:root {
  --lux-bg-0: #05070b;
  --lux-bg-1: #08111f;
  --lux-bg-2: #0d1a2d;
  --lux-card: rgba(13, 23, 39, .82);
  --lux-border: rgba(178, 208, 255, .16);
  --lux-text: #edf4ff;
  --lux-muted: #93a7c4;
  --lux-gold: #ffc774;
  --lux-cyan: #69d8ff;
  --lux-shadow: 0 24px 80px rgba(0, 0, 0, .48);
  --bs-body-bg: var(--lux-bg-0);
  --bs-body-color: var(--lux-text);
  --bs-border-color: var(--lux-border);
  --bs-secondary-color: var(--lux-muted);
  --bs-tertiary-bg: rgba(255, 255, 255, .04);
}

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 0%, rgba(87, 159, 255, .18), transparent 31rem),
    radial-gradient(circle at 92% 12%, rgba(255, 133, 78, .13), transparent 30rem),
    radial-gradient(circle at 50% 100%, rgba(72, 255, 201, .10), transparent 28rem),
    linear-gradient(135deg, var(--lux-bg-0), var(--lux-bg-1) 42%, #030508);
  color: var(--lux-text);
}

gradient-lab-app,
app-shell,
app-hero,
gradient-workbench,
lux-card,
sampler-toolbar,
image-sampling-stage,
sampled-gradient-list,
gradient-editor,
library-controls,
gradient-library,
library-code,
toast-zone {
  display: block;
  margin-bottom: 1rem;
}

.app-shell {
  max-width: 1440px;
}

.hero-card {
  border: 1px solid var(--lux-border);
  border-radius: 2rem;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, .09), rgba(255, 255, 255, .03)),
    linear-gradient(120deg, rgba(255, 199, 116, .11), rgba(105, 216, 255, .05));
  box-shadow: var(--lux-shadow);
  overflow: hidden;
  position: relative;
}

.lux-card {
  border: 1px solid var(--lux-border);
  border-radius: 1.5rem;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .07), rgba(255, 255, 255, .025)),
    var(--lux-card);
  box-shadow: 0 18px 58px rgba(0, 0, 0, .32);
  backdrop-filter: blur(18px);
  overflow: hidden;
}

.lux-card .card-header {
  border-color: var(--lux-border);
  background: rgba(255, 255, 255, .035);
}

.text-lux-muted { color: var(--lux-muted); }
.text-lux-gold { color: var(--lux-gold); }
.text-lux-cyan { color: var(--lux-cyan); }

.soft-pill {
  border: 1px solid var(--lux-border);
  background: rgba(255, 255, 255, .06);
  border-radius: 999px;
  padding: .35rem .75rem;
  color: var(--lux-muted);
  font-size: .85rem;
}

.stage-frame {
  position: relative;
  min-height: 430px;
  border-radius: 1.35rem;
  border: 1px solid rgba(255, 255, 255, .14);
  background:
    linear-gradient(135deg, rgba(255,255,255,.05), rgba(255,255,255,.015)),
    repeating-conic-gradient(from 45deg, rgba(255,255,255,.025) 0% 25%, transparent 0% 50%) 50% / 34px 34px,
    #07101d;
  display: grid;
  place-items: center;
  overflow: hidden;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.08), inset 0 -30px 90px rgba(0,0,0,.32);
  touch-action: none;
}

.canvas-wrap {
  position: relative;
  display: block;
  max-width: 100%;
  max-height: 620px;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: 0 18px 58px rgba(0,0,0,.45);
}

.image-canvas,
.overlay-svg {
  display: block;
  max-width: 100%;
  user-select: none;
  touch-action: none;
}

.overlay-svg {
  position: absolute;
  inset: 0;
  cursor: crosshair;
}

.drop-hint {
  position: absolute;
  inset: 1rem;
  display: grid;
  place-items: center;
  text-align: center;
  border: 1px dashed rgba(255,255,255,.22);
  border-radius: 1.15rem;
  background: rgba(0,0,0,.18);
  z-index: 3;
}

.drop-hint.hidden { display: none; }

.drop-hint .display-icon {
  width: 4.5rem;
  height: 4.5rem;
  display: grid;
  place-items: center;
  margin-inline: auto;
  border-radius: 1.35rem;
  color: #07101d;
  background: linear-gradient(135deg, var(--lux-gold), var(--lux-cyan));
  box-shadow: 0 20px 50px rgba(105, 216, 255, .16);
  font-size: 2rem;
}

.form-range::-webkit-slider-thumb { background: var(--lux-gold); }
.form-range::-moz-range-thumb { background: var(--lux-gold); }

.gradient-display {
  min-height: 150px;
  border-radius: 1.25rem;
  border: 0;
  box-shadow:
    inset 0 0 0 1px rgba(0,0,0,.28),
    inset 0 1px 0 rgba(255,255,255,.10),
    0 22px 60px rgba(0,0,0,.28);
  overflow: hidden;
  position: relative;
}

.gradient-display::after,
.gradient-chip .preview::after,
.library-well::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(255,255,255,.18), transparent 34%, rgba(0,0,0,.12));
  opacity: .82;
}

.gradient-track {
  position: relative;
  height: 54px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.17);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.14), inset 0 -16px 32px rgba(0,0,0,.24);
  cursor: copy;
}

.editor-stop {
  position: absolute;
  top: 50%;
  width: 19px;
  height: 34px;
  border: 2px solid rgba(255,255,255,.86);
  border-radius: 999px 999px 7px 7px;
  transform: translate(-50%, -50%);
  box-shadow: 0 10px 24px rgba(0,0,0,.4);
  cursor: ew-resize;
}

.editor-stop.selected {
  outline: 3px solid var(--lux-gold);
  outline-offset: 3px;
}

.stop-row {
  border: 1px solid rgba(255,255,255,.10);
  border-radius: 1rem;
  background: rgba(255,255,255,.035);
  padding: .65rem;
}

.stop-row.selected {
  border-color: rgba(255, 199, 116, .5);
  box-shadow: 0 0 0 3px rgba(255, 199, 116, .10);
}

.gradient-stack {
  display: grid;
  gap: .75rem;
}

.gradient-chip {
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.11);
  border-radius: 1.1rem;
  background: rgba(255,255,255,.035);
  overflow: hidden;
  transition: box-shadow .16s ease, transform .16s ease, background .16s ease;
}

.gradient-chip:hover,
.gradient-chip.selected {
  box-shadow: inset 0 0 0 1px rgba(255, 199, 116, .52);
  background: rgba(255, 255, 255, .055);
}

.gradient-chip.selected { transform: translateY(-1px); }

.gradient-chip .preview {
  position: relative;
  min-height: 52px;
  border-radius: .85rem;
  overflow: hidden;
  isolation: isolate;
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,.16),
    inset 0 1px 0 rgba(255,255,255,.18),
    inset 0 -18px 32px rgba(0,0,0,.16);
  background-clip: padding-box;
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.library-item {
  border: 1px solid rgba(255,255,255,.11);
  border-radius: 1.2rem;
  background: rgba(255,255,255,.035);
  padding: .8rem;
}

.library-well {
  position: relative;
  min-height: 90px;
  border: 0;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow:
    inset 0 0 0 1px rgba(0,0,0,.30),
    inset 0 1px 0 rgba(255,255,255,.08);
}

textarea.codebox {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  min-height: 154px;
  color: #d8e8ff;
  background: rgba(2, 8, 16, .82);
  border-color: rgba(255,255,255,.12);
}

.btn-lux {
  --bs-btn-color: #08101d;
  --bs-btn-bg: var(--lux-gold);
  --bs-btn-border-color: var(--lux-gold);
  --bs-btn-hover-color: #07101d;
  --bs-btn-hover-bg: #ffd798;
  --bs-btn-hover-border-color: #ffd798;
  --bs-btn-active-bg: #dca95f;
  --bs-btn-active-border-color: #dca95f;
  box-shadow: 0 12px 28px rgba(255, 199, 116, .16);
}

.btn-soft {
  --bs-btn-color: #dceaff;
  --bs-btn-bg: rgba(255,255,255,.065);
  --bs-btn-border-color: rgba(255,255,255,.14);
  --bs-btn-hover-color: #fff;
  --bs-btn-hover-bg: rgba(255,255,255,.105);
  --bs-btn-hover-border-color: rgba(255,255,255,.24);
}

.empty-state {
  border: 1px dashed rgba(255,255,255,.18);
  border-radius: 1rem;
  padding: 1rem;
  color: var(--lux-muted);
  background: rgba(255,255,255,.025);
}

.toast-lite {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 1080;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 1rem;
  background: rgba(7, 13, 24, .92);
  color: #fff;
  box-shadow: 0 18px 50px rgba(0,0,0,.35);
  padding: .8rem 1rem;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease;
}

.toast-lite.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 768px) {
  .stage-frame { min-height: 320px; }
  .gradient-display { min-height: 110px; }
}