/* 语音助手样式 */
.voice-float {
  position: fixed; bottom: 24px; right: 24px; z-index: 99999;
  font-family: "PingFang SC","Microsoft YaHei",sans-serif;
}
.voice-btn {
  width: 56px; height: 56px; border-radius: 50%; border: none;
  background: linear-gradient(135deg,#2980b9,#1a5276);
  color:#fff; font-size:24px; cursor:pointer;
  box-shadow:0 4px 16px rgba(26,82,118,0.35);
  display:flex; align-items:center; justify-content:center;
  transition:transform 0.2s;
}
.voice-btn:hover{transform:scale(1.08)}
.voice-btn:active{transform:scale(0.95)}
.voice-btn.thinking{animation:spin 1s linear infinite;background:linear-gradient(135deg,#f39c12,#e67e22)}
@keyframes spin{from{transform:rotate(0)}to{transform:rotate(360deg)}}

.voice-panel {
  display:none; position:absolute; bottom:68px; right:0;
  width:320px; max-height:460px; background:#fff; border-radius:12px;
  box-shadow:0 8px 32px rgba(0,0,0,0.18); overflow:hidden;
}
.voice-panel.open{display:flex;flex-direction:column}
.voice-header {
  background:linear-gradient(135deg,#2980b9,#1a5276);color:#fff;
  padding:10px 14px;font-size:13px;font-weight:700;
  display:flex;justify-content:space-between;align-items:center;
}
.voice-header .close-btn{background:none;border:none;color:#fff;font-size:16px;cursor:pointer}

.voice-messages{flex:1;overflow-y:auto;padding:10px;min-height:120px;max-height:300px}
.voice-msg{margin:6px 0;padding:8px 12px;border-radius:12px;font-size:13px;line-height:1.5;max-width:85%;word-break:break-word}
.voice-msg.student{background:#e8f5e9;color:#2e7d32;margin-left:auto;text-align:right;border-bottom-right-radius:4px}
.voice-msg.ai{background:#e3f2fd;color:#1565c0;margin-right:auto;border-bottom-left-radius:4px}
.voice-msg.system{background:#f5f5f5;color:#888;font-size:11px;text-align:center;max-width:100%}

.voice-input-area{display:flex;border-top:1px solid #eee;padding:8px 10px;gap:6px;align-items:center}
.voice-input-area input{
  flex:1;border:1px solid #dce1e8;border-radius:20px;padding:8px 14px;
  font-size:13px;outline:none;font-family:inherit;background:#fafbfc;
}
.voice-input-area input:focus{border-color:#2980b9;background:#fff}
/* Chrome 输入框内麦克风按钮 */
.voice-input-area input::-webkit-input-speech-button {
  cursor:pointer;opacity:0.7;
}
.voice-input-area input::-webkit-input-speech-button:hover {opacity:1}
.voice-input-area .send-btn{
  width:38px;height:38px;border-radius:50%;border:none;cursor:pointer;
  font-size:16px;background:#2980b9;color:#fff;
  display:flex;align-items:center;justify-content:center;
  flex-shrink:0;
}
.voice-input-area .send-btn:disabled{background:#ccc;cursor:not-allowed}

/* 科学平台绿色主题 */
body.science .voice-btn{background:linear-gradient(135deg,#27ae60,#1e8449)}
body.science .voice-header{background:linear-gradient(135deg,#27ae60,#1e8449)}
body.science .voice-msg.ai{background:#e8f5e9;color:#1b5e20}
body.science .voice-input-area .send-btn{background:#27ae60}
body.science .voice-input-area input:focus{border-color:#27ae60}