.efficiency-main {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
}

.efficiency-title {
  margin-bottom: 24px;
}

.efficiency-title p {
  margin: 0 0 6px;
  color: var(--color-text-muted);
  font-size: 0.76rem;
}

.efficiency-title p:last-child {
  margin-top: 6px;
}

.efficiency-title a {
  color: inherit;
  text-decoration: none;
}

.efficiency-title a:hover {
  color: var(--color-primary);
}

.efficiency-title h2 {
  margin: 0;
  font-size: 1.25rem;
}

.efficiency-tool {
  display: grid;
  gap: 18px;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.efficiency-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.efficiency-grid-time {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.efficiency-field {
  display: grid;
  gap: 6px;
  color: var(--color-text-muted);
  font-size: 0.76rem;
  font-weight: 700;
}

.efficiency-field input,
.calculator-form input,
.calculator-form output {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-control);
  color: var(--color-text);
  font-family: ui-monospace, "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  padding: 7px 10px;
}

.duration-fields {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.duration-fields legend {
  margin-bottom: 8px;
  color: var(--color-text-muted);
  font-size: 0.76rem;
  font-weight: 700;
}

.target-field {
  max-width: 200px;
}

.efficiency-button,
.efficiency-result button,
.history-head button,
.calculator-form button,
.calculator-keys button {
  min-height: 38px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-control);
  color: var(--color-text);
  cursor: pointer;
  font-weight: 700;
}

.efficiency-button {
  padding: 8px 14px;
}

.efficiency-button.is-primary {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: #ffffff;
}

.efficiency-button:hover,
.efficiency-result button:hover,
.history-head button:hover,
.calculator-form button:hover,
.calculator-keys button:hover {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: #ffffff;
}

.efficiency-status {
  min-height: 1.6em;
  margin: 12px 0 0;
  color: var(--color-text-muted);
  font-size: 0.76rem;
}

.efficiency-status.is-error {
  color: #fca5a5;
}

.efficiency-result,
.efficiency-history,
.mini-calculator {
  margin-top: 24px;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 18px 0;
}

.result-head,
.history-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.result-head h3,
.history-head h3 {
  margin: 0;
  font-size: 0.95rem;
}

.efficiency-result button,
.history-head button {
  min-height: 30px;
  padding: 4px 10px;
  font-size: 0.72rem;
}

.efficiency-details {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 18px;
  margin: 18px 0 0;
}

.efficiency-details div {
  min-width: 0;
}

.efficiency-details dt {
  color: var(--color-text-muted);
  font-size: 0.68rem;
}

.efficiency-details dd {
  margin: 3px 0 0;
  overflow-wrap: anywhere;
  font-family: ui-monospace, "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-size: 0.84rem;
}

.efficiency-details .is-emphasis dd {
  color: var(--color-accent-light);
  font-size: 1.1rem;
  font-weight: 700;
}

.efficiency-details .is-wide {
  grid-column: 1 / -1;
}

.efficiency-history {
  padding-bottom: 14px;
}

.efficiency-history ul {
  display: grid;
  gap: 6px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.efficiency-history li button {
  width: 100%;
  overflow: hidden;
  border: 0;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 0.76rem;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.efficiency-history li button:hover {
  color: var(--color-primary);
}

.mini-calculator summary {
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 700;
}

.mini-calculator[open] summary {
  margin-bottom: 16px;
}

.calculator-form {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
}

.calculator-form label {
  color: var(--color-text-muted);
  font-size: 0.72rem;
}

.calculator-form output {
  grid-column: 2;
}

.calculator-form button {
  grid-row: 1 / span 2;
  grid-column: 3;
  height: 100%;
  padding: 6px 12px;
}

.calculator-keys {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
  margin-top: 12px;
}

.calculator-keys button {
  min-height: 34px;
}

@media (max-width: 520px) {
  .efficiency-tool {
    padding: 16px;
  }

  .efficiency-grid,
  .efficiency-grid-time,
  .efficiency-details {
    grid-template-columns: 1fr;
  }

  .efficiency-details .is-wide {
    grid-column: auto;
  }

  .target-field {
    max-width: none;
  }

  .calculator-form {
    grid-template-columns: 1fr;
  }

  .calculator-form label,
  .calculator-form output,
  .calculator-form button {
    grid-column: auto;
    grid-row: auto;
  }
}