def fmt_large(value) -> str:
    """Format a number in billions/millions with suffix."""
    try:
        v = float(value)
    except (TypeError, ValueError):
        return "N/A"
    if abs(v) >= 1e12:
        return f"${v / 1e12:.2f}T"
    if abs(v) >= 1e9:
        return f"${v / 1e9:.2f}B"
    if abs(v) >= 1e6:
        return f"${v / 1e6:.2f}M"
    return f"${v:,.0f}"


def fmt_currency(value) -> str:
    """Format a dollar amount with commas."""
    try:
        return f"${float(value):,.2f}"
    except (TypeError, ValueError):
        return "N/A"


def fmt_pct(value, decimals: int = 2) -> str:
    """Format a ratio as a percentage (0.12 → 12.00%)."""
    try:
        return f"{float(value) * 100:.{decimals}f}%"
    except (TypeError, ValueError):
        return "N/A"


def fmt_ratio(value, decimals: int = 2) -> str:
    """Format a plain ratio/multiple (e.g. P/E)."""
    try:
        return f"{float(value):.{decimals}f}x"
    except (TypeError, ValueError):
        return "N/A"


def fmt_number(value, decimals: int = 2) -> str:
    """Format a plain number."""
    try:
        return f"{float(value):,.{decimals}f}"
    except (TypeError, ValueError):
        return "N/A"


def delta_color(value) -> str:
    """Return 'normal', 'inverse' or 'off' for st.metric delta_color."""
    try:
        return "normal" if float(value) >= 0 else "inverse"
    except (TypeError, ValueError):
        return "off"