/* ============================================================
   CASE STUDY PAGES — shared stylesheet
   Design: dark #130C25 bg, #FFD60A yellow, #F4EDD2 cream, #2149F1 blue
   GT Ultra Fine typeface (black/700/400)
   Left-aligned container, not centred
============================================================ */

/* === FONTS === */
@font-face {
  font-family: 'GT';
  src: url('../fonts/gtultrafine-black-webfont.woff2') format('woff2'),
       url('../fonts/gtultrafine-black-webfont.woff') format('woff');
  font-weight: 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'GT';
  src: url('../fonts/gtultrafine-bold-webfont.woff2') format('woff2'),
       url('../fonts/gtultrafine-bold-webfont.woff') format('woff');
  font-weight: 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'GT';
  src: url('../fonts/gtultrafine-regular-webfont.woff2') format('woff2'),
       url('../fonts/gtultrafine-regular-webfont.woff') format('woff');
  font-weight: 400; font-style: normal; font-display: swap;
}

/* === ROOT VARIABLES === */
:root {
  --bg:     #130C25;
  --yellow: #FFD60A;
  --cream:  #F4EDD2;
  --blue:   #2149F1;
  --muted:  rgba(244,237,210,0.5);
  --border: rgba(244,237,210,0.1);
}

/* === RESET === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'GT', Georgia, serif;
  background: var(--bg);
  color: var(--cream);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
p { margin: 0; }
figure { margin: 0; }
em { font-style: normal; }

/* === SKIP NAV === */
.skip-nav {
  position: absolute; left: -9999px; top: auto;
  width: 1px; height: 1px; overflow: hidden;
}
.skip-nav:focus {
  position: fixed; left: 1rem; top: 1rem;
  width: auto; height: auto;
  background: var(--yellow); color: var(--bg);
  padding: 0.5rem 1rem; font-weight: 700;
  z-index: 9999; border-radius: 2px;
}

/* === SIMPLIFIED NAV === */
.case-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2.5rem;
  border-bottom: 1px solid var(--border);
}
.case-back {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cream);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.18s;
}
.case-back:hover { color: var(--yellow); }
.case-back svg { flex-shrink: 0; }
.case-nav-logo {
  width: 60px;
  height: auto;
  filter: brightness(0) saturate(100%) invert(22%) sepia(95%) saturate(2200%) hue-rotate(223deg) brightness(98%) contrast(102%);
}

/* === CONTAINER — left-aligned, not centred === */
.case-container {
  max-width: 1200px;
  padding-left: 2.5rem;
  padding-right: 2.5rem;
}

/* === HERO === */
.case-hero {
  padding: 5rem 0 5rem;
  position: relative;
}
.case-hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 192px;
  height: 192px;
  background: url('../img/bg.png') no-repeat bottom right / contain;
  pointer-events: none;
  z-index: 0;
}
.case-category {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cream);
  opacity: 0.6;
  margin-bottom: 1.25rem;
}
.case-h1 {
  font-size: clamp(4rem, 8vw, 9rem);
  font-weight: 900;
  line-height: 0.88;
  letter-spacing: -0.03em;
  color: var(--yellow);
  margin-bottom: 2.25rem;
}
.case-intro {
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--cream);
  opacity: 0.82;
  max-width: 56ch;
  margin-bottom: 3rem;
}

/* === META === */
.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.case-meta-item dt {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cream);
  opacity: 0.6;
  margin-bottom: 0.3rem;
}
.case-meta-item dd {
  font-size: 0.95rem;
  color: var(--cream);
  font-weight: 400;
}

/* === SECTIONS — spreadsheet grid === */

/* Each section is a bordered cell; collapse adjacent top/bottom borders */
.case-section {
  border: 1px solid var(--border);
  margin-bottom: -1px;
  padding: 0;
}
.case-section:last-child { margin-bottom: 0; border-bottom: none; }

.case-section-grid { display: block; }

/* Section label */
.case-section-label {
  font-size: clamp(2.5rem, 5vw, 5rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  text-transform: lowercase;
  color: var(--blue);
  padding: 1.5rem 2.5rem;
}

/* Content area — generous padding for airy feel */
.case-section-content {
  padding: 2rem 3rem 4.5rem;
}
/* Top gap between label and copy */
.case-section-content::before {
  content: '';
  display: block;
  margin-bottom: 3rem;
}

.case-section-content > p {
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--cream);
  max-width: 65ch;
  margin-bottom: 1.1rem;
}
.case-section-content > p:last-child { margin-bottom: 0; }
.case-section-content em { color: var(--muted); }

/* === IMAGES === */

/* Single image, full width of content column */
.case-img {
  margin: 2.25rem 0;
}
.case-img img { width: 100%; }
.case-img figcaption {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.5rem;
}

/* 2-up grid */
.case-img-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 2.25rem 0;
  align-items: start;
}
.case-img-grid img { width: 100%; }
.case-img-grid figcaption {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

/* Light background container — for logos with white bg */
.case-img-light {
  background: #f0ede8;
  padding: 2.5rem;
  margin: 2.25rem 0;
}
.case-img-light img {
  max-width: 480px;
  margin: 0 auto;
}

/* Constrained width (e.g. email, social tiles) */
.case-img-narrow {
  max-width: 480px;
  margin: 2.25rem 0;
}
.case-img-narrow img { width: 100%; }

/* === INLINE LINKS / CTAs === */
.case-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--yellow);
  text-decoration: underline;
  text-underline-offset: 4px;
  margin: 1rem 0 0.5rem;
  transition: color 0.18s;
}
.case-cta:hover { color: var(--cream); }
.case-cta svg { flex-shrink: 0; }

/* === PROJECT NAV (prev / next) === */
.case-project-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2.5rem 2.5rem;
  max-width: 1200px;
  position: relative;
}
.case-project-nav::before {
  content: '';
  position: absolute;
  top: 0;
  left: 2.5rem;
  right: 2.5rem;
  border-top: 1px solid var(--border);
}
.case-project-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--cream);
  transition: color 0.18s;
}
.case-project-nav-link:hover { color: var(--yellow); }
.case-project-nav-link.next { margin-left: auto; }

/* === FOOTER === */
.case-footer {
  padding: 2.5rem 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.case-footer-logo {
  width: 44px;
  height: auto;
  filter: brightness(0) saturate(100%) invert(22%) sepia(95%) saturate(2200%) hue-rotate(223deg) brightness(98%) contrast(102%);
}
.case-footer-copy {
  font-size: 0.8rem;
  color: var(--muted);
}

/* === RESPONSIVE === */
@media (max-width: 860px) {
  .case-img-grid { grid-template-columns: 1fr; }
  .case-h1 { font-size: clamp(3rem, 13vw, 5rem); }
  .case-section-label {
    font-size: clamp(2rem, 8vw, 3rem);
    padding: 1rem 1.25rem;
  }
  .case-nav,
  .case-container,
  .case-footer,
  .case-project-nav { padding-left: 1.25rem; padding-right: 1.25rem; }
  .case-project-nav::before { left: 1.25rem; right: 1.25rem; }
  .case-hero { padding: 3rem 0 3.5rem; }
  .case-section-content { padding: 1.5rem 1.5rem 3rem; }
  .case-section-content::before { margin-bottom: 2rem; }
  .case-img-light { padding: 1.5rem; }
}

/* === SELECTION === */
::selection {
  background: var(--yellow);
  color: var(--bg);
}

/* === TEXT WRAP === */
.case-h1,
.case-section-label,
.case-intro {
  text-wrap: balance;
}

/* === SCROLL FADE === */
.case-section.fade-init {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.case-section.fade-init.visible {
  opacity: 1;
  transform: none;
}

/* === FOCUS VISIBLE === */
:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 3px;
  border-radius: 2px;
}

/* === LIGHT MODE === */
@media (prefers-color-scheme: light) {
  :root {
    --bg:     #F4EDD2;
    --cream:  #130C25;
    --muted:  rgba(19,12,37,0.5);
    --border: rgba(19,12,37,0.1);
    /* --blue and --yellow unchanged; yellow won't be used */
  }

  /* h1 was yellow; in light mode use signal red */
  .case-h1 { color: #D41F1F; }

  /* Hover states that were yellow → blue */
  .case-back:hover,
  .case-project-nav-link:hover { color: var(--blue); }

  /* CTAs were yellow → dark, hover → blue */
  .case-cta { color: var(--cream); }
  .case-cta:hover { color: var(--blue); }

  /* Logo: dark on cream (not blue) */
  .case-nav-logo,
  .case-footer-logo { filter: brightness(0); }

  /* Light-bg image container: white so it reads against cream */
  .case-img-light { background: #ffffff; }

  /* Selection: blue instead of yellow */
  ::selection { background: var(--blue); color: #F4EDD2; }

  /* Focus: blue instead of yellow */
  :focus-visible { outline-color: var(--blue); }
}

/* === REDUCED MOTION === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}