:root {
  --max-width: 920px;
  --accent: #2563eb;
  --bg1: #35a1a8;
  --bg2: #336cb2;
}

html, body {
  height: 100%;
  margin: 0;
  font-family: Inter, -apple-system, Segoe UI, Roboto, Helvetica, Arial, 'Noto Sans', sans-serif;
  color: #e6eef8;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px;
  box-sizing: border-box;
  background: linear-gradient(135deg, var(--bg1), var(--bg2));
  background-size: 200% 200%;
  animation: gradientMove 30s ease infinite;
}

@keyframes gradientMove {
  0% { background-position: 0% 0%; }
  50% { background-position: 100% 100%; }
  100% { background-position: 0% 0%; }
}

.frame {
  width: 100%;
  max-width: var(--max-width);
  background: rgba(8, 10, 12, 0.72);
  backdrop-filter: blur(6px);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 6px 30px rgba(2, 6, 23, 0.6);
}

header {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
}

.brand .logo {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

.controls button {
  padding: 8px 12px;
  border-radius: 8px;
  border: 0;
  background: var(--accent);
  color: white;
  cursor: pointer;
}

.content-wrapper {
  display: flex;
  gap: 20px;
  width: 100%;
}

main {
  flex: 1;
  background: transparent;
}

#content {
  padding: 14px 6px;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius: 8px;
  overflow: auto;
}

aside#guide {
  width: 250px;
  max-width: 30%;
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(6px);
  padding: 12px;
  border-radius: 8px;
  overflow: auto;
}

#content img.responsive,
#guide img.responsive {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

.nav {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 12px;
}

.muted {
  color: rgba(230, 238, 248, 0.66);
  font-size: 13px;
}

footer {
  margin-top: 12px;
  text-align: center;
  font-size: 13px;
  color: rgba(230, 238, 248, 0.6);
}

pre {
  position: relative;
  background: rgba(0,0,0,0.36);
  padding: 10px;
  border-radius: 8px;
  overflow: auto;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 8px;
  font-size: 12px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

@media (max-width: 1024px) {
  .content-wrapper {
    flex-direction: column;
  }
  aside#guide {
    width: 100%;
    max-width: 100%;
    margin-top: 12px;
  }
}

/* Dark/Light mode */
body.light {
  color: #222;
  background: linear-gradient(135deg, var(--bg1), var(--bg2));
}

body.light .frame {
  background: rgba(255, 255, 255, 0.85);
  color: #222;
}

body.light .muted,
body.light footer {
  color: rgba(34, 34, 34, 0.66);
}