:root {
    --primary: #2563eb;
    --success: #16a34a;
    --bg: #f8fafc;
    --text: #1e293b;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding-bottom: 70px; /* Space for bottom nav */
}

.app-header {
    background: white;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.card {
    background: white;
    margin: 15px;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}

.btn-app {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: white;
    padding: 15px;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    margin: 10px 0;
    border: none;
    width: 100%;
}

/* Bottom App Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    width: 100%;
    background: white;
    display: flex;
    justify-content: space-around;
    padding: 12px 0;
    border-top: 1px solid #e2e8f0;
    z-index: 1000;
}

.nav-item {
    text-align: center;
    color: #64748b;
    text-decoration: none;
    font-size: 12px;
}

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