.sr {
  opacity: 0;
  -webkit-transform: translateY(40px);
  transform: translateY(40px);
  -webkit-transition:
    opacity 0.75s ease,
    -webkit-transform 0.75s ease;
  transition:
    opacity 0.75s ease,
    transform 0.75s ease;
  will-change: opacity, transform;
}
.sr.in {
  opacity: 1;
  -webkit-transform: translateY(0);
  transform: translateY(0);
}
.d1 {
  -webkit-transition-delay: 0.08s;
  transition-delay: 0.08s;
}
.d2 {
  -webkit-transition-delay: 0.2s;
  transition-delay: 0.2s;
}
.d3 {
  -webkit-transition-delay: 0.34s;
  transition-delay: 0.34s;
}

/* ============================================================
   PORTFOLIO LISTING PAGE
   ============================================================ */

/* ── Page header ────────────────────────────── */
.pf-header {
  padding: 120px 0 60px;
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}

.pf-header-label {
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #1e3a5f;
  margin-bottom: 0.75rem;
  display: block;
  animation: popIn 0.8s ease-out forwards;
}

.pf-header-heading {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
  color: #1a5276;
  margin-bottom: 0;
  animation: popIn 0.8s ease-out 0.1s both;
}

.pf-header-divider {
  width: 40px;
  height: 2px;
  background: #1b2838;
  margin: 1.25rem auto;
  animation: popIn 0.8s ease-out 0.15s both;
}

.pf-header-sub {
  font-size: 0.95rem;
  color: rgba(30, 58, 95, 0.55);
  font-weight: 300;
  line-height: 1.7;
  animation: popIn 0.8s ease-out 0.2s both;
}

@keyframes popIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Project list ───────────────────────────── */
.pf-list {
  max-width: 900px;
  padding-bottom: 100px;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Project card ───────────────────────────── */
.pf-card {
  display: -webkit-flex;
  display: flex;
  background: linear-gradient(145deg, #1a1a2e 0%, #16213e 60%, #0f3460 100%);
  border: 1px solid rgba(30, 58, 95, 0.18);
  border-radius: 1.25rem;
  overflow: hidden;
  text-decoration: none;
  -webkit-transition:
    border-color 0.25s ease,
    -webkit-transform 0.25s ease,
    box-shadow 0.25s ease;
  transition:
    border-color 0.25s ease,
    transform 0.25s ease,
    box-shadow 0.25s ease;
  /* GPU layer prevents flicker on GitHub Pages CDN */
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

.pf-card:hover {
  border-color: #7fa6d6;
  -webkit-transform: translateY(-4px);
  transform: translateY(-4px);
  box-shadow: 0 12px 36px rgba(15, 30, 55, 0.25);
}

.pf-tag-PC {
  font-size: 0.62rem;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid #90cdf4;
  color: #90cdf4;
  letter-spacing: 0.05em;
  background: rgba(144, 205, 244, 0.08);
}

/* ── Card image (left side) ─────────────────── */
.pf-card-img-wrap {
  position: relative;
  width: 42%;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
  overflow: hidden;
  border-right: #0f3460 solid 5px;
}

.pf-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top left;
  display: block;
  -webkit-transition: -webkit-transform 0.4s ease;
  transition: transform 0.4s ease;
  min-height: 240px;
  object-position: center;
}

.pf-card:hover .pf-card-img {
  -webkit-transform: scale(1.04);
  transform: scale(1.04);
}

.pf-card-img-overlay {
  position: absolute;
  inset: 0;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    to right,
    transparent 60%,
    rgba(22, 33, 62, 0.9) 100%
  );
  pointer-events: none;
}

/* ── Card body (right side) ─────────────────── */
.pf-card-body {
  -webkit-flex: 1;
  flex: 1;
  padding: 2rem 2rem 1.75rem;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
}

.pf-card-tags {
  display: -webkit-flex;
  display: flex;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 0.85rem;
}

.pf-tag {
  font-size: 0.62rem;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid #1a5276;
  color: #1a5276;
  letter-spacing: 0.05em;
  background: rgba(144, 205, 244, 0.08);
}

.pf-card-title {
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  font-weight: 500;
  color: #e8e6df;
  margin-bottom: 0.6rem;
  line-height: 1.2;
}

.pf-card-desc {
  font-size: 0.875rem;
  color: rgba(232, 230, 223, 0.6);
  line-height: 1.75;
  font-weight: 300;
  -webkit-flex: 1;
  flex: 1;
  margin-bottom: 1.25rem;
}

.pf-card-meta {
  margin-bottom: 1.25rem;
}

.pf-card-meta-item {
  font-size: 0.7rem;
  color: #7fa6d6;
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.03em;
}

.pf-meta-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #90cdf4;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
  opacity: 0.5;
}

.pf-card-cta {
  font-size: 0.8rem;
  font-weight: 500;
  color: #90cdf4;
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  gap: 6px;
  -webkit-transition: gap 0.2s ease;
  transition: gap 0.2s ease;
}

.pf-card:hover .pf-card-cta {
  gap: 10px;
}

.pf-cta-arrow {
  -webkit-transition: -webkit-transform 0.2s ease;
  transition: transform 0.2s ease;
}
.pf-card:hover .pf-cta-arrow {
  -webkit-transform: translateX(4px);
  transform: translateX(4px);
}

/* ── Responsive ─────────────────────────────── */
@media (max-width: 767px) {
  .pf-card {
    -webkit-flex-direction: column;
    flex-direction: column;
  }
  .pf-card-img-wrap {
    width: 100%;
    height: 200px;
  }
  .pf-card-img-overlay {
    background: linear-gradient(
      to bottom,
      transparent 50%,
      rgba(22, 33, 62, 0.9) 100%
    );
  }
  .pf-card-body {
    padding: 1.5rem;
  }
}

/* ============================================================
   PROJECT DETAIL PAGE
   ============================================================ */

/* ── Back link ──────────────────────────────── */
.pd-back-wrap {
  max-width: 860px;
  padding-top: 100px;
  padding-bottom: 1.5rem;
  font-weight: bold;
}

.pd-back {
  font-size: 0.78rem;
  color: #1e3a5f;
  text-decoration: none;
  letter-spacing: 0.04em;
  -webkit-transition: color 0.2s;
  transition: color 0.2s;
}
.pd-back:hover {
  color: #1a5276;
  text-decoration: none;
}

/* ── Hero image ─────────────────────────────── */
.pd-hero-wrap {
  position: relative;
  width: 100%;
  max-height: 480px;
  overflow: hidden;
  background: #1a1a2e;
}

.pd-hero-img {
  width: 100%;
  max-height: 480px;
  object-fit: cover;
  object-position: top;
  display: block;
  filter: brightness(0.9);
  object-position: center;
}

.pd-hero-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60%;
  background: linear-gradient(to top, #f8f9fa 0%, transparent 100%);
  pointer-events: none;
}

/* ── Main container ─────────────────────────── */
.pd-container {
  max-width: 860px;
  padding-top: 2rem;
  padding-bottom: 100px;
}

/* ── Tags ───────────────────────────────────── */
.pd-tags {
  margin-bottom: 1rem;
}

/* ── Title & tagline ────────────────────────── */
.pd-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 500;
  color: #1a5276;
  line-height: 1.1;
  margin-bottom: 0.5rem;
}

.pd-tagline {
  font-size: 1.05rem;
  color: rgba(30, 58, 95, 0.55);
  font-weight: 300;
  line-height: 1.6;
  margin-bottom: 0;
}

.pd-divider {
  width: 40px;
  height: 2px;
  background: #1b2838;
  margin: 1.5rem 0 2rem;
}

/* ── Sections ───────────────────────────────── */
.pd-section {
  margin-bottom: 2.5rem;
}

.pd-section-heading {
  font-size: 1rem;
  font-weight: 500;
  color: #1a5276;
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
}

.pd-body {
  font-size: 0.95rem;
  color: #1e3a5f;
  line-height: 1.9;
  font-weight: 300;
  margin-bottom: 0.85rem;
}

.pd-body strong {
  color: #1a5276;
  font-weight: 500;
}
.pd-body code {
  font-size: 0.82rem;
  background: rgba(30, 58, 95, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  color: #1a5276;
}

/* ── Feature list ───────────────────────────── */
.pd-feature-list {
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
  gap: 1rem;
}

.pd-feature {
  display: -webkit-flex;
  display: flex;
  gap: 1rem;
  padding: 1.1rem 1.25rem;
  background: linear-gradient(145deg, #1a1a2e 0%, #16213e 60%, #0f3460 100%);
  border: 1px solid rgba(30, 58, 95, 0.18);
  border-radius: 0.85rem;
  -webkit-align-items: flex-start;
  align-items: flex-start;
}

.pd-feature-icon {
  font-size: 1.3rem;
  line-height: 1;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
  margin-top: 2px;
}

.pd-feature-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: #90cdf4;
  margin-bottom: 4px;
}

.pd-feature-desc {
  font-size: 0.82rem;
  color: rgba(144, 205, 244, 0.65);
  line-height: 1.7;
  font-weight: 300;
}

/* ── Sidebar ────────────────────────────────── */
.pd-sidebar {
  background: linear-gradient(145deg, #1a1a2e 0%, #16213e 60%, #0f3460 100%);
  border: 1px solid rgba(30, 58, 95, 0.18);
  border-radius: 1rem;
  padding: 1.75rem;
  position: sticky;
  top: 90px;
  margin-top: 2rem;
}

.pd-live-btn {
  display: block;
  width: 100%;
  text-align: center;
  padding: 10px;
  border-radius: 0.65rem;
  background: #1e3a5f;
  color: #90cdf4;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-decoration: none;
  margin-bottom: 1.5rem;
  -webkit-transition:
    background 0.2s ease,
    color 0.2s ease;
  transition:
    background 0.2s ease,
    color 0.2s ease;
}
.pd-live-btn:hover {
  background: #7fa6d6;
  color: #0f3460;
  text-decoration: none;
}

.pd-sidebar-section {
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid rgba(144, 205, 244, 0.1);
}
.pd-sidebar-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.pd-sidebar-label {
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(144, 205, 244, 0.45);
  margin-bottom: 0.5rem;
}

.pd-sidebar-val {
  font-size: 0.82rem;
  color: #90cdf4;
  font-weight: 300;
  line-height: 1.5;
}

.pd-stack-list {
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
  gap: 0.6rem;
}

.pd-stack-row {
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
  gap: 2px;
}

.pd-stack-layer {
  font-size: 0.62rem;
  color: rgba(144, 205, 244, 0.4);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pd-stack-val {
  font-size: 0.78rem;
  color: #90cdf4;
  font-weight: 300;
  line-height: 1.4;
}

/* ── Responsive detail page ─────────────────── */
@media (max-width: 991px) {
  .pd-sidebar {
    position: static;
    margin-top: 2rem;
  }
  .pd-hero-wrap {
    max-height: 280px;
  }
  .pd-hero-img {
    max-height: 280px;
  }
}

/* ── Feature card with image ────────────────── */

/* Override: image variant stacks vertically */
.pd-feature--img {
  -webkit-flex-direction: column;
  flex-direction: column;
  padding: 0;
  overflow: hidden;
}

/* Top row — icon + text, same padding as before */
.pd-feature-top {
  display: -webkit-flex;
  display: flex;
  gap: 1rem;
  padding: 1.1rem 1.25rem 1rem;
  -webkit-align-items: flex-start;
  align-items: flex-start;
}

/* Image container — hidden via onerror if image is missing */
.pd-feature-img-wrap {
  width: 100%;
  overflow: hidden;
  border-top: 1px solid rgba(144, 205, 244, 0.1);
  max-height: 280px;
  background: rgba(0, 0, 0, 0.2);
}

.pd-feature-img {
  width: 100%;
  height: 100%;
  max-height: 280px;
  object-fit: cover;
  object-position: top left;
  display: block;
  -webkit-transition: -webkit-transform 0.4s ease;
  transition: transform 0.4s ease;
}

.pd-feature--img:hover .pd-feature-img {
  -webkit-transform: scale(1.02);
  transform: scale(1.02);
}

/* ── Feature image lightbox ─────────────────── */
.pd-feature-img-wrap {
  cursor: zoom-in;
}

.pd-img-lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 15, 30, 0.95);
  z-index: 4000;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  -webkit-transition: opacity 0.25s ease;
  transition: opacity 0.25s ease;
  cursor: zoom-out;
}
.pd-img-lightbox.active {
  display: flex;
}
.pd-img-lightbox.visible {
  opacity: 1;
}

.pd-img-lightbox img {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 0.75rem;
  -webkit-transform: scale(0.95);
  transform: scale(0.95);
  -webkit-transition:
    -webkit-transform 0.3s ease,
    opacity 0.3s ease;
  transition:
    transform 0.3s ease,
    opacity 0.3s ease;
  opacity: 0;
  pointer-events: none;
}
.pd-img-lightbox.visible img {
  -webkit-transform: scale(1);
  transform: scale(1);
  opacity: 1;
}

.pd-img-lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  -webkit-transition: background 0.2s;
  transition: background 0.2s;
}
.pd-img-lightbox-close:hover {
  background: rgba(255, 255, 255, 0.25);
}