/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.01em;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.1);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover::after { opacity: 1; }
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(99,102,241,0.35);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(99,102,241,0.5);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-ghost:hover {
  background: rgba(99,102,241,0.08);
  transform: translateY(-2px);
}

.btn-calculate {
  width: 100%;
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-base);
  border-radius: var(--radius-lg);
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(99,102,241,0.3);
  margin-top: var(--space-2);
  position: relative;
}

.btn-calculate:hover {
  box-shadow: 0 6px 25px rgba(99,102,241,0.45);
  transform: translateY(-2px);
}

.btn-calculate.loading {
  pointer-events: none;
  opacity: 0.8;
}

.btn-calculate.loading::before {
  content: '';
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin-right: var(--space-2);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

.btn-xs {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  border-radius: var(--radius-md);
}

/* GST Rate Pill Buttons */
.rate-pills {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.rate-pill {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: 1.5px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.rate-pill:hover { border-color: var(--color-primary); color: var(--color-primary); }
.rate-pill.active { background: var(--color-primary); border-color: var(--color-primary); color: white; }

/* ============================================
   CALCULATOR CARD
   ============================================ */
.calculator-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow var(--transition-base);
}

.calculator-card:hover {
  box-shadow: var(--shadow-lg);
}

/* Inputs Panel */
.calc-inputs {
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

/* Results Panel */
.calc-results {
  padding: var(--space-8);
  background: var(--bg-card);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  min-height: 400px;
}

/* ============================================
   INPUT GROUP
   ============================================ */
.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.input-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.input-label-hint {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-weight: var(--font-weight-normal);
}

.input-row {
  display: flex;
  align-items: center;
  background: var(--bg-input);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-row:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.12);
  background: var(--bg-input-focus);
}

.input-row input[type="number"] {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  background: transparent;
  border: none;
  outline: none;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  min-width: 0;
}

.input-row input[type="number"]::-webkit-inner-spin-button,
.input-row input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.input-unit {
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-muted);
  background: var(--bg-input);
  border-left: 1px solid var(--border-color);
  white-space: nowrap;
}

/* Range Slider */
.slider-wrap {
  position: relative;
  padding: var(--space-1) 0;
}

input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 5px;
  border-radius: var(--radius-full);
  background: var(--border-color);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(99,102,241,0.4);
  border: 2px solid white;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 3px 12px rgba(99,102,241,0.5);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 2px 8px rgba(99,102,241,0.4);
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-1);
}

.slider-labels span {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* ============================================
   SELECT INPUT
   ============================================ */
.select-wrap {
  position: relative;
}

.select-wrap::after {
  content: '▾';
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  font-size: var(--font-size-xs);
}

select.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-10) var(--space-3) var(--space-4);
  background: var(--bg-input);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  outline: none;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

select.form-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.12);
}

/* ============================================
   TOGGLE SWITCH
   ============================================ */
.toggle-group {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.toggle-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
}

.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.toggle-switch input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border-color-strong);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background: white;
  border-radius: 50%;
  transition: transform var(--transition-fast);
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--color-primary);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

/* Toggle Tabs (e.g. Add GST / Remove GST) */
.tab-toggle {
  display: flex;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3px;
  gap: 3px;
}

.tab-toggle button {
  flex: 1;
  padding: var(--space-2) var(--space-4);
  border-radius: calc(var(--radius-lg) - 2px);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  background: transparent;
  border: none;
  cursor: pointer;
}

.tab-toggle button.active {
  background: var(--bg-card);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

/* ============================================
   RESULT CARDS
   ============================================ */
.result-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.result-cards.three-col {
  grid-template-columns: repeat(3, 1fr);
}

.result-card {
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-5) var(--space-5);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  position: relative;
  overflow: hidden;
}

.result-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-accent, var(--color-primary));
}

.result-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.result-card.primary {
  background: var(--gradient-primary);
  border: none;
  grid-column: 1 / -1;
}

.result-card.primary .result-label { color: rgba(255,255,255,0.75); }
.result-card.primary .result-value { color: #ffffff; }

.result-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  margin-bottom: var(--space-2);
}

.result-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--text-primary);
  letter-spacing: var(--letter-spacing-tight);
  line-height: 1.1;
}

.result-value.large {
  font-size: var(--font-size-3xl);
}

/* ============================================
   CHART CONTAINERS
   ============================================ */
.chart-container {
  position: relative;
  width: 100%;
}

.chart-container canvas {
  max-height: 300px;
}

.chart-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
}

/* ============================================
   AMORTIZATION TABLE
   ============================================ */
.amortization-section {
  border-top: 1px solid var(--border-color);
  padding-top: var(--space-5);
}

.amortization-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-height: 340px;
  overflow-y: auto;
}

/* ============================================
   COMPARISON TABLE
   ============================================ */
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

.comparison-input-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
}

.comparison-input-card h4 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

/* ============================================
   SALARY BREAKDOWN TABLE
   ============================================ */
.breakdown-table {
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.breakdown-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--border-color);
  font-size: var(--font-size-sm);
  transition: background var(--transition-fast);
}

.breakdown-row:last-child { border-bottom: none; }
.breakdown-row:hover { background: var(--bg-card); }

.breakdown-row.header {
  background: var(--bg-input);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

.breakdown-row.total {
  background: var(--bg-card);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  border-top: 2px solid var(--border-color-strong);
}

.breakdown-label { color: var(--text-secondary); }
.breakdown-value { font-weight: var(--font-weight-semibold); color: var(--text-primary); }
.breakdown-value.positive { color: var(--color-success); }
.breakdown-value.negative { color: var(--color-error); }

/* ============================================
   ERROR STATE
   ============================================ */
.input-error {
  font-size: var(--font-size-xs);
  color: var(--color-error);
  margin-top: var(--space-1);
  display: none;
}

.input-group.has-error .input-row {
  border-color: var(--color-error);
}

.input-group.has-error .input-error {
  display: block;
}

/* ============================================
   EMPTY STATE (before calculation)
   ============================================ */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  text-align: center;
  color: var(--text-muted);
  gap: var(--space-3);
}

.empty-state-icon {
  font-size: 3rem;
  opacity: 0.4;
}

.empty-state-text {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* ============================================
   INFO BOX
   ============================================ */
.info-box {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  background: rgba(59,130,246,0.06);
  border: 1px solid rgba(59,130,246,0.15);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.info-box-icon { font-size: 1.125rem; flex-shrink: 0; }

/* ============================================
   REGIME COMPARISON (Income Tax)
   ============================================ */
.regime-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.regime-card {
  background: var(--bg-body);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  transition: all var(--transition-base);
}

.regime-card.recommended {
  border-color: var(--color-success);
  background: rgba(16,185,129,0.04);
}

.regime-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.regime-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

.regime-tax {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--text-primary);
  letter-spacing: var(--letter-spacing-tight);
  margin-bottom: var(--space-1);
}

.regime-saving {
  font-size: var(--font-size-xs);
  color: var(--color-success);
  font-weight: var(--font-weight-semibold);
}

/* ============================================
   SLAB TABLE
   ============================================ */
.slab-table-wrap {
  overflow: hidden;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

/* ============================================
   BEST DEAL BADGE
   ============================================ */
.best-deal-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  background: var(--gradient-success);
  color: white;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  box-shadow: 0 2px 8px rgba(16,185,129,0.3);
}