body {
  background: #0f0f1a;
  color: #e8e8f0;
  font-family: 'Segoe UI', Arial, sans-serif;
/*  padding: 20px 10px; */
}

h1 {
  color: #c8d8ff;
  letter-spacing: 2px;
  font-size: 1.6rem;
}

#progress-wrap {
  margin: 0;
  background: #0f0f1a;
/*  padding: 10px 0 4px; */
  border-bottom: 1px solid #1e1e3a;
}

.progress {
  height: 28px;
  background-color: #1e1e3a;
  border-radius: 6px;
}

.progress-bar {
  font-size: 13px;
  font-weight: bold;
  line-height: 28px;
  transition: width 0.5s ease;
}

#progress-label {
  text-align: center;
  font-size: 12px;
  color: #7880a0;
  margin-top: 6px;
  min-height: 18px;
}

.subtitle {
  color: #7880a0;
  font-size: 0.85rem;
  margin-bottom: 24px;
}

#table-wrap {
  overflow-x: auto;
  padding-bottom: 10px;
}

#periodic-table {
  display: grid;
  grid-template-columns: repeat(18, 58px);
  grid-template-rows: repeat(7, 58px) 18px repeat(2, 58px);
  gap: 3px;
  margin: 0 auto;
  width: fit-content;
}

.element {
  border-radius: 5px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2px 3px;
  cursor: default;
  transition: opacity 0.18s ease, transform 0.15s ease, box-shadow 0.15s ease;
  position: relative;
  border: 1px solid rgba(0,0,0,0.25);
}

.elem-num {
  font-size: 8px;
  color: rgba(0,0,0,0.6);
  align-self: flex-start;
  line-height: 1;
  margin-bottom: 1px;
}

.elem-sym {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: #1a1a2e;
}

.elem-name {
  font-size: 6.5px;
  line-height: 1;
  color: rgba(0,0,0,0.65);
  text-align: center;
  width: 100%;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  padding: 0 2px;
}

.element.dimmed {
  opacity: 0.12;
}

.element.highlighted {
  transform: scale(1.1);
  box-shadow: 0 0 12px rgba(255,255,255,0.5), 0 0 4px rgba(255,255,255,0.8);
  z-index: 10;
  border-color: rgba(255,255,255,0.6);
}

.placeholder {
  border: 2px dashed rgba(0,0,0,0.3) !important;
}

.placeholder .elem-sym {
  font-size: 13px;
  color: rgba(0,0,0,0.55);
}

.placeholder .elem-name {
  font-size: 6px;
}

/* Legend */
#legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin: 24px auto 8px;
  width: fit-content;
  max-width: 1100px;
  justify-content: center;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  color: #b0b8d0;
  cursor: default;
  transition: color 0.18s ease, transform 0.15s ease;
}

.legend-item.dimmed {
  opacity: 0.2;
}

.legend-item.highlighted {
  color: #ffffff;
  transform: scale(1.1);
  font-weight: bold;
}

.legend-swatch {
  width: 18px;
  height: 18px;
  border-radius: 3px;
  border: 1px solid rgba(0,0,0,0.3);
  flex-shrink: 0;
}