/* ============================================================
   TILLFORGE — CASE STUDY PAGE
   ============================================================ */

/* ---- CASE STUDY HERO -------------------------------------- */

.cs-hero {
  background: var(--clr-surface);
  padding-top: calc(var(--nav-h) + var(--sp-16));
  padding-bottom: 0;
  position: relative;
  overflow: hidden;
}

/* Subtle radial glow */
.cs-hero::after {
  content: '';
  position: absolute;
  top: 0; right: -10%;
  width: 55vw;
  height: 55vw;
  background: radial-gradient(ellipse,
    rgba(233, 69, 96, 0.06) 0%, transparent 65%);
  pointer-events: none;
}

.cs-hero__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-bottom: var(--sp-8);
}

.cs-hero h1 {
  font-size: clamp(2rem, 4vw + 0.5rem, 3rem);
  margin-bottom: var(--sp-6);
  max-width: 20ch;
}

.cs-hero__tagline {
  font-size: var(--type-lead);
  color: var(--clr-white-dim);
  max-width: 58ch;
  margin-bottom: var(--sp-10);
}

.cs-hero__links {
  display: flex;
  gap: var(--sp-4);
  flex-wrap: wrap;
  margin-bottom: var(--sp-12);
}

/* Screenshot strip */
.cs-hero__screenshot {
  position: relative;
  margin-top: var(--sp-10);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  overflow: hidden;
  border: var(--border-subtle);
  border-bottom: none;
  background: var(--clr-surface-2);
  min-height: 320px;
}

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

.cs-hero__screenshot-placeholder {
  width: 100%;
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--sp-4);
  background: linear-gradient(160deg, var(--clr-surface-2) 0%, var(--clr-surface) 100%);
  position: relative;
  overflow: hidden;
}

.cs-hero__screenshot-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(233, 69, 96, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 69, 96, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
}

.cs-hero__screenshot-label {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: var(--type-xs);
  color: var(--clr-slate-light);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* ---- CASE STUDY BODY -------------------------------------- */

.cs-body {
  padding-block: var(--section-gap);
}

.cs-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--sp-16);
  align-items: start;
}

/* ---- SECTIONS --------------------------------------------- */

.cs-section {
  margin-bottom: var(--sp-16);
}

.cs-section:last-child { margin-bottom: 0; }

.cs-section__label {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--font-mono);
  font-size: var(--type-xs);
  color: var(--clr-red);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--sp-5);
}

.cs-section__label::before {
  content: '';
  display: block;
  width: 20px;
  height: 1px;
  background: var(--clr-red);
  opacity: 0.6;
}

.cs-section h2 {
  font-size: var(--type-h3);
  margin-bottom: var(--sp-5);
}

.cs-section p {
  color: var(--clr-white-dim);
  margin-bottom: var(--sp-4);
  max-width: 68ch;
}

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

/* Feature list */
.cs-features {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
}

.cs-feature {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-4);
  padding: var(--sp-4) var(--sp-5);
  background: var(--clr-surface-2);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: var(--type-sm);
  color: var(--clr-white-dim);
  line-height: var(--leading-snug);
  transition: border-color var(--dur-fast);
}

.cs-feature:hover { border-color: rgba(233, 69, 96, 0.18); }

.cs-feature::before {
  content: '→';
  color: var(--clr-red);
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.8em;
  margin-top: 1px;
}

/* Screenshot gallery */
.cs-gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-4);
  margin-top: var(--sp-6);
}

.cs-gallery__item {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--clr-surface-2);
  border: var(--border-subtle);
  aspect-ratio: 16/9;
  transition: border-color var(--dur-fast), transform var(--dur-base);
}

.cs-gallery__item:hover {
  border-color: rgba(233, 69, 96, 0.2);
  transform: scale(1.01);
}

.cs-gallery__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cs-gallery__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--clr-surface-2) 0%, var(--clr-surface) 100%);
  font-family: var(--font-mono);
  font-size: var(--type-xs);
  color: var(--clr-slate);
  text-align: center;
  padding: var(--sp-4);
}

.cs-gallery__item--wide {
  grid-column: 1 / -1;
  aspect-ratio: 21/9;
}

/* Tech badges */
.cs-tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
}

.cs-tech-badge {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--type-xs);
  font-weight: 500;
  padding: 0.4rem 0.9rem;
  background: var(--clr-surface-2);
  border: var(--border-dim);
  border-radius: var(--radius-full);
  color: var(--clr-white-dim);
  letter-spacing: 0.04em;
  transition: border-color var(--dur-fast), color var(--dur-fast);
}

.cs-tech-badge:hover {
  border-color: rgba(233, 69, 96, 0.3);
  color: var(--clr-red);
}

/* Testimonial block */
.cs-testimonial {
  background: var(--clr-surface-2);
  border-left: 3px solid var(--clr-amber);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: var(--sp-8);
  margin-top: var(--sp-6);
}

.cs-testimonial__quote {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--clr-white);
  line-height: var(--leading-snug);
  margin-bottom: var(--sp-6);
}

.cs-testimonial__author {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.cs-testimonial__avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--clr-surface);
  border: var(--border-amber);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--clr-amber);
  flex-shrink: 0;
}

.cs-testimonial__name {
  font-weight: 600;
  font-size: var(--type-sm);
  color: var(--clr-white);
}

.cs-testimonial__role {
  font-size: var(--type-xs);
  color: var(--clr-slate-light);
  margin-top: 2px;
}

/* ---- SIDEBAR --------------------------------------------- */

.cs-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + var(--sp-8));
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

.cs-meta-card {
  background: var(--clr-surface-2);
  border: var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
}

.cs-meta-card__heading {
  font-family: var(--font-mono);
  font-size: var(--type-xs);
  color: var(--clr-red);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--sp-5);
  padding-bottom: var(--sp-4);
  border-bottom: var(--border-subtle);
}

.cs-meta-row {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
  padding-block: var(--sp-3);
  border-bottom: var(--border-subtle);
}

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

.cs-meta-label {
  font-family: var(--font-mono);
  font-size: var(--type-xs);
  color: var(--clr-slate-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.cs-meta-value {
  font-size: var(--type-sm);
  font-weight: 500;
  color: var(--clr-white);
}

.cs-meta-value a {
  color: var(--clr-red);
  text-decoration: none;
  word-break: break-all;
}

.cs-meta-value a:hover { text-decoration: underline; }

/* ---- NEXT / PREV NAVIGATION ------------------------------ */

.cs-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-5);
  margin-top: var(--sp-16);
  padding-top: var(--sp-10);
  border-top: var(--border-subtle);
}

.cs-nav__item {
  background: var(--clr-surface-2);
  border: var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  transition: border-color var(--dur-base), transform var(--dur-base);
}

.cs-nav__item:hover {
  border-color: rgba(233, 69, 96, 0.2);
  transform: translateY(-2px);
}

.cs-nav__item--next { text-align: right; }

.cs-nav__direction {
  font-family: var(--font-mono);
  font-size: var(--type-xs);
  color: var(--clr-slate-light);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.cs-nav__item--next .cs-nav__direction { justify-content: flex-end; }

.cs-nav__title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--clr-white);
  transition: color var(--dur-fast);
}

.cs-nav__item:hover .cs-nav__title { color: var(--clr-red); }

.cs-nav__type {
  font-size: var(--type-xs);
  color: var(--clr-slate-light);
  font-family: var(--font-mono);
}

/* ---- RESPONSIVE ------------------------------------------ */

@media (max-width: 900px) {
  .cs-layout {
    grid-template-columns: 1fr;
  }
  .cs-sidebar {
    position: static;
    order: -1;
  }
  .cs-gallery {
    grid-template-columns: 1fr;
  }
  .cs-gallery__item--wide { aspect-ratio: 16/9; }
}

@media (max-width: 600px) {
  .cs-nav { grid-template-columns: 1fr; }
}