.page-shell {
  padding-bottom: 58px;
}

.calculator {
  margin: 34px auto 0;
  padding: 28px 30px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  box-shadow: var(--shadow);
}

.calculator > label {
  display: block;
  margin-bottom: 12px;
  color: var(--ink);
  font-size: 1rem;
  font-weight: 700;
}

.input-row {
  display: block;
}

.formula-field {
  position: relative;
  min-width: 0;
}

.formula-field input {
  width: 100%;
  height: 56px;
  padding: 0 110px 0 18px;
  border: 1px solid #7d8998;
  border-radius: 6px;
  outline: none;
  background: #ffffff;
  color: var(--ink);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 20px;
  letter-spacing: 0.02em;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.formula-field input:hover {
  border-color: var(--accent);
}

.formula-field input:focus {
  border-color: var(--accent);
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: none;
}

.formula-field > span {
  position: absolute;
  top: 50%;
  right: 15px;
  padding: 4px 9px;
  transform: translateY(-50%);
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
}

.formula-field--error input {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(190, 61, 74, 0.1);
}

.formula-field--error input:hover,
.formula-field--error input:focus {
  border-color: var(--danger);
}

.formula-field--error input:focus {
  outline-color: var(--danger);
  box-shadow: none;
}

.field-message {
  min-height: 20px;
  margin-top: 9px;
}

.field-message p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.field-message--error {
  color: var(--danger);
  font-weight: 650;
}

.key-results {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.key-result {
  min-width: 0;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  box-shadow: 0 8px 24px rgba(24, 45, 70, 0.06);
}

.key-result--neutral {
  border-color: #a8c2dc;
}

.key-result__label {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.key-result output {
  display: block;
  margin-top: 8px;
  overflow-wrap: anywhere;
  color: var(--ink);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: clamp(25px, 3vw, 32px);
  font-variant-numeric: tabular-nums;
  font-weight: 750;
  letter-spacing: -0.02em;
  line-height: 1.08;
}

.key-result--neutral output {
  color: var(--accent);
}

.key-result > span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
}

.adducts {
  margin-top: 28px;
}

.adducts__heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding: 8px 0 16px;
}

.adducts__heading h2 {
  margin: 4px 0 0;
  color: var(--blue);
  font-size: 1.82rem;
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.22;
}

.adducts__heading > p {
  margin: 0 0 3px;
  color: var(--muted);
  font-size: 12px;
}

.adducts__eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.adduct-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: 18px;
}

.adduct-panel {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  box-shadow: var(--shadow);
}

.adduct-panel__header {
  display: flex;
  min-height: 60px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
}

.adduct-panel__title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.adduct-panel__title h3 {
  margin: 0;
  color: var(--ink);
  font-size: 18px;
  letter-spacing: 0;
}

.adduct-panel__count {
  color: var(--muted);
  font-size: 11px;
}

.adduct-table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

thead {
  background: var(--surface-soft);
}

th,
td {
  height: 52px;
  padding: 0 24px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

thead th {
  height: 42px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

tbody th {
  color: var(--ink);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 14px;
  font-weight: 650;
}

tbody tr:last-child th,
tbody tr:last-child td {
  border-bottom: 0;
}

tbody tr:hover {
  background: var(--accent-soft);
}

td:last-child,
th:last-child {
  text-align: right;
}

tbody output {
  color: var(--ink);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 15px;
  font-weight: 700;
}

.mode {
  display: inline-flex;
  width: 28px;
  height: 24px;
  align-items: center;
  justify-content: center;
  border: 1px solid;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
}

.mode--positive {
  border-color: #a8c2dc;
  background: var(--accent-soft);
  color: var(--accent);
}

.mode--negative {
  border-color: #cbd3dc;
  background: var(--surface-soft);
  color: var(--muted);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

footer {
  margin-top: 26px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

@media (max-width: 760px) {
  .page-shell {
    padding-bottom: 42px;
  }

  .calculator {
    margin-top: 24px;
    padding: 22px 18px 16px;
  }

  .key-results {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .key-result {
    padding: 18px;
  }

  .key-result output {
    font-size: 29px;
  }

  .adducts__heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .adduct-columns {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  th,
  td {
    height: 50px;
    padding: 0 18px;
  }
}

@media (max-width: 420px) {
  .calculator,
  .key-result {
    padding-inline: 16px;
  }

  .formula-field input {
    padding-right: 18px;
    font-size: 18px;
  }

  .formula-field > span {
    display: none;
  }
}