:root {
  --chat-bg: var(--bg);
  --chat-panel: var(--surface);
  --chat-surface: var(--panel-bg);
  --chat-border: rgba(148, 163, 184, 0.2);
  --chat-text: var(--text);
  --chat-muted: var(--muted);
  --chat-own-bg: var(--brand, #2563eb);
  --chat-own-text: #ffffff;
  --chat-other-bg: #eef2f7;
  --chat-other-text: #172033;
  --chat-own: var(--chat-own-bg);
  --chat-other: var(--chat-other-bg);
  --chat-accent: #3b82f6;
  --chat-success: #16a34a;
  --chat-danger: #ef4444;
  --chat-shadow: var(--shadow);
}

html[data-theme="dark"] {
  --chat-panel: #111827;
  --chat-surface: #0f172a;
  --chat-own-bg: #3478f6;
  --chat-own-text: #ffffff;
  --chat-other-bg: #172235;
  --chat-other-text: #f3f6fb;
  --chat-other: var(--chat-other-bg);
  --chat-border: rgba(148, 163, 184, 0.18);
}

.chat-page {
  padding: 18px 20px 48px;
  min-height: calc(100vh - 80px);
  background: var(--chat-bg);
  transition: background-color 0.18s ease;
}

.chat-shell {
  max-width: 1100px;
  margin: 0 auto;
  background: var(--chat-panel);
  border: 1px solid var(--chat-border);
  border-radius: 28px;
  box-shadow: var(--chat-shadow);
  overflow: hidden;
  transition: background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  border-bottom: 1px solid var(--chat-border);
  background: rgba(255,255,255,0.02);
}

.chat-label {
  color: var(--chat-muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 6px;
}

.chat-header h1 {
  font-size: clamp(1.4rem, 2vw, 2rem);
  margin: 0;
}

.chat-online-wrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--chat-text);
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.18);
  border-radius: 999px;
  padding: 8px 12px;
}

.online-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--chat-success);
  box-shadow: 0 0 0 6px rgba(34, 197, 94, 0.12);
}

.chat-messages {
  height: 58vh;
  min-height: 420px;
  overflow-y: auto;
  padding: 24px 20px 12px;
  background: rgba(0,0,0,0.01);
}

.message {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
  animation: messageEnter 0.24s ease;
}

.message.removing {
  opacity: 0;
  transform: scale(0.98);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.message-row {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  max-width: 72%;
}

.message-row.own {
  margin-left: auto;
  justify-content: flex-end;
  flex-direction: row-reverse;
}

.message-row.other {
  margin-right: auto;
  justify-content: flex-start;
  flex-direction: row;
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, #0f172a, #334155);
  color: white;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.message-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.message-bubble-wrap {
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  max-width: calc(100% - 46px);
}

.message-bubble-wrap.own {
  justify-content: flex-end;
}

.message-card {
  background: var(--chat-other-bg);
  color: var(--chat-other-text);
  border: 1px solid var(--chat-border);
  border-radius: 18px 18px 18px 6px;
  padding: 12px 14px 10px;
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.04);
  transition: background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
  max-width: 100%;
}

.message-row.own .message-card {
  background: var(--chat-own-bg);
  color: var(--chat-own-text);
  border: 1px solid rgba(96, 165, 250, 0.3);
  border-radius: 18px 18px 6px 18px;
}

.message-row.other .message-card {
  background: var(--chat-other-bg);
  color: var(--chat-other-text);
  border-radius: 18px 18px 18px 6px;
}

.message-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

.sender-name {
  font-weight: 700;
  font-size: 0.84rem;
  opacity: 0.92;
}

.message-time {
  font-size: 0.7rem;
  opacity: 0.8;
  white-space: nowrap;
}

.message-text {
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  line-height: 1.55;
}

.message-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: 8px;
  min-width: 24px;
}

.message-menu-button {
  width: 28px;
  height: 28px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: inherit;
  font-size: 1.15rem;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.message-row.other .message-menu-button {
  display: none;
}

.message-menu-button:hover,
.message-menu-button.is-open {
  background: rgba(148, 163, 184, 0.12);
}

.message-menu {
  position: absolute;
  top: 6px;
  right: -8px;
  transform: translateY(-4px);
  min-width: 170px;
  background: var(--panel-bg);
  border: 1px solid var(--chat-border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 8px;
  z-index: 30;
}

.message-menu.hidden {
  display: none;
}

.message-menu-item {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--text);
  padding: 10px 12px;
  border-radius: 10px;
  text-align: left;
  cursor: pointer;
  font-size: 0.95rem;
}

.message-menu-item:hover {
  background: rgba(148, 163, 184, 0.08);
}

.message-menu-item.danger {
  color: #ef4444;
}

.chat-toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%) translateY(10px);
  background: rgba(15, 23, 42, 0.9);
  color: #fff;
  padding: 10px 14px;
  border-radius: 999px;
  font-size: 0.84rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
  z-index: 999;
}

.chat-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.message-image,
.message-audio {
  margin-top: 8px;
}

.message-image img {
  display: block;
  width: min(340px, 100%);
  max-height: 320px;
  border-radius: 12px;
  object-fit: cover;
}

.audio-player {
  width: min(320px, 100%);
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.12);
}

.reply-box {
  margin-bottom: 8px;
  padding: 8px 10px;
  border-left: 3px solid var(--chat-accent);
  border-radius: 8px;
  background: rgba(59,130,246,0.08);
}

.reply-box strong {
  display: block;
  margin-bottom: 4px;
}

.empty-chat {
  padding: 18px 20px 24px;
  text-align: center;
  color: var(--chat-muted);
}

.empty-chat.hidden,
.typing-indicator.hidden,
.reply-preview.hidden,
.hidden {
  display: none !important;
}

.typing-indicator {
  padding: 0 20px 10px;
  color: var(--chat-muted);
  font-size: 0.82rem;
}

.chat-composer {
  border-top: 1px solid var(--chat-border);
  padding: 16px 20px 20px;
  background: rgba(255,255,255,0.01);
}

.reply-preview {
  margin-bottom: 12px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(59,130,246,0.08);
  border: 1px solid rgba(59,130,246,0.14);
  color: var(--chat-text);
}

.reply-preview-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  margin-bottom: 6px;
}

.reply-preview strong {
  font-weight: 700;
}

.composer-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

#chatMessageInput {
  flex: 1;
  min-width: 0;
  min-height: 46px;
  max-height: 180px;
  resize: vertical;
  border: 1px solid var(--chat-border);
  border-radius: 14px;
  background: var(--chat-surface);
  color: var(--chat-text);
  padding: 12px 14px;
  font-size: 1rem;
  line-height: 1.5;
  outline: none;
  font-family: inherit;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

#chatMessageInput:focus {
  border-color: rgba(59,130,246,0.6);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.12);
}

.icon-button,
.chat-send-button,
.reply-cancel {
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
}

.icon-button {
  width: 42px;
  height: 42px;
  background: var(--chat-surface);
  border: 1px solid var(--chat-border);
  font-size: 1.1rem;
}

.chat-send-button {
  min-height: 48px;
  padding: 0 22px;
  border-radius: 14px;
  border: 1px solid rgba(59, 130, 246, 0.24);
  background: linear-gradient(135deg, var(--button-bg), color-mix(in srgb, var(--button-bg) 75%, #0f172a 25%));
  color: var(--button-text);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  box-shadow: 0 10px 24px rgba(59, 130, 246, 0.18);
}

.chat-send-button::before {
  content: '➤';
  font-size: 0.9rem;
  transform: translateY(-1px);
}

.chat-send-button:hover,
.icon-button:hover,
.reply-cancel:hover {
  transform: translateY(-1px);
}

.chat-send-button[data-loading="true"]::before {
  content: '◌';
  animation: pulseSend 1.1s linear infinite;
}

@keyframes pulseSend {
  0% { opacity: 0.5; transform: translateY(-1px) scale(0.9); }
  50% { opacity: 1; transform: translateY(-1px) scale(1.1); }
  100% { opacity: 0.5; transform: translateY(-1px) scale(0.9); }
}

.chat-send-button:hover {
  box-shadow: 0 12px 28px rgba(59, 130, 246, 0.24);
}

.chat-send-button:active {
  transform: translateY(0) scale(0.99);
}

.chat-send-button:focus-visible {
  outline: 3px solid rgba(59, 130, 246, 0.28);
  outline-offset: 3px;
}

.chat-send-button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

@keyframes messageEnter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 640px) {
  .chat-page {
    padding: 18px 12px 26px;
  }

  .chat-shell {
    border-radius: 20px;
  }

  .chat-header {
    padding: 14px 16px;
    align-items: flex-start;
  }

  .chat-messages {
    min-height: 360px;
    padding-left: 12px;
    padding-right: 12px;
  }

  .message-row {
    max-width: 92%;
  }

  .composer-row {
    flex-wrap: wrap;
  }

  #chatMessageInput {
    order: 3;
    width: 100%;
  }
}