/* ═══════════════════════════════════════════════════════════════
   US Salary Calculator — Global Styles
   Design: dark glassmorphism, Inter font, mobile-first responsive
   ═══════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ── Design Tokens ──────────────────────────────────────────── */
:root {
  /* Colors */
  --color-bg:            #0a0e1a;
  --color-bg-secondary:  #0f1629;
  --color-surface:       rgba(255, 255, 255, 0.04);
  --color-surface-hover: rgba(255, 255, 255, 0.07);
  --color-border:        rgba(255, 255, 255, 0.08);
  --color-border-focus:  rgba(99, 179, 237, 0.5);

  /* Accent gradient */
  --color-accent-1:      #63b3ed;  /* sky blue */
  --color-accent-2:      #9f7aea;  /* violet */
  --color-accent-3:      #68d391;  /* emerald */
  --color-accent-danger: #fc8181;
  --color-accent-warn:   #f6ad55;

  --gradient-primary:    linear-gradient(135deg, #63b3ed 0%, #9f7aea 100%);
  --gradient-success:    linear-gradient(135deg, #68d391 0%, #4fd1c5 100%);
  --gradient-warm:       linear-gradient(135deg, #f6ad55 0%, #fc8181 100%);

  /* Text */
  --color-text-primary:   #f0f4f8;
  --color-text-secondary: #a0aec0;
  --color-text-muted:     #718096;

  /* Spacing */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Shadow */
  --shadow-card:   0 4px 24px rgba(0, 0, 0, 0.4), 0 1px 4px rgba(0, 0, 0, 0.2);
  --shadow-glow:   0 0 32px rgba(99, 179, 237, 0.15);
  --shadow-input:  0 0 0 3px rgba(99, 179, 237, 0.2);

  /* Transitions */
  --transition-fast:   0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow:   0.4s ease;

  /* Font */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Layout */
  --max-width: 1100px;
  --sidebar-width: 380px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  background-image:
    radial-gradient(ellipse 80% 50% at 20% 10%, rgba(99, 179, 237, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(159, 122, 234, 0.05) 0%, transparent 60%);
}

/* ── Typography ─────────────────────────────────────────────── */
h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; }

h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); letter-spacing: -0.02em; }
h3 { font-size: 1.1rem; }

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Layout ─────────────────────────────────────────────────── */
.app-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md);
}

/* ── Header ─────────────────────────────────────────────────── */
.site-header {
  text-align: center;
  padding: var(--space-2xl) var(--space-md) var(--space-xl);
}

.site-header .badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background: rgba(99, 179, 237, 0.1);
  border: 1px solid rgba(99, 179, 237, 0.25);
  border-radius: 100px;
  padding: var(--space-xs) var(--space-md);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent-1);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-lg);
}

.site-header p {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin-top: var(--space-sm);
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

/* ── AdSense Banner ─────────────────────────────────────────── */
.ad-banner {
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-xl);
  overflow: hidden;
}

/* ── Main Grid ──────────────────────────────────────────────── */
.main-grid {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: var(--space-xl);
  align-items: start;
}

@media (max-width: 768px) {
  .main-grid { grid-template-columns: 1fr; }
}

/* ── Card (Glass) ───────────────────────────────────────────── */
.card {
  background: var(--color-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-normal);
}

.card:hover { box-shadow: var(--shadow-card), var(--shadow-glow); }

.card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.card-header .card-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.card-icon.blue  { background: rgba(99, 179, 237, 0.15); }
.card-icon.violet { background: rgba(159, 122, 234, 0.15); }
.card-icon.green { background: rgba(104, 211, 145, 0.15); }

.card-header h2 { font-size: 1rem; font-weight: 600; }

/* ── Form Elements ──────────────────────────────────────────── */
.form-section {
  margin-bottom: var(--space-xl);
}

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

.form-section-title {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.form-group {
  margin-bottom: var(--space-md);
}

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

label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.input-wrapper {
  position: relative;
}

.input-prefix {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  pointer-events: none;
}

input[type="number"],
input[type="text"],
select {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}

input.has-prefix { padding-left: 28px; }

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
  outline: none;
  border-color: var(--color-accent-1);
  box-shadow: var(--shadow-input);
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23a0aec0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* Row layout for small groups */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

/* Checkbox */
.checkbox-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
}

.checkbox-group input[type="checkbox"] {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  accent-color: var(--color-accent-1);
  cursor: pointer;
  flex-shrink: 0;
}

.checkbox-group label {
  margin: 0;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--color-text-primary);
}

/* ── Calculate Button ───────────────────────────────────────── */
.btn-calculate {
  width: 100%;
  padding: var(--space-md) var(--space-xl);
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-md);
  color: #fff;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: opacity var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  margin-top: var(--space-lg);
  position: relative;
  overflow: hidden;
}

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

.btn-calculate:hover::before { opacity: 1; }
.btn-calculate:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(99, 179, 237, 0.35); }
.btn-calculate:active { transform: translateY(0); }

/* ── Results Column ─────────────────────────────────────────── */
.results-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* ── Empty State ────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl);
  color: var(--color-text-muted);
}

.empty-state .empty-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  opacity: 0.4;
}

.empty-state p { font-size: 0.95rem; }

/* ── Net Pay Hero ───────────────────────────────────────────── */
.net-pay-hero {
  background: linear-gradient(135deg, rgba(99,179,237,0.12) 0%, rgba(159,122,234,0.12) 100%);
  border: 1px solid rgba(99, 179, 237, 0.2);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.net-pay-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse 40% 40% at 50% 50%, rgba(99, 179, 237, 0.08), transparent);
  animation: pulse-bg 4s ease-in-out infinite;
}

@keyframes pulse-bg {
  0%, 100% { opacity: 0.5; }
  50%       { opacity: 1; }
}

.net-pay-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  position: relative;
}

.net-pay-amount {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  line-height: 1.1;
}

.net-pay-sub {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
  position: relative;
}

.net-pay-sub strong { color: var(--color-text-primary); }

/* ── Tax Flow Bar ───────────────────────────────────────────── */
.tax-flow {
  margin-top: var(--space-xl);
  position: relative;
}

.tax-flow-bar {
  height: 10px;
  border-radius: 100px;
  background: var(--color-border);
  overflow: hidden;
  display: flex;
}

.tax-flow-segment {
  height: 100%;
  transition: width var(--transition-slow);
  position: relative;
}

.tax-flow-segment.federal  { background: #fc8181; }
.tax-flow-segment.state    { background: #f6ad55; }
.tax-flow-segment.fica     { background: #9f7aea; }
.tax-flow-segment.take-home { background: var(--gradient-primary); background: linear-gradient(90deg, #63b3ed, #68d391); }

.tax-flow-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  margin-top: var(--space-md);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.legend-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 4px;
  vertical-align: middle;
}

.legend-dot.federal  { background: #fc8181; }
.legend-dot.state    { background: #f6ad55; }
.legend-dot.fica     { background: #9f7aea; }
.legend-dot.take-home { background: #63b3ed; }

/* ── Tax Breakdown Table ────────────────────────────────────── */
.breakdown-table {
  width: 100%;
  border-collapse: collapse;
}

.breakdown-table tr {
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-fast);
}

.breakdown-table tr:last-child { border-bottom: none; }
.breakdown-table tr:hover { background: var(--color-surface-hover); }

.breakdown-table td {
  padding: var(--space-sm) var(--space-xs);
  font-size: 0.875rem;
}

.breakdown-table .row-label {
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.breakdown-table .row-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.breakdown-table .row-amount {
  text-align: right;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--color-text-primary);
}

.breakdown-table .row-rate {
  text-align: right;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  width: 60px;
}

.breakdown-table .row-total td {
  font-weight: 700;
  color: var(--color-text-primary);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
}

.breakdown-table .row-net td {
  color: var(--color-accent-1);
  font-weight: 700;
  font-size: 1rem;
}

/* ── Pay Schedule Table ─────────────────────────────────────── */
.pay-schedule-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

@media (max-width: 500px) {
  .pay-schedule-grid { grid-template-columns: 1fr; }
}

.pay-schedule-card {
  background: var(--color-surface-hover);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.pay-schedule-card:hover {
  transform: translateY(-2px);
  border-color: rgba(99, 179, 237, 0.3);
}

.pay-schedule-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.pay-schedule-gross {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-secondary);
  font-variant-numeric: tabular-nums;
}

.pay-schedule-net {
  font-size: 1.35rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-variant-numeric: tabular-nums;
}

.pay-schedule-divider {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  margin: 2px 0;
}

/* ── Percentile Widget ──────────────────────────────────────── */
.percentile-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

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

.percentile-card {
  background: var(--color-surface-hover);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
  transition: transform var(--transition-fast);
}

.percentile-card:hover { transform: translateY(-2px); }

.percentile-emoji { font-size: 1.8rem; margin-bottom: var(--space-xs); }
.percentile-value {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.percentile-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent-1);
  margin-top: 2px;
}
.percentile-scope {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.fun-fact {
  background: rgba(99, 179, 237, 0.06);
  border-left: 3px solid var(--color-accent-1);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--space-sm) var(--space-md);
  margin-top: var(--space-md);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  font-style: italic;
}

/* ── Validation message ─────────────────────────────────────── */
.field-warning {
  font-size: 0.75rem;
  color: var(--color-accent-warn);
  margin-top: var(--space-xs);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ── Ad inline slot ─────────────────────────────────────────── */
.ad-inline {
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* ── Footer ─────────────────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: var(--space-2xl) var(--space-md);
  color: var(--color-text-muted);
  font-size: 0.8rem;
  line-height: 1.8;
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-2xl);
}

.site-footer a {
  color: var(--color-accent-1);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}
.site-footer a:hover { opacity: 0.75; }

/* ── Animations ─────────────────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.animate-in {
  animation: fadeInUp 0.35s var(--transition-normal) both;
}

.results-column .card:nth-child(1) { animation-delay: 0s; }
.results-column .card:nth-child(2) { animation-delay: 0.05s; }
.results-column .card:nth-child(3) { animation-delay: 0.1s; }
.results-column .card:nth-child(4) { animation-delay: 0.15s; }

/* ── Scrollbar ──────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-text-muted); }

/* ── Focus Visible ──────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-accent-1);
  outline-offset: 2px;
  border-radius: 4px;
}