/* Engineering Core v2 — truth-first instrumentation + balanced rendering */

:root { --color-brand-purple: var(--color-brand-violet); }

/* --------------------------------------------------------------------------
   Perspective naming / Easter egg
   -------------------------------------------------------------------------- */
#modeBtnEngineer .mode-text { font-size: 0; }
#modeBtnEngineer .mode-text::after { content: 'Technical'; font-size: .76rem; }
#avatarMascot { -webkit-tap-highlight-color: transparent; }

/* --------------------------------------------------------------------------
   Balanced compositor profile
   Keep the visual language, reduce large persistent blur surfaces.
   -------------------------------------------------------------------------- */
.ambient-orb {
  filter: blur(52px) !important;
  opacity: .48;
  will-change: auto;
}
.satellite-bubble {
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  background: rgba(255,255,255,.82) !important;
}
.hud-pill,
.hud-btn,
.hud-mode-pill {
  backdrop-filter: blur(12px) saturate(145%) !important;
  -webkit-backdrop-filter: blur(12px) saturate(145%) !important;
}
.card-face-front {
  backdrop-filter: blur(20px) saturate(160%) !important;
  -webkit-backdrop-filter: blur(20px) saturate(160%) !important;
}
.card-face-back {
  backdrop-filter: blur(18px) saturate(160%) !important;
  -webkit-backdrop-filter: blur(18px) saturate(160%) !important;
}

/* Lower-end / mobile hardware gets an even cheaper passive background. */
html.perf-constrained .orb-4,
html.perf-constrained .orb-5 { display: none !important; }
html.perf-constrained .ambient-orb {
  animation: none !important;
  filter: blur(38px) !important;
  opacity: .38 !important;
}
html.perf-constrained .satellites-layer { display: none !important; }
html.perf-constrained .hud-pill,
html.perf-constrained .hud-btn,
html.perf-constrained .hud-mode-pill,
html.perf-constrained .card-face-front {
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
}

/* --------------------------------------------------------------------------
   Modal regression fix
   The old optimization erased most of the page before the backdrop blurred it,
   which produced the washed-out/white background. Keep the page visible,
   freeze passive motion, and blur/dim it through one lightweight backdrop.
   -------------------------------------------------------------------------- */
body.modal-open .ambient-background {
  opacity: 1 !important;
}
body.modal-open .ambient-orb {
  display: block !important;
  animation-play-state: paused !important;
  opacity: .34 !important;
}
body.modal-open .corner-characters-layer,
body.modal-open .satellites-layer {
  display: block !important;
  opacity: .48;
}
body.modal-open .satellite-item,
body.modal-open .corner-characters-layer * {
  animation-play-state: paused !important;
}
.modal-backdrop {
  background: rgba(15,23,42,.34) !important;
  backdrop-filter: blur(9px) saturate(88%) !important;
  -webkit-backdrop-filter: blur(9px) saturate(88%) !important;
}
.modal-container {
  will-change: auto !important;
  transform: scale(.97) translateY(10px);
}
.modal-overlay.is-active .modal-container {
  transform: scale(1) translateY(0);
}
.modal-scroll-area {
  overscroll-behavior: contain;
}

/* Let the browser skip paint/layout work for off-screen modal cards. */
.capability-card,
.project-showcase-card {
  content-visibility: auto;
  contain-intrinsic-size: auto 150px;
}

/* --------------------------------------------------------------------------
   V2 instrumentation panel
   -------------------------------------------------------------------------- */
.eng-v2-panel {
  position: relative;
  border: 1px solid rgba(56,189,248,.28);
  background: linear-gradient(135deg, rgba(8,15,28,.9), rgba(15,23,42,.72));
  border-radius: 10px;
  padding: 12px;
  overflow: hidden;
}
.eng-v2-panel::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(56,189,248,.04) 1px, transparent 1px), linear-gradient(90deg,rgba(56,189,248,.04) 1px,transparent 1px);
  background-size: 20px 20px;
  mask-image: linear-gradient(to bottom,black,transparent 92%);
}
.eng-v2-head { display:flex; align-items:center; justify-content:space-between; gap:10px; margin-bottom:10px; position:relative; }
.eng-v2-title { font:800 .66rem/1.2 ui-monospace,SFMono-Regular,Menlo,monospace; letter-spacing:.13em; color:#7DD3FC; }
.eng-v2-source { font:700 .56rem/1 ui-monospace,SFMono-Regular,Menlo,monospace; color:#34D399; border:1px solid rgba(52,211,153,.28); border-radius:999px; padding:4px 7px; }
.eng-v2-grid { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:7px; position:relative; }
.eng-v2-metric { min-width:0; padding:8px; border-radius:7px; background:rgba(2,6,23,.58); border:1px solid rgba(148,163,184,.13); }
.eng-v2-k { display:block; font:700 .52rem/1.2 ui-monospace,SFMono-Regular,Menlo,monospace; letter-spacing:.08em; color:#64748B; margin-bottom:4px; }
.eng-v2-v { display:block; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; font:800 .72rem/1.15 ui-monospace,SFMono-Regular,Menlo,monospace; color:#E2E8F0; }
.eng-v2-v.good { color:#34D399; }
.eng-v2-v.warn { color:#FBBF24; }
.eng-v2-v.pending { color:#94A3B8; }
.eng-v2-actions { margin-top:9px; display:flex; gap:7px; position:relative; }
.eng-v2-btn { appearance:none; border:1px solid rgba(56,189,248,.25); background:rgba(14,116,144,.12); color:#BAE6FD; border-radius:6px; padding:6px 9px; font:800 .56rem ui-monospace,SFMono-Regular,Menlo,monospace; cursor:pointer; }
.eng-v2-btn:hover { background:rgba(14,116,144,.22); border-color:rgba(56,189,248,.5); }

/* --------------------------------------------------------------------------
   Simulator polish
   -------------------------------------------------------------------------- */
.v2-sim-note { margin:6px 0 0; font:600 .66rem/1.45 var(--font-body); color:var(--text-muted); }
.v2-sim-note code { font-family:ui-monospace,SFMono-Regular,Menlo,monospace; color:var(--color-brand-blue); }
.mesh-control-bar { align-items:center; }
.mesh-step-btn { min-height:40px; max-height:44px; padding:9px 14px; line-height:1.2; overflow:hidden; }
.mesh-step-btn span { min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.mesh-step-btn svg { display:block; width:16px !important; height:16px !important; min-width:16px; flex:0 0 16px; }
.mesh-reset-btn { flex:0 0 40px; padding:0; }
.mesh-reset-btn svg { display:block; width:18px !important; height:18px !important; }
#nodeBob.v2-draggable { cursor:grab !important; touch-action:none; user-select:none; position:relative; z-index:5; transition:filter .18s ease; }
#nodeBob.v2-draggable:active { cursor:grabbing !important; filter:drop-shadow(0 0 12px rgba(56,189,248,.45)); }

/* Preserve the original dark/glitch/true-3D Engineering Core transition. */
body.is-engineering-core .card-face-back > * { animation:v2CoreIn .55s cubic-bezier(.16,1,.3,1) both; }
body.is-engineering-core .card-face-back > *:nth-child(2) { animation-delay:.05s; }
body.is-engineering-core .card-face-back > *:nth-child(3) { animation-delay:.09s; }
body.is-engineering-core .card-face-back > *:nth-child(4) { animation-delay:.13s; }
body.is-engineering-core .card-face-back > *:nth-child(5) { animation-delay:.17s; }
@keyframes v2CoreIn { from { opacity:0; transform:translateY(8px) translateZ(12px); } to { opacity:1; transform:none; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior:auto !important; }
  .ambient-orb,.satellite-item,.pulse-ring { animation:none !important; }
}

@media (max-width:640px) {
  .eng-v2-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
  #modeBtnEngineer .mode-text::after { font-size:.74rem; }
  .mesh-step-btn { padding:8px 10px; font-size:.76rem; }
  .mesh-step-btn svg { width:14px !important; height:14px !important; min-width:14px; flex-basis:14px; }
  .modal-backdrop {
    backdrop-filter: blur(6px) saturate(90%) !important;
    -webkit-backdrop-filter: blur(6px) saturate(90%) !important;
  }
}

/* ==========================================================================
   Master-Detail Project Showcase & Case Study Engine
   ========================================================================== */

/* Expand modal container for spacious 2-column showcase */
.modal-container-lg {
  max-width: 960px !important;
}

/* Detail Navigation Bar inside Sticky Header */
.detail-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 24px 12px;
  background: rgba(255, 255, 255, 0.98);
  border-top: 1px solid rgba(226, 232, 240, 0.8);
}

.btn-back-gallery {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 8px;
  background: rgba(241, 245, 249, 0.9);
  border: 1.5px solid rgba(203, 213, 225, 0.9);
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  outline: none;
}

.btn-back-gallery:hover {
  background: var(--color-brand-indigo);
  color: #FFFFFF;
  border-color: var(--color-brand-indigo);
  transform: translateX(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.detail-nav-kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 5px;
  border-radius: 4px;
  background: rgba(226, 232, 240, 0.8);
  border: 1px solid rgba(203, 213, 225, 0.9);
  color: var(--text-secondary);
}

.btn-back-gallery:hover .detail-nav-kbd {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.3);
  color: #FFFFFF;
}

.detail-nav-middle {
  display: flex;
  align-items: center;
}

.detail-project-indicator {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--color-brand-indigo);
  background: rgba(238, 242, 255, 0.8);
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid rgba(199, 210, 254, 0.8);
}

.detail-nav-pagination {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-page-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  border-radius: 8px;
  background: rgba(248, 250, 252, 0.9);
  border: 1px solid rgba(203, 213, 225, 0.8);
  font-family: var(--font-heading);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  outline: none;
}

.nav-page-btn svg {
  width: 14px;
  height: 14px;
}

.nav-page-btn:hover {
  background: #FFFFFF;
  color: var(--color-brand-blue);
  border-color: rgba(147, 197, 253, 0.9);
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.1);
}

/* Gallery View & Responsive Grid */
.apps-view-gallery {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.meta-hint-tag {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--color-brand-indigo);
  background: rgba(238, 242, 255, 0.6);
  padding: 3px 9px;
  border-radius: 6px;
  border: 1px solid rgba(199, 210, 254, 0.5);
}

.projects-gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

/* Gallery Project Card */
.project-gallery-card {
  position: relative;
  background: rgba(255, 255, 255, 0.88);
  border: 1.5px solid rgba(226, 232, 240, 0.95);
  border-radius: 14px;
  box-shadow: 0 4px 18px rgba(37, 99, 235, 0.04);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  cursor: pointer;
  transition: transform 0.24s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.2s ease,
              box-shadow 0.24s ease,
              background 0.2s ease;
  user-select: none;
}

.project-gallery-card:hover {
  background: #FFFFFF;
  border-color: rgba(99, 102, 241, 0.6);
  transform: translateY(-3px);
  box-shadow: 0 14px 34px rgba(37, 99, 235, 0.12);
}

.project-gallery-card.is-hidden {
  display: none !important;
}

.pgc-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.pgc-num {
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--color-brand-indigo);
  background: rgba(238, 242, 255, 0.9);
  border: 1px solid rgba(199, 210, 254, 0.8);
  padding: 3px 8px;
  border-radius: 6px;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.pgc-pills {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.pgc-identity-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.pgc-thumb-box {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  background: linear-gradient(135deg, #F0F6FF 0%, #E0F2FE 100%);
  flex-shrink: 0;
  box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.8), 0 4px 12px rgba(37, 99, 235, 0.06);
  overflow: hidden;
}

.pgc-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 8px;
}

.pgc-title-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.pgc-title {
  font-family: var(--font-heading);
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.25;
}

.pgc-subtitle {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.pgc-tagline-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: linear-gradient(135deg, rgba(238, 242, 255, 0.7) 0%, rgba(240, 249, 255, 0.7) 100%);
  border-radius: 8px;
  border: 1px solid rgba(199, 210, 254, 0.5);
  font-size: 0.76rem;
  font-weight: 600;
  color: #3730A3;
  line-height: 1.35;
}

.pgc-footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: auto;
  padding-top: 4px;
}

.pgc-tech-chips {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 5px;
}

.pgc-chip {
  font-size: 0.66rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 5px;
  background: #F1F5F9;
  border: 1px solid #E2E8F0;
  color: #475569;
}

.btn-inspect-case-study {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  background: rgba(238, 242, 255, 0.9);
  border: 1px solid rgba(199, 210, 254, 0.8);
  border-radius: 7px;
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-brand-indigo);
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.project-gallery-card:hover .btn-inspect-case-study {
  background: var(--color-brand-indigo);
  color: #FFFFFF;
  border-color: var(--color-brand-indigo);
  transform: translateX(2px);
}

/* Detail Case Study Pane */
.apps-view-detail {
  position: relative;
}

.case-study-pane {
  display: flex;
  flex-direction: column;
  gap: 16px;
  animation: csFadeIn 0.28s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes csFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.cs-stage-header {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px 20px;
  background: rgba(248, 250, 252, 0.92);
  border: 1px solid rgba(226, 232, 240, 0.9);
  border-radius: 12px;
}

.cs-header-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.cs-num-badge {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--color-brand-indigo);
  background: rgba(238, 242, 255, 0.95);
  border: 1px solid rgba(199, 210, 254, 0.8);
  padding: 3px 10px;
  border-radius: 6px;
  letter-spacing: 0.05em;
}

.cs-pills-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.cs-header-identity {
  display: flex;
  align-items: center;
  gap: 14px;
}

.cs-thumb-box {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  background: linear-gradient(135deg, #F0F6FF 0%, #E0F2FE 100%);
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.08);
}

.cs-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 8px;
}

.cs-title-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.cs-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}

.cs-subtitle {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.cs-tagline-quote {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: linear-gradient(135deg, rgba(238, 242, 255, 0.85) 0%, rgba(240, 249, 255, 0.85) 100%);
  border-radius: 8px;
  border: 1px solid rgba(199, 210, 254, 0.6);
  font-size: 0.82rem;
  font-weight: 600;
  color: #3730A3;
}

.cs-content-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Mobile responsive adjustments */
@media (max-width: 768px) {
  .projects-gallery-grid {
    grid-template-columns: 1fr;
  }
  .detail-nav-bar {
    padding: 8px 14px 10px;
  }
  .btn-back-gallery {
    padding: 5px 10px;
    font-size: 0.74rem;
  }
  .detail-nav-kbd {
    display: none;
  }
  .detail-project-indicator {
    font-size: 0.74rem;
    padding: 3px 8px;
  }
  .nav-page-btn {
    padding: 5px 8px;
    font-size: 0.7rem;
  }
}

/* ==========================================================================
   Step 3: Native Mobile Bottom-Sheet & 44px Touch Ergonomics (WCAG 2.5.5)
   ========================================================================== */

/* Universal elimination of mobile 300ms touch delay */
button,
a,
input,
select,
textarea,
.action-card,
.connect-chip,
.contact-pill,
.proof-chip,
.filter-tab,
.project-gallery-card {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

/* Tablet & Mobile Showcase Grid (max-width: 768px) */
@media (max-width: 768px) {
  .projects-gallery-grid {
    grid-template-columns: 1fr !important;
    gap: 12px !important;
  }
}

/* Native Mobile Bottom-Sheet (max-width: 640px) */
@media (max-width: 640px) {
  .modal-overlay {
    padding: 0 !important;
    align-items: flex-end !important;
    justify-content: center !important;
  }

  .modal-container,
  .modal-container-lg,
  .modal-container-sm,
  .modal-container-cmd {
    width: 100% !important;
    max-width: 100% !important;
    height: 92vh !important;
    height: 92dvh !important;
    max-height: 92vh !important;
    max-height: 92dvh !important;
    margin: 0 !important;
    border-radius: 22px 22px 0 0 !important;
    border: none !important;
    border-top: 1px solid rgba(255, 255, 255, 0.9) !important;
    box-shadow: 0 -12px 40px rgba(15, 23, 42, 0.28) !important;
    transform: translateY(100%) !important;
    transition: transform 0.32s cubic-bezier(0.16, 1, 0.3, 1) !important;
  }

  .modal-overlay.is-active .modal-container,
  .modal-overlay.is-active .modal-container-lg,
  .modal-overlay.is-active .modal-container-sm,
  .modal-overlay.is-active .modal-container-cmd {
    transform: translateY(0) !important;
  }

  .modal-scroll-area {
    height: 100% !important;
    max-height: calc(92dvh - 60px) !important;
    overscroll-behavior-y: contain !important;
    -webkit-overflow-scrolling: touch !important;
  }

  /* Tactile pull-to-dismiss handle at top of modal */
  .modal-sticky-top::before {
    content: '' !important;
    display: block !important;
    width: 42px !important;
    height: 5px !important;
    background: #CBD5E1 !important;
    border-radius: 999px !important;
    margin: 10px auto 4px !important;
    flex-shrink: 0 !important;
  }

  .modal-header {
    padding: 8px 16px 10px !important;
  }

  .modal-title {
    font-size: 1.18rem !important;
  }

  .modal-subtitle {
    font-size: 0.76rem !important;
  }

  /* Touch-target minimum 44px */
  .modal-close-btn {
    width: 44px !important;
    height: 44px !important;
    min-width: 44px !important;
    min-height: 44px !important;
  }

  .hud-btn {
    width: 44px !important;
    height: 44px !important;
    min-width: 44px !important;
    min-height: 44px !important;
  }

  /* Filter Tabs Bar: high-comfort swipeable tabs */
  .filter-tabs-bar {
    padding: 6px 16px 12px !important;
    gap: 8px !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important;
  }
  .filter-tab {
    min-height: 42px !important;
    padding: 8px 16px !important;
    font-size: 0.82rem !important;
  }

  /* Case study detail navigation */
  .detail-nav-bar {
    padding: 8px 14px 10px !important;
    gap: 8px !important;
  }
  .btn-back-gallery {
    min-height: 42px !important;
    padding: 8px 14px !important;
    font-size: 0.8rem !important;
  }
  .nav-page-btn {
    min-height: 42px !important;
    min-width: 42px !important;
    padding: 8px 12px !important;
    font-size: 0.78rem !important;
  }

  .modal-content-area {
    padding: 14px 16px 24px !important;
  }

  .portfolio-meta-bar {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 6px !important;
  }

  /* Gallery Cards on mobile */
  .project-gallery-card {
    padding: 14px 16px !important;
    gap: 10px !important;
  }
  .btn-inspect-case-study {
    min-height: 40px !important;
    padding: 8px 14px !important;
    font-size: 0.78rem !important;
  }

  /* Case Study Stage on mobile */
  .cs-stage-header {
    padding: 14px 16px !important;
  }
  .cs-title {
    font-size: 1.22rem !important;
  }
  .cs-subtitle {
    font-size: 0.8rem !important;
  }
  .cs-content-body .built-features-grid {
    grid-template-columns: 1fr !important;
    gap: 10px !important;
  }

  /* Simulator controls on mobile */
  .fsrs-grade-btn {
    min-height: 48px !important;
    padding: 10px 6px !important;
  }
  .mesh-step-btn {
    min-height: 44px !important;
  }
  .mesh-reset-btn {
    min-height: 44px !important;
    min-width: 44px !important;
  }

  /* Bottom sheet sticky footer */
  .modal-footer {
    padding: 12px 16px max(16px, env(safe-area-inset-bottom, 16px)) !important;
  }
  .modal-action-btn {
    min-height: 48px !important;
  }
}

/* Small Smartphone Ergonomics (max-width: 480px) */
@media (max-width: 480px) {
  .page-stage {
    padding: 62px 10px 20px !important;
  }

  .card-face-front {
    padding: 22px 14px 18px !important;
    gap: 16px !important;
  }

  .hero-name {
    font-size: 1.75rem !important;
  }

  .hero-tagline {
    font-size: 0.85rem !important;
  }

  .engineering-proof-row {
    gap: 6px !important;
  }
  .proof-chip {
    padding: 6px 10px !important;
    font-size: 0.72rem !important;
  }

  .action-card {
    padding: 12px 14px !important;
    min-height: 64px !important;
  }

  .connect-chip {
    padding: 12px 14px !important;
    min-height: 64px !important;
  }

  .contact-pill {
    min-height: 48px !important;
  }
}

/* ==========================================================================
   Step 4: Dark Theme & Adaptive Floating Assets (Chroma Key Cyber Edition)
   ========================================================================== */

/* Corner Characters Dual-State Crossfade */
.corner-char {
  position: absolute !important;
}

.corner-char .char-img {
  display: block;
  width: 100%;
  height: auto;
  user-select: none;
  -webkit-user-drag: none;
  transition: opacity 0.45s cubic-bezier(0.16, 1, 0.3, 1), transform 0.45s ease;
}

.corner-char .char-light {
  position: relative;
  opacity: 1;
  pointer-events: auto;
}

.corner-char .char-dark {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  pointer-events: none;
  filter: drop-shadow(0 0 30px rgba(56, 189, 248, 0.45));
}

/* Crossfade to Dark Cyber characters in Dark Theme or Engineering Core */
body.dark-theme .corner-char .char-light,
body.is-engineering-core .corner-char .char-light {
  opacity: 0;
  pointer-events: none;
}

body.dark-theme .corner-char .char-dark,
body.is-engineering-core .corner-char .char-dark {
  opacity: 1;
  pointer-events: auto;
}

/* Dark Theme Full Environment */
body.dark-theme {
  background: #020617;
  color: #F8FAFC;
}

body.dark-theme .ambient-background {
  background: radial-gradient(ellipse 85% 65% at 50% -15%, #1e1b4b 0%, #030712 60%, #020617 100%) !important;
}

body.dark-theme .ambient-orb.orb-1 { background: radial-gradient(circle, #38BDF8 0%, transparent 70%); }
body.dark-theme .ambient-orb.orb-2 { background: radial-gradient(circle, #818CF8 0%, transparent 70%); }
body.dark-theme .ambient-orb.orb-3 { background: radial-gradient(circle, #C084FC 0%, transparent 70%); }

/* Floating HUD in Dark Theme */
body.dark-theme .hud-pill,
body.dark-theme .hud-mode-pill,
body.dark-theme .hud-btn {
  background: rgba(15, 23, 42, 0.85) !important;
  border-color: rgba(148, 163, 184, 0.22) !important;
  color: #E2E8F0 !important;
}

body.dark-theme .hud-btn:hover {
  background: rgba(30, 41, 59, 0.95) !important;
  border-color: rgba(56, 189, 248, 0.55) !important;
  color: #38BDF8 !important;
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.25) !important;
}

/* Front Card in Dark Theme */
body.dark-theme .card-face-front {
  background: rgba(15, 23, 42, 0.92) !important;
  border: 1.5px solid rgba(148, 163, 184, 0.18) !important;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.65), inset 0 1px 0 rgba(255, 255, 255, 0.08) !important;
}

body.dark-theme .hero-name {
  background: linear-gradient(135deg, #FFFFFF 0%, #E2E8F0 50%, #93C5FD 100%) !important;
  -webkit-background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
}

body.dark-theme .hero-tagline {
  color: #94A3B8 !important;
}

body.dark-theme .quote-pill {
  background: rgba(30, 41, 59, 0.8) !important;
  border-color: rgba(99, 102, 241, 0.35) !important;
}

body.dark-theme .quote-text {
  color: #C7D2FE !important;
}

body.dark-theme .proof-chip {
  background: rgba(30, 41, 59, 0.85) !important;
  border-color: rgba(148, 163, 184, 0.22) !important;
  color: #E2E8F0 !important;
}

body.dark-theme .proof-chip:hover {
  background: rgba(51, 65, 85, 0.95) !important;
  border-color: rgba(56, 189, 248, 0.6) !important;
  box-shadow: 0 4px 16px rgba(56, 189, 248, 0.25) !important;
}

body.dark-theme .action-card {
  background: rgba(30, 41, 59, 0.75) !important;
  border-color: rgba(148, 163, 184, 0.18) !important;
}

body.dark-theme .action-card:hover {
  background: rgba(51, 65, 85, 0.9) !important;
  border-color: rgba(99, 102, 241, 0.6) !important;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4) !important;
}

body.dark-theme .action-title {
  color: #F8FAFC !important;
}

body.dark-theme .action-desc {
  color: #94A3B8 !important;
}

body.dark-theme .connect-chip {
  background: rgba(30, 41, 59, 0.75) !important;
  border-color: rgba(148, 163, 184, 0.18) !important;
}

body.dark-theme .chip-label {
  color: #F8FAFC !important;
}

body.dark-theme .chip-sub {
  color: #94A3B8 !important;
}

body.dark-theme .contact-pill {
  background: rgba(30, 41, 59, 0.75) !important;
  border-color: rgba(148, 163, 184, 0.18) !important;
}

body.dark-theme .pill-name {
  color: #E2E8F0 !important;
}

body.dark-theme .pill-val {
  color: #94A3B8 !important;
}

/* Dark Satellites Glowing Ring */
body.dark-theme .satellite-bubble,
body.is-engineering-core .satellite-bubble {
  background: rgba(15, 23, 42, 0.88) !important;
  border: 1.5px solid rgba(56, 189, 248, 0.4) !important;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.1) !important;
}

/* Modals in Dark Theme */
body.dark-theme .modal-container,
body.dark-theme .modal-sticky-top,
body.dark-theme .modal-footer {
  background: #0B1120 !important;
  border-color: rgba(148, 163, 184, 0.18) !important;
  color: #F8FAFC !important;
}

body.dark-theme .modal-title {
  color: #F8FAFC !important;
}

body.dark-theme .modal-subtitle {
  color: #94A3B8 !important;
}

body.dark-theme .project-gallery-card {
  background: rgba(15, 23, 42, 0.85) !important;
  border-color: rgba(148, 163, 184, 0.18) !important;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4) !important;
}

body.dark-theme .project-gallery-card:hover {
  background: rgba(30, 41, 59, 0.95) !important;
  border-color: rgba(99, 102, 241, 0.6) !important;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.6) !important;
}

body.dark-theme .pgc-title {
  color: #F8FAFC !important;
}

body.dark-theme .pgc-subtitle {
  color: #94A3B8 !important;
}

body.dark-theme .pgc-tagline-bar {
  background: rgba(30, 41, 59, 0.7) !important;
  border-color: rgba(99, 102, 241, 0.3) !important;
  color: #C7D2FE !important;
}

body.dark-theme .cs-stage-header {
  background: rgba(15, 23, 42, 0.9) !important;
  border-color: rgba(148, 163, 184, 0.18) !important;
}

body.dark-theme .cs-title {
  color: #F8FAFC !important;
}

body.dark-theme .cs-subtitle {
  color: #94A3B8 !important;
}

body.dark-theme .section-heading {
  color: #F8FAFC !important;
}

body.dark-theme .section-text {
  color: #CBD5E1 !important;
}

body.dark-theme .built-features-grid li {
  color: #CBD5E1 !important;
}

body.dark-theme .tech-highlight-callout {
  background: rgba(30, 41, 59, 0.8) !important;
  border-color: rgba(99, 102, 241, 0.35) !important;
}

body.dark-theme .detail-nav-bar {
  background: #0B1120 !important;
  border-color: rgba(148, 163, 184, 0.18) !important;
}

body.dark-theme .btn-back-gallery {
  background: rgba(30, 41, 59, 0.85) !important;
  border-color: rgba(148, 163, 184, 0.25) !important;
  color: #E2E8F0 !important;
}

body.dark-theme .nav-page-btn {
  background: rgba(30, 41, 59, 0.85) !important;
  border-color: rgba(148, 163, 184, 0.25) !important;
  color: #E2E8F0 !important;
}