/* Shared look for TV and phone: brass and soot under gaslight. */
:root {
  --soot-900: #0d1416;
  --soot-800: #142024;
  --soot-700: #1d2e33;
  --soot-600: #2b4248;
  --brass-300: #f0d48a;
  --brass-400: #d9b25a;
  --brass-500: #b88a34;
  --brass-700: #6e5120;
  --copper-400: #d1794a;
  --copper-600: #8f4a2a;
  --gas-glow: #ffb648;
  --steam: #dfe9ea;
  --verdigris: #4fb39a;
  --danger: #e2553f;
  --ink: #f4ead2;
  --ink-dim: #a9a08a;

  --font-display: 'Playfair Display', 'Bodoni MT', Didot, 'Bookman Old Style', Georgia, serif;
  --font-body: Georgia, 'Iowan Old Style', 'Palatino Linotype', serif;
  --font-mono: ui-monospace, 'DejaVu Sans Mono', Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  background: var(--soot-900);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-tap-highlight-color: transparent;
}

.display {
  font-family: var(--font-display);
  letter-spacing: 0.04em;
}

/* Riveted brass plate, the basic panel. */
.plate {
  background: linear-gradient(160deg, var(--soot-700), var(--soot-800));
  border: 2px solid var(--brass-700);
  border-radius: 10px;
  box-shadow:
    inset 0 1px 0 rgb(255 255 255 / 0.06),
    0 4px 14px rgb(0 0 0 / 0.5);
}

.btn {
  font: inherit;
  font-family: var(--font-display);
  font-weight: 700;
  color: #2a1c05;
  background: linear-gradient(180deg, var(--brass-300), var(--brass-500));
  border: 2px solid var(--brass-700);
  border-radius: 10px;
  padding: 0.7em 1.2em;
  box-shadow:
    inset 0 1px 0 rgb(255 255 255 / 0.5),
    0 3px 0 var(--brass-700);
  touch-action: manipulation;
  user-select: none;
}

.btn:active {
  transform: translateY(2px);
  box-shadow: inset 0 1px 0 rgb(255 255 255 / 0.5), 0 1px 0 var(--brass-700);
}

.btn:disabled {
  filter: grayscale(0.7) brightness(0.7);
}