/* ContractorCalc.uk - Professional Styles */

/* ============================================
   CSS Variables - Design System
   ============================================ */
:root {
  /* Colors - Professional, Trustworthy */
  --color-primary: #1a56db;
  --color-primary-dark: #1e40af;
  --color-primary-light: #3b82f6;
  --color-secondary: #059669;
  --color-secondary-light: #10b981;
  
  /* Neutrals */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  /* Semantic */
  --color-success: #059669;
  --color-warning: #d97706;
  --color-danger: #dc2626;
  --color-info: #0284c7;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-gray-800);
  background: var(--color-gray-50);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Layout
   ============================================ */
.container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ============================================
   Header
   ============================================ */
.site-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  padding: var(--space-md) 0;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-gray-900);
  text-decoration: none;
}

.logo-icon {
  font-size: 1.5rem;
}

.logo-suffix {
  color: var(--color-primary);
}

.tagline {
  font-size: 0.875rem;
  color: var(--color-gray-500);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: var(--space-3xl) 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: var(--space-md);
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.125rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto var(--space-lg);
}

.tax-year-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  padding: var(--space-xs) var(--space-md);
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 600;
}

/* ============================================
   Calculator Section
   ============================================ */
.calculator-section {
  padding: var(--space-2xl) 0;
  margin-top: calc(-1 * var(--space-xl));
}

.calculator-card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--space-xl);
}

.calculator-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* Form Groups */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-group label {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.label-text {
  font-weight: 600;
  color: var(--color-gray-800);
  font-size: 0.9375rem;
}

.label-help {
  font-size: 0.8125rem;
  color: var(--color-gray-500);
}

/* Inputs */
input[type="number"],
input[type="text"] {
  width: 100%;
  padding: var(--space-md);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-gray-800);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="number"]:focus,
input[type="text"]:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
}

.input-with-prefix,
.input-with-suffix {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix,
.input-suffix {
  position: absolute;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-gray-500);
  pointer-events: none;
}

.input-prefix {
  left: var(--space-md);
}

.input-suffix {
  right: var(--space-md);
}

.input-with-prefix input {
  padding-left: calc(var(--space-md) + 1.25rem);
}

.input-with-suffix input {
  padding-right: calc(var(--space-md) + 1.5rem);
}

/* Quick Amount Buttons */
.quick-amounts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-xs);
}

.quick-btn {
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--color-gray-300);
  border-radius: 100px;
  background: var(--color-white);
  color: var(--color-gray-600);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(26, 86, 219, 0.05);
}

/* Toggle Options (IR35) */
.toggle-group {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.toggle-option {
  position: relative;
  cursor: pointer;
}

.toggle-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.toggle-label {
  display: flex;
  flex-direction: column;
  padding: var(--space-md);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.toggle-option input:checked + .toggle-label {
  border-color: var(--color-primary);
  background: rgba(26, 86, 219, 0.05);
}

.toggle-option input:focus + .toggle-label {
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
}

.toggle-title {
  font-weight: 600;
  color: var(--color-gray-800);
}

.toggle-desc {
  font-size: 0.8125rem;
  color: var(--color-gray-500);
}

/* Calculate Button */
.calculate-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-lg);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1.125rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.calculate-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.calculate-btn:active {
  transform: translateY(0);
}

.btn-arrow {
  width: 20px;
  height: 20px;
}

/* ============================================
   Results Section
   ============================================ */
.results-section {
  margin-top: var(--space-xl);
}

.results-section.hidden {
  display: none;
}

.results-card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}

.result-header {
  background: linear-gradient(135deg, var(--color-secondary) 0%, #047857 100%);
  color: var(--color-white);
  padding: var(--space-lg);
  text-align: center;
}

.result-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.result-scenario {
  opacity: 0.9;
  font-size: 0.875rem;
}

.result-main {
  padding: var(--space-xl);
  text-align: center;
  background: var(--color-gray-50);
}

.day-rate-display {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.day-rate-display .currency {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-gray-600);
}

.day-rate-display .amount {
  font-size: 4rem;
  font-weight: 800;
  color: var(--color-secondary);
  line-height: 1;
}

.day-rate-display .period {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-gray-500);
}

.rate-note {
  color: var(--color-gray-600);
  font-size: 0.9375rem;
}

/* Breakdown Table */
.result-breakdown {
  padding: var(--space-lg);
  border-top: 1px solid var(--color-gray-200);
}

.result-breakdown h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-gray-700);
}

.breakdown-table {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.breakdown-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) 0;
}

.breakdown-row.deduction {
  color: var(--color-gray-600);
  font-size: 0.9375rem;
}

.breakdown-row.subtotal {
  border-top: 1px dashed var(--color-gray-300);
  padding-top: var(--space-md);
  margin-top: var(--space-sm);
}

.breakdown-row.total {
  border-top: 2px solid var(--color-gray-800);
  padding-top: var(--space-md);
  margin-top: var(--space-sm);
  font-weight: 700;
  font-size: 1.125rem;
}

.breakdown-label {
  color: var(--color-gray-700);
}

.breakdown-value {
  font-weight: 600;
  font-family: var(--font-mono);
}

.breakdown-value.negative {
  color: var(--color-danger);
}

.breakdown-row.total .breakdown-value {
  color: var(--color-secondary);
}

/* Tax Bands Detail */
.tax-bands {
  padding: var(--space-lg);
  border-top: 1px solid var(--color-gray-200);
  background: var(--color-gray-50);
}

.tax-bands h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-gray-700);
}

.tax-bands-detail {
  font-size: 0.875rem;
  color: var(--color-gray-600);
}

.tax-band-item {
  display: flex;
  justify-content: space-between;
  padding: var(--space-xs) 0;
}

/* Comparison Section */
.comparison-section {
  padding: var(--space-lg);
  border-top: 1px solid var(--color-gray-200);
}

.comparison-section h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-gray-700);
}

.comparison-card {
  background: var(--color-gray-50);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.comparison-item {
  display: flex;
  justify-content: space-between;
  padding: var(--space-sm) 0;
}

.comparison-item.highlight {
  font-weight: 600;
  color: var(--color-secondary);
}

.comparison-value {
  font-family: var(--font-mono);
  font-weight: 600;
}

.comparison-note {
  margin-top: var(--space-md);
  font-size: 0.8125rem;
  color: var(--color-gray-500);
}

/* CTA Section */
.cta-section {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--space-xl);
  margin-top: var(--space-xl);
  text-align: center;
}

.cta-section h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.cta-section > p {
  color: var(--color-gray-600);
  margin-bottom: var(--space-lg);
}

.cta-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.cta-btn {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.cta-btn.umbrella {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
}

.cta-btn.accountant {
  background: var(--color-white);
  border: 2px solid var(--color-gray-200);
  color: var(--color-gray-800);
}

.cta-btn.primary {
  background: linear-gradient(135deg, var(--color-secondary) 0%, #047857 100%);
  color: var(--color-white);
}

.cta-btn.secondary {
  background: var(--color-white);
  border: 2px solid var(--color-gray-200);
  color: var(--color-gray-800);
}

.cta-icon {
  font-size: 1.5rem;
}

.cta-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
}

.cta-title {
  font-weight: 600;
}

.cta-desc {
  font-size: 0.8125rem;
  opacity: 0.8;
}

.affiliate-disclosure {
  margin-top: var(--space-lg);
  font-size: 0.75rem;
  color: var(--color-gray-400);
  text-align: center;
}

/* Recalculate Button */
.recalculate-btn {
  display: block;
  width: 100%;
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background: var(--color-white);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  color: var(--color-gray-600);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.recalculate-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ============================================
   Info Section
   ============================================ */
.info-section {
  padding: var(--space-3xl) 0;
  background: var(--color-white);
}

.info-section h2 {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xl);
}

.info-grid {
  display: grid;
  gap: var(--space-lg);
}

.info-card {
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.info-icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.info-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.info-card p {
  color: var(--color-gray-600);
  margin-bottom: var(--space-md);
}

.info-card ul {
  list-style: none;
  padding: 0;
}

.info-card li {
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-xs);
  color: var(--color-gray-700);
  font-size: 0.9375rem;
}

.info-card li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-secondary);
  font-weight: 700;
}

/* ============================================
   Rates Section
   ============================================ */
.rates-section {
  padding: var(--space-2xl) 0;
  background: var(--color-gray-50);
}

.rates-section h2 {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xl);
}

.rates-grid {
  display: grid;
  gap: var(--space-lg);
}

.rates-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.rates-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-gray-700);
}

.rates-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.rates-table tr {
  border-bottom: 1px solid var(--color-gray-100);
}

.rates-table tr:last-child {
  border-bottom: none;
}

.rates-table td {
  padding: var(--space-sm) var(--space-xs);
}

.rates-table td:first-child {
  color: var(--color-gray-600);
}

.rates-table td:nth-child(2) {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.rates-table td:last-child {
  text-align: right;
  font-weight: 600;
  color: var(--color-primary);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--color-gray-800);
  color: var(--color-gray-300);
  padding: var(--space-2xl) 0;
}

.footer-content {
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-lg);
}

.footer-disclaimer {
  font-size: 0.8125rem;
  line-height: 1.7;
  max-width: 600px;
  margin: 0 auto var(--space-lg);
  color: var(--color-gray-400);
}

.footer-copyright {
  font-size: 0.8125rem;
  color: var(--color-gray-500);
}

/* ============================================
   Responsive
   ============================================ */
@media (min-width: 640px) {
  .hero h1 {
    font-size: 2.75rem;
  }
  
  .calculator-card {
    padding: var(--space-2xl);
  }
  
  .cta-buttons {
    flex-direction: row;
  }
  
  .cta-btn {
    flex: 1;
  }
  
  .info-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .rates-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .day-rate-display .amount {
    font-size: 5rem;
  }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  .cta-section,
  .recalculate-btn,
  .site-header,
  .site-footer {
    display: none;
  }
  
  .results-card {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}