.preview-frame {
  display: grid;
  gap: var(--sz-space-4);
  padding: var(--sz-space-5);
}

.calculator-preview {
  border: 1px solid var(--sz-color-border);
  border-radius: var(--sz-radius-md);
  background: var(--sz-color-surface);
}

.preview-shell {
  display: grid;
  gap: var(--sz-space-3);
  padding: var(--sz-space-5);
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sz-space-4);
}

.preview-title {
  margin: 0;
  font-size: 15px;
  font-weight: 750;
}

.preview-tools {
  display: flex;
  gap: var(--sz-space-2);
}

.device-toggle {
  display: inline-flex;
  border: 1px solid var(--sz-color-border);
  border-radius: var(--sz-radius-md);
  padding: 3px;
  background: var(--sz-color-surface);
  box-shadow: var(--sz-shadow-sm);
}

.device-toggle span {
  border-radius: 6px;
  padding: 5px 9px;
  color: var(--sz-color-text-soft);
  font-size: 12px;
  font-weight: 700;
  transition: background-color 160ms ease, color 160ms ease;
}

.device-toggle span:hover {
  background: #f5f7fb;
  color: var(--sz-color-text);
}

.device-toggle .is-active {
  background: var(--sz-color-surface-muted);
  color: var(--sz-color-text);
}

.preview-canvas {
  border: 1px solid var(--sz-color-border);
  border-radius: var(--sz-radius-lg);
  background:
    radial-gradient(circle at top left, rgba(49, 87, 255, 0.13), transparent 34%),
    linear-gradient(180deg, #f4f7fb 0%, #e9eef6 100%);
  padding: var(--sz-space-4);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.78),
    0 8px 24px rgba(15, 23, 42, 0.05);
}

.calculator-card {
  display: grid;
  gap: 16px;
  border: 1px solid rgba(203, 213, 225, 0.82);
  border-radius: var(--sz-radius-lg);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(251, 253, 255, 0.98) 100%);
  padding: 22px;
  box-shadow:
    0 24px 54px rgba(15, 23, 42, 0.14),
    0 2px 6px rgba(15, 23, 42, 0.05),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.calculator-card:hover {
  transform: translateY(-2px);
  border-color: rgba(148, 163, 184, 0.9);
  box-shadow:
    0 28px 64px rgba(15, 23, 42, 0.18),
    0 4px 10px rgba(15, 23, 42, 0.07),
    inset 0 1px 0 rgba(255, 255, 255, 0.92);
}

.calculator-brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sz-space-3);
}

.calculator-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--sz-space-2);
  color: #0f172a;
  font-weight: 800;
}

.calculator-logo-mark {
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border-radius: 7px;
  background: linear-gradient(180deg, #0f172a, #253044);
  color: #ffffff;
  font-size: 13px;
  box-shadow: 0 6px 14px rgba(15, 23, 42, 0.16);
}

.calculator-badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  border: 1px solid rgba(49, 87, 255, 0.15);
  border-radius: 999px;
  padding: 0 10px;
  background: rgba(49, 87, 255, 0.08);
  color: var(--sz-color-primary);
  font-size: 12px;
  font-weight: 760;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.calculator-heading h3 {
  margin: 0;
  color: #0f172a;
  font-size: 21px;
  font-weight: 820;
  letter-spacing: 0;
  line-height: 1.15;
}

.calculator-heading p {
  margin: var(--sz-space-2) 0 0;
  color: var(--sz-color-text-muted);
  font-size: 13px;
  line-height: 1.5;
}

.mock-fields {
  display: grid;
  gap: var(--sz-space-3);
}

.mock-field {
  display: grid;
  gap: 7px;
}

.mock-field label {
  color: #475569;
  font-size: 12px;
  font-weight: 760;
}

.mock-help {
  margin: -2px 0 0;
  color: #718096;
  font-size: 11px;
  line-height: 1.35;
}

.mock-input {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  border: 1px solid #d8e0ea;
  border-radius: var(--sz-radius-md);
  padding: 0 13px;
  background:
    linear-gradient(180deg, #ffffff 0%, #fbfcfe 100%);
  color: #111827;
  box-shadow:
    0 1px 2px rgba(15, 23, 42, 0.04),
    inset 0 1px 0 rgba(255, 255, 255, 0.85);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.preview-value-input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  color: #111827;
  font: inherit;
  font-size: 15px;
  font-weight: 760;
  outline: 0;
}

.preview-value-input::placeholder {
  color: #9aa4b2;
}

.mock-input:hover {
  border-color: rgba(49, 87, 255, 0.42);
  box-shadow:
    0 0 0 3px rgba(49, 87, 255, 0.08),
    0 2px 5px rgba(15, 23, 42, 0.05);
  transform: translateY(-1px);
}

.input-prefix,
.input-suffix {
  color: #64748b;
  font-size: 13px;
  font-weight: 720;
}

.input-value {
  flex: 1;
  font-size: 15px;
  font-weight: 760;
}

.mock-result {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--sz-space-4);
  border: 1px solid rgba(49, 87, 255, 0.14);
  border-radius: var(--sz-radius-lg);
  padding: 16px;
  background:
    linear-gradient(135deg, rgba(49, 87, 255, 0.12), rgba(14, 165, 164, 0.08)),
    #f7faff;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.78),
    0 8px 20px rgba(49, 87, 255, 0.08);
}

.mock-result span {
  display: block;
  margin-bottom: 4px;
  color: #536179;
  font-size: 12px;
  font-weight: 760;
}

.mock-result small {
  display: block;
  margin: -2px 0 5px;
  color: #718096;
  font-size: 11px;
  font-weight: 700;
}

.mock-result strong {
  color: var(--sz-color-primary);
  font-size: 30px;
  font-weight: 850;
  line-height: 1.1;
}

.result-breakdown {
  border-left: 1px solid rgba(49, 87, 255, 0.16);
  padding-left: var(--sz-space-4);
  text-align: right;
}

.result-breakdown strong {
  color: #0f172a;
  font-size: 16px;
}

.mock-button {
  display: grid;
  min-height: 42px;
  place-items: center;
  border-radius: var(--sz-radius-lg);
  background: linear-gradient(180deg, #496aff 0%, var(--sz-color-primary) 100%);
  color: #ffffff;
  font-weight: 750;
  box-shadow:
    0 12px 24px rgba(49, 87, 255, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.16);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.mock-button:hover {
  transform: translateY(-1px);
  box-shadow:
    0 16px 30px rgba(49, 87, 255, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.mock-button:active {
  transform: translateY(0);
  box-shadow:
    0 8px 18px rgba(49, 87, 255, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.16);
}

.preview-empty-note {
  display: flex;
  align-items: flex-start;
  gap: var(--sz-space-3);
  border: 1px dashed var(--sz-color-border-strong);
  border-radius: var(--sz-radius-lg);
  padding: var(--sz-space-3);
  background:
    linear-gradient(135deg, rgba(49, 87, 255, 0.05), rgba(14, 165, 164, 0.04)),
    #fafcff;
  color: var(--sz-color-text-muted);
  font-size: 12px;
  line-height: 1.45;
}

.live-preview .surface-body {
  gap: 10px;
  padding: var(--sz-space-3);
}

.live-preview .settings-stack {
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--sz-color-border);
  border-radius: var(--sz-radius-lg);
  background: #ffffff;
}

.live-preview .setting-line {
  padding: 11px var(--sz-space-3);
}