/* ==========================================================================
   CALCULATOR UI, KPI CARDS, TABLES, BREAKDOWNS, FORMULAS & COMPARISON
   ========================================================================== */

/* Calculator Layout Grid */
.calc-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: start;
  margin-bottom: 3rem;
}

@media (max-width: 960px) {
  .calc-layout {
    grid-template-columns: 1fr;
  }
}

/* Calculator Header */
.calc-header {
  margin-bottom: 2rem;
}

.calc-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.calc-breadcrumb a {
  color: var(--text-muted);
}

.calc-breadcrumb a:hover {
  color: var(--color-secondary);
}

.calc-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.calc-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.calc-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 750px;
}

/* Calculator Input Panel */
.calc-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.calc-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.calc-panel-title {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.calc-form-group {
  margin-bottom: 1.5rem;
}

.calc-form-group:last-child {
  margin-bottom: 0;
}

.calc-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.calc-label {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.calc-help-tooltip {
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.85rem;
  position: relative;
  display: inline-flex;
}

.calc-help-tooltip:hover {
  color: var(--color-secondary);
}

.calc-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.calc-input-prefix, .calc-input-suffix {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  pointer-events: none;
  z-index: 2;
}

.calc-input-prefix { left: 1rem; }
.calc-input-suffix { right: 1rem; }

.calc-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1.1rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-color);
  background-color: var(--bg-input);
  color: var(--text-primary);
  transition: var(--transition);
  font-variant-numeric: tabular-nums;
}

.calc-input.has-prefix { padding-left: 2.25rem; }
.calc-input.has-suffix { padding-right: 2.75rem; }

.calc-input:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px var(--color-secondary-soft);
}

/* Slider Controls */
.calc-slider-wrapper {
  margin-top: 0.65rem;
}

.calc-slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border-color);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  accent-color: var(--color-secondary);
}

.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-secondary);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(20, 134, 109, 0.4);
  transition: transform 0.1s ease;
}

.calc-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* Preset Chips */
.calc-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.calc-preset-chip {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.calc-preset-chip:hover, .calc-preset-chip.active {
  background-color: var(--color-secondary);
  color: #FFFFFF;
  border-color: var(--color-secondary);
}

/* Radio / Select Toggle Tabs */
.calc-toggle-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: 0.35rem;
  background: var(--bg-surface);
  padding: 0.35rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.calc-toggle-btn {
  background: transparent;
  border: none;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.calc-toggle-btn.active {
  background: var(--bg-card);
  color: var(--color-primary);
  box-shadow: var(--shadow-xs);
}

[data-theme="dark"] .calc-toggle-btn.active {
  color: #FFFFFF;
  background: var(--color-primary-light);
}

/* Result Panel */
.calc-result-panel {
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.calc-summary-card {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.calc-summary-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-secondary) 0%, var(--color-accent) 100%);
}

.calc-primary-kpi {
  text-align: center;
  padding: 1rem 0 1.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.calc-kpi-label {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}

.calc-kpi-val {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--color-primary);
  letter-spacing: -0.03em;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

[data-theme="dark"] .calc-kpi-val {
  color: #FFFFFF;
}

.calc-kpi-sub {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 0.35rem;
}

/* Secondary KPI Grid */
.calc-kpi-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1.25rem;
}

.calc-sub-kpi {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.calc-sub-kpi-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.calc-sub-kpi-val {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.calc-sub-kpi-delta {
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.delta-positive { color: var(--color-positive); }
.delta-negative { color: var(--color-negative); }

/* Visualization Chart Box */
.calc-chart-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.calc-chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.calc-chart-title {
  font-size: 1rem;
  font-weight: 700;
}

.calc-chart-container {
  position: relative;
  width: 100%;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Result Utility Action Bar */
.calc-export-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Scenario Comparison Split View */
.comparison-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-sm);
}

.comparison-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  position: relative;
}

@media (max-width: 800px) {
  .comparison-grid {
    grid-template-columns: 1fr;
  }
}

.scenario-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.scenario-badge {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-pill);
  display: inline-block;
  margin-bottom: 1rem;
}

.scenario-a-badge {
  background: var(--color-primary);
  color: #FFFFFF;
}

.scenario-b-badge {
  background: var(--color-secondary);
  color: #FFFFFF;
}

.comparison-diff-card {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(20, 134, 109, 0.08) 0%, rgba(228, 183, 90, 0.08) 100%);
  border: 1.5px solid var(--color-secondary);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.diff-metric {
  text-align: center;
}

.diff-metric-label {
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
}

.diff-metric-val {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--color-secondary);
}

/* Interactive Schedule / Table Section */
.calc-table-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-sm);
}

.calc-table-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  max-height: 480px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.financial-table {
  width: 100%;
  border-collapse: collapse;
  text-align: right;
  font-size: 0.9rem;
}

.financial-table th, .financial-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.financial-table th {
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 0.825rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: sticky;
  top: 0;
  z-index: 10;
}

.financial-table th:first-child, .financial-table td:first-child {
  text-align: left;
}

.financial-table tr:hover td {
  background-color: var(--bg-surface);
}

/* Formula & Math Section */
.formula-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
}

.math-display {
  background: var(--bg-surface);
  border-left: 4px solid var(--color-secondary);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--color-primary);
  margin: 1.25rem 0;
  overflow-x: auto;
}

[data-theme="dark"] .math-display {
  color: #FFFFFF;
}

/* Step-by-Step Breakdown */
.step-breakdown {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1.5rem 0;
}

.step-card {
  display: flex;
  gap: 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  flex-shrink: 0;
}

.step-content h5 {
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

.step-content p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Tool Chain Stepper */
.toolchain-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 3rem;
}

.toolchain-steps {
  display: flex;
  align-items: center;
  gap: 1rem;
  overflow-x: auto;
  padding: 1rem 0;
}

.toolchain-step {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  min-width: 190px;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  text-decoration: none;
  transition: var(--transition);
}

.toolchain-step:hover {
  border-color: var(--color-secondary);
  transform: translateY(-2px);
}

.toolchain-step.current {
  border-color: var(--color-secondary);
  background: var(--color-secondary-soft);
}

.toolchain-step-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-secondary);
  text-transform: uppercase;
}

.toolchain-step-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.toolchain-arrow {
  color: var(--text-muted);
  font-size: 1.25rem;
}

/* FAQs Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--text-muted);
}

.faq-question {
  padding: 1.25rem 1.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq-question::after {
  content: "+";
  font-size: 1.35rem;
  color: var(--color-secondary);
  transition: transform 0.2s ease;
}

.faq-item.open .faq-question::after {
  content: "−";
}

.faq-answer {
  padding: 0 1.5rem 1.25rem 1.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  display: none;
}

.faq-item.open .faq-answer {
  display: block;
}

/* Disclaimer & Educational Notice */
.educational-notice {
  background: rgba(228, 183, 90, 0.1);
  border: 1px solid rgba(228, 183, 90, 0.4);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 2rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.educational-notice-icon {
  color: #B48425;
  font-size: 1.35rem;
  flex-shrink: 0;
  margin-top: 2px;
}

[data-theme="dark"] .educational-notice-icon {
  color: var(--color-accent);
}

.educational-notice-content h5 {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.educational-notice-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}