
  }
}

.case-study-section {
  margin: 0;
}

.case-study-section h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 400;
  letter-spacing: -0.008em;
  color: var(--case-heading);
}

.case-study-section p {
  margin: 0 0 1rem;
  font-size: 0.96rem;
  font-weight: 400;
  line-height: 1.82;
  letter-spacing: 0.012em;
  color: var(--case-body);
}

.case-study-section p:last-child {
  margin-bottom: 0;
}

.case-study-site-footer {
  position: relative;
  z-index: 0;
  margin-top: 0;
  padding: 2rem 0 2.25rem;
  border-top: 1px solid rgba(26, 26, 26, 0.08);
}

.case-study-site-footer-inner {
  width: min(1100px, 92vw);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--case-muted);
}

@media (min-width: 640px) {
  .case-study-site-footer-inner {
    flex-direction: row;
  }
}

.case-study-site-footer a {
  color: var(--case-accent-soft);
  font-weight: 400;
  text-decoration: none;
}

.case-study-site-footer a:hover,
.case-study-site-footer a:focus-visible {
  text-decoration: underline;
}

@keyframes case-study-fade-in {
  from {
    opacity: 0;
    transform: translate3d(0, 12px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .case-study-back,
  .case-study-hero-media,
  .case-study-hero-text,
  .case-meta-item,
  .case-meta-item:nth-child(1),
  .case-meta-item:nth-child(2),
  .case-meta-item:nth-child(3) {
    animation: none;
  }

  .case-study-back:hover .case-study-back-arrow {
    transform: none;
  }
}

/* Cross-document view transitions from index (Chromium; same rules as index.html). */
@view-transition {
  navigation: auto;
}

@media (prefers-reduced-motion: reduce) {
  @view-transition {
    navigation: none;
  }
}

@supports (view-transition-name: none) {
  .case-vt-institutional-lms .case-study-hero-media img {
    view-transition-name: case-vt-cover-institutional-lms;
  }

  .case-vt-engineering-leadership .case-study-hero-media img {
    view-transition-name: case-vt-cover-engineering-leadership;
  }

  .case-vt-workshops-office-hours .case-study-hero-media img {
    view-transition-name: case-vt-cover-workshops-office-hours;
  }

  .case-vt-wordpress-multisite .case-study-hero-media img {
    view-transition-name: case-vt-cover-wordpress-multisite;
  }
}

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 420ms;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

::view-transition-group(case-vt-cover-institutional-lms),
::view-transition-group(case-vt-cover-engineering-leadership),
::view-transition-group(case-vt-cover-workshops-office-hours),
::view-transition-group(case-vt-cover-wordpress-multisite) {
  animation-duration: 550ms;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

::view-transition-old(case-vt-cover-institutional-lms),
::view-transition-new(case-vt-cover-institutional-lms),
::view-transition-old(case-vt-cover-engineering-leadership),
::view-transition-new(case-vt-cover-engineering-leadership),
::view-transition-old(case-vt-cover-workshops-office-hours),
::view-transition-new(case-vt-cover-workshops-office-hours),
::view-transition-old(case-vt-cover-wordpress-multisite),
::view-transition-new(case-vt-cover-wordpress-multisite) {
  animation-duration: 550ms;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}