/* Bedstead by Ben Harris, public domain: https://bjh21.me.uk/bedstead/
   Its em is 10 pixel rows, so font-size = cell height; the extended cut is 0.75em wide. */
@font-face {
  font-family: 'Bedstead';
  src: url('/fonts/bedstead-extended.otf') format('opentype');
  font-display: block;
}

:root {
  --black: #000;
  --red: #f00;
  --green: #0f0;
  --yellow: #ff0;
  --blue: #00f;
  --magenta: #f0f;
  --cyan: #0ff;
  --white: #fff;
  --cw: 20px;   /* character cell, 40x25 on a 4:3 screen */
  --ch: 24px;
  --gap: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: #15120f;
  color: #ddd;
  font-family: system-ui, sans-serif;
}

main {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  align-content: center;
  justify-content: center;
  min-height: 100vh;
  padding: 16px;
}

.tv {
  background: linear-gradient(160deg, #3a332c, #1f1a16);
  border-radius: 28px;
  padding: 22px;
  box-shadow: 0 20px 60px #000a, inset 0 1px 0 #fff2;
}

.glass {
  position: relative;
  width: calc(var(--cw) * 40 + 2 * var(--gap));
  height: calc(var(--ch) * 25 + 2 * var(--gap));
  background: #000;
  border-radius: 18px / 22px;
  overflow: hidden;
}

/* Scanlines and vignette; S toggles them off. */
.glass::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(to bottom, #0000 0 2px, #0002 2px 3px),
    radial-gradient(ellipse at center, #0000 60%, #0008 100%);
}
.glass.flat::after { display: none; }

.screen {
  position: absolute;
  left: var(--gap);
  top: var(--gap);
  width: calc(var(--cw) * 40);
  height: calc(var(--ch) * 25);
  font-family: 'Bedstead', monospace;
  font-size: var(--ch);
  line-height: var(--ch);
  user-select: none;
}

.row { display: flex; height: var(--ch); }
.row.dh { height: calc(var(--ch) * 2); }
.row.hidden { display: none; }

.cell {
  position: relative;
  width: var(--cw);
  height: 100%;
  text-align: center;
  white-space: pre;
  overflow: hidden;
}
.cell > span { display: inline-block; }
.row.dh .cell > span { transform: scaleY(2); transform-origin: 50% 0; }
.cell.link { cursor: pointer; }
.row:has(.link:hover) .link { text-decoration: underline; }

.mosaic {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr 1fr;
}

.fg-black { color: var(--black); } .bg-black { background: var(--black); }
.fg-red { color: var(--red); } .bg-red { background: var(--red); }
.fg-green { color: var(--green); } .bg-green { background: var(--green); }
.fg-yellow { color: var(--yellow); } .bg-yellow { background: var(--yellow); }
.fg-blue { color: var(--blue); } .bg-blue { background: var(--blue); }
.fg-magenta { color: var(--magenta); } .bg-magenta { background: var(--magenta); }
.fg-cyan { color: var(--cyan); } .bg-cyan { background: var(--cyan); }
.fg-white { color: var(--white); } .bg-white { background: var(--white); }

/* Live TV picture behind the teletext. Widescreen streams letterbox on the 4:3 glass. */
.picture { position: absolute; inset: 0; visibility: hidden; }
.picture iframe { width: 100%; height: 100%; border: 0; pointer-events: none; }
.screen-fill { position: absolute; inset: 0; width: 100%; height: 100%; }
.screen-fill[hidden] { display: none; }
.nosignal {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  padding: calc(var(--ch) * 0.4) calc(var(--cw) * 1.5);
  font-family: 'Bedstead', monospace;
  font-size: calc(var(--ch) * 1.5);
  line-height: 1;
  color: var(--white);
  background: #000;
}
.nosignal[hidden] { display: none; }
.glass[data-mode="tv"] .picture,
.glass[data-mode="mix"] .picture { visibility: visible; }
.glass[data-mode="tv"] .screen { visibility: hidden; }
/* MIX: black backgrounds turn see-through; coloured bands stay solid. */
.glass[data-mode="mix"] .screen .bg-black { background: transparent; }

/* Channel number, top left, as old sets drew it. */
.osd {
  position: absolute;
  z-index: 3;
  top: calc(var(--gap) + var(--ch));
  left: calc(var(--gap) + var(--cw) * 2);
  font-family: 'Bedstead', monospace;
  font-size: calc(var(--ch) * 1.5);
  line-height: 1;
  color: var(--green);
  text-shadow: 2px 2px 0 #000;
  pointer-events: none;
}
.osd[hidden] { display: none; }

/* Full-size comic over the screen */
.full {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  align-items: safe center;
  overflow: auto;
  background: #000;
  cursor: zoom-out;
}
.full[hidden] { display: none; }
.full img { display: block; width: 100%; height: auto; margin: auto; background: #fff; }

/* Remote control */
.remote {
  width: 210px;
  background: linear-gradient(#2b2b2e, #1b1b1d);
  border-radius: 40px 40px 26px 26px;
  padding: 26px 20px 20px;
  display: grid;
  gap: 16px;
  box-shadow: 0 14px 40px #000a, inset 0 1px 0 #fff2;
}
.remote button {
  font: 600 15px system-ui, sans-serif;
  color: #eee;
  background: #3d3d42;
  border: 0;
  border-radius: 10px;
  padding: 10px 0;
  cursor: pointer;
  box-shadow: 0 2px 0 #000;
}
.remote button:active { transform: translateY(1px); box-shadow: none; }
.remote button.on { background: #b33; }
.pad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.fast { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.fast button { height: 22px; padding: 0; border-radius: 6px; }
.fast .red { background: #d22; } .fast .green { background: #2b2; }
.fast .yellow { background: #dd2; } .fast .cyan { background: #2cc; }
.misc { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.modes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.modes button { font-size: 12px; }
.misc button { font-size: 12px; }
.modes button.on { background: #2b6; color: #000; }
.help { margin: 0; font-size: 11px; line-height: 1.4; color: #999; text-align: center; }

@media (max-width: 700px) {
  main { gap: 16px; padding: 16px 16px 24px; align-content: start; }
  .tv { padding: 10px; border-radius: 16px; }
  .remote { width: 100%; max-width: 360px; border-radius: 22px; padding: 18px; }
}