:root {
  --bg: #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-hover: #eef2f6;
  --border: #e1e4e8;
  --text: #24292e;
  --text-secondary: #586069;
  --text-muted: #959da5;
  --accent: #0F4C8A;
  --accent-hover: #0a3a6b;
  --unread: #d73a49;
  --success: #28a745;
  --warning: #ffd33d;
  --danger: #d73a49;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.05);

  --status-new: #6f42c1;
  --status-in-progress: #f66a0a;
  --status-done: #28a745;

  --bubble-in: #f6f8fa;
  --bubble-out: #d8e9ff;

  --radius: 10px;
  --radius-sm: 6px;

  --header-h: 56px;
  --sidebar-w: 360px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
          Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.4;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: transparent;
  color: inherit;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.loader,
.empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  font-size: 14px;
}