* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font-family: system-ui, sans-serif;
  background: #14161a;
  color: #e8e8e8;
}

body {
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: #1c1f26;
  border-bottom: 1px solid #2c313a;
}

header h1 {
  font-size: 16px;
  margin: 0;
  font-weight: 600;
}

.controls { display: flex; gap: 8px; }

.btn {
  padding: 6px 14px;
  font-size: 13px;
  color: #e8e8e8;
  background: #2d66d6;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

.btn:hover { background: #3b76e8; }

main {
  flex: 1;
  display: flex;
  position: relative;
  min-height: 0;
}

#drop-zone {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 2px dashed #3a4150;
  margin: 16px;
  border-radius: 8px;
  text-align: center;
  transition: border-color 0.15s ease, background 0.15s ease;
}

#drop-zone.dragover {
  border-color: #2d66d6;
  background: #1a2030;
}

#drop-zone p { margin: 0; font-size: 15px; }
#drop-zone .hint { font-size: 12px; color: #8a93a5; }
#drop-zone code { background: #232833; padding: 2px 6px; border-radius: 3px; }

#viewer {
  flex: 1;
  min-height: 0;
}

#viewer canvas { display: block; width: 100%; height: 100%; }

footer {
  padding: 6px 16px;
  font-size: 12px;
  color: #9aa3b4;
  background: #1c1f26;
  border-top: 1px solid #2c313a;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}