:root {
    --brand: rgba(0, 102, 204, 1);
    --brand-dark: rgba(0, 82, 164, 1); /* azul mais escuro para contraste */
    --safe-bottom: env(safe-area-inset-bottom);
    --text: #0f172a;
    --border: #e5e7eb;
}

html, body {
    background: #fff;
    color: var(--text);
}

.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: #fff;
    border-bottom: 1px solid var(--border);
}

.bottom-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 100;
    background: #fff;
    border-top: 1px solid var(--border);
    padding-bottom: max(12px, var(--safe-bottom));
}

.bottom-nav a {
    padding: 10px 0;
    font-size: .85rem;
    display: flex;
    flex-direction: column;
    gap: 4px;
    color: #334155;
    text-decoration: none;
}

.bottom-nav a.active {
    color: var(--brand);
}

main {
    padding-bottom: 80px; /* espaço para a bottom-nav */
}