/* ============================================================
   CASE STUDIES — Card layouts for the 5 case studies
   ============================================================ */

/* --- Sticky navigation pills --- */
.cs-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--petri-bg, #FAF7F2);
  border-bottom: 1px solid var(--petri-border, #DDD5C8);
  padding: 10px 0;
  margin: 2rem 0 0.5rem;
}

.cs-nav__list {
  display: flex;
  justify-content: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.cs-nav__pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--petri-text-secondary, #6B5E4F);
  text-decoration: none;
  background: transparent;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.cs-nav__pill:hover {
  background: var(--petri-surface, #F2EDE4);
  color: var(--petri-text, #2C2416);
}

.cs-nav__pill--active {
  background: var(--petri-accent, #2D8F6F);
  color: #fff;
  border-color: var(--petri-accent, #2D8F6F);
}

.cs-nav__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.2rem;
  height: 1.2rem;
  border-radius: 50%;
  font-size: 0.65rem;
  font-weight: 700;
  background: rgba(0,0,0,0.08);
  color: inherit;
}

.cs-nav__pill--active .cs-nav__num {
  background: rgba(255,255,255,0.25);
}

/* --- Shared case study card --- */
.cs-card {
  background: var(--petri-surface, #F2EDE4);
  border-top: 1px solid var(--petri-border, #DDD5C8);
  border-bottom: 1px solid var(--petri-border, #DDD5C8);
  padding: 2.5rem 0;
  margin: 2.5rem 0;
}

.cs-card__header {
  max-width: 850px;
  margin: 0 auto;
  padding: 0 1rem;
}

.cs-card__number {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--petri-accent, #2D8F6F);
}

.cs-card__title {
  font-family: 'DM Serif Display', Georgia, serif;
  font-size: 1.45rem;
  font-weight: 400;
  color: var(--petri-text, #2C2416);
  margin: 0.25rem 0 0.5rem;
}

.cs-card__variable {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.85rem;
  color: var(--petri-text-muted, #9A8E7F);
}

.cs-card__variable code {
  background: var(--petri-code-bg, #F0EBE1);
  padding: 0.1em 0.3em;
  border-radius: 3px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
}

.cs-card__body {
  max-width: 960px;
  margin: 1.5rem auto 0;
  padding: 0 1rem;
}

.cs-card__text {
  max-width: 850px;
  margin: 1.5rem auto;
}

.cs-card__text p {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--petri-text, #2C2416);
}

/* --- Card footer with CTA --- */
.cs-card__footer {
  max-width: 850px;
  margin: 1.5rem auto 0;
  padding: 0 1rem;
  text-align: center;
}

.cs-card__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.4rem;
  background: var(--petri-accent, #2D8F6F);
  color: #fff;
  border-radius: 6px;
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s, transform 0.15s;
}

.cs-card__cta:hover {
  background: var(--petri-accent-dark, #1E6B50);
  color: #fff;
  transform: translateY(-1px);
}

/* --- CS1: Growth gate composite figure (built in situ) --- */
.gg-composite {
  max-width: 960px;
  margin: 1.5rem auto;
}

.gg-row {
  margin-bottom: 12px;
}

.gg-row-regimes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.gg-row-perturbations {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.gg-panel {
  text-align: center;
}

.gg-label {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--petri-text, #2C2416);
  padding: 6px 0;
  border-radius: 4px 4px 0 0;
}

.gg-panel img {
  width: 100%;
  display: block;
  border-radius: 0 0 4px 4px;
}

.gg-params {
  font-family: 'JetBrains Mono', 'SF Mono', monospace;
  font-size: 0.72rem;
  color: var(--petri-text-muted, #9A8E7F);
  margin-top: 4px;
  letter-spacing: 0.02em;
}

.gg-row-succession {
  position: relative;
}

.gg-succession-label {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--petri-text-secondary, #6B5E4F);
  margin-bottom: 6px;
}

.gg-succession-strip {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 3px;
}

.gg-succ-frame {
  text-align: center;
}

.gg-succ-frame img {
  width: 100%;
  display: block;
  border-radius: 3px;
}

.gg-succ-frame span {
  display: block;
  font-family: 'JetBrains Mono', 'SF Mono', monospace;
  font-size: 0.7rem;
  color: var(--petri-text-muted, #9A8E7F);
  margin-top: 2px;
}

@media (max-width: 768px) {
  .gg-succession-strip {
    grid-template-columns: repeat(5, 1fr);
  }
}

@media (max-width: 600px) {
  .gg-row-regimes {
    grid-template-columns: 1fr;
    max-width: 320px;
    margin: 0 auto;
  }

  .gg-row-perturbations {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* (biogeography mobile rules consolidated into the 768px block above) */

/* --- CS1: 3-column regime comparison --- */
.cs1-regimes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  max-width: 960px;
  margin: 1.5rem auto;
}

.cs1-regimes__panel {
  text-align: center;
}

.cs1-regimes__panel img {
  width: 100%;
  border-radius: 4px;
  border: 2px solid transparent;
}

.cs1-regimes__panel--highlight img {
  border-color: var(--petri-accent, #2D8F6F);
  box-shadow: 0 0 0 3px rgba(45, 143, 111, 0.15);
}

.cs1-regimes__panel h4 {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  margin: 0.6rem 0 0.2rem;
  color: var(--petri-text, #2C2416);
}

.cs1-regimes__panel p {
  font-size: 0.82rem;
  color: var(--petri-text-secondary, #6B5E4F);
  line-height: 1.45;
}

/* --- CS2: Triptych (3 panels) --- */
.cs2-triptych {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  max-width: 960px;
  margin: 1.5rem auto;
}

.cs2-triptych__panel img {
  width: 100%;
  border-radius: 4px;
}

.cs2-triptych__panel figcaption {
  text-align: center;
  font-size: 0.78rem;
  margin-top: 0.4rem;
}

/* --- CS3: Protocol timeline --- */
.cs3-protocol {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0.5rem;
  max-width: 850px;
  margin: 1.5rem auto;
}

.cs3-protocol__stage {
  flex: 1;
  max-width: 220px;
  text-align: center;
  padding: 1rem;
  background: var(--petri-bg, #FAF7F2);
  border-radius: 6px;
  border: 1px solid var(--petri-border, #DDD5C8);
}

.cs3-protocol__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--petri-accent, #2D8F6F);
  color: white;
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
}

.cs3-protocol__stage h4 {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  margin: 0.5rem 0 0.25rem;
}

.cs3-protocol__stage p {
  font-size: 0.78rem;
  color: var(--petri-text-secondary);
  line-height: 1.4;
  margin: 0;
}

.cs3-protocol__arrow {
  font-size: 1.3rem;
  color: var(--petri-text-muted);
  align-self: center;
  margin-top: 1rem;
}

.cs3-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.cs3-highlights img {
  width: 100%;
  border-radius: 4px;
}

/* Full 12-panel expandable */
.cs3-full-figure {
  max-width: 960px;
  margin: 1rem auto;
}

.cs3-full-figure summary {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--petri-accent);
  cursor: pointer;
  padding: 0.5rem 0;
}

.cs3-grid {
  display: grid;
  grid-template-columns: auto repeat(6, 1fr);
  gap: 0.4rem;
  align-items: center;
  margin-top: 0.5rem;
}

.cs3-grid__label {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--petri-text-muted);
  text-align: right;
  padding-right: 0.5rem;
}

.cs3-grid img {
  width: 100%;
  border-radius: 2px;
}

/* --- CS4: Optimizer matrix --- */
.cs4-matrix {
  display: grid;
  grid-template-columns: 80px repeat(3, 1fr);
  gap: 0.75rem;
  max-width: 850px;
  margin: 1.5rem auto;
  align-items: center;
}

.cs4-matrix__col-head {
  text-align: center;
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--petri-border, #DDD5C8);
}

.cs4-matrix__row-head {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--petri-text-muted);
  text-align: right;
  padding-right: 0.5rem;
}

.cs4-matrix img {
  width: 100%;
  border-radius: 4px;
  border: 1px solid var(--petri-border, #DDD5C8);
}

/* --- CS5: 18-panel biogeography grid (6 cols × 3 rows + row labels) --- */
.cs5-grid-18 {
  display: grid;
  grid-template-columns: auto repeat(6, 1fr);
  gap: 4px;
  max-width: 960px;
  margin: 1.5rem auto;
  align-items: start;
}

.cs5-row-label {
  grid-column: 1;
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--petri-text-muted, #9A8E7F);
  writing-mode: vertical-lr;
  transform: rotate(180deg);
  text-align: center;
  padding: 0 4px;
  align-self: center;
  letter-spacing: 0.02em;
}

.cs5-panel {
  text-align: center;
}

.cs5-panel img {
  width: 100%;
  border-radius: 3px;
  display: block;
}

.cs5-panel span {
  display: block;
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.58rem;
  color: var(--petri-text-muted, #9A8E7F);
  margin-top: 2px;
  line-height: 1.3;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .cs-nav__list {
    justify-content: flex-start;
    padding: 0 1rem;
  }

  .cs1-regimes,
  .cs2-triptych,
  .cs3-highlights {
    grid-template-columns: 1fr;
    max-width: 380px;
  }

  .cs3-protocol {
    flex-direction: column;
    align-items: center;
  }

  .cs3-protocol__arrow {
    transform: rotate(90deg);
    margin: 0;
  }

  .cs3-grid {
    grid-template-columns: auto repeat(3, 1fr);
  }

  .cs4-matrix {
    grid-template-columns: 60px repeat(3, 1fr);
    gap: 0.4rem;
  }

  .cs5-grid-18 {
    grid-template-columns: repeat(3, 1fr);
  }

  .cs5-row-label {
    grid-column: 1 / -1;
    writing-mode: horizontal-tb;
    transform: none;
    text-align: left;
    padding: 8px 0 2px;
    font-size: 0.72rem;
    border-bottom: 1px solid var(--petri-border, #DDD5C8);
    margin-bottom: 2px;
  }
}

@media (max-width: 420px) {
  .cs5-grid-18 {
    grid-template-columns: repeat(2, 1fr);
  }
}