* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f5f6fa;
  color: #222;
}

.app {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.app-header {
  margin-bottom: 16px;
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 24px;
}

.subtitle {
  margin: 0;
  color: #666;
  font-size: 14px;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 4px;
  margin: 16px 0;
  border-bottom: 1px solid #ddd;
}

.tab-button {
  flex: 1;
  padding: 10px 8px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 14px;
  border-bottom: 2px solid transparent;
}

.tab-button.active {
  border-bottom-color: #2563eb;
  color: #2563eb;
  font-weight: 600;
  background: #eef2ff;
}

.tab-content {
  margin-top: 8px;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* Cards */
.card {
  background: #fff;
  border-radius: 8px;
  padding: 12px 12px 8px;
  margin-bottom: 12px;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.card-header h3 {
  margin: 0;
  font-size: 15px;
}

.card-body {
  border-top: 1px solid #eee;
  padding-top: 8px;
}

.card-body.disabled {
  opacity: 0.45;
  pointer-events: none;
}

/* Fields */
.field {
  margin-bottom: 10px;
}

.field.inline {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.field label {
  display: block;
  font-size: 13px;
  margin-bottom: 4px;
}

.input-with-unit {
  display: flex;
  align-items: center;
  gap: 4px;
}

.input-with-unit input {
  flex: 1;
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 14px;
}

.unit {
  font-size: 13px;
  color: #555;
}

.radio {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
}

.radio input {
  margin: 0;
}

/* Buttons */
.actions {
  margin-top: 16px;
  display: flex;
  gap: 8px;
}

button.primary,
button.secondary {
  padding: 8px 14px;
  border-radius: 999px;
  border: none;
  font-size: 14px;
  cursor: pointer;
}

button.primary {
  background: #2563eb;
  color: #fff;
}

button.secondary {
  background: #e5e7eb;
  color: #111827;
}

button.primary:hover {
  background: #1d4ed8;
}

button.secondary:hover {
  background: #d1d5db;
}

.pass-button {
  border-radius: 999px;
  border: 1px solid #e5e7eb;
  background: #f9fafb;
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
}

.pass-button.active {
  background: #fee2e2;
  border-color: #fca5a5;
  color: #b91c1c;
}

/* Summary */
.summary-line {
  margin-top: 8px;
  font-size: 13px;
  color: #374151;
}

.summary-line span {
  font-weight: 600;
}

/* Result */
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.result-card {
  background: #fff;
  border-radius: 8px;
  padding: 12px;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
  font-size: 14px;
}

.result-card h3 {
  margin: 0 0 8px;
  font-size: 15px;
}

.result-card p {
  margin: 4px 0;
}

.hidden {
  display: none;
}

.hint {
  font-size: 12px;
  color: #6b7280;
}