/* 计算工具页面 */
.calc-page {
  padding: 24px 28px 40px;
  max-width: 1400px;
}

.calc-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 22px;
}

.calc-section-label {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--brand);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.calc-title {
  font-size: 28px;
  font-weight: 700;
  margin: 0;
  color: var(--ink);
}

.calc-tool-count {
  color: var(--muted);
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.calc-tool-count span {
  font-size: 36px;
  font-weight: 700;
  color: var(--brand);
  line-height: 1;
}

/* Tabs */
.calc-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 22px;
}

.calc-tab {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: var(--bg-soft-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  color: var(--ink-soft);
  cursor: pointer;
  transition: all .2s;
  text-align: left;
}

.calc-tab:hover {
  border-color: var(--brand);
  color: var(--ink);
}

.calc-tab.active {
  background: var(--brand-soft);
  border-color: var(--brand);
  color: var(--brand);
  box-shadow: 0 0 18px rgba(0, 221, 136, 0.12);
}

.calc-tab-icon {
  font-size: 20px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  background: var(--bg-soft-3);
  border-radius: 8px;
  border: 1px solid var(--line-soft);
}

.calc-tab.active .calc-tab-icon {
  background: rgba(0, 221, 136, 0.12);
  border-color: rgba(0, 221, 136, 0.25);
}

.calc-tab-text {
  font-weight: 600;
  font-size: 14px;
}

.calc-tab-en {
  margin-left: auto;
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--muted-2);
  text-transform: uppercase;
}

.calc-tab.active .calc-tab-en {
  color: var(--brand-dark);
}

/* Body */
.calc-body {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 22px;
  align-items: start;
}

.calc-workspace {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 22px;
  align-items: start;
}

/* Card */
.calc-card {
  background: var(--bg-soft-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  padding: 22px;
}

.calc-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 18px;
}

.calc-card-title {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
}

/* Table */
.calc-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  margin-bottom: 16px;
}

.calc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.calc-table th,
.calc-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
  white-space: nowrap;
}

.calc-table th {
  background: var(--bg-soft-3);
  color: var(--muted);
  font-weight: 500;
  font-size: 12px;
}

.calc-table tr:last-child td {
  border-bottom: none;
}

.calc-row-no {
  color: var(--brand);
  font-weight: 600;
  font-size: 12px;
}

.calc-input {
  min-width: 70px;
  width: 100%;
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 8px 10px;
  color: var(--ink);
  font-size: 13px;
}

.calc-input:focus {
  outline: none;
  border-color: var(--brand);
}

.calc-select {
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 8px 10px;
  color: var(--ink);
  font-size: 13px;
  min-width: 70px;
}

.calc-cell-cbm {
  color: var(--brand);
  font-weight: 600;
  font-family: 'SF Mono', monospace;
}

.calc-row-del {
  background: transparent;
  border: none;
  color: var(--muted-2);
  cursor: pointer;
  font-size: 15px;
  padding: 4px;
  border-radius: 6px;
}

.calc-row-del:hover:not(:disabled) {
  background: rgba(255, 107, 107, 0.12);
  color: var(--danger);
}

.calc-row-del:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* Result panel */
.calc-result-panel {
  background: var(--bg-soft-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  padding: 28px 22px;
  text-align: center;
  position: sticky;
  top: 16px;
}

.calc-result-icon {
  font-size: 32px;
  margin-bottom: 10px;
}

.calc-result-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.calc-result-value {
  font-size: 42px;
  font-weight: 700;
  color: var(--brand);
  line-height: 1.1;
  word-break: break-all;
}

.calc-result-unit {
  font-size: 13px;
  color: var(--muted-2);
  margin-top: 6px;
}

.calc-result-meta {
  margin-top: 24px;
  text-align: left;
  border-top: 1px solid var(--line-soft);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.calc-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}

.calc-meta-row span {
  color: var(--muted);
}

.calc-meta-row strong {
  color: var(--ink);
  font-weight: 600;
}

/* Actions */
.calc-actions-bar {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

/* Weight */
.calc-weight-row {
  display: grid;
  grid-template-columns: 1fr 160px 40px 160px;
  gap: 14px;
  align-items: end;
  margin-top: 30px;
}

.calc-field label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
}

.calc-lg-input {
  font-size: 16px;
  padding: 12px 14px;
}

.calc-arrow {
  color: var(--brand);
  font-size: 20px;
  font-weight: 700;
  text-align: center;
  padding-bottom: 10px;
}

/* Load */
.calc-load-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.calc-load-dims {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.calc-slider-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.calc-slider-value {
  color: var(--brand);
  font-weight: 600;
}

.calc-slider {
  width: 100%;
  accent-color: var(--brand);
  height: 6px;
  border-radius: 3px;
  background: var(--bg-soft-3);
  -webkit-appearance: none;
  appearance: none;
}

.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--brand);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(0, 221, 136, 0.3);
}

/* Standard Calculator */
.calc-calc-card {
  max-width: 420px;
}

.calc-calc-display {
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  padding: 18px 20px;
  text-align: right;
  margin-bottom: 16px;
}

.calc-calc-label {
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--muted-2);
  text-transform: uppercase;
}

.calc-calc-result {
  font-size: 36px;
  font-weight: 700;
  color: var(--brand);
  margin-top: 6px;
  word-break: break-all;
  min-height: 46px;
}

.calc-calc-keys {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.calc-key {
  aspect-ratio: 1;
  background: var(--bg-soft-3);
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}

.calc-key:hover {
  border-color: var(--brand);
}

.calc-key.op {
  background: rgba(0, 221, 136, 0.12);
  color: var(--brand);
  border-color: rgba(0, 221, 136, 0.2);
}

.calc-key.eq {
  background: var(--brand);
  color: var(--brand-ink);
  border-color: var(--brand);
}

.calc-key.fn {
  color: var(--muted);
}

/* History */
.calc-history {
  background: var(--bg-soft-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  padding: 18px;
  min-height: 160px;
}

.calc-history-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.calc-history-title {
  font-weight: 700;
  font-size: 14px;
}

.calc-history-empty {
  color: var(--muted-2);
  font-size: 13px;
  text-align: center;
  padding: 24px 0;
}

.calc-history-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.calc-history-item {
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  padding: 10px 12px;
  position: relative;
}

.calc-history-meta {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 4px;
}

.calc-history-result {
  font-size: 13px;
  color: var(--brand);
  font-weight: 600;
  word-break: break-all;
  padding-right: 18px;
}

.calc-history-del {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--muted-2);
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 14px;
  line-height: 1;
}

.calc-history-del:hover {
  background: rgba(255, 107, 107, 0.15);
  color: var(--danger);
}

/* Responsive */
@media (max-width: 1200px) {
  .calc-body {
    grid-template-columns: 1fr;
  }
  .calc-workspace {
    grid-template-columns: 1fr;
  }
  .calc-result-panel {
    position: static;
  }
}

@media (max-width: 900px) {
  .calc-tabs {
    grid-template-columns: repeat(2, 1fr);
  }
  .calc-weight-row,
  .calc-load-dims {
    grid-template-columns: 1fr 1fr;
  }
  .calc-arrow {
    display: none;
  }
}