/* ============================
   CASE STUDY PAGE
   ============================ */

/* Back link — replaces logo in nav */
.nav__back {
  transition: color 0.2s, letter-spacing 0.2s;
}
.nav__back:hover {
  color: var(--blue-mid);
  letter-spacing: 0.01em;
}

/* Hero */
.cs-hero {
  padding-top: 60px;
  width: 100%;
}
.cs-hero__img {
  width: 100%;
  height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  view-transition-name: case-hero;
}
.cs-hero__icon {
  font-size: 72px;
  opacity: 0.4;
  color: var(--blue-dark);
}

/* Overview */
.cs-overview__grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 80px;
  align-items: start;
  padding-top: 24px;
}
.cs-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 700;
  color: var(--text);
  line-height: 1.05;
  margin: 12px 0 24px;
  letter-spacing: -0.02em;
}
.cs-lead {
  font-size: 18px;
  line-height: 1.75;
  color: var(--text-mid);
  max-width: 560px;
}

/* Meta sidebar */
.cs-overview__meta {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-left: 1px solid var(--border);
  padding-left: 40px;
  margin-top: 60px;
}
.cs-meta-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.cs-meta-item:first-child { padding-top: 0; }
.cs-meta-item:last-child { border-bottom: none; }
.cs-meta__label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-bottom: 6px;
}
.cs-meta__value {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
}

/* Content sections */
.cs-block {
  max-width: 680px;
}
.cs-section__title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.5vw, 40px);
  font-weight: 700;
  color: var(--text);
  margin: 14px 0 20px;
  letter-spacing: -0.01em;
}
.cs-body {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-mid);
}

/* Stats row */
.cs-highlights {
  display: flex;
  gap: 0;
  margin-top: 56px;
  border-top: 1px solid var(--border);
}
.cs-highlight {
  flex: 1;
  padding: 36px 32px;
  border-right: 1px solid var(--border);
}
.cs-highlight:last-child { border-right: none; }
.cs-highlight__num {
  display: block;
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 700;
  color: var(--blue-mid);
  letter-spacing: -0.03em;
  margin-bottom: 8px;
  line-height: 1;
}
.cs-highlight p {
  font-size: 13px;
  color: var(--text-mid);
  line-height: 1.5;
}

/* Screen placeholders */
.cs-screens {
  padding: 48px 0;
}
.cs-screens__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.cs-screens__grid--2 {
  grid-template-columns: 1fr 1fr;
}
.cs-screen-placeholder {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  aspect-ratio: 9/16;
  max-width: 260px;
  margin: 0 auto;
  width: 100%;
}
.cs-screen-placeholder--tall {
  aspect-ratio: 4/5;
  max-width: 100%;
}

/* Case hero cover image (natural ratio, no crop) */
.cs-hero__cover {
  width: 100%;
  height: auto;
  display: block;
}

/* Stacked full-width screens */
.cs-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Screen images */
.cs-screen-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
}

/* Sticky horizontal scroll carousel */
.cs-scroll-container {
  /* height set by JS: 100vh + total horizontal scroll distance */
}
.cs-scroll-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  background: var(--bg-alt);
}
.cs-scroll-row {
  display: flex;
  gap: 16px;
  overflow: hidden;
  padding: 0 40px;
  width: 100%;
  scrollbar-width: none;
}
.cs-scroll-row::-webkit-scrollbar {
  display: none;
}
.cs-scroll-img {
  flex: 0 0 auto;
  height: clamp(200px, 55vh, 520px);
  width: auto;
  max-width: none;
  display: block;
  border-radius: var(--radius-md);
}

/* Mobile — disable sticky, show as swipeable row */
@media (max-width: 768px) {
  .cs-scroll-container {
    height: auto !important;
  }
  .cs-scroll-sticky {
    position: static;
    height: auto;
    padding: 48px 0;
  }
  .cs-scroll-row {
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding: 0 24px 16px;
    gap: 12px;
  }
  .cs-scroll-img {
    height: auto;
    width: 80vw;
    max-width: 320px;
    scroll-snap-align: start;
  }
}

/* Full-bleed section */
.cs-full-bleed {
  padding: 80px 0;
  margin: 0;
}

/* Case nav */
.cs-nav-cases__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 40px 0;
  border-top: 1px solid var(--border);
}
.cs-nav-cases__next {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  color: var(--text-mid);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.cs-nav-cases__next strong {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0;
  text-transform: none;
}
.cs-nav-cases__next:hover strong {
  color: var(--blue-mid);
}

/* Mobile */
@media (max-width: 768px) {
  .cs-overview__grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .cs-overview__meta {
    border-left: none;
    padding-left: 0;
    border-top: 1px solid var(--border);
    padding-top: 32px;
    margin-top: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
  .cs-hero__img { height: 280px; }
  .cs-screens__grid { grid-template-columns: repeat(2, 1fr); }
  .cs-highlights { flex-direction: column; }
  .cs-highlight { border-right: none; border-bottom: 1px solid var(--border); }
  .cs-nav-cases__inner { flex-direction: column; gap: 24px; align-items: flex-start; }
}

/* Password lock screen (protected case study) */
.cs-lock {
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
}
.cs-lock__card {
  max-width: 440px;
  width: 100%;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 48px 36px;
  box-shadow: 0 20px 60px rgba(30, 60, 90, 0.08);
}
.cs-lock__icon { font-size: 42px; line-height: 1; margin-bottom: 18px; }
.cs-lock__title {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 12px;
}
.cs-lock__sub {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-mid);
  margin: 0 auto 28px;
  max-width: 34ch;
}
.cs-lock__form { display: flex; gap: 10px; }
.cs-lock__input {
  flex: 1;
  min-width: 0;
  font-family: inherit;
  font-size: 15px;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: 100px;
  background: var(--bg-alt);
  color: var(--text);
}
.cs-lock__input:focus { outline: none; border-color: var(--blue-mid); }
.cs-lock__btn {
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 12px 22px;
  border: none;
  border-radius: 100px;
  background: var(--blue-mid);
  color: #fff;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}
.cs-lock__btn:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(58, 158, 212, 0.3); }
.cs-lock__btn:focus-visible { outline: 2px solid var(--blue-mid); outline-offset: 2px; }
.cs-lock__error { color: #d1495b; font-size: 13px; margin: 14px 0 0; }
.cs-lock__back {
  display: inline-block;
  margin-top: 24px;
  font-size: 13px;
  color: var(--text-soft);
  text-decoration: none;
}
.cs-lock__back:hover { color: var(--blue-mid); }