* { box-sizing: border-box; }

html, body { height: 100%; margin: 0; }

body {
  font-family: system-ui, Arial;
  max-width: 900px;
  margin: 24px auto;
  padding: 0 12px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

#logo {
  height: 40px;
  max-width: 40%;
  object-fit: contain;
}

#log {
  border: 1px solid #ddd;
  padding: 12px;
  overflow: auto;
  white-space: pre-wrap;
  flex: 1 1 auto;
  margin-top: 8px;
}

textarea {
  width: 100%;
  height: 20vh;
  min-height: 140px;
  resize: none;
  margin-bottom: 70px;
}

#btnbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #fff;
  border-top: 1px solid #ddd;
  padding: 6px 8px;
}

#btnrow2 { display: flex; gap: 8px; }

#translate, #send {
  flex: 1;
  height: 34px;
  background: #2563eb;
  color: #fff;
  border: none;
}

.you { font-weight: bold; }
.ai { font-weight: normal; }