:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-elev-2: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --text-muted: #6e7681;
  --accent: #da7756;
  --accent-2: #f0a37a;
  --user-bubble: #1f6feb;
  --ok: #3fb950;
  --warn: #d29922;
  --err: #f85149;
  --tool-bg: #1d2733;
  --tool-border: #2d4a6b;
  --code-bg: #0a0e14;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC",
    "PingFang TC", "Microsoft JhengHei", sans-serif;
  --mono: "SF Mono", Menlo, Monaco, Consolas, "Courier New", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

#app {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.view {
  display: none;
  flex: 1;
  min-height: 0;
  flex-direction: column;
}
.view.active {
  display: flex;
}

.muted {
  color: var(--text-dim);
}
.hidden {
  display: none !important;
}
.error {
  color: var(--err);
  min-height: 1.2em;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: 0;
  border-radius: 6px;
  padding: 8px 14px;
  transition: filter 0.15s, background 0.15s;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  font-weight: 500;
}
.btn-primary:hover {
  filter: brightness(1.1);
}
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  background: var(--bg-elev);
  color: var(--text);
}
.btn-ghost.small {
  padding: 2px 8px;
  font-size: 13px;
}
.full {
  width: 100%;
}

input,
textarea {
  font-family: inherit;
  font-size: inherit;
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
}
input:focus,
textarea:focus {
  outline: 0;
  border-color: var(--accent);
}

/* ===== Login view ===== */
#view-login {
  align-items: center;
  justify-content: center;
}
.login-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px;
  width: 360px;
  text-align: center;
}
.login-card .logo {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.login-card p {
  margin: 0 0 24px;
}
.login-card .btn-primary {
  width: 100%;
  padding: 12px;
  font-size: 15px;
}

/* ===== Topbar ===== */
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
  flex-shrink: 0;
}
.topbar .brand {
  font-weight: 600;
  font-size: 16px;
}
.topbar .brand.small {
  font-size: 14px;
}
.topbar .right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
}
.status-dot.connected {
  background: var(--ok);
  box-shadow: 0 0 8px var(--ok);
}
.status-dot.connecting {
  background: var(--warn);
}
.status-dot.disconnected {
  background: var(--err);
}

/* ===== Lobby ===== */
.lobby-main {
  padding: 24px;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  flex: 1;
  overflow-y: auto;
}
.lobby-main h2 {
  margin: 0 0 16px;
  font-weight: 500;
}
.instance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.instance-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s;
}
.instance-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.instance-card .name {
  font-weight: 600;
  margin-bottom: 4px;
}
.instance-card .url {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-muted);
  word-break: break-all;
  margin-bottom: 10px;
}
.instance-card .stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  font-size: 12px;
}
.instance-card .stat-label {
  color: var(--text-muted);
}
.instance-card .stat-val {
  font-weight: 500;
}
.instance-card .actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.instance-card .delete {
  margin-left: auto;
  color: var(--err);
  background: transparent;
  border: 0;
  padding: 4px 6px;
  font-size: 12px;
}

.add-instance {
  background: var(--bg-elev);
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 16px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.add-instance input {
  flex: 1;
  min-width: 200px;
}

/* ===== Workspace ===== */
.workspace {
  flex: 1;
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-rows: 1fr auto;
  min-height: 0;
  overflow: hidden;
}
.ws-sidebar {
  grid-row: 1 / span 2;
  background: var(--bg-elev);
  border-right: 1px solid var(--border);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;
}
.sidebar-section {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.sidebar-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.session-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.session-item {
  padding: 6px 8px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text-dim);
  border: 1px solid transparent;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
}
.session-item:hover {
  background: var(--bg-elev-2);
  color: var(--text);
}
.session-item.active {
  background: var(--bg-elev-2);
  color: var(--text);
  border-color: var(--border);
}
.session-item .sess-preview {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.session-item .sess-time {
  font-size: 10px;
  font-family: var(--mono);
}
.health-panel {
  font-family: var(--mono);
  font-size: 11px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  color: var(--text-dim);
  white-space: pre-wrap;
}

.chat-pane {
  grid-column: 2;
  grid-row: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px 32px;
  scroll-behavior: smooth;
}
.welcome {
  text-align: center;
  padding: 80px 0;
}
.welcome h1 {
  font-size: 32px;
  margin: 0 0 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.msg {
  max-width: 900px;
  margin: 0 auto 24px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.msg .avatar {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  margin-top: 2px;
}
.msg.user .avatar {
  background: var(--user-bubble);
  color: #fff;
}
.msg.assistant .avatar {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
}
.msg .body {
  flex: 1;
  min-width: 0;
}
.msg .role-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
  text-transform: capitalize;
}
.msg .content {
  font-size: 14px;
  line-height: 1.65;
}
.msg .content p {
  margin: 0 0 10px;
}
.msg .content p:last-child {
  margin-bottom: 0;
}
.msg .content pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.5;
  margin: 8px 0;
}
.msg .content code {
  font-family: var(--mono);
  font-size: 12.5px;
  background: var(--bg-elev-2);
  padding: 1px 5px;
  border-radius: 3px;
}
.msg .content pre code {
  background: transparent;
  padding: 0;
}
.msg .content ul,
.msg .content ol {
  padding-left: 22px;
  margin: 6px 0;
}
.msg .content a {
  color: var(--accent-2);
}

/* Tool use cards */
.tool-card {
  background: var(--tool-bg);
  border: 1px solid var(--tool-border);
  border-radius: 6px;
  margin: 8px 0;
  font-family: var(--mono);
  font-size: 12px;
  overflow: hidden;
}
.tool-head {
  padding: 6px 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}
.tool-head:hover {
  background: rgba(255, 255, 255, 0.03);
}
.tool-icon {
  color: var(--accent-2);
}
.tool-name {
  font-weight: 600;
  color: var(--text);
}
.tool-summary {
  color: var(--text-dim);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}
.tool-status {
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 10px;
}
.tool-status.running {
  background: var(--warn);
  color: #000;
}
.tool-status.ok {
  background: var(--ok);
  color: #000;
}
.tool-status.err {
  background: var(--err);
  color: #fff;
}
.tool-body {
  padding: 8px 10px;
  border-top: 1px solid var(--tool-border);
  background: var(--code-bg);
  max-height: 300px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text-dim);
}
.tool-body.hidden {
  display: none !important;
}

.typing-dots {
  display: inline-flex;
  gap: 4px;
  padding: 4px 0;
}
.typing-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: blink 1.2s infinite;
}
.typing-dots span:nth-child(2) {
  animation-delay: 0.2s;
}
.typing-dots span:nth-child(3) {
  animation-delay: 0.4s;
}
@keyframes blink {
  0%, 60%, 100% { opacity: 0.3; }
  30% { opacity: 1; }
}

.result-bar {
  max-width: 900px;
  margin: 8px auto 24px;
  font-size: 12px;
  color: var(--text-muted);
  text-align: right;
  padding-left: 42px;
}

.chat-input-row {
  grid-column: 2;
  grid-row: 2;
  display: flex;
  gap: 8px;
  padding: 12px 32px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.chat-input-row textarea {
  flex: 1;
  resize: none;
  max-height: 200px;
  font-family: inherit;
}
.chat-input-row button {
  align-self: flex-end;
}

/* Terminal pane */
.terminal-pane {
  grid-column: 2;
  grid-row: 2;
  height: 280px;
  background: var(--code-bg);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}
.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 10px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-dim);
}
.terminal-host {
  flex: 1;
  padding: 6px;
  overflow: hidden;
}
.terminal-host .xterm {
  height: 100%;
}

/* When terminal is shown, hide chat input */
.terminal-visible .chat-input-row {
  display: none;
}
.terminal-visible .terminal-pane {
  display: flex;
}

@media (max-width: 720px) {
  .workspace {
    grid-template-columns: 1fr;
  }
  .ws-sidebar {
    display: none;
  }
  .chat-messages {
    padding: 16px;
  }
  .chat-input-row {
    padding: 12px;
  }
}