:root {
  --primary: #0f766e;
  --primary-dark: #115e59;
  --accent: #f59e0b;
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --success: #16a34a;
  --warning: #ea580c;
  --danger: #dc2626;
  --border: #e2e8f0;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  padding-bottom: 70px;
}

.app-header {
  background-color: var(--primary);
  color: white;
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-title {
  font-size: 1.125rem;
  font-weight: 700;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-online {
  background-color: rgba(255, 255, 255, 0.2);
  color: #d1fae5;
}

.badge-offline {
  background-color: #fee2e2;
  color: #991b1b;
}

.badge-syncing {
  background-color: #fef3c7;
  color: #92400e;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
}

.update-banner {
  background-color: var(--accent);
  color: #78350f;
  padding: 8px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  font-weight: 500;
}

.update-banner.hidden {
  display: none;
}

.container {
  padding: 16px;
  max-width: 600px;
  margin: 0 auto;
}

.welcome-card {
  background: var(--bg-card);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 50;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.nav-item.active {
  color: var(--primary);
  font-weight: 600;
}

.nav-icon {
  font-size: 1.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 600;
  border: none;
  cursor: pointer;
}

.btn-sm {
  padding: 4px 10px;
  font-size: 0.75rem;
}

.btn-light {
  background: white;
  color: var(--text-main);
}