:root {
  --bg: #070a12;
  --card: rgba(255, 255, 255, 0.06);
  --card2: rgba(255, 255, 255, 0.08);
  --ink: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.62);
  --faint: rgba(255, 255, 255, 0.12);
  --ring: rgba(122, 162, 247, 0.85);
  --mono: "DM Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: "DM Sans", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  background:
    radial-gradient(900px 500px at 20% 10%, rgba(122, 162, 247, 0.20), transparent 60%),
    radial-gradient(900px 600px at 80% 0%, rgba(167, 139, 250, 0.16), transparent 60%),
    radial-gradient(900px 800px at 70% 90%, rgba(52, 211, 153, 0.10), transparent 60%),
    linear-gradient(180deg, #070a12 0%, #060711 100%);
  overflow-x: hidden;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(7, 10, 18, 0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--faint);
}

.topbar__inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.25rem 1.25rem;
  max-width: 1400px;
  margin: 0 auto;
}

.kicker {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(122, 162, 247, 0.9);
  margin-bottom: 0.35rem;
}

.title {
  margin: 0;
  font-size: clamp(1.4rem, 2.4vw, 2.1rem);
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0.35rem 0 0;
  color: var(--muted);
  max-width: 56ch;
}

.controls {
  display: flex;
  align-items: end;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.control {
  display: grid;
  gap: 0.35rem;
  align-items: start;
}

.control__label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.control__select {
  appearance: none;
  border: 1px solid var(--faint);
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink);
  padding: 0.55rem 0.7rem;
  border-radius: 12px;
  font-family: var(--mono);
  font-size: 0.75rem;
}

.button {
  border: 1px solid var(--faint);
  background: rgba(255, 255, 255, 0.06);
  color: var(--ink);
  padding: 0.55rem 0.8rem;
  border-radius: 12px;
  font-family: var(--mono);
  font-size: 0.75rem;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.18s ease;
}

.button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.button:not(:disabled):hover {
  background: rgba(255, 255, 255, 0.09);
}

.button:not(:disabled):active {
  transform: translateY(1px);
}

.wrap {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.1rem 1.25rem 2.25rem;
}

.tableCard {
  border: 1px solid var(--faint);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
  border-radius: 18px;
  padding: 1rem;
  box-shadow: 0 18px 70px rgba(0, 0, 0, 0.28);
}

.legend {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.6rem 0.9rem;
  padding: 0.35rem 0.2rem 0.9rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.7rem;
}

.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.swatch {
  width: 12px;
  height: 12px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.table {
  position: relative;
  display: grid;
  grid-template-columns: repeat(18, minmax(42px, 1fr));
  grid-template-rows: repeat(9, minmax(48px, auto));
  gap: 6px;
  padding: 0.5rem 0.2rem 0.3rem;
}

.element {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto 1fr auto;
  gap: 2px 6px;
  padding: 8px 8px 7px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: var(--card);
  cursor: pointer;
  user-select: none;
  outline: none;
  transition: transform 0.12s ease, background 0.18s ease, border-color 0.18s ease;
  min-height: 48px;
}

.element:hover {
  background: var(--card2);
  transform: translateY(-1px);
}

.element:focus-visible {
  box-shadow: 0 0 0 3px var(--ring);
}

.element.is-dim {
  opacity: 0.25;
  filter: saturate(0.6);
}

.element__num {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: rgba(255, 255, 255, 0.68);
}

.element__symbol {
  font-family: var(--mono);
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  font-weight: 500;
}

.element__name {
  grid-column: 1 / -1;
  font-size: 0.66rem;
  color: rgba(255, 255, 255, 0.70);
  line-height: 1.15;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.element__mass {
  grid-column: 1 / -1;
  font-family: var(--mono);
  font-size: 0.62rem;
  color: rgba(255, 255, 255, 0.55);
}

.hint {
  margin: 0.9rem 0.2rem 0.1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

kbd {
  font-family: var(--mono);
  font-size: 0.75em;
  padding: 0.1rem 0.35rem;
  border-radius: 8px;
  border: 1px solid var(--faint);
  background: rgba(255, 255, 255, 0.06);
}

/* Tooltip */
.tooltip {
  position: fixed;
  top: 0;
  left: 0;
  width: min(360px, calc(100vw - 28px));
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(10, 14, 26, 0.92);
  backdrop-filter: blur(18px);
  box-shadow: 0 22px 80px rgba(0, 0, 0, 0.55);
  padding: 0.85rem 0.9rem 0.8rem;
  transform: translate3d(-9999px, -9999px, 0);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.12s ease;
}

.tooltip.is-visible {
  opacity: 1;
}

.tooltip__header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem;
  align-items: center;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  margin-bottom: 0.55rem;
}

.tooltip__symbol {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 1.2rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.tooltip__name {
  font-weight: 600;
  letter-spacing: -0.01em;
}

.tooltip__cat {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 0.15rem;
}

.tooltip__num {
  font-family: var(--mono);
  font-size: 1.0rem;
  color: rgba(255, 255, 255, 0.78);
}

.tooltip__grid {
  display: grid;
  gap: 0.35rem;
}

.tooltip__row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 0.65rem;
  align-items: baseline;
}

.tooltip__label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.62);
}

.tooltip__value {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: rgba(255, 255, 255, 0.92);
  text-align: right;
}

.tooltip__footer {
  margin-top: 0.6rem;
  padding-top: 0.55rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--muted);
}

.tooltip__pin {
  color: rgba(255, 255, 255, 0.78);
}

.tooltip__muted {
  color: rgba(255, 255, 255, 0.50);
}

/* Category colors (swatches + element top border) */
.swatch--alkali { background: rgba(244, 63, 94, 0.65); }
.swatch--alkaline { background: rgba(251, 146, 60, 0.65); }
.swatch--transition { background: rgba(59, 130, 246, 0.65); }
.swatch--post { background: rgba(168, 85, 247, 0.65); }
.swatch--metalloid { background: rgba(34, 197, 94, 0.65); }
.swatch--nonmetal { background: rgba(14, 165, 233, 0.65); }
.swatch--halogen { background: rgba(250, 204, 21, 0.65); }
.swatch--noble { background: rgba(99, 102, 241, 0.65); }
.swatch--lanth { background: rgba(45, 212, 191, 0.65); }
.swatch--act { background: rgba(16, 185, 129, 0.65); }

.element[data-category="alkali metal"] { border-top: 2px solid rgba(244, 63, 94, 0.95); }
.element[data-category="alkaline earth metal"] { border-top: 2px solid rgba(251, 146, 60, 0.95); }
.element[data-category="transition metal"] { border-top: 2px solid rgba(59, 130, 246, 0.95); }
.element[data-category="post-transition metal"] { border-top: 2px solid rgba(168, 85, 247, 0.95); }
.element[data-category="metalloid"] { border-top: 2px solid rgba(34, 197, 94, 0.95); }
.element[data-category="nonmetal"] { border-top: 2px solid rgba(14, 165, 233, 0.95); }
.element[data-category="halogen"] { border-top: 2px solid rgba(250, 204, 21, 0.95); }
.element[data-category="noble gas"] { border-top: 2px solid rgba(99, 102, 241, 0.95); }
.element[data-category="lanthanide"] { border-top: 2px solid rgba(45, 212, 191, 0.95); }
.element[data-category="actinide"] { border-top: 2px solid rgba(16, 185, 129, 0.95); }
.element[data-category="unknown"] { border-top: 2px solid rgba(148, 163, 184, 0.85); }

@media (max-width: 1100px) {
  .legend { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .table {
    grid-template-columns: repeat(18, minmax(34px, 1fr));
    gap: 5px;
  }
  .element__name,
  .element__mass {
    display: none;
  }
}

@media (max-width: 800px) {
  .topbar__inner { align-items: start; flex-direction: column; }
  .controls { justify-content: flex-start; }
  .tableCard { padding: 0.85rem; }
  .table { grid-template-columns: repeat(18, minmax(30px, 1fr)); }
  .element { padding: 7px 7px 6px; }
}