.tool-main-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 1.25rem;
  max-width: 400px;
  margin: 0 auto;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  box-shadow: var(--shadow-base);
  position: relative;
  overflow: hidden;
}

.calculator-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: relative;
  z-index: 1;
}

.panel-section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-base);
  opacity: 0.7;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.input-row {
  display: flex;
  gap: 0.75rem;
}

.input-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.input-label {
  font-size: 0.75rem;
  color: var(--text-base);
  opacity: 0.6;
  font-weight: 600;
}

.stepper-wrap {
  display: flex;
  align-items: center;
  background: var(--bg-page);
  border: 1px solid var(--border-base);
  border-radius: 0.75rem;
  overflow: hidden;
  transition: border-color 0.2s;
}

.stepper-wrap:focus-within {
  border-color: var(--accent);
}

.stepper-input {
  width: 100%;
  padding: 0.6rem 0.25rem;
  border: none;
  background: transparent;
  color: var(--text-base);
  font-size: 0.875rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
  box-sizing: border-box;
  -moz-appearance: textfield;
}

.stepper-input::-webkit-inner-spin-button,
.stepper-input::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.stepper-input:focus {
  outline: none;
}

.stepper-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 2.2rem;
  padding: 0.5rem;
  border: none;
  background: transparent;
  color: var(--text-base);
  opacity: 0.5;
  font-size: 0.8125rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.stepper-btn:hover {
  background: var(--bg-page);
  color: var(--accent);
  opacity: 1;
}

.stepper-btn:active {
  background: var(--border-base);
  transform: scale(0.95);
}

.taper-chips {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.375rem;
}

.taper-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  padding: 0.6rem 0.5rem;
  border: 1px solid var(--border-base);
  border-radius: 0.75rem;
  background: var(--bg-page);
  cursor: pointer;
  transition: all 0.2s ease;
}

.taper-chip:hover {
  border-color: var(--accent);
}

.taper-chip.active {
  background: var(--bg-surface);
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.taper-chip-label {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text-base);
}

.taper-chip-sub {
  font-size: 0.65rem;
  color: var(--text-base);
  opacity: 0.5;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.strap-visual {
  display: flex;
  justify-content: center;
  padding: 0.5rem 0;
}

.strap-visual svg {
  display: block;
}

.strap-visual polygon {
  transition: all 0.4s ease;
}

.result-card {
  background: var(--bg-page);
  border: 1px solid var(--border-base);
  border-radius: 1rem;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.result-header {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-base);
  opacity: 0.5;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.result-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
}

.result-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.result-unit {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-base);
  opacity: 0.5;
}

.result-label {
  font-size: 0.6rem;
  font-weight: 600;
  color: var(--text-base);
  opacity: 0.5;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.score-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-base);
}

.score-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-base);
  opacity: 0.6;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.score-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 2rem;
  font-size: 0.75rem;
  font-weight: 700;
}

.score-excellent {
  background: color-mix(in srgb, var(--color-success, #22c55e) 15%, transparent);
  color: var(--color-success, #22c55e);
  border: 1px solid color-mix(in srgb, var(--color-success, #22c55e) 30%, transparent);
}

.score-good {
  background: color-mix(in srgb, var(--color-warning, #f59e0b) 15%, transparent);
  color: var(--color-warning, #f59e0b);
  border: 1px solid color-mix(in srgb, var(--color-warning, #f59e0b) 30%, transparent);
}

.score-fair {
  background: color-mix(in srgb, var(--color-danger, #ef4444) 15%, transparent);
  color: var(--color-danger, #ef4444);
  border: 1px solid color-mix(in srgb, var(--color-danger, #ef4444) 30%, transparent);
}

.score-unbalanced {
  background: color-mix(in srgb, var(--color-warning, #f59e0b) 15%, transparent);
  color: var(--color-warning, #f59e0b);
  border: 1px solid color-mix(in srgb, var(--color-warning, #f59e0b) 30%, transparent);
}

.tip-row {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg-page);
  border-radius: 0.75rem;
  border: 1px solid var(--border-base);
}

.tip-icon {
  flex-shrink: 0;
  margin-top: 0.1rem;
  color: var(--accent);
}

.tip-text {
  font-size: 0.8rem;
  color: var(--text-base);
  opacity: 0.85;
  line-height: 1.5;
}

@media (max-width: 520px) {
  .tool-main-card {
    padding: 1rem;
  }

  .input-row {
    flex-direction: column;
    gap: 0.5rem;
  }

  .taper-chips {
    grid-template-columns: 1fr 1fr;
  }
}