:root {
  --ecost-accent: #0f766e;
  --ecost-accent-2: #1d4ed8;
  --ecost-shell: linear-gradient(180deg, #f0fdf9 0%, #ffffff 52%);
  --ecost-border: #bfdbfe;
  --ecost-panel: #ffffff;
  --ecost-note: #475569;
  --ecost-muted: #64748b;
  --ecost-warn-bg: #fff7ed;
  --ecost-warn-border: #fdba74;
  --ecost-error-bg: #fef2f2;
  --ecost-error-border: #fca5a5;
  --ecost-result-bg: linear-gradient(180deg, #f0fdf9 0%, #eff6ff 100%);
}

.ecost-note {
  color: var(--ecost-note);
}

.ecost-shell {
  border: 1px solid var(--ecost-border);
  background:
    radial-gradient(circle at top right, rgba(59, 130, 246, 0.12), transparent 18rem),
    radial-gradient(circle at left center, rgba(16, 185, 129, 0.12), transparent 18rem),
    var(--ecost-shell);
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--ecost-accent-2);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ecost-toolbar,
.ecost-tabs,
.ecost-example-row,
.ecost-button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.ecost-toolbar {
  align-items: end;
  margin-bottom: 16px;
}

.ecost-check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--border, #dbe3f0);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.85);
}

.ecost-tabs {
  margin-bottom: 16px;
}

.ecost-tabs .button.active {
  background: linear-gradient(135deg, var(--ecost-accent), var(--ecost-accent-2));
  border-color: var(--ecost-accent);
  color: #fff;
}

.ecost-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1.45fr) minmax(290px, 0.95fr);
}

.ecost-card {
  background: var(--ecost-panel);
  border: 1px solid var(--border, #dbe3f0);
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.05);
}

.ecost-heading-row {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
}

.ecost-mini-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  margin-bottom: 12px;
}

.ecost-action-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: end;
}

.ecost-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ecost-summary-grid {
  display: grid;
  gap: 10px;
}

.ecost-summary-item {
  border: 1px solid var(--border, #dbe3f0);
  border-radius: 14px;
  padding: 14px;
  background: #fff;
}

.ecost-summary-item--primary {
  background: var(--ecost-result-bg);
}

.ecost-summary-item--full {
  grid-column: 1 / -1;
}

.ecost-summary-label {
  display: block;
  color: var(--ecost-muted);
  font-size: 0.92rem;
}

.ecost-summary-value {
  display: block;
  margin-top: 4px;
  font-size: 1.55rem;
  font-weight: 800;
  color: #0f172a;
}

.ecost-summary-note {
  display: block;
  margin-top: 6px;
  color: var(--ecost-note);
}

.ecost-message {
  margin-bottom: 12px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid transparent;
}

.ecost-message ul {
  margin: 0;
  padding-left: 18px;
}

.ecost-message--warn {
  background: var(--ecost-warn-bg);
  border-color: var(--ecost-warn-border);
}

.ecost-message--error {
  background: var(--ecost-error-bg);
  border-color: var(--ecost-error-border);
}

.ecost-table {
  width: 100%;
  border-collapse: collapse;
}

.ecost-table th,
.ecost-table td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--border, #dbe3f0);
  text-align: left;
  vertical-align: top;
}

.ecost-table th {
  font-size: 0.9rem;
  color: var(--ecost-muted);
}

.ecost-table td .input {
  min-width: 92px;
}

@media (max-width: 940px) {
  .ecost-grid {
    grid-template-columns: 1fr;
  }
}