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

:root {
  --bg-primary: #f5f5f7;
  --bg-secondary: #ffffff;
  --bg-tertiary: #eaeaec;
  --text-primary: #1a1a1e;
  --text-secondary: #6b6b70;
  --text-muted: #a0a0a5;
  --accent: #0066cc;
  --border: #d0d0d4;
  --error: #cc3300;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.toolbar-left, .toolbar-center, .toolbar-right {
  display: flex;
  gap: 8px;
}

.toolbar-btn {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 8px 16px;
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  border-radius: 6px;
}

.toolbar-btn:hover {
  background: var(--border);
}

.theme-btn {
  background: var(--bg-tertiary);
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 8px 16px;
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  border-radius: 6px;
}

.theme-btn.active {
  color: var(--accent);
  border-color: var(--accent);
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.tabs-bar {
  display: flex;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 4px 4px 0;
  min-height: 40px;
  overflow-x: auto;
}

.tabs-placeholder {
  color: var(--text-muted);
  padding: 10px 20px;
  font-size: 13px;
}

.tab {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-bottom: none;
  cursor: pointer;
  font-size: 13px;
  margin-right: 2px;
  border-radius: 6px 6px 0 0;
}

.tab.active {
  background: var(--bg-primary);
  border-color: var(--text-primary);
  color: var(--accent);
}

.tab-close {
  cursor: pointer;
  opacity: 0.4;
  font-size: 16px;
  line-height: 1;
}

.tab-close:hover {
  opacity: 1;
}

.server-content {
  flex: 1;
  overflow: hidden;
}

.tab-content {
  display: none;
  flex-direction: column;
  height: 100%;
}

.tab-content.active {
  display: flex;
}

.welcome-message {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
}

.welcome-message h1 {
  font-size: 28px;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.server-header {
  padding: 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.server-header h2 {
  font-size: 18px;
  margin-bottom: 4px;
}

.server-header .server-address {
  color: var(--text-muted);
  font-size: 13px;
}

.quick-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.qa-buttons {
  display: flex;
  gap: 10px;
}

.qa-btn {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 8px 20px;
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  border-radius: 6px;
}

.qa-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.output {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background: var(--bg-primary);
  font-size: 14px;
  line-height: 1.6;
}

.output-line {
  white-space: pre-wrap;
  word-break: break-all;
  margin-bottom: 4px;
}

.output-line.command {
  color: var(--accent);
}

.output-line.response {
  color: var(--text-primary);
}

.output-line.error {
  color: var(--error);
}

.command-area {
  display: flex;
  gap: 10px;
  padding: 16px 20px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.cmd-input {
  flex: 1;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 10px 14px;
  font-family: inherit;
  font-size: 14px;
  border-radius: 6px;
}

.cmd-input:focus {
  outline: none;
  border-color: var(--accent);
}

.cmd-send {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 28px;
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  border-radius: 6px;
}

.cmd-send:hover {
  opacity: 0.9;
}

.status-bar {
  padding: 8px 20px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-muted);
}

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 28px;
  min-width: 420px;
  max-width: 90vw;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.modal-content h2 {
  margin-bottom: 20px;
  font-size: 18px;
  color: var(--text-primary);
}

.modal-content h3 {
  margin-top: 20px;
  margin-bottom: 10px;
  font-size: 15px;
  color: var(--text-primary);
}

.ref-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 12px;
}

.ref-table td {
  padding: 6px 10px;
  text-align: left;
  font-size: 14px;
}

.ref-table td:first-child {
  width: 45%;
}

.ref-table code {
  background: var(--bg-tertiary);
  padding: 3px 8px;
  border-radius: 4px;
  font-family: monospace;
}

.modal-large {
  min-width: 620px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--text-secondary);
}

.form-group input {
  width: 100%;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 10px 14px;
  font-family: inherit;
  font-size: 14px;
  border-radius: 6px;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 28px;
}

.btn-cancel, .btn-save {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 10px 28px;
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  border-radius: 6px;
}

.btn-save {
  background: var(--accent);
  color: #fff;
  border: none;
}

.server-list {
  max-height: 420px;
  overflow-y: auto;
}

.server-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  margin-bottom: 10px;
  border-radius: 8px;
}

.server-info strong {
  display: block;
  margin-bottom: 4px;
}

.server-info span {
  color: var(--text-muted);
  font-size: 12px;
}

.server-actions {
  display: flex;
  gap: 8px;
}

.server-actions button {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 8px 14px;
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  border-radius: 6px;
}

.server-actions button:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.btn-danger {
  color: var(--error) !important;
  border-color: var(--error) !important;
}

.no-servers {
  text-align: center;
  color: var(--text-muted);
  padding: 40px;
}