.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.72rem 1.4rem;
    font-size: var(--fs-sm);
    font-weight: var(--weight-semibold);
    line-height: 1;
    border: 1px solid transparent;
    border-radius: var(--radius-pill);
    cursor: pointer;
    white-space: nowrap;
    transition: background-color var(--transition), border-color var(--transition),
        color var(--transition), transform var(--transition);
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-on-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-strong);
    color: var(--color-on-primary);
}

.btn-accent {
    background-color: var(--color-primary);
    color: var(--color-on-primary);
}

.btn-accent:hover {
    background-color: var(--color-primary-strong);
    color: var(--color-on-primary);
}

.btn-secondary {
    background-color: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border-strong);
}

.btn-secondary:hover {
    background-color: var(--color-surface-2);
    color: var(--color-text);
}

.btn-muted {
    background-color: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-text-soft);
}

.btn-muted:hover {
    background-color: var(--fill-2);
    color: var(--color-text);
    border-color: var(--color-text);
}

.btn-ghost {
    background-color: transparent;
    color: var(--color-text-soft);
}

.btn-ghost:hover {
    background-color: var(--color-surface);
    color: var(--color-text);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-primary-strong);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary-soft);
}

.btn-dark {
    background-color: var(--color-ink);
    color: var(--color-on-ink);
    border-color: var(--color-ink);
}

.btn-dark:hover {
    background-color: #000000;
    color: var(--color-on-ink);
}

.btn-on-ink {
    background-color: var(--color-on-ink);
    color: var(--color-ink);
}

.btn-on-ink:hover {
    background-color: #ffffff;
    color: var(--color-ink);
}

.btn-ghost-ink {
    background-color: transparent;
    color: var(--color-on-ink);
    border-color: var(--color-on-ink-border);
}

.btn-ghost-ink:hover {
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--color-on-ink);
}

.btn-danger {
    background-color: var(--color-danger);
    color: #ffffff;
}

.btn-danger:hover {
    filter: brightness(0.94);
}

.btn-mute {
    background-color: transparent;
    color: var(--color-muted);
}

.btn-mute:hover {
    background-color: var(--color-danger-soft);
    color: var(--color-danger);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: var(--fs-xs);
}

.btn-lg {
    padding: 0.95rem 1.8rem;
    font-size: var(--fs-base);
}

.btn-icon {
    padding: 0.6rem;
    width: 2.6rem;
    height: 2.6rem;
    border-radius: var(--radius-md);
}

.btn[disabled] {
    opacity: 0.55;
    cursor: not-allowed;
}

@media (max-width: 640px) {
    .btn {
        padding: 0.58rem 1.05rem;
        font-size: var(--fs-xs);
    }
    .btn-lg {
        padding: 0.72rem 1.3rem;
        font-size: var(--fs-sm);
    }
}

.btn-on-accent {
    background: var(--color-mint);
    color: #003138;
    border: 1px solid var(--color-mint);
}

.btn-on-accent:hover {
    background: var(--color-mint-strong);
    border-color: var(--color-mint-strong);
    color: #003138;
}

.btn-ghost-accent {
    background: transparent;
    color: var(--color-on-primary);
    border: 1px solid color-mix(in srgb, var(--color-on-primary) 45%, transparent);
}

.btn-ghost-accent:hover {
    border-color: var(--color-on-primary);
    background: color-mix(in srgb, var(--color-on-primary) 14%, transparent);
}