/**
 * Utility Seva — GST Calculator Styles
 * File: css/gst-calculator.css
 */

/* ==========================================================================
   1. BREADCRUMBS & PAGE WRAPPER
   ========================================================================== */
.breadcrumb-nav-compact {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary, #64748b);
  margin-top: 0.75rem;
  margin-bottom: 0.75rem;
  line-height: 1.2;
}

.breadcrumb-nav-compact a {
  color: var(--text-secondary, #64748b);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease;
  display: inline-flex;
  align-items: center;
}

.breadcrumb-nav-compact a:hover {
  color: var(--primary-color, #2563eb);
}

.breadcrumb-nav-compact .breadcrumb-sep {
  color: var(--text-tertiary, #94a3b8);
  font-size: 0.8rem;
  user-select: none;
  opacity: 0.7;
}

.breadcrumb-nav-compact .breadcrumb-current {
  color: var(--text-primary, #0f172a);
  font-weight: 600;
}

[data-theme="dark"] .breadcrumb-nav-compact .breadcrumb-current {
  color: #f8fafc;
}

.gst-page-wrapper {
  padding: 1rem 0 3.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.gst-header-section {
  text-align: center;
  margin-bottom: 1.75rem;
}

.gst-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.75rem;
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.65rem;
}

[data-theme="dark"] .gst-badge-pill {
  background: rgba(16, 185, 129, 0.18);
  color: #34d399;
  border-color: rgba(52, 211, 153, 0.3);
}

.gst-badge-pill svg {
  width: 13px;
  height: 13px;
}

.gst-page-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary, #0f172a);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

[data-theme="dark"] .gst-page-title {
  color: #f8fafc;
}

.gst-page-subtitle {
  font-size: 0.98rem;
  color: var(--text-secondary, #64748b);
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.5;
}

[data-theme="dark"] .gst-page-subtitle {
  color: #94a3b8;
}

/* ==========================================================================
   2. TWO-COLUMN STAGE CONTAINER
   ========================================================================== */
.gst-stage-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: flex-start;
  margin-bottom: 2.5rem;
}

@media (max-width: 900px) {
  .gst-stage-container {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}

/* Common Card Base */
.gst-card {
  background: var(--card-bg, #ffffff);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

[data-theme="dark"] .gst-card {
  background: var(--card-bg, #1e293b);
  border-color: var(--border-color, #334155);
  box-shadow: 0 4px 12px -2px rgba(0, 0, 0, 0.35);
}

.gst-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color, #e2e8f0);
}

[data-theme="dark"] .gst-card-header {
  border-bottom-color: var(--border-color, #334155);
}

.gst-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary, #0f172a);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

[data-theme="dark"] .gst-card-title {
  color: #f8fafc;
}

.gst-card-title svg {
  width: 1.25rem;
  height: 1.25rem;
  color: #10b981;
}

/* ==========================================================================
   3. LEFT INPUT CARD STYLES
   ========================================================================== */
.gst-form-section {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.gst-field-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.gst-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary, #0f172a);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

[data-theme="dark"] .gst-label {
  color: #e2e8f0;
}

.gst-label-hint {
  font-size: 0.76rem;
  font-weight: 400;
  color: var(--text-secondary, #64748b);
}

[data-theme="dark"] .gst-label-hint {
  color: #94a3b8;
}

/* Mode Switcher Tabs */
.gst-mode-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-secondary, #f1f5f9);
  padding: 0.25rem;
  border-radius: 0.65rem;
  border: 1px solid var(--border-color, #e2e8f0);
  gap: 0.25rem;
}

[data-theme="dark"] .gst-mode-switch {
  background: #0f172a;
  border-color: #334155;
}

.gst-mode-pill {
  border: none;
  background: transparent;
  padding: 0.6rem 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary, #64748b);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  transition: all 0.15s ease;
}

.gst-mode-pill:hover {
  color: var(--text-primary, #0f172a);
}

[data-theme="dark"] .gst-mode-pill:hover {
  color: #f8fafc;
}

.gst-mode-pill.active {
  background: #ffffff;
  color: #059669;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  font-weight: 700;
}

[data-theme="dark"] .gst-mode-pill.active {
  background: #1e293b;
  color: #34d399;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

/* Supply / Transaction Type Switcher */
.gst-tx-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-secondary, #f1f5f9);
  padding: 0.25rem;
  border-radius: 0.65rem;
  border: 1px solid var(--border-color, #e2e8f0);
  gap: 0.25rem;
}

[data-theme="dark"] .gst-tx-switch {
  background: #0f172a;
  border-color: #334155;
}

.gst-tx-pill {
  border: none;
  background: transparent;
  padding: 0.55rem 0.5rem;
  border-radius: 0.5rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary, #64748b);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  transition: all 0.15s ease;
  text-align: center;
}

.gst-tx-pill .tx-sub {
  font-size: 0.72rem;
  font-weight: 400;
  opacity: 0.8;
}

.gst-tx-pill:hover {
  color: var(--text-primary, #0f172a);
}

[data-theme="dark"] .gst-tx-pill:hover {
  color: #f8fafc;
}

.gst-tx-pill.active {
  background: #ffffff;
  color: #2563eb;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  font-weight: 700;
}

[data-theme="dark"] .gst-tx-pill.active {
  background: #1e293b;
  color: #60a5fa;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

/* Input Fields with Currency / Percent Prefix or Suffix */
.gst-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.gst-input-prefix,
.gst-input-suffix {
  position: absolute;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary, #64748b);
  pointer-events: none;
  user-select: none;
}

.gst-input-prefix {
  left: 0.85rem;
}

.gst-input-suffix {
  right: 0.85rem;
}

.gst-input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1.5px solid var(--border-color, #cbd5e1);
  border-radius: 0.55rem;
  background: var(--bg-primary, #ffffff);
  color: var(--text-primary, #0f172a);
  font-size: 1rem;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.gst-input.has-prefix {
  padding-left: 2rem;
}

.gst-input.has-suffix {
  padding-right: 2.2rem;
}

[data-theme="dark"] .gst-input {
  background: #0f172a;
  border-color: #334155;
  color: #f8fafc;
}

.gst-input:focus {
  outline: none;
  border-color: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}

.gst-text-input {
  font-family: 'Inter', sans-serif;
  font-weight: 400;
  font-size: 0.92rem;
}

/* Rate Presets Group */
.gst-rate-presets-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.25rem;
}

.gst-rate-preset-btn {
  flex: 1 1 auto;
  min-width: 44px;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border-color, #cbd5e1);
  background: var(--bg-secondary, #f8fafc);
  border-radius: 0.45rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary, #334155);
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: center;
}

[data-theme="dark"] .gst-rate-preset-btn {
  background: #0f172a;
  border-color: #334155;
  color: #cbd5e1;
}

.gst-rate-preset-btn:hover {
  border-color: #10b981;
  color: #059669;
}

[data-theme="dark"] .gst-rate-preset-btn:hover {
  border-color: #34d399;
  color: #34d399;
}

.gst-rate-preset-btn.active {
  background: #10b981;
  border-color: #10b981;
  color: #ffffff;
  font-weight: 700;
}

[data-theme="dark"] .gst-rate-preset-btn.active {
  background: #059669;
  border-color: #059669;
  color: #ffffff;
}

/* Action Buttons inside Form */
.gst-form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.gst-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem;
  border-radius: 0.55rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  border: none;
}

.gst-btn-primary {
  background: #10b981;
  color: #ffffff;
  flex: 1;
}

.gst-btn-primary:hover {
  background: #059669;
}

.gst-btn-secondary {
  background: var(--bg-secondary, #f1f5f9);
  color: var(--text-primary, #334155);
  border: 1px solid var(--border-color, #cbd5e1);
}

[data-theme="dark"] .gst-btn-secondary {
  background: #0f172a;
  border-color: #334155;
  color: #cbd5e1;
}

.gst-btn-secondary:hover {
  background: var(--border-color, #e2e8f0);
}

[data-theme="dark"] .gst-btn-secondary:hover {
  background: #1e293b;
}

.gst-btn svg {
  width: 1.1rem;
  height: 1.1rem;
}

/* ==========================================================================
   4. RIGHT RESULT CARD STYLES
   ========================================================================== */
.gst-result-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.gst-result-section.hidden {
  display: none;
}

/* Metadata Badges (Party / Product) */
.gst-meta-badges-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.gst-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 0.4rem;
  background: rgba(37, 99, 235, 0.1);
  color: #2563eb;
  border: 1px solid rgba(37, 99, 235, 0.25);
}

[data-theme="dark"] .gst-meta-badge {
  background: rgba(96, 165, 250, 0.15);
  color: #93c5fd;
  border-color: rgba(96, 165, 250, 0.3);
}

.gst-meta-badge svg {
  width: 13px;
  height: 13px;
}

/* Hero Metrics Box */
.gst-hero-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(5, 150, 105, 0.03) 100%);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: 0.85rem;
  padding: 1.25rem;
  text-align: center;
}

[data-theme="dark"] .gst-hero-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(5, 150, 105, 0.05) 100%);
  border-color: rgba(52, 211, 153, 0.25);
}

.gst-hero-label {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary, #64748b);
  margin-bottom: 0.35rem;
}

[data-theme="dark"] .gst-hero-label {
  color: #94a3b8;
}

.gst-hero-amount {
  font-size: 2.2rem;
  font-weight: 800;
  font-family: 'JetBrains Mono', monospace;
  color: #059669;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 0.75rem;
}

[data-theme="dark"] .gst-hero-amount {
  color: #34d399;
}

.gst-sub-metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed rgba(16, 185, 129, 0.3);
}

.gst-sub-metric {
  display: flex;
  flex-direction: column;
}

.gst-sub-metric .sub-lbl {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-secondary, #64748b);
  margin-bottom: 0.15rem;
}

[data-theme="dark"] .gst-sub-metric .sub-lbl {
  color: #94a3b8;
}

.gst-sub-metric .sub-val {
  font-size: 1.1rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-primary, #0f172a);
}

[data-theme="dark"] .gst-sub-metric .sub-val {
  color: #f8fafc;
}

.gst-sub-metric .sub-val.tax-val {
  color: #dc2626;
}

[data-theme="dark"] .gst-sub-metric .sub-val.tax-val {
  color: #f87171;
}

/* Detailed Tax Breakdown Table */
.gst-table-card {
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: 0.75rem;
  overflow: hidden;
}

[data-theme="dark"] .gst-table-card {
  border-color: #334155;
}

.gst-breakdown-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.gst-breakdown-table th,
.gst-breakdown-table td {
  padding: 0.65rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color, #e2e8f0);
}

[data-theme="dark"] .gst-breakdown-table th,
[data-theme="dark"] .gst-breakdown-table td {
  border-bottom-color: #334155;
}

.gst-breakdown-table th {
  background: var(--bg-secondary, #f8fafc);
  font-weight: 600;
  color: var(--text-secondary, #64748b);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

[data-theme="dark"] .gst-breakdown-table th {
  background: #0f172a;
  color: #94a3b8;
}

.gst-breakdown-table td.val-col {
  text-align: right;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  color: var(--text-primary, #0f172a);
}

[data-theme="dark"] .gst-breakdown-table td.val-col {
  color: #f8fafc;
}

.gst-breakdown-table tr.total-row {
  background: rgba(16, 185, 129, 0.05);
}

[data-theme="dark"] .gst-breakdown-table tr.total-row {
  background: rgba(16, 185, 129, 0.1);
}

.gst-breakdown-table tr.total-row td {
  font-weight: 700;
  border-bottom: none;
}

.gst-breakdown-table tr.total-row td.val-col {
  color: #059669;
  font-size: 1.05rem;
}

[data-theme="dark"] .gst-breakdown-table tr.total-row td.val-col {
  color: #34d399;
}

/* Visual Progress Chart */
.gst-chart-container {
  background: var(--bg-secondary, #f8fafc);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: 0.75rem;
  padding: 1rem;
}

[data-theme="dark"] .gst-chart-container {
  background: #0f172a;
  border-color: #334155;
}

.gst-chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary, #64748b);
}

.gst-progress-bar {
  display: flex;
  height: 12px;
  border-radius: 9999px;
  overflow: hidden;
  background: #e2e8f0;
  margin-bottom: 0.75rem;
}

[data-theme="dark"] .gst-progress-bar {
  background: #1e293b;
}

.gst-chart-segment {
  height: 100%;
  transition: width 0.3s ease;
}

.gst-chart-segment.taxable {
  background: #10b981;
}

.gst-chart-segment.cgst {
  background: #3b82f6;
}

.gst-chart-segment.sgst {
  background: #8b5cf6;
}

.gst-chart-segment.igst {
  background: #ec4899;
}

.gst-chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.78rem;
}

.gst-legend-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-secondary, #64748b);
}

[data-theme="dark"] .gst-legend-item {
  color: #94a3b8;
}

.gst-legend-color {
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

.gst-legend-color.taxable { background: #10b981; }
.gst-legend-color.cgst { background: #3b82f6; }
.gst-legend-color.sgst { background: #8b5cf6; }
.gst-legend-color.igst { background: #ec4899; }

/* Formula Card */
.gst-formula-card {
  background: var(--bg-secondary, #f8fafc);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: 0.75rem;
  padding: 1rem;
}

[data-theme="dark"] .gst-formula-card {
  background: #0f172a;
  border-color: #334155;
}

.gst-formula-title {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-secondary, #64748b);
  margin-bottom: 0.5rem;
  letter-spacing: 0.04em;
}

.gst-formula-math {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: #059669;
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

[data-theme="dark"] .gst-formula-math {
  color: #34d399;
}

.gst-formula-steps {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--text-secondary, #64748b);
}

[data-theme="dark"] .gst-formula-steps {
  color: #94a3b8;
}

.gst-formula-steps .step-line {
  margin-bottom: 0.25rem;
}

/* Result Action Buttons */
.gst-result-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

@media (max-width: 500px) {
  .gst-result-actions {
    grid-template-columns: 1fr;
  }
}

.gst-act-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 0.75rem;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 0.5rem;
  cursor: pointer;
  border: 1px solid var(--border-color, #cbd5e1);
  background: var(--bg-primary, #ffffff);
  color: var(--text-primary, #334155);
  transition: all 0.15s ease;
}

[data-theme="dark"] .gst-act-btn {
  background: #1e293b;
  border-color: #334155;
  color: #cbd5e1;
}

.gst-act-btn:hover {
  background: var(--bg-secondary, #f1f5f9);
  color: #10b981;
  border-color: #10b981;
}

[data-theme="dark"] .gst-act-btn:hover {
  background: #0f172a;
  color: #34d399;
  border-color: #34d399;
}

.gst-act-btn svg {
  width: 14px;
  height: 14px;
}

/* ==========================================================================
   5. HISTORY SECTION
   ========================================================================== */
.gst-history-section {
  margin-top: 1rem;
}

.gst-history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.gst-history-title-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.gst-history-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary, #0f172a);
}

[data-theme="dark"] .gst-history-title {
  color: #f8fafc;
}

.gst-count-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.15rem 0.55rem;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 9999px;
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
}

.gst-history-controls-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.gst-search-box {
  position: relative;
  flex: 1 1 240px;
}

.gst-search-box input {
  width: 100%;
  padding: 0.5rem 0.75rem 0.5rem 2.2rem;
  font-size: 0.85rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-color, #cbd5e1);
  background: var(--bg-primary, #ffffff);
  color: var(--text-primary, #0f172a);
}

[data-theme="dark"] .gst-search-box input {
  background: #0f172a;
  border-color: #334155;
  color: #f8fafc;
}

.gst-search-box svg {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  color: var(--text-secondary, #64748b);
  pointer-events: none;
}

.gst-history-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.gst-h-filter-pill {
  padding: 0.35rem 0.65rem;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 600;
  border: 1px solid var(--border-color, #cbd5e1);
  background: var(--bg-secondary, #f8fafc);
  color: var(--text-secondary, #64748b);
  cursor: pointer;
  transition: all 0.15s ease;
}

[data-theme="dark"] .gst-h-filter-pill {
  background: #0f172a;
  border-color: #334155;
  color: #94a3b8;
}

.gst-h-filter-pill:hover {
  color: var(--text-primary, #0f172a);
}

.gst-h-filter-pill.active {
  background: #10b981;
  border-color: #10b981;
  color: #ffffff;
}

.gst-history-actions-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* History List Items */
.gst-history-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.gst-history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.15rem;
  background: var(--card-bg, #ffffff);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: 0.75rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  gap: 1rem;
}

[data-theme="dark"] .gst-history-item {
  background: var(--card-bg, #1e293b);
  border-color: #334155;
}

.gst-history-item:hover {
  border-color: #10b981;
}

@media (max-width: 768px) {
  .gst-history-item {
    flex-direction: column;
    align-items: flex-start;
  }
  .gst-h-actions {
    width: 100%;
    justify-content: flex-end;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-color, #e2e8f0);
  }
}

.gst-h-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.gst-h-header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.gst-h-mode-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 0.35rem;
  text-transform: uppercase;
}

.gst-h-mode-badge.mode-add {
  background: rgba(16, 185, 129, 0.15);
  color: #059669;
}

[data-theme="dark"] .gst-h-mode-badge.mode-add {
  color: #34d399;
}

.gst-h-mode-badge.mode-remove {
  background: rgba(37, 99, 235, 0.15);
  color: #2563eb;
}

[data-theme="dark"] .gst-h-mode-badge.mode-remove {
  color: #60a5fa;
}

.gst-h-rate-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 0.35rem;
  background: rgba(245, 158, 11, 0.15);
  color: #d97706;
}

[data-theme="dark"] .gst-h-rate-badge {
  color: #fbbf24;
}

.gst-h-tx-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 0.35rem;
  background: var(--bg-secondary, #f1f5f9);
  color: var(--text-secondary, #64748b);
}

[data-theme="dark"] .gst-h-tx-badge {
  background: #0f172a;
  color: #94a3b8;
}

.gst-h-time {
  font-size: 0.74rem;
  color: var(--text-tertiary, #94a3b8);
  margin-left: auto;
}

.gst-h-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.15rem;
}

.gst-meta-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-primary, #334155);
}

[data-theme="dark"] .gst-meta-tag {
  color: #cbd5e1;
}

.gst-meta-tag svg {
  width: 12px;
  height: 12px;
  color: var(--text-secondary, #64748b);
}

.gst-h-numbers {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 0.25rem;
}

.gst-h-num-col {
  display: flex;
  flex-direction: column;
}

.gst-h-num-col .num-lbl {
  font-size: 0.72rem;
  color: var(--text-secondary, #64748b);
  margin-bottom: 0.1rem;
}

.gst-h-num-col .num-val {
  font-size: 0.95rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-primary, #0f172a);
}

[data-theme="dark"] .gst-h-num-col .num-val {
  color: #f8fafc;
}

.gst-h-num-col .num-val.highlight-gst {
  color: #dc2626;
}

[data-theme="dark"] .gst-h-num-col .num-val.highlight-gst {
  color: #f87171;
}

.gst-h-num-col .num-val.highlight-final {
  color: #059669;
}

[data-theme="dark"] .gst-h-num-col .num-val.highlight-final {
  color: #34d399;
}

.gst-h-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.gst-h-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.45rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 0.45rem;
  border: 1px solid var(--border-color, #cbd5e1);
  background: var(--bg-primary, #ffffff);
  color: var(--text-secondary, #64748b);
  cursor: pointer;
  transition: all 0.15s ease;
}

[data-theme="dark"] .gst-h-btn {
  background: #0f172a;
  border-color: #334155;
  color: #94a3b8;
}

.gst-h-btn svg {
  width: 13px;
  height: 13px;
}

.gst-h-btn.reuse-btn:hover {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
  border-color: #10b981;
}

.gst-h-btn.copy-btn:hover {
  background: rgba(37, 99, 235, 0.1);
  color: #2563eb;
  border-color: #2563eb;
}

.gst-h-btn.delete-btn:hover {
  background: rgba(220, 38, 38, 0.1);
  color: #dc2626;
  border-color: #dc2626;
}

/* Empty State */
.gst-empty-state {
  text-align: center;
  padding: 2.5rem 1.5rem;
  background: var(--card-bg, #ffffff);
  border: 1px dashed var(--border-color, #cbd5e1);
  border-radius: 0.75rem;
}

[data-theme="dark"] .gst-empty-state {
  background: var(--card-bg, #1e293b);
  border-color: #334155;
}

.empty-icon {
  width: 44px;
  height: 44px;
  color: var(--text-secondary, #94a3b8);
  margin-bottom: 0.75rem;
}

.empty-text {
  font-size: 0.9rem;
  color: var(--text-secondary, #64748b);
  max-width: 420px;
  margin: 0 auto;
}

/* ==========================================================================
   6. EDUCATIONAL / SEO GUIDE SECTION
   ========================================================================== */
.gst-guide-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color, #e2e8f0);
}

[data-theme="dark"] .gst-guide-section {
  border-top-color: #334155;
}

.gst-guide-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary, #0f172a);
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

[data-theme="dark"] .gst-guide-title {
  color: #f8fafc;
}

.gst-guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.gst-guide-card {
  background: var(--card-bg, #ffffff);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: 0.75rem;
  padding: 1.25rem;
}

[data-theme="dark"] .gst-guide-card {
  background: var(--card-bg, #1e293b);
  border-color: #334155;
}

.gst-guide-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary, #0f172a);
  margin-bottom: 0.65rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

[data-theme="dark"] .gst-guide-card h3 {
  color: #f8fafc;
}

.gst-guide-card p,
.gst-guide-card ul {
  font-size: 0.88rem;
  color: var(--text-secondary, #64748b);
  line-height: 1.55;
}

[data-theme="dark"] .gst-guide-card p,
[data-theme="dark"] .gst-guide-card ul {
  color: #94a3b8;
}

.gst-guide-card ul {
  padding-left: 1.2rem;
  margin-top: 0.5rem;
}

.gst-guide-card li {
  margin-bottom: 0.35rem;
}

/* FAQ Accordion / Cards */
.gst-faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.gst-faq-item {
  background: var(--card-bg, #ffffff);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: 0.75rem;
  padding: 1.15rem;
}

[data-theme="dark"] .gst-faq-item {
  background: var(--card-bg, #1e293b);
  border-color: #334155;
}

.gst-faq-q {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary, #0f172a);
  margin-bottom: 0.4rem;
}

[data-theme="dark"] .gst-faq-q {
  color: #f8fafc;
}

.gst-faq-a {
  font-size: 0.88rem;
  color: var(--text-secondary, #64748b);
  line-height: 1.55;
  margin: 0;
}

[data-theme="dark"] .gst-faq-a {
  color: #94a3b8;
}

/* ==========================================================================
   7. TOAST NOTIFICATION
   ========================================================================== */
.gst-toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: #1e293b;
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  border-radius: 0.55rem;
  font-size: 0.88rem;
  font-weight: 500;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
  z-index: 9999;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.gst-toast.show {
  opacity: 1;
  transform: translateY(0);
}

.gst-toast.success {
  background: #059669;
  color: #ffffff;
}

.gst-toast.info {
  background: #2563eb;
  color: #ffffff;
}

/* ==========================================================================
   8. PRINT STYLES
   ========================================================================== */
@media print {
  .site-header,
  .footer,
  .breadcrumb-nav-compact,
  .gst-header-section,
  .gst-input-card,
  .gst-history-section,
  .gst-guide-section,
  .gst-result-actions,
  .gst-toast {
    display: none !important;
  }

  body {
    background: #ffffff !important;
    color: #000000 !important;
  }

  .gst-stage-container {
    display: block !important;
  }

  .gst-result-card {
    border: 1px solid #000000 !important;
    box-shadow: none !important;
  }
}