:root {
  --bg: #f7f8fa;
  --card-bg: #ffffff;
  --text: #1a1d23;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent-us: #2563eb;
  --accent-in: #ea580c;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  background: linear-gradient(135deg, #1e3a8a, #2563eb);
  color: #fff;
  padding: 32px 0 24px;
}

.site-header h1 {
  margin: 0 0 4px;
  font-size: 1.8rem;
}

.tagline {
  margin: 0;
  color: #dbeafe;
  font-size: 0.95rem;
}

.ad-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #eef0f3;
  border: 1px dashed #c7cbd1;
  color: var(--muted);
  font-size: 0.8rem;
  border-radius: var(--radius);
  min-height: 60px;
  margin: 20px auto;
}

.ad-top, .ad-bottom { max-width: 960px; }
.ad-mid { margin: 24px 0; }

main.container {
  padding-top: 8px;
  padding-bottom: 20px;
}

.input-panel, .compare-panel {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

.field {
  margin-bottom: 16px;
}

.field:last-child { margin-bottom: 0; }

label {
  display: block;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 6px;
  color: var(--muted);
}

input, select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: #fff;
  color: var(--text);
}

input:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.income-row {
  display: flex;
  gap: 10px;
}

.income-row input { flex: 1; }
.income-row select { width: 110px; }

.rate-row {
  display: flex;
  gap: 10px;
}

.rate-row input { flex: 1; }

.rate-row button {
  width: 42px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--primary);
}

.rate-row button:hover { background: #eef2ff; }
.rate-row button:disabled { color: var(--muted); cursor: wait; }

.hint {
  margin: 6px 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}

/* Add-country controls */

.add-country-row { margin-bottom: 14px; }

.add-country-controls {
  display: flex;
  gap: 10px;
}

.add-country-controls select { flex: 1; }

.add-country-controls button {
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}

.add-country-controls button:hover { background: var(--primary-dark); }
.add-country-controls button:disabled { background: var(--border); color: var(--muted); cursor: not-allowed; }

.country-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #eef2ff;
  color: var(--primary-dark);
  border: 1px solid #c7d2fe;
  border-radius: 999px;
  padding: 6px 8px 6px 12px;
  font-size: 0.85rem;
  font-weight: 600;
}

.chip button {
  border: none;
  background: transparent;
  color: var(--primary-dark);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  padding: 2px 4px;
}

.chip button:hover { color: #b91c1c; }

/* Comparison table */

.table-scroll {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 420px;
}

.comparison-table th, .comparison-table td {
  text-align: right;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.comparison-table th.row-label-header, .comparison-table td.row-label {
  text-align: left;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
}

.comparison-table thead th {
  font-size: 0.95rem;
  color: var(--text);
  border-bottom: 2px solid var(--border);
  position: relative;
}

.comparison-table .remove-col {
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.9rem;
  margin-left: 8px;
}

.comparison-table .remove-col:hover { color: #b91c1c; }

.comparison-table tr.emphasize td {
  font-weight: 700;
  color: var(--primary-dark);
}

.comparison-table .empty-state {
  padding: 24px 0;
  text-align: center;
  color: var(--muted);
}

/* Detail cards */

.details-heading {
  font-size: 1.1rem;
  margin: 0 0 16px;
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.result-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  background: #fafbfc;
}

.result-card.us { border-top: 4px solid var(--accent-us); }
.result-card.in { border-top: 4px solid var(--accent-in); }

.result-card h3 {
  margin: 0 0 12px;
  font-size: 1.05rem;
}

.result-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

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

.result-row .label { color: var(--muted); }
.result-row .value { font-weight: 600; }

.result-row.total .value {
  color: var(--primary-dark);
  font-size: 1.05rem;
}

.site-footer {
  padding: 20px 0 40px;
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
}

@media (max-width: 640px) {
  .add-country-controls { flex-direction: column; }
  .details-grid { grid-template-columns: 1fr; }
}