/* ============================================================
   PAGE HERO
============================================================ */
.proj-hero {
  padding-top: calc(var(--nav-h) + 3rem);
  padding-bottom: 3rem;
  position: relative;
  z-index: 1;
}

.proj-hero-title {
  font-size: clamp(3rem, 10vw, 7rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.055em;
  margin: 0.5rem 0 1.25rem;
}

.outline {
  -webkit-text-stroke: 2px var(--text-1);
  color: transparent;
}

.proj-hero-sub {
  font-size: 0.95rem;
  color: var(--text-2);
  max-width: 500px;
  line-height: 1.8;
}

/* ============================================================
   FILTER BAR
============================================================ */
.filter-bar {
  border-top: 1px solid var(--border-md);
  border-bottom: 1px solid var(--border-md);
  background: var(--bg-surface);
  padding: 0.7rem 0;
  transition: background 0.4s ease;
  position: relative;
  z-index: 100;
}

.sticky-filter {
  position: sticky;
  top: var(--nav-h);
  z-index: 100;
}

.filter-inner {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.filter-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-right: 0.35rem;
}

.filter-btn {
  --pointer-x: 50%;
  --pointer-y: 50%;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 5px 13px;
  border-radius: 100px;
  border: 1px solid var(--border-md);
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  letter-spacing: 0.03em;
  position: relative;
  overflow: hidden;
  transition: color var(--t), border-color var(--t), background var(--t), transform var(--t), box-shadow var(--t);
  isolation: isolate;
}

.filter-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at var(--pointer-x) var(--pointer-y), color-mix(in srgb, var(--accent) 20%, transparent), transparent 46%),
    linear-gradient(90deg, color-mix(in srgb, var(--accent) 9%, transparent), transparent);
  opacity: 0;
  transform: scaleX(0.72);
  transform-origin: left;
  transition: opacity var(--t), transform 0.28s var(--ease-out);
  pointer-events: none;
}

.filter-btn:hover {
  color: var(--text-1);
  border-color: var(--border-str);
  transform: translateY(-1px);
}

.filter-btn:hover::before,
.filter-btn:focus-visible::before {
  opacity: 1;
  transform: scaleX(1);
}

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 8px 18px color-mix(in srgb, var(--accent) 18%, transparent);
}

.filter-btn:active {
  transform: translateY(0) scale(0.97);
}

/* ============================================================
   PROJECT LIST
============================================================ */
.proj-list {
  padding: 2.3rem 0;
  position: relative;
  z-index: 1;
}

/* Mobile: stack media on top, content below */
.proj-item-inner {
  display: flex;
  flex-direction: column;
}

/* Media / diagram side */
.proj-media {
  background: var(--bg-surface);
  transition: background 0.4s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.2rem;
  border-bottom: 1px solid var(--border);
  min-height: 220px;
  position: relative;
}

/* ============================================================
   PROJECT DIAGRAM VISUALS
============================================================ */
.proj-img-placeholder {
  --media-x: 0px;
  --media-y: 0px;
  width: 100%;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
  transition: transform 0.42s var(--ease-out), box-shadow 0.42s var(--ease-out);
  background: color-mix(in srgb, var(--bg-card) 74%, var(--bg-surface));
}

.proj-img-placeholder:hover {
  transform: translateY(-2px);
}

.proj-img-placeholder.is-empty::after {
  content: 'Image coming soon';
  position: absolute;
  top: 10px;
  right: 11px;
  font-family: var(--font-mono);
  font-size: 0.56rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
  z-index: 1;
}

/* Real photo overlay — add image file to show it; hides via onerror if file missing */
.proj-photo-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-sm);
  opacity: 1;
  z-index: 0;
  transform: translate3d(var(--media-x), var(--media-y), 0) scale(1.04);
  transition: transform 0.55s cubic-bezier(0.16, 1, 0.3, 1), filter 0.45s ease;
}

.proj-photo-overlay[src=""] {
  display: none;
}

/* Gradient overlay that fades in on hover */
.proj-img-placeholder.has-photo::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-sm);
  background: linear-gradient(to top, rgba(0,0,0,0.42) 0%, transparent 55%);
  opacity: 0;
  transition: opacity 0.45s ease;
  z-index: 1;
  pointer-events: none;
}

.proj-img-placeholder.has-photo:hover::after {
  opacity: 1;
}

.proj-img-placeholder:hover .proj-photo-overlay {
  transform: translate3d(var(--media-x), var(--media-y), 0) scale(1.09);
  filter: brightness(1.08) saturate(1.12);
}

.project-feature-media {
  background:
    radial-gradient(circle at 20% 18%, color-mix(in srgb, var(--accent) 24%, transparent), transparent 30%),
    linear-gradient(135deg, var(--bg-surface), var(--bg-card));
}

.project-feature-media .proj-img-placeholder {
  box-shadow:
    0 18px 45px color-mix(in srgb, var(--accent) 18%, transparent),
    0 0 0 1px color-mix(in srgb, var(--accent) 24%, transparent),
    0 0 38px color-mix(in srgb, var(--accent) 14%, transparent);
}

.project-feature-media .proj-img-placeholder.has-photo::after {
  opacity: 1;
  background:
    linear-gradient(to top, rgba(0, 0, 0, 0.46), transparent 58%),
    linear-gradient(135deg, color-mix(in srgb, var(--accent) 24%, transparent), transparent 42%);
}

.project-feature-media .pv-docker,
.project-feature-media .pv-small {
  border-color: var(--accent-mid);
  color: var(--accent);
  background: var(--accent-light);
}

.proj-img-placeholder.has-photo .pv-diagram,
.proj-img-placeholder.has-photo .pv-stack {
  display: none;
}

.pv-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  position: relative;
  z-index: 1;
}

.pv-row {
  display: flex;
  gap: 5px;
  align-items: center;
}

.pv-box {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.04em;
  padding: 6px 12px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-str);
  background: var(--bg-card);
  color: var(--text-2);
  white-space: nowrap;
  transition: background 0.4s ease;
}

.pv-small { padding: 4px 9px; font-size: 0.6rem; }

.pv-arrow {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-3);
  letter-spacing: 0.04em;
}

.pv-arrow-v { font-size: 0.75rem; }

.pv-nginx, .pv-server  { border-color: var(--accent-mid); color: var(--accent); background: var(--accent-light); }
.pv-docker             { border-color: #93c5fd; color: #1d4ed8; background: #eff6ff; }
.pv-mqtt               { border-color: #c4b5fd; color: #6d28d9; background: #f5f3ff; }
.pv-internet           { border-color: var(--border-str); }

[data-theme="dark"] .pv-docker { border-color: #1e3a5f; color: #93c5fd; background: #0a1628; }
[data-theme="dark"] .pv-mqtt   { border-color: #2d1f4a; color: #c4b5fd; background: #1a1030; }

.pv-stack {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: center;
  position: relative;
  z-index: 1;
}

/* Background tints per project */
.pv-aws   { background: linear-gradient(145deg, var(--accent-light), var(--bg-surface)); }
.pv-net   { background: linear-gradient(145deg, #eff6ff, #e0e7f0); }
.pv-linux { background: linear-gradient(145deg, #fef9ec, #f5edd8); }
.pv-proxy { background: linear-gradient(145deg, #f3f0fb, #e8e2f5); }
.pv-iot   { background: linear-gradient(145deg, #f5f3ff, #ede8f8); }
.pv-web   { background: linear-gradient(145deg, #fff0f3, #f8e2ea); }

[data-theme="dark"] .pv-net   { background: linear-gradient(145deg, #0a1628, #161e2e); }
[data-theme="dark"] .pv-linux { background: linear-gradient(145deg, #1f1900, #2a2200); }
[data-theme="dark"] .pv-proxy { background: linear-gradient(145deg, #160d24, #1f1530); }
[data-theme="dark"] .pv-iot   { background: linear-gradient(145deg, #130d20, #1c1530); }
[data-theme="dark"] .pv-web   { background: linear-gradient(145deg, #1f0d12, #2c1520); }

/* ============================================================
   PROJECT CONTENT
============================================================ */
.proj-content {
  padding: 1.1rem 1.05rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  justify-content: center;
}

/* Failures & Corrections gets extra breathing room above */
.proj-block:nth-child(5) {
  margin-top: 0.3rem;
}

.proj-meta {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.proj-num {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-3);
  letter-spacing: 0.07em;
  margin-right: 1px;
}

.proj-badge {
  font-family: var(--font-mono);
  font-size: 0.56rem;
  padding: 2px 8px;
  border-radius: 100px;
  letter-spacing: 0.03em;
  transition: transform var(--t), filter var(--t), border-color var(--t);
}

.proj-badge:hover {
  transform: translateY(-1px);
  filter: saturate(1.08);
}

.badge-personal,
.badge-infra,
.badge-skil2,
.badge-wip,
.badge-foundation,
.badge-progress {
  background: color-mix(in srgb, var(--bg-card) 82%, var(--bg-surface));
  border: 1px solid var(--border-md);
  color: var(--text-2);
}

.badge-featured {
  background: var(--accent-light);
  border: 1px solid var(--accent-mid);
  color: var(--accent);
}

[data-theme="dark"] .badge-personal,
[data-theme="dark"] .badge-infra,
[data-theme="dark"] .badge-skil2,
[data-theme="dark"] .badge-wip,
[data-theme="dark"] .badge-foundation,
[data-theme="dark"] .badge-progress {
  background: color-mix(in srgb, var(--bg-card) 88%, var(--bg-surface));
  border-color: var(--border-md);
  color: var(--text-2);
}

[data-theme="dark"] .badge-featured {
  background: color-mix(in srgb, var(--accent-light) 72%, var(--bg-card));
  border-color: color-mix(in srgb, var(--accent) 32%, var(--accent-mid));
  color: var(--accent);
}

.proj-title {
  font-size: clamp(1.08rem, 2.95vw, 1.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.12;
}

.proj-block {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-left: 0.75rem;
  border-left: 2px solid var(--border-md);
  transition: border-color 0.2s ease;
}

.proj-block:hover {
  border-left-color: var(--accent-mid);
}

/* Skills block gets a top separator and stands apart */
.proj-block:last-child {
  margin-top: 0.4rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  border-left: none;
  padding-left: 0;
}

.proj-block-label {
  font-family: var(--font-mono);
  font-size: 0.69rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.proj-text {
  font-size: 0.78rem;
  color: var(--text-2);
  line-height: 1.56;
}

.proj-text code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--bg-surface);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--accent);
}

.proj-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 0.2rem;
}

.proj-skills span {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  padding: 2px 7px;
  border-radius: 100px;
  background: var(--bg-surface);
  border: 1px solid var(--border-md);
  color: var(--text-3);
  letter-spacing: 0.04em;
  position: relative;
  overflow: hidden;
  transition: border-color var(--t), color var(--t), background 0.4s ease, transform var(--t);
}

.proj-skills span:hover {
  border-color: var(--accent-mid);
  color: var(--accent);
  background: var(--accent-light);
  transform: translateY(-1px);
}

.proj-links {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
  margin-top: 0.1rem;
}

/* ============================================================
   SKILLS DEVELOPED BLOCK
============================================================ */
.proj-skills-developed {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-top: 2px;
}

.psd-row {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.psd-label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
}

.psd-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.psd-tag-tech {
  font-family: var(--font-mono);
  font-size: 0.56rem;
  padding: 2px 7px;
  border-radius: 100px;
  background: var(--accent-light);
  border: 1px solid var(--accent-mid);
  color: var(--accent);
  letter-spacing: 0.03em;
  transition: background 0.4s ease, transform var(--t), border-color var(--t);
}

.psd-tag-soft {
  font-family: var(--font-mono);
  font-size: 0.56rem;
  padding: 2px 7px;
  border-radius: 100px;
  background: #fff7ed;
  border: 1px solid #fed7aa;
  color: #9a3412;
  letter-spacing: 0.03em;
  transition: background 0.4s ease, transform var(--t), border-color var(--t);
}

.psd-tag-tech:hover,
.psd-tag-soft:hover {
  transform: translateY(-1px);
  border-color: currentColor;
}

[data-theme="dark"] .psd-tag-soft {
  background: #1c0f00;
  border-color: #4a2800;
  color: #fdba74;
}

/* ============================================================
   CTA
============================================================ */
.proj-cta {
  padding: 4rem 0;
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 1;
}

.cta-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-md);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  transition: background 0.4s ease;
}

.cta-inner h2 {
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: 0.35rem;
}

.cta-inner > div > p {
  font-size: 0.9rem;
  color: var(--text-2);
}

.cta-btns {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  flex-shrink: 0;
}

/* ============================================================
   RESPONSIVE — PROGRESSIVE ENHANCEMENT
============================================================ */

@media (min-width: 600px) {
  .cta-btns { flex-direction: row; flex-wrap: wrap; }
  .proj-skills-developed { flex-direction: row; gap: 1rem; }
  .psd-row { flex: 1; }
}

@media (min-width: 768px) {
  .proj-item-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 420px;
  }

  /* Flip layout for alternating items */
  .proj-item-flip {
    direction: rtl;
  }
  .proj-item-flip > * { direction: ltr; }

  .proj-media {
    border-bottom: none;
    border-right: 1px solid var(--border);
    min-height: unset;
    padding: 1.1rem;
  }

  .proj-item-flip .proj-media {
    border-right: none;
    border-left: 1px solid var(--border);
  }

  .proj-img-placeholder { min-height: 300px; }

  .proj-content { padding: 1.25rem 1.45rem; }

  .cta-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 2.5rem;
  }
}

@media (min-width: 1024px) {
  .proj-item-inner { min-height: 460px; }
  .proj-media { padding: 1.2rem; }
  .proj-img-placeholder { min-height: 370px; }
  .proj-content { padding: 1.45rem 1.8rem; }
  .cta-inner { padding: 3rem 3.5rem; }
}

/* ============================================================
   PROJECT CAROUSEL  (768 px + only)
============================================================ */
.proj-carousel { display: none; }

@media (min-width: 768px) {
  /* Swap: hide accordion+filter, show carousel */
  .sticky-filter { display: none; }
  .acc-list       { display: none; }
  .proj-carousel  { display: block; }

  .carousel-stage {
    display: grid;
    grid-template-columns: 42% 58%;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--bg-card);
    transition: background 0.4s ease;
    min-height: 560px;
  }

  /* ---- Left: image + controls ---- */
  .carousel-left {
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
  }

  .carousel-slides {
    flex: 1;
    position: relative;
    min-height: 0;
  }

  .car-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.48s ease;
    pointer-events: none;
  }
  .car-slide.is-active {
    opacity: 1;
    pointer-events: auto;
  }

  .car-slide .proj-media {
    height: 100%;
    min-height: unset;
    border-bottom: none;
    border-right: none;
    padding: 1.4rem;
  }
  .car-slide .proj-img-placeholder {
    height: 100%;
    min-height: unset;
    border-radius: var(--radius-sm);
  }

  .car-slide .proj-photo-overlay {
    object-fit: contain;
    padding: 0.55rem;
    background:
      radial-gradient(circle at 50% 34%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 46%),
      color-mix(in srgb, var(--bg-card) 78%, var(--bg-surface));
    transform: translate3d(calc(var(--media-x) * 0.35), calc(var(--media-y) * 0.35), 0) scale(0.99);
  }

  .car-slide .proj-img-placeholder:hover .proj-photo-overlay {
    transform: translate3d(calc(var(--media-x) * 0.35), calc(var(--media-y) * 0.35), 0) scale(1.01);
  }

  /* Controls row below image */
  .carousel-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.85rem 1.4rem;
    border-top: 1px solid var(--border);
    background: var(--bg-surface);
    transition: background 0.4s ease;
    flex-shrink: 0;
  }

  .car-arrow {
    --pointer-x: 50%;
    --pointer-y: 50%;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: 1px solid var(--border-md);
    background: var(--bg-card);
    color: var(--text-2);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color var(--t), color var(--t), background 0.2s ease, transform 0.15s ease;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
    isolation: isolate;
  }
  .car-arrow::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, color-mix(in srgb, var(--accent) 18%, transparent), transparent 58%);
    opacity: 0;
    transition: opacity var(--t);
  }
  .car-arrow:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-light);
  }
  .car-arrow:hover::before,
  .car-arrow:focus-visible::before { opacity: 1; }
  .car-arrow:active { transform: scale(0.92); }

  .car-counter {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-3);
    letter-spacing: 0.1em;
  }

  /* ---- Right: scrollable content ---- */
  .carousel-right {
    position: relative;
    overflow: hidden;
  }

  .carousel-contents {
    position: relative;
    height: 100%;
  }

  .car-content {
    position: absolute;
    inset: 0;
    overflow-y: auto;
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    transition: opacity 0.42s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.42s cubic-bezier(0.16, 1, 0.3, 1);
    scrollbar-width: thin;
    scrollbar-color: var(--border-str) transparent;
  }
  .car-content::-webkit-scrollbar { width: 4px; }
  .car-content::-webkit-scrollbar-track { background: transparent; }
  .car-content::-webkit-scrollbar-thumb { background: var(--border-str); border-radius: 2px; }

  .car-content.is-active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .car-content.is-leaving {
    opacity: 0;
    transform: translateY(-20px);
    pointer-events: none;
  }

  /* Content inside carousel */
  .car-content .proj-content {
    padding: 1.5rem 1.8rem;
  }
}

@media (min-width: 1024px) {
  .carousel-stage { min-height: 640px; }
  .car-content .proj-content { padding: 1.75rem 2.2rem; }
}

@media (max-width: 767px) {
  .proj-hero-sub {
    font-size: 1rem;
    line-height: 1.9;
  }

  .proj-content {
    padding: 1.45rem 1.2rem;
    gap: 0.9rem;
  }
}

/* ============================================================
   ACCORDION
============================================================ */

.acc-list {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-card);
  transition: background 0.4s ease;
}

.acc-item {
  border-bottom: 1px solid var(--border);
  transition: background 0.4s ease;
}

.acc-item.is-featured-project {
  position: relative;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--accent) 10%, transparent), transparent 38%),
    var(--bg-card);
}

.acc-item.is-featured-project::before {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-dim));
  opacity: 0.9;
  pointer-events: none;
}

.acc-item:last-child {
  border-bottom: none;
}

.acc-item.acc-filtered {
  display: none;
}

/* Open state — left accent rule */
.acc-item.is-open {
  border-left: 2px solid var(--accent);
}

/* Header row */
.acc-header {
  --pointer-x: 50%;
  --pointer-y: 50%;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1rem 1.2rem;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  position: relative;
  overflow: hidden;
  transition: background 0.18s ease, transform 0.24s var(--ease-out);
}

.acc-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--pointer-x) var(--pointer-y), color-mix(in srgb, var(--accent) 12%, transparent), transparent 44%);
  opacity: 0;
  transition: opacity var(--t);
  pointer-events: none;
}

.acc-header:hover {
  background: var(--bg-surface);
  transform: translateX(3px);
}

.acc-header:hover::before,
.acc-header:focus-visible::before {
  opacity: 1;
}

.acc-header:active {
  transform: translateX(1px) scale(0.995);
}

.acc-item.is-open .acc-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
}

.acc-num {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-3);
  letter-spacing: 0.07em;
  flex-shrink: 0;
  width: 2ch;
  transition: color var(--t), transform 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}

.acc-item.is-open .acc-num {
  color: var(--accent);
  transform: translateY(-1px);
}

.acc-header-main {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
}

.acc-title {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex-shrink: 1;
  min-width: 0;
  transition: color var(--t), transform 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}

.acc-item.is-open .acc-title {
  transform: translateX(2px);
}

.is-featured-project .acc-title {
  color: var(--accent);
}

.acc-badges {
  display: none;
  gap: 0.3rem;
  flex-shrink: 0;
}

.acc-stack {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-3);
  letter-spacing: 0.04em;
  flex-shrink: 0;
  white-space: nowrap;
  display: none;
}

.acc-toggle-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-3);
  margin-left: auto;
  transition: transform 0.38s cubic-bezier(0.16, 1, 0.3, 1), color 0.2s ease;
}

.acc-item.is-open .acc-toggle-icon {
  transform: rotate(45deg);
  color: var(--accent);
}

/* Body — grid trick for smooth height animation */
.acc-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.58s cubic-bezier(0.16, 1, 0.3, 1);
}

.acc-item.is-open .acc-body {
  grid-template-rows: 1fr;
}

.acc-body-inner {
  overflow: hidden;
}

/* Staggered content fade-in when opened */
@keyframes acc-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.acc-item.is-open .proj-content > * {
  animation: acc-in 0.48s cubic-bezier(0.16, 1, 0.3, 1) both;
}
.acc-item.is-open .proj-content > *:nth-child(1) { animation-delay: 0.07s; }
.acc-item.is-open .proj-content > *:nth-child(2) { animation-delay: 0.13s; }
.acc-item.is-open .proj-content > *:nth-child(3) { animation-delay: 0.19s; }
.acc-item.is-open .proj-content > *:nth-child(4) { animation-delay: 0.25s; }
.acc-item.is-open .proj-content > *:nth-child(5) { animation-delay: 0.31s; }
.acc-item.is-open .proj-content > *:nth-child(6) { animation-delay: 0.37s; }
.acc-item.is-open .proj-content > *:nth-child(7) { animation-delay: 0.43s; }
.acc-item.is-open .proj-content > *:nth-child(8) { animation-delay: 0.49s; }
.acc-item.is-open .proj-content > *:nth-child(9) { animation-delay: 0.55s; }

.acc-item.is-open .acc-header-main > *,
.acc-item.is-open .acc-stack {
  animation: acc-in 0.38s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.acc-item.is-open .acc-header-main > *:nth-child(1) { animation-delay: 0.03s; }
.acc-item.is-open .acc-header-main > *:nth-child(2) { animation-delay: 0.08s; }
.acc-item.is-open .acc-stack { animation-delay: 0.13s; }

/* Progressive reveal at wider breakpoints */
@media (min-width: 640px) {
  .acc-title { font-size: 0.95rem; }
  .acc-badges { display: flex; }
  .acc-header { padding: 1.1rem 1.5rem; }
}

@media (min-width: 900px) {
  .acc-stack { display: block; }
  .acc-header { gap: 1.2rem; padding: 1.2rem 1.8rem; }
  .acc-title { font-size: 1rem; }
}

@media (min-width: 1200px) {
  .acc-header { padding: 1.3rem 2.2rem; }
  .acc-title { font-size: 1.06rem; }
}