* {
  box-sizing: border-box;
}

:root {
  --bg: #0f1115;
  --panel: #161b22;
  --topbar: #1e293b;
  --hover: #202938;
  --active: #2d3c52;
  --search: #1c2431;
  --border: #293244;
  --text: #ffffff;
  --muted: #94a3b8;
  --accent: #60a5fa;
  --bubble-in: #1e2532;
  --bubble-out: #2563eb;
  --danger: #ef4444;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

.sidebar {
  width: 330px;
  min-width: 330px;
  max-width: 330px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  overflow-y: auto;
}

.sidebar-header {
  height: 58px;
  display: flex;
  align-items: center;
  padding: 0 18px;
  font-size: 20px;
  font-weight: 800;
  background: var(--topbar);
}

.sidebar-tools,
.message-search {
  padding: 10px;
  border-bottom: 1px solid var(--border);
}

.chat-item {
  padding: 13px 15px;
  margin: 6px;
  border-radius: 12px;
  cursor: pointer;
  min-height: 72px;
  transition: none;
}

.chat-item:hover {
  background: var(--hover);
}

.chat-item.active {
  background: linear-gradient(90deg, rgba(96,165,250,.2), rgba(96,165,250,.08));
}

.chat-title {
  font-size: 15px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-type,
.chat-time,
.time {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 16px;
  background: var(--topbar);
}

.chat-title-top {
  min-width: 0;
  flex: 1;
  font-weight: 800;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.messages {
  flex: 1;
  padding: 18px 24px;
  overflow-y: auto;
  overflow-anchor: none;
  background:
    radial-gradient(circle at top left, rgba(96,165,250,.08), transparent 30%),
    var(--bg);
}

.message-row {
  display: flex;
  width: 100%;
  margin-bottom: 9px;
  animation: none;
}

.message-row.bot {
  justify-content: flex-end;
}

.message-wrap {
  max-width: 70%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.message-row.bot .message-wrap {
  align-items: flex-end;
}

.sender {
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 3px;
  font-weight: 700;
}

.bubble {
  max-width: 560px;
  padding: 10px 14px;
  border-radius: 18px 18px 18px 6px;
  background: var(--bubble-in);
  color: white;
  white-space: pre-wrap;
  word-break: break-word;
}

.message-row.bot .bubble {
  background: var(--bubble-out);
  border-radius: 18px 18px 6px 18px;
}

.message-text {
  font-size: 15px;
  line-height: 1.35;
}

.message-meta {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 4px;
}

.reply-preview {
  border-left: 4px solid var(--accent);
  background: rgba(255,255,255,.04);
  border-radius: 8px;
  padding: 7px 9px;
  margin-bottom: 7px;
  font-size: 12px;
}

.reply-name {
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 2px;
}

.reply-text {
  color: #d1d5db;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.reply-button {
  padding: 3px 9px;
  font-size: 11px;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
  color: var(--accent);
}

.reply-box {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--panel);
  border-top: 1px solid var(--border);
  padding: 9px 14px;
  color: #d1d5db;
  font-size: 13px;
}

.input-bar {
  display: flex;
  gap: 10px;
  padding: 14px;
  background: var(--panel);
  border-top: 1px solid var(--border);
}

input {
  flex: 1;
  padding: 12px 14px;
  border-radius: 14px;
  border: none;
  outline: none;
  font-size: 15px;
  background: var(--search);
  color: white;
}

input::placeholder {
  color: #94a3b8;
}

button {
  padding: 10px 17px;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  background: var(--accent);
  color: white;
  font-weight: 800;
}

button:hover {
  opacity: .9;
}

.danger {
  background: var(--danger);
}

.switch-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
}

.switch-label input {
  display: none;
}

.switch {
  width: 40px;
  height: 22px;
  background: #475569;
  border-radius: 999px;
  position: relative;
}

.switch::before {
  content: "";
  width: 18px;
  height: 18px;
  background: white;
  border-radius: 50%;
  position: absolute;
  top: 2px;
  left: 2px;
  transition: .2s;
}

.switch-label input:checked + .switch {
  background: var(--accent);
}

.switch-label input:checked + .switch::before {
  left: 20px;
}

.empty {
  color: var(--muted);
  text-align: center;
  margin-top: 40px;
}

.hidden {
  display: none;
}

::-webkit-scrollbar {
  width: 7px;
}

::-webkit-scrollbar-thumb {
  background: #475569;
  border-radius: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}


@media (max-width: 768px) {
  .sidebar {
    width: 270px;
    min-width: 270px;
    max-width: 270px;
  }

  .message-wrap {
    max-width: 86%;
  }

  .bubble {
    max-width: 100%;
  }

  .topbar-actions {
    gap: 6px;
  }
}