:root {
  --bg: #0f1117;
  --bg-elevated: #1a1d27;
  --border: #2a2e3a;
  --text: #e8e9ed;
  --text-muted: #9799a6;
  --accent: #7c6cf0;
  --accent-hover: #9384ff;
  --danger: #f0575c;
  --success: #4dd68a;
  --radius: 10px;
  --max-width: 860px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Arial, "Noto Sans Hebrew", sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 14px 20px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.logo {
  font-size: 1.2rem;
  font-weight: 700;
}

.main-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.nav-btn {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 8px 14px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.nav-btn:hover {
  background: var(--border);
  color: var(--text);
}

.nav-btn.active {
  background: var(--accent);
  color: #fff;
}

#app-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 16px 60px;
}

.screen {
  display: none;
}

.screen.active {
  display: block;
}

h2 {
  margin-top: 0;
}

#toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  left: 20px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  pointer-events: none;
  z-index: 100;
}

@media (max-width: 600px) {
  .app-header {
    flex-direction: column;
    align-items: stretch;
  }
  .main-nav {
    justify-content: space-between;
  }
  .nav-btn {
    flex: 1;
    text-align: center;
    padding: 8px 4px;
    font-size: 0.85rem;
  }
}