/* Modern Web Guidance Standards - Pure Modern CSS */
:root {
  --primary: #1e3a8a;          /* Classic Financial Deep Navy */
  --primary-hover: #172554;
  --accent: #0284c7;           /* Vibrant Cerulean Accent */
  --accent-hover: #0369a1;
  --success: #059669;          /* Emerald Success */
  --success-bg: #ecfdf5;
  --warning: #d97706;          /* Amber Notice */
  --surface: #ffffff;
  --bg: #f8fafc;
  --text-main: #0f172a;
  --text-muted: #475569;
  --border: #e2e8f0;
  --border-focus: #38bdf8;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Accessibility Focus States */
:focus-visible {
  outline: 3px solid var(--border-focus);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: 900px;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* Header */
.site-header {
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  padding-block: 1rem;
  position: sticky;
  top: 0;
  z-index: 20;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary);
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
}

.brand-icon {
  stroke: var(--accent);
}

.privacy-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--success-bg);
  color: var(--success);
  border: 1px solid #a7f3d0;
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
}

.privacy-pill .dot {
  width: 8px;
  height: 8px;
  background-color: var(--success);
  border-radius: 50%;
  display: inline-block;
}

/* Hero Section */
.hero-section {
  padding-block: 3rem 2rem;
  text-align: center;
}

.hero-tag {
  display: inline-block;
  background-color: #e0f2fe;
  color: var(--accent-hover);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  margin-bottom: 1rem;
}

.hero-section h1 {
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.accent-text {
  color: var(--accent);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 680px;
  margin-inline: auto;
}

/* Calculator Card */
.calculator-wrapper {
  margin-bottom: 3.5rem;
}

.card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.calc-card {
  padding: clamp(1.5rem, 3vw, 2.5rem);
}

.card-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.25rem;
  margin-bottom: 1.75rem;
}

.card-header h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.35rem;
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* Form Layout */
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

.form-group.full-width {
  grid-column: 1 / -1;
}

label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

input, select {
  width: 100%;
  min-height: 48px; /* Touch Target standard */
  padding: 0.65rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
  color: var(--text-main);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.15s ease;
}

input:focus, select:focus {
  border-color: var(--accent);
}

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

.input-prefix-wrapper .currency-symbol {
  position: absolute;
  left: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
}

.input-prefix-wrapper input {
  padding-left: 1.85rem;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.75rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, transform 0.05s ease;
}

.btn:active {
  transform: scale(0.99);
}

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

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

.btn-accent {
  background-color: var(--accent);
  color: #ffffff;
}

.btn-accent:hover {
  background-color: var(--accent-hover);
}

.btn-block {
  width: 100%;
}

/* Results Box */
.results-container {
  margin-top: 2rem;
  padding: 1.75rem;
  background-color: var(--bg);
  border: 1.5px solid #cbd5e1;
  border-radius: var(--radius-md);
  animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.results-header {
  text-align: center;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.25rem;
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  margin-bottom: 0.5rem;
}

.badge-success {
  background-color: #d1fae5;
  color: #065f46;
}

.results-header h3 {
  font-size: 1.1rem;
  color: var(--text-muted);
  font-weight: 600;
}

.refund-amount-display {
  font-size: 3rem;
  font-weight: 800;
  color: var(--success);
  line-height: 1.1;
  margin-block: 0.25rem;
}

.refund-subtext {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.audit-summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

@media (max-width: 640px) {
  .audit-summary-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.summary-item {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
}

.summary-item .label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}

.summary-item .value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.summary-item .value.highlight {
  color: var(--accent);
}

/* Escalation Card */
.escalation-card {
  background-color: var(--surface);
  border: 1.5px solid #bae6fd;
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.escalation-card h4 {
  font-size: 1.15rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.escalation-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.package-features ul {
  list-style: none;
  margin-bottom: 1.25rem;
}

.package-features li {
  font-size: 0.88rem;
  color: var(--text-main);
  padding-block: 0.25rem;
}

/* Info Section */
.explanation-section {
  margin-bottom: 4rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

@media (max-width: 640px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

.info-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.icon-circle {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.info-card h3 {
  font-size: 1.15rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.info-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Modern Native <dialog> Modal */
dialog.modern-dialog {
  border: none;
  border-radius: var(--radius-lg);
  padding: 0;
  max-width: 540px;
  width: 90%;
  margin: auto;
  box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  background: var(--surface);
}

dialog::backdrop {
  background-color: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
}

.dialog-content {
  padding: 1.75rem;
}

.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1rem;
  margin-bottom: 1rem;
}

.dialog-header h3 {
  font-size: 1.25rem;
  color: var(--primary);
}

.dialog-close {
  background: none;
  border: none;
  font-size: 1.75rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
}

.dialog-instructions {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.dialog-price-box {
  background-color: #f0f9ff;
  border: 1px solid #bae6fd;
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  margin-block: 1rem;
}

.dialog-price-box .price-row {
  display: flex;
  justify-content: space-between;
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 0.2rem;
}

.dialog-price-box small {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Footer */
.site-footer {
  background-color: #0f172a;
  color: #94a3b8;
  padding-block: 3rem;
  font-size: 0.85rem;
}

.legal-disclaimer {
  background-color: #1e293b;
  border: 1px solid #334155;
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  margin-bottom: 2rem;
  line-height: 1.5;
  color: #cbd5e1;
}

.legal-disclaimer strong {
  color: #f8fafc;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  border-top: 1px solid #334155;
  padding-top: 1.5rem;
}