:root {
  --bg:#f4f5f6;
  --panel:#ffffff;
  --txt:#1f2933;
  --muted:#6b7280;
}
* { box-sizing:border-box; }
body {
  margin:0;
  min-height:100vh;
  background:var(--bg);
  font-family:Century Gothic,Avenir Next,Arial,sans-serif;
  color:var(--txt);
  display:grid;
  place-items:center;
}
.app {
  width:min(1180px,96vw);
  display:grid;
  grid-template-columns:1fr 390px;
  gap:24px;
  align-items:start;
  padding:24px 0;
}
.stage,.side {
  background:var(--panel);
  border-radius:24px;
  box-shadow:0 18px 45px rgba(31,41,51,.10);
}
.stage {
  padding:28px;
  display:grid;
  place-items:center;
}
.side { padding:20px; }
.preview-card {
  width:min(780px,82vw);
  min-height:520px;
  display:grid;
  place-items:center;
  position:relative;
}
.preview-image {
  width:100%;
  height:auto;
  display:block;
}
.preview-status {
  position:absolute;
  bottom:16px;
  left:50%;
  transform:translateX(-50%);
  font-size:12px;
  color:#6b7280;
  background:rgba(255,255,255,.86);
  padding:6px 10px;
  border-radius:999px;
}
.brand-logo {
  width:150px;
  display:block;
  margin:0 auto 16px;
}
h1 {
  font-size:18px;
  margin:0 0 6px;
}
p {
  font-size:13px;
  color:var(--muted);
  line-height:1.45;
  margin:0 0 14px;
}
label {
  display:block;
  font-size:12px;
  color:var(--muted);
  margin-top:12px;
}
input,select {
  width:100%;
  padding:10px 11px;
  border:1px solid #d8dde3;
  border-radius:10px;
  font:14px Century Gothic,Arial,sans-serif;
  margin-top:5px;
}
input[type="range"] { padding:0; }
button {
  width:100%;
  margin-top:20px;
  padding:13px;
  border:0;
  border-radius:12px;
  background:#1f2933;
  color:white;
  font-weight:700;
  cursor:pointer;
}
.mini {
  display:grid;
  grid-template-columns:1fr 54px;
  gap:10px;
  align-items:center;
}
.section-title {
  margin-top:18px;
  padding-top:14px;
  border-top:1px solid #e5e7eb;
  font-size:12px;
  font-weight:700;
  color:#374151;
}
.version {
  margin-top:12px;
  font-size:11px;
  color:#9ca3af;
  text-align:center;
}
@media (max-width:940px) {
  .app { grid-template-columns:1fr; }
}