@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600;700&display=swap');

:root {
  --background: 160 10% 6%;
  --foreground: 120 60% 75%;
  --card: 160 10% 9%;
  --primary: 120 100% 50%;
  --primary-foreground: 160 10% 6%;
  --muted-foreground: 120 15% 45%;
  --destructive: 0 72% 51%;
  --border: 120 30% 20%;
  --input: 120 20% 16%;
  --radius: 0.25rem;
  --tactical-glow: 0 0 20px hsl(120 100% 50% / 0.15);
  --tactical-border-glow: 0 0 6px hsl(120 100% 50% / 0.3);
}

* {
  box-sizing: border-box;
  border-color: hsl(var(--border));
}

body {
  margin: 0;
  background: hsl(var(--background));
  color: hsl(var(--foreground));
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    hsl(120 100% 50% / 0.03) 2px,
    hsl(120 100% 50% / 0.03) 4px
  );
  min-height: 100vh;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

header.app-header {
  text-align: center;
  margin-bottom: 2rem;
}

.title-box {
  display: inline-block;
  border: 1px solid hsl(var(--border));
  padding: 0.75rem 1.5rem;
  box-shadow: var(--tactical-glow);
}

.title-box h1 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: hsl(var(--primary));
}

.subtitle {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground));
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

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

section.panel {
  border: 1px solid hsl(var(--border));
  padding: 1rem;
  background: hsl(var(--card));
}

section.panel.results {
  border-color: hsl(var(--primary) / 0.5);
  box-shadow: var(--tactical-glow);
}

.panel h2 {
  margin: 0 0 1rem;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: hsl(var(--muted-foreground));
  border-bottom: 1px solid hsl(var(--border));
  padding-bottom: 0.5rem;
  font-weight: 500;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
}

label {
  display: block;
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground));
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.caliber-row {
  display: flex;
  gap: 0.5rem;
}

button.caliber-btn {
  flex: 1;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-family: inherit;
  background: transparent;
  border: 1px solid hsl(var(--border));
  color: hsl(var(--muted-foreground));
  cursor: pointer;
  transition: all 0.15s;
}

button.caliber-btn:hover {
  border-color: hsl(var(--muted-foreground));
}

button.caliber-btn.active {
  border-color: hsl(var(--primary));
  background: hsl(var(--primary) / 0.1);
  color: hsl(var(--primary));
  box-shadow: var(--tactical-border-glow);
}

select, input[type="number"] {
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-family: inherit;
  background: hsl(var(--input));
  border: 1px solid hsl(var(--border));
  color: hsl(var(--foreground));
}

select:focus, input[type="number"]:focus {
  outline: none;
  border-color: hsl(var(--primary));
}

select:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.hint {
  font-size: 0.625rem;
  color: hsl(var(--muted-foreground) / 0.6);
  margin-top: 0.25rem;
}

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

.results-grid.single {
  grid-template-columns: 1fr;
}

.result-box {
  border: 1px solid hsl(var(--border));
  padding: 1rem;
  text-align: center;
}

.result-label {
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground));
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.result-value {
  font-size: 1.875rem;
  font-weight: 700;
  color: hsl(var(--primary));
}

.result-unit {
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground));
  margin-top: 0.25rem;
}

.viz-wrap {
  position: relative;
}

.viz-svg {
  width: 100%;
  margin: 0 auto;
  display: block;
}

.breakdown {
  border: 1px solid hsl(var(--border));
  padding: 0.75rem;
  background: hsl(var(--card) / 0.5);
  font-size: 0.75rem;
  margin-top: 1rem;
}

.breakdown-title {
  color: hsl(var(--muted-foreground));
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.625rem;
  margin-bottom: 0.5rem;
}

.breakdown-row {
  color: hsl(var(--muted-foreground));
  margin-top: 0.25rem;
}

.breakdown-value {
  color: hsl(var(--foreground));
  font-weight: 700;
}

.breakdown-dim {
  color: hsl(var(--muted-foreground) / 0.7);
}

.disclaimer {
  border: 1px solid hsl(var(--destructive) / 0.4);
  background: hsl(var(--destructive) / 0.08);
  color: hsl(var(--foreground));
  padding: 0.75rem 1rem;
  font-size: 0.6875rem;
  line-height: 1.5;
}

.disclaimer strong {
  color: hsl(var(--destructive));
}

footer.app-footer {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground) / 0.5);
  letter-spacing: 0.05em;
}

@media (max-width: 480px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }
}