:root {
  --bg: #0f1320;
  --card: #171b2e;
  --text: #e8ecff;
  --accent: #8aa2ff;
  --muted: #9aa3b2;
  --border: #2a3150;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 800px at 20% 10%, #121634, #0b0e1c);
  color: var(--text);
}

.container {
  max-width: 1100px;
  margin: 32px auto;
  padding: 0 16px;
}

header h1 { margin: 0 0 8px; }
header p { margin: 0 0 20px; color: var(--muted); }

.controls, .preview {
  background: linear-gradient(180deg, #141933, #101427);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,.3);
}

.controls { margin-bottom: 20px; }

.uploader {
  position: relative;
  border: 2px dashed #2f3763;
  border-radius: 12px;
  padding: 24px;
  text-align: center;
  color: var(--muted);
  transition: border-color .2s, background .2s;
  cursor: pointer;
}
.uploader:hover { border-color: var(--accent); background: #111735; }
.uploader input[type="file"] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer;
}

.row {
  margin-top: 12px;
  display: flex; align-items: center; gap: 12px;
}
label { color: var(--text); }
select { padding: 8px 10px; border-radius: 8px; background: #0e1430; color: var(--text); border: 1px solid var(--border); }
.checkbox { display: flex; align-items: center; gap: 10px; color: var(--muted); }

button#submitBtn {
  margin-top: 14px;
  background: linear-gradient(135deg, #5b74ff, #7f9fff);
  color: #0a0f25;
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-weight: 700;
  cursor: pointer;
}
button#submitBtn:hover { filter: brightness(1.05); }

.preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.preview h3 { margin-top: 0; }
#previewImg, #resultBox img {
  width: 100%;
  max-height: 60vh;
  object-fit: contain;
  background: #0b0f24;
  border: 1px solid var(--border);
  border-radius: 10px;
}
#info { color: var(--muted); margin-top: 6px; font-size: 0.95rem; }

#resultBox a.download {
  display: inline-block;
  margin-top: 10px;
  padding: 10px 14px;
  background: #242c57;
  border: 1px solid var(--border);
  color: #dfe6ff;
  border-radius: 8px;
  text-decoration: none;
}
#resultBox a.download:hover { background: #2b356b; }

footer { margin-top: 18px; color: var(--muted); text-align: center; }
@media (max-width: 820px) { .preview { grid-template-columns: 1fr; } }

/* Compare block */
.compare { position: relative; overflow: hidden; border: 1px solid #252941; border-radius: 12px; }

/* Stack BOTH images on top of each other */
.compare img {
  position: absolute;     /* <— important */
  top: 0; left: 0;
  width: 100%;
  height: auto;
  transform-origin: top left;
}

/* Divider stays on top */
#cmpDivider { position: absolute; top: 0; bottom: 0; width: 2px; background: #6aa7ff; box-shadow: 0 0 0 2px rgba(106,167,255,.25); pointer-events: none; }