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

:root {
  --navy: #0f1e36;
  --navy-light: #1a3055;
  --green: #22c55e;
  --green-dim: #16a34a;
  --gray-bg: #f4f6f9;
  --gray-border: #d1d9e6;
  --gray-text: #6b7a99;
  --white: #ffffff;
  --text: #1a2540;
  --shadow: 0 2px 12px rgba(15, 30, 54, 0.10);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gray-bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
header {
  background: var(--navy);
  padding: 2rem 0 1.75rem;
  border-bottom: 3px solid var(--green);
}

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

header h1 {
  color: var(--white);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

header .subtitle {
  color: #8aa4c8;
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

.share-btn {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  background: rgba(255,255,255,0.1);
  border: 1.5px solid rgba(255,255,255,0.2);
  color: #c9d8f0;
  border-radius: 8px;
  padding: 0.5rem 0.9rem;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.share-btn:hover {
  background: rgba(255,255,255,0.18);
  border-color: rgba(255,255,255,0.35);
  color: var(--white);
}

.share-btn.copied {
  background: rgba(34,197,94,0.2);
  border-color: var(--green);
  color: var(--green);
}

/* Main */
main { flex: 1; padding: 2.5rem 0; }

/* Card */
.card {
  background: var(--white);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  margin: 2rem 0;
}

.card-header {
  background: var(--navy-light);
  padding: 1.25rem 1.5rem;
}

.card-header h2 {
  color: var(--white);
  font-size: 1.15rem;
  font-weight: 600;
}

.card-header .card-desc {
  color: #8aa4c8;
  font-size: 0.82rem;
  margin-top: 0.2rem;
}

.card-body { padding: 1.5rem; }

/* Fields */
.field { margin-bottom: 1.1rem; }

.field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gray-text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.4rem;
}

.hint {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.78rem;
  color: #9aaabf;
}

.label-hint {
  display: block;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.75rem;
  color: #9aaabf;
  margin-top: 0.05rem;
}

.input-wrap {
  display: flex;
  align-items: center;
  border: 1.5px solid var(--gray-border);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.15s;
}

.input-wrap:focus-within { border-color: var(--navy-light); }

.prefix, .suffix {
  padding: 0 0.75rem;
  background: #eef2f8;
  color: var(--gray-text);
  font-size: 0.95rem;
  font-weight: 500;
  align-self: stretch;
  display: flex;
  align-items: center;
  user-select: none;
}

.input-wrap input {
  flex: 1;
  border: none;
  outline: none;
  padding: 0.65rem 0.75rem;
  font-size: 1rem;
  color: var(--text);
  background: transparent;
  min-width: 0;
}

input[type=number]::-webkit-inner-spin-button { -webkit-appearance: none; }

select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  font-size: 0.95rem;
  color: var(--text);
  border: 1.5px solid var(--gray-border);
  border-radius: 8px;
  background: var(--white);
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236b7a99' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  transition: border-color 0.15s;
}

select:focus { border-color: var(--navy-light); }

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

/* Toggle */
.toggle-field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #f8fafc;
  border: 1.5px solid var(--gray-border);
  border-radius: 8px;
  padding: 0.65rem 0.9rem;
  margin-bottom: 1.1rem;
}

.toggle-label {
  display: flex;
  flex-direction: column;
  margin-bottom: 0 !important;
  text-transform: none !important;
  letter-spacing: 0 !important;
  font-size: 0.95rem !important;
  font-weight: 500 !important;
  color: var(--text) !important;
}

.toggle-label .toggle-hint {
  font-size: 0.75rem;
  color: var(--gray-text);
  font-weight: 400;
  margin-top: 0.1rem;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 46px;
  height: 26px;
  flex-shrink: 0;
  margin-left: 1rem;
}

.toggle-switch input { opacity: 0; width: 0; height: 0; }

.slider {
  position: absolute;
  inset: 0;
  background: #d1d9e6;
  border-radius: 26px;
  cursor: pointer;
  transition: background 0.2s;
}

.slider::before {
  content: '';
  position: absolute;
  height: 20px;
  width: 20px;
  left: 3px;
  top: 3px;
  background: white;
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

.toggle-switch input:checked + .slider { background: var(--green-dim); }
.toggle-switch input:checked + .slider::before { transform: translateX(20px); }

/* Results */
.results { margin-top: 1.4rem; }

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.65rem 0;
  border-bottom: 1px solid #eef2f8;
  font-size: 0.97rem;
}

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

.result-row.breakdown { color: var(--gray-text); font-size: 0.88rem; }

.result-row.highlight {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}

.money {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--green-dim);
}

.result-row.highlight .money {
  color: var(--green);
  font-size: 1.1rem;
}

.divider {
  height: 1px;
  background: var(--gray-border);
  margin: 0.5rem 0;
}

.tag {
  font-size: 0.72rem;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  vertical-align: middle;
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
}

.tax-free {
  color: var(--green-dim);
  background: #dcfce7;
}


.field-warn {
  font-size: 0.75rem;
  color: #b45309;
  margin-top: 0.35rem;
  min-height: 1em;
}

.rate-hint {
  text-align: center;
  font-size: 0.82rem;
  color: var(--gray-text);
  margin-bottom: 1.5rem;
}

.rate-hint a {
  color: var(--navy-light);
  text-decoration: underline;
}

.rate-hint a:hover { color: var(--green-dim); }

/* FAQ */
.faq {
  margin: 2.5rem 0 2rem;
}

.faq h2 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.faq details {
  background: var(--white);
  border: 1.5px solid var(--gray-border);
  border-radius: 8px;
  margin-bottom: 0.5rem;
  overflow: hidden;
}

.faq summary {
  padding: 0.85rem 1rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: '+';
  font-size: 1.1rem;
  color: var(--gray-text);
  flex-shrink: 0;
  margin-left: 0.75rem;
}

.faq details[open] summary::after { content: '−'; }

.faq details p {
  padding: 0 1rem 0.9rem;
  font-size: 0.88rem;
  color: var(--gray-text);
  line-height: 1.6;
  border-top: 1px solid #eef2f8;
  padding-top: 0.75rem;
}

/* Footer */
footer {
  background: var(--navy);
  color: #8aa4c8;
  font-size: 0.8rem;
  padding: 1rem 0;
  text-align: center;
}

.footer-links {
  margin-top: 0.35rem;
}

.footer-links a {
  color: #8aa4c8;
  text-decoration: none;
}

.footer-links a:hover { color: var(--white); }

/* Legal pages */
.legal-page {
  background: var(--white);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 2rem;
  margin: 2rem 0;
}

.legal-page h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.25rem;
}

.legal-page h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin: 1.25rem 0 0.35rem;
}

.legal-meta {
  font-size: 0.78rem;
  color: var(--gray-text);
  margin-bottom: 1.25rem;
}

.legal-page p, .legal-page li {
  font-size: 0.9rem;
  color: var(--gray-text);
  line-height: 1.65;
}

.legal-page ul {
  padding-left: 1.25rem;
  margin: 0.75rem 0;
}

.legal-page li { margin-bottom: 0.5rem; }

/* Responsive */
@media (max-width: 540px) {
  .field-row { grid-template-columns: 1fr; }
  header h1 { font-size: 1.5rem; }
  .share-btn span { display: none; }
}