/* Inter font (self-hosted) */
@font-face {
  font-family: 'Inter';
  src: url('fonts/inter.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* Custom properties */
:root {
  --color-accent: #FF6900;
  --color-text: #32373C;
  --color-bg: #ffffff;
  --color-border: #dde1e6;
  --color-muted: #6b7280;
  --radius: 6px;
  --spacing: 1.5rem;
}

/* Reset & base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* Header */
header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.logo {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.tool-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text);
}

/* Main layout: two columns */
main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

#comparison-table {
  grid-column: 1;
}

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

/* Fieldsets */
fieldset {
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1rem 1.25rem;
}

legend {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
  padding: 0 0.25rem;
}

/* Input row: W x H side by side */
.input-row {
  display: flex;
  gap: 1rem;
}

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

.input-row label span {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-muted);
}

.input-row input[type="number"] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.15s, box-shadow 0.15s;
  -moz-appearance: textfield;
  appearance: textfield;
}

.input-row input[type="number"]::-webkit-inner-spin-button,
.input-row input[type="number"]::-webkit-outer-spin-button {
  opacity: 1;
}

.input-row input[type="number"]:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255, 105, 0, 0.12);
}

.input-row select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.15s, box-shadow 0.15s;
  cursor: pointer;
}

.input-row select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255, 105, 0, 0.12);
}

/* SVG column */
.svg-column {
  position: sticky;
  top: 2rem;
}

#svg-container {
  display: none;
  width: 100%;
}

#svg-container svg {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}

#svg-container.visible {
  display: block;
}

/* Zero state */
#zero-state {
  display: none;
  padding: 2rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.95rem;
  background: #f9fafb;
  border: 1.5px dashed var(--color-border);
  border-radius: var(--radius);
  min-height: 200px;
  align-items: center;
  justify-content: center;
}

#zero-state.visible {
  display: flex;
}

#zero-state.error {
  color: #b91c1c;
  background: #fef2f2;
  border-color: #fecaca;
}

/* SVG element classes */
.sheet {
  fill: #fff;
  stroke: #32373C;
  stroke-width: 4;
}

.margin-boundary {
  fill: none;
  stroke: #aaa;
  stroke-width: 3;
  stroke-dasharray: 15 10;
}

.die {
  fill: #e8f0fe;
  stroke: #6b8dd6;
  stroke-width: 3;
  shape-rendering: crispEdges;
}

/* Comparison table */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.comparison-table th {
  text-align: left;
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
  border-bottom: 1.5px solid var(--color-border);
}

.comparison-table td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table tbody tr {
  cursor: pointer;
  transition: background-color 0.1s;
}

.comparison-table tbody tr:not(.best-row):not(.selected-row):hover {
  background-color: #f9fafb;
}

.comparison-table tr.best-row {
  background-color: rgba(255, 105, 0, 0.08);
}

.comparison-table tr.selected-row {
  background-color: #f3f4f6;
}

.nejlepsi-badge {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.1em 0.45em;
  font-size: 0.7rem;
  font-weight: 600;
  background: var(--color-accent);
  color: #fff;
  border-radius: 999px;
  vertical-align: middle;
  letter-spacing: 0.03em;
}

/* Table empty/zero states */
.table-zero-state {
  padding: 2rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.95rem;
  background: #f9fafb;
  border: 1.5px dashed var(--color-border);
  border-radius: var(--radius);
}

.table-zero-state.error {
  color: #b91c1c;
  background: #fef2f2;
  border-color: #fecaca;
}

/* Responsive: single column on mobile */
@media (max-width: 768px) {
  body {
    padding: 1.25rem;
  }

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

  .svg-column {
    position: static;
    order: 2;
  }

  .inputs-column {
    order: 1;
  }

  #comparison-table {
    order: 3;
  }
}