:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #050507;
  color: #fff;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 14% 16%, rgba(0, 224, 255, .15), transparent 24rem),
    radial-gradient(circle at 88% 12%, rgba(255, 0, 174, .15), transparent 26rem),
    radial-gradient(circle at 50% 100%, rgba(183, 255, 0, .1), transparent 30rem),
    #050507;
}

button, input { font: inherit; }

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 64px;
}

.intro { max-width: 720px; margin-bottom: 28px; }
.eyebrow {
  margin: 0 0 10px;
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .18em;
  color: #7ef9ff;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 7vw, 5.8rem);
  line-height: .92;
  letter-spacing: -.055em;
}

.intro > p:last-child {
  max-width: 620px;
  margin: 20px 0 0;
  color: #c9c9d2;
  font-size: 1.05rem;
  line-height: 1.65;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px;
  align-items: start;
}

.preview-card, .controls {
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(15,15,20,.78);
  box-shadow: 0 24px 80px rgba(0,0,0,.38);
  backdrop-filter: blur(18px);
}

.preview-card { border-radius: 24px; padding: 16px; }
.canvas-wrap {
  position: relative;
  overflow: hidden;
  border-radius: 16px;
  background: #000;
  aspect-ratio: 1;
  cursor: grab;
  touch-action: none;
}
.canvas-wrap.dragging { cursor: grabbing; }
.canvas-wrap.drag-over { outline: 3px solid #7ef9ff; outline-offset: -3px; }
canvas { display: block; width: 100%; height: 100%; }

.drop-message {
  position: absolute;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  display: grid;
  gap: 4px;
  min-width: 210px;
  padding: 18px 24px;
  text-align: center;
  border: 1px solid rgba(255,255,255,.24);
  border-radius: 16px;
  background: rgba(0,0,0,.68);
  pointer-events: none;
}
.drop-message strong { font-size: 1.05rem; }
.drop-message span { color: #b9b9c3; font-size: .9rem; }
.drop-message.hidden { display: none; }
.tip { margin: 12px 4px 0; color: #a9a9b4; font-size: .9rem; }

.controls {
  position: sticky;
  top: 24px;
  display: grid;
  gap: 22px;
  padding: 24px;
  border-radius: 22px;
}

.upload-button, button {
  border: 0;
  border-radius: 13px;
  cursor: pointer;
  font-weight: 900;
  text-align: center;
  transition: transform .18s ease, filter .18s ease, opacity .18s ease;
}
.upload-button:hover, button:hover:not(:disabled) { transform: translateY(-2px); filter: brightness(1.08); }
.upload-button {
  padding: 15px 18px;
  color: #060607;
  background: linear-gradient(105deg, #7ef9ff, #cfff29 45%, #ff63d8);
}

.control-group { display: grid; gap: 10px; }
.control-group label { display: flex; justify-content: space-between; font-weight: 750; }
output { color: #7ef9ff; font-variant-numeric: tabular-nums; }
input[type="range"] { width: 100%; accent-color: #ff36c7; }
.button-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.secondary { padding: 12px; color: #fff; background: #25252e; }
.download { padding: 16px; color: #fff; background: linear-gradient(105deg, #7f3cff, #ff218f); }
button:disabled { cursor: not-allowed; opacity: .42; }
.privacy { margin: -4px 0 0; color: #8e8e99; font-size: .78rem; line-height: 1.5; }

@media (max-width: 820px) {
  .shell { padding-top: 28px; }
  .workspace { grid-template-columns: 1fr; }
  .controls { position: static; }
}