:root {
  --bg: #111217;
  --panel: #1b1e27;
  --line: #32374a;
  --fg: #e6e9ef;
  --accent: #e60012;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--fg);
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  background: radial-gradient(circle at 20% 0%, #232838 0, var(--bg) 45%);
}

.layout {
  width: min(1200px, 96vw);
  margin: 1rem auto 2rem;
  display: grid;
  gap: 1rem;
}

.topbar {
  border: 1px solid var(--line);
  background: #191c25;
  padding: 0.8rem 1rem;
}

.topbar h1 {
  margin: 0;
  font-size: clamp(1.1rem, 2.6vw, 1.5rem);
}

.topbar p { margin: 0.35rem 0 0; color: #b5bccd; }

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

button, .file-btn {
  border: 1px solid #5a6075;
  background: #252a38;
  color: var(--fg);
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  border-radius: 6px;
  font-weight: 600;
}

button:hover, .file-btn:hover { border-color: #a6aec7; }

#romInput { display: none; }

.screen-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 1rem;
}

.screen-frame {
  border: 12px solid #0b0c11;
  background: #000;
  box-shadow: 0 0 0 2px #3a3f52, 0 20px 40px rgba(0,0,0,.4);
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  padding: 1rem;
}

#screen {
  width: min(100%, 900px);
  height: auto;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: #000;
}

.panel {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 0.8rem 1rem;
}

.panel h2 {
  margin: 0.2rem 0 0.4rem;
  color: #f4f6ff;
  font-size: 1rem;
}

.panel p, .panel li { color: #c4cade; font-size: 0.92rem; }

.panel ul { margin: 0.2rem 0 0.8rem 1.2rem; padding: 0; }

code {
  background: #2b3041;
  border: 1px solid #4f5670;
  border-radius: 4px;
  padding: 0.05rem 0.3rem;
}

@media (max-width: 980px) {
  .screen-wrap {
    grid-template-columns: 1fr;
  }
}