:root {
  --bg: #0f1117;
  --bg-elevated: #171923;
  --bg-hover: #1f2330;
  --border: #2a2f3d;
  --text: #e8eaed;
  --text-muted: #9aa0a6;
  --accent: #6c9eff;
  --accent-hover: #8ab4ff;
  --danger: #f28b82;
  --success: #81c995;
  --user-bg: #1a3a5c;
  --assistant-bg: #1e2130;
  --radius: 8px;
  --font: "Segoe UI", system-ui, sans-serif;
}

* {
  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;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

.hidden {
  display: none !important;
}

.btn-primary {
  background: var(--accent);
  color: #0f1117;
  border: none;
  border-radius: var(--radius);
  padding: 8px 16px;
  font-weight: 600;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--bg-hover);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 12px;
  width: 100%;
}

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

.btn-icon {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

.btn-danger {
  background: transparent;
  border: 1px solid var(--danger);
  color: var(--danger);
  border-radius: var(--radius);
  padding: 4px 10px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
}

.field > span, .field > legend {
  color: var(--text-muted);
  font-size: 12px;
}

.field input, .field select, .field textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px;
  resize: vertical;
}

.field-error {
  color: var(--danger);
  font-size: 12px;
}

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  max-width: 360px;
  z-index: 1000;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.toast.error {
  border-color: var(--danger);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
}

.modal-content {
  position: relative;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: min(640px, 92vw);
  max-height: 85vh;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 {
  margin: 0;
}

.modal-body {
  padding: 16px;
  overflow-y: auto;
}

.list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.list-item {
  padding: 8px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  border: 1px solid transparent;
}

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

.list-item.active {
  background: var(--bg-hover);
  border-color: var(--accent);
}

.form-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.form-row input, .form-row select, .form-row textarea {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px;
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  margin-bottom: 8px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.card-title {
  font-weight: 600;
}

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