/* UK Calculators - Professional Public Sector Theme */
:root {
  --primary: #1e40af;
  --primary-dark: #1e3a8a;
  --secondary: #059669;
  --accent: #d97706;
  --danger: #dc2626;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 1rem 0;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  text-decoration: none;
  color: white;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo span { color: #93c5fd; }

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  flex-wrap: wrap;
}

.nav-links a {
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
  color: white;
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #eff6ff 0%, #e0f2fe 100%);
  padding: 3rem 0 2.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.hero h1 {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 0.75rem;
  line-height: 1.2;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.badge-year {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 700;
  margin-left: 0.5rem;
  vertical-align: middle;
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  padding: 2.5rem 0;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.75rem;
  transition: transform 0.2s, box-shadow 0.2s;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.card-icon.nhs { background: #dbeafe; }
.card-icon.teacher { background: #dcfce7; }
.card-icon.london { background: #fef3c7; }

.card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

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

.btn-secondary {
  background: var(--secondary);
  color: white;
}

.btn-secondary:hover {
  background: #047857;
}

.btn-block {
  width: 100%;
}

/* Calculator Page Layout */
.calc-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  padding: 2rem 0;
}

@media (max-width: 900px) {
  .calc-layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.75rem;
  border: 1px solid var(--border);
}

.panel h2 {
  font-size: 1.25rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Form Elements */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.form-group small {
  display: block;
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 0.25rem;
}

select, input[type="number"], input[type="text"] {
  width: 100%;
  padding: 0.65rem 0.875rem;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  background: white;
  transition: border-color 0.2s;
}

select:focus, input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.checkbox-group input {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

/* Results */
.result-box {
  background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
  border: 2px solid #059669;
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

.result-box h3 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #065f46;
  margin-bottom: 0.5rem;
}

.result-amount {
  font-size: 2.5rem;
  font-weight: 800;
  color: #064e3b;
  line-height: 1;
}

.result-period {
  color: #065f46;
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

.breakdown-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.breakdown-table th {
  text-align: left;
  padding: 0.75rem;
  border-bottom: 2px solid var(--border);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
}

.breakdown-table td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.breakdown-table tr:last-child td {
  border-bottom: none;
  font-weight: 700;
  color: var(--text);
}

.breakdown-table .amount {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.negative { color: var(--danger); }
.positive { color: var(--secondary); }

/* Info Boxes */
.info-box {
  background: #eff6ff;
  border-left: 4px solid var(--primary);
  padding: 1rem 1.25rem;
  border-radius: 0 8px 8px 0;
  margin: 1rem 0;
  font-size: 0.9rem;
}

.info-box.warning {
  background: #fffbeb;
  border-left-color: var(--accent);
}

.info-box p { margin: 0; }

/* Disclaimer */
.disclaimer {
  background: #f1f5f9;
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 1.5rem;
}

.disclaimer strong {
  color: var(--text);
}

/* Footer */
.site-footer {
  background: var(--text);
  color: #94a3b8;
  padding: 2rem 0;
  margin-top: 3rem;
  font-size: 0.9rem;
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-footer a {
  color: #cbd5e1;
  text-decoration: none;
}

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

/* Breadcrumb */
.breadcrumb {
  padding: 1rem 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

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

.breadcrumb a:hover {
  text-decoration: underline;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  border-bottom: 2px solid var(--border);
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.6rem 1rem;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.75rem; }
  .cards-grid { grid-template-columns: 1fr; }
  .site-header .container { flex-direction: column; align-items: flex-start; }
  .nav-links { gap: 1rem; }
  .result-amount { font-size: 2rem; }
}

/* Print */
@media print {
  .site-header, .site-footer, .btn { display: none; }
  .panel { box-shadow: none; border: 1px solid #ccc; }
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel {
  animation: fadeIn 0.4s ease-out;
}

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