/* ===== CSS 变量 & 基础重置 ===== */
:root {
  --bg: #0d1117;
  --bg2: #161b22;
  --bg3: #21262d;
  --border: #30363d;
  --accent: #7c3aed;
  --accent2: #a855f7;
  --accent-gl: rgba(124, 58, 237, .15);
  --green: #10b981;
  --red: #ef4444;
  --amber: #f59e0b;
  --text: #e6edf3;
  --text2: #8b949e;
  --text3: #6e7681;
  --radius: 14px;
}

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

html,
body {
  height: 100%;
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

/* ===== 背景辉光 ===== */
.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 60% 40% at 20% 20%, rgba(124, 58, 237, .10) 0%, transparent 70%),
    radial-gradient(ellipse 50% 30% at 80% 80%, rgba(168, 85, 247, .06) 0%, transparent 70%);
}

/* ===== 整体布局 ===== */
.app {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ===== 顶部栏 ===== */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: rgba(22, 27, 34, .85);
  backdrop-filter: blur(16px);
  flex-shrink: 0;
  position: relative;
  z-index: 501;
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  box-shadow: 0 3px 12px rgba(124, 58, 237, .35);
}

.app-title {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -.3px;
}

.app-title span {
  color: var(--accent2);
  font-weight: 400;
}

/* 语言选择 */
.lang-selectors {
  display: flex;
  align-items: center;
  gap: 6px;
}

.lang-select {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: .78rem;
  font-family: inherit;
  outline: none;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
}

.lang-select:focus {
  border-color: var(--accent);
}

.lang-arrow {
  color: var(--accent2);
  font-size: .85rem;
  font-weight: 600;
}

/* 状态指示 */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text3);
  transition: background .3s;
  flex-shrink: 0;
}

.status-dot.connecting {
  background: var(--amber);
  animation: pulse 1s infinite;
}

.status-dot.recording {
  background: var(--red);
  animation: pulse .6s infinite;
}

.status-dot.connected {
  background: var(--green);
}

.status-dot.error {
  background: var(--red);
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1
  }

  50% {
    opacity: .3
  }
}

/* 右侧工具 */
.top-bar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text3);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: .75rem;
  cursor: pointer;
  font-family: inherit;
  transition: all .2s;
}

.icon-btn:hover {
  color: var(--text);
  border-color: var(--text3);
}

/* ===== 聊天区（占满剩余空间） ===== */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  /* 不设 overflow:hidden，否则剪切内部气泡 */
  position: relative;
}

.chat-stream {
  flex: 1;
  /* 底部增加 180px padding 防止气泡被底部固定的悬浮按钮/输入条遮挡 */
  padding: 20px 24px 180px 24px;
  overflow-y: auto;
  /* column-reverse: 新气泡天然锄定底部，局训兼容 overflow 滚动 */
  display: flex;
  flex-direction: column-reverse;
  gap: 16px;
  min-height: 0;
}

/* 空状态 */
.chat-empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--text3);
  font-size: .9rem;
  pointer-events: none;
}

.chat-empty .empty-icon {
  font-size: 3rem;
  opacity: .3;
}

/* ===== 气泡 ===== */
.bubble {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 18px;
  width: 100%;
  align-self: center;
  /* 统一居中 */
  animation: bubble-in .2s ease-out;
}

/* speaker-a: 居中，紫色背景 */
.bubble.speaker-a {
  align-self: center;
  background: var(--accent-gl);
}

/* speaker-b: 居中，蓝色背景 */
.bubble.speaker-b {
  align-self: center;
  background: rgba(59, 130, 246, .08);
}

/* 临时气泡 */
.bubble.interim {
  border-style: dashed;
  opacity: .85;
}

.bubble.speaker-a.interim {
  border-color: rgba(168, 85, 247, .5);
}

.bubble.speaker-b.interim {
  border-color: rgba(59, 130, 246, .5);
}

@keyframes bubble-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

/* 气泡内部 */
.bubble-orig {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  word-break: break-word;
}

.bubble-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 8px 0;
}

.bubble-trans {
  font-size: .92rem;
  line-height: 1.6;
  color: var(--text2);
  word-break: break-word;
}

.bubble-trans:empty {
  display: none;
}

/* 闪烁光标 */
.interim-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--accent2);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink .7s step-end infinite;
}

@keyframes blink {

  0%,
  100% {
    opacity: 1
  }

  50% {
    opacity: 0
  }
}

/* ===== 底部语音输入栏 ===== */
/* 默认向下讯出屏幕外，检测到语音时滑入 */
.voice-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  border-top: 1px solid var(--border);
  background: rgba(16, 20, 28, .95);
  backdrop-filter: blur(16px);
  padding: 12px 90px 12px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  transform: translateY(100%);
  transition: transform .35s cubic-bezier(.16, 1, .3, 1);
  z-index: 150;
}

.voice-bar.active {
  transform: translateY(0);
}

.voice-status {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 中央启动卡片（包裹 开始按钮和语言选择） */
.start-container {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  transition: opacity .35s, transform .35s;
}

.start-container.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -45%);
}

.start-container .lang-selectors {
  background: var(--bg2);
  padding: 12px 24px;
  border-radius: 999px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--border);
}

/* 居中开始按钮 */
.start-btn {
  padding: 16px 40px;
  border-radius: 30px;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  font-size: 1.15rem;
  font-weight: 600;
  box-shadow: 0 4px 24px rgba(124, 58, 237, .4);
  transition: all .25s cubic-bezier(.34, 1.56, .64, 1);
}

.start-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(124, 58, 237, .6);
}

.start-btn:active {
  transform: translateY(2px);
}

.start-btn:disabled {
  opacity: .5;
  cursor: not-allowed;
  transform: none;
}

/* 右下角悬浮停止按钮 */
.stop-btn {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 200;
  padding: 12px 26px;
  border-radius: 24px;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, #dc2626, #ef4444);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 20px rgba(239, 68, 68, .5);
  transition: all .25s cubic-bezier(.34, 1.56, .64, 1);
}

.stop-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(239, 68, 68, .7);
}

.stop-btn:active {
  transform: translateY(1px);
}

.stop-btn:disabled {
  opacity: .5;
  cursor: not-allowed;
  transform: none;
}

.stop-btn.hidden {
  display: none;
}

/* 语音状态文字 */
.voice-label {
  font-size: .82rem;
  color: var(--text2);
  font-weight: 500;
}

.voice-lang-tag {
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .72rem;
  font-weight: 600;
  background: var(--accent-gl);
  color: var(--accent2);
  border: 1px solid rgba(124, 58, 237, .3);
  transition: all .3s;
}

.voice-lang-tag.hidden {
  opacity: 0;
  transform: scale(.8);
}

/* 音量条 */
.vol-bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 18px;
}

.vol-bar-item {
  width: 3px;
  border-radius: 2px;
  background: var(--accent2);
  transition: height .05s;
}

/* ===== 设置面板（抽屉式） ===== */
.settings-drawer {
  position: fixed;
  top: 0;
  right: -340px;
  width: 320px;
  height: 100vh;
  background: var(--bg2);
  border-left: 1px solid var(--border);
  z-index: 600;
  transition: right .3s ease;
  display: flex;
  flex-direction: column;
  box-shadow: -8px 0 40px rgba(0, 0, 0, .5);
}

.settings-drawer.open {
  right: 0;
}

.settings-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: .9rem;
  font-weight: 600;
  color: var(--text);
}

.settings-close {
  background: none;
  border: none;
  color: var(--text3);
  font-size: 18px;
  cursor: pointer;
  transition: color .2s;
}

.settings-close:hover {
  color: var(--text);
}

.settings-body {
  padding: 20px;
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.settings-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.settings-group label {
  font-size: .78rem;
  font-weight: 600;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: .5px;
}

.settings-group input {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: .88rem;
  font-family: inherit;
  outline: none;
  transition: border-color .2s;
}

.settings-group input:focus {
  border-color: var(--accent);
}

.settings-group input::placeholder {
  color: var(--text3);
}

/* 遮罩 */
.settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .4);
  z-index: 590;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s;
}

.settings-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

/* 错误横幅 */
.error-banner {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(239, 68, 68, .15);
  border: 1px solid rgba(239, 68, 68, .3);
  border-radius: 10px;
  padding: 10px 20px;
  color: #fca5a5;
  font-size: .82rem;
  z-index: 9999;
  display: none;
  align-items: center;
  gap: 8px;
  backdrop-filter: blur(12px);
  max-width: 90%;
  text-align: center;
}

.error-banner.show {
  display: flex;
}

/* ===== 双人模式按钮 ===== */
.mode-btn {
  background: linear-gradient(135deg, #3b82f6, #06b6d4);
  color: #fff !important;
  border-color: transparent;
  border-radius: 20px;
  padding: 6px 14px;
  font-weight: 600;
  font-size: .82rem;
}

.mode-btn:hover {
  opacity: .85;
  color: #fff !important;
  border-color: transparent;
}

/* ===== 双人弹窗 ===== */
.dual-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  backdrop-filter: blur(4px);
}

.dual-overlay.hidden {
  display: none;
}

.dual-modal {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px 28px;
  width: min(400px, 90vw);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .5);
}

.dual-modal-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
}

.dual-modal-desc {
  font-size: .85rem;
  color: var(--text2);
  text-align: center;
}

.dual-action-btn {
  width: 100%;
  padding: 13px;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  font-size: .95rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  transition: opacity .2s;
}

.dual-action-btn.join {
  width: auto;
  padding: 10px 20px;
  background: linear-gradient(135deg, #3b82f6, #06b6d4);
}

.dual-action-btn:hover {
  opacity: .85;
}

.dual-divider {
  color: var(--text3);
  font-size: .8rem;
}

.dual-join-row {
  display: flex;
  gap: 10px;
  width: 100%;
}

.dual-input {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  color: var(--text);
  font-size: .95rem;
  font-family: inherit;
  outline: none;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 600;
}

.dual-input:focus {
  border-color: #3b82f6;
}

.dual-cancel-btn {
  background: none;
  border: none;
  color: var(--text3);
  cursor: pointer;
  font-size: .82rem;
  margin-top: -4px;
  padding: 4px 8px;
}

.dual-cancel-btn:hover {
  color: var(--text);
}

/* ===== 房间号显示条 ===== */
.room-bar {
  position: fixed;
  top: 64px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  background: var(--bg2);
  border: 1px solid rgba(59, 130, 246, .4);
  border-radius: 999px;
  padding: 8px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: .82rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, .3);
}

.room-bar.hidden {
  display: none;
}

.room-label {
  color: var(--text3);
}

.room-id {
  font-weight: 700;
  letter-spacing: 3px;
  color: #60a5fa;
  font-family: monospace;
  font-size: .95rem;
}

.peer-status {
  color: var(--text2);
  font-size: .78rem;
}