:root {
  --color-bg: #000b29;
  --color-surface: #0a1638;
  --color-surface-alt: #10204a;
  --color-border: #24325c;
  --color-text: #ffffff;
  --color-text-muted: #bfc2ca;
  --color-accent: #f95954;
  --color-accent-dark: #d6413c;
  --color-positive: #4ade80;
  --color-negative: #f87171;
  --color-info: #8fb8e8;
  --radius: 10px;
  --wrap-width: 1080px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: "Roboto", system-ui, -apple-system, Arial, sans-serif;
  font-weight: 300;
  line-height: 1.5;
}

h1, h2, h3, .panel-title, .headline-value, .brand {
  font-family: "Roboto", system-ui, -apple-system, Arial, sans-serif;
  font-weight: 700;
}

.wrap {
  max-width: var(--wrap-width);
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 18px 0;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  text-decoration: none;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
}

.brand-mark {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.back-link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.back-link:hover {
  color: var(--color-text);
}

.intro {
  padding: 48px 0 32px;
  max-width: 640px;
}

.intro h1 {
  font-size: 2rem;
  margin: 0 0 12px;
}

.intro p {
  color: var(--color-text-muted);
  margin: 0;
}

.calculator-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
  align-items: start;
  padding-bottom: 48px;
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
}

.panel-title {
  margin: 0 0 20px;
  font-size: 1.1rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.field-group {
  border: none;
  padding: 0;
  margin: 0 0 20px;
}

.field-group legend {
  padding: 0 0 8px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.toggle-row {
  display: flex;
  gap: 8px;
  background: var(--color-surface-alt);
  border-radius: var(--radius);
  padding: 4px;
}

.toggle-option {
  flex: 1;
  text-align: center;
  padding: 8px 12px;
  border-radius: calc(var(--radius) - 4px);
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.toggle-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.toggle-option:has(input:checked) {
  background: var(--color-accent);
  color: #1a1206;
  font-weight: 600;
}

.field {
  margin: 0 0 20px;
}

.field-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 0 0 20px;
}

.field-pair .field {
  margin-bottom: 0;
}

.field label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.live-val {
  color: var(--color-accent);
  font-weight: 600;
}

.field input[type="number"],
.field input[type="text"].field-input {
  width: 100%;
  padding: 10px 12px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-size: 1rem;
}

.field input[type="number"]:focus,
.field input[type="text"].field-input:focus,
.field input[type="range"]:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.input-prefix {
  position: relative;
}

.input-prefix .prefix-symbol {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
  font-size: 1rem;
  z-index: 1;
}

.field input[type="text"].currency-input {
  padding-left: 26px;
}

.field input[type="range"] {
  width: 100%;
  accent-color: var(--color-accent);
}

.field-hint {
  margin: 8px 0 0;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.hidden {
  display: none;
}

.results-panel {
  position: sticky;
  top: 24px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

.result-row:last-of-type {
  border-bottom: none;
}

.result-label {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.result-value {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.result-sub {
  font-size: 0.85em;
  font-weight: 600;
}

.result-sub.negative {
  color: var(--color-negative);
}

.result-sub.positive {
  color: var(--color-positive);
}

.info-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  margin-left: 6px;
  border-radius: 50%;
  border: 1px solid var(--color-info);
  color: var(--color-info);
  opacity: 0.55;
  background: transparent;
  padding: 0;
  font-family: "Roboto", system-ui, -apple-system, Arial, sans-serif;
  font-size: 10px;
  font-weight: 700;
  line-height: 1;
  cursor: help;
  position: relative;
  vertical-align: middle;
  transition: opacity 0.15s ease;
}

.info-icon:hover,
.info-icon:focus-visible {
  opacity: 1;
  outline: none;
}

.info-icon::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  width: max-content;
  max-width: 220px;
  padding: 8px 10px;
  border-radius: 6px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 0.75rem;
  font-weight: 300;
  line-height: 1.4;
  text-align: left;
  white-space: normal;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s ease;
  z-index: 20;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
  pointer-events: none;
}

.info-icon:hover::before,
.info-icon:focus-visible::before {
  opacity: 1;
  visibility: visible;
}

.headline-results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 20px;
}

.headline-stat {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}

.headline-label {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.headline-value {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.headline-value.negative {
  color: var(--color-negative);
}

.headline-value.positive {
  color: var(--color-positive);
}

.cta {
  text-align: center;
  padding: 32px 0 56px;
  border-top: 1px solid var(--color-border);
}

.cta h2 {
  font-size: 1.3rem;
  margin: 0 0 12px;
}

.cta a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
}

.cta a:hover {
  color: var(--color-accent-dark);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 20px 0;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

@media (max-width: 800px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .results-panel {
    position: static;
  }

  .field-pair {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .field-pair .field {
    margin-bottom: 20px;
  }

  .header-inner {
    flex-wrap: wrap;
    gap: 8px;
  }

  .brand {
    font-size: 1rem;
  }
}