:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface-hover: #243044;
  --border: #2d3a4d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --primary: #58a6ff;
  --primary-hover: #79b8ff;
  --danger: #f85149;
  --danger-hover: #ff7b72;
  --success: #3fb950;
  --radius: 8px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Mono", "Source Code Pro", Menlo, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

#app {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.header h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
}

/* Views */
.view {
  display: block;
}

.view.hidden {
  display: none;
}

.toolbar {
  margin-bottom: 1rem;
}

.btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

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

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

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

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 13px;
}

.error-banner {
  padding: 0.75rem 1rem;
  background: rgba(248, 81, 73, 0.15);
  border: 1px solid var(--danger);
  border-radius: var(--radius);
  color: var(--danger);
  margin-bottom: 1rem;
}

.error-banner.hidden,
.info-banner.hidden,
.loading.hidden,
.empty-state.hidden {
  display: none;
}

.info-banner {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.info-banner-success {
  background: rgba(63, 185, 80, 0.15);
  border: 1px solid var(--success);
  color: var(--success);
}

.info-banner-error {
  background: rgba(248, 81, 73, 0.15);
  border: 1px solid var(--danger);
  color: var(--danger);
}

.loading,
.empty-state {
  color: var(--text-muted);
  padding: 1.5rem;
}

.instance-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.instance-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: background 0.15s;
}

.instance-card:hover {
  background: var(--surface-hover);
}

.instance-card-info {
  flex: 1;
  min-width: 0;
}

.instance-card-id {
  font-weight: 600;
  font-family: var(--font-mono);
  margin-bottom: 0.25rem;
}

.instance-card-meta {
  font-size: 13px;
  color: var(--text-muted);
}

.instance-card-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  font-size: 12px;
  border-radius: 4px;
  font-weight: 500;
}

.badge.ready {
  background: rgba(63, 185, 80, 0.2);
  color: var(--success);
}

.badge.provisioning,
.badge.destroying {
  background: rgba(88, 166, 255, 0.2);
  color: var(--primary);
}

.badge.failed {
  background: rgba(248, 81, 73, 0.2);
  color: var(--danger);
}

/* Instance detail / chat */
.instance-header {
  margin-bottom: 1rem;
}

.back-link {
  display: inline-block;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  margin-bottom: 0.5rem;
}

.back-link:hover {
  color: var(--primary);
}

.instance-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.instance-meta h2 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  font-family: var(--font-mono);
}

.instance-link {
  color: var(--primary);
  text-decoration: none;
  font-size: 13px;
}

.instance-link:hover {
  text-decoration: underline;
}

.chat-panel {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 220px);
  min-height: 320px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.chat-msg {
  max-width: 100%;
}

.chat-msg.user .chat-msg-body {
  background: var(--surface-hover);
  border: 1px solid var(--border);
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  white-space: pre-wrap;
  word-break: break-word;
}

.chat-msg.assistant .chat-msg-body {
  padding: 0;
}

.chat-msg-body h1, .chat-msg-body h2, .chat-msg-body h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.chat-msg-body p {
  margin: 0 0 0.5rem;
}

.chat-msg-body p:last-child {
  margin-bottom: 0;
}

.chat-msg-body code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg);
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
}

.chat-msg-body pre {
  margin: 0.5rem 0;
  padding: 1rem;
  background: var(--bg);
  border-radius: var(--radius);
  overflow-x: auto;
}

.chat-msg-body pre code {
  padding: 0;
  background: none;
}

.chat-msg-body ul, .chat-msg-body ol {
  margin: 0.5rem 0;
  padding-left: 1.25rem;
}

.chat-msg-loading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  padding: 0.75rem 0;
}

.chat-msg-loading .spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.chat-msg-error {
  color: var(--danger);
  padding: 0.75rem 0;
}

.chat-input-wrap {
  display: flex;
  gap: 0.5rem;
  padding: 1rem;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.chat-input-wrap textarea {
  flex: 1;
  min-height: 44px;
  max-height: 120px;
  padding: 0.6rem 0.75rem;
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  resize: none;
}

.chat-input-wrap textarea::placeholder {
  color: var(--text-muted);
}

.chat-input-wrap textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.chat-input-wrap .btn {
  align-self: flex-end;
}