:root {
  --bg: #14171c;
  --fg: #e6e8ec;
  --muted: #8a93a3;
  --card: #1c2027;
  --border: #2a2f38;
  --accent: #6ea8fe;
  --err: #e26d5a;
  --ok: #6cc06c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.45;
}

header, main, footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
}

header h1 { margin: 0 0 0.25rem 0; font-size: 1.6rem; }
header .sub { margin: 0; color: var(--muted); }
header a { color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}

.card.ok { border-color: var(--ok); }
.card.err { border-color: var(--err); }

.card h2 { margin-top: 0; font-size: 1.15rem; }

.muted { color: var(--muted); }
.err { color: var(--err); }

.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.6rem 1rem;
  align-items: end;
}

.grid label {
  display: flex;
  flex-direction: column;
  font-size: 0.85rem;
  color: var(--muted);
}

.grid label.span { grid-column: 1 / -1; }

.grid input, .grid select, .grid button {
  background: #0f1217;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.45rem 0.55rem;
  font-size: 0.95rem;
  font-family: inherit;
}

.grid button {
  background: var(--accent);
  color: #0b1220;
  font-weight: 600;
  cursor: pointer;
  border: 0;
}

.grid button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.output {
  background: #0b0e12;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.75rem;
  margin-top: 0.75rem;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.85rem;
  overflow-x: auto;
  white-space: pre;
  max-height: 60vh;
}

#matrix-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0.5rem 0 0.75rem 0;
}

#armor-slider { flex: 1; }
.armor-readout {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  min-width: 9ch;
  text-align: right;
}

.matrix {
  border-collapse: collapse;
  font-size: 0.8rem;
}

.matrix th, .matrix td {
  border: 1px solid var(--border);
  padding: 0.25rem 0.4rem;
  text-align: center;
  min-width: 2.5rem;
}

.matrix th {
  background: #0f1217;
  color: var(--muted);
  font-weight: 500;
  white-space: nowrap;
}

.matrix th.row-head { text-align: right; }
.matrix th.corner { font-size: 0.7rem; font-style: italic; }

.matrix td { color: #0b0e12; font-weight: 600; }

#matrix-container { overflow-x: auto; }

.matrix-pair {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: flex-start;
}

.matrix-block {
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
}

.matrix-block h3 {
  margin: 0 0 0.4rem 0;
  font-size: 0.95rem;
  color: var(--muted);
  font-weight: 500;
}

.mode-toggle {
  display: flex;
  gap: 1rem;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.mode-toggle label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
}

.era-divider {
  margin: 1.5rem 0 0.25rem 0;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 1.05rem;
  color: var(--fg);
}

footer { color: var(--muted); font-size: 0.85rem; }
footer a { color: var(--accent); }

@media (max-width: 720px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}