:root {
  --bg-main: #f8f9fa;
  --bg-card: #ffffff;
  --text-main: #212529;
  --text-muted: #6c757d;
  --border-color: #e9ecef;
  --accent-green: #02c076;
  --accent-red: #f84960;
  --accent-primary: #007bff;
  --nav-bg: #ffffff;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  padding-bottom: 60px; /* Space for bottom nav */
}

a {
  text-decoration: none;
  color: inherit;
}

/* Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
}

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--nav-bg);
  display: flex;
  justify-content: space-around;
  padding: 15px 0;
  border-top: 1px solid var(--border-color);
  z-index: 1000;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

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

.btn {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 14px 20px;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  width: 100%;
  font-weight: 500;
  color: var(--text-main);
}
.btn-primary {
  background-color: var(--text-main);
  color: #fff;
  border: none;
}