/* ===================== PROJECTS / CASE STUDIES ===================== */

.projects-header{ text-align:center; margin-bottom: 40px; }
.projects-header .label{ margin-bottom: 8px; }
.projects-header h1{ font-size: clamp(28px, 4.4vw, 44px); }
.projects-header p{ max-width: 560px; margin: 14px auto 0; color: var(--ink-soft); font-size: 16px; line-height:1.6; }

/* ---------- filter chips (level-select) ---------- */
.project-filters{
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 44px;
}
.filter-chip{
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--ink);
  border-radius: 20px;
  padding: 7px 16px;
  transition: background .2s ease, color .2s ease, transform .15s ease;
}
.filter-chip:hover{ transform: translateY(-2px); }
.filter-chip.is-active{ background: var(--ink); color: var(--paper); }

.project-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 48px 32px;
}
@media (max-width: 800px){
  .project-grid{ grid-template-columns: 1fr; }
}

.project-card{
  position: relative;
  transition: opacity .35s ease, transform .35s ease;
}
.project-card.is-hidden{
  opacity: 0;
  transform: scale(.92);
  height: 0;
  margin: 0;
  overflow: hidden;
  pointer-events: none;
}

/* ---------- folder-card: an actual folder-icon silhouette, tab fused to body ---------- */
.folder-card{ perspective: 1300px; }

.folder-lid{
  position: relative;
  transform-origin: 50% 100%;
  transition: transform .5s cubic-bezier(.34,1.56,.64,1);
}
.folder-card:hover .folder-lid{ transform: translateY(-5px); }
.folder-card.is-open .folder-lid{
  transform: rotateX(-14deg) translateY(-10px);
}

.folder-tab{
  display: block;
  width: fit-content;
  min-width: 128px;
  margin: 0 0 0 22px;
  padding: 9px 20px 13px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: .07em;
  font-weight: 700;
  color: rgba(255,255,255,.95);
  background: var(--fc, var(--stamp-red));
  border-radius: 10px 10px 0 0;
}

.folder-front{
  position: relative;
  background: linear-gradient(160deg, var(--fc, var(--stamp-red)) 0%, color-mix(in srgb, var(--fc, var(--stamp-red)) 76%, black) 100%);
  border-radius: 3px 18px 18px 18px;
  box-shadow: 0 12px 24px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.3);
  padding: 10px;
  cursor: pointer;
  transition: box-shadow .3s ease;
}
.folder-card:hover .folder-front{ box-shadow: 0 18px 30px rgba(0,0,0,0.24), inset 0 1px 0 rgba(255,255,255,0.3); }
.folder-card.is-open .folder-front{ box-shadow: 0 32px 46px rgba(0,0,0,0.28), inset 0 1px 0 rgba(255,255,255,0.3); }

.folder-paper{
  position: relative;
  background: #fffdf9;
  border-radius: 2px 14px 14px 14px;
  padding: 22px 24px 20px;
  box-shadow: inset 0 2px 6px rgba(0,0,0,0.06);
}

.proj-top{
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  gap: 12px;
  margin-bottom: 12px;
}
.proj-stat{
  text-align: right;
  flex-shrink: 0;
}
.stat-value{
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.stat-label{
  display: block;
  font-family: var(--font-mono);
  font-size: 9.5px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  margin-top: 3px;
}

.project-card h3{
  font-size: 22px;
  margin-bottom: 6px;
}
.project-card .proj-company{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 18px;
}
.project-toggle{
  margin-top: 6px;
}
.project-case{
  max-height: 0;
  overflow: hidden;
  background: var(--paper);
  border-radius: 0 0 10px 10px;
  transition: max-height .5s ease;
}
.project-case.open{ max-height: 900px; }
.project-case-inner{
  padding: 30px 26px 26px;
  border-top: 1px dashed var(--line);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px 22px;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity .4s ease .1s, transform .4s ease .1s;
}
@media (max-width: 620px){
  .project-case-inner{ grid-template-columns: 1fr; }
}
.project-case.open .project-case-inner{
  opacity: 1;
  transform: translateY(0);
}

/* ---------- sticky-note style case-study blocks ---------- */
.pc-block{
  position: relative;
  background:
    repeating-linear-gradient(to bottom, transparent, transparent 21px, rgba(58,90,140,0.13) 22px),
    #fffdf9;
  border-radius: 2px;
  padding: 20px 16px 16px 30px;
  box-shadow: 0 10px 18px rgba(0,0,0,0.12), 0 1px 0 rgba(0,0,0,0.03);
  transform: rotate(var(--tilt, -1deg));
  transition: transform .25s ease, box-shadow .25s ease;
}
.pc-block:hover{
  transform: rotate(0deg) translateY(-3px) scale(1.02);
  box-shadow: 0 18px 28px rgba(0,0,0,0.18);
  z-index: 2;
}
.pc-block::before{
  content: '';
  position: absolute;
  left: 22px; top: 0; bottom: 0;
  width: 1px;
  background: rgba(181,82,58,0.3);
}
.pc-block::after{
  content: '';
  position: absolute;
  top: -10px; left: 18px;
  width: 52px; height: 20px;
  background: var(--tape, var(--stampc-blue));
  opacity: .85;
  transform: rotate(-4deg);
  box-shadow: 0 3px 6px rgba(0,0,0,0.18);
  border-radius: 1px;
}
.pc-block:nth-child(4n+1){ --tilt: -1.4deg; --tape: var(--stampc-blue); }
.pc-block:nth-child(4n+2){ --tilt: 1.1deg;  --tape: var(--stampc-green); }
.pc-block:nth-child(4n+3){ --tilt: -0.8deg; --tape: var(--stampc-mustard); }
.pc-block:nth-child(4n+4){ --tilt: 1.5deg;  --tape: var(--stampc-red); }
.pc-block .label{ margin-bottom: 5px; }
.pc-block p{ margin:0; font-size: 14px; line-height:1.55; color: var(--ink-soft); }

.pc-event-list{
  list-style: none;
  margin: 2px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.pc-event-list a{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  color: var(--ink);
  border-bottom: 1px dashed var(--line);
  padding: 6px 2px;
  transition: color .2s ease, border-color .2s ease;
}
.pc-event-list a:hover{ color: var(--stamp-red); border-color: var(--stamp-red); }
.pc-event-list a span{
  flex-shrink: 1;
  min-width: 0;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}

.pc-map-link{
  display: inline-block;
  grid-column: 1 / -1;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--stamp-red);
  border-bottom: 1px solid var(--stamp-red);
}

.more-work{ margin-top: 90px; }
.link-groups{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
}
@media (max-width: 800px){
  .link-groups{ grid-template-columns: 1fr; }
}
.link-group h3{
  font-size: 16px;
  margin-bottom: 12px;
}
.link-group .pc-event-list a{
  font-size: 13.5px;
}