.upgrade-layout {
  display: grid;
  grid-template-columns: 1fr 340px 1fr;
  gap: 24px;
  align-items: start;
}
.upgrade-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 20px;
}
.upgrade-panel__title {
  font-size: 12px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--text3);
  margin-bottom: 16px;
  display: flex; align-items: center; justify-content: space-between;
}
.upgrade-center {
  display: flex; flex-direction: column; align-items: center; gap: 20px;
}
.upgrade-arrows {
  display: flex; align-items: center; gap: 24px;
  font-size: 28px; color: var(--text3);
}
.upgrade-arrow { transition: color .2s; }
.upgrade-arrow--active { color: var(--primary); animation: pulse-arrow 1s ease-in-out infinite alternate; }
@keyframes pulse-arrow { from { opacity:.4; } to { opacity:1; } }

/* The probability ring */
.prob-outer {
  width: 220px; height: 220px;
  position: relative;
  display: flex; align-items: center; justify-content: center;
}
.prob-svg { position: absolute; inset: 0; }
.prob-track { fill: none; stroke: var(--surface3); stroke-width: 12; }
.prob-fill {
  fill: none; stroke-width: 12;
  stroke-linecap: round;
  stroke: url(#probGrad);
  transition: stroke-dashoffset 0.6s var(--ease-out);
  transform-origin: center;
  transform: rotate(-90deg);
}
.prob-center {
  position: relative; z-index: 2;
  text-align: center;
}
.prob-pct {
  font-size: 44px; font-weight: 800;
  letter-spacing: -.04em;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.prob-label { font-size: 12px; color: var(--text3); margin-top: 2px; font-weight: 500; }
.prob-status { font-size: 11px; margin-top: 4px; color: var(--success); font-weight: 600; }

/* Multiplier selector */
.mult-grid {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px;
}
.mult-btn {
  padding: 8px 4px; border-radius: var(--r-sm);
  border: 1px solid var(--border2);
  background: var(--surface2);
  font-size: 13px; font-weight: 700; color: var(--text2);
  cursor: pointer; transition: all .2s; text-align: center;
}
.mult-btn:hover, .mult-btn.active {
  border-color: var(--primary); background: var(--primary-dim); color: var(--primary);
}

/* Inventory grid */
.inv-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px;
  max-height: 440px; overflow-y: auto;
}
.inv-item {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 8px;
  cursor: pointer; text-align: center;
  transition: all .2s;
  position: relative;
}
.inv-item:hover { border-color: var(--primary); }
.inv-item.selected {
  border-color: var(--primary);
  background: var(--primary-dim);
  box-shadow: 0 0 16px rgba(75,124,255,.2);
}
.inv-item.selected::after {
  content: '✓';
  position: absolute; top: 4px; right: 4px;
  width: 18px; height: 18px;
  background: var(--primary); color: #fff;
  border-radius: 50%; font-size: 10px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.inv-item img { width: 70px; height: 50px; object-fit: contain; }
.inv-item__weapon { font-size: 10px; color: var(--text3); }
.inv-item__name { font-size: 11px; font-weight: 600; }
.inv-item__price { font-size: 11px; color: var(--warning); font-weight: 700; }

/* Target selector */
.target-placeholder {
  width: 100%; aspect-ratio: 1;
  background: var(--surface2);
  border: 2px dashed var(--border2);
  border-radius: var(--r-lg);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 8px; cursor: pointer;
  transition: border-color .2s;
}
.target-placeholder:hover { border-color: var(--primary); }
.target-placeholder__icon { font-size: 32px; }
.target-placeholder__text { font-size: 13px; color: var(--text3); }

.target-item {
  width: 100%;
  background: var(--surface2);
  border: 2px solid rgba(75,124,255,.3);
  border-radius: var(--r-lg);
  padding: 16px;
  text-align: center;
  position: relative;
}
.target-item__change {
  position: absolute; top: 8px; right: 8px;
  font-size: 11px; color: var(--text3);
  cursor: pointer; padding: 3px 8px;
  background: var(--surface3); border-radius: 20px;
  transition: color .2s;
}
.target-item__change:hover { color: var(--primary); }
.target-item img { width: 120px; height: 90px; object-fit: contain; margin: 0 auto 8px; }
.target-item__name { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.target-item__price { font-size: 20px; font-weight: 800; color: var(--warning); }

/* Upgrade button */
.upgrade-btn {
  width: 100%; padding: 18px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border: none; border-radius: var(--r-lg);
  font-size: 17px; font-weight: 700; color: #fff;
  cursor: pointer;
  box-shadow: 0 8px 32px rgba(75,124,255,.4);
  transition: all .25s var(--ease-out);
  position: relative; overflow: hidden;
}
.upgrade-btn::after {
  content: '';
  position: absolute; inset: 0;
  background: rgba(255,255,255,.1);
  opacity: 0; transition: opacity .2s;
}
.upgrade-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(75,124,255,.55); }
.upgrade-btn:hover::after { opacity: 1; }
.upgrade-btn:active { transform: scale(.98); }
.upgrade-btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

/* History */
.history-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 0; border-bottom: 1px solid var(--border);
}
.history-item:last-child { border-bottom: none; }
.history-item__result {
  width: 28px; height: 28px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; flex-shrink: 0;
}
.history-item__result--win  { background: rgba(34,197,94,.15); }
.history-item__result--lose { background: rgba(239,68,68,.15); }
.history-item__skins { flex: 1; font-size: 12px; }
.history-item__from { color: var(--text3); }
.history-item__to   { font-weight: 600; }
.history-item__chance { font-size: 12px; color: var(--text3); white-space: nowrap; }

/* Result overlay */
.upgrade-result {
  position: fixed; inset: 0; z-index: 2000;
  background: rgba(7,11,24,.95);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity .4s;
}
.upgrade-result.show { opacity: 1; pointer-events: all; }
.upgrade-result__card {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: var(--r-xl);
  padding: 48px 40px;
  text-align: center; max-width: 420px;
  transform: scale(.9); transition: transform .4s var(--ease-spring);
}
.upgrade-result.show .upgrade-result__card { transform: scale(1); }
.upgrade-result__icon { font-size: 64px; margin-bottom: 16px; }
.upgrade-result__title { font-size: 28px; font-weight: 800; margin-bottom: 8px; }
.upgrade-result__desc  { color: var(--text2); margin-bottom: 24px; }
.upgrade-result__skin img { width: 180px; height: 130px; object-fit: contain; margin: 0 auto 12px; }
.upgrade-result__skin-name { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
.upgrade-result__skin-price { font-size: 26px; font-weight: 800; color: var(--warning); margin-bottom: 24px; }

@media (max-width: 1100px) { .upgrade-layout { grid-template-columns: 1fr 300px 1fr; } }
@media (max-width: 900px)  { .upgrade-layout { grid-template-columns: 1fr; } }