* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: #0a0a10;
  color: #00ffcc;
  font-family: 'Courier New', Courier, monospace;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

#calc-terminal {
  background: rgba(13, 13, 20, 0.95);
  border: 1px solid #00ffcc;
  border-radius: 8px;
  width: 100%;
  max-width: 700px;
  padding: 20px;
  box-shadow: 0 0 25px rgba(0, 255, 204, 0.15);
}

.terminal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px dashed rgba(0, 255, 204, 0.3);
  padding-bottom: 10px;
  margin-bottom: 15px;
  font-size: 12px;
  letter-spacing: 1px;
}

.title { font-weight: bold; }
.status-loading { color: #ffd700; }
.status-ready { color: #00ffcc; }
.status-error { color: #ff3333; }

#terminal-output {
  height: 300px;
  overflow-y: auto;
  margin-bottom: 15px;
  font-size: 14px;
  line-height: 1.5;
}

#terminal-output::-webkit-scrollbar { width: 5px; }
#terminal-output::-webkit-scrollbar-thumb { background: rgba(0, 255, 204, 0.4); }

.line { margin-bottom: 6px; word-break: break-all; }
.line.system { color: rgba(0, 255, 204, 0.6); font-style: italic; }
.line.command { color: #ffffff; }
.line.result { color: #ffd700; font-weight: bold; }
.line.error { color: #ff3333; }

.input-line {
  display: flex;
  align-items: center;
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(0, 255, 204, 0.4);
  border-radius: 4px;
  padding: 8px 12px;
}

.prompt {
  color: #8b00ff;
  font-weight: bold;
  margin-right: 10px;
  user-select: none;
}

#calc-input {
  background: transparent;
  border: none;
  color: #00ffcc;
  font-family: inherit;
  font-size: 14px;
  outline: none;
  width: 100%;
}

#calc-input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}