:root {
  color-scheme: dark;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  max-width: 900px;
  margin: 24px auto;
  padding: 0 16px 40px;
  background: #0b1220;
  color: #e2e8f0;
  line-height: 1.5;
}

h1 {
  margin-bottom: 4px;
}

p {
  color: #94a3b8;
}

.video-wrap {
  position: relative;
  width: 100%;
  max-width: 720px;
  margin: 16px 0;
  background: #000;
  border-radius: 8px;
  overflow: hidden;
}

video {
  width: 100%;
  display: block;
}

canvas#overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  transition: box-shadow 0.15s ease;
}

canvas#overlay.alert-border {
  box-shadow: inset 0 0 0 8px #ff2020;
}

button {
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 6px;
  border: none;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
}

button:hover {
  background: #1d4ed8;
}

button:disabled {
  background: #334155;
  cursor: default;
}

#status {
  margin-top: 14px;
  font-size: 16px;
  padding: 12px 14px;
  border-left: 4px solid #2563eb;
  background: #111827;
  border-radius: 4px;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid #1e293b;
}

.controls label {
  display: flex;
  flex-direction: column;
  font-size: 14px;
  gap: 6px;
}

input[type="range"] {
  width: 100%;
}

audio {
  display: none;
}