/* TinyCalc — Shared Design System */

:root {
  /* Navy base (shared across Tiny products) */
  --navy-900: #1f2744;
  --navy-700: #334155;
  --navy-50: #F8FAFC;

  /* Blue accent (TinyCalc identity) */
  --blue-500: #3B82F6;
  --blue-50: #EFF6FF;

  /* Semantic colours */
  --green-500: #11B981;
  --coral-500: #F97066;

  /* Warm neutrals (shared) */
  --warm-50: #FAFAF9;
  --warm-200: #E7E5E4;
  --warm-400: #A8A29E;
  --warm-900: #1C1917;

  /* Mapped to usage */
  --color-primary: var(--navy-900);
  --color-primary-dark: var(--navy-900);
  --color-primary-light: var(--blue-500);
  --color-accent: var(--blue-500);
  --color-success: var(--green-500);
  --color-success-light: var(--green-500);
  --color-deduction: var(--coral-500);
  --color-background: var(--navy-50);
  --color-card: #ffffff;
  --color-text: var(--navy-700);
  --color-text-muted: #64748b;
  --color-border: var(--warm-200);
  --color-input-bg: var(--warm-50);
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
  --radius-sm: 6px;
  --radius-md: 6px;
  --radius-lg: 12px;
  --radius-xl: 12px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-background);
  color: var(--color-text);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
}

/* Header */
.site-header {
  background: #ffffff;
  color: var(--navy-900);
  padding: 1rem 0;
  border-bottom: 1px solid var(--warm-200);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy-900);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.site-logo img {
  display: block;
}

.site-logo:hover {
  color: var(--blue-500);
}

.logo-product {
  font-weight: 400;
  color: var(--color-text-muted);
  line-height: 1;
}

.header-nav {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
}

.nav-link:hover {
  color: var(--blue-500);
}

.site-tagline {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  display: none;
}

@media (min-width: 768px) {
  .site-tagline {
    display: block;
  }
}

/* Main Content */
.main-content {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
}

/* SEO Title (visually styled but SEO-friendly) */
.page-title {
  text-align: center;
  margin-bottom: 2rem;
}

.page-title h1 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 0.5rem 0;
}

.page-title .subtitle {
  color: var(--color-text-muted);
  font-size: 1rem;
}

@media (min-width: 768px) {
  .page-title h1 {
    font-size: 2rem;
  }
}

/* Calculator Card */
.calculator-card {
  background: var(--color-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  margin-bottom: 2rem;
}

/* Calculator Header */
.calculator-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: white;
  padding: 1.5rem;
  text-align: center;
}

.calculator-header h2 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

/* Calculator Body */
.calculator-body {
  padding: 1.5rem;
}

@media (min-width: 768px) {
  .calculator-body {
    padding: 2rem;
  }
}

/* Input Section */
.input-section {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
  .input-section {
    grid-template-columns: 2fr 1fr 1fr;
    gap: 1.5rem;
  }
}

.input-group {
  display: flex;
  flex-direction: column;
}

.input-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.salary-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.currency-symbol {
  position: absolute;
  left: 1rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-muted);
  pointer-events: none;
}

.salary-input {
  width: 100%;
  padding: 0.875rem 1rem 0.875rem 2.5rem;
  font-size: 1.5rem;
  font-weight: 700;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-input-bg);
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.salary-input:focus {
  outline: none;
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.salary-input::placeholder {
  color: var(--color-text-muted);
  font-weight: 400;
}

.select-input {
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: 0.9375rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-input-bg);
  color: var(--color-text);
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2364748b'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1.25rem;
  padding-right: 2.5rem;
}

.select-input:focus {
  outline: none;
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Results Hero */
.results-hero {
  background: var(--blue-50);
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

.results-hero-label {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-success);
  margin-bottom: 0.5rem;
}

.results-hero-amount {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-success);
  line-height: 1.2;
  margin-bottom: 0.25rem;
}

.results-hero-period {
  font-size: 1rem;
  color: var(--color-success);
  opacity: 0.8;
}

@media (min-width: 768px) {
  .results-hero {
    padding: 2rem;
  }

  .results-hero-amount {
    font-size: 3.5rem;
  }
}

/* Frequency Tabs */
.frequency-tabs {
  display: flex;
  background: var(--color-input-bg);
  border-radius: var(--radius-md);
  padding: 0.25rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
  border: 2px solid var(--color-border);
}

.frequency-tab {
  flex: 1;
  padding: 0.625rem 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  text-align: center;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  white-space: nowrap;
  min-width: 60px;
}

.frequency-tab:hover {
  color: var(--color-text);
  background: rgba(0, 0, 0, 0.05);
}

.frequency-tab.active {
  background: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

@media (min-width: 768px) {
  .frequency-tab {
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
  }
}

/* Breakdown Table */
.breakdown-section {
  margin-bottom: 1.5rem;
}

.breakdown-table {
  width: 100%;
  border-collapse: collapse;
}

.breakdown-row {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

.breakdown-row:last-child {
  border-bottom: none;
}

.breakdown-row.total {
  border-top: 2px solid var(--color-border);
  border-bottom: none;
  padding-top: 1rem;
  margin-top: 0.5rem;
}

.breakdown-label {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.breakdown-value {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

.breakdown-row.total .breakdown-label,
.breakdown-row.total .breakdown-value {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-success);
}

.breakdown-row.deduction .breakdown-value {
  color: var(--coral-500);
}

/* Employer Section */
.employer-section {
  background: var(--color-input-bg);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-top: 1rem;
}

.employer-section .breakdown-row {
  padding: 0.5rem 0;
}

.employer-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

/* Info Cards Grid */
.info-grid {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
}

@media (min-width: 768px) {
  .info-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.info-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
}

.info-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 1rem 0;
}

/* Footer Links */
.related-links {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  margin-top: 2rem;
}

.related-links h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 1rem 0;
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

@media (min-width: 768px) {
  .links-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.related-link {
  color: var(--color-primary);
  text-decoration: none;
  font-size: 0.875rem;
  padding: 0.375rem 0;
  transition: color 0.2s;
}

.related-link:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* Content Card (for text pages like Privacy, Terms) */
.content-card {
  background: var(--color-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 2rem;
  margin-bottom: 2rem;
}

.content-card h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 1.5rem 0 0.75rem 0;
}

.content-card h2:first-child {
  margin-top: 0;
}

.content-card p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.content-card ul {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.content-card li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.content-card a {
  color: var(--color-primary);
  text-decoration: none;
}

.content-card a:hover {
  text-decoration: underline;
}

/* Site Footer */
.site-footer {
  background: var(--warm-900);
  color: var(--warm-400);
  padding: 2rem 0;
  margin-top: auto;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-heading {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #e7e5e4;
  margin: 0 0 0.5rem 0;
}

.footer-col a {
  color: var(--warm-400);
  text-decoration: none;
  font-size: 0.875rem;
}

.footer-col a:hover {
  color: white;
}

.footer-copyright {
  font-size: 0.875rem;
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  margin: 0;
}

/* Utility Classes */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Loading State */
.calculating {
  opacity: 0.7;
  pointer-events: none;
}

/* Number Animation */
.amount-transition {
  transition: opacity 0.15s ease-out;
}

/* No JS Fallback */
.no-js .frequency-tabs {
  display: none;
}

.no-js .calculate-btn {
  display: block;
}

.calculate-btn {
  display: none;
  width: 100%;
  padding: 1rem;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 1rem;
}

.calculate-btn:hover {
  background: var(--color-primary-dark);
}

/* VAT Calculator */
.vat-input-section {
  grid-template-columns: 1fr !important;
}

@media (min-width: 768px) {
  .vat-input-section {
    grid-template-columns: 2fr 1fr !important;
  }
}

.vat-btn-group {
  display: flex;
  gap: 0.75rem;
}

.vat-btn-group .calculate-btn {
  display: block;
  flex: 1;
  padding: 0.875rem 1.5rem;
  font-size: 0.9375rem;
  margin-top: 0;
  width: auto;
}

.vat-btn-plus {
  background: var(--navy-900);
}

.vat-btn-minus {
  background: var(--color-text-muted);
}

.vat-btn-minus:hover {
  background: var(--navy-700);
}

/* Homepage (tinycalc.co.uk) */
.hero-section {
  text-align: center;
  padding: 4rem 1.5rem 3rem;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--navy-900);
  margin: 0 0 0.75rem 0;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin: 0 0 3rem 0;
}

.calc-grid {
  display: grid;
  gap: 1.5rem;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

@media (min-width: 768px) {
  .calc-grid {
    grid-template-columns: repeat(3, 1fr);
    max-width: 1200px;
  }
}

.calc-card {
  background: var(--color-card);
  border: 1px solid var(--warm-200);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.2s, border-color 0.2s;
}

.calc-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--blue-500);
}

.calc-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy-900);
  margin: 0 0 0.5rem 0;
}

.calc-card-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin: 0 0 1rem 0;
  line-height: 1.6;
}

.calc-card-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--blue-500);
}

/* Dividend Calculator */
.dividend-input-section {
  grid-template-columns: 1fr !important;
}

@media (min-width: 768px) {
  .dividend-input-section {
    grid-template-columns: 2fr 2fr 1fr !important;
  }
}

/* Print Styles */
@media print {
  .site-header,
  .site-footer,
  .frequency-tabs,
  .related-links {
    display: none;
  }

  .calculator-card {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}