/* ============================================
   天天三国 - 实时聊天
   悬浮透明窗口 · 底部导航上方
   ============================================ */

/* ============================================
   聊天切换按钮
   ============================================ */
.chat-toggle-btn {
  position: fixed;
  bottom: 4.625rem;
  right: 0.75rem;
  z-index: 200;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  border: 1px solid var(--color-gold-dark);
  background: linear-gradient(135deg, rgba(139, 0, 0, 0.9), rgba(92, 0, 0, 0.9));
  color: var(--color-gold-light);
  font-size: 1.25rem;
  display: none; /* 登录后才显示 */
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md), var(--shadow-glow-red);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

.chat-toggle-btn:active {
  transform: scale(0.9);
}

.chat-toggle-btn.has-unread {
  animation: chatPulse 2s ease-in-out infinite;
}

.chat-toggle-btn .chat-badge {
  position: absolute;
  top: -0.25rem;
  right: -0.25rem;
  min-width: 1.125rem;
  height: 1.125rem;
  background: var(--color-danger);
  color: #fff;
  font-size: 0.625rem;
  font-weight: 700;
  border-radius: 0.5625rem;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.25rem;
  border: 2px solid var(--color-bg-dark);
}

@keyframes chatPulse {
  0%, 100% { box-shadow: var(--shadow-md), 0 0 8px rgba(218, 165, 32, 0.3); }
  50% { box-shadow: var(--shadow-md), 0 0 16px rgba(218, 165, 32, 0.6); }
}

/* ============================================
   聊天窗口
   ============================================ */
.chat-window {
  position: fixed;
  bottom: 4.625rem;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 1rem);
  max-width: 29rem;
  height: 20rem;
  z-index: 199;
  display: none;
  flex-direction: column;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  border: 1px solid rgba(74, 48, 48, 0.6);
  border-bottom: none;
  overflow: hidden;

  /* 透明毛玻璃效果 */
  background: rgba(20, 12, 12, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.4);
}

.chat-window.open {
  display: flex;
  animation: chatSlideUp 0.25s ease-out;
}

@keyframes chatSlideUp {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* 聊天头部 */
.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  background: rgba(30, 18, 18, 0.6);
  border-bottom: 1px solid rgba(74, 48, 48, 0.5);
  flex-shrink: 0;
}

.chat-header-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-gold);
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.chat-header-title::before {
  content: '💬';
  font-size: 0.875rem;
}

.chat-online-count {
  font-size: 0.6875rem;
  color: var(--color-text-dim);
  font-weight: 400;
}

.chat-close-btn {
  width: 1.75rem;
  height: 1.75rem;
  border: none;
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-dim);
  border-radius: 50%;
  font-size: 0.875rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.chat-close-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--color-text);
}

/* 消息列表 */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  scroll-behavior: smooth;
}

/* 单条消息 */
.chat-msg {
  font-size: 0.8125rem;
  line-height: 1.5;
  padding: 0.125rem 0;
  word-break: break-word;
}

.chat-msg-name {
  font-weight: 600;
  color: var(--color-gold);
  margin-right: 0.375rem;
  cursor: default;
}

.chat-msg-name.self {
  color: var(--color-primary-light);
}

.chat-msg-content {
  color: var(--color-text);
}

.chat-msg-time {
  font-size: 0.625rem;
  color: var(--color-text-dim);
  margin-left: 0.375rem;
  opacity: 0.7;
}

/* 系统消息 */
.chat-msg-system {
  font-size: 0.6875rem;
  color: var(--color-text-dim);
  text-align: center;
  padding: 0.125rem 0;
  font-style: italic;
}

/* 输入区 */
.chat-input-area {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: rgba(30, 18, 18, 0.6);
  border-top: 1px solid rgba(74, 48, 48, 0.5);
  flex-shrink: 0;
}

.chat-input {
  flex: 1;
  height: 2.125rem;
  padding: 0 0.625rem;
  font-size: 0.8125rem;
  background: rgba(37, 24, 24, 0.8);
  border: 1px solid var(--color-border);
  border-radius: 1.0625rem;
  color: var(--color-text);
  transition: border-color var(--transition-fast);
}

.chat-input:focus {
  border-color: var(--color-gold);
  box-shadow: none;
}

.chat-input::placeholder {
  color: var(--color-text-dim);
  opacity: 0.5;
}

.chat-send-btn {
  width: 2.125rem;
  height: 2.125rem;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-gold-light);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  flex-shrink: 0;
}

.chat-send-btn:active {
  transform: scale(0.9);
}

.chat-send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ============================================
   响应式
   ============================================ */
@media (min-width: 481px) {
  .chat-toggle-btn {
    bottom: 5.125rem;
    right: calc(50% - 15rem + 0.75rem); /* 480/2=240, offset 0.75rem from container right edge */
  }

  .chat-window {
    bottom: 5.125rem;
  }
}

@media (min-width: 768px) {
  .chat-window {
    max-width: 29rem;
  }
}

/* iPhone safe area */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  .chat-toggle-btn {
    bottom: calc(4.625rem + env(safe-area-inset-bottom));
  }

  .chat-window {
    bottom: calc(4.625rem + env(safe-area-inset-bottom));
  }
}