html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  height: 100%;
  overflow-x: hidden;
}

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

.screen {
  flex: 1;
  display: none;
  flex-direction: column;
  padding: 16px;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
}

.screen.active {
  display: flex;
}

.app-header {
  background: var(--header-bg);
  color: var(--header-text);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
}

.app-header h1 {
  font-size: 18px;
  margin: 0;
  font-weight: 600;
}

.header-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.header-icon-btn {
  background: rgba(255,255,255,0.12);
  border: none;
  color: white;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
}

.top-bar {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 24px;
}

@media (min-width: 640px) {
  .screen {
    padding: 24px 32px;
  }
}

.back-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}