:root {
  --bg-body: #0a0d14;
  --bg-card: #11161f;
  --bg-elevated: #161d2b;
  --bg-input: #1a2233;
  --bg-hover: #1f2840;
  --border: #262f42;
  --border-focus: #f59e0b;
  --text-primary: #e2e6ed;
  --text-secondary: #8891a3;
  --text-muted: #546074;
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --accent-glow: rgba(245, 158, 11, 0.12);
  --success: #34d399;
  --danger: #ef4444;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.2s ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg-body);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
}

input, select, button {
  font-family: inherit;
  font-size: inherit;
}

::selection {
  background: var(--accent);
  color: #000;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  font-size: 1.4rem;
  color: var(--accent);
  font-weight: 800;
  line-height: 1;
}

.logo-text {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo-text small {
  font-weight: 400;
  font-size: 0.7rem;
  color: var(--accent);
  margin-left: 1px;
}

.btn-icon {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.container {
  max-width: 520px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

h1 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 4px;
  margin-bottom: 24px;
}

.calc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.field label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.field-row {
  display: flex;
  gap: 12px;
}

.field-row .field {
  min-width: 0;
}

input, select {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 10px 12px;
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

input:focus, select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  opacity: 0.3;
}

input[type="number"]:hover::-webkit-inner-spin-button,
input[type="number"]:hover::-webkit-outer-spin-button {
  opacity: 0.6;
}

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238891a3' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

select option {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

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

.time-row, .weight-row {
  gap: 2px;
}

.input-unit {
  position: relative;
  flex: 1;
}

.input-unit input {
  padding-right: 32px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.input-unit .unit {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  pointer-events: none;
}

.sep {
  color: var(--text-muted);
  font-weight: 500;
  padding: 0 2px;
  font-size: 0.9rem;
}

.tax-field {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tax-field input[type="number"] {
  flex: 1;
  min-width: 0;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

.toggle input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-track {
  width: 36px;
  height: 20px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 10px;
  position: relative;
  transition: background var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: transform var(--transition), background var(--transition);
}

.toggle input:checked + .toggle-track {
  background: var(--accent);
  border-color: var(--accent);
}

.toggle input:checked + .toggle-track .toggle-thumb {
  transform: translateX(16px);
  background: #000;
}

.toggle-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.results {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  transition: opacity var(--transition), transform var(--transition);
}

.result-card.highlight {
  border-color: var(--accent);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.06), rgba(245, 158, 11, 0.02));
}

.result-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 4px;
}

.result-value {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.result-card.highlight .result-value {
  color: var(--accent);
}

.result-breakdown {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.breakdown-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.breakdown-item span:last-child {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
}

.result-meta {
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.empty-state {
  margin-top: 40px;
  text-align: center;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  opacity: 0.5;
}

.empty-state p {
  font-size: 0.9rem;
  line-height: 1.6;
}

.results.hidden,
.empty-state.hidden {
  display: none;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 50;
  transition: opacity 0.3s ease;
}

.overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 420px;
  background: var(--bg-elevated);
  border-left: 1px solid var(--border);
  z-index: 60;
  display: flex;
  flex-direction: column;
  transform: translateX(0);
  transition: transform 0.3s ease;
}

.settings-panel.hidden {
  transform: translateX(100%);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
}

.panel-header h2 {
  font-size: 1.1rem;
  font-weight: 700;
}

.panel-header .btn-icon {
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-muted);
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.settings-group h3 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 12px;
}

.settings-group .field + .field {
  margin-top: 10px;
}

.filament-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 10px;
}

.filament-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.filament-row input[type="text"] {
  flex: 0 0 auto;
  width: 110px;
}

.filament-row .money {
  flex: 1;
}

.filament-row .btn-icon {
  flex-shrink: 0;
  color: var(--danger);
  opacity: 0.5;
}

.filament-row .btn-icon:hover {
  opacity: 1;
  background: rgba(239, 68, 68, 0.1);
}

.btn-add {
  background: none;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  padding: 8px;
  width: 100%;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  transition: border-color var(--transition), color var(--transition);
}

.btn-add:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.panel-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-primary {
  background: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  color: #000;
  font-weight: 700;
  padding: 12px 20px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background var(--transition), transform var(--transition);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.io-buttons {
  display: flex;
  gap: 8px;
}

.btn-secondary {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  padding: 10px;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.btn-secondary:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

@media (max-width: 480px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .field-row {
    flex-direction: column;
  }

  .result-value {
    font-size: 1.3rem;
  }

  .settings-panel {
    max-width: 100%;
  }
}

@media (min-width: 768px) {
  .container {
    padding-top: 40px;
  }

  h1 {
    font-size: 1.6rem;
  }

  .results {
    flex-direction: row;
  }

  .result-card {
    flex: 1;
  }

  .result-value {
    font-size: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .calc-card {
    padding: 24px;
  }
}