/* ==========================================================================
   RESET & FOUNDATIONS
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --font-sans:
    "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  --font-mono:
    ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;

  /* Sleek Pro Dark Palette */
  --bg-primary: #0f172a; /* Deep slate canvas background */
  --bg-card: #1e293b; /* Elevated slate for data panels */
  --bg-input: #0b0f19; /* Recessed contrast wells for input fields */
  --text-main: #f8fafc; /* High-contrast crisp off-white text */
  --text-muted: #94a3b8; /* Subtle low-priority metadata text */
  --border-color: #334155; /* Structural border lines */

  /* Status Accents */
  --color-primary: #3b82f6; /* Vivid engineering blue */
  --color-primary-hover: #2563eb;
  --color-teal: #0d9488; /* YTD Metrics highlight accent */
  --color-success: #10b981; /* Valid / Verified state */
  --color-warning: #f59e0b; /* Overdue indicators */
  --color-danger: #ef4444; /* Critical compliance validation errors */

  /* Modern Fluid Spacing System */
  --space-xs: clamp(0.5rem, 1vw, 0.75rem);
  --space-md: clamp(1rem, 2.5vw, 1.5rem);
  --space-lg: clamp(1.5rem, 4vw, 2.5rem);
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  padding: var(--space-md);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Base Elm Container Constraint */
#elm-app {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
}

/* ==========================================================================
   MACRO RESPONSIVE LAYOUTS
   ========================================================================== */
/* Adaptive Dashboard Flex-Grid Metrics & Inputs */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(
    auto-fit,
    minmax(clamp(250px, 100%, 280px), 1fr)
  );
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

/* Midsection Split (Tax Logic Engine vs Verification Module) */
.middle-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

@media (min-width: 53.125rem) {
  /* 850px breakpoint */
  .middle-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

/* ==========================================================================
   COMPONENTS & CARDS
   ========================================================================== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow:
    0 4px 6px -1px rgba(0, 0, 0, 0.2),
    0 2px 4px -2px rgba(0, 0, 0, 0.2);
}

.card-default {
  border-top: 4px solid var(--text-muted);
}
.card-teal {
  border-top: 4px solid var(--color-teal);
}

h2 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

h3 {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.big-value {
  font-size: clamp(1.5rem, 4vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-main);
  word-break: break-all;
}

/* ==========================================================================
   TAX LOGIC ENGINE VISUALS
   ========================================================================== */
.chart-card,
.logic-engine {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--space-md);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
}

.calc-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.95rem;
  gap: 1rem;
}

.calc-row b {
  font-family: var(--font-mono);
  color: var(--text-main);
}

.final-payable {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  padding: 1rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-weight: 600;
  gap: 1rem;
  flex-wrap: wrap;
}

.final-payable b {
  font-size: 1.2rem;
  font-family: var(--font-mono);
  color: var(--color-primary);
}

/* ==========================================================================
   FORMS & INPUT INTERFACES
   ========================================================================== */
.flex {
  display: flex;
}
.flex-col {
  display: flex;
  flex-direction: column;
}
.gap-1 {
  gap: 0.25rem;
}
.gap-2 {
  gap: 0.5rem;
}
.mt-1 {
  margin-top: 0.25rem;
}
.mt-2 {
  margin-top: 0.5rem;
}
.mt-3 {
  margin-top: 0.75rem;
}
.ml-3 {
  margin-left: 0.75rem;
}

.input,
select {
  width: 100%;
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--bg-input);
  color: var(--text-main);
}

.input:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

/* Ensure clean appearance for select dropdowns in dark theme overrides */
select option {
  background-color: var(--bg-card);
  color: var(--text-main);
}

.validation-error {
  color: var(--color-danger);
  font-size: 0.75rem;
  margin-top: 0.25rem;
  font-weight: 500;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.625rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  transition:
    background-color 0.1s ease,
    border-color 0.1s ease;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
}
.btn-primary:hover {
  background-color: var(--color-primary-hover);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--border-color);
  color: var(--text-main);
}
.btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: var(--text-muted);
}

/* Dynamic wrapping configuration for action matrices */
.flex.gap-2 {
  display: flex;
  flex-wrap: wrap;
}
.flex.gap-2 .btn {
  flex: 1 1 110px;
}

/* ==========================================================================
   TOUCH-SAFE DATA TABLES
   ========================================================================== */
.table-card {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-top: 0.5rem;
  background-color: var(--bg-card);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
  min-width: 420px;
}

th,
td {
  padding: 0.625rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

th {
  background-color: var(--bg-input);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

tr.row-locked {
  background-color: rgba(15, 23, 42, 0.4);
}

/* ==========================================================================
   CSV FIELD MAPPER ENGINE CUSTOM STYLES
   ========================================================================== */
.mapper-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--space-md);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
}

.mapper-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.mapper-grid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.mapper-row {
  display: grid;
  grid-template-columns: 1fr auto 1.2fr auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

@media (max-width: 36rem) {
  /* Mobile Collapse Threshold for Mapper Row Matrix */
  .mapper-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
  .mapper-arrow {
    display: none;
  }
}

.mapper-source {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  word-break: break-all;
  color: var(--text-main);
}

.mapper-arrow {
  color: var(--text-muted);
}

.mapper-confidence {
  font-weight: bold;
  font-size: 1.1rem;
  padding: 0 0.25rem;
}
.conf-high {
  color: var(--color-success);
}
.conf-low {
  color: var(--text-muted);
}

.mapper-footer {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ==========================================================================
   ALERTS, UTILITIES & HELPERS
   ========================================================================== */
.alert {
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: flex-start;
  font-size: 0.9rem;
  font-weight: 500;
}

@media (min-width: 40rem) {
  .alert {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .alert .btn {
    flex: 0 0 auto;
  }
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34d399;
}
.alert-danger {
  background-color: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #f87171;
}
.alert-warning {
  background-color: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: #fbbf24;
}
.alert-info {
  background-color: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: #60a5fa;
}

.font-mono {
  font-family: var(--font-mono);
}
.text-sm {
  font-size: 0.8rem;
}
.text-xs {
  font-size: 0.75rem;
}
.text-green {
  color: var(--color-success);
}
.text-danger {
  color: var(--color-danger);
}
.text-secondary {
  color: var(--text-muted);
}
.font-semibold {
  font-weight: 600;
}