/* =============================================
   CASE STUDY STYLES
   ============================================= */

/* Hero */
.cs-hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 5rem 2rem 4rem;
}

.cs-back {
  display: inline-block;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--ink-light);
  margin-bottom: 2rem;
  transition: color 0.2s;
}
.cs-back:hover { color: var(--rust); }

.cs-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 4.5vw, 3.6rem);
  font-weight: 300;
  line-height: 1.2;
  color: var(--ink);
  margin: 1rem 0 2.5rem;
}
.cs-hero h1 em {
  font-style: italic;
  color: var(--rust);
}

.cs-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border: 1px solid var(--beige-mid);
  background: var(--white);
  width: fit-content;
}

.cs-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 1rem 1.5rem;
  border-right: 1px solid var(--beige-mid);
  font-size: 0.9rem;
}
.cs-meta-item:last-child { border-right: none; }

.cs-meta-label {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-light);
}

@media (max-width: 640px) {
  .cs-hero { padding: 3.5rem 1.25rem 2.5rem; }
  .cs-hero-meta { flex-direction: column; width: 100%; }
  .cs-meta-item { border-right: none; border-bottom: 1px solid var(--beige-mid); }
  .cs-meta-item:last-child { border-bottom: none; }
}

/* Sections */
.cs-section {
  border-top: 1px solid var(--beige-mid);
  padding: 5rem 0;
}
.cs-section--tinted { background: var(--white); }
.cs-section--sage   { background: var(--sage-pale); border-top-color: var(--sage-light); }

.cs-section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 2rem;
}

@media (max-width: 640px) {
  .cs-section-inner { grid-template-columns: 1fr; }
  .cs-section { padding: 3rem 0; }
}

.cs-section-label {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--beige-dark);
  line-height: 1;
  padding-top: 0.3rem;
}

.cs-section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 0.5rem;
}

.cs-section-sub {
  font-size: 0.95rem;
  color: var(--ink-light);
  margin-bottom: 2.5rem;
}

/* Prompt block */
.cs-prompt-block {
  background: var(--beige);
  border-left: 3px solid var(--rust);
  padding: 1.5rem 2rem;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-style: italic;
  line-height: 1.7;
  color: var(--ink-mid);
}

/* ELI5 grid */
.cs-eli5-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1px;
  background: var(--beige-mid);
  border: 1px solid var(--beige-mid);
}

.cs-eli5-card {
  background: var(--beige);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.cs-section--tinted .cs-eli5-card { background: var(--white); }

.cs-eli5-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.cs-eli5-card h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--ink);
}

.cs-eli5-card p {
  font-size: 0.92rem;
  color: var(--ink-mid);
  line-height: 1.65;
}

/* What's next */
.cs-next-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--beige-mid);
  border: 1px solid var(--beige-mid);
}

.cs-next-item {
  background: var(--white);
  padding: 1.5rem 2rem;
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 560px) {
  .cs-next-item { grid-template-columns: 1fr; gap: 0.5rem; }
}

.cs-next-tag {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sage);
  padding-top: 0.2rem;
}

.cs-next-item p {
  font-size: 0.95rem;
  color: var(--ink-mid);
  line-height: 1.65;
}

/* Feedback form */
.cs-feedback-form {
  background: var(--white);
  border: 1px solid var(--sage-light);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 680px;
}

.cs-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 560px) {
  .cs-form-row { grid-template-columns: 1fr; }
  .cs-feedback-form { padding: 1.5rem; }
}

.cs-form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.cs-form-group label {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-mid);
}

.cs-form-optional {
  text-transform: none;
  letter-spacing: 0;
  color: var(--ink-light);
  font-size: 0.75rem;
}

.cs-form-group input,
.cs-form-group textarea {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--beige);
  border: 1px solid var(--beige-dark);
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.2s;
  resize: vertical;
}

.cs-form-group input:focus,
.cs-form-group textarea:focus {
  border-color: var(--sage);
}

/* Reaction radio group */
.cs-reaction-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.cs-reaction-option {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  color: var(--ink-mid);
  background: var(--beige);
  border: 1px solid var(--beige-dark);
  padding: 0.4rem 0.9rem;
  border-radius: 2px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.cs-reaction-option:has(input:checked) {
  border-color: var(--sage);
  background: var(--sage-pale);
  color: var(--ink);
}

.cs-reaction-option input {
  display: none;
}

/* Submit */
.cs-form-footer {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.cs-submit-btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--rust);
  border: none;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s;
}
.cs-submit-btn:hover:not(:disabled) { background: var(--rust-light); }
.cs-submit-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.cs-form-note {
  font-size: 0.78rem;
  color: var(--ink-light);
}

.cs-form-success {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-style: italic;
  color: var(--sage);
  padding: 1.5rem 0;
}