:root {
  --bg: #000;
  --panel: rgba(20, 20, 20, 0.85);
  --txt: #00ff00;
  --txt-alt: #fff;
  --accent: #00ff00;
  --border: #00ff00;
  --font: 'VT323', monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  min-height: 100vh;
  background: var(--bg);
  color: var(--txt);
  font-family: var(--font);
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
}

header {
  background: var(--panel);
  padding: 12px 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-bottom: 2px solid var(--border);
}

#title {
  font-size: clamp(24px, 8vw, 48px);
  letter-spacing: 4px;
  text-shadow: 0 0 8px var(--accent);
  animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
  from {
    text-shadow: 0 0 8px var(--accent);
  }
  to {
    text-shadow: 0 0 16px var(--accent), 0 0 24px var(--accent);
  }
}

main {
  min-height: 0;
  display: grid;
  place-items: center;
  padding: 20px 16px;
}

#appShell {
  width: min(100%, 1120px);
  min-height: 0;
  height: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
  align-items: center;
  gap: 24px;
}

#asciiWrapper {
  width: 100%;
  height: min(100%, 72vh);
  min-height: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
}

#asciiViewport {
  width: min(100%, 720px);
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  padding: clamp(12px, 2vw, 24px);
  border: 2px solid rgba(0, 255, 0, 0.65);
  background:
    radial-gradient(circle at top, rgba(0, 255, 0, 0.08), transparent 55%),
    linear-gradient(180deg, rgba(0, 255, 0, 0.05), rgba(0, 0, 0, 0.45));
  box-shadow:
    inset 0 0 24px rgba(0, 255, 0, 0.12),
    0 0 30px rgba(0, 255, 0, 0.14);
  overflow: hidden;
  cursor: zoom-in;
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
}

#asciiViewport:hover {
  border-color: rgba(255, 255, 255, 0.85);
  box-shadow:
    inset 0 0 24px rgba(0, 255, 0, 0.12),
    0 0 36px rgba(0, 255, 0, 0.24);
}

#asciiViewport:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 4px;
}

#asciiViewport:-webkit-full-screen,
#asciiViewport:fullscreen {
  width: 100vw;
  height: 100vh;
  aspect-ratio: auto;
  padding: clamp(16px, 3vw, 40px);
  border: none;
  box-shadow: none;
  background:
    radial-gradient(circle at top, rgba(0, 255, 0, 0.12), transparent 58%),
    #000;
  cursor: zoom-out;
}

#asciiViewport:-webkit-full-screen #ascii,
#asciiViewport:fullscreen #ascii {
  max-width: 100%;
  max-height: 100%;
}

#ascii {
  white-space: pre;
  user-select: none;
  line-height: 1;
  text-shadow: 0 0 3px currentColor;
  font-family: var(--font);
  color: var(--txt);
  animation: flicker-text 0.18s infinite;
  display: none;
  transform: translateZ(0);
  margin: 0 auto;
}

#ascii.active {
  display: inline-block;
}

@keyframes flicker-text {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.97;
  }
}

@keyframes glitch {
  0% {
    transform: translate(0);
  }
  20% {
    transform: translate(-1px, 1px);
  }
  40% {
    transform: translate(-1px, -1px);
  }
  60% {
    transform: translate(1px, 1px);
  }
  80% {
    transform: translate(1px, -1px);
  }
  100% {
    transform: translate(0);
  }
}

#controls {
  width: 100%;
  background: var(--panel);
  border: 2px solid var(--border);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 0 20px rgba(0, 255, 0, 0.3);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-label {
  font-size: 18px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
}

.range-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.value-display {
  font-size: 20px;
  min-width: 32px;
  text-align: right;
  color: var(--txt-alt);
}

.res-buttons {
  display: flex;
  gap: 8px;
  width: 100%;
}

.res-btn {
  flex: 1;
  padding: 12px 16px;
  font-size: 16px;
  background: #111;
  border: 2px solid var(--border);
  color: var(--txt);
  transition: all 0.2s;
}

.res-btn:hover {
  background: #1a1a1a;
  box-shadow: 0 0 10px rgba(0, 255, 0, 0.3);
}

.res-btn.active {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
  box-shadow: 0 0 15px var(--accent);
  font-weight: bold;
}

.control-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.slider {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
  background: transparent;
}

.btn {
  background: var(--bg);
  border: 2px solid var(--border);
  color: var(--accent);
  padding: 12px 20px;
  font-size: 18px;
  font-family: var(--font);
  letter-spacing: 2px;
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
  box-shadow: 0 0 10px rgba(0, 255, 0, 0.2);
}

.btn:hover {
  background: var(--accent);
  color: var(--bg);
  box-shadow: 0 0 20px var(--accent);
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.start-btn {
  width: 100%;
  font-size: 22px;
  padding: 16px;
  display: block;
}

.start-btn.visible {
  display: block;
}

video {
  position: absolute;
  top: -10000px;
  left: -10000px;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

#exportCanvas {
  display: none;
}

footer {
  background: var(--panel);
  text-align: center;
  padding: 12px 8px;
  font-size: 18px;
  border-top: 2px solid var(--border);
}

footer a {
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 1px;
  transition: all 0.2s;
}

footer a:hover {
  text-shadow: 0 0 8px var(--accent);
}

body.is-fullscreen header,
body.is-fullscreen footer,
body.is-fullscreen #controls {
  display: none;
}

body.is-fullscreen main {
  padding: 0;
}

body.is-fullscreen #appShell {
  width: 100%;
  height: 100%;
  display: block;
}

body.is-fullscreen #asciiWrapper {
  height: 100vh;
}

@media (max-width: 900px) {
  html,
  body {
    overflow: auto;
  }

  main {
    place-items: start center;
    padding: 12px 8px;
  }

  #appShell {
    height: auto;
    grid-template-columns: 1fr;
    align-items: start;
    gap: 16px;
  }

  #asciiWrapper {
    height: auto;
  }

  #asciiViewport {
    width: min(100%, 760px);
  }

  #controls {
    padding: 12px;
  }
}

@media (max-width: 600px) {
  .btn {
    font-size: 16px;
    padding: 10px 16px;
  }

  #title {
    font-size: clamp(20px, 8vw, 32px);
    letter-spacing: 2px;
  }
}

@media (max-width: 400px) {
  #controls {
    padding: 10px;
  }

  .control-label,
  .value-display {
    font-size: 16px;
  }
}