/* CSS Variables (Design Tokens) */
:root {
  --background: hsl(40, 20%, 97%);
  --foreground: hsl(220, 20%, 14%);
  --card: hsl(0, 0%, 100%);
  --card-foreground: hsl(220, 20%, 14%);
  --primary: hsl(174, 62%, 32%);
  --primary-foreground: hsl(0, 0%, 100%);
  --secondary: hsl(40, 15%, 92%);
  --secondary-foreground: hsl(220, 20%, 14%);
  --muted: hsl(40, 10%, 94%);
  --muted-foreground: hsl(220, 10%, 46%);
  --accent: hsl(174, 40%, 92%);
  --accent-foreground: hsl(174, 62%, 22%);
  --border: hsl(220, 13%, 88%);
  --ring: hsl(174, 62%, 32%);
  --radius: 0.75rem;
  --deal-great: hsl(152, 60%, 40%);
  --deal-fair: hsl(174, 62%, 32%);
  --deal-slight: hsl(38, 92%, 50%);
  --deal-over: hsl(25, 95%, 53%);
  --deal-avoid: hsl(0, 72%, 51%);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'DM Sans', system-ui, sans-serif;
  background: var(--background);
  color: var(--foreground);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.mono {
  font-family: 'JetBrains Mono', monospace;
}

.header {
  border-bottom: 1px solid var(--border);
  background: hsla(0, 0%, 100%, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

@media (min-width: 640px) {
  .header-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.header-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--foreground);
  letter-spacing: -0.025em;
}

.header-subtitle {
  font-size: 0.75rem;
  color: var(--muted-foreground);
  margin-top: 0.125rem;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--muted-foreground);
  cursor: pointer;
}

.toggle-btn {
  position: relative;
  width: 2.5rem;
  height: 1.25rem;
  border-radius: 9999px;
  background: var(--border);
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}

.toggle-btn.active {
  background: var(--primary);
}

.toggle-knob {
  position: absolute;
  top: 0.125rem;
  left: 0.125rem;
  width: 1rem;
  height: 1rem;
  border-radius: 9999px;
  background: var(--primary-foreground);
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  transition: transform 0.2s;
}

.toggle-btn.active .toggle-knob {
  transform: translateX(1.25rem);
}

.reset-btn {
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted-foreground);
  cursor: pointer;
  transition: background 0.2s;
  font-family: inherit;
}

.reset-btn:hover {
  background: var(--secondary);
}

.main-grid {
  max-width: 72rem;
  margin: 0 auto;
  padding: 1.5rem 1rem;
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 1024px) {
  .main-grid {
    grid-template-columns: 1fr 380px;
  }
}

.left-col {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.right-col {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

@media (min-width: 1024px) {
  .right-col {
    position: sticky;
    top: 5rem;
    align-self: start;
  }
}

.card {
  border-radius: 0.75rem;
  border: 1px solid var(--border);
  background: var(--card);
  padding: 1.25rem;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.card-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--foreground);
  margin-bottom: 1rem;
}

.card-hint {
  font-size: 0.625rem;
  color: var(--muted-foreground);
  margin-bottom: 1rem;
}

.card-footer-hint {
  font-size: 0.625rem;
  color: var(--muted-foreground);
  margin-top: 0.75rem;
  font-style: italic;
}

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

@media (min-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.form-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted-foreground);
  margin-bottom: 0.375rem;
}

.form-select,
.form-input {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--card);
  padding: 0.625rem 0.75rem;
  font-size: 0.875rem;
  font-family: inherit;
  color: var(--foreground);
  outline: none;
  transition: box-shadow 0.2s;
}

.form-input.mono {
  font-family: 'JetBrains Mono', monospace;
}

.form-select:focus,
.form-input:focus {
  box-shadow: 0 0 0 2px var(--ring);
}

.form-hint {
  display: block;
  font-size: 0.625rem;
  color: var(--muted-foreground);
  margin-top: 0.125rem;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  cursor: pointer;
}

.feature-item input[type="checkbox"] {
  margin-top: 0.125rem;
  width: 1rem;
  height: 1rem;
  border-radius: 0.25rem;
  accent-color: var(--primary);
  cursor: pointer;
  flex-shrink: 0;
}

.feature-info {
  flex: 1;
  min-width: 0;
}

.feature-label {
  font-size: 0.875rem;
  color: var(--foreground);
}

.feature-label.missing {
  color: var(--deal-over);
  font-weight: 500;
}

.feature-deduction {
  display: block;
  font-size: 0.625rem;
  color: var(--deal-over);
}

.feature-note {
  display: block;
  font-size: 0.625rem;
  color: var(--muted-foreground);
  font-style: italic;
}

.model-notes {
  margin-top: 1rem;
  padding: 0.75rem;
  border-radius: var(--radius);
  background: var(--accent);
  border: 1px solid hsla(174, 62%, 22%, 0.1);
}

.model-notes p {
  font-size: 0.6875rem;
  color: var(--accent-foreground);
}

.summary-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.copy-btn {
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
  border-radius: var(--radius);
  border: none;
  background: var(--primary);
  color: var(--primary-foreground);
  cursor: pointer;
  font-weight: 500;
  font-family: inherit;
  transition: opacity 0.2s;
}

.copy-btn:hover {
  opacity: 0.9;
}

.summary-box {
  padding: 1rem;
  border-radius: var(--radius);
  background: var(--secondary);
  border: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--foreground);
  line-height: 1.6;
  white-space: pre-wrap;
}

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

@media (min-width: 640px) {
  .checklist-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.checklist-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--foreground);
}

.checklist-item input[type="checkbox"] {
  width: 0.875rem;
  height: 0.875rem;
  border-radius: 0.25rem;
  accent-color: var(--primary);
  cursor: pointer;
}

.verdict-card {
  border-radius: 0.75rem;
  border: 1px solid;
  padding: 1rem;
  text-align: center;
}

.verdict-label {
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted-foreground);
  margin-bottom: 0.25rem;
}

.verdict-value {
  font-size: 1.125rem;
  font-weight: 700;
}

.verdict-extra {
  font-size: 0.75rem;
  color: var(--deal-great);
  margin-top: 0.25rem;
  font-weight: 500;
}

.verdict-great { color: var(--deal-great); background: hsla(152, 60%, 40%, 0.1); border-color: hsla(152, 60%, 40%, 0.3); }
.verdict-fair { color: var(--deal-fair); background: hsla(174, 62%, 32%, 0.1); border-color: hsla(174, 62%, 32%, 0.3); }
.verdict-slight { color: var(--deal-slight); background: hsla(38, 92%, 50%, 0.1); border-color: hsla(38, 92%, 50%, 0.3); }
.verdict-over { color: var(--deal-over); background: hsla(25, 95%, 53%, 0.1); border-color: hsla(25, 95%, 53%, 0.3); }
.verdict-avoid { color: var(--deal-avoid); background: hsla(0, 72%, 51%, 0.1); border-color: hsla(0, 72%, 51%, 0.3); }

.price-rows,
.deduction-rows {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.deduction-rows {
  gap: 0.5rem;
  font-size: 0.75rem;
}

.price-row,
.deduct-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.price-label {
  font-size: 0.75rem;
  color: var(--muted-foreground);
}

.price-value {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--foreground);
}

.price-value.highlight {
  color: var(--primary);
  font-weight: 600;
}

.deduct-row {
  color: var(--muted-foreground);
}

.deduct-row .mono {
  font-weight: 500;
}

.deduct-row.total-row {
  font-weight: 600;
  color: var(--foreground);
  padding-top: 0.5rem;
}

.separator {
  border-top: 1px solid var(--border);
}

.text-great { color: var(--deal-great); }
.text-over { color: var(--deal-over); }
.text-muted { color: var(--muted-foreground); }

.footer {
  border-top: 1px solid var(--border);
  margin-top: 2rem;
  padding: 1rem;
  text-align: center;
  font-size: 0.625rem;
  color: var(--muted-foreground);
}

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--foreground);
  color: var(--background);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  z-index: 100;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Saved Calculations */
.saved-calcs-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.saved-empty {
  font-size: 0.75rem;
  color: var(--muted-foreground);
  font-style: italic;
  padding: 0.5rem 0;
}

.saved-calc-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 0.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--secondary);
  transition: background 0.15s;
}

.saved-calc-row:hover {
  background: var(--accent);
}

.saved-calc-info {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  flex: 1;
  min-width: 0;
}

.saved-calc-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--foreground);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.saved-calc-meta {
  font-size: 0.625rem;
  color: var(--muted-foreground);
}

.saved-calc-delete {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  border: none;
  background: transparent;
  color: var(--muted-foreground);
  font-size: 1rem;
  cursor: pointer;
  border-radius: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s, background 0.15s;
  margin-left: 0.5rem;
}

.saved-calc-delete:hover {
  color: var(--deal-avoid);
  background: hsla(0, 72%, 51%, 0.1);
}