/* ==========================================================================
   USWDS-Inspired Government Design System (Minimal, Accessible, Lightweight)
   ========================================================================== */

:root {
  /* Official U.S. Government-Style Palette */
  --gov-navy: #003366;          /* Primary Federal Blue */
  --gov-navy-dark: #002244;
  --gov-navy-light: #e7eff6;
  --gov-blue-accent: #005ea2;

  --gov-bg: #f8fafc;
  --gov-surface: #ffffff;
  --gov-border: #cbd5e1;
  --gov-border-dark: #64748b;

  --gov-text: #1b1b1b;
  --gov-text-muted: #565c65;
  --gov-text-inverse: #ffffff;

  --gov-success: #008837;
  --gov-danger: #d9381e;
  --gov-warning: #c05600;

  /* Data Visualizer Palette */
  --bar-takehome: #008837;
  --bar-fed: #005ea2;
  --bar-fica: #5c3596;

  /* Typography & Structure */
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius-sm: 4px;
  --radius-md: 6px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --transition: all 0.15s ease-in-out;
}

/* High-Contrast Accessible Dark Mode */
[data-theme="dark"] {
  --gov-navy: #60a5fa;
  --gov-navy-dark: #93c5fd;
  --gov-navy-light: #16263a;
  --gov-blue-accent: #93c5fd;

  --gov-bg: #0f172a;
  --gov-surface: #1e293b;
  --gov-border: #334155;
  --gov-border-dark: #94a3b8;

  --gov-text: #f8fafc;
  --gov-text-muted: #94a3b8;
  --gov-text-inverse: #0f172a;

  --gov-success: #34d399;
  --gov-danger: #f87171;
  --gov-warning: #fbbf24;

  --bar-takehome: #34d399;
  --bar-fed: #60a5fa;
  --bar-fica: #c084fc;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
}

/* Global Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  background-color: var(--gov-bg);
  color: var(--gov-text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.bold { font-weight: 700; }
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-tax { color: var(--gov-danger) !important; }
.text-success { color: var(--gov-success) !important; }
.text-takehome { color: var(--gov-success) !important; font-weight: 800; }
.hidden { display: none !important; }
.mt-2 { margin-top: 0.5rem; }

/* 1. Official Banner */
.usa-banner {
  background-color: #e2e8f0;
  border-bottom: 1px solid #cbd5e1;
  font-size: 0.775rem;
  color: #1e293b;
  padding: 0.35rem 0;
}
[data-theme="dark"] .usa-banner {
  background-color: #0b1329;
  border-bottom-color: #1e293b;
  color: #94a3b8;
}
.usa-banner-inner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.usa-banner-flag { font-size: 0.95rem; }

/* 2. Site Header */
.site-header {
  background-color: var(--gov-surface);
  border-bottom: 2px solid var(--gov-border);
  padding: 0.85rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--gov-text);
}
.brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: #003366;
  color: #ffffff;
  font-weight: 800;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}
[data-theme="dark"] .brand-badge {
  background-color: var(--gov-navy);
  color: #0f172a;
}
.brand-title {
  display: block;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.brand-title strong { color: var(--gov-navy); }
.brand-sub {
  display: block;
  font-size: 0.725rem;
  color: var(--gov-text-muted);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.badge-year {
  font-size: 0.75rem;
  font-weight: 700;
  background-color: var(--gov-navy-light);
  color: var(--gov-navy);
  border: 1px solid var(--gov-border);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}
.btn-theme-toggle {
  background: var(--gov-surface);
  border: 1px solid var(--gov-border);
  color: var(--gov-text);
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition);
}
.btn-theme-toggle:hover {
  background-color: var(--gov-bg);
}

/* 3. Hero Section */
.hero-section {
  background-color: var(--gov-surface);
  border-bottom: 1px solid var(--gov-border);
  padding: 2.25rem 0 1.75rem;
}
.hero-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--gov-navy);
  letter-spacing: -0.02em;
  margin-bottom: 0.35rem;
}
.hero-lead {
  font-size: 1.05rem;
  color: var(--gov-text-muted);
  max-width: 760px;
  margin-bottom: 1rem;
}
.hero-notice {
  display: inline-block;
  background-color: var(--gov-navy-light);
  border-left: 3px solid var(--gov-navy);
  padding: 0.45rem 0.8rem;
  font-size: 0.825rem;
  color: var(--gov-text);
}

/* 4. Advertisement Placeholders (Strict Aspect Ratios & Reserved Dimensions) */
.ad-wrapper-leaderboard {
  margin: 1.25rem auto 0;
}
.ad-box {
  background-color: var(--gov-surface);
  border: 1px dashed var(--gov-border);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}
.ad-caption {
  display: block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gov-text-muted);
  margin-bottom: 0.25rem;
}
.ad-fallback-msg {
  color: var(--gov-text-muted);
  font-size: 0.775rem;
  font-weight: 600;
}

/* Reserved Dimensions for CLS Prevention */
.ad-slot-leaderboard {
  width: 100%;
  max-width: 728px;
  height: 90px;
  margin: 0 auto;
}
.ad-slot-sidebar {
  width: 300px;
  height: 250px;
}
.ad-wrapper-mobile {
  margin: 1.5rem auto;
}
.ad-slot-mobile {
  width: 100%;
  max-width: 728px;
  min-height: 90px;
  margin: 0 auto;
  padding: 0.5rem;
}

/* 5. Main Calculator Grid */
.main-content {
  padding: 2rem 0 2.5rem;
}
.calc-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.9fr 300px;
  gap: 1.5rem;
  align-items: start;
}

.calc-form-card,
.calc-results-card {
  background-color: var(--gov-surface);
  border: 1px solid var(--gov-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}
.calc-results-card {
  border-top: 4px solid var(--gov-navy);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.75rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--gov-border);
}
.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gov-text);
}
.btn-link {
  background: none;
  border: none;
  color: var(--gov-blue-accent);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
}
.btn-link:hover { color: var(--gov-navy-dark); }
.live-tag {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--gov-success);
  text-transform: uppercase;
}
.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--gov-success);
  border-radius: 50%;
}

/* Form Styles */
.form-group { margin-bottom: 1.25rem; }
.fieldset-clean {
  border: none;
  padding: 0;
  margin: 0 0 1.25rem 0;
}
.field-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--gov-text);
  margin-bottom: 0.4rem;
}
.field-label-sm {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--gov-text);
  margin-bottom: 0.25rem;
}
.field-hint {
  display: block;
  font-size: 0.775rem;
  color: var(--gov-text-muted);
  margin-top: 0.3rem;
}
.field-error {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--gov-danger);
  margin-top: 0.35rem;
}

.form-control {
  width: 100%;
  height: 42px;
  padding: 0 0.75rem;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--gov-text);
  background-color: var(--gov-surface);
  border: 1px solid var(--gov-border-dark);
  border-radius: var(--radius-sm);
  outline: none;
  transition: var(--transition);
}
.form-control:focus {
  border-color: var(--gov-navy);
  box-shadow: 0 0 0 2px var(--gov-navy-light);
}

.input-symbol-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.symbol-prefix {
  position: absolute;
  left: 0.85rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gov-text-muted);
  pointer-events: none;
}
.input-currency {
  padding-left: 1.85rem;
  font-weight: 700;
  font-size: 1.15rem;
}

.form-row {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.col-half { flex: 1; }

/* Filing Status Cards */
.radio-cards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
}
.radio-card {
  position: relative;
  border: 1px solid var(--gov-border);
  background-color: var(--gov-surface);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}
.radio-card input {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
}
.radio-card.active {
  border-color: var(--gov-navy);
  background-color: var(--gov-navy-light);
}
.card-title-text {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--gov-text);
  padding-right: 1.5rem;
}
.card-sub-text {
  font-size: 0.725rem;
  color: var(--gov-text-muted);
  margin-top: 0.2rem;
}

/* Deductions Segmented Switch */
.segmented-control {
  display: flex;
  border: 1px solid var(--gov-border-dark);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 0.75rem;
}
.segment-option {
  flex: 1;
  position: relative;
  text-align: center;
  cursor: pointer;
}
.segment-option input {
  position: absolute;
  opacity: 0;
}
.segment-pill {
  display: block;
  padding: 0.55rem;
  font-size: 0.85rem;
  font-weight: 700;
  background-color: var(--gov-surface);
  color: var(--gov-text);
  transition: var(--transition);
}
.segment-option input:checked + .segment-pill {
  background-color: #003366;
  color: #ffffff;
}
[data-theme="dark"] .segment-option input:checked + .segment-pill {
  background-color: var(--gov-navy);
  color: #0f172a;
}

.callout-box {
  background-color: var(--gov-navy-light);
  border-left: 4px solid var(--gov-navy);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}
.callout-val {
  display: block;
  font-size: 1.35rem;
  color: var(--gov-navy);
  margin: 0.15rem 0;
}
.callout-note {
  font-size: 0.75rem;
  color: var(--gov-text-muted);
}

.itemized-inputs-panel {
  background-color: var(--gov-bg);
  border: 1px solid var(--gov-border);
  padding: 0.85rem;
  border-radius: var(--radius-sm);
}
.itemized-total-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px dashed var(--gov-border);
}

/* Accordions */
.accordion-section {
  border: 1px solid var(--gov-border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  background-color: var(--gov-surface);
}
.accordion-summary {
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--gov-bg);
}
.accordion-summary::-webkit-details-marker { display: none; }
.accordion-icon {
  font-size: 0.75rem;
  transition: transform 0.2s ease;
}
.accordion-section[open] .accordion-icon {
  transform: rotate(180deg);
}
.accordion-content { padding: 1rem; }

/* 6. Results Section Styles */
.primary-metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.metric-block {
  border: 1px solid var(--gov-border);
  background-color: var(--gov-bg);
  padding: 0.85rem;
  border-radius: var(--radius-sm);
}
.metric-caption {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--gov-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.2rem;
}
.metric-figure {
  font-size: 1.7rem;
  font-weight: 800;
  line-height: 1.2;
}
.figure-tax { color: var(--gov-danger); }
.figure-takehome { color: var(--gov-success); }

.rates-banner {
  display: flex;
  align-items: center;
  justify-content: space-around;
  background-color: var(--gov-surface);
  border: 1px solid var(--gov-border);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.25rem;
}
.rate-col { text-align: center; }
.rate-sub {
  display: block;
  font-size: 0.75rem;
  color: var(--gov-text-muted);
  font-weight: 600;
}
.rate-data {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--gov-text);
}
.rate-footnote {
  display: block;
  font-size: 0.7rem;
  color: var(--gov-text-muted);
}
.rate-divider {
  width: 1px;
  height: 36px;
  background-color: var(--gov-border);
}

/* Pay Periods Switcher */
.period-box {
  background-color: var(--gov-bg);
  border: 1px solid var(--gov-border);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  margin-bottom: 1.25rem;
}
.period-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--gov-text);
  margin-bottom: 0.6rem;
}
.period-tabs {
  display: flex;
  background-color: var(--gov-surface);
  border: 1px solid var(--gov-border);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
}
.period-tab-btn {
  flex: 1;
  padding: 0.4rem 0.2rem;
  font-size: 0.75rem;
  font-weight: 700;
  background: none;
  border: none;
  color: var(--gov-text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.period-tab-btn.active {
  background-color: #003366;
  color: #ffffff;
}
[data-theme="dark"] .period-tab-btn.active {
  background-color: var(--gov-navy);
  color: #0f172a;
}
.period-display {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-top: 0.6rem;
}
.period-amount {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--gov-success);
}
.period-desc {
  font-size: 0.8rem;
  color: var(--gov-text-muted);
}

/* Ratio Bar Visualizer */
.tax-ratio-container {
  margin-bottom: 1.25rem;
}
.ratio-track {
  display: flex;
  height: 12px;
  background-color: var(--gov-border);
  border-radius: 2px;
  overflow: hidden;
}
.ratio-slice {
  height: 100%;
  transition: width 0.2s ease-out;
}
.slice-takehome { background-color: var(--bar-takehome); }
.slice-fed { background-color: var(--bar-fed); }
.slice-fica { background-color: var(--bar-fica); }

.ratio-legend {
  display: flex;
  justify-content: space-between;
  font-size: 0.725rem;
  color: var(--gov-text-muted);
  margin-top: 0.4rem;
}
.legend-box {
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 0.25rem;
  border-radius: 1px;
}

/* Tables */
.data-breakdown-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}
.data-breakdown-table th,
.data-breakdown-table td {
  padding: 0.45rem 0.5rem;
  border-bottom: 1px solid var(--gov-border);
}
.data-breakdown-table th {
  text-align: left;
  font-weight: 600;
  color: var(--gov-text);
}
.table-subtotal-row {
  background-color: var(--gov-bg);
}
.table-total-row {
  border-top: 2px solid var(--gov-border-dark);
  font-size: 0.95rem;
}
.bracket-table th {
  background-color: var(--gov-bg);
  font-size: 0.775rem;
  text-transform: uppercase;
}
.bracket-active {
  background-color: var(--gov-navy-light);
  font-weight: 700;
}

.tax-disclaimer {
  font-size: 0.75rem;
  color: var(--gov-text-muted);
  background-color: var(--gov-bg);
  border: 1px solid var(--gov-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  margin-top: 1rem;
  line-height: 1.45;
}

/* 7. Progressive Bracket Detail Section */
.progressive-bracket-section {
  padding: 0 0 2rem;
}
.section-intro {
  font-size: 0.9rem;
  color: var(--gov-text-muted);
  line-height: 1.6;
  margin-bottom: 1rem;
}

/* 8. Educational Content Section */
.educational-section {
  background-color: var(--gov-surface);
  border-top: 1px solid var(--gov-border);
  padding: 3.5rem 0;
}
.section-title {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--gov-navy);
  margin-bottom: 0.5rem;
}
.section-lead {
  font-size: 1.05rem;
  color: var(--gov-text-muted);
  margin-bottom: 2rem;
}
.guide-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.guide-card {
  border: 1px solid var(--gov-border);
  background-color: var(--gov-bg);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
}
.guide-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gov-text);
  margin-bottom: 0.4rem;
}
.guide-card p {
  font-size: 0.9rem;
  color: var(--gov-text-muted);
  line-height: 1.6;
}

/* 9. FAQ Section */
.faq-section { padding: 3.5rem 0; }
.faq-accordion-group {
  max-width: 820px;
  margin: 1.5rem auto 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.faq-item {
  border: 1px solid var(--gov-border);
  background-color: var(--gov-surface);
  border-radius: var(--radius-sm);
}
.faq-question {
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.85rem 1rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--gov-text-muted);
}
.faq-item[open] .faq-question::after { content: "−"; }
.faq-answer {
  padding: 0 1rem 1rem;
  font-size: 0.875rem;
  color: var(--gov-text-muted);
  line-height: 1.6;
}

/* 10. Footer */
.site-footer {
  background-color: var(--gov-surface);
  border-top: 2px solid var(--gov-border);
  padding: 2.5rem 0 2rem;
  font-size: 0.8rem;
  color: var(--gov-text-muted);
}
.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.footer-bottom {
  grid-column: 1 / -1;
  border-top: 1px solid var(--gov-border);
  padding-top: 1.25rem;
  margin-top: 0.5rem;
}

/* 11. Responsive Layout */
@media screen and (max-width: 1024px) {
  .calc-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }
  .sidebar-ad-col {
    display: none; /* Hide 300x250 skyscraper on medium screens to keep form clean */
  }
}

@media screen and (max-width: 800px) {
  .calc-grid { grid-template-columns: 1fr; }
  .guide-cards-grid { grid-template-columns: 1fr; }
  .footer-content { grid-template-columns: 1fr; }
  .ad-slot-leaderboard {
    height: auto;
    min-height: 50px;
  }
}

@media screen and (max-width: 600px) {
  .radio-cards-grid { grid-template-columns: 1fr; }
  .primary-metrics-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.8rem; }
  .form-row {
    flex-direction: column;
    gap: 0.5rem;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }
}